Method for enriching and recycling cadmium from lead smelting system

A lead smelting and enrichment technology, applied in the direction of improving process efficiency, can solve the problems of high production cost, difficult enrichment and separation, unreasonable economy, etc., and achieves short enrichment and separation process, efficient enrichment and separation, and economic benefits. significant effect

Active Publication Date: 2014-04-23
HENAN YUGUANG GOLD & LEAD
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  • Claims
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AI Technical Summary

Problems solved by technology

It can be seen that when recovering cadmium from the lead smelting system, the traditional process is long, the cadmium is seriously dispersed, the enrichment and separation are difficult, the heavy metal pollution is large, a large number of chemical reagents are used, the production cost is high, and the metal recovery rate is low.
[0004] At present, bottom-blowing furnace oxidation-blast furnace (reduction furnace) reduction lead smelting process is widely used in China. Most of the cadmium-containing materials produced by high-temperature smelting are rich in lead and zinc. Some companies sell this part of cadmium-containing materials to zinc smelters to recover cadmium. , when this kind of high-cadmium-containing lead-zinc soot is sold, neither cadmium nor zinc is priced, only the price of lead is calculated, which makes this method of recycling cadmium poor in economic benefits, economically unreasonable, and loses a certain amount of lead metal , zinc smelters also bear the risk of heavy metal lead pollution

Method used

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  • Method for enriching and recycling cadmium from lead smelting system

Examples

Experimental program
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Effect test

Embodiment 1

[0040] Example 1: After 10 tons of lead concentrate is mixed with 0.5-1 tons of quartz, 0.5-1 tons of stones and 1-2 tons of low-cadmium smoke, it is added to the bottom blowing furnace, and the bottom of the furnace is blown into the furnace with an oxygen lance at a pressure of 0.6-1.0 Oxygen and nitrogen at MPa, where the amount of blown oxygen is 1200 m 3 , the amount of nitrogen is 0.3 times that of oxygen, and the temperature in the furnace is kept at 1100°C. After the reaction, high-lead slag, crude lead, and high-temperature SO2 flue gas dust are produced. After 280-350°C, 1 ton of ESP soot containing 20% ​​cadmium is obtained after passing through the electrostatic precipitator; the obtained 1 ton of ESP soot containing 20% ​​cadmium is added to water for leaching, and the leaching conditions : The liquid-solid ratio is 4:1, the temperature is about 30°C, and the time is 2 hours. After the leaching is completed, 0.7 tons of leaching residue and 4m of leaching solutio...

Embodiment 2

[0041] Example 2: Example 1: After 10 tons of lead concentrate is mixed with 0.5-1 tons of quartz, 0.5-1 tons of stones and 1-2 tons of low-cadmium smoke, it is added to the bottom blowing furnace, and the bottom of the furnace is blown into the pressure by an oxygen lance. Oxygen and nitrogen at 1MPa, the amount of oxygen blown into it is 1000 m 3 , the amount of nitrogen is 0.4 times that of oxygen, and the temperature in the furnace is kept at 1100°C. After the reaction, high-lead slag, crude lead, and high-temperature SO2 flue gas dust are produced. After 300°C, 1 ton of ESP soot containing 20% ​​cadmium is obtained after passing through the electrostatic precipitator; the obtained 1 ton of ESP soot containing 20% ​​cadmium is added to the concentration of 0.2-1% Leach in dilute sulfuric acid, leaching conditions: liquid-solid ratio 4:1, temperature around 30°C, time 2 hours. After the leaching is completed, 0.7 tons of leaching residue and 4m of leaching solution are...

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Abstract

The invention belongs to a non-ferrous metal metallurgy industry and particularly relates to a method for enriching and recycling cadmium from a lead smelting system. The method comprises the following steps: matching a lead concentrate with auxiliary materials and returned low-cadmium smoke and dust, and adding desulfurization smelting lea of a bottom blowing furnace; circularly enriching the cadmium in electric dust-collection smoke and dust in a form of cadmium sulfate; when the cadmium content of the electric dust-collection smoke and dust is 5%-28%, leaching by using water or dilute sulfuric acid to separate the cadmium; displacing a leaching solution by using zinc powder to produce cadmium sponge and further producing rough cadmium and fine cadmium; and taking a solution obtained by displacing the cadmium as a raw material for producing nano zinc oxide, zinc sulfate monohydrate and zinc sulfate heptahydrate to recycle zinc. The lead is enriched in leached dreg in a leaching process so that the lead can be conveniently returned back to a lead system to be smelted and recycled. According to the method, a bottom blowing smelting technology is adopted; when the lead is smelted, the cadmium in the raw material is efficiently enriched and converted into a water-soluble cadmium salt; a technological process is shortened and conditions for directly enriching, separating and recycling the lead and the cadmium are provided; the dispersion of the lead when the cadmium is recycled by a wet method is avoided and the production cost is reduced.

Description

technical field [0001] The invention belongs to the nonferrous metal smelting industry, in particular to a method for enriching and recovering cadmium from a lead smelting system. Background technique [0002] At present, cadmium metal is mainly recovered comprehensively from the zinc smelting system. The main recovery process is: the zinc sulfide concentrate is roasted, so that zinc and cadmium enter the calcine in the form of oxide and sulfate, and when the calcine is acid leached, the zinc and Cadmium enters the solution in the form of sulfate. Harmful metals in the solution need to be removed before zinc electrowinning. The main method for removing cadmium is to add zinc powder for replacement, and produce copper and cadmium replacement slag; then use dilute sulfuric acid or zinc electrowinning solution for oxidative leaching Copper cadmium replacement slag, the output copper cadmium slag leaching solution is replaced twice with zinc powder to remove cadmium, the first s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B17/00C22B7/02C22B13/02
CPCY02P10/20
Inventor 李卫锋狄聚才蒋丽华王光明李武科王成伟王海涛杨明
Owner HENAN YUGUANG GOLD & LEAD
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