Recovery of lead from Zinc Plant Residue.

1.

Title of Product/Design/Equipment.

Recovery of lead from Zinc Plant Residue.

2.

IPR Status

Patent/Abroad IPR Details

Patent Application No: 1589DEL2010

3.

Application/Uses

Recovery of Pb and Zn

4.

Salient Technical Feature including Competing Feature

Subsequent to zinc extraction with sulphuric acid from various zinc secondaries, insoluble lead in the form of sulphate remains in the leach residue.The residue containing appreciable amount of lead is treated as hazardous waste. A complete flow-sheet for recovery of lead is developed with following key features:

Overall recovery is >96% of lead and simultaneously recovers >70% of both Cu & Zn present in the residue

Recovers lead as lead chloride, lead oxide, or cement lead Operates in a close loop without generation of any toxic effluents The final residue containing <0.2% lead can be safely dumped.

5.

Level/Scale of Development

Developed and demonstrated on 1 Kg scale

6.

Environmental Consideration

No toxic liquid effluent is generated as the process operates in close loop. About 500 - 600 kg of leached residue containing <0.2% Pb is generated, which is suitable for dumping. All other streams are recycled or treated for metal recovery.

7.

Status of Commercialization

Transferred to M/s Cinkom Lead Zinc Metal Mining Co.,Turkey

8.

Major Raw Material to be Utilized

Secondary zinc plant residue, other lead containing residue

9.

Major Raw Plant Equipment and Machinery Required

Leaching reactor, filter press, storage tanks, transfer pumps

10.

Techno-Economics

Chemical requirement cost is about Rs. 7,000 /- against product cost of about Rs. 30,000/- per ton of lead residue processing (Pb in residue ~15%)

11.

Technology Package

Process know-how, complete flow-sheet with mass balance, equipment details, process description, equipment flow-diagram, cost estimate, product specification plant layout and quality assurance methods. Also assistance in setting up the plant on separate terms.