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Method for producing zinc oxide for ceramic glaze by using hot-dip galvanized ash

A ceramic glaze and zinc oxide technology, applied in the direction of zinc oxide/zinc hydroxide, etc., can solve problems such as serious corrosion of smelting equipment, achieve good environmental protection benefits, good economic benefits, and reduce production costs

Pending Publication Date: 2021-05-04
李发武
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, Zncl2 is extremely corrosive and severely corrodes smelting equipment

Method used

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  • Method for producing zinc oxide for ceramic glaze by using hot-dip galvanized ash
  • Method for producing zinc oxide for ceramic glaze by using hot-dip galvanized ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Embodiment 1: choose 30 hot-dip galvanizing plants zinc ash (galvanized pipe ash) comprehensive samples in Daqiuzhuang, Jinghai District, Tianjin, its zinc ash detects each component content (quality) to be respectively: Zn% is 62.14, and Pb% is 0.34, Al 2 o 3 % is 6.8%, As%2 %<0.5, CaO% is 0.11, MgO% is 0.029, Cu% is 0.011, Ni% is 0.025, Fe% is 0.40, K% is 0.016, Mn% is 0.041, Hg%<0.0005.

[0044] The preparation steps of zinc oxide are:

[0045] S1: wet ball milling

[0046] Take 500g of the sample, grind it with a small ball mill until 80% pass through a 150 mesh sieve, and control the water consumption of the ball mill at 2000ml;

[0047] S2: Filtration to remove iron

[0048]Filter and remove iron from the ball-milled slurry of S1 with a slurry iron remover;

[0049] S3: wet dechlorination

[0050] Add the iron-removed slurry in step S2 into the reaction kettle, stir, the stirrer rotates at 150r / min, add 70g of sodium hydroxide (NaOH), heat to a temperature o...

Embodiment 2

[0053] Embodiment 2: Select the galvanized pipe ash of a galvanizing plant in Yuxi, Yunnan, and its zinc ash detects that the contents (mass) of each component are respectively: Zn% is 66.51, Cl% is 12.54, ZnCO 3 % is 2.31, Fe% is 0.41, Pb% is 0.32, Cd% is 0.03, S% is 0.21, Al 2 o 3 % is 2.15. This plant produces part of the powdered metal zinc powder when plating thin tubes. The Zn% of this metal powder is 97.1%, and the C1% is 0.35. Element content is relatively high.

[0054] The preparation steps of zinc oxide are:

[0055] S1: wet ball milling

[0056] Take 500g of the sample, grind it with a small ball mill until 80% pass through a 150 mesh sieve, and control the water consumption of the ball mill at 2000ml;

[0057] S2: Filtration to remove iron

[0058] Filter and remove iron from the ball-milled slurry of S1 with a slurry iron remover;

[0059] S3: wet dechlorination

[0060] Add the iron-removed slurry in step S2 into the reaction kettle and stir at a stirrer...

Embodiment 3

[0063] Embodiment 3: choose a certain galvanizing plant tube ash in Baoding, Hebei, its zinc ash detects each component content (quality) to be respectively: Zn% is 55.18, Cl% is 14.52, Fe% is 0.25, Pb% is 0.38, Cd% is 0.48, S% is 0.23, Al 2 o 3 % is 8.78.

[0064] The preparation steps of zinc oxide are:

[0065] S1: wet ball milling

[0066] Take 500g of the sample, grind it with a small ball mill until 80% pass through a 150 mesh sieve, and control the water consumption of the ball mill at 2500ml;

[0067] S2: Filtration to remove iron

[0068] Filter and remove iron from the ball-milled slurry of S1 with a slurry iron remover;

[0069] S3: wet dechlorination

[0070] Add the slurry after iron removal in step S2 into the reaction kettle, stir, the stirrer speed is 100r / min, add 90gNa 2 CO 3 , heated to a temperature of 95°C, and reacted for 1.5 hours. Filtration and dehydration, the filter cake is washed with distilled water until the mass content of Cl ions is les...

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Abstract

The invention discloses a method for producing zinc oxide for ceramic glaze by using hot-dip galvanizing ash, which comprises the following steps: wet ball milling, filtering to remove iron, wet dechlorination, drying and calcining, wherein zinc in the hot-dip galvanizing ash is recovered in the form of zinc oxide which can be directly applied to the ceramic glaze. According to the method, the dechlorinated zinc ash is directly dried and calcined to prepare a zinc oxide product, high-temperature reduction volatilization and reoxidation are not needed, the recovery rate of zinc is increased and can reach 99%, meanwhile, a large amount of energy materials such as high-quality anthracite (or coke powder) are saved, the production cost is reduced, and good economic benefits are achieved; and the production process is clean and environment-friendly, no solid waste is generated in the whole process, no smoke is discharged, zero wastewater is discharged, good environment-friendly benefits are achieved, and the prepared zinc oxide is large in specific gravity, good in flowability, low in volatile matter and capable of being directly applied to the ceramic glaze industry.

Description

technical field [0001] The invention relates to the technical field of zinc oxide production technology, in particular to a clean, environment-friendly and high-recovery technology for producing zinc oxide for ceramic glazes with hot-dip galvanizing ash. Background technique [0002] Zinc oxide is an important raw material for ceramic chemical flux. In the ceramic industry, zinc oxide is widely used in translucent glazes for brick glazes and stoneware, and transparent glazes for craft tableware. Especially in architectural ceramic wall and floor tile glazes and low-temperature glazes, the amount is more. [0003] Zinc oxide has a strong fluxing effect in the glaze, which can reduce the expansion coefficient of the glaze, improve the thermal stability of the product, increase the gloss and whiteness of the glaze surface, improve the elasticity of the glaze, and expand the melting range while being Increases the luster of the glaze. [0004] Zinc oxide is used in raw glaze, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G9/02
CPCC01G9/02C01P2006/80
Inventor 李发武
Owner 李发武
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