Method for preparing spherical Bayer stones

A Bayerite, spherical technology, applied in the field of preparing spherical Bayerite, can solve the problems of irregular shape of Bayerite, high cost of alumina, uneven particle size, etc., achieve shortened decomposition time, low content of alkaline ions and sodium ions, and particle size The effect of uniform diameter

Inactive Publication Date: 2012-05-02
INST OF PROCESS ENG CHINESE ACAD OF SCI
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Problems solved by technology

[0006] The present invention aims at the problems of high cost and high energy consumption of alumina produced by the sintering method in my country, and the problems that the currently prepared Bayerite has no regular shape and non-uniform particle size, and proposes a new method for producing spherical Bayerite by sintering sodium aluminate semen. craft

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  • Method for preparing spherical Bayer stones
  • Method for preparing spherical Bayer stones
  • Method for preparing spherical Bayer stones

Examples

Experimental program
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Effect test

Embodiment 1

[0043] The sodium aluminate semen after desilication in industrial alumina production is evaporated to the composition: Na 2 O 150g / L, Al 2 o 3 164.5g / L, molecular ratio 1.5. Dissolve 150 g of sodium bicarbonate in 3000 mL of deionized water to obtain a 50 g / L aqueous solution of sodium bicarbonate. Add the aqueous sodium bicarbonate solution and sodium aluminate solution continuously at a rate of 4.61 mL / min and 1.12 mL / min for continuous crystallization In the reactor, the molar ratio of sodium bicarbonate to sodium aluminate is 1.01:1. The reaction process is carried out in a constant temperature water bath at 50°C, with an average residence time of 90min. After the reaction reaches a steady state, the solid-liquid mixture is carried out. Separate, wash the solid phase with hot water until the washing solution is neutral, and dry at 100°C for 24 hours to obtain Bayerite products, such as figure 2 As shown, the obtained product is a regular spherical shape with uniform p...

Embodiment 2

[0045] Mix 50g / L aqueous sodium bicarbonate solution and sodium aluminate solution (Na 2 O 150g / L, Al 2 o 3 164.5g / L, molecular ratio 1.5) was dripped continuously in the continuous reaction crystallizer with the speed of 4.26mL / min and 1.17mL / min respectively, the molar ratio of sodium oxide in sodium bicarbonate and sodium aluminate is 0.90:1, The process is carried out in a constant temperature water bath at 40°C, with an average residence time of 90 minutes. After the reaction reaches a steady state, the solid-liquid mixture is separated, and the solid phase is washed with hot water until the washing liquid is neutral, and dried at 100°C for 24 hours, namely To obtain spherical Bayerite products, such as image 3 As shown, the obtained product is a regular spherical shape with uniform particle size distribution. The decomposition mother liquor reacts with carbon dioxide gas to obtain sodium bicarbonate solution again.

Embodiment 3

[0047] Mix 100g / L aqueous sodium bicarbonate solution and sodium aluminate solution (Na 2 O 200g / L, Al 2 o 3 164.5g / L, molecular ratio 2.0) is dripped continuously in the continuous crystallization reactor with the speed of 4.38mL / min and 1.16mL / min respectively, and the mol ratio of sodium oxide in sodium bicarbonate and sodium aluminate is 1.39: 1, The process is carried out in a constant temperature water bath at 50°C, with an average residence time of 90 minutes. After the reaction reaches a steady state, the solid-liquid mixture is separated, and the solid phase is washed with hot water until the washing liquid is neutral, and dried at 100°C for 24 hours, namely To obtain spherical Bayerite products, such as Figure 4 As shown, the obtained product is a regular spherical shape with uniform particle size distribution. The decomposition mother liquor reacts with carbon dioxide gas to obtain sodium bicarbonate solution again.

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Abstract

The invention relates to a method for preparing spherical Bayer stones. The method comprises steps that: (1) an aqueous solution of sodium bicarbonate and a sodium aluminate solution are respectively added into a continuous crystallization reactor; a reaction is carried out under a temperature of 40-60 DEG C, and an average residence time is 45-90min; when the reaction reaches a steady state, a Bayer stone solid suspension solution is obtained, wherein the adding speed of the aqueous solution of sodium bicarbonate is 4.26-8.7mL/min; the adding speed of the sodium aluminate solution is 1.1-2.9mL/min; and the molar ratio of sodium bicarbonate to sodium oxide in aluminate is 0.90:1-2.59:1; (2) the suspension solution obtained in the step (1) is subject to solid-liquid separation; a solid phase and a liquid phase are collected; the solid phase is washed and dried, such that a Bayer stone product is obtained; (3) carbon dioxide gas is delivered to the liquid phase obtained in the step (2),such that a sodium bicarbonate solution is obtained; the produced sodium bicarbonate solution is used in the step (1), and the steps (1)-(3) are repeated. The method provided by the invention is advantaged in that: with the method, the prepared Bayer stones have regular spherical shapes and uniform particle distribution.

Description

technical field [0001] The invention relates to the field of Bayerite production, in particular, the invention relates to a method for preparing spherical Bayerite, that is, a method for preparing spherical Bayerite from industrial sodium aluminate semen by using sodium bicarbonate. Background technique [0002] Gibbsite and bayerite are the two most common aluminum hydroxide trihydrate (Al 2 o 3 ·3H 2 O) polymorphs. Industrial Gibbsite is mostly an intermediate product in the production of alumina by Bayer method or sintering method, and is generally calcined to obtain metallurgical grade alumina. [0003] When industrially preparing alumina by sintering method, first, bauxite and a certain amount of soda ash, lime (or limestone) are made into furnace charge and sintered at high temperature, and alumina and soda ash are combined to form water-soluble solid sodium aluminate , when the sintered product (clinker) is dissolved with a dilute alkali solution, the solid sodium...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/14
Inventor 张亦飞李艳张懿
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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