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Alkaline calcium bentonite and its preparation method

A technology of bentonite and alkaline calcium, applied in chemical instruments and methods, cation exchange, non-metallic elements, etc., can solve problems such as complex production process, pollution, large equipment investment, etc., and achieve the effect of broadening the application field

Inactive Publication Date: 2006-07-19
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] From the above search results, it is known that the public literature mainly introduces changing calcium-based bentonite to sodium-based bentonite, or modifying it into organic bentonite, but does not mention modifying bentonite to have anion exchange capacity. The production process of the modified bentonite method is relatively complicated, as document 2 proposes the need for acid activation, heat activation, TiCl 4 Activation, Aluminum Hydroxide and AlCl 3 Activation and other steps, although some methods are not difficult, but the investment in equipment is relatively large. For example, documents 6 and 7 propose that Raymond mill or mixing equipment is required, and the total cost is also relatively high.
Some production processes may also produce pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Mix activated clay with an activity of 240, a particle size of 60 mesh, and sulfuric acid method with water in an amount 3 times the mass of activated clay to make a slurry; add 30% of the mass of activated clay to the above slurry Calcium (CaO purity greater than 95%), mixed evenly to obtain the reaction raw meal; pave the reaction raw meal with a thickness of 10mm, and react at 50°C for 15 hours to obtain the reaction clinker; the reaction clinker was washed with water to remove unreacted hydrogen Calcium oxide was dried to obtain an alkaline calcium-based bentonite with an anion exchange capacity of 1.5 mmol / g.

Embodiment 2

[0024] Mix activated clay with activity degree 245, particle size 100 mesh, prepared by sulfuric acid method, and water with an amount 4 times the mass of activated clay to make a slurry; add 42% hydrogen in the amount of activated clay to the above slurry Calcium Oxide (Ca(OH) 2 Purity greater than 90%), mixed evenly to obtain reaction raw meal; paved reaction raw meal, thickness 5mm, reacted at 60 ° C for 18 hours to obtain reaction clinker; reaction clinker was washed with water to remove unreacted calcium hydroxide, Dry to obtain an alkaline calcium-based bentonite with an anion exchange capacity of 1.8 mmol / g.

Embodiment 3

[0026] Mix activated clay with an activity of 270, a particle size of 150 mesh, and the hydrochloric acid method with water twice the mass of activated clay to make a slurry; add 40% of the mass of activated clay to the above slurry Calcium (CaO purity greater than 95%), mixed evenly to obtain the reaction raw meal; pave the reaction raw meal with a thickness of 5mm, and react at 50°C for 18 hours to obtain the reaction clinker; the reaction clinker was washed with water to remove unreacted hydrogen Calcium oxide was dried to obtain an alkaline calcium-based bentonite with an anion exchange capacity of 2.5 mmol / g.

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Abstract

The invention discloses an alkaline calcium bentonite and making method, which comprises the following steps: adapting active carclazyte and calcium oxide as raw material; mixing the raw material evenly; reacting the calcium oxide and water to produce calcium hydroxide; diffusing the calcium hydroxide in the active carclazyte layers; reacting one of two oxyhydrogen base with hydrogen of active carclazyte to produce the alkaline calcium bentonite with anion exchanging function. The invention can react with organic acid to prepare composite layered nanometer material, which can be applied in the coating, plastic and new adsorptive material domain.

Description

technical field [0001] The invention relates to an activated bentonite, in particular to an alkaline calcium-based bentonite with anion exchange capacity and a preparation method thereof. Background technique [0002] Bentonite is a layered material with cation exchange capacity, and its main component is aluminosilicate. Natural bentonite is mostly calcium-based bentonite. Calcium-based bentonite and its modified products have functions such as swelling, hydrophilicity, adsorption, cation exchange, catalytic activity, dispersibility and suspension. It is widely used in the thickening and anti-sedimentation of coatings, the preparation of oilfield drilling mud, wastewater treatment, and catalyst preparation. However, its use is limited due to its lack of anion exchange function. Hydrotalcite is another layered material with anion exchange capacity, which can be used to treat wastewater, prepare catalysts, and composite layered nanomaterials. Due to the small reserves and h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J39/14C01B33/44
Inventor 韦藤幼童张法吴璇
Owner GUANGXI UNIV
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