Process for preparing bentonite based sodium with high expension performance by drying method

Abstract

A process for preparing high-expansibility Na-based bentone by dry method includes such steps as proportionally mixing bentone powder, sodium salt powder and urea powder, and heating at 85-120 deg. C for 0.5-5 hr. Its expansibility can reach 40-95 ml / g.

Description

technical field [0001] The invention relates to a dry method for preparing sodium-based bentonite with high expansion performance, and belongs to the technical field of preparation of sodium-based bentonite with high expansion performance. Background technique [0002] Bentonite, also known as bentonite or bentonite, is a clay rock whose main component is montmorillonite—montmorillonite clay rock. Due to the properties of swelling, water absorption, dispersibility, adsorption, catalytic activity, thixotropy, cation exchange and lubrication, bentonite is widely used in metallurgical pellets, foundry sand binders, papermaking, rubber industry fillers, printing and dyeing Rinsing, petrochemicals, daily chemicals, coatings, environmental protection, textiles, medicine, adsorption of radioactive substances, soil improvement, ceramics, new building materials, electrical insulation materials, cosmetics, soap and food, carriers, feed additives, etc. 24 fields 1...

AI Technical Summary

Problems solved by technology

[0008] 1. Solution ion exchange method: Put raw material bentonite into hot water, add sodium compound (such as NaCl, etc.) high energy consumption

[0009] 2. Storage yard sodiumization method: after mixing wet raw ore with soda ash powder, they are stacked and aged to complete the ion exchange reaction. This method has a high degree of mechanization, but takes a long time

This method requires more equipment, longer process route, higher production cost, and is difficult to achieve large-scale production

[0011] 4. Raymond mill sodiumization method: Chinese Patent Publication No. CN1194940A proposes to combine calcium-based bentonite raw ore containing a certain amount of water with Na 2 CO 3 The method of adding sodium-based bentonite to grinding in a Raymond mill, but this method requires high moisture content of bentonite (moisture content needs to reach 13-18%), and when the moisture content is high, there will be problems with the adaptability of materials and equipment In addition, the reaction time between materials and equipment in this method is relatively short, and incomplete sodiumization is prone to occur, so that the expansion performance of the obtained bentonite product is limited.

[0012] 5. Microwave sodiumization method: Chinese Patent Publication No. CN1454941A proposes a dry-process sodiumization method that uses microwaves to promote the sodiumization reaction. This process requires high equipment, large investment, and a large amount of sodiumizing agent

[0013] In addition, the patent related to the present invention also includes Chinese Patent Publication No. CN1563207A, which discloses a method of heating and mixing urea and montmorillonite so that urea enters the interlayer of montmorillonite to increase the interlayer distance of montmorillonite (001) method, but this method can not play a role in sodiumization and improve the swelling performance and dispersion performance of bentonite

[0014] To sum up, the existing methods for sodiumizing bentonite generally have defects such as long sodiumizing time, high requirements for equipment, and limited expansion properties of sodiumized products.

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