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A method for preparing cadmium oxide from zinc smelting cadmium-containing fumes

A cadmium oxide and zinc smelting technology, applied in chemical instruments and methods, cadmium compounds, inorganic chemistry, etc., can solve problems such as difficult separation and complicated process, and achieve the effect of simple equipment, simple process and strong implementability

Active Publication Date: 2016-03-30
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can better deal with arsenic-containing dust or materials, but when this method recovers other valuable metals, such as zinc and cadmium, the process is complicated and it is difficult to completely separate them.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Weigh 1 kg of zinc smelting dust, whose composition is shown in Table 1, add sulfuric acid solution with a concentration of 90g / L for leaching, and leaching at 60°C for 1 hour at a liquid-solid ratio of 6:1, the leaching rate of cadmium is 99.6%.

[0014] Table 1 Chemical composition of zinc smelting dust (wt%)

[0015] element Na K Fe Cu Zn As CD Pb content 0.08 0.99 0.02 0.09 0.20 0.05 18.32 42.45

[0016] Add FeCl to the leaching solution 3 , wherein the ratio of the amount of Fe and As is 3:1, then add 5 times the theoretical amount of hydrogen peroxide, adjust the pH to 5 with NaOH, and filter. Add the P204 extraction agent that the mass concentration is 20% in the filtrate, O / A=1, extraction time 15min, separate and obtain raffinate after static stratification, adopt primary extraction, zinc removal rate reaches 96.8%, raffinate Medium Zn 2+ The concentration is 0.5mg / L, Cd 2+ The concentration is 23.83g / L.

[0017] D...

Embodiment 2

[0021] Take 10kg of cadmium-containing fumes, the composition of which is shown in Table 3, add sulfuric acid solution with a concentration of 110g / L for leaching, and leaching at 50°C for 2 hours at a liquid-solid ratio of 5:1, the leaching rate of cadmium is 99.2%.

[0022] Table 3 Main chemical composition of zinc smelting dust (wt%)

[0023] element Na K Fe Cu Zn As CD Pb content 0.07 0.1 0.04 0.09 0.15 0.1 20.35 40.8

[0024] Add FeCl to the leaching solution 3 , wherein the ratio of the amount of Fe and As is 5:1, then add 10 times the theoretical amount of hydrogen peroxide, adjust the pH to 4.5 with NaOH, and filter. Add P204 extractant with a mass concentration of 30% to the filtrate, O / A=1, extraction time 10min, after static layering, separate to obtain a raffinate, the zinc removal rate reaches 96.8%. Dilute the raffinate with water to a cadmium ion concentration of 0.25mol / L, add urea at a concentration of 0.5mol / L, the ...

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Abstract

The invention discloses a method for preparing cadmium oxide from zinc smelting cadmium dust. The main steps are: adding zinc smelting cadmium dust to 30-120g / L sulfuric acid solution, and reacting at a reaction temperature of 20-80°C to obtain sulfuric acid Cadmium solution; add iron salt to the obtained cadmium sulfate solution, then add hydrogen peroxide or air for oxidation, adjust the pH value to 4~9 with sodium hydroxide, filter after precipitation, and extract the filtrate through organic phosphorus extractant to obtain zinc removal. CdSO4 solution after mixing; add urea in the solution according to the ratio of cadmium to urea in the amount of 1:1~1:7, use sodium hydroxide solution to adjust the pH to 6~11, then add it to the high-pressure reactor for hydrothermal reaction The cadmium carbonate obtained by the reaction is filtered and washed, and then roasted to prepare cadmium oxide powder. The method has the advantages of simple process, high recovery rate of cadmium and high purity of cadmium oxide.

Description

technical field [0001] The invention relates to the field of comprehensive recovery and utilization of metallurgical dust, in particular to a method for recovering cadmium from zinc smelting dust containing cadmium. Background technique [0002] my country's zinc resources are relatively rich, and the associated elements are also different. The recovery and comprehensive utilization of valuable metals in the zinc smelting industry is an important way to have a sustainable development strategy. How to comprehensively utilize resources is an urgent problem to be solved. During the zinc smelting process, the metal element cadmium is produced, which has great recovery potential. Cadmium oxide is a wide-bandgap n-type semiconductor with a direct bandgap of 2.27eV. It is a promising optoelectronic material with superior performance in conductivity and visible light transmission. It can be applied to solar cells, electroluminescent Color-changing devices, phototransistors, photodi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G11/00
CPCC01G11/00
Inventor 郑雅杰刘远孙召明
Owner CENT SOUTH UNIV
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