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Separating and recycling method for thallium in nickel-cobalt sulfate solution

A technology of separation and recovery of nickel and cobalt sulfate, applied in the direction of improving process efficiency, etc., can solve problems affecting the health of workers, affecting the extraction rate of thallium, environmental pollution, etc., and achieve low cost, improved extraction rate, and low operating conditions. Effect

Active Publication Date: 2018-04-13
清远先导材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, some organic solvents for extracting thallium, such as benzene, ether, toluene, isopropyl ether, and methyl isobutyl ketone, are volatile and toxic, causing environmental pollution and affecting the health of workers, and these extraction solvents are more expensive
In this regard, the existing technology uses P204 to extract thallium from sulfuric acid solution; however, kerosene as a diluent has a strong reducing ability, and it can reduce trivalent thallium to monovalent thallium, which affects the extraction rate of thallium

Method used

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  • Separating and recycling method for thallium in nickel-cobalt sulfate solution
  • Separating and recycling method for thallium in nickel-cobalt sulfate solution
  • Separating and recycling method for thallium in nickel-cobalt sulfate solution

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Experimental program
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Effect test

Embodiment 1

[0055] (1) Inject 1L of thallium-containing nickel-cobalt sulfate solution into the beaker, control the temperature of the nickel-cobalt sulfate solution to 25°C, turn on the stirring paddle, set the stirring speed to 340r / min, add NaOH solution to adjust the pH=1.5, adjust After completion, add 2 g mass concentration of 50% H 2 o 2 solution, and oxidized for 30 minutes to obtain a reaction mixture solution.

[0056] (2) add NaCl in the reaction mixed solution that step (1) obtains, the ratio of the add-on of NaCl and the volume of described reaction mixed solution is 50g: 1L, after stirring evenly, add extraction solvent (35%N 235 , 10% TBP, 55% sulfonated kerosene), extract according to O / A=1:1, set the stirring speed to 350r / min, stir for 3min, let stand for 10min, carry out two-phase separation after standing, and obtain Thallium-containing organic phase and raffinate (recovery of nickel and cobalt).

[0057] (3) Add 6mol / L of NH to the thallium-containing organic phase...

Embodiment 2

[0064] (1) Inject 1L of thallium-containing nickel-cobalt sulfate solution into the beaker, control the temperature of the nickel-cobalt sulfate solution to 25°C, turn on the stirring paddle, set the stirring speed to 340r / min, add NaOH solution to adjust the pH=1.5, adjust After completion, add 2 g mass concentration of 50% H 2 o 2 solution, and oxidized for 30 minutes to obtain a reaction mixture solution.

[0065] (2) add NaCl in the reaction mixed solution that step (1) obtains, the ratio of the add-on of NaCl and the volume of described reaction mixed solution is 10g: 1L, after stirring evenly, add extraction solvent (20% N 235 , 10% TBP, 70% sulfonated kerosene), extract according to O / A=1:1, set the stirring speed to 350r / min, stir for 10min, let stand for 10min, carry out two-phase separation after standing, and obtain Thallium-containing organic phase and raffinate (recovery of nickel and cobalt).

[0066] (3) Add 6mol / L of NH to the thallium-containing organic pha...

Embodiment 3

[0073] (1) Inject 1L of thallium-containing nickel-cobalt sulfate solution into the beaker, control the temperature of the nickel-cobalt sulfate solution to 25°C, turn on the stirring paddle, set the stirring speed to 350r / min, add NaOH solution to adjust the pH=1.5, adjust After completion, add 2 g mass concentration of 50% H 2 o2 solution, and oxidized for 30 minutes to obtain a reaction mixture solution.

[0074] (2) add NaCl in the reaction mixed solution that step (1) obtains, the ratio of the add-on of NaCl and the volume of described reaction mixed solution is 25g: 1L, after stirring evenly, add extraction solvent (5%N 235 , 10% TBP, 85% sulfonated kerosene), extract according to O / A=2:1, set the stirring speed to 350r / min, stir for 30min, let stand for 60min, carry out two-phase separation after standing, and obtain Thallium-containing organic phase and raffinate (recovery of nickel and cobalt).

[0075] (3) Add 6mol / L of NH to the thallium-containing organic phase o...

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Abstract

The invention provides a separating and recycling method for thallium in a nickel-cobalt sulfate solution. The separating and recycling method includes the following steps that a), the nickel-cobalt sulfate solution, a pH adjusting agent and an oxidizing agent are mixed for carrying out an oxidation reaction, and a reaction mixed solution is obtained; b), the reaction mixed solution obtained in the step a) and chlorate salt are mixed, then an extracting solvent is adopted for quenching, and after two phases are separated, an organic phase including thallium and raffinate are obtained, whereinthe extracting solvent is composed of tertiary amine, tributyl phosphate and sulfonated kerosene; and c), ammonia water is adopted for the organic phase including thallium for back extraction, and after the two phases are separated, thallium-containing back extracting liquid and a lean organic phase are obtained. Compared with the prior art, the extracting solvent containing tertiary amine is adopted in a breakthrough manner for extracting thallium under a sulfuric acid system, the thallium extracting rate is increased by controlling a specific technology, and therefore thallium can be thoroughly separated. In addition, by means of the separating and recycling method, pollution is avoided, the cost is low, and great economic benefits are achieved for comprehensive recycling of thallium.

Description

technical field [0001] The invention relates to the technical field of hydrometallurgy, in particular to a method for separating and recovering thallium in a nickel-cobalt sulfate solution. Background technique [0002] Thallium is widely used in aerospace, national defense, electronic communication, chemical industry, metallurgy and other fields, but the content of thallium is rare and highly dispersed. In addition, the toxicity of thallium is higher than that of arsenic and mercury, and in some chemical engineering, very low levels of thallium will affect the production process or product quality. For example, more than 0.1mg / L of thallium in zinc hydrometallurgy will cause problems such as corrosion of cathode plates and burnt plates during electrolysis. Therefore, in order to ensure that qualified products are produced, the solution must be purified to remove thallium in the nickel-cobalt sulfate solution (nickel sulfate, cobalt sulfate solution), which is beneficial to...

Claims

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Application Information

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IPC IPC(8): C22B3/40C22B61/00
CPCC22B61/00C22B3/409Y02P10/20
Inventor 刘鸿飞殷亮陈辉熊平朱刘
Owner 清远先导材料有限公司
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