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BECHTEL CHILE LTDA

BECHTEL CHILE LTDA.

PROCESS DESIGN CRITERIA

25414-138-3DR-V01L-00002FOR

MOLY PLANTPROYECTO DESARROLLO LOS BRONCES

ANGLO AMERICAN CHILEDLB-CRT-4520-FS-2002

021-Dec-07Issued for ConstructionMTAWBMTA

REVDATEREASON FOR REVISIONBYCHECKEGSPECLIENT

JOB No. 25414

DESIGN CRITERIA No.25414-138-3DR-V01L-00002

Page 1 of 32REV.

0

TABLE OF CONTENTS31.0GENERAL

31.1Introduction

31.2Source Codes

31.3Definition of Design Value Terms

52.0PROCESS SUMMARY

52.1Project Description

52.2Process Description

83.0MEASUREMENT UNITS AND SYMBOLS

114.0SITE DATA

115.0ENVIRONMENTAL CRITERIA

126.0DESIGN CRITERIA REFERENCE DOCUMENTS

137.0PRODUCTION SUMMARY

138.0CHARACTERISTICS OF PROCESS MATERIALS

149.0FLOTATION CIRCUIT

1810.0MOLY CONCENTRATE DEWATERING

2011.0STORAGE AND LOADOUT

2212.0REAGENTS

2813.0ADDENDUM: MASS BALANCE

1.0 GENERAL1.1Introduction

The following design criteria are for the engineering, design and specification of the process requirements for the Los Bronces Molybdenum Plant and encompass the following operations:

Concentrate Storage

Moly Flotation

Moly Concentrate Thickening, Filtration and Drying

Moly Concentrate Storage and Loadout

Reagent Storage and Distribution

Anglo American Chile Limited has commissioned Bechtel to complete detail engineering for 87_000 tons per day new concentrator facilities to be operated in conjunction with the existing Los Bronces operation. The new Molybdenum plant, located at Las Trtolas Concentrator, will process 2 330 tons per day of Cu-Mo concentrate.

1.2Source Codes

The sources code letters listed for each criterion refer to the origin of that criterion value. Where an integer is entered with a source code letter, this code number refers to specific source documents that are referenced in Section 6. In certain cases, two source codes may be referenced. The following letter code designators are used:

CodeDescription

A

B

C

D

E

F

G

H

ICriteria provided by AAStandard industry practice

Bechtel recommendation

Vendor-originated criteria

Criterion from process calculations

Engineering handbook data

Assumed data

Criteria provided by Technology Supplier

Metallurgical test results

1.3Definition of Design Value Terms

The process criteria are listed as Flowsheet BALANCE and/or DESIGN. The context in which these terms are used is in accordance with the following definitions:

Annual Rate:Flow rate per 365 calendar days.

Operating Days:The number of plant operating days per year is 365 days.

Utilization:A utilization factor of unity represents the capability of, and requirement for, any equipment or facility being on-line for 24 hours per day for all operating days in the year. A utilization of less than unity reflects the combined effect of allowed availability for that facility and the utilization effect from the on-line time of upstream or downstream equipment, or from other factors.

Flowsheet Balance:The values in the Flowsheet Balance column (generally flow rate) that represent the steady-state average rate during the design utilization time per operating day for any facility or equipment. Thus,

Annual Rate=Flowsheet Balance daily rate

x n of operating days per year

=Flowsheet Balance hourly rate

x 24 hour

x plant utilization factor

x n of operating days per year

Where criteria flow values are for time units of less than one hour, they are intended to represent the equivalent of continuous hourly rates in the relationship above.

In accordance with this definition, all Flowsheet Balance flow rates, together with the respective utilization factors, should be consistent with a single annual mass balance.

Balance throughput of the Moly Plant is based on a daily treatment of 2 330 tons of bulk Cu-Mo concentrate. Head grade, concentrate grade and recovery are the arithmetic average for the years 2012 through 2016 on the basis of the production plan developed for the LOM1-2007 (20/04/07 version).Design Value:The criteria values in this column provide the instantaneous process criterion values that take account of flows that operate for less than 24 hours during one operating day, or where it is intended that the particular equipment will have an additional capacity to allow for maintenance, catch-up capability or for variability in process parameters. The Design values are intended as attainable continuous rates and do not include any additional design allowance(s), by engineer or vendor, to ensure attainment. The combinations of Design values neither relate to the annual productions defined nor integrate to represent a metallurgical balance. The Design values are individual rates used for sizing equipment.

