SHS membranes based on materials of mica-like structure

Abstract

The possibility of synthesizing a functional porous material of a mica-like structure to manufacture filter membranes for purification of liquids and gases, in particular tap water, was investigated. Mixtures of available powders based on mineral raw materials — quartz sand (SiO2) and Karelian schungite with reducing agents and secondary cryolite, a product of processing of fluorine-containing wastes of aluminum production, were used for the synthesis. The synthesis was carried out in the furnace at T = 930°C in the atmosphere of air at P = 1 atm. A ceramic filter membrane 40 mm in diameter and ~ 5 mm in height was synthesized. The size of the open pores in the synthesized sample, which is measured according to GOST 26849-86, is 1-3 μm. The bending strength is 5.5–6 MPa. The product has a porosity of ~ 60% and an open porosity of up to 98%. The synthesized sample efficiently purifies the tap water from the high content of heavy metal ions and reduces the hardness of the water by 30%.