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A kind of preparation method of pseudo-boehmite

A pseudo-boehmite, aluminum sulfate technology, applied in chemical instruments and methods, aluminum compounds, inorganic chemistry, etc., to achieve the effects of good bonding performance, good glue-forming performance and high glue viscosity

Active Publication Date: 2022-01-14
湖南约瑟夫科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the current demand for pseudo-boehmite used in the production of ceramic corundum abrasives, and provides a special pseudo-boehmite for ceramic corundum abrasives and a preparation method thereof

Method used

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  • A kind of preparation method of pseudo-boehmite
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  • A kind of preparation method of pseudo-boehmite

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Experimental program
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Effect test

Embodiment 1

[0031] A method for preparing pseudo-boehmite special for ceramic corundum abrasives, comprising the steps of:

[0032] (1) Preparation of sodium metaaluminate solution for the production of pseudo-boehmite specially used for ceramic corundum abrasives: 32% sodium hydroxide solution and Al 2 o 3 Aluminum hydroxide powder with a content of 62.7% was added to the reactor with stirring to control the Al 2 o 3 :Na 2 O molar ratio is 1:1.35; Reaction pressure is 0.2MPa; Reaction temperature is 120 ℃, and the reaction time is 6 hours, prepares the sodium metaaluminate solution that ceramic corundum abrasive special-purpose pseudo-boehmite is produced;

[0033] (2) Prepare Al 2 o 3 The sodium metaaluminate solution with a concentration of 20g / L and the prepared Al 2 o 3 The aluminum sulfate solution with a concentration of 20g / L is added to a stirred reactor at a volume ratio of 0.4:1. The reaction temperature is 33°C. The reacted slurry is transferred to another gas-liquid re...

Embodiment 2

[0042] A method for preparing pseudo-boehmite special for ceramic corundum abrasives, comprising the steps of:

[0043] (1) Preparation of sodium metaaluminate solution for the production of pseudo-boehmite specially used for ceramic corundum abrasives: 32% sodium hydroxide solution and Al 2 o3 Aluminum hydroxide powder with a content of 62.7% was added to the reactor with stirring to control the Al 2 o 3 :Na 2 O molar ratio is 1:1.45; Reaction pressure is 0.2MPa; Reaction temperature is 125 ℃, and the reaction time is 6 hours, prepares the sodium metaaluminate solution that ceramic corundum abrasive material special-purpose pseudo-boehmite is produced;

[0044] (2) Prepare Al 2 o 3 The sodium metaaluminate solution with a concentration of 50g / L and the prepared Al 2 o 3 The aluminum sulfate solution with a concentration of 50g / L is added to a stirred reactor at a volume ratio of 0.5:1. The reaction temperature is 35°C. The reacted slurry is transferred to another gas-li...

Embodiment 3

[0053] A method for preparing pseudo-boehmite special for ceramic corundum abrasives, comprising the steps of:

[0054] (1) Preparation of sodium metaaluminate solution for the production of pseudo-boehmite specially used for ceramic corundum abrasives: 32% sodium hydroxide solution and Al 2 o 3 Aluminum hydroxide powder with a content of 62.7% was added to the reactor with stirring to control the Al 2 o 3 :Na 2 O molar ratio is 1:1.25; Reaction pressure is 0.2MPa; Reaction temperature is 120 ℃, and the reaction time is 6 hours, prepares the sodium metaaluminate solution that ceramic corundum abrasive special-purpose pseudo-boehmite is produced;

[0055] (2) Prepare Al 2 o 3 The sodium metaaluminate solution with a concentration of 100g / L and the prepared Al 2 o 3 The aluminum sulfate solution with a concentration of 90g / L is added to a stirred reactor at a volume ratio of 0.6:1, and the reaction temperature is 36°C. The reacted slurry is added to another gas-liquid rea...

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Abstract

The invention discloses a preparation method of pseudo-boehmite, which comprises the following steps: (1) preparation of sodium metaaluminate solution; (2) preparing Al 2 o 3 Concentrated sodium metaaluminate solution and aluminum sulfate solution are added to the reaction kettle at the same time in a certain proportion and reacted. After the reaction, the slurry is transferred to another gas-liquid reaction kettle, and carbon dioxide gas is introduced into the gas-liquid reaction kettle. And control the volume ratio of air and carbon dioxide to react; (3) aging, exchange washing, filtering and drying the obtained product to obtain the pseudo-boehmite dry powder specially used for ceramic corundum abrasives. The pseudo-boehmite prepared by the invention has very low impurity content, good peptization, good gel-forming performance, transparent glue, high glue viscosity and good bonding performance, and is a special pseudo-boehmite for ceramic corundum abrasives. Moreover, by adopting the method, the output of the single-pot pseudo-boehmite can be greatly increased, thereby greatly reducing the production cost.

Description

technical field [0001] The invention belongs to the technical field of ceramic corundum abrasive alumina, in particular to a method for preparing pseudo-boehmite special for ceramic corundum abrasive. Background technique [0002] The pseudo-boehmite specially used for ceramic corundum abrasives is a special pseudo-boehmite with high viscosity. Pseudo-boehmite is also called pseudo-boehmite or pseudo-boehmite, which contains 1.8 to 2.5 Alumina crystal of crystalline water molecules, which is the first crystal phase formed in the synthesis of aluminum hydroxide, is the transition state of aluminum hydroxide, and its crystallization is incomplete, and the typical crystal form is a very thin wrinkled platelet , the product of pseudo-boehmite calcined between 400 and 700 °C γ-Al 2 o 3 It is widely used as a catalyst carrier, catalyst and adsorbent, etc.; and can be calcined at 1100-1200°C to obtain nano-scale α-Al 2 o 3 , Widely used as coating additives, high-grade ceramics...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/142
CPCC01F7/142C01P2002/72C01P2006/12C01P2006/14C01P2006/16
Inventor 邹凌峰
Owner 湖南约瑟夫科技有限公司
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