Abstract:
The article is devoted to the development of the technological process for the processing chromium containing
technogenic materials, which includes their roasting in the presence of sodium carbonate and the subsequent
leaching of chromium from the sinter with water. Using the method of stochastic determinated design
of the experiment, a five-factor mathematical model of extracting chromium into a cake was obtained. It is
determined that in order to achieve the minimum recovery of chromium in the cake and, accordingly, the
most complete isolation of the given metal into the solution, it is necessary to conduct batch roasting under
the following conditions: troast. =960 ºС, τroast.= 3h, N = 60 %, and leaching at τleach. =2h and tleach. = 60 ºС.
The chemistry of the passing processes is shown. It is shown the usefulness of the obtained mathematical
equation for making predictions that are more accurate when introducing the values of the arguments within
the given limits of their variation into the given equation and less accurate at a considerable distance from
these limits. Calculation in the indicated calcination conditions shows that the recovery of chromium in the
solution increases with increasing firing temperature, time of its maintenance and consumption of Na2CO3.
