Stainless steel cold rolling sludge recycling method

Abstract

The invention relates to the technical field of industrial harmful waste recycling, and discloses a stainless steel cold rolling sludge recycling method which comprises the following steps of: (1) carrying out distinguishing treatment; (2) carrying out mixing treatment; (3) carrying out primary precipitation; (4) obtaining heavy metal sludge; (5) carrying out secondary precipitation; and (6) obtaining calcium salt sludge. According to the stainless steel cold rolling sludge recycling method, through two-stage treatment and segmented recovery, a heavy metal sludge cake and a calcium salt sludgecake are obtained conveniently, the heavy metal sludge cake is mainly composed of hydroxides of heavy metals such as Fe, Cr and Ni, the heavy metal sludge cake can be returned to a metallurgy processand utilized as a steelmaking slag former or sinter or pellet ore and other raw materials after being dried, the calcium salt sludge cake can be used as a cement mineralizer, a building material rawmaterial or a metallurgical auxiliary material, and can also fill up the landfill or be stacked as common industrial waste due to low heavy metal content, and practice shows that after the stainless steel cold rolling pickling wastewater is subjected to segmented treatment, mixed sludge source reduction is realized, and two sections of sludge are easier to comprehensively utilize.

Description

technical field [0001] The invention relates to the technical field of recycling industrial hazardous waste, in particular to a method for recycling and treating stainless steel cold rolling sludge. Background technique [0002] The surface treatment of stainless steel cold-rolled products involves combined processes such as shot blasting, high-temperature alkali leaching, molten salt electrolysis, mixed acid pickling, and multi-stage rinsing. The discharged multi-channel wastewater includes neutral salt waste liquid, mixed acid waste liquid, and fluorine-containing waste water , rinsing wastewater and flushing water, etc., have the characteristics of complex composition, large output, high acidity, strong toxicity and serious hazards. [0003] At present, due to factors such as mature technology, convenient operation and maintenance, domestic and foreign stainless steel enterprises mainly divide multi-channel wastewater into two categories: neutral salt wastewater containin...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention provides a method for the recycling and treatment of stainless steel cold rolling sludge, which has the advantages of high recycling efficiency and low recycling cost, and solves the problem of coexistence of large quantities and wide areas, hazards and resources heavy metal sludge, there is no economical and effective treatment and comprehensive utilization technology with promotional value at home and abroad.