Effect of technological conditions of leaching experiment on grade of low-phosphorus iron ore in preparation process

Spectrum analysis, chemical composition analysis, determination of iron phase and the modes of occurrence on the ore of high phosphorus hematite-1imonite had been studied by the paper. According to the character of hematite-1imonite ore, leaching experiment were done by choosing different hydrochloric acid and sulfuric acid respectively. Different technology conditions of best leaching acid was studied in the concentration of acid,leaching temperature, liquid-to-solid ratio and leaching time.Best technology conditions were shown:the concentration of H₂SO₄ is 10%, leaching temperature is 60℃, liquid-to-solid ratio is 2.5:1 and leaching time is 15 minutes, an ideal concentrate was obtained,which had the iron grade of 58.96%,the phosphorous grade of 0.222%, and the iron recovery of 75.08%.