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Regeneration method of dechlorination slag, regenerated dechlorination circulating slag and regenerated circulating dechlorination method

A technology of dechlorination and alkali washing, which is applied in the field of regeneration of dechlorination slag, regenerated dechlorination cycle slag and regeneration cycle dechlorination, can solve the problems of large amount of bismuth oxide and poor dechlorination effect, so as to improve the dechlorination rate, The effect of reducing production costs and delaying the decay rate

Active Publication Date: 2022-05-17
SHENZHEN ZHONGJIN LINGNAN NONFEMET COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is to overcome the problems in the prior art that the dechlorination agent in the dechlorination system of the purification workshop fails too quickly, the dechlorination effect is poor, and the amount of bismuth oxide is large, so as to effectively improve the dechlorination efficiency and improve the open circuit capacity of chloride ions in the system , while reducing the production cost of dechlorination

Method used

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  • Regeneration method of dechlorination slag, regenerated dechlorination circulating slag and regenerated circulating dechlorination method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Add the NaOH solution with a concentration of 1.5mol / L into the chlorine slag alkali washing tank, and use steam to raise the temperature in the acidizing tank to 90°C; add the dechlorinated slag to the chlorine slag alkali washing tank, keep stirring at a temperature of 95°C for 1 hour, and control The pH at the end point is 12, and then it is pumped into an alkali washing filter press for pressure filtration to obtain an alkali washing residue.

[0037] Add 20g of washed and dried alkali washing slag to the acidification tank, then add 100ml of electrolytic waste liquid containing 180g / l of sulfuric acid into the acidification tank for reaction, and adjust the final acid to contain 70g / l of sulfuric acid; The temperature was raised to 80° C., and then 10 g of anhydrous copper sulfate was added into the acidification tank, and reacted for 1 hour.

[0038] Add 1.5L of dechlorinated pre-solution, control the temperature at 60°C, stir for 1 hour and take the filtrate to m...

Embodiment 2

[0044] Add NaOH solution with a concentration of 1.5mol / L into the chlorine slag alkali washing tank, and use steam to raise the temperature in the acidizing tank to 90°C; keep the temperature at 90°C and stir for 0.5 hours, control the end point pH to 14, and then pump into the alkali washing pressure The filter press is filtered to obtain the alkali washing residue.

[0045] Add 20g of washed and dried alkali-washed slag to the acidification tank, then add 115ml of electrolytic waste liquid containing 180g / l of sulfuric acid into the acidification tank for reaction, and adjust the final reaction acid to contain 70g / l of sulfuric acid; The temperature was raised to 80° C., and then 10 g of anhydrous copper sulfate was added into the acidification tank, and reacted for 1 hour.

[0046] Add 1.5L of dechlorinated pre-solution, control the temperature at 60°C, stir for 1 hour and take the filtrate to measure the rate.

Embodiment 4

[0056] Add NaOH solution with a concentration of 1.6mol / L to the chlorine slag alkali washing tank, and use steam to raise the temperature in the acidification tank to 85°C; add the dechlorinated slag to the chlorine slag alkali washing tank, keep stirring at a temperature of 90°C for 1 hour, and control The pH at the end point is 12, and then it is pumped into an alkali washing filter press for pressure filtration to obtain an alkali washing residue.

[0057] Add 20g of washed and dried alkali-washed slag into the acidizing tank, then add the electrolytic waste liquid containing 180g / l of sulfuric acid into the acidizing tank for reaction, and adjust the final reaction acid to contain 70g / l of sulfuric acid; use steam to reduce the temperature in the acidizing tank Raise to 60-90°C, then add anhydrous copper sulfate into the acidification tank, and react for 0.5-2 hours, the mass ratio between the alkali washing residue, the electrolytic waste acid, and the copper sulfate is 1...

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Abstract

The invention relates to a regeneration method of dechlorination residues, regenerated dechlorination circulating residues and a regenerated circulating dechlorination method, and the regeneration method comprises the following steps: carrying out alkali washing on the dechlorination residues to obtain alkali washing residues; and electrolytic waste acid is added into the alkali washing slag for acidification, then copper sulfate is added, and the regenerated dechlorination circulating slag is obtained after a reaction. According to the method, the failed bismuth oxide dechlorination circulating slag is treated by using the electrolytic waste acid and the copper sulfate, the electrolytic waste acid contains sulfite radicals, the sulfite radicals and bismuth in the dechlorination agent easily generate bismuth sulfite, bismuth sulfide is generated after decomposition, bismuth sulfide cannot react with chloride ions, and the dechlorination effect cannot be achieved. The characteristic that the solubility product constant of copper sulphide is far lower than that of bismuth sulphide is utilized, copper sulfate is added into acidified slurry of the dechlorination circulating slag, bismuth in bismuth sulphide is replaced with copper ions, the bismuth sulphide is eliminated, the dechlorination effect of bismuth is recovered, and effective regeneration of invalid dechlorination slag is achieved.

Description

technical field [0001] The invention relates to the field of zinc hydrometallurgy, in particular to a regeneration method for dechlorination slag, a regenerated dechlorination cycle slag and a regeneration cycle dechlorination method. Background technique [0002] In the zinc hydrometallurgy process, the presence of a large amount of chlorine will accelerate the corrosion of equipment and pipelines in contact with the medium, resulting in more equipment failures and increased production costs. It will also cause corrosion of the anode lead-silver plate in the process of zinc electrowinning, and lead to the deposition of corrosion products on the cathode, which will affect the precipitation grade rate of zinc. For this reason, the hydrometallurgy process of zinc requires the control system to contain chlorine. Zinc smelters generally use rotary kilns, fuming furnaces and other equipment to recover zinc metal in the slag through reduction, volatilization and re-oxidation to p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F103/16C02F101/12
CPCC02F1/58C02F1/001C22B19/00C22B7/006C02F2101/12C02F2103/16Y02P10/20
Inventor 胡凯张登凯滕年高欧阳全红郑莉莉刘标刘文东曾日明刘庆亮邱勋明邹强
Owner SHENZHEN ZHONGJIN LINGNAN NONFEMET COMPANY
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