Re-calcination and extraction process for the detoxification and

Details Re-calcination and extraction process for the detoxification and Re-calcination and extraction process for the detoxification and

1992-04-08

1995-03-07

Straub, Gary P.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group vib metal

423 55, 423 57, B01D 2100

Patent

active

053956010

ABSTRACT:
A re-calcination and extraction process for the detoxification and comprehensive utilization of chromic residues, comprising adding small amount of residue ore powder, sodium carbonate, or additionally, a certain amount of coke powder to the poisonous chromic residues, and calcining the mixture in a re-calcinating apparatus at 1000.degree.-1200.degree. C., for 30-60 minutes. The re-calcined grog is extracted with water, to obtain an extractive liquor containing sodium chromate. The extractive liquor can be used to produce chromium oxide, basic chromium sulfate or medium chrome yellow; while the extracted residues can be sintered at high temperatures with iron ore powder and coke to obtain a massive self-melting sintered iron, which can be further converted to a low-chromium cast iron. This process can thoroughly detoxify the chromic residues, effectively recover Cr2O3 and remove water-soluble Cr+6, whereby various important industrial materials are produced. The method brings very good economical and environmental benefits.

REFERENCES:
patent: 2292495 (1942-08-01), Udy
patent: 2332415 (1943-10-01), Udy
patent: 5215727 (1993-06-01), Zeller, III et al.

Affiliated with

Also associated with

Rating

Re-calcination and extraction process for the detoxification and does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Re-calcination and extraction process for the detoxification and, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Re-calcination and extraction process for the detoxification and will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1404597