The way to prevent the harm of chromium slag is to treat it at high temperature to eliminate its toxicity. Hexavalent chromium can be reduced to trivalent chromium with less toxicity under acidic conditions with reducing agent, alkaline conditions with alkali metal sulfide and hydrosulfide, or high temperature and anoxic conditions with sulfur, carbon and carbide. The utilization of chromium slag mainly includes the following aspects: using chromium slag, limestone, clay and other raw materials to make cement according to ordinary portland cement and cement clinker. Using chromium slag, blast furnace slag, converter steel slag and portland cement clinker after carbon reduction, adding about 5% gypsum, steel slag cement with less clinker can also be made.
In addition, chromium slag can also replace chromium ore powder as a turquoise colorant for glass. Water-quenched chromium slag can also be used as cement mixture, mineral wool raw material, heat-resistant cementing material, molten cement raw material and so on. In Japan, reducing agents such as ferrous sulfate and ferrous oxide are added to detoxified chromium slag to make plastic curing materials or as fillers for gypsum boards.
Chromium slag is toxic and difficult to transport, and its utilization has not yet been developed.