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A method for separating and purifying montmorillonite from calcium bentonite

A technology of calcium-based bentonite and montmorillonite, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve problems such as poor crystallization, difficulty in separation and purification, and difficulty in purifying montmorillonite

Active Publication Date: 2016-04-06
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main problems in the purification of bentonite are: first, due to the fine grains of montmorillonite minerals, poor crystallization, variable composition, and other impurities such as cristobalite and quartz with very fine particle sizes, its separation and purification are very difficult, especially It is especially difficult to purify calcium-based montmorillonite
[0004] In particular, for calcium-based bentonite associated with ultrafine ashlarite, it is very difficult to purify montmorillonite. At present, there is no literature report on the method of separating and removing ultrafine ashlarite from calcium-based bentonite to purify montmorillonite.

Method used

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  • A method for separating and purifying montmorillonite from calcium bentonite
  • A method for separating and purifying montmorillonite from calcium bentonite
  • A method for separating and purifying montmorillonite from calcium bentonite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Make a slurry of bentonite raw ore and water at a solid-to-liquid weight ratio of 1:3, soak it in a container, stir it with a stirrer for 0.5 hours, let it stand for 8 hours, extract the slurry in the upper 10cm of the container, centrifuge it with a centrifuge, and dry it to remove large particles. Particle impurities to obtain montmorillonite to be purified.

[0069] The montmorillonite and water to be purified are made into a suspension liquid with a solid-to-liquid weight ratio of 3:100, 1.0% mass fraction of sodium carbonate is added, and diluted sodium hydroxide solution is added to adjust the pH value of the slurry to 10.0. / min speed centrifugal dehydration to obtain powder I (preliminary purified montmorillonite);

[0070] Make powder I and water into a suspension with a solid-to-liquid weight ratio of 3:100, add diluted sodium hydroxide solution to adjust the pH value of the slurry to 10.0, stir at a stirring speed of 5000r / min for 20min, and then use 80W ultr...

Embodiment 2

[0077] Make a slurry of bentonite raw ore and water at a solid-to-liquid weight ratio of 1:9, soak it in a container, stir it with a stirrer for 0.5 hours, let it stand for 8 hours, extract the slurry in the upper 10cm of the container, centrifuge it with a centrifuge, and dry it to remove large particles. Particle impurities to obtain montmorillonite to be purified.

[0078]The montmorillonite and water to be purified are made into a suspension liquid with a solid-to-liquid weight ratio of 3:100, 1.0% mass fraction of sodium carbonate is added, and diluted sodium hydroxide solution is added to adjust the pH value of the slurry to 10.3, and after 0.5 hours, the pH value of the slurry is adjusted to 1000 r / min speed centrifugal dehydration to obtain powder I (preliminary purified montmorillonite);

[0079] Make powder I and water into a suspension with a solid-to-liquid weight ratio of 3:100, add diluted sodium hydroxide solution to adjust the pH value of the slurry to 10.3, s...

Embodiment 3

[0082] Make a slurry of bentonite raw ore and water at a solid-to-liquid weight ratio of 1:6, soak it in a container, stir it with a stirrer for 0.5 hours, let it stand for 8 hours, and extract the slurry within the upper 10cm of the container by centrifuging and drying to remove large Particle impurities to obtain montmorillonite to be purified.

[0083] The montmorillonite to be purified and water are made into a suspension liquid with a solid-to-liquid weight ratio of 1:100, 0.8% mass fraction of sodium carbonate is added, and diluted sodium hydroxide solution is added to adjust the pH value of the slurry to 10.5. / min speed centrifugal dehydration to obtain powder I (preliminary purified montmorillonite);

[0084] Make powder I and water into a suspension with a solid-to-liquid weight ratio of 1:100, add diluted sodium hydroxide solution to adjust the pH value of the slurry to 10.5, stir at a stirring speed of 5000r / min for 20min, and then use 80W ultrasonic vibration powe...

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Abstract

The invention discloses a method of separating and purifying montmorillonite from calcium bentonite. The method includes: adding dispersants such as sodium carbonate into a bentonite suspension, adjusting the pH value of the suspension, separating to obtain primarily-purified montmorillonite, adjusting the pH value of a suspension of the primarily-purified montmorillonite to a certain value, performing ultrasonic wave processing, and separating to obtain the high-purity montmorillonite. The chemical structure of the montmorillonite is unchanged. A superfine cristobalite impurity concomitant with the montmorillonite in the calcium bentonite is effectively removed. By ultrafine particle dispersion, the superfine cristobalite particles and the montmorillonite are depolymerized, thus enhancing dispersion and suspension capability of the superfine cristobalite particles and the montmorillonite. The cristobalite is removed by utilization of fractional centrifugation so as to obtain the high-purity montmorillonite, thus solving the technical problem that the cristobalite is hard to remove in the montmorillonite purification. The method has characteristics of simple process, mild conditions, cheap and easily available raw materials, low equipment requirements, high added value of products, and the like.

Description

technical field [0001] The invention relates to a method for separating and purifying montmorillonite, in particular to a method for separating and purifying montmorillonite from calcium-based bentonite. The purified montmorillonite has high purity and unchanged structure. Background technique [0002] Bentonite is a rock with montmorillonite minerals as the main component. It is clay and clay rock with montmorillonite minerals reaching the available content. It is known as "universal clay". Bentonite has a wide range of applications. With the development of modern technology, bentonite has been introduced from traditional casting, pellets, drilling mud, adsorbents and other fields to nanomaterials, medicine, carrier materials, and fine chemicals as high value-added products. , including bentonite interlayer compounds, heat storage materials, gas filtration adsorption purification materials, conductive materials, inorganic antibacterial agents, nano thickening rheological ag...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/40
Inventor 张洁廖立兵
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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