A kind of zinc leaching slag volatilization kiln treatment method

A technology of zinc leaching slag and treatment method, applied in the field of metallurgy, can solve the problems of insufficient and effective utilization of red mud, occupation of land, environmental pollution, etc., and achieve the effects of improving service life, reducing the generation of zinc sulfide, and reducing production costs.

Active Publication Date: 2021-06-01
HECHI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

A large amount of red mud cannot be fully and effectively utilized, so it can only be piled up in large-scale storage yards, which takes up a lot of land, and also causes serious pollution to the environment, causing many direct and indirect impacts on human production and life. Therefore, it is imminent to reduce the output and harm of red mud to the greatest extent, and realize multi-channel and large-scale resource utilization.

Method used

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  • A kind of zinc leaching slag volatilization kiln treatment method
  • A kind of zinc leaching slag volatilization kiln treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A method for treating zinc leaching slag in a volatilization kiln, comprising the steps of:

[0029] (1) Take zinc leaching slag, Zn18%, Fe22%, SiO 2 9%, Pb3.5%, S4%, Ca1%, Mg2.5%, water content 20%, and the rest are impurities; the above-mentioned zinc leaching slag is dried to a water content of 8%, and ground to obtain a particle size of 100 μm Zinc leaching slag scrap;

[0030] (2) pulverizing the anthracite into coal powder with a particle diameter of 2 mm;

[0031] (3) Take the following mass fraction of alumina waste red mud, Fe 2 o 3 : 16%, SiO 2 : 15%, Al 2 o 3 : 20%, Na 2 O: 8%, and the rest are impurities; the above-mentioned alumina waste red mud is dried to a moisture content of 10%, and ground to obtain red mud powder with a particle size of 1 mm;

[0032] (4) The above-mentioned zinc leaching slag fragments, coal powder, red mud powder, and limestone powder with a particle size of 1mm are mixed evenly in a mass ratio of 100:30:35:1, and water is a...

Embodiment 2

[0035] A method for treating zinc leaching slag in a volatilization kiln, comprising the steps of:

[0036] (1) Take the following zinc leaching slag in mass fraction, Zn17%, Fe22.5%, SiO 2 9.5%, Pb3%, S4.2%, Ca2%, Mg1.8%, water content 18%, and the rest are impurities; the above-mentioned zinc leaching slag is dried to a water content of 7%, and ground to obtain a particle size of 125 μm Zinc leaching slag scrap;

[0037] (2) pulverizing the anthracite into coal powder with a particle size of 2.8mm;

[0038] (3) Take the following mass fraction of alumina waste red mud, Fe 2 o 3 : 18%, SiO 2 : 12%, Al 2 o 3 : 18%, Na 2 O: 7%, and the rest are impurities; the above-mentioned alumina waste red mud is dried to a moisture content of 9%, and ground to obtain red mud powder with a particle size of 1.2mm;

[0039] (4) The above-mentioned zinc leaching slag fragments, coal powder, red mud powder and limestone powder with a particle size of 1.5mm are mixed uniformly in a mass ...

Embodiment 3

[0042] A method for treating zinc leaching slag in a volatilization kiln, comprising the steps of:

[0043] (1) Take the following zinc leaching slag in mass fraction, Zn16.4%, Fe23%, SiO 2 10%, Pb3.6%, S4.5%, Ca2.4%, Mg1.2%, water content 19%, and the rest are impurities; the above-mentioned zinc leaching slag is dried to a water content of 6.8%, and ground to obtain Zinc leaching slag fragments with a particle size of 150 μm;

[0044] (2) pulverizing the anthracite into coal powder with a particle size of 3.5 mm;

[0045] (3) Take the following mass fraction of alumina waste red mud, Fe 2 o 3 : 20%, SiO 2 : 10%, Al 2 o 3 : 17%, Na 2 O: 6%, and the rest are impurities; the above-mentioned alumina waste red mud is dried to a moisture content of 8%, and ground to obtain red mud powder with a particle size of 1.5 mm;

[0046] (4) The above-mentioned zinc leaching slag fragments, coal powder, red mud powder and limestone powder with a particle size of 2mm are mixed evenly...

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Abstract

The invention discloses a method for treating zinc leaching slag volatilization kiln. After mixing zinc leaching slag fragments, coal powder, red mud powder and limestone powder, adding water to form pellets, the pellets enter from the tail of the volatilization kiln and pass through the drying zone in sequence. , preheating zone, volatilization zone and cooling zone, and blow in oxygen-enriched air, so that the generated flue gas passes through the settling bin-waste heat boiler-cyclone separator-electric dust collector in sequence, and collects waste heat boiler, cyclone separator, electric dust collector The solid particles in the dust collector get coarse zinc oxide, and finally the tail gas discharged from the electric dust collector is emptied, and the kiln slag is discharged from the head of the volatilization kiln. The invention solves the problem of massive accumulation of zinc leaching slag and alumina waste red mud to pollute the environment, reduces the cost of stacking management, and realizes the utilization of zinc leaching slag and alumina waste red mud, and the concentration of zinc and lead in zinc leaching slag The removal rate is more than 97%, which provides a new idea for environmental governance and solving the hidden problems of lead pollution, and has a good application prospect.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a method for treating zinc leaching slag in a volatilization kiln. Background technique [0002] my country is a country with a large zinc production, and a large amount of zinc leaching slag is discharged every year. So far, the common practice in China is to mix zinc leaching slag with a certain amount of coal powder into the rotary kiln, and volatilize the zinc and part of silver, indium and other metals in the slag at a temperature of 1100-1300 °C. In the process of treating zinc leaching slag in the rotary kiln process, due to the addition of a large amount of coke and additives, the output of kiln slag is relatively large. Because the content of heavy metals still exceeds the standard, most of the slag is directly stored, and a small amount is transported to the cement plant, resulting in Waste of resources. The iron recovery, silver recovery and lead-zinc recovery of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/24C22B19/00C22B13/00C22B7/00
CPCC22B1/2406C22B7/00C22B13/00C22B19/00Y02P10/20
Inventor 黄育飞苏安王波廖树德兰自勉
Owner HECHI UNIV
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