Beneficiation process for pulverized mine of specularite in alpine region

Abstract

The invention belongs to the technical field of iron ore beneficiation, and in particular relates to a beneficiation process for pulverized mine of specularite in an alpine region. The method provided by the invention comprises the steps of beneficiation before roasting, suspended magnetization roasting and beneficiation after roasting. According to the method, the recorded granularity of materials, in the step of beneficiation before roasting, which are fed into suspended Bayer is less than or equal to 0.3 mm, and adapts to the suspended magnetization roasting process, the beneficiation index of the pulverized mine of the specularite is further increased through the step of beneficiation after roasting, the pulverized mine antifreezing problem is solved, filtering operation in the alpine region is effectively realized, and the beneficiation process has the advantages of energy conservation and environmental friendliness.

Description

Technical field [0001] The invention belongs to the technical field of iron ore beneficiation, and particularly relates to a beneficiation process for specularite fines in high-cold areas. Background technique [0002] There are abundant specular iron ore in the Jiayuguan area of ​​Gansu, my country. The main types of ore industries in this area are specular iron ore, specular iron siderite mixed ore and specular iron limonite mixed ore. Among them, the optional minerals specularite and limonite are weakly magnetic minerals. The current beneficiation method is two-stage grinding-strong magnetic roughing-roughing tailings coarse subdivision-strong magnetic re-separation. The JISCO concentrator adopts this method The final iron concentrate grade is 45.46%, Si0 2 The grade is 11.66%, and the iron recovery rate is 65.3%. Practice shows that the process has low metal recovery rate and poor quality concentrate. In order to improve the iron recovery rate and grade of specularite, reduc...

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Problems solved by technology

Due to the small gaps in the powdery ore, the air cannot circulate, so the shaft furnace roasting can only be used for the roasting of lumpy ore

Although the rotary kiln can achieve full-grain roasting, the production practice of roasting powdered ore in the rotary kiln shows that the roasting of the rotary kiln takes more than 60 minutes, the ore is not uniformly reduced, the roasting cost is high, the equipment investment is large, and the heat utilization rate is low. Material, fuel, water content, roasting atmosphere, temperature, etc. are strictly required, and precise control is required, otherwise it is easy to form kiln rings, which makes it difficult for industrial production to go smoothly. Therefore, rotary kiln roasting specular iron ore has not been used in industrial construction in my country.

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