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A kind of method of gravity separation of gibbsite type bauxite

A gibbsite type and bauxite technology, applied in the direction of solid separation, etc., can solve the problems of a large number of flotation reagents, complicated process, difficult to use, etc., achieve good sustainable development, widen source channels, and high comprehensive utilization rate Effect

Active Publication Date: 2022-05-06
湖南绿脉环保科技股份有限公司
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Problems solved by technology

However, the flotation process is not only complicated and long, but also requires a large amount of flotation reagents, which seriously pollutes the environment; magnetic separation or reduction magnetization roasting magnetic separation deferrification method has simple equipment and fast processing speed, but the iron removal efficiency is low; although chemical The leaching method has a higher removal rate of iron in bauxite than the physical method, but the acid leaching waste liquid contains a large amount of metal ions such as iron, aluminum, potassium, magnesium, etc., which must be treated before being discharged, which not only increases the efficiency of iron removal. Cost, there are also problems such as environmental pollution; while the time required for biological beneficiation to remove iron is long, and the removal rate of iron is not high
Not only that, the above-mentioned process method will also produce a large amount of red mud, which is not only difficult to use, but also causes waste of resources and environmental pollution.
[0004] CN105107618A discloses a gravity separation method of sedimentary bauxite, which is to use the difference in the embedded particle size of each mineral in the sedimentary ore to carry out gravity separation. However, due to the failure of controlled grinding, only the ore is ground Fine, easy to form over-grinding, resulting in the loss of target minerals in the fine-grained grade and high energy consumption
However, this method still only focuses on sorting, and does not study the quality of the sorting feed, that is, the composition of the particle size distribution.
[0006] CN1403205A discloses a bauxite beneficiation method, mainly for diaspore type bauxite, although the method considers the difference in flotation properties of coarse and fine grained minerals, flotation is still required, and Using flotation agents, there is a problem of agent pollution
However, this method is more complicated
[0008] Therefore, research and design a low-cost, high-efficiency process method to deal with high iron in gibbsite-type bauxite, and solve the existing problems of low iron removal rate, difficult utilization of iron resources, and large amount of red mud. Improving the comprehensive utilization rate of resources will be of great significance to my country's aluminum industry and steel industry production

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  • A kind of method of gravity separation of gibbsite type bauxite

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Experimental program
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Effect test

Embodiment 1

[0040] (1) After crushing 1t of gibbsite-type bauxite 1, send it into the ball mill, and the filling rate of steel balls is 28% (mass percentage of steel balls: large ball Ф80mm: 20%, medium ball Ф55mm: 60% , small ball Ф35mm: 20%), carry out dry grinding until the mass content of particle size ≤ 74 μm is 64.56%, the mass content of particle size ≤ 10 μm is 17.12%, and the monomer dissociation degree of each mineral is 72%. Mineral powder;

[0041] (2) Slurry the mineral powder obtained in step (1) with sodium aluminate solution until the mass concentration of the pulp is 10%, and then send it into the jig machine, and perform wet grinding at 25°C, with a stroke of 15mm and a stroke frequency of 120 times / min. After gravity separation, 0.745t (dry basis) aluminum concentrate 1 and 0.255t (dry basis) aluminum-bearing iron ore 1 were obtained respectively (the main components are shown in Table 1).

[0042] The process of wet gravity separation in step (2) is roughing, sweeping...

Embodiment 2

[0044] (1) After crushing 1t of gibbsite-type bauxite 2, send it to the rod mill, and the steel rod filling rate is 25% (mass percentage of steel rod: Ф70mm: 60%, Ф60mm: 40%), Carry out dry grinding until the mass content of the particle size ≤ 74 μm is 72.3%, the mass content of the particle size ≤ 10 μm is 28.35%, and the monomer dissociation degree of each mineral is 88%, and the ore powder is obtained;

[0045] (2) Slurry the mineral powder obtained in step (1) with water until the mass concentration of the pulp is 8%, send it to a shaker, and carry out wet gravity separation at 20°C, with a stroke of 10mm and a stroke frequency of 160 times / min. 0.802t (dry basis) aluminum concentrate 2 and 0.198t (dry basis) aluminum-bearing iron ore 2 were obtained respectively (the main components are shown in Table 1).

[0046] The process of wet gravity separation in step (2) is roughing, sweeping and refining, and the middlings obtained from sweeping and refining are returned in seq...

Embodiment 3

[0048] (1) After crushing 1t of gibbsite-type bauxite 3, send it to the rod mill, and the steel rod filling rate is 27% (the mass percentage of the steel rod is: Ф70mm: 40%, Ф60mm: 50%, Ф50mm : 10%), carry out dry grinding until the mass content of the particle size ≤ 74 μm is 76.0%, the mass content of the particle size ≤ 10 μm is 24.63%, and the monomer dissociation degree of each mineral is 79%, and the ore powder is obtained;

[0049] (2) Send the ore powder obtained in step (1) into the cyclone separator, under the wind pressure of 0.15MPa and the feed concentration of 4.0kg / m 3 Next, after dry gravity separation, 0.736t (dry basis) aluminum concentrate 3 and 0.264t (dry basis) aluminum-containing iron ore 3 were obtained respectively (the main components are shown in Table 1).

[0050] The process of the dry re-selection in step (2) is roughing, sweeping and concentrating, and the middlings obtained from the sweeping and concentrating are concentrated and returned to the...

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Abstract

A method for gravity separation of gibbsite-type bauxite, comprising the following steps: (1) after crushing the gibbsite-type bauxite, performing dry or wet grinding to obtain mineral powder or pulp; (2) Perform dry or wet gravity separation on the mineral powder or pulp obtained in step (1) to obtain aluminum concentrate and aluminium-containing iron ore respectively. In the low-iron, high-aluminum-silicon-ratio aluminum concentrate obtained by the method of the present invention, the alumina grade>42%, the alumina recovery rate>74%, A / S>12, and the mass content of iron oxide<18%, can be used as alumina Raw materials for production; at the same time, in the obtained aluminum-containing iron ore, the mass content of iron oxide is >51%, and the recovery rate of iron oxide is >50%, which can be used as raw materials for steel production; the method of the invention has simple process, low cost, and no chemical addition , The amount of red mud produced is small, economical and environmentally friendly, and the resource utilization rate is high, which is suitable for industrial production.

Description

technical field [0001] The invention relates to a method for gravity separation of bauxite, in particular to a method for gravity separation of gibbsite type bauxite. Background technique [0002] In recent years, my country's high-quality iron ore resources and aluminum ore resources have become increasingly scarce, and the import volume of iron ore and bauxite has risen sharply. The high degree of foreign dependence has seriously affected the strategic security of the supply of raw materials for the iron and steel industry and the aluminum industry. In this context, the rational and efficient development and utilization of high-speed rail bauxite resources is imminent. [0003] At present, the beneficiation methods of high-speed iron bauxite resources mainly include flotation, magnetic separation or reduction magnetization roasting magnetic separation, chemical leaching method, biological method and so on. However, the flotation process is not only complicated and long, b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B03B9/00
CPCB03B9/00
Inventor 陈湘清邹春林陈黎军谢舒珊
Owner 湖南绿脉环保科技股份有限公司
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