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Preparation method of nature sodium base bentonite for precise casting

A sodium-based bentonite and precision casting technology, which is applied in casting molding equipment, clay products, applications, etc., can solve the problems of short weather resistance, poor effect, poor high temperature resistance and weather resistance, and achieve good air permeability , good reusability, high temperature resistance and weather resistance

Inactive Publication Date: 2013-03-20
董宪姝
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Most of the currently used calcium-based bentonite after artificial sodium is not very good in high temperature resistance and weather resistance, and when the bentonite after artificial sodium is in contact with a high temperature higher than 300 ° C, it will rebound, and the weather resistance short, bad effect

Method used

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  • Preparation method of nature sodium base bentonite for precise casting

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Embodiment 1

[0018] A preparation method of natural sodium bentonite for precision casting, comprising the following steps:

[0019] (1) collect bentonite ore;

[0020] (2) drying the bentonite ore obtained in the above step (1) to a water content of 15-25%, preferably 20%;

[0021] (3) use pulverizer to carry out coarse crushing to the bentonite ore that above-mentioned step (2) obtains, obtain the crushed ore of particle diameter at 0.5-1 centimetre;

[0022] (4) adjust sodium content, batching, add the soda ash of bentonite ore weight 2% and the caustic soda of 0.5% in the crushed ore that above-mentioned step (3) obtains;

[0023] (5) the coarse ore that the above-mentioned step (4) is regulated sodium content carries out sodiumization by extruding sodiumization machine;

[0024] (6) drying the coarse ore after the sodiumization of the above step (5) to a water content of 5-10%;

[0025] (7) Crushing the coarse ore after the sodiumization in the above step (6) to a diameter of 0.05 ...

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Abstract

The present invention discloses a preparation method of nature sodium base bentonite for precise casting. The method comprises mining, drying, coarse crushing, sodium content adjustment, sodium modification, drying, crushing and other steps. The preparation method has the following advantages that: no bounce is generated when the bentonite obtained through the method contacts a high temperature of more than 300 DEG C, and the obtained bentonite has characteristics of good high temperature resistance, good weathering resistance, molding sand bonding, good reusability, low addition, and good air permeability.

Description

technical field [0001] The invention relates to a preparation method of bentonite, in particular to a preparation method of natural sodium bentonite for precision casting, and belongs to the field of bentonite preparation. Background technique [0002] Bentonite is a hydrous aluminosilicate mineral with a 2:1 crystal structure. Its main component is montmorillonite. Bentonite is generally divided into calcium-based bentonite and sodium-based bentonite. Most of the bentonite on the market is artificial sodium-based calcium-based bentonite. Natural sodium-based bentonite is rare, so it is very rare. Artificial sodium bentonite is far inferior to natural sodium bentonite in some properties. The sodiumization of bentonite is to use the cation exchange characteristics of the montmorillonite flake structure to replace the high-priced calcium and magnesium ions. Its replacement process is: [0003] [0004] Most of the currently used calcium-based bentonite after artificial ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/18C04B33/04
Inventor 董宪姝
Owner 董宪姝
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