Method for separating and purifying low-grade attapulgite by using dispersant-assisted rotary liquid membrane reactor

• Main Authors: CHEN XIN, JI HONGAN, LI HUIYU, WANG XINGPENG, WANG LIZHONG, FENG YONGJUN, ZHANG YONGPIN, LIU XIAOLI
• Format: Patent
• Language: Chinese; English
• Published: 03.02.2023
• Subjects: CHEMISTRY; COMPOUNDS THEREOF; INORGANIC CHEMISTRY; METALLURGY; NON-METALLIC ELEMENTS

The invention provides a purification method for low-grade attapulgite, which realizes and widens the high-value application prospect of the low-grade attapulgite. Based on the adjustability of intrinsic double electric layers of attapulgite and the density difference of mineral substances, high-valence phosphate is cooperatively introduced, the mechanical shearing effect is achieved, and a dispersant-assisted rotating liquid membrane reactor separation strategy is developed. According to the strategy, the intrinsic double electric layers of the attapulgite can be regulated and controlled, the repulsive force between attapulgite crystal beams is improved, and separation of the attapulgite and impurity minerals is promoted. The purity of the low-grade attapulgite can be improved from 3% to more than 80% through a dispersant-assisted rotary liquid membrane reactor separation strategy. The purified attapulgite shows improved adsorption performance in adsorption application of the colored dye, and the adsorption