Title: Chromium-rare earth hides-tanning waste chromium liquid closed cycle technology
Application Number: 90103170 Application Date: 1990.06.21
Publication Number: 1050901 Publication Date: 1991.04.24
Approval Pub. Date: Granted Pub. Date: 1993.05.12
International Classifi-cation: C14C3/06
Applicant(s) Name: Leather Tanning Factory, Bijie County, Guizhou Pro Address: 551700
Inventor(s) Name: Deng Peiming, Wu Xingchi
Attorney & Agent: ZHOU SUXIA
Abstract:
     The invention is related to tanning technology, specially the circulation utilization of chroming waste liquid. With the invention environment pollution is reduced. The waste liquid containing chromium is delivered into rotation drum, pH value and salt content are regulated. After raw hides are put in the liquid, some fresh chroming liquid, rare elements and deceiving agent are added. The temp. is regulated, alkali is extracted. The used waste liquid is delivered into the collecting pond. With the invention sodium bichromate economized by 40%, drained waste liquid containing chromium is reduced by 98%. The processed leather is soft, well-developed. The Cr content in waste liquid meets the state standard.
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