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Wet cleaning treatment method for lead chloride slag

A clean treatment, lead chloride technology, applied in the improvement of process efficiency, photography technology, instruments, etc., can solve the problems of corrosion of furnace and steel smoke pipes, taking away lead, and chlorine gas polluting the atmospheric environment, etc.

Inactive Publication Date: 2018-11-27
YIYANG SHENGLI CHEM IND +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, lead chloride slag often produces a large amount of chlorine gas overflow during the smelting process, which not only takes away valuable metals such as lead and silver, reduces its smelting direct yield, but also severely corrodes the furnace and steel smoke pipes. Serious air pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The composition and content (mass percentage) of lead chloride slag provided by a company in Hunan are: Pb 71.3%, Cu 1.1%, Bi 0.22%, Sb 0.37%, As 0.13%, Cl - 26.7%, Ag 833g / t.

[0029] Take 1000g of the lead chloride slag, configure 5L of ammonium acetate solution as the leaching solution for coordination leaching, and add 2g of calcium lignosulfonate to the leaching solution during leaching. The amount of ammonium acetate in the ammonium acetate solution is 2 times of the theoretical amount required to form lead ammonium acetate from the lead in the lead chloride slag. The leaching temperature is 50°C, and the leaching time is 90 minutes. Liquid-solid separation after leaching, analysis of Pb in the filtrate 2+ The leaching rate was calculated to be 99.2%, and the concentration of Cu, Bi, Sb, As and Ag in the leaching solution was analyzed, and it was found that they were almost not leached. Pump 4.97L of the obtained leaching solution into the cathode chamber of th...

Embodiment 2

[0031] The composition and content (mass percentage) of lead chloride slag provided by a company in Yunnan are: Pb 66.8%, Cu 1.9%, Bi 0.91%, Sb 0.57%, As 0.22%, Cl - 25.0%, Ag 1135g / t.

[0032] Take 1000g of the lead chloride slag, configure 6L ammonium acetate solution as the leaching solution for coordination leaching, and add 4g of sodium lignosulfonate to the leaching solution during leaching. The amount of ammonium acetate in the ammonium acetate solution is 4.5 times of the theoretical amount required to form lead ammonium acetate from the lead in the lead chloride slag. The leaching temperature is 80°C and the leaching time is 160min. Liquid-solid separation after leaching, analysis of Pb in the filtrate 2+ The leaching rate was calculated to be 98.8%, and the concentration of Cu, Bi, Sb, As and Ag in the leaching solution was analyzed, and it was found that they were almost not leached. All 5.89L of the obtained leachate was pumped into the cathode chamber of the di...

Embodiment 3

[0034] Get the lead chloride slag 1000g among the embodiment 1, get the cathodic electrolytic depletion solution 5L in the above embodiment 2 as leachate, add the calcium lignosulfonate of 3g in the leachate during leaching. The leaching temperature is 30°C, and the leaching time is 60 minutes. Liquid-solid separation after leaching, analysis of Pb in the filtrate 2+The leaching rate was calculated to be 98.1%, and the concentration of Cu, Bi, Sb, As and Ag in the leaching solution was analyzed, and it was found that they were almost not leached. All 4.96L of the obtained leachate is pumped into the cathode chamber in the diaphragm electrolyzer as the catholyte, and 5L of the depleted anode electrolysis solution in the above embodiment 2 is taken, and ammonia water is added therein to adjust its pH value to the level in the diaphragm electrolytic cell. The initial pH of the pre-anolyte (pH 5.0). Afterwards, the solution after adjusting the pH value is pumped into the anode c...

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Abstract

The invention discloses a wet cleaning treatment method for lead chloride slag. The method comprises the following steps: 1, coordination leaching of lead chloride slag, namely performing coordinationleaching on the lead chloride slag by taking an ammonium acetate solution as a coordination leaching agent, and performing solid-liquid separation after leaching completion so as to obtain a leachingsolution containing a lead complex and leaching slag; 2, performing diaphragm electrodeposition on the leaching solution to extract lead, and performing diaphragm electrodeposition by taking the leaching solution containing the lead complex obtained in the step 1 as cathode liquor and taking an ammonium chloride solution as anode liquor so as to extract lead; and 3, performing post-treatment on an electrolytic stripped solution, returning the cathode electrolytic stripped solution obtained in the cathode chamber to be used for leaching after electrodeposition completion, adding a neutralizerinto an anode electrolytic stripped solution in the anode chamber to regulate the pH value, and returning to the step 2 to serve as the anode liquid for later use. According to the method, various lead chloride slag can be cleaned and efficiently treated, and the electric lead product with high purity is directly obtained. The wet cleaning treatment method disclosed by the invention has the outstanding advantages of being high in raw material adaptability, simple in process flow, clean, environment-friendly and the like.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy, and in particular relates to a method for wet cleaning treatment of lead chloride slag. Background technique [0002] In the lead and bismuth smelting industry, during the refining and purification process of lead and bismuth, a large amount of lead chloride slag is often produced, which usually contains 60-70% lead. In addition, lead chloride slag often contains silver, bismuth and copper, etc., and the grade is usually high, which has good recycling value. [0003] At present, the method for treating lead chloride slag is mainly to use a reverberatory furnace at a temperature of 950-1250°C, add lime to produce calcium chloride slag and add reduced coal to reduce and smelt the lead in it to produce crude lead containing about 97%. Lead and thereby enrich other valuable metals. However, lead chloride slag often produces a large amount of chlorine gas overflow during the smelting process, which no...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C25C1/18
CPCC22B7/006C22B7/04C25C1/18Y02P10/20
Inventor 唐好杨建广李陵晨丁龙南天翔刘山闫万鹏
Owner YIYANG SHENGLI CHEM IND
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