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Production process for calcinating secondary zinc oxide

A secondary zinc oxide and production process technology, applied in the direction of zinc oxide/zinc hydroxide, etc., can solve the problems of dust pollution, site occupation, air pollution, etc., and achieve the effect of good effect and low cost

Inactive Publication Date: 2019-07-05
徐州市正峰锌业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] If the zinc-containing waste slag produced by metal smelting and mineral processing is piled up in the waste slag yard, one will occupy the site, and two, part of the smelting waste slag contains relatively high non-ferrous metal dust, which will cause serious dust pollution and Heavy metal pollution; harmful components in some finer zinc-containing waste residues are easier to dissolve, causing pollution to the surrounding groundwater and air pollution. It can be seen that zinc-containing waste residues have great pollution risks to the environment. Hazardous treatment is particularly necessary

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A production process for calcined zinc oxide, comprising the following steps:

[0021] (1) The zinc-containing waste residue is leached with dilute sulfuric acid, and filtered; the concentration of dilute sulfuric acid is 20%, and the leaching time is 2h;

[0022] (2) Add hydrogen peroxide to the filtrate, and filter; the amount of hydrogen peroxide is 1 / 10 of the volume of the filtrate, and the dropwise addition is completed in 10 minutes. During the dropwise addition, keep stirring and keep the temperature at 30°C;

[0023] (3) add saturated sodium hydroxide solution in filtrate, generate zinc hydroxide slurry; The volume of saturated sodium hydroxide solution is 1 / 10-1 / 4 of filtrate volume;

[0024] (4) After the slurry is mixed with lime, it is sent to the calciner for calcination, and the amount of lime added is 1 / 10-1 / 5 of the quality of the zinc waste residue;

[0025] (5) Collect gas-phase volatiles, and obtain sub-zinc oxide after cooling; calcining temperatur...

Embodiment 2

[0027] A production process for calcined zinc oxide, comprising the following steps:

[0028] (1) The zinc-containing waste residue is leached with dilute sulfuric acid, and filtered; the concentration of dilute sulfuric acid is 30%, and the leaching time is 1.5h;

[0029] (2) Add hydrogen peroxide to the filtrate, and filter; the amount of hydrogen peroxide is 1 / 8 of the volume of the filtrate, and the dropwise addition is completed in 20 minutes. During the dropwise addition, keep stirring and keep the temperature at 35°C;

[0030] (3) add saturated sodium hydroxide solution in filtrate, generate zinc hydroxide slurry; The volume of saturated sodium hydroxide solution is 1 / 10-1 / 4 of filtrate volume;

[0031] (4) After the slurry is mixed with lime, it is sent to the calciner for calcination, and the amount of lime added is 1 / 10-1 / 5 of the quality of the zinc waste residue;

[0032] (5) Collect gaseous volatiles, and obtain subzinc oxide after cooling; calcining temperature ...

Embodiment 3

[0034] A production process for calcined zinc oxide, comprising the following steps:

[0035] (1) The zinc-containing waste residue is leached with dilute sulfuric acid, and filtered; the concentration of dilute sulfuric acid is 30%, and the leaching time is 1.5h;

[0036] (2) Add hydrogen peroxide to the filtrate, and filter; the amount of hydrogen peroxide is 1 / 7 of the volume of the filtrate, and the dropwise addition is completed in 20 minutes. During the dropwise addition, keep stirring and keep the temperature at 40°C;

[0037] (3) add saturated sodium hydroxide solution in filtrate, generate zinc hydroxide slurry; The volume of saturated sodium hydroxide solution is 1 / 10-1 / 4 of filtrate volume;

[0038] (4) After the slurry is mixed with lime, it is sent to the calciner for calcination, and the amount of lime added is 1 / 10-1 / 5 of the quality of the zinc waste residue;

[0039] (5) Collect gaseous volatiles, and obtain subzinc oxide after cooling; calcining temperature ...

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PUM

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Abstract

The invention discloses a production process for calcinating secondary zinc oxide. The process includes the following steps of firstly, leaching zinc-containing waste residues with dilute sulphuric acid, and conducting filtering; secondly, adding hydrogen peroxide to filtrate, and conducting filtering; thirdly, adding a saturated sodium hydroxide solution to the filtrate to generate zinc hydroxideslurry; fourthly, mixing the slurry with lime, and sending the mixture to a calcinator to be calcinated; fifthly, collecting gas-phase volatile, and conducting cooling to obtain the secondary zinc oxide. The secondary zinc oxide preparing method can effectively remove impurities in the secondary zinc oxide and is low in operating cost.

Description

technical field [0001] The invention relates to the technical field of metallurgy and chemical industry, in particular to a production process for calcining secondary zinc oxide. Background technique [0002] If the zinc-containing waste slag produced by metal smelting and mineral processing is piled up in the waste slag yard, one will occupy the site, and two, part of the smelting waste slag contains relatively high non-ferrous metal dust, which will cause serious dust pollution and Heavy metal pollution; harmful components in some finer zinc-containing waste residues are easier to dissolve, causing pollution to the surrounding groundwater and air pollution. It can be seen that zinc-containing waste residues have great pollution risks to the environment. Hazardous treatment is particularly necessary. Contents of the invention [0003] The object of the present invention is to provide a production process for calcining secondary zinc oxide that can reduce cost and has goo...

Claims

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Application Information

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IPC IPC(8): C01G9/02
CPCC01G9/02
Inventor 李子岩
Owner 徐州市正峰锌业有限公司
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