Moly flotation and thickening are designed to operate on a continuous basis 365 days per year with a utilization of 95 percent. Moly drying is designed to operate on a continuous basis 365 days per year with a utilization of 50 percent.

In general, the following factors will be applied for equipment sizing unless specified otherwise:

From moly feed storage tank, rougher cells and moly plant final tailings (final Cu concentrate) lines the design flow will be 130 percent of the balance flow (balance flow x 1.30) on a mass basis.

From rougher concentrate through cleaner circuits, moly concentrate thickening and drying, the design flow will be 160 percent of the balance flow (balance flow x 1.60) on a mass basis.

For water lines the design flow will be 200 percent of the balance flow (balance flow x 2.0).

A froth factor is applied to the design flow volumes as stated in flow diagrams, material balance, and equipment specifications, and affects the sizing of volume components such as pump casings and impellers, sumps, and suction piping. Generally, a froth factor (FF) of 2.0 to 5.0, as indicated in the design criteria, is used for concentrate streams. For tailings streams a froth factor of 2.0 will be applied. Froth factor will be used as design flow x FF where applies.Pump motor power requirements are based on maximum mass flow rates as indicated on the process flow diagrams.

2.0 PROCESS SUMMARY

2.1Project Description

Currently, a 61 000 tons per day copper concentrator is operating at Los Bronces. As part of the Los Bronces Development Project, Minera Sur Andes will build a new concentrator to process 87 000 tons per day of ore. This new concentrator will be operating in conjunction with the existing Los Bronces operation. All of the supporting facilities will be modified or upgraded as required.

2.2Process Description

A molybdenum product will be separated from the bulk (Cu-Mo) concentrate as part of the concentrator process. The molybdenum processing includes the drying and packaging of the final moly concentrate for transportation by truck.

Copper-molybdenum concentrate at approximately 60 percent solids from the new concentrator will be delivered into a new 200 m3 agitated concentrate storage tank which will provide surge capacity to smooth the feed rate and adjust for grade fluctuations prior to feeding the process facilities. Normally, the new storage tank will feed Cu-Mo concentrate to the moly flotation plant and eventually will feed to the copper concentrate filter plant. In this storage tank the pulp will be conditioned with diesel and sulfuric acid. The Cu-Mo concentrate from the storage tank will be diluted to approximately 44 percent solids with water and subjected to selective flotation in one row of twelve 14 m3 (500 ft3) conventional flotation sealed cells (roughers). In this circuit, copper minerals will be depressed with sodium hydrosulfide while diesel oil will be used to collect and float the molybdenum sulfide. The rougher tailings, which contain the majority of the copper and iron sulfide minerals, will be pumped to the copper concentrate thickeners for dewatering.

Moly concentrate from the rougher cells will be cleaned in three 8.5 m3 (300 ft3) first cleaner cells and two 8.5 m3 (300 ft3) second cleaner cell for upgrading. Tailings from the first cleaners will be recycled to the rougher cells and tailings from the second cleaners will be recycled to the first cleaners. The second cleaner concentrate will be pumped to a 200 m3 storage tank and then feed one 2.2 m diameter cleaner column cell (3rd cleaner), where a final concentrate containing 50.5 percent molybdenum will be produced. The final concentrate feed to a 12 m diameter thickener for dewatering. The final molybdenum concentrate will be dewatered further in a disc filter and a dryer. Final molybdenum concentrate will be stored in a 12 ton surge bin prior to packaging in bags for transportation.

Reagents

Reagent storage and distribution areas will be provided for the four reagents required in the molybdenum flotation circuits: sulfuric acid, sodium hydrosulfide (NaHS), diesel oil and P-4000 or similar.

Diesel oil will be unloaded by a pump from 19 000 liter tank trucks and transferred to a 40 m3 storage tank equipped with flame arrester. The diesel oil will be pumping in a loop circuit by two (one operating and one standby) 7 m3/h pumps, to feed three 10-150 cm3/min (two operating and one standby) metering pumps which fed diesel oil to the rougher feed conditioner tank and to the third cleaner feed tank; the loop will feed also the drying system and the P-4000 storage tank for dilution.

