INNOVATIVE TECHNOLOGY FOR PROCESSING PHOSPHORUS INDUSTRY WASTE

Abstract

Phosphorus-containing waste utilization is a topical problem of chemical industry. The sludge is stored in sludge reservoirs located on huge ground areas. When sludge utilization and sludge reservoir liquidation the harmful waste influence on soil will be stopped and big areas will come free for economic land-utilization as well as raw material base for mineral fertilizer production will be expanded. Therefore, the research of phosphorus-containing sludge decomposition by sulphuric acid with following semi-product granulation by phosphoric acid ammoniating solution has been performed. Optimal parameters of the technological mode of phosphorus-containing sludge decomposition and semi-product granulation have been determined. The effect of reduced consumption coefficient of sulphuric acid in concentration and temperature wide range was studied. The process of semi-product granulation by its humidifying with phosphoric acid ammoniating solution was investigated. Physical-mechanical properties of the product obtained from phosphorus-containing sludge were investigated. Positive influence of phosphoric acid ammoniating solution additive on physical-mechanical properties of the product was revealed. It is shown that the product contains nutrients of nitrogen, phosphorus and potassium; it isn’t practically hygroscopic, caked and granules have high mechanical strength. The possibility has been proved and the technology of phosphorus-containing sludge processing into NPK-fertilizers has been developed.