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Method of comprehensively recovering valuable metals in lead, zinc and silver-containing material

A technology for valuable metals and materials, applied in the field of comprehensive recovery of valuable metals in materials containing lead, zinc and silver, to achieve the effects of clean production, low cost of raw materials, and improved utilization

Active Publication Date: 2018-07-03
有研资源环境技术研究院(北京)有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is currently no suitable way to deal with it other than stockpiling

Method used

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  • Method of comprehensively recovering valuable metals in lead, zinc and silver-containing material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] process such as figure 1 As shown, 100g of lead-zinc-silver material (Zn: 6.21%, Pb: 7.09%; Ag: 324.1g / t) from a lead-zinc smelter in Inner Mongolia was ground to a particle size of -200 mesh to -400 mesh, and concentrated Sulfuric acid (content 98%) 60g, sodium sulfate 60g carry out batching and mix evenly, put into muffle furnace and roast, control roasting temperature to be 250 ℃, roasting time is 2h. After roasting, the obtained material was added to sulfuric acid solution (concentration ~ 2wt%), the solid-to-liquid ratio (g / mL) was 1:5, stirred at 90°C for 1 hour and then filtered to obtain filtrate I containing zinc and Filter residue of lead and silver. Then add sodium carbonate to the zinc-containing filtrate I, adjust its pH to 3.5, and react at 50° C. for 1 hour to neutralize and remove iron. Then add sodium sulfide (excess coefficient: 0.9) to the zinc-containing filtrate I after iron removal, and react at a temperature of 50° C. and a reaction time of 1 h ...

Embodiment 2

[0037] process such as figure 1 As shown, 100g of lead-zinc-silver material (Zn: 6.21%, Pb: 7.09%, Ag: 324.1g / t) from a lead-zinc smelter in Inner Mongolia was ground to a particle size of -200 mesh to -400 mesh, and concentrated Sulfuric acid (content 98%) 70g, sodium sulfate 70g carry out batching and mix evenly, put into muffle furnace and roast, control roasting temperature to be 300 ℃, roasting time is 3h. After roasting, the obtained material was added to sulfuric acid solution (concentration ~ 3wt%), the solid-to-liquid ratio (g / mL) was 1:5, stirred at 90°C for 1.5h, and then filtered to obtain filtrate I containing zinc and Filter residue containing lead and silver. Then add sodium carbonate to the zinc-containing filtrate I, adjust its pH to 4.0, and react at 70° C. for 1 hour to neutralize and remove iron. Then add sodium sulfide (excess coefficient: 0.9) to the zinc-containing filtrate I after iron removal, and react at a temperature of 70° C. and a reaction time ...

Embodiment 3

[0040] process such as figure 1 As shown, 100g of lead-zinc-silver material (Zn: 6.21%, Pb: 7.09%, Ag: 324.1g / t) from a lead-zinc smelter in Inner Mongolia was ground to a particle size of -200 mesh to -400 mesh, and concentrated Sulfuric acid (content 98%) 90g, sodium sulfate 90g carry out batching and mix evenly, put into muffle furnace and roast, control roasting temperature to be 350 ℃, roasting time is 4h. After roasting, the obtained material was added to sulfuric acid solution (concentration ~ 3wt%), the solid-to-liquid ratio (g / mL) was 1:5, stirred at 95°C for 2h and then filtered to obtain filtrate I containing zinc and Filter residue of lead and silver. Then add sodium carbonate to the zinc-containing filtrate I, adjust its pH to 3.6, and react at 90° C. for 2 hours to neutralize and remove iron. Then add sodium sulfide (excess coefficient: 0.9) to the zinc-containing filtrate I after iron removal, and react at a temperature of 90° C. and a reaction time of 2 hours...

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Abstract

The invention provides a method of comprehensively recovering valuable metals in a lead, zinc and silver-containing material. The method comprises the following steps: grinding the lead, zinc and silver-containing material, proportioning, roasting, leaching with a sulfuric acid solution and filtering, wherein zinc enters a solution I and lead and silver are left in slag; converting phase of the zinc-containing solution I after the zinc-containing solution I is neutralized and de-ironed, filtering the solution to obtain zinc sulfate and a filtrate II, smelting and recovering zinc sulfide, carrying out evaporative crystallization on the filtrate II to obtain sodium sulfate crystals which then enter a proportioning station; leaching the lead and silver-containing slag with a chlorine salt solution, filtering the solution while being hot to obtain a filtrate III; then adding a lead sheet into the filtrate III to replace silver, and filtering the filtrate to obtain coarse silver powder anda filtrate IV; and then converting phase of lead for the filtrate IV, filtering the filtrate IV to obtain lead sulfate and a filtrate V, smelting and recovering lead sulfate, supplementing calcium chloride for the filtrate V and feeding the filtrate V to a chlorine salt leaching station. The recovery rate of zinc is greater than 95%, the recovery rate of lead is greater than 98%, and the recoveryrate of silver is greater than 90%. The method has the advantages of being high in recovery rate, low in energy consumption, being recycled of the solution and the like.

Description

technical field [0001] The invention belongs to the field of nonferrous metal smelting and relates to a method for recovering valuable metals, in particular to a method for comprehensively recovering valuable metals in materials containing lead, zinc and silver. Background technique [0002] Lead-zinc smelting enterprises will produce a large amount of waste materials containing lead and zinc (containing Zn ~ 5%, Pb ~ 5%) every year, and these materials are often accompanied by the existence of silver (100 ~ 600g / t). Apart from stockpiling, there is currently no suitable way to deal with it. The treatment of the waste materials containing lead, zinc and silver has always been an important subject of research in the fields of environmental protection and resource utilization. How to efficiently and comprehensively recover the valuable metals in this material, such as lead, zinc, silver, etc., has always been a research hotspot in the field of non-ferrous metallurgy, which ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/06C22B7/00C22B19/20C22B19/30C22B13/00C22B11/00
CPCC22B1/06C22B7/007C22B11/042C22B13/045C22B19/22C22B19/30Y02P10/20
Inventor 高文成温建康武彪刘美林刘学尚鹤
Owner 有研资源环境技术研究院(北京)有限公司
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