Montmorillonite dry purification process

Abstract

The invention discloses a montmorillonite dry purification process. The dry purification process comprises the following steps: putting montmorillonite into a high-temperature airflow condition for disintegration; then heating mixed particles, measuring the particle size distribution of montmorillonite particles and impurity particles, designing a screening device, and screening the mixed particles; then grinding to obtain montmorillonite fine powder; grinding the montmorillonite fine powder by using a grinding roller to separate out impurities in the montmorillonite fine powder, adjusting theairflow pressure by using a Raymond mill to enable the impurities to settle downwards, removing the impurities through impurity removal holes of the Raymond mill, and collecting unsettled fine powderto obtain purified montmorillonite. According to the method, the montmorillonite is purified by adopting the dry purification process, so that the application of water resources and chemical substances is reduced, the method is low in purification cost, high in efficiency, good in continuous performance and easy to operate and produce, the purity of the montmorillonite purified by the method canbe improved by about 20%, and the method has an excellent industrialization prospect.

Description

technical field [0001] The invention relates to the technical field of ore purification, in particular to a dry purification process of montmorillonite. Background technique [0002] Montmorillonite is the main component of bentonite. Due to its special water absorption, water plasticity, cohesiveness and strong ion exchange, it has a wide range of applications today, and is widely used in various fields such as machinery, chemical industry, and health care. However, non-clay silicate minerals such as silica, opal, feldspar, gypsum, and calcite are associated with natural montmorillonite, and the purity is poor. The content of montmorillonite is usually 50%-70%, and the content of some rich minerals can reach 80%-90%. Utilizing the expansion characteristics of montmorillonite in water, it can be separated from the symbiotic non-metallic minerals, and then using the difference in particle size and density between the two, with the help of mechanical equipment such as cyclone...

AI Technical Summary

Problems solved by technology

However, non-clay silicate minerals such as silica, opal, feldspar, gypsum, and calcite are associated with natural montmorillonite, and the purity is poor. The content of montmorillonite is usually 50%-70%, and the content of some rich minerals can reach 80%-90%

Utilizing the expansion characteristics of montmorillonite in water, it can be separated from the symbiotic non-metallic minerals, and then using the difference in particle size and density between the two, with the help of mechanical equipment such as cyclone and centrifugal, to separate and remove the non-clay minerals with coarse particles. However, the α-quartz with fine particle size and close symbiosis with montmorillonite and the α-cristobalite with extremely fine particle size (0.1-0.5 μm) embedded with montmorillonite are not enough to open the montmorillonite alone by its own hydration expansion force. The symbiosis, mosaic, and wrapping conditions among the three, especially the calcium-based bentonite with high layer charge, cannot be separated and removed by ordinary hydrocyclones, which has become the main factor affecting the quality of montmorillonite purification, and is also the main factor affecting the quality of montmorillonite purification. Difficulties in stone purification technology

[0003]As the market demand for montmorillonite increases, high-quality montmorillonite mines are decreasing, and low-content montmorillonite cannot be used by the market. Traditional montmorillonite purification usually adopts the process of dissolving raw ore-beating-swirl-refiltering-drying, which consumes a lot of water resources, and the water content of the filter cake is more than 60%, which is difficult to dry

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