Purification technology for low-grade bentonite

A technology of bentonite and low-grade bentonite, which is applied in the field of purification process of low-grade bentonite, can solve the problems of high cost, complicated process, and long purification cycle, and achieve the effects of low production cost, simple process, and short purification cycle

Inactive Publication Date: 2014-03-26
广西弘耀祥科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the disadvantages of long purification period, high cost and complex process in the existing low-grade bentonite purification process, ultrasonic-assisted purification is used to provide a low-grade bentonite purification process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The first step is to pulverize and grind the low-grade raw bentonite raw material (the content of montmorillonite is about 62%, measured by blue absorption method) to obtain bentonite fine powder with a particle size of -0.074mm. In the second step, take 100g of bentonite fine powder and mix with 500g of water, then add 0.5g of dispersant hexametaphosphoric acid, put them together in a stirrer and stir evenly to make a slurry. The third step is to place the homogeneously mixed pulp under ultrasonic conditions at 50°C for 30 minutes to accelerate the action of the dispersant and the pulp to separate impurities. The fourth step is to let the slurry stand for 30 minutes to separate the supernatant slurry. The fifth step is to use a centrifuge to centrifuge the supernatant slurry, the centrifugal speed is 1800r / min, and the time is 8min to remove impurities. In the sixth step, the supernatant is filtered through a filter, the filtered cake is further spray-dried, and then ...

Embodiment 2

[0025] The first step is to pulverize and grind the low-grade raw bentonite raw material (the content of montmorillonite is about 67%, which is measured by blue absorption method) to obtain bentonite fine powder with a particle size of -0.074mm. In the second step, take 100g of bentonite fine powder and mix with 600g of water, then add 0.5g of dispersant sodium pyrophosphate, put them together in a stirrer and stir evenly to make a slurry. The third step is to place the homogeneously mixed pulp under ultrasonic conditions at 80°C for 20 minutes to accelerate the action of the dispersant and the pulp to separate impurities. The fourth step is to let the pulp stand still for 20 minutes to separate the supernatant slurry. The fifth step is to use a centrifuge to centrifuge the supernatant slurry at a speed of 2000 r / min for 7 minutes to remove impurities. In the sixth step, the supernatant is filtered through a filter, the filtered cake is further spray-dried, and then pulverize...

Embodiment 3

[0027] The first step is to pulverize and grind the low-grade raw bentonite raw material (the content of montmorillonite is about 55%, measured by blue absorption method) to obtain bentonite fine powder with a particle size of -0.074mm. In the second step, take 100g of bentonite fine powder and mix with 500g of water, then add 0.6g of dispersant sodium silicate, put them together in a stirrer and stir evenly to make a slurry. The third step is to place the homogeneously mixed pulp under ultrasonic conditions at 60°C for 25 minutes to accelerate the action of the dispersant and the pulp to separate impurities. The fourth step is to let the pulp stand still for 35 minutes to separate the supernatant slurry. The fifth step is to use a centrifuge to centrifuge the supernatant slurry at a speed of 2500 r / min for 6 minutes to remove impurities. In the sixth step, the supernatant is filtered through a filter, the filtered cake is further spray-dried, and then pulverized by a pulveri...

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Abstract

The invention provides a purification technology for low-grade bentonite, belonging to the field of processing and utilization of non-metal ores. The purification technology comprises the following steps of preprocessing the raw materials; stirring to prepare pulp; ultrasonically purifying; standing for precipitating; separating out upper-layer slurry; removing impurities through centrifuging; filtering and drying. The purification technology is supported by ultrasonic waves; in the presence of a dispersing agent, the impurities can be well separated from montmorillonite, so that the purification effect is improved; furthermore, the purification technology is simple, is small in equipment investment, can be used for purifying the product with high content of montmorillonite from the low-grade bentonite rapidly, efficiently, simply and conveniently, has the advantages of low production cost and short purification period, and is easy to popularize.

Description

technical field [0001] The invention belongs to the field of non-metallic mineral processing and utilization, and in particular relates to a purification process of low-grade bentonite. Background technique [0002] Bentonite is a hydrous clay mineral mainly composed of montmorillonite. The chemical composition of montmorillonite is: (Al2, Mg3) Si4O10 OH2 nH2O, because it has special properties, such as swelling, cohesiveness, adsorption, catalytic, thixotropy, suspension and cation exchange, etc. , Widely used in various industrial fields. [0003] According to statistics, the proven reserves of bentonite resources in my country are nearly 8 billion tons. The resources are very rich, but they are mainly low-grade bentonite resources, and the degree of development and utilization is low. In low-grade bentonite, the content of clay mineral montmorillonite is basically between 40% and 70%, and the rest are non-clay minerals such as quartz and feldspar, so it is difficult...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/40
Inventor 林国友倪海明蓝丽农韦健陶靖
Owner 广西弘耀祥科技有限公司
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