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Production process for producing microcrystal alpha-alumina through microwave calcination

A production process, alumina technology, applied in the direction of alumina/aluminum hydroxide, aluminum compounds, inorganic chemistry, etc., can solve the problems of high cost, heavy pollution, high energy consumption of alumina production process, achieve less loss and reduce production cost, reducing the effect of calcining energy consumption

Active Publication Date: 2021-08-03
HENAN CHANGXING IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a production process for producing microcrystalline α-alumina by microwave calcination, so as to solve the problems of high energy consumption, large pollution and high cost in the production process of alumina in the prior art

Method used

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  • Production process for producing microcrystal alpha-alumina through microwave calcination
  • Production process for producing microcrystal alpha-alumina through microwave calcination

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Take 100Kg of alumina raw material, add a composite mineralizer and mix evenly to obtain a mixture. The composite mineralizer used includes 0.1Kg aluminum chloride, 0.1Kg aluminum fluoride, and does not contain boric acid;

[0034] (2) Put the mixed material obtained in step (1) into a ball mill and grind for 3 hours, the ball-to-material ratio is 6, and the ground material is obtained, and the particle size D50 of the ground material is measured to be 4 μm, sieved with a 200-mesh sieve, and the remaining The amount is 0.07%;

[0035] (3) Take the grinding material obtained in step (2), add 30Kg of wave absorbing agent and stir evenly with a mixer. The wave absorbing agent is 1% polyvinyl alcohol aqueous solution, and then use a press to extrude under the condition of 60MPa , to produce alumina green body;

[0036] (4) Dry the alumina green body prepared in step (3) in an oven at 100°C for 1 hour, and measure its moisture content to be 26.7%;

[0037] (5) Send the...

Embodiment 2

[0040] (1) Take 100Kg of alumina raw material, add a composite mineralizer and mix evenly to obtain a mixture. The composite mineralizer used includes 0.01Kg calcium chloride, 0.01Kg boric acid, and does not contain fluoride;

[0041] (2) Put the mixed material obtained in step (1) into a ball mill and grind for 3 hours, the ball-to-material ratio is 5, and the grinding material is obtained. The particle size D50 of the grinding material is measured to be 7 μm, and the sieve is sieved with a 200-mesh sieve. The amount is 0.34%;

[0042](3) Take the grinding material obtained in step (2), add 25Kg of wave absorbing agent and stir evenly with a mixer. The wave absorbing agent is 1% carboxymethyl cellulose aqueous solution, and then use a press to squeeze Press forming to produce alumina green body;

[0043] (4) Dry the alumina green body prepared in step (3) in an oven at 80°C for 2 hours, and measure its moisture content to be 22.3%;

[0044] (5) Send the dried brick material...

Embodiment 3

[0047] (1) Take 100Kg of alumina raw material, add a composite mineralizer and mix evenly to obtain a mixture. The composite mineralizer used includes 0.01Kg magnesium chloride, 0.01Kg calcium fluoride, and 0.01Kg boric acid;

[0048] (2) Put the mixed material obtained in step (1) into a ball mill and grind for 3 hours, the ball-to-material ratio is 4, and the grinding material is obtained. The particle size D50 of the grinding material is measured to be 11 μm, and sieved with a 200-mesh sieve. The amount is 0.77%;

[0049] (3) Take the grinding material obtained in step (2), add 20Kg of wave absorbing agent and stir evenly with a mixer. The wave absorbing agent is a lignin aqueous solution with a concentration of 1%, and then use a press to extrude under the condition of 40MPa. Prepare alumina green body;

[0050] (4) Dry the alumina green body prepared in step (3) in an oven at 50°C for 2 hours, and measure its moisture content to be 17.7%;

[0051] (5) Send the dried bri...

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Abstract

The invention discloses a production process for producing microcrystal alpha-alumina through microwave calcination, belonging to the technical field of production processes for calcined alumina. The production process specifically comprises the following steps: (1) adding a composite mineralizer into an alumina raw material, and conducting uniform mixing to obtain a mixture; (2) putting the mixture into a ball mill for ball milling so as to obtain a ground material; (3) adding a wave-absorbing agent with a certain proportion into the ground material, conducting uniform stirring, and then performing extruding by using a press machine to prepare a green body of alumina; (4) drying the green body of aluminato adjust a water content in the green body of alumina; (5) feeding the dried green body of alumina into a microwave kiln, heating the microwave kiln to a set temperature, and conducting calcining for a certain time to obtain alpha-alumina clinker; and (6) crushing the alpha-alumina clinker to obtain the microcrystal alpha-alumina. According to the invention, product quality is stable, product yield is higher than product yield of a traditional kiln production mode, energy consumption during alpha-alumina preparation can be greatly reduced, and zero emission of harmful gas is achieved.

Description

technical field [0001] The invention relates to the technical field of calcined alumina production technology, in particular to the production technology of microcrystalline α-alumina produced by microwave calcination. Background technique [0002] α-alumina, also known as calcined alumina, has the advantages of high melting point and high hardness. It is the most stable phase state among all phases of alumina. It is widely used in many fields such as refractory materials, glass and chemical materials. α-alumina is generally They are all produced by traditional kilns such as tunnel kilns and downdraft kilns, but the calcination of traditional kilns requires a large amount of energy such as fuel oil, natural gas, and electric energy. The heating method is traditional radiation or heat conduction, and its heat utilization efficiency is only 10 % to 30%, the energy utilization rate is not high, and some fuels will produce a large amount of polluting gas after burning, which nee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02C01F7/021
CPCC01F7/021C01P2004/61C01P2004/62C01P2004/03C04B35/6261C04B2235/3217C04B2235/606C04B35/111C04B2235/445C04B2235/444C04B2235/3409C04B2235/5436C04B35/6365C04B35/63416C04B2235/3218C04B2235/322C04B2235/604C04B2235/3206C04B2235/3208C04B2235/667C04B2235/6562C04B35/10
Inventor 孙志昂梁飞飞蒋晓辉董博王倩张冬梅王俊健薛亚楠徐志凯王放杨彦军李明菁邵梅珊
Owner HENAN CHANGXING IND CO LTD
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