FIELD: mining industry.
SUBSTANCE: invention relates to developing methods of reusing all valuable components recovered in processing of siliceous minerals and calcite. Processing technology is characterized by that, within a single production complex, organized is synchronic work of (i) sealed reactors designed for recovering silica from siliceous mineral heated to 400-700оС, (ii) electrolyzers for gas-phase electrolysis of silicic acid connected over pipelines to reactors and electrolysis product storage tanks, and (iii) furnaces for thermal decomposition of calcite connected over communication lines to ammonium aminoformate production installations. In reactors, calculated amounts of water are incorporated into the heated bulk of siliceous material at pressure 320-450 bar in order to bubbling this material and to leading water steam density inside reactor to 0.1 g/cm3. As a consequence, silica is recovered from siliceous mineral and silicic acid is formed in gas phase. Electrolysis of the latter gives oxygen used for nitric acid production, whereas hydrogen with atmospheric nitrogen are used for synthesis of ammonia, which is used for disposal of carbon dioxide formed during thermal decomposition of calcite to produce ammonium aminoformate. Silica precipitates in electrolyzers is used to fabricate quartz glass products.
EFFECT: prevented loss of valuable calcite and siliceous mineral processing products due to synchronization of work of production plant components.
