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A production process for refining montmorillonite by using bentonite

A production process and technology of bentonite, applied in the production process field of refining montmorillonite by using bentonite, can solve the problems such as failure to pass, product purity not meeting the requirements of fine chemical industry, inability to separate new impurities, etc.

Active Publication Date: 2020-06-23
杭州柏科立新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing bentonite purification process is divided into two types: ① dry purification: use Raymond machine to pulverize and separate and purify by adjusting the negative pressure and using the specific gravity method. During the Raymond machine grinding process, impurities (quartz, calcium carbonate, calcite) are easily broken into The fine powder is mixed into the finished product, and these fine powder impurities are difficult to separate from the finished product, the purity is poor, the added value is low, and its application range is limited; ② wet purification: traditional wet purification can partially remove coarse impurities, but cristobalite (and montmorillonite Density similar to stone), etc. cannot be removed, and new impurities produced after modification cannot be separated; montmorillonite easily absorbs water 30 times its own specific gravity to form a gel, and fine powder impurities (soil, organic matter and other impurities in the raw ore are suspended in the colloid and cannot pass through sedimentation , centrifugation and other methods to separate and remove, the product purity is far below the requirements of fine chemicals, which limits its application range

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A production process utilizing bentonite to refine montmorillonite, comprising the steps of:

[0033] Step 1) bentonite ore slurry making: add water to the mined bentonite and stir to make mud, and the mud concentration is controlled at 10%;

[0034] Step 2) Screening the slurry: pass the bentonite slurry through a 200-mesh sieve to remove coarse impurities in the raw ore; the coarse impurities in this step entrain part of the montmorillonite, and sieve the slurry in a second cycle with a 200-mesh sieve.

[0035] Step 3) slurry modification: add a modifier of 2% bentonite equivalent to the slurry, control the pH value of the slurry at 8, and react for 2 hours at a temperature of 50°C, add water to adjust the slurry to 2% concentration, and then After adding the viscosity reducer, the slurry is separated by a conical slag remover, and then the slurry is separated by a 325-mesh filter to obtain a high-purity bentonite slurry. Wherein, the modifier is one or more of sodiu...

Embodiment 2

[0043] A production process utilizing bentonite to refine montmorillonite, comprising the steps of:

[0044] Step 1) bentonite ore slurry making: add water to the mined bentonite and stir to make mud, and the mud concentration is controlled at 12%;

[0045] Step 2) Screening the slurry: pass the bentonite slurry through a 200-mesh sieve to remove coarse impurities in the raw ore; the coarse impurities in this step entrain part of the montmorillonite, and sieve the slurry in a second cycle with a 200-mesh sieve.

[0046] Step 3) Slurry modification: add a modifier of 3% bentonite equivalent to the slurry, control the pH value of the slurry at 9, and react for 2 hours at a temperature of 70° C., add water to adjust the slurry to 5% concentration, and then After adding the viscosity reducer, the slurry is separated by a conical slag remover, and then the slurry is separated by a 325-mesh filter to obtain a high-purity bentonite slurry. Wherein, the modifier is one or more of sod...

Embodiment 3

[0054]A production process utilizing bentonite to refine montmorillonite, comprising the steps of:

[0055] Step 1) bentonite ore slurry making: add water to the mined bentonite and stir to make mud, and the mud concentration is controlled at 15%;

[0056] Step 2) Screening the slurry: pass the bentonite slurry through a 200-mesh sieve to remove coarse impurities in the raw ore; the coarse impurities in this step entrain part of the montmorillonite, and sieve the slurry in a second cycle with a 200-mesh sieve.

[0057] Step 3) slurry modification: add a modifier of 4% bentonite equivalent to the slurry, control the pH value of the slurry at 10, and react for 3 hours at a temperature of 90° C., add water to adjust the slurry to 8% concentration, and then After adding the viscosity reducer, the slurry is separated by a conical slag remover, and then the slurry is separated by a 325-mesh filter to obtain a high-purity bentonite slurry. Wherein, the modifier is one or more of sod...

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PUM

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Abstract

The invention relates to the field of bentonite purification processes, particularly to a process for producing refined montmorillonite by using bentonite. The process comprises: raw ore pulping, sieving, modifying, flocculation dehydration, acid neutralization, flocculation dehydration, washing, pulp adjusting and peeling, concentrating, spray drying, dispersing, and packaging. With the production process of the present invention, impurities, alkali insoluble impurities and acid insoluble impurities can be removed from raw ore, and the new generated impurities after the modification can be removed so as to further improve the product purity.

Description

technical field [0001] The invention relates to the field of bentonite purification technology, in particular to a production technology for refining montmorillonite by using bentonite. Background technique [0002] Bentonite is a non-metallic mineral with montmorillonite as the main mineral component. The montmorillonite structure is a 2:1 crystal structure composed of two silicon-oxygen tetrahedra sandwiching a layer of aluminum-oxygen octahedron. Due to the formation of montmorillonite unit cells There are some cations in the layered structure, such as Cu, Mg, Na, K, etc., and the interaction between these cations and the montmorillonite unit cell is very unstable, and they are easily exchanged by other cations, so they have good ion exchange properties. Bentonite is also called bentonite, bentonite or bentonite. my country has a long history of developing and using bentonite, which was originally used as a detergent. (There was an open-pit mine in the Renshou area of ​...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/40
CPCC01B33/40
Inventor 王静黄帮委
Owner 杭州柏科立新材料有限公司