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Method enhancing oxidization leaching with arsenic in arsenic-cobalt-nickel containing slag

An arsenic-cobalt-nickel slag and leaching technology is applied in the field of arsenic-enhanced oxidation leaching in arsenic-cobalt-nickel slag to achieve the effect of reducing operating pressure

Inactive Publication Date: 2015-03-25
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can separate and recover valuable metals such as zinc, copper, cobalt, and nickel in arsenic-containing slag, but it does not involve the leaching and extraction of arsenic in slag, and the sulfuric acid leaching process has the risk of producing highly toxic arsine gas

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Prepare an alkali solution with a NaOH concentration of 200g / L, mix the arsenic-containing cobalt-nickel slag and NaOH solution evenly at a liquid-solid ratio of 4:1, and add to the mixed slurry according to the molar ratio of the total amount of As in the slag to CuO of 1:5 CuO; then put the mixed slurry in an alkali-resistant pressure kettle, start timing when the temperature of the slurry rises to 150°C, and continuously leaching for 2 hours; after the reaction is completed, add cooling water, and unload after the system temperature drops to 90°C material, and filtered for liquid-solid separation, the liquid phase is the arsenic-rich leaching solution, and the solid phase is the copper-rich slag after the arsenic oxidation and leaching after the solid phase is washed with hot water. After analysis, the arsenic content in the copper-rich slag was reduced to 0.05%, and the leaching rate of arsenic in the original arsenic-containing cobalt-nickel slag was 99.42%.

Embodiment 2

[0024] Prepare an alkali solution with a NaOH concentration of 300g / L, mix the arsenic-containing cobalt-nickel slag and NaOH solution evenly according to the liquid-solid ratio of 4:1, and mix the total amount of As in the slag with Cu 2 Add Cu to the mixed slurry with a molar ratio of 2:5 2 O; then put the mixed slurry in an alkali-resistant pressure kettle, start timing when the temperature of the slurry rises to 70°C, and continuously leaching for 2 hours; after the reaction is completed, add cooling water, and unload after the system temperature drops to 90°C material, and filtered for liquid-solid separation, the liquid phase is the arsenic-rich leaching solution, and the solid phase is the copper-rich slag after the arsenic oxidation and leaching after the solid phase is washed with hot water. After analysis, the arsenic content in the copper-rich slag was reduced to 0.11%, and the leaching rate of arsenic in the original arsenic-containing cobalt-nickel slag was 98.84%...

Embodiment 3

[0026] Prepare an alkaline solution with a NaOH concentration of 50g / L, mix the arsenic-containing cobalt-nickel slag and NaOH solution evenly at a liquid-solid ratio of 10:1, and add CuO to the mixed slurry according to the molar ratio of the total amount of As in the slag to CuO of 1:10 ; then put the mixed slurry in an alkali-resistant pressure kettle, and start timing when the temperature of the slurry reaches 300 °C; and continuously leaching for 6 hours; Liquid-solid separation is carried out by filtration, the liquid phase is arsenic-rich leaching solution, and the solid phase is copper-rich slag after arsenic oxidation and leaching after being washed with hot water. After analysis, the arsenic content in the copper-rich slag was reduced to 0.06%, and the leaching rate of arsenic in the original arsenic-containing cobalt-nickel slag was 98.75%.

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Abstract

The invention relates to a method for enhancing oxidization leaching of low-valence arsenic existed as an alloy form of arsenic copper, arsenic cobalt and arsenic nickel in arsenic-cobalt-nickel containing slag by taking NaOH or KOH solution as a leaching medium and taking a copper oxide as an oxidizing agent. In the method, on one hand, an alkali medium is taken as the leaching medium, thereby the risk of generation of arsine gas with severe toxicity can be avoided during acid leaching; on the other hand, the copper oxide is taken as the oxidizing agent, by comparing with oxygen pressure leaching of the alkali medium, operation pressure of a system is reduced, copper in the copper oxide can not be dissolved in the alkali medium, and can follow with copper in the arsenic-cobalt-nickel containing slag into a copper smelting system. The method is the further improvement of a pressure oxidation leaching-out method for the alkali medium.

Description

technical field [0001] The invention discloses a method for intensified oxidation leaching of arsenic in arsenic-containing cobalt-nickel slag, which relates to a method of using NaOH or KOH solution as a leaching medium and copper oxide as an oxidant to strengthen the oxidation leaching of low-valent arsenic in arsenic-containing cobalt-nickel slag. Background technique [0002] Arsenic is carcinogenic to the human body and is one of the five heavy metals targeted for prevention and control in the first category of my country's "Twelfth Five-Year Plan for Comprehensive Prevention and Control of Heavy Metal Pollution". With the development of industries such as mining, fossil fuel combustion, and non-ferrous metal smelting, the discharge of arsenic-containing wastes has increased year by year, causing huge environmental hazards. [0003] The arsenic-containing cobalt-nickel slag is produced in the zinc sulfate solution arsenic purification process in the zinc hydrometallurgy...

Claims

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Application Information

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IPC IPC(8): C22B30/04C22B15/00C22B7/00C22B3/12
CPCY02P10/20
Inventor 张盈余国林郑诗礼王晓辉张懿
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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