Sodium bentonite preparation method

Abstract

The invention discloses a sodium bentonite preparation method, and the method comprises the following steps: S1, crushing and purifying: putting calcium bentonite ore into a Raymond mill of which the bottom of a scraper knife is provided with a slag discharge hole for crushing, so that impurities with high stacking density are discharged through the slag discharge hole while the calcium bentonite ore is crushed, and further obtaining purified powdery calcium bentonite ore; s2, shearing and sodium modification: adding the purified calcium bentonite ore, a sodium modification modifier and an auxiliary agent into a kneading machine, starting the heating function of the kneading machine, starting the kneading machine at the same time to shear and knead the mixture, slowly adding water in the shearing and kneading process, keeping high-temperature shearing for 20-60 minutes, and performing discharging; S3, drying and crushing: drying the kneaded raw materials in the sun or drying to obtain a material with the water content of 12% or below. The preparation method has the advantages of few procedures, high yield, simplicity in operation and no pollution, and the quality of the prepared sodium bentonite finished product is high.

Description

technical field [0001] The invention relates to the fields of coatings and pesticide preparations, in particular to a preparation method of bentonite with high expansion capacity. Background technique [0002] Clay products are widely used in agriculture, light industry, metallurgy, chemical industry, building materials, machinery, national defense, environmental protection and other industrial sectors because of their unique and excellent properties, such as slipperiness, adsorption, and expansibility. In the paint coating industry, as the country pays more and more attention to environmental protection, solvent-based paints are more and more replaced by water-based paints, such as water-based industrial paints and water-based building materials, because they use a large amount of volatile solvents and cause environmental pollution. Paint, water-based home improvement paint, etc. In the industry of water-based coatings and pesticide formulations, clay minerals have attract...

AI Technical Summary

Problems solved by technology

In the process of wet purification of calcium-based montmorillonite, a large amount of water needs to be used, the cost is high, the output is low, and there are many processes, which is not conducive to environmental protection

The purified calcium-based montmorillonite has the characteristics of easy dispersion and fast hydration in water, and can be rapidly swelled and dispersed in water, but it is difficult to form a stable gel; the purified sodium-based montmorillonite can be dispersed in water after being fully dispersed. Form a stable gel state, but because sodium-based montmorillonite easily swells with water to form a barrier layer, which hinders the further infiltration of water, and forms hydrated gel particles on the surface, which affects its dispersed particle size, making it difficult to form a uniform gel. colloid