METHOD OF PRODUCTION OF MULLITE OUT OF THE QUARTZ-TOPAZ RAW MATERIALS

摘要

FIELD: chemical industry; methods of production of mullite out of the quartz-topaz raw materials.;SUBSTANCE: the invention is pertaining to the field of a chemical industry, chemical technology and materials technology. The method of production of mullite includes: comminution of the source quartz-topaz raw materials; separation of impurities by lixiviation using treatment of the raw materials with a hydrochloric acid with concentration of 10-38 % within 0.5-2 hours; a water flushing; separation of redundant silicon oxide in the form of ammonium hexafluorosilicate by means of ammonium bifluoride; calcination of the gained product at the temperature of 1200°-1300°C. The technical result of the invention is production of the microfibrous mullite (microfibers of the mullite crystal may reach 200 microns in length with a fiber depth - about 1 micron) of high quality and in the commercial scale.;EFFECT: the invention ensures production of the microfibrous mullite (microfibers of the mullite crystal may reach 200 microns in length with a fiber depth - about 1 micron) of high quality and in the commercial scale.;1 ex