Recycling and metal recovery technology for stainless steel pickling liquors.
Stephenson-JB; Hogan-JC; Kaplan-RS
Environ Prog 1984 Feb; 3(1):50-53
Most stainless steels require a final treatment in nitric and/or hydrofluoric acid pickling baths for the removal of oxide scales formed during processing to final gauge and shape. These pickling baths become ineffective as their metal content increases. The baths appear to be particularly sensitive to the concentration of iron. Conventional operating procedures call for the replacement and disposal of the spent acids. The high cost of waste acid disposal and the loss of the valuable nickel and chromium they contain are important considerations. This review covers recovery and recycling processes for spent nitric and hydrofluoric acid pickle liquors generated during the production of stainless steels.
Waste-treatment; Acids; Steel-industry; Stainless-steel; Metals
OP; Journal Article