Desiliconization method for bauxite separated concentrate producing by using ultralow-grade raw ores

A bauxite and concentrate technology, applied in the field of mineral beneficiation, can solve the problems of continuous operation of the process, sedimentation of secondary fine mud, affecting the quality of concentrates, etc. good effect

Pending Publication Date: 2019-10-08
HENAN DONGDA TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The primary ore sludge plus the secondary ore sludge produced during the crushing and grinding process will greatly increase the consumption of reagents after entering the flotation system. The phenomenon of mechanical entrainment during the flotation process is serious and affects the quality of the concentrate, and a large amount of primary and secondary fine sludge settles , Dehydration is difficult, resulting in the continuous operation of the process. Therefore, how to carry out desiliconization, improve the ratio of silicon to aluminum, and ensure the production of ore dressing is a technical problem that must be solved.

Method used

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  • Desiliconization method for bauxite separated concentrate producing by using ultralow-grade raw ores
  • Desiliconization method for bauxite separated concentrate producing by using ultralow-grade raw ores

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The beneficiation index of embodiment 1 is shown in table 1 below.

[0041] product name Al2O3 SiO2 A / S Yield Raw ore 50.83 24.92 2.04 100% Concentrate 61.37 9.08 6.76 56.23% tailings 37.29 35.86 1.04 43.77%

[0042] Experiment 2, taking a coal mine in Shanxi as an example, the ultra-low-grade bauxite was subjected to two-stage closed-circuit crushing, two-stage closed-circuit grinding and classification, pre-selection of fine ore particles, micro-bubble flotation, and fine pulp desliming to obtain concentrate pulp , tailings slurry, and then after secondary dehydration to obtain concentrate and tailings, the specific process conditions are:

[0043] 1. The average particle size of crushed bauxite is ≤14mm;

[0044] 2. The diameter of the hydrocyclone in the second-stage grinding and grading equipment is 300mm, the concentration of overflow I is 28.35%, and the concentration of 200 mesh or more accounts for 89.97%;

[0...

Embodiment 2

[0049] The beneficiation index of embodiment 2 is shown in the following table 2.

[0050] product name al 2 o 3

SiO2 A / S Yield Raw ore 52.61 22.29 2.36 100% Concentrate 62.92 8.20 7.67 61.17% tailings 36.37 37.11 0.98 38.83%

[0051] In experiment 3, taking another coal mine in Henan as an example, the ultra-low-grade bauxite was subjected to two-stage closed-circuit crushing, two-stage closed-circuit grinding and classification, pre-selection of fine ore particles, micro-bubble flotation, and desliming of fine pulp to obtain concentrate Slurry, tailings slurry, and then after secondary dehydration to obtain concentrated ore and tailings, the specific process conditions are:

[0052] 1. The average particle size of crushed bauxite is ≤8mm;

[0053] 2. The diameter of the hydrocyclone of the second-stage grinding and grading equipment is 300mm, the concentration of overflow I is 32.49%, and the fineness of 200 mesh or mor...

Embodiment 3

[0058] The beneficiation index of embodiment 3 is shown in the following table 3.

[0059] product name al 2 o 3

SiO2 A / S Yield Raw ore 48.39 25.88 1.87 100% Concentrate 59.62 9.49 6.28 51.70% tailings 36.37 37.11 0.98 48.30%

[0060] Experiment clearly shows that the inventive method is novel and unique, scientific and reasonable, easy to operate, and has the following advantages:

[0061] (1) The ultra-low-grade bauxite that cannot be used in the original production process can be utilized, effectively alleviating the shortage of high-grade bauxite resources required for alumina production;

[0062] (2) The invention makes the total yield of ultra-low-grade bauxite beneficiation reach more than 50%, and the enrichment ratio of A / S reaches 3.3 from 2.4 in the original process;

[0063] (3) The pre-selection of fine ore particles can increase the A / S of raw ore pulp by more than 0.8, making ultra-low-grade bauxite into av...

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Abstract

The invention relates to a desiliconization method for bauxite separated concentrate producing by using ultralow-grade raw ores. The desiliconization method comprises the following steps of (1) homogenizing and crushing; (2) carrying out mineral monomer dissociation; (3) pre-separating fine ore particles; (4) carrying out micro-bubble floatation; (5) desliming separated fine ore pulp; (6) carryingout secondary dehydrating on the fine ore pulp; and (7) carrying out secondary dehydrating on tail ore pulp. The desiliconization method is novel and unique, scientific and reasonable, easy to operate, high in working efficiency and good in desiliconization effect, the silicon-aluminum ratio can be effectively improved, the productivity can be improved, the consumption of flotation reagents can be reduced, the concentrate quality can be improved, the pressure on a setting tank of tailings is relieved, the production process can be normally and continuously operated, the production cost is low, and the environmental pollution is reduced; and the method is a creative option on ore separation, and has huge economic and social benefits.

Description

technical field [0001] The invention relates to ore dressing, in particular to a desiliconization method for producing bauxite beneficiation concentrate with ultra-low-grade raw ore. Background technique [0002] my country is rich in bauxite resources, with reserves ranking fourth in the world. The ore type is mainly low-grade diaspore, accounting for about 80%. Such ores cannot be directly produced by the economical and efficient Bayer alumina process . With the development of my country's aluminum industry in the past 20 years, a large number of bauxite resources have been exploited, and the rich and poor have been mined, which is easy to discard and difficult to mine, resulting in serious waste of bauxite resources in my country, and the quality of bauxite resources has also declined significantly. Bayer process alumina The aluminum-silicon ratio of raw materials in the production process has also been reduced from above 12.0 to about 4.8 at present. The production cost c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03B7/00B03B9/00
CPCB03B7/00B03B9/00
Inventor 王秀峰万兵高朋利李民菁兰建厚李正丹李少帅张爱文范万里张孟辉冯东亚
Owner HENAN DONGDA TECH CO LTD
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