Through the utilization of resources test chromium leaching residue can be prepared by leaching tests available Cr6 + average leaching rate of 99.94%, ΣCr average leaching rate of 86.55%, Fe average leaching rate of 94.72%. By extraction - trans extraction - precipitation step can be obtained more than 99% or more and 98.5% iron hydroxide, chromium hydroxide; raffinate by treatment process test, obtain the primary industry standard grade of 97% or more of calcium sulfate (whiskers) , more than 40% of magnesium carbonate and 98% sodium chloride industry, the raffinate recycle process returns leaching step, to achieve a product hydrochloric acid and chromium utilization of resources.
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