METHOD OF LITHIFYING VISCO-PLASTIC INDUSTRIAL WASTES Russian patent published in 2004 - IPC

FIELD: lithifying of visco-plastic industrial wastes and bottom slime and sediments.

SUBSTANCE: proposed method includes introduction of coagulating additives into reservoir containing visco-plastic industrial wastes and acting on them with electric current by means of metal electrodes; used as reservoirs for visco-plastic wastes are accumulating ponds; wastes are subjected to action by alternating current; metal electrodes are immersed in pods. For obtaining required hardness of wastes being lithified, depth of submergence of Vicat needle is measured before action of current h₀ and in the course of action of current h_t; relative coefficient of mechanical strength of medium being lithified is determined by the following relationship: K=h_t/h₀; time of passing of electric current required for obtaining the required hardness of wastes being lithified is found from the following relationship: t=1/J(1-K), where t is time of passing of alternating current, J is force of current; used as coagulating additives are vinyl pyrrolidone or cetyl pyridinium chloride.

EFFECT: enhanced efficiency; low cost of process.

1 dwg, 1 ex