This article presents considerations about meaning that has preliminary processing of chromium materials in process of sodium chromate production. This paper is divided into 2 main parts: theoretic introduction and description of laboratory researches (including final results and conclusions). The first one indicates primary reasons for establish the studies: threats, as hazardous emissions from chemical industry to the natural environment and opportunities, as sustainable growth and development of technologies reducing negative impact of production processes. Scientific and practical experience has been also presented shortly. In the second part necessary assumptions have been formulated, used materials and constitution of chromic charge have been specified, and finally/methods, terms and way of running the researches has been defined. As an effect of the analysis, technological indices of sodium chromate production has been calculated and then used as a base for discussion about gained results and to formulate final conclusions.