Aqueous sodium hydrosulfide (30 to 42% NaHS by weight) will be delivered in 19 000 liter tank trucks. The aqueous sodium hydrosulfide will be unloaded by a pump and transferred to two 400 m3 storage tanks. While the tank truck is being emptied, it will be vented through a vapor capturization system to the storage tank vent which is then vented through a second vapor capturization system before being released to the atmosphere. The aqueous sodium hydrosulfide will be pumped to a daily consumption tank, via a loop and a separate mixing line, by two (one operating and one standby) 10 m3/h pumps. Aqueous sodium hydrosulfide will be fed from 21 m3 capacity daily tank by two 0.6 1.5 m3/h metering pump to the rougher feed box, and by seven 0.1 0.4 m3/h metering pumps (five operating and one standby) to rougher cells transfer box, 1st cleaner and 2nd cleaner cells feed box, and third cleaner feed box.

Sulfuric acid (98 % H2SO4) will be delivered in 12 000 liter tank trucks to a 70 m3 storage tank, then it will transferred to a 6 m3 capacity daily tank by two 5 m3/h pumps (one operating and one standby). Sulfuric acid will be fed from the daily consumption tank by two 0.9 3.0 L/min metering pumps to the rougher feed conditioner tank (one operating and one standby) and by four 0.2 0.6 L/min metering pumps to rougher, first cleaner and second cleaner feed box (three operating and one standby).

Glycol (P-4000 or similar) will be delivered in 204 L drums. The glycol will be pumped to a 12 m3 storage tank. Glycol will be mixtured with diesel at 10% solution by utilizing a mixing line and a 5 m3/h recirculating pump, which also feed a 5 m3 day tank. Glycol/diesel is fed to the moly plant flotation circuits for froth control by five 15 - 150 cm3/min metering pumps (including one standby).

Table no. 2.1

Summary of Design Criteria

UnitValue

Production Summary

Feed rate

Mo content

Moly recovery

Moly concentrate production

Concentrate gradet/d

%

%

t/d

%2 330

0.45

90

19

50.5

Rougher Flotation

Machine size

Machine type

Number of rows

Cells per rowm3no.

no.14.2

Enclosed

1

12

1st Cleaner Flotation

Machine size

Machine type

Number of rows

Cells per rowm3no.

no.8.5

Enclosed

1

3

2nd Cleaner Flotation

Machine size

Machine type

Number of rows

Cells per rowm3no.

no.8.5

Enclosed

1

2

3rd Cleaner Flotation

Machine size

Machine type

Number of cellsno.2.4m x 12m HEnclosed

1

Moly Concentrate Thickener Type

Thickener diameter

Quantitym

no.Conventional

12

1

Moly Concentrate Dryer

Type

Capacity

Quantityt/h

no.Oleo-electrical

3.0

1

3.0 MEASUREMENT UNITS AND SYMBOLS

The Metric System of measurement used in this process design criteria is in accordance with Bureau International des Poids et Mesures. A period, not comma, is used as the decimal marker. A small space (with no comma) is used to separate groups of three integers.

The reference conditions for gas volume are 0 C and 101.325 kPa, corresponding with a molar (ideal) gas volume of 22 414 m3/(kg(mol). This is shown as m3 (normal) or abbreviated to (non SI) Nm3. The unit t rather than Mg, is used for 1 000 kg mass.

SI Base Units: (dimensionally independent)

Measured AttributeUnitSymbol

Lengthmetrem

Masskilogramkg

Timeseconds

Electric currentampereA

Thermodynamic temperatureKelvinK

Amount of substancemolemol

Luminous intensitycandelacd

Permitted Base Units:

Measured AttributeUnitSymbolDefinitionTimeminutemin60 s

hourh60 min

dayd24 h

(calendar) yeary365 d

Massmetric tont1 000 kg

(Note: SI prefixes, as listed below, are used only with SI base units. It is incorrect to use these prefixes with the permitted base units.)

SI Prefixes: (selected list only)

Multiplication FactorPrefixSymbol

1012teraT

109gigaG

106megaM

103kilok

102hectorh

10dekada

Multiplication FactorPrefixSymbol

10-1decid

10-2centic

10-3millim

10-6micro

10-9nanon

10-12picop

The prefixes and prefix symbols are used with the SI base units and derived units - with the exception of kg. The base mass unit, kg, already has a prefix, and the SI prefixes are then applied to the unit gram (g). In this manner, the symbol for metric ton is Mg, however in this criteria the permitted alternate, t as listed above, is used. The ASTM permitted form Wh is used rather than W(h.

