Pseudo-boehmite preparation method

A pseudo-boehmite, aluminum sulfate technology, applied in chemical instruments and methods, alkali metal aluminate/alumina/aluminum hydroxide preparation, aluminum compounds, etc., to improve yield, good peptization, and gel-forming properties Good results

Active Publication Date: 2020-01-07
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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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

[0041] A method for preparing pseudo-boehmite special for ceramic corundum abrasives, comprising the steps of:

[0042] (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 3Aluminum 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;

[0043] (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-l...

Embodiment 3

[0051] A method for preparing pseudo-boehmite special for ceramic corundum abrasives, comprising the steps of:

[0052] (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;

[0053] (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 apseudo-boehmite preparation method, which comprises: (1) preparing a sodium metaaluminate solution; (2) simultaneously adding the sodium metaaluminate solution with the prepared Al2O3 concentration and an aluminum sulfate solution into a reaction kettle in a parallel flow manner according to a certain ratio, carrying out a reaction, transferring the slurry into another gas-liquid reaction kettle after the reaction, introducing carbon dioxide gas into the gas-liquid reaction kettle, controlling the volume ratio of air to carbon dioxide, and carrying out a reaction; and(3) carrying out aging, exchange washing, filtering and drying on the obtained product to obtain the special pseudo-boehmite dry powder special for ceramic corundum abrasive materials. According to the invention, the prepared pseudo-boehmite is low in impurity content, good in peptization, good in gelling property, good transparency in gel, high in gel viscosity and good in adhesive property, andis special pseudo-boehmite for ceramic corundum abrasive materials; and by adopting the method, the yield of the single-kettle pseudo-boehmite can be greatly improved, so that the production cost is greatly reduced.

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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IPC IPC(8): C01F7/14
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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