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Ore grinding flotation silicon-removing method of bauxite

A bauxite and flotation technology, applied in flotation, solid separation, etc., can solve the problems of low recovery rate of alumina, increase of classification process, over-grinding and polarization, etc., so as to improve flotation recovery rate and improve coarse The effect of particle size content and beneficiation cost reduction

Inactive Publication Date: 2011-07-13
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the bauxite particle size has been improved through the optimization of the grinding process and the intensified operation, it cannot fundamentally solve the problem
For diaspore-type bauxite, the target mineral diaspore is harder and brittle than gangue minerals, some minerals are easy to grind, while others are difficult to grind, and the classification efficiency of the equipment is not high, and repeated cycles Ore grinding is easy to over-grind and polarized; if coarse grinding is used, the separation index will be seriously affected, the ratio of aluminum to silicon in the tailings is high, and the recovery rate of alumina is low
In response to this problem, the patent 200710179654.5 adopted the method of coarse grinding-medium ore classification-coarse grain regrinding and re-election. Practice has proved that this process method is better, but it increases the classification process and prolongs the flow process; the fine grain of the tailings product is too large Many, tailings settlement brings problems
Patent 200610098704 selectively grinds high-grade coarse-grained grades to achieve coarse-grained rapid flotation and ensure the grade, recovery rate, and coarse-grained grade of the concentrate. However, the efficiency of pre-grading is low and the process operation High control requirements
[0004] For gibbsite-type bauxite and mixed-type bauxite, because the ore is relatively soft, traditional grinding makes muddy serious, and the separation effect is very poor, which causes great difficulties in separation, product dehydration and tailings settlement Therefore, flotation desilication of low-grade gibbsite and mixed bauxite is still in the laboratory research stage, and the fine particle size of flotation is an unsolved problem

Method used

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  • Ore grinding flotation silicon-removing method of bauxite
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  • Ore grinding flotation silicon-removing method of bauxite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The diaspore-type bauxite was used as the test ore sample. The chemical composition is shown in Table 1, and the mineral composition is shown in Table 2.

[0020] Table 1 Chemical composition of diaspore bauxite

[0021]

[0022] Table 2 Mineral phase composition of diaspore-type bauxite

[0023]

[0024] Process equipment: grid-type ball mill is used for primary grinding, vertical stirring mill is used for secondary grinding, flotation unit is external aerated mechanical stirring flotation machine, 2 flotation machines for primary flotation, 4 for secondary flotation Flotation machine.

[0025] Process flow: see process flow chart (attached figure 1 ).

[0026] Process parameters: the fineness of the first stage grinding is 70.58%, and the gas input of the vertical stirring mill is 5m 3 / h, the pharmaceutical system is a conventional positive flotation reagent system.

[0027] Process index: see table 3.

[0028] Table 3 Example 1 Flotation Index

[0029]

[0030] It can be seen f...

Embodiment 2

[0036] Taking gibbsite mixed bauxite as the test ore sample, its chemical composition is shown in Table 5, and the mineral composition is shown in Table 6.

[0037] Table 5 Chemical composition of gibbsite mixed bauxite

[0038] Table 6 Mineral phase composition of gibbsite mixed bauxite

[0039]

[0040] Process equipment: grid-type ball mill is used for primary grinding, vertical stirring mill is used for secondary grinding, flotation machine is external aerated mechanical stirring flotation machine, 1 flotation machine for primary flotation, 3 for secondary flotation Flotation machine.

[0041] Process flow: see process flow chart (attached figure 1 ).

[0042] Process parameters: the fineness of the first stage grinding is 30.58%, and the gas inlet of the vertical stirring mill is 3.5m 3 / h, the reagent system is a conventional anti-flotation reagent system.

[0043] Process index: see Table 7.

example 2

[0044] Table 7 Example 2 Flotation Index

[0045]

[0046] It can be seen from Table 7 that through the selection of the technological indicators of the invention patent, a good indicator with a concentrate aluminum-silicon ratio of 7.72 and a yield of 91.33% was obtained.

[0047] The product was screened and analyzed, and the screening results are shown in Table 8.

[0048] Table 8 Example 2 product screening analysis

[0049]

[0050] It can be seen from Table 8 that the content of -21μm in the concentrate is only 25.04, while the content of -21μm in the conventional process flow is about 50%, which greatly reduces the fine-grain level in the concentrate; the content of -21μm in the tailings is only It is 33.59%, and the content of fine particle grade has dropped significantly, laying a good foundation for subsequent settlement and product processing.

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Abstract

The invention relates to a process for removing impurities from bauxite, in particular to an ore grinding flotation silicon-removing method of bauxite, which comprises the steps of: carrying out primary floatation on the bauxite after rough grinding, wherein the floated foam is used as a concentrate product; carrying out secondary ore grinding on floating underflow; and carrying out secondary floatation after secondary ore grinding, wherein the floated foam is used as a concentrate product and the underflow is used as tailings to be discharged. The invention has the characteristics of proper granularity of flotation pulp, reasonable fraction distribution, shortened process flow, reduced mineral dressing cost and improved floatation recycling rate due to the adoption of reasonable configuration of ore grinding and floating and equipment selection.

Description

Technical field [0001] A method for desiliconization by grinding and flotation of bauxite relates to a method for desiliconization of bauxite, including the flotation and desiliconization of diaspore type, gibbsite type and mixed type bauxite. technical background [0002] The "new process of beneficiation-Bayer process for producing alumina" is the most competitive production process in line with the state of my country's bauxite resources, and has gradually reached a consensus in the industry. With the rapid development of my country's aluminum industry and the increasing dilution of bauxite resources, beneficiation and desiliconization are particularly important. [0003] At present, the positive flotation desiliconization technology of diaspore-type bauxite has been relatively mature, realized industrialization, and achieved good results. However, the flotation particle size and size distribution always affect the product settlement, Product filtration, process indicators, ene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03D1/00B03B1/00B03D103/02
Inventor 陈湘清陈兴华张建强
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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