Derived SI Units of Special Name:

Measured AttributeUnitSymbolFormulaFrequency (periodic)hertzHz1/s

ForcenewtonNkg(m/s2Pressure, stresspascalPaN/m2Energy, work, heat qty.jouleJN(m

Power, radiant fluxwattWJ/s

Qty. of electricitycoulombCA(s

Electric potential, emfvoltVW/A

Electric capacitancefaradFC/V

Electric resistanceohm(V/A

Electric conductancesiemensSA/V

Magnetic fluxweberWbV(s

Magnetic flux densityteslaTWb/m2InductancehenryHWb/A

Celsius temperaturedegree CelsiusCK-273.15

Plane angleradianraddimensionless

Solid anglesteradiansrdimensionless

Luminous fluxlumenlmcd(sr

Illuminenceluxlxlm/m2Activity (of a radionuclide)becquerelBq1/s

Absorbed dosegrayGyJ/kg

Dose equivalentsievertSvJ/kg

Units in Use:

Measured AttributeUnitSymbolDefinitionPlane angle raddegree1 = (/180)

minute'1' = (1/60)

second"1" = (1/60)'

VolumelitreL1 L = 10-3 m3Areahectareha1 ha = 104 m2Energy (electrical)kilowatt-hourkWh1 kWh = 3.6MJ

Some Common Derived Units:

Measured AttributeUnitSymbolAccelerationmetre per second squaredm/s2Angular accelerationradian per second squaredrad/s2Angular velocityradian per secondrad/s

Areasquare metrem2Concentrationmol per cubic metremol/m3Current densityampere per square metreA/m2Density (mass)kilogram per cubic metrekg/m3Electric flux densitycoulomb per square metreC/m2Entropyjoule per KelvinJ/K

Heat capacityjoule per KelvinJ/K

Heat flux densitywatt per square metreW/m2Luminancecandela per square metrecd/m2Magnetic field strengthampere per metreA/m

Molar energyjoule per moleJ/mol

Molar entropyjoule per mole KelvinJ/(mol(K)

Molar heat capacityjoule per mole KelvinJ/(mol(K)

Moment of forcenewton metreN(m

Permeability (magnetic)henry per metreH/m

Power densitywatt per square metreW/m2Specific heat capacityjoule per kilogram KelvinJ/(kg(K)

Specific energyjoule per kilogramJ/kg

Specific entropyjoule per kilogram KelvinJ/(kg(K)

Specific volumecubic metre per kilogramm3/kg

Surface tensionnewton per metreN/m

Thermal conductivitywatt per metre KelvinW/(m(K)

Thermal conductancewatt per square metre KelvinW/(m2(K)

velocitymetre per secondm/s

viscosity, dynamicpascal secondPa(s

viscosity, kinematicsquare metre per secondm2/s

volumecubic metrem3Abbreviations of Other Terms:

TermAbbreviationalternating currentac

barrelbbl

boiling pointbp

cosinecos

cotangentcot

decibeldB

diameterdia

direct currentdc

electromotive forceemf

induced draftID

inside diameteri.dia

maximummaxm

minimumminm

mole percentmol %

molecular mass (weight)mol wt

parts per billionppb

parts per millionppm

parts per million by volumeppmv

parts per million by mass (weight)ppmw

power factorPF

revolutions per minuterpm

revolutions per secondrps

root mean squarerms

sinesin

specific gravitySp Gr

tangenttan

temperaturetemp

ultra high frequencyUHF

very high frequencyVHF

volumevol

volume percentvol %

weight (mass)wt

weight (mass) percentwt %

4.0 SITE DATA

Refer to document Condiciones de Planta for general site conditions, Bechtel document N 25414-138-3DR-G01L-00001.

5.0 ENVIRONMENTAL CRITERIA

Refer to document Criterios de Diseo Medio Ambiente for general environmental criteria, Bechtel document N 25414-138-3DR-H01L-00001.

The Molybdenum Plant will be designed as a zero discharge facility with all discard reporting to the evaporation ponds. The tailings from the moly rougher flotation cells will be the final copper concentrate and will flow to thickeners. The thickener overflows will be returned to the process facilities or discarded. Process and reagent spills will be contained in detention areas.

