Method for purifying montmorillonite, purified montmorillonite and combination thereof

A technology of montmorillonite and montmorillonite powder, which is applied to chemical instruments and methods, wet separation, and other household appliances, and can solve problems such as high cost, difficult separation of fine-grained impurities, and long purification cycle

Active Publication Date: 2010-06-16
ZHEJIANG HAILISHENG PHARM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the process is simple, the product quality is difficult to control. Because the proportion of impurities is similar to that of montmorillonite, it is difficult to separate fine impurities and obtain high-purity montmorillonite. This method is generally suitable for high-purity montmorillonite with a purity of more than 80%. Quality ore separation, and purification of montmorillonite ore that does not require high purity of montmorillonite products
The wet method is suitable for the purification of medium and low-quality bentonite with a montmorillonite purity of 30-80%. The product quality is stable, but the purification cycle is long and the cost is high. The purity of the obtained montmorillonite is about 90%.

Method used

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  • Method for purifying montmorillonite, purified montmorillonite and combination thereof
  • Method for purifying montmorillonite, purified montmorillonite and combination thereof
  • Method for purifying montmorillonite, purified montmorillonite and combination thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0259] The purification of embodiment 1 montmorillonite

[0260] Mineral composition of raw bentonite: montmorillonite 42.5%, α-quartz 33.9%, kaolin 12.0%, feldspar 7.4%, calcite 4.3%, see Figure 2.

[0261] The raw ore is dried, crushed, passed through a 50-mesh sieve, added water and 0.3% sodium hexametaphosphate of raw ore powder to form a slurry with a solid content of 20%, stirred for two hours, passed through a three-stage hydrocyclone, and separated The slurry is mixed with water to make a thin slurry with a solid content of 3%, which is separated in a disc centrifuge, and the separated thin slurry is concentrated in another disc centrifuge, and the concentrated slurry is passed through a plate and frame filter press After pressure filtration, a filter cake with a solid content of 40-50% is obtained. The filter cake is dried at 120° C. and crushed to a size above 500 mesh.

[0262] The mineral composition of the purified montmorillonite is 95.1% montmorillonite and 5.1...

Embodiment 2

[0263] The purification of embodiment 2 montmorillonite

[0264] Mineral composition of raw bentonite: montmorillonite 46.8%, α-quartz 53.2%, see Figure 4.

[0265] The raw ore is dried, crushed, passed through a 50-mesh sieve, added water and 0.5% sodium polyacrylate powder of the raw ore, and made into a slurry with a solid content of 15%, stirred for 2.5 hours, passed through a four-stage hydrocyclone, and separated Add water to the slurry to make a thin slurry with a solid content of 3%, enter the disc centrifuge for separation twice, and the separated thin slurry enters another disc centrifuge to concentrate, and the concentrated slurry is filtered by plate and frame After press filtration, a filter cake with a solid content of 40-50% is obtained. The filter cake is dried at 120°C and crushed to a size above 500 mesh.

[0266] The mineral composition of the purified montmorillonite: 96.7% montmorillonite, 3.3% α-quartz, see Figure 5. The recovery rate is 65%, heavy meta...

Embodiment 3

[0267] The purification of embodiment 3 montmorillonite

[0268] Mineral composition of raw bentonite: 86.5% montmorillonite, 13.5% α-quartz, see Figure 6.

[0269] The raw ore is dried, crushed, passed through a 50-mesh sieve, added water and 0.8% sodium hexametaphosphate of raw ore powder, and made into a slurry with a solid content of 25%. After stirring for two hours, pass through a three-stage hydrocyclone, The separated slurry is mixed with water to make a thin slurry with a solid content of 3%, and it is separated once in a disc centrifuge, and the separated thin slurry is concentrated in another disc centrifuge, and the concentrated slurry is pressed through a plate and frame. After pressing by the filter, a filter cake with a solid content of 40-50% is obtained, which is dried at 120°C and crushed to a size above 500 mesh.

[0270] Mineral composition of purified montmorillonite: 97.0% montmorillonite, 3.0% α-quartz, see Figure 7. The recovery rate is 75%, heavy met...

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Abstract

A method for purification and separation of inorganic mineral, especially for purification and separation of montmorillonite from natural bentonite is provided. The said method is simple, and uses high-speed centrifugal device to well solve the problems present in purification of montmorillonite that a-quartz and cristobalite are difficult to be separated and removed and purified slurry is difficult to be concentrated and dehydrated. The purity of montmorillonite thus obtained is not less than 95%.

Description

technical field [0001] The invention relates to a method for separating and purifying inorganic minerals, in particular to a method for separating and purifying montmorillonite from natural bentonite. Background technique [0002] Natural bentonite is a mixture of clay and skeletal silicate minerals, the main mineral component is montmorillonite which expands with water. In order to obtain montmorillonite with higher purity or higher quality, it is necessary to separate and remove other minerals in natural montmorillonite. [0003] Natural montmorillonite is associated with non-clay silicate minerals such as silica, opal, feldspar, gypsum, calcite, perlite, zeolite, etc., and also contains clay minerals such as kaolinite, illite, chlorite, and a small amount of The content of montmorillonite is usually 50%-70%, and the content of some rich ore can reach 80%-90%. Utilizing the expansion characteristics of montmorillonite in water, it can be separated from the symbiotic non-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B03B5/32C04B41/00C04B33/04
CPCB03B5/32
Inventor 郑海辉吕光烈
Owner ZHEJIANG HAILISHENG PHARM CO LTD
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