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Wet treatment method of copper smelting acid-making acid mud

A technology for wet processing and copper smelting, applied in the fields of non-ferrous smelting and environmental treatment, can solve the problems of incomplete separation of acid sludge-related elements, and achieve the effects of simple operation, easy control of process parameters and good operating environment.

Active Publication Date: 2020-06-05
HENAN ZHONGYUAN GOLD SMELTERY
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem of incomplete wet separation of selenium, mercury, copper, lead, etc. in acid mud produced by copper smelting, the present invention provides a wet treatment method for acid mud, which has the advantages of one-time leaching of copper, selenium and mercury Advantages: step by step separation and recovery of copper, selenium and mercury from the leaching solution, simple operation, easy control of process parameters, easy control of technical parameters, and realization of resource treatment of mercury and selenium in acid mud, completely solving the problem of wet process To deal with the problem of incomplete separation of acid mud related elements, the reaction of the whole process is mild and controllable, and the operating environment is good

Method used

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  • Wet treatment method of copper smelting acid-making acid mud

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A kind of wet treatment method of copper smelting acid mud, such as figure 1 As shown, the specific processing steps are as follows:

[0022] Take 1000g of acid mud and analyze its main chemical composition: Au: 28.5g / t, Ag: 510.6g / t, Pb: 56.53%, Cu: 2.79%, Se: 3.99%, Hg: 0.921%. Add the acid mud to 1000mL of water, the pH of the solution after mixing is about 4.5, heat up to 75°C, add 73.6g of sodium chlorate and 88.0g of sodium nitrate, react for 3 hours, filter to obtain leaching residue and leaching liquid, and recover gold from the leaching residue Silver lead; add 18.0g of copper powder to the leaching solution, react at 20°C for 3 hours, and the end point potential is 415mv to obtain 11.0g of mercury-rich slag and reduced liquid. The mercury-rich slag contains 84.2% mercury, 0.51% copper, 0.12% selenium, rich Mercury slag is mixed with water according to the liquid-solid mass ratio of 1:2 to obtain mercury-rich slag slurry. Add 15 g of hydrazine hydrate to the m...

Embodiment 2

[0024] A kind of wet processing method of copper smelting acid mud, its specific processing steps are as follows:

[0025] Take 1000g of acid mud and analyze its main chemical composition as follows: Au: 7g / t, Ag: 588g / t, Pb: 58.76%, Cu: 0.66%, Se: 1.85%, Hg: 0.453%. Add the acid mud to 1000mL of water, the pH of the solution after mixing is about 4.0, raise the temperature to 85°C, add 36.8g of sodium chlorate and 34.5g of sodium chloride, react for 2 hours, filter to obtain leaching residue and leaching liquid, and recover the leaching residue Gold, silver and lead; 6.5g of copper powder was added to the leaching solution, reacted at 30°C for 2 hours, and the terminal potential was 385mv to obtain 5.2g of mercury-rich slag and reduced liquid. The mercury-rich slag contained 83.9% of mercury, 0.45% of copper, and 0.26% of selenium. Mercury-rich slag is mixed with water according to the liquid-solid mass ratio of 1:2 to obtain mercury-rich slag slurry. Add 10 g of hydrazine hy...

Embodiment 3

[0027] A kind of wet processing method of copper smelting acid mud, its specific processing steps are as follows:

[0028] Take 1000g of acid mud and analyze its main chemical composition as follows: Au: 14.6g / t, Ag: 495.6g / t, Pb: 60.74%, Cu: 0.25%, Se: 2.87%, Hg: 0.676%. Add the acid mud to 1000mL of water, the pH of the solution after mixing is about 4.5, raise the temperature to 80°C, add 42.6g of sodium peroxide and 53.2g of sodium chloride, react for 2 hours, filter to obtain leaching residue and leaching liquid, and recover the leaching residue Gold, silver and lead; add 10.0g of copper powder to the leaching solution, react at 30°C for 2 hours, and the terminal potential is 385mv to obtain 7.9g of mercury-rich slag and reduced liquid. The mercury-rich slag contains 84.3% of mercury, 0.38% of copper, and 0.13% of selenium. Mercury-rich slag is mixed with water according to the liquid-solid mass ratio of 1:2 to obtain mercury-rich slag slurry. Add 12 g of hydrazine hydrat...

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Abstract

The invention discloses a wet treatment method of copper smelting acid-making acid mud. The wet treatment method comprises the following steps that acid-making acid mud is pulped, a chemical agent A and a chemical agent B are added for leaching after pulping, solid-liquid separation is carried out after leaching is finished to obtain leached residues and neutral leachate, and lead, gold and silverare recovered from the leached residues; a chemical agent C is added into the obtained leachate for reduction, the final reduction potential is controlled to be 300 mV-450 mV, and solid-liquid separation is carried out to obtain mercury-rich residues and a reduced solution; the pH value of the reduced solution is controlled to be less than 1, a chemical agent D is added for reduction, solid-liquid separation is carried out after the reaction is ended to obtain crude selenium and a selenium-precipitated solution, and the selenium-precipitated solution is conveyed to a water treatment procedureto recover copper; and water is added into the mercury-rich residues for pulping, a chemical agent E is added into the solution for reaction, solid-liquid separation is carried out after the reactionis ended, after solid is separated and dried, industrial mercury is obtained, liquid can be recycled, and periodic open-circuit treatment is carried out.

Description

technical field [0001] The invention belongs to the field of nonferrous smelting and environmental treatment, and in particular relates to a wet treatment method for producing acid mud from copper smelting. Background technique [0002] Nonferrous smelting enterprises, especially pyrometallurgical enterprises, produce sulfur dioxide flue gas during the smelting process. The flue gas contains sulfur dioxide, arsenic, lead, selenium, mercury and other elements, and is also mixed with mineral powder to varying degrees. The flue gas is generally Enter the acid system to produce industrial sulfuric acid. Although the flue gas has passed through smelting electric dust collection and other dust removal links, it still contains certain impurities. In the acid system, it is firstly sprayed to purify and cool down to remove most of the remaining smoke and sulfur trioxide in the flue gas. Generally, the soluble parts in the water obtained by spraying are impurity elements such as arse...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B13/00C22B11/00C22B43/00C01B19/02
CPCC01B19/02C22B7/006C22B11/042C22B13/045C22B43/00
Inventor 田静李晓恒王夏崔育涛彭国敏廖忠义郭引刚张占尧
Owner HENAN ZHONGYUAN GOLD SMELTERY
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