6.0 DESIGN CRITERIA REFERENCE DOCUMENTS

The following major documents were used to prepare the design criteria for the Los Bronces Molybdenum Plant.

6.1 Process Design Criteria, Intermediate Expansion Option, Minmetal, August 2nd 2005, Rev. P.6.2 Process Design Criteria for Molybdenum Plant, Basic Engineering, Bechtel, June 2007, Rev. T.6.3 Plan de Produccin de largo plazo LOM1 2007 (20/04/07 version).

7.0 PRODUCTION SUMMARY

7.1Metallurgical SummaryE,A6.3MolybdenumTonnageCopperMolybdenum

Plantt/h% wt% Cu%Cu Dist.% Mo%Mo Dist.

Cu-Mo Concentrate102.2100.027.5100.00.45100.0

Copper Concentrate101.499.227.799.930.0510.0

Moly Concentrate0.80.82.50.0750.590.0

Refer to the material balance spreadsheet for additional data on flowrates and recoveries for each process unit operation. A copy of the material balance is included in Section 13.0, Addendum Mass Balance, of this document.UnitsBalanceDesignCode

7.2Operating Schedule

Operating days per yeard365365A6.1

Operating hours per dayh2424A6.1

Plant utilization

Flotation and Thickening

Drying%%95

5095

50CE

8.0 CHARACTERISTICS OF PROCESS MATERIALS

8.1Plant Feed (Cu-Mo Concentrate)Throughputt/d2 330A6.3

t/h102133E

Assay

Cu

Mo%

%27.50.4527.50.45A6.3A6.3

Solid specific gravitySp.Gr.4.24.2B

Cu-Mo thickener underflow% wt6060B

8.2Moly Concentrate

Throughputt/d19A6.3

t/h0.81.3E

Assay

Cu

Mo%

%2.5

50.52.5

50.5A6.3A6.3

Solid specific gravitySp.Gr.4.54.5B

Final Moisturewt %44B

9.0 FLOTATION CIRCUIT9.1 Conditioning9.1.1 Moly Plant Feed (Cu-Mo concentrate thickener discharge)Feed ratet/h102133E

Solids specific gravitySp Gr4.24.2B

Pulp percent solidswt %6060B

Pulp flow ratem3/h92120E

Pulp specific gravitySp Gr1.841.84E

Pulp pH10.510 -11B

9.1.2 Storage Tank

TypeOpen, agitated, pump dischargeA6.2

Number of tanksno.1C

Capacity (net)m3200E

Tank size (dia x height)m6.6 x 6.6E

Retention time (based on 60% solids)h2C

Live Storage, range%35 to 93B

Pulp pH at discharge7.57.0 7.5A6.2

9.2 Rougher Flotation9.2.1Rougher Flotation FeedRougher feed ratet/h108140E

Solids specific gravitySp Gr4.24.2E

Pulp percent solidswt %3938 40B


Pulp pH7.57.0 7.5A6.2

Froth factor2.0B

9.2.2 Rougher Flotation Time and Machine Size

Flotation timemin3430A6.1

Effective cell volume factor%85B

Rougher cellsno.1212E

TypeCovered conventionalA6.2

Sizem3ft314

500A6.2A6.2

Arrangement1 row of 12 cells; 3 3 3 3E

ORPmV-400 to -550A6.2

9.2.3 Rougher ConcentrateMo content in concentrate%10.010.0A6.1

Mo recovery%93.493.4A6.1

Rougher concentrate flow ratet/h711E

Solids specific gravitySp Gr4.24.2A6.1

Concentrate density (at cell lip), solidswt %2020B

Diluted concentrate density, solidswt %1515B

Diluted concentrate pulp flow ratem3/h3962E

Froth factor5.0B

9.2.4 Rougher Tailings (Final Copper Concentrate)

Mo content%0.050.05A6.3

Cu content%27.727.7A6.3

Solids flow ratet/h101132E


Pulp percent solidswt %41.639 42B


Pulp pH8.58.0 9.0A6.2

Froth factor2.0B

9.3 1st Cleaner Flotation9.3.11st Cleaner Flotation Feed1st cleaner feed ratet/h1015E


