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Zinc wet smelting cadmium remover and application method thereof

A technology of hydrometallurgy and zinc smelting, which is applied in the field of cadmium removal agent in zinc hydrometallurgy, and can solve problems such as increasing the difficulty of operation

Inactive Publication Date: 2019-05-24
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method requires more control conditions, such as the particle size of the adsorbent, the amount of addition, and the composition of the solution. These conditions increase the difficulty of operation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] According to the proportion, mix 34g of zinc sulfate and 16g of calcium sulfide, put them in 40ml of water, heat and stir at 70°C for 1h, put the reacted mixture in 1L of zinc sulfate solution containing cadmium, and the concentration of zinc in the solution before removing cadmium is 110g / L, the concentration of cadmium is 10g / L, the pH value is stable at 1 during the reaction, react at 90°C with a stirring speed of 250 rpm for 3.5 hours, filter, and the cadmium removal rate can reach 95%. The loss rate of zinc is less than or equal to 2%.

Embodiment 2

[0023] According to the proportion, mix 30g of zinc sulfate and 14g of calcium sulfide, put them in 40ml of water, heat and stir at 60°C for 1h, put the reacted mixture in 1L of zinc sulfate solution containing cadmium, and the concentration of zinc in the solution before removing cadmium is 130g / L, the concentration of cadmium is 8g / L, the pH value is stable at 0.5 during the reaction, react at 90°C with a stirring speed of 250 rpm for 4 hours, filter, and the cadmium removal rate can reach 96%. The loss rate of zinc is less than or equal to 2%.

Embodiment 3

[0025] According to the proportion, mix 27g of zinc sulfate and 15g of calcium sulfide, put them in 40ml of water, heat and stir at 65°C for 40min, put the reacted mixture in 1L of zinc sulfate solution containing cadmium, and the concentration of zinc in the solution before removing cadmium is 140g / L, the concentration of cadmium is 8.5g / L, the pH value is stable at 1 during the reaction, react at 90°C with a stirring speed of 250 rpm for 4 hours, filter, and the cadmium removal rate can reach 93%. The loss rate of zinc is less than or equal to 2%.

[0026] Comparative example 1;

[0027] Put 19g of zinc sulfide in 1L of cadmium-containing zinc sulfate solution. The concentration of zinc in the solution before removing cadmium is 135g / L, and the concentration of cadmium is 8.7g / L. During the reaction, the pH value is stable at 1. Minute stirring speed reaction for 4 hours, filtration, cadmium removal rate can reach 86%. The loss rate of zinc is about 2%. Its cost is 2 tim...

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Abstract

The invention relates to a zinc wet smelting cadmium remover and an application method thereof and belongs to the technical field of cadmium removal of solutions. The cadmium remover is prepared fromzinc sulfate, calcium sulfide and water, wherein the mass ratio of the zinc sulfate to the calcium sulfide is (1.5 to 2.5):1, and the cadmium remover is used for removing cadmium from a zinc smeltingleaching solution. The application method of the zinc wet smelting cadmium remover comprises the steps that the cadmium remover is added into the zinc smelting leaching solution containing cadmium, heating and stirring are conducted for reacting, and filtering is conducted after reacting. The cadmium remover designed by the invention is adopted to remove cadmium from the zinc smelting leaching solution, the removal rate of cadmium can reach 92% or above, and meanwhile, the loss rate of zinc is less than or equal to 2%. The zinc wet smelting cadmium remover is reasonable in component design, simple and controllable in application process and excellent in obtained effect, and large-scale industrial application is convenient.

Description

technical field [0001] The invention relates to a cadmium removal agent for zinc hydrometallurgy and an application method thereof, belonging to the technical field of solution cadmium removal. technical background [0002] As zinc consumption increases, the content and grade of primary zinc resources are declining. Therefore, from the perspective of resource utilization and environmental protection, smelting slag with high zinc content as a secondary resource must be further processed and recycled to promote the sustainable development of the zinc industry in the future. [0003] However, various impurity elements are contained in zinc smelting slag, including a large amount of cadmium in particular. When leaching zinc slag, cadmium will inevitably enter the leaching solution together with zinc, and its concentration in the leaching solution is relatively high, usually above 1g / L. Serious damage to zinc electrowinning. Therefore, in the hydrometallurgy process of zinc sl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/44C22B19/20
CPCY02P10/20
Inventor 孙伟杨越宋绍乐胡岳华韩海生王丽孙磊周嘉辉
Owner CENT SOUTH UNIV
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