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Technology for recovering lead, zinc, carbon, silver and iron from zinc smelting leaching residues

A leaching slag and zinc smelting technology, which is applied in the technical field of carbon, silver, zinc, lead recovery and iron recovery, can solve the problems of difficult recovery of valuable minerals, pollution of the environment, difficult microbial degradation, etc., and achieve the effect of easy industrialization

Inactive Publication Date: 2018-09-14
JIANGXI UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a process for recovering lead, zinc, carbon, silver, and iron from zinc smelting leaching slag, so as to solve the problem that the leaching slag in the prior art is highly toxic and difficult to be degraded by microorganisms, and the valuable minerals contained therein are difficult to Recycling creates a waste of resources and seriously pollutes the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A process for recovering lead, zinc, carbon, silver and iron from zinc smelting leaching slag, comprising the steps of:

[0039] Step 1, lead and zinc recovery:

[0040] Take the leaching slag, which contains 182g / t of silver, 6.60% of lead, and 3.50% of zinc. The ratio of leaching slag, reducing agent coke and additive lime is 1:0.35:0.15. After mixing, it is roasted at 900°C to collect the amount of lead and zinc. Volatile soot, the volatilization rates of lead and zinc are 93.52% and 92.56% respectively;

[0041] Step 2, water quenching of kiln slag:

[0042] The kiln slag after high-temperature roasting is subjected to water quenching and quenching and then wet grinding-classification operation. The grinding concentration is 50%, the concentration of the classification overflow pulp is 35%, and the classification fineness requirement is less than 0.074mm. The content is 65%.

[0043] Step 3, kiln slag carbon selection:

[0044] Add 500g / t carbon collector to the ...

Embodiment 2

[0050] Step 1, lead and zinc recovery:

[0051] Take the leaching slag, which contains 165.20g / t of silver, 5.60% of lead, and 4.42% of zinc. The ratio of leaching slag and reducing agent anthracite is 1:0.6. No additives are added. After mixing, it is roasted at a high temperature of 1200°C to collect the Volatile soot, the volatilization rates of lead and zinc are 93.25% and 91.74% respectively;

[0052] Step 2, water quenching of kiln slag:

[0053] The kiln slag after high-temperature roasting is subjected to water quenching and quenching and then wet grinding-classification operation. The grinding concentration is 80%, the concentration of the classified overflow pulp is 30%, and the classification fineness requirement is less than 0.074mm. The content is 90%.

[0054] Step 3, kiln slag carbon selection:

[0055] Add 1500g / t carbon collector to the slurry obtained in step 2, and obtain carbon concentrate and floating carbon tailings after roughing, beneficiation, and sc...

Embodiment 3

[0060] Step 1, lead and zinc recovery:

[0061] Take the leaching slag, which contains 172.20g / t of silver, 6.63% of lead, and 4.58% of zinc. The ratio of leaching slag, reducing agent semi-coke and additive (lime:limestone=0.6:0.4) is 1:0.45:0.15. Roasting at a high temperature of 1100°C, collecting the volatilized fumes of lead and zinc, and obtaining the volatilization rates of lead and zinc as 95.35% and 93.28% respectively;

[0062] Step 2, water quenching of kiln slag:

[0063] The kiln slag after high-temperature roasting is subjected to water quenching and quenching and then wet grinding-classification operation. The grinding concentration is 70%, the concentration of the graded overflow pulp is 35%, and the graded fineness requirement is less than 0.074mm. The content is 85%.

[0064] Step 3, kiln slag carbon selection:

[0065] Add 900g / t carbon collector to the slurry obtained in step 2, and obtain carbon concentrate and floating carbon tailings after roughing, be...

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Abstract

The invention discloses a technology for recovering lead, zinc, carbon, silver and iron from zinc smelting leaching residues, and belongs to the technical field of hydrometallurgy and mineral processing. The technology comprises the following steps of recovering the lead and the zinc; carrying out water quenching on kiln slags; carrying out carbon concentration on the kiln slags; carrying out silver concentration on the kiln slags; and carrying out iron concentration on the kiln slags. According to the technology, the valuable elements in the leaching residues can be comprehensively recoveredto the maximum extent, hazardous waste can be converted into general waste, a high-temperature reduction (volatilization) roasting metallurgical process and a flotation and magnetic separation beneficiation process are mainly adopted, a rotary kiln is applied to carry out the high-temperature reduction (volatilization) roasting metallurgical process, so that the components of the lead and the zinccan be recovered from the leaching residues, the kiln slags of the rotary kiln is ground to a certain fineness, then the flotation and magnetic separation beneficiation process is adopted, so that coke, silver-contained minerals and iron minerals in the slags can be recovered, and tailings with the valuable components recovered mainly contain nonmetallic minerals such as silicate and can serve asingredient for cement production for sale, so that harmless treatment of the tailings can be realized.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy and mineral processing, in particular to a process for recovering lead, zinc, carbon, silver and iron from zinc smelting leaching slag. Background technique [0002] At present, about 80% of the world's zinc is obtained through hydrometallurgy, and its principle process is mostly based on "roasting-leaching-electrodeposition", which is also the mainstream process of zinc smelting in my country. , In the above-mentioned zinc smelting process, according to the treatment method of leaching slag, it is divided into conventional leaching process and high-temperature high-acid leaching process, and the leaching slag after high-temperature and high-acid leaching process is leaching slag. About every ton of electrolytic zinc will produce 0.4-0.8 tons of leaching residue. The slag contains zinc and other valuable metals (lead, copper, indium, gold, silver and other valuable metals), but due to the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B1/02C22B13/02C22B19/30C22B19/20C22B11/02
CPCC22B1/02C22B7/001C22B11/021C22B13/025C22B19/20C22B19/30Y02P10/20
Inventor 李国栋郭艳华彭贵熊彭建城廖雪珍
Owner JIANGXI UNIV OF SCI & TECH
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