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Method for treating selenium/mercury-containing acid mud

A treatment method and technology of acid mud, which is applied in the field of metallurgy, can solve the problems of low recycling rate of valuable metals, environmental pollution, etc., and achieve the effects of less investment in equipment, good economic benefits, and simple processes

Active Publication Date: 2015-04-29
BEIJING GENERAL RES INST OF MINING & METALLURGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a treatment method for selenium-containing mercuric acid mud, which can solve the problems of environmental pollution and low recycling rate of valuable metals, and has simple process, low equipment investment, no pollution, and good economic benefits. Recovers lead while recovering selenium and mercury

Method used

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  • Method for treating selenium/mercury-containing acid mud

Examples

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Effect test

Embodiment 1

[0038] ①Take 50g of selenium-containing mercuric acid mud, and analyze the main chemical components: Se 32.85%, Hg 35.44%, Pb 15.12%. Add acid mud to 500ml 300g / L sodium chloride solution, add hydrochloric acid to adjust pH to 1, react at 90°C for 2 hours; add sodium hydroxide to the filtered filtrate to adjust pH to 8, react for 2 hours, lead residue contains Pb 79.85%, Lead sinking slag tempering lead smelting system to recover lead.

[0039] ② Add lead leaching slag to 80g / L HCl solution, under the condition of liquid-solid ratio 10:1, 80℃, add 16.82g sodium chlorate, react for 2h, leaching slag contains Se 3.03%, Hg 0.64%, leaching slag Return to oxidation leaching for secondary leaching; add 40% NaOH to the leachate to adjust the pH of the solution to 13.5, and react for 2 hours to obtain mercury-rich slag with a mercury content of 90.74%; add mercury-rich slag to hydrazine hydrate solution for reduction, and after reduction, the slag is distilled at 240°C 2h, get metall...

Embodiment 2

[0043] ① Take 100g of selenium-containing mercuric acid mud, and analyze the main components: Se 32.85%, Hg 35.44%, Pb 15.12%. Add the acid mud into 1500ml 350g / L calcium chloride solution, add acid to adjust the pH to 1.5, react at 90°C for 2 hours; add calcium oxide to the filtered filtrate to adjust the pH to 8.5, and react for 3 hours. The lead residue contains 81.63% Pb. The lead smelting system of lead slag tempering method recovers lead.

[0044] ② Add lead leaching slag to 100g / L HCl solution, under the condition of liquid-solid ratio 8:1, 60℃, add 100ml hydrogen peroxide, react for 3h, leaching slag contains Se2.73%, Hg 0.41%, leaching slag returns to oxidation Leach for secondary leaching; add 30% NaOH to the leachate to adjust the pH of the solution to 13.0, and react for 2 hours to obtain mercury-rich residue with a mercury content of 86.32%. The mercury-rich residue is reduced by adding hydrazine hydrate solution, and the reduced residue is distilled at 200°C for ...

Embodiment 3

[0048] ① Take 50g of selenium-containing mercuric acid mud, and analyze the main components: Se26.44%, Hg 26.68%, Pb 24.61%. Add acid mud to 600ml 280g / L sodium chloride solution, add acid to adjust pH to 1, react for 2 hours at 85°C; after filtering, add sodium hydroxide to the filtrate to adjust pH to 8, react for 2 hours, lead residue contains Pb80.23% , the heavy lead slag tempering lead smelting system to recover lead.

[0049] ② Add lead leaching slag to 100g / L HCl solution, under the condition of liquid-solid ratio 10:1, 70℃, add 50ml hydrogen peroxide, react for 2h, leaching slag contains Se 2.44%, Hg 0.27%, leaching slag returns to oxidation leaching Perform secondary leaching; add 40% NaOH to the leachate to adjust the pH of the solution to 14, and react for 2 hours to obtain mercury-rich residue with a mercury content of 89.13%; add mercury-rich residue to hydrazine hydrate solution for reduction, and after reduction, the residue is distilled at 240°C for 2 hours to...

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Abstract

The invention discloses a method for treating selenium / mercury-containing acid mud. The method comprises the following steps: adding selenium / mercury-containing acid mud into a sodium chloride or calcium chloride solution, filtering and separating to obtain lead dipping solution and lead dipping residues; adding a sodium hydroxide or calcium oxide neutralizer into the obtained lead dipping solution, filtering, thereby obtaining the lead hydroxide residues and neutralized solution, wherein the lead hydroxide residues return to a lead smelting system to recycle the lead; adding the lead dipping residues into hydrochloric acid, slowly adding an oxidant, filtering and separating to obtain the mercury dipping residues and mercury dipping solution; adding a neutralizer into the mercury dipping solution for precipitating the mercury, filtering and separating to obtain mercuric oxide and selenium-containing solution, adding mercuric oxide into the diluted reducing agent solution, reducing mercury, distilling and purifying to obtain metal mercury, adding a reducing agent into the selenium-containing solution, filtering, thereby obtaining crude selenium and reduced solution. The treatment method is simple in process, low in equipment investment, pollution-free and good in economic benefits, selenium and mercury can be recycled, and lead also can be recycled.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a treatment method for selenium-mercuric acid mud. Background technique [0002] At present, in the smelting process of lead concentrate, due to the complexity of the raw materials of lead concentrate, trace selenium, mercury and other valuable elements contained in lead concentrate will enter the Acid making process; in the acid making purification process, it is enriched in the acid making acid mud due to the dust collection effect and other reasons. [0003] However, due to the complex composition of the generated selenium mercury acid mud, the processing difficulty is relatively large. In the prior art, many factories do not process or only do simple processing to recover part of the metals in the slag, lacking an effective treatment plan, which results in A great waste of resources and serious environmental problems have been brought about. Contents of the invention ...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B13/00C22B43/00C01B19/02
CPCY02P10/20
Inventor 王成彦杨永强邢鹏尹飞陈永强崔成旺郜伟揭晓武张永禄杨卜李强阮书锋马保中杨玮娇赵峰徐秉声
Owner BEIJING GENERAL RES INST OF MINING & METALLURGY
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