Technology for the management of the lazy reagent dichromate of ammonium by means of their conversion in ceramic pigment

Abstract

A technology for the management of the obsolete reagent, (NH4)
2Cr2O7  by being converted into chromium oxide (III) is offered. Use tests were carried out in the ceramic factory "José L Tassende" with
good results. The chromium content into the obtained oxide was determined, which was in the range from 98, 75 to 98, 88 due to the accidental errors for a grade of security of 0, 95 corroborating a good purity. The impact of the investigation is evidenced in the economic aspect: 500 g of ammonium dichromate would cost 67, 40 USD and of chromium oxide to 98 % 26, 30 USD, so it can be calculated that the 200
kg of dichromate that existed like obsolete reagent would cost 26 960, 00 USD, and of them can be obtained it 120,634 kg of oxide that can  be used as ceramic pigment, which would cost 6 345, 34USD. About environmental matter, a mass of 200 kg of the obsolete reagent ammonium dichromate is managed which didn't have foreseen use and it was to be disposed, what is dangerous for the environment given the characteristics of high toxicity, carcinogenic and mutagenic hazard of this
chemical substance. The used procedure does not generate significant expenses and it allows the use of the reagent without risks for the environment.