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Process for producing pure cadmium by continuous reduction and distillation of zinc cadmium slag and sponge cadmium

A technology of sponge cadmium and zinc cadmium, which is applied in the direction of improving process efficiency, can solve the problems of consuming sulfuric acid and zinc powder, high equipment investment and high energy consumption, so as to achieve no zinc loss, less equipment investment and high recovery rate. Effect

Active Publication Date: 2013-09-25
长沙科力威蒸馏技术有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the production process, a large amount of alkali slag pollutes the environment, all zinc in the sponge cadmium is lost, sulfuric acid and zinc powder are consumed, equipment investment is high, energy consumption is high, and some rare and valuable metals enter the alkali slag and cannot be recovered

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0010] Take 1000kg of zinc and cadmium slag as raw material to produce refined cadmium as an example:

[0011] 1. Put the raw materials in a vacuum drying equipment, and carry out drying and dehydration at a temperature of 105°C to 120°C until the moisture content is less than 0.5%.

[0012] 2. Add reducing agent carbon to the 700kg powdery raw material obtained after drying and dehydration, mix well, place in a continuous reduction distillation furnace, and carry out reduction smelting and evaporation at a high temperature of 1000 ° C to 1200 ° C to complete the reduction reaction CdO+ZnO +C→Cd+Zn+CO, zinc and cadmium vapors are condensed to obtain a zinc-cadmium alloy, the zinc-cadmium alloy contains 40% zinc and 60% cadmium, and the amount of reducing agent carbon is calculated according to the reaction equation, and then excess 10%, a total of 35kg of carbon needs to be added.

[0013] 3. Place the zinc-cadmium alloy obtained above in a tower rectification furnace for rec...

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PUM

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Abstract

The invention discloses a process for producing pure cadmium by continuous reduction and distillation of zinc cadmium slag and sponge cadmium, which is characterized by comprising the process flows of vacuum drying, continuous reduction and distillation, continuous tower rectification, refining and zinc removal. The process has the advantages of simple process, low equipment investment, no zinc loss, high reclamation rate of rare valuable metals, low cost and no slag pollution during coarse smelting, and is a slag-free smelting new process for the cadmium.

Description

technical field [0001] The invention relates to a production method of metal cadmium, in particular to a process for producing refined cadmium by continuous reduction distillation of zinc cadmium slag and sponge cadmium. Background technique [0002] Zinc and cadmium slag will be produced in the purification and impurity removal process of the zinc hydrometallurgy process. The zinc and cadmium contents range from 10% to 40%. The cadmium in the cadmium is replaced with zinc powder to obtain sponge cadmium containing 10% to 15% zinc. After the sponge cadmium is compacted, it is reduced and smelted in molten sodium hydroxide to obtain crude cadmium, and a large amount of zinc-containing alkali slag is produced. Distilled to get refined cadmium. In the production process, a large amount of alkali slag pollutes the environment, all zinc in the sponge cadmium is lost, sulfuric acid and zinc powder are consumed, equipment investment is high, energy consumption is high, and some ra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B19/30C22B17/00
CPCY02P10/20
Inventor 赵志强
Owner 长沙科力威蒸馏技术有限公司