Improvement Projects

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Improvement Projects by Mind Map: Improvement Projects

1. Increasing efficiency of removing H2S at BA010

2. Purification1

2.1. Batch removal of V/As

2.1.1. Using outside reagent: solution (NH4)2SO4

2.1.2. Using current chemicals: ASS, MSS, NaHS

2.2. Automatic control of chemical dosage based on impurities analysis

2.3. continous process removal of V/As/Si

2.3.1. Using current chemicals: ASS, MSS, NaHS in P1 process

2.4. Reduce the WO3 content in residue P1

2.5. Fluoride treatment by Mg2+ / Ion exchange

2.6. Dosing point of MSS in BA120 to treat Si/As/V

2.7. Treat Si from feeding STS at level 10.000 ppm

3. Purification2

3.1. Optimize dosing NaHS

3.2. Reduce the WO3 content in residue P2

3.3. Using Na2S instead of NaHS

4. Leaching

4.1. Increase the WO3 recovery

4.1.1. using pressure on leaching reaction to reduce milling time

4.1.2. using pressure on leaching reaction to increase the WO3 recovery

4.1.3. at atmospheric, increase the milling time, caustic, reaction time

4.1.4. increase the temperature

4.1.5. investigate any chemical could be react with Ca and prevent the back reaction

4.1.5.1. some chemicals can be use: Na2CO3, Na2SO4, Na3PO4, Na2SiO3, Al(OH)3

4.1.5.2. Add Na2SiO3 for dilution tank

4.1.6. Reduce particle size after before reactorl

4.2. Caustic reduction

4.2.1. increase the S/L ratio,

4.2.2. Produce APT via ST product to increase WO3 recovery and reduce caustic consumption

4.3. Reduce WO3 concentration in TC feed

4.3.1. Counter current leach

4.4. Acid leach with HCl/H2SO4

5. Solvent extraction

5.1. Recycle sludge from SX area

5.2. Reduce sludge amount in BA515, BA603, BA605 - using H2O2 in stripped liquor

5.3. Control S in OP

5.3.1. TSS from STS

5.3.2. Thiosulfate content at STS

5.4. Trial with increasing amine content to 11%

5.5. Replace current amine by Alamine 308/336

5.6. Improve efficiency of settler BA503, BA508

5.7. Optimize drain valve for BA507, BA508, FB500

5.8. Set up at line instrument for measuring density, WO3 in OP

5.9. Improve clarify of solution at sedimentation (BA201/202)

5.9.1. Filter after BA201

5.10. Change material of coalescer at BA530/BA590 by Stainless steel

5.11. Change the design of agitator at BA515

6. Milling

6.1. Reduce grinding time

6.2. Grinding with liquid caustic or recycle lye to reduce water and increase reaction efficiency

7. Crystallisation

7.1. Increase yield (mass APT) after each batch

7.2. Crystallisation from SX stripping - 3-phases centrifuge separator or equivalent

7.3. Adjust particle size/ AD of APT

7.4. Treat impurities as F, Si directly in mother liquor

7.5. Seeding by pumping sludge to crystallization

7.6. Continuous crystallizer

7.7. Find out the effect of parameter to APT properties

8. Calcination

8.1. BTO calcination in vacuum instead of N2

8.2. Inlet air filtering for YTO calcination

8.3. Determine the number of oxygen in WO3-x by SGS

8.4. Adjust the physical properties of YTO/BTO

8.5. Re-use BTY/YTO dust, not recycle at BA650

8.6. Make nano-particle size of tungsten oxide

9. Utilities

9.1. Optimize energy consumption by reuse secondary steam for heating up stream.

9.2. Optimize heat exchange and isolation for steam system to reduce energy loss

9.3. RO plant automation

9.4. Coal boiler

9.4.1. Diesel additive trial

9.4.2. Coal additive trial

9.4.3. Recycling of boiler slag

9.4.4. Utilise boiler exhaust gas to heat up feed water

9.4.5. Reduce comsumption rate of chain grade

9.4.5.1. Low calorie coal trial

9.4.5.2. Improve material of chain grade

9.5. Use H2SO4 96% for repalcement 65%

10. Recycling

10.1. High WO3 P2 sludge - Caustic leach followed by pH adjustment

10.2. SX for selectively load and strip of different element - V/Mo/W

10.3. Acid leach of R-P1R for SX feed

10.4. Acid leaching of PLR

10.4.1. H2SO4 leaching

10.4.1.1. SX of leached liquor

10.4.2. HCL leaching

10.4.3. Gravity separation of PLR

10.4.3.1. H2O2 leaching of H2WO4

10.4.3.2. Centrifugal separation

10.4.3.3. Shaking table separation

10.4.3.4. Superpanel testwork

11. OSA

11.1. Online ICP

11.2. Online elemental prob analysis - ISE