Physico-chemical features of acid decomposition of dolomite

The results of studies the physico-chemical regularities acid decomposition magnesium-containing raw materials are presented and optimal technological mode individual stages obtaining magnesium sulfate is determined. It has been established that process based on dolomite includes following stages: with sulfuric acid; filtration resulting suspension separation calcium insoluble residue subsequent washing; crystallization sulfate; drying target product. main parameters determine stage are: rate acid, duration decomposition, method procedure for introducing reagents, content in liquid phase suspension. In this case, concentration cannot be considered as parameter, since its numerical value selected depending final phase, which turn determined by solubility water. proven use a flocculant at provides an increased rate, improved performance, well keeping filter cloth uncontaminated. chemical X-ray analyzes confirmed obtained from domestic composition corresponds to foreign types - magnesite, brucite fully complies requirements TU 2141016-32496445-00 “Magnesium sulfate”.