Pulp percent solidswt %1515E


Pulp pH7.57.0 7.5A6.2

Froth factor3.0B

9.3.2 1st Cleaner Flotation Time and Machine Size



1ST Cleaner cellsno.33E


Sizem3ft38.5

300A6.2A6.2

Arrangement1 row of 3cells; 3E

9.3.3 1st Cleaner Concentrate

Mo content in concentrate%25.025.0A6.1

Mo recovery%8080A6.1

1st cleaner concentrate flow ratet/h46E





Froth factor5.0B

9.3.4 1st Cleaner Tailings

Mo content%4.24.2E





Pulp pH7.57.0 8.0A6.2

Froth factor2.0B

9.4 2nd Cleaner Flotation9.4.12nd Cleaner Flotation Feed2nd cleaner feed ratet/h610E




Pulp pH7.57.0 7.5A6.2

Froth factor3.0B

9.4.2 2nd Cleaner Flotation Time and Machine Size



1ST Cleaner cellsno.22E


Sizem3ft38.5

300A6.2

A6.2

Arrangement1 row of 2 cells; 2E

9.4.3 2nd Cleaner Concentrate

Mo content in concentrate%4040A6.1

Mo recovery%7070A6.1

2nd cleaner concentrate flow ratet/h3.15.0E


Concentrate density (at cell lip), solidswt %1915 19B

Diluted concentrate density, solidswt %1712 17B


Froth factor5.0B

9.4.4 2nd Cleaner Tailings

Mo content%1818E


Solids specific gravitySp Gr4.44.35 4.4E



Pulp pH7.57.0 8.0A6.2

Froth factor2.0B

9.5 Intermediate Concentrate Storage9.5.1 Storage Feed

Feed ratet/h3.15.0E





Pulp pH7.57.0 8.0A6.2

9.5.2 Storage Tank

TypeClosed, agitated, pump dischargeA6.2


Capacity (net)m3200A6.2


Retention time (based on 60% solids)h9E


Pulp pH at discharge7.57.0 8.0A6.2

Froth factor1.2E

9.6 3rd Cleaner Flotation9.6.1 3rd Cleaner Flotation Feed3rd cleaner feed ratet/h3.15.0A6.3




Pulp pH7.57.0 7.5A6.2

Froth factor3.0B

9.6.2 3rd Cleaner Cell

Superficial gas velocitycm/s1.1B

Carrying capacitytconc/h/m20.180.32A6.1

Mass loadingt/h/m20.72.7A6.2

Froth depthm0.6 0.7B

3rd Cleaner Cell

Type

Number

Size (dia)

