CN-121972291-A - Desulfurization and decarbonization method for high-sulfur high-carbon bauxite

Abstract

The application provides a desulfurization and decarbonization method for high-sulfur high-carbon bauxite, belonging to the field of bauxite beneficiation. The method comprises the steps of crushing and screening high-sulfur high-carbon bauxite to obtain a crushed product with a set granularity, carrying out first screening on the crushed product to obtain coarse fraction ore and undersize product, carrying out second screening on the undersize product to obtain middle fraction ore and fine fraction ore, carrying out first reselection on the coarse fraction ore to obtain first aluminum concentrate and first tailings, carrying out second reselection on the middle fraction ore to obtain second aluminum concentrate and second tailings, merging the first aluminum concentrate, the second aluminum concentrate and the fine fraction ore to grind to obtain magnetic separation feed, carrying out magnetic separation on the magnetic separation feed to obtain magnetic separation aluminum concentrate and magnetic separation tailings, and carrying out closed-circuit flotation on the magnetic separation aluminum concentrate to obtain aluminum concentrate and sulfur concentrate. The desulfurization and decarbonization effects of the high-sulfur and high-carbon bauxite are improved by adopting a grading-decarbonization-desulfurization mode.

Inventors

• GUO XIN
• ZHANG NAN
• LU SHIKE
• CHEN YOUXUAN
• ZHANG JIANQIANG
• Du wuxing
• CUI YANFANG
• WEI ZHAOBIN
• XU KE
• MA JUNWEI
• ZHANG ZHANYUN

Assignees

• 中铝郑州有色金属研究院有限公司

Dates

Publication Date

20260505

Application Date

20260403

Claims (10)

1. 1. A method for desulfurizing and decarbonizing high sulfur high carbon bauxite, said method comprising: Crushing and