Abstract: The harmless disposal and utilization of ferrochrome slag is mainly in cement building materials.However，due to inadequate understanding of the dissolution rule，hydration reaction degree and hydration products of water soluble Cr6+ in the solidification and curing ferrochromium slag cemented waste，the large scale safety utilization of ferrochrome slag resources was restricted.Taking a plant′s ferrochrome slag in Qinghai Province as research objective，its dissolution rule and hydration products of water soluble Cr6+ were investigated.Results showed water soluble Cr6+ and Cr3+ participated in the hydration reaction of cement，forming stable hydration products.With the increasing of the doped ferrochrome slag，the total mass fraction of water soluble chromium in the hydration reaction process of the cement-ferrochrome slag compound cementitious material had a ascend trend.When the mass fraction of doped ferrochrome slag was less than 15%，the total mass fraction of water soluble chromium was 0.000 19%，the product meets the standard of utilizing ferrochrome slag as the cement mixing material. The optimum ferrochrome slag′s doping amount for cement was 10%.

Key words: ferrochrome slag, water-soluble Cr（Ⅵ）, cement solidification