Environmental evaluation of the effects of using chromic waste in the production of chromium compounds

The extreme of the quality indicator WJ was determined as a measure of the difference between the quantity of chromic waste introduced into the process and that obtained from it. It was determined for the elaborated technological alternatives of the sodium chromate production process which uses chromic waste as a substitute for natural raw materials. The technological process quality TJ was defined; it evaluates each of the technological alternatives taking into consideration the environmental figures. The most advantageous alternative is characterised by a negative balance of chromic waste—40% more chromic waste is introduced into the process than is obtained from it. Also, the consumption of chromium-containing raw materials decreases by 63% and process efficiency increases by 16.1% in comparison to the standard dolomite method.