Experimental Study on Comprehensive Recovery of Low-grade Sulphur and Phosphorus Resources from Fine Iron Tailings
Fine-grained iron ore tailings in Handan,Hebei province contained valuable minerals such as low-grade pyrite and apatite,which had high recovery value.Based on the process mineralogy study of iron tailings containing S 1.12%and P2O5 2.20%,the sequential preferential flotation process of sulfur and phosphorus was adopted to investigate the effects of pH value of pulp,types and dosage of inhibitors and collectors on the flotation recovery of sulfur and phosphorus from iron tailings.The results showed that the optimum conditions for sulfur flotation are as follows:pH=6～7,H2SO4 dosage of 600 g/t,collector butyl xanthate and ethyl xanthate dosage of 50 g/t,the optimum conditions for phosphorus flotation are as follows:pH=10,Na2CO3 dosage of 800 g/t,inhibitor sodium silicate dosage of 200 g/t and collector sodium oleate dosage 750 g/t.A sulfur concentrate with S grade of 41.28%and recovery of 88.83%and a phosphorus concentrate with P2O5 grade of 31.11%and recovery of 78.62%were obtained by the locked-cycle flotation process of one roughing,one scavenging and three cleanings,which realized the effective separation and efficient recovery of low-grade sulfur and phosphorus minerals in the iron tailings.The research results provided a reference and technical support for the comprehensive recovery of low-grade sulfur and phosphorus resources in similar fine-grained iron tailings.
fine iron tailingspyriteapatitecomprehensive utilization of sulfur and phosphorus
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