A method and system for comprehensive utilization of dry separation of bauxite

Abstract

The invention belongs to the technical field of mineral separation, and particularly relates to a comprehensive utilization method and system for dry separation of bauxite. The method mainly comprises the following technological steps: crushing raw bauxite into coarse ore of which the grain size is smaller than or equal to 50 mm, and then conveying the coarse ore into a roller dryer; after drying, carrying out secondary crushing to obtain ore of which the grain size is smaller than or equal to 20 mm; carrying out separation by adopting a vibrating screen to obtain aluminum concentrate and tailings; conveying the tailings to a grinding device for being grinded into powder of which the grain size is smaller than or equal to 0.1 mm, and then carrying out separation by adopting an o-sepa powder concentrator to obtain aluminum concentrate and tailings soil; treating the tailings soil by adopting a dry magnetic separator to obtain aluminum concentrate, iron concentrate powder and tailing soil slag; and conveying the tailing soil slag into a tailings bin, so as to finish dry separation. The method and the system provided by the invention break free of the conventional wet-process thinking, effectively subject the bauxite to separation and concentration, achieves comprehensive utilization of the tailings, effectively reduces the environmental risk in a tailings stockpiling process, and has good resource, environmental and ecological benefits.

Description

technical field [0001] The invention belongs to the technical field of mineral separation and separation, and specifically relates to a method and system for comprehensive utilization of dry separation of bauxite. Background technique [0002] Bauxite refers to the general term for ores that can be used in industry, with gibbsite, boehmite or diaspore as the main minerals. Bauxite has a wide range of uses in my country's industrial field, and the annual demand for bauxite in my country is huge. [0003] my country is rich in bauxite resources, which are widely distributed in Guangxi, Henan, Shanxi, Guizhou and other places. It is divided into two types: sedimentary type and accumulation type. The characteristics of accumulation type bauxite are medium aluminum, low silicon, low sulfur, high iron, trioxide The contents of dialuminum and ferric oxide show an obvious negative phase relationship, and the correlation coefficient is -0.92. The main mineral in the ore is diaspore, ...

AI Technical Summary

Problems solved by technology

[0010] 1. The tailings sludge produced by mineral processing is all discharged into the tailings pond, which cannot be used, and there is a potential safety hazard of polluting groundwater resources;

[0011] 2. The factory building is fixed, and 30%-40% of the soil is transported to the beneficiation plant, which increases the transportation cost;

[0012] 3. The water consumption of processing one ton of bauxite is about 2.5 tons, which is a serious waste of water resources;

[0013] 4. In the process of water separation, the mud is continuously discharged into the tailings pond, which cannot reduce the moisture content, but blocks the evaporation channel of the previous sludge discharge, which will only increase the water content of the tailings pond. The tailings pond alone will There are major safety hazards such as leakage, dam collapse, landslide, flooding and drowning;

[0014] 5. The iron content in bauxite is too high, which reduces the stand-alone production capacity of the equipment, increases production energy consumption, causes difficulty in red mud settlement, and affects the quality of finished alumina. The production cost of alumina is high

Although it discloses the method of using a drying drum, it does not disclose the internal structure of the drum. Its background technology also clearly states that the mud content generally accounts for 60% of the raw ore. Such raw materials are in a viscous state, which is easy There is a "sticky" phenomenon inside the cylinder, and the length of common drying drums is more than ten meters or even twenty or thirty meters, which is not easy to achieve the applicant's expected purpose, making the "dry selection" effect unsatisfactory

At the same time, there is no technical solution or enlightenment on how to separate or screen iron-bearing bauxite and tailings.

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