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Circular sodium chloride method for sodium treatment of calcium bentonite

A sodium-calcium-based, sodium chloride technology, applied in chemical instruments and methods, inorganic chemistry, silicon compounds, etc., can solve the problems of reagent loss, high energy consumption, unfavorable for industrialized implementation, etc., to reduce production costs, avoid The effect of loss

Inactive Publication Date: 2012-01-04
XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sodium chloride, as a cheaper sodiumizing agent than sodium carbonate, sodium fluoride, sodium pyrophosphate, sodium tripolyphosphate, etc., is a comparative reagent often mentioned in many sodiumizing related documents. The sodiumization mechanism is different. If the sodiumization effect is not achieved by conventional methods and commonly used amounts, this is also the reason why many literatures have concluded that the sodium chloride sodiumization effect is relatively poor and not used.
Wang Lin et al. used sodium chloride and 50% ethanol to sodium bentonite under microwave high temperature conditions to obtain sodium bentonite. Wang Jianxu et al. obtained better sodium bentonite in the presence of a higher concentration of sodium chloride in a water bath at 80°C. , both of the above two methods are operated under non-room temperature conditions, compared with high energy consumption, which is not conducive to industrial implementation
More importantly, the use efficiency of sodiumizing agent is very low, resulting in a large loss of reagents

Method used

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  • Circular sodium chloride method for sodium treatment of calcium bentonite
  • Circular sodium chloride method for sodium treatment of calcium bentonite
  • Circular sodium chloride method for sodium treatment of calcium bentonite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Weigh calcium-based bentonite (expansion capacity 11.0ml / g, exchangeable calcium 98.4mmol / 100g, exchangeable sodium 0.34mmol / 100g,) 5g pulverized, after sieving 100 mesh, add 25ml and prepare with tap water to have an initial mass concentration of 5 % sodium chloride solution, stir for 60 minutes to disperse the solid evenly in the solution, let stand for sodium for 30 minutes, and perform solid-liquid centrifugation to obtain circulating liquid and solid according to conventional methods;

[0025] Add the solid to 40ml of tap water to make a slurry with a mass percentage concentration of 10%. After stirring evenly, separate the solid and liquid according to the conventional method to obtain the clear liquid and sodium soil, and then dry and pulverize the sodium soil according to the conventional method to obtain sodium base bentonite.

[0026] Using the building materials industry standard JC / T 593-1995 "Bentonite Test Method" of the People's Republic of China, the exp...

Embodiment 2

[0028] Weigh 5g of calcium-based bentonite and pulverize it, sieve it through 150 meshes, add 20ml of sodium chloride solution with a mass concentration of 15%, stir for 30min to disperse the solid evenly in the solution, let stand for sodium for 45min, and carry out solid-liquid centrifugation according to conventional methods Separation of circulating fluid and solids;

[0029] Add the solid to 15ml of tap water to make an ore slurry with a mass percentage concentration of 20%. After stirring evenly, separate the solid and liquid according to the conventional method to obtain the clear liquid and sodium soil, and then dry and pulverize the sodium soil according to the conventional method to obtain sodium Based on bentonite, the measured expansion capacity is 84ml / g, and the alkalinity coefficient is greater than 1.

Embodiment 3

[0031] Weigh 5g of calcium-based bentonite and pulverize it, sieve it through 200 meshes, add 15ml of sodium chloride solution with a mass concentration of 25%, stir for 15 minutes to disperse the solid evenly in the solution, let stand for sodium for 120 minutes, and carry out solid-liquid centrifugal separation according to conventional methods Obtain circulating fluid and solids;

[0032] Add the solid to 90ml of tap water to make an ore slurry with a concentration of 5% by mass. After stirring evenly, separate the solid and liquid according to the conventional method to obtain the clear liquid and sodium soil, and then dry and pulverize the sodium soil according to the conventional method to obtain sodium Based on bentonite, the measured expansion capacity is 84ml / g, and the alkalinity coefficient is greater than 1.

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Abstract

The invention relates to a circular sodium chloride method for sodium treatment of calcium bentonite. Sodium chloride is used as a sodium treatment agent, and when the concentration of the sodium chloride is relatively high, calcium ions of bentonite layers are exchanged through mass transfer to realize the sodium treatment. As only a small part of the sodium chloride is involved in the sodium treatment and the majority of the sodium chloride stays in the solution after solid and liquid are separated, the separated liquid can be reused for the sodium treatment of the next batch of calcium bentonite, the sodium chloride can be circularly used for multiple times according to the initial concentration of the sodium chloride, and the sodium chloride is compensated through calcium removal for continuous use. The sodium chloride is a strong dielectric medium; when the concentration of the sodium chloride is very high, the structure charges of the bentonite can be ordered and the bentonite viscosity can be temporarily reduced so as to facilitate operation of stirring, dehydration and the like under a relatively high pulp density. The circular sodium chloride method has the advantages of low cost, water conservation, simple operation, easy industrial production, and the like.

Description

technical field [0001] The invention relates to a method for sodiumizing bentonite, in particular to a method for sodiumizing calcium-based bentonite by using a circulating sodium chloride method. Background technique [0002] Bentonite is a clay mineral widely used in building materials, metallurgy, petroleum, agriculture, medicine, light industry and other industries. It is a 2:1 layered silicate mineral composed of two layers of silicon-oxygen tetrahedron sandwiching a layer of aluminum-oxygen octahedron. Because the high-valence elements in the structure are replaced by low-valence elements, the charge of the structure is unbalanced, so the interlayer Adsorption of cations is required to balance the charge. According to the type and content of interlayer cations, it can be divided into calcium-based bentonite and sodium-based bentonite. The vast majority of bentonite in my country and the world belongs to calcium-based bentonite. Because the performance of sodium-based...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/40
Inventor 黎艳王晓军郭新锋王娟芳
Owner XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI