No abstract

No abstract

No abstract

No abstract

Basic requirements are formulated for starting materials for manufacturing porous ceramic diaphragms, and alumina-containing raw materials of domestic and overseas production are studied. Porous ceramic is manufactured with 35% open porosity and ultimate strength in compression of 72 MPa.Keywords: alumina, porous ceramic, diaphragm.Porous ceramic diaphragms exhibit a number of unique properties, and due to this have a broad range of applications. The main advantages of ceramic diaphragms compared with those manufactured from other materials are an increase in structural mechanical strength and stiffness, corrosion and heat resistance, operating property stability with prolonged use, the possibility of object repeated regeneration, and resistance to action of bacteria. Ceramic diaphragms are readily cleaned by calcining, reverse flow of water or other liquid. These properties make it possible to use ceramic filter elements during separation of solutions over a wide pH range (from 0 to 14), and with high temperature and pressure (1 -10 MPa). Ceramic diaphragms are reliable and long lasting in operation [1,2]. However, in order to manufacture ceramic materials high-temperature firing is required, during which there is formation of the structure required. The sintering temperature is reduced by introducing sintering additions into a charge or use of special materials in order to obtain a porous structure [3].During mass production of microporous diaphragms it is interesting to prepare them on the basis of aluminum oxide, as the most widespread and available material. Some of the powders offered on the market have been analyzed in this work.In selecting aluminum oxide Al 2 O 3 powder suitable for manufacturing porous diaphragms, one is guided by the following criteria established by experiment.1. Aluminum oxide should be in the form of corundum.