Bauxite surface preprocessing-reverse floatation desiliconizing method

Abstract

A method of a pretreatment that is a desilication of bauxite surface by a reverse flotation relates to a method of the flotation towards diasporic bauxite, including the courses of grinding, a solid-liquid separation and the reverse flotation. The method is characterized in that before the desilication of the bauxite mineral by the reverse flotation, the surface of the mineral is pretreated by hot alkaline solution. The method of the intention can make a concentrate grade (an alumina-silica ratio) after the desilication by the reverse flotation improved 0.5 to 1 than the concentrate grade after the ordinary desilication by the reverse flotation and make a coefficient of recovery increase by 2 percent to 8 percent. The chemical entrainments of coarse particles are greatly reduced. A concentration adjustment of the flotation system of the present invention is convenient, and the balancing time is short, at the same time novel water can be used for further washing a red mud, which can reduce an alkalescence of the red mud and decrease the pollution influence on environment. The water after washing red mud is added into a grinding machine for the treatment of ore surface as the recycle utilization.

Description

technical field [0001] A bauxite surface pretreatment-reverse flotation desiliconization method relates to a diaspore type bauxite flotation method. technical background [0002] It is one of the effective ways for the sustainable development of my country's alumina industry to improve the aluminum-silicon ratio of the ore through mineral processing and desiliconization, and to rationally utilize the low-grade diaspore type ore. Among them, the reverse flotation desiliconization technology has obvious advantages: it conforms to the principle of floating less and suppressing more, and the amount of collector is small, which is beneficial to reduce the cost of mineral processing; the flotation concentrate has good filtration performance; it is easy to remove pyrophyllite and other silicon-containing Minerals can reduce scarring in the Bayer process; the recycling rate of backwater is high, and the environmental pollution is small; and the reverse flotation desilication concent...

AI Technical Summary

Problems solved by technology

However, many problems have also been exposed: the existing traditional equipment does not match the reverse flotation process; the lack of efficient diaspore inhibitors; the selectivity of collectors to aluminum-silicon minerals and the simultaneous collection of various silicic acids The ability of salt minerals is not good enough; the grade of desludge is high, and the foam mechanical inclusion is serious, resulting in high grade of tailings; the implementation of multi-stage dosing results in long flotation time and long process flow; the process index is not as good as that of positive flotation

[0004] In the grinding process of reverse flotation desiliconization of diaspore type bauxite, the main minerals diaspore, kaolinite, illite and pyrophyllite are ground, exposing a large amount of aluminum and silicon Surface active sites, these surface active sites interact with grinding media, unavoidable ions, and active sites, resulting in a large degree of contamination of surface active sites, while reducing the surface of diaspore minerals and aluminosilicate minerals In particular, the difference in the surface hydrophilic / hydrophobic properties of kaolinite, illite and pyrophyllite reduces the selectivity of the agent and affects the separation effect and efficiency; at the same time, under the premise of the particle size required by the flotation process, The dissociation of some mineral monomers is not complete, and the grade of Fulian Biomass is not high enough, resulting in a small difference in the number of active sites of aluminum and silicon on the surface of these minerals, which makes it difficult to separate or contain serious inclusions of this part of aluminum-silicon minerals, which affects the buoyancy. selected indicators

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