AreaNo.m

m2Column

1

2.44.6A6.1BE

E

9.6.3 3rd Cleaner Concentrate

Mo content in concentrate%50.550.5A6.3

Mo recovery%33.233.2E

3rd cleaner concentrate flow ratet/h0.81.3A6.3




Diluted concentrate pulp flow ratem3/h6.310.0E

Froth factor5.0B

9.6.4 3rd Cleaner Tailings

Mo content%36.236.2E

Solids flow ratet/h2.33.7E

Solids specific gravitySp Gr4.374.35 4.4E



Pulp pH7.57.0 8.0A6.2

Froth factor2.0B

10.0 MOLY CONCENTRATE DEWATERING10.1 Moly Concentrate Thickener10.1.1 Thickener FeedSolids flow ratet/h0.81.3A6.3

t/d1930A6.3


Pulp percent solids()wt %10.910 12E

Pulp flow ratem3/h7.011.0E


Pulp pH7.57.0 8.0A6.2

10.1.2 Moly Concentrate Thickener

Number of thickenersno.1B

Unit settling aream2/t/d6.01.0A6.1

Spray waterm3/h1020B

Thickener

TypeConventionalB

Size (dia)m12E,A6.2

Aream2113E

10.1.3 Moly Concentrate Thickener Underflow

Underflow percent solidswt %5050 55B

Underflow flow ratem3/h1.01.6E

Underflow pulp specific gravitySp Gr1.641.64 1.75E

10.1.4 Moly Concentrate Thickener Overflow

Overflow flow ratem3/h610E

10.2 Moly Concentrate Storage10.2.1 Moly Concentrate Storage Feed

Solids feed ratet/h0.81.3A6.3



Pulp flow ratem3/h1.01.6E

Pulp specific gravitySp Gr1.641.64 1.75E

Pulp pH7.57.0 8.0A6.2

10.2.2 Moly Concentrate Storage Tank

TypeClosed, agitated, pump dischargeA6.2


Capacity (net)m317E


Retention time (based on 50% solids)d1.81.0A6.1


10.3 Moly Concentrate Filter10.3.1 Filter FeedSolids flow ratet/d1930A6.3



Pulp flow rate()m3/h2.13.4E

Pulp specific gravitySp Gr1.641.64 1.75E

Pulp pH7.57.0 8.0A6.2

10.3.2 Moly Concentrate Filter

TypeVacuum DiscA

Number of filtersNo.1E

Filter cake moisture%1515 20B,D

Filtering ratet/h/m20.11A6.1

Filter capacityt/h3.0A6.2

Filtration aream226E

Number of discsNo.6 D

Disc diameterm1.8 D,A6.2

10.3.3 Filtrate

Filtrate flow ratem3/h1.43.0E

11.0 STORAGE AND LOADOUT

11.1 Moly Concentrate Dryer11.1.1 Dryer Feed

Solids feed ratet/h1.72.8E

Feed moisture%1515 20B,D

Dryer feed bulk densityt/m31.8 - 2.0B

Feed temperatureC15 20B

11.1.2 Moly Concentrate Dryer

Discharge moisture%43 to 5B

Moly Dryer

Type

Number

Size (screw dia)No.InTwin screw

1

TBDA6.1BD

Product bulk density

Wet with 4% moisture loose

Dry

Wet with 4% moisture compactedt/m3t/m3t/m31.44

1.36

1.76B

B

B

Specific heatkcal/kg/C0.20F

11.2 Concentrate Storage and LoadoutFinal Mo concentrate Storage

TypeBin with discharge activatorB

Numberno.1B

Capacityt12E,A6.2

Bag filling system

Capacityt/h3E

Numberno.1B

Bag capacitykg1 000 1 500A6.2

Bag storage locationAdjacent to moly plant;

7 days production (250 t)C

12.0 REAGENTS

12.1Sodium Hydrosulfide (NaHS)12.1.1Material Characteristics

FormLiquid, 30 42% aqueous solution by weightD

Chemical formulaNaHSF

Specific gravity at 20 C1.286D

Viscosity

at 25C (42% solution)

at 37C (42% solution)cP

cP8.1

7.0F

F

Flash pointCNoncombustibleF

Freezing point (42% solution)C17.2F

Last crystal point (30% solution)C0F

pH (42% solution)9 12F

ToxicityCan cause skin irritation and burns, harmful to eyes, releases H2S on contact with acidF

12.1.2Shipping Information

Shipping containerTank truckD

Container capacityL19 000D

UnloadingpumpedA

12.1.3Storage RequirementsNumber of storage tankno.2B

TypeLined, with heat tracer and vented with a vapor capture systemB

The storages tanks will supply both plants (existing and new)A

Tank capacity, net eachm3400E

Retention time @ 28% solutiond1512E

12.1.4Distribution

Distribution typeloop and daily tank with manifoldB

Circulating pumps

Number

Capacityno.m3/h2

10B

E

Daily tank capacity (new plant, net)m321E

Metering pumps

Number

Capacity, 2 at

Capacity, 6 atno.m3/h

m3/h80.6 1.50.1 0.4E

E

E

12.1.5Consumption

New Moly plant consumption

at 100% NaHS

at 42% NaHS (aq)

at 28% NaHS (aq)

at 28% NaHS (aq)kg/t conc.kg/d

L/d

L/d

m3/h3.8

8 85416 39327 500

1.24.5(Note 2)10 48519 41532 5651.4A

E

E

E

E

Existing Moly plant consumption (Note 1)

at 100% NaHS

at 42% NaHS (aq)

at 28% NaHS (aq)kg/t conc.kg/d

L/d

L/d3.8

6 09511 28518 9304.5(Note 2)7 22013 36522 420A

E

E

E

Total consumption at 28% NaHS (aq)L/d46 43054 985E

Distribution to (at 28% solution):

Rougher feed box (60%), 1 point at

Rougher transfer boxes (16%), 2 points at

1st Cleaner feed box (8%), 1 point at

2nd Cleaner feed box (8%), 1 point at

3rd Cleaner feed box (8%), 1 point at

Existing Moly plant (general)m3/h

m3/h

m3/h

m3/h

m3/h

m3/h0.9

0.1

0.1

0.1

0.1

1.0E

E

E

E

E

E

Note (1): NaHS facilities will feed both moly plants.

Note (2): only for design purposes

12.2 Diesel Oil12.2.1Material Characteristics

FormLiquidF

Specific gravity at 15 C0.825F

Viscosity at 20CcP32F

Flash pointC43 72F

Freezing pointC-40F

ToxicitySkin, eye and mucous membrane irritant and central nervous system depressant; ingestion may lead to aspiration pneumonitis.F




UnloadingpumpedA

12.2.3Storage Requirements

Number of storage tankno.1B

Tank capacity (net)m340E

Supplyd15A6.2

12.2.4Distribution

Distribution typeLoopB

Circulating pumps

Number

Capacityno.m3/h2

7B

E

Metering pumps

Number

Capacityno.cm3/min3

10 150E

E

12.2.5Consumption

Moly plant consumption

As moly collector

For P-4000 dilutiong/t conc.

kg/d

L/d

L/d50(Note 1)1161401 435A

E

E

E

Distribution to:

Rougher feed conditioner, 1 point at

3rd Cleaner feed conditioner, 1 point at

P-4000 storage tankcm3/min

cm3/min

m3/h77261.0E

E

E

Note (1): only for design purposes12.3Sulfuric Acid12.3.1Material Characteristics

FormLiquidF

Chemical formulaH2SO4F

Strength%98D

Specific gravity at 20 C1.84D

Viscosity

at 0C

at 20CcP

cP60

24F

F

Flash pointCNonflammableF

ToxicityCan cause severe burns on contact with eyes and skin.F




UnloadingPneumaticD


Number of storage tankno.1B


The storage tank will supply both plants (existing and new)

Supply, at nominal consumptiond15A6.2

UnloadingPumpingD

Unloading pumps

Number

Capacityno.

m3/h25E

E

12.3.4 Distribution

Number of daily tank (new plant)no.1B

Daily tank capacity (net)m36E

DistributionMetering pumpsB

Metering pumps

Number

Capacity, 2 at

Capacity, 4 atno.

L/min

L/min6

0.9 3.00.2 0.6E

E

E

12.3.5Consumption

Total consumption, new plantkg/t

kg/d

L/d1.8

4 1952 2803.6(Note 1)8 3904 560A

E

E

Total consumption, existing plant (Note 2)kg/t

kg/d

L/d1.8

2 8901 5703.6(Note 1)5 775

3 140A

E

E

Distribution to:

Rougher feed conditioner, 1 point at

Rougher feed box, 1 point at

First cleaner feed box, 1 point at

Second cleaner feed box, 1 point at

Existing moly plant, generalL/min

L/min

L/min

L/min

L/min1.00.20.2

0.2

1.12.00.3

0.5

0.5

2.2E

E

E

E

Note (1): only for design purposesNote (2): Sulfuric Acid facilities will feed both moly plants.

12.4P-400012.4.1Material Characteristics

FormLiquidF

Chemical type100% active poly/glycol foam control agentF

Specific gravity at 15 C1.005F

Viscosity

at 0C

at 37.8CcST

cST4 000

455F

F

Flash pointC185F

Freezing pointC-26F

ToxicityNontoxicF


Shipping containerDrumD

Container capacityL204D

UnloadingpumpingD

Unloading pumps

Number

Capacityno.m3/h1

1.5E

E


Storage tank

Numberno.1B


Supplyd5E

Unloading, 1 atm3/h5E

Day tank

Numberno.1B


Supplyd1E

12.4.4Distribution

Distribution typeloopB

Circulating pumps

Number

Capacityno.m3/h2

5B

E

Metering pumps

Number

Capacityno.cm3/min515 150E

E

12.4.5Consumption

Total consumption

at 10% P-4000g/t

kg/d

L/d60

1401 575120(Note 1)2803 150B

E

E

Distribution to:

Rougher cells feed box, 1 point at

Rougher launder, 1 point at

1st Cleaner launder, 1 point at

Rougher concentrate box, 1 point at

Stand by, 1 point atcm3/min

cm3/mincm3/min

cm3/min

cm3/min150

150

150

150

150E

EE

E

E

Note (1): only for design purposes

13.0 ADDENDUM: MASS BALANCE

Includes 3rd cleaner concentrate and filtrate from moly filter.

Considers 50% availability.

PAGE Electronic documents, once printed, are uncontrolled and may become outdated.

Refer to the electronic documents in BecInfo for current revision.

BECHTEL Confidential BECHTEL 2007 All rights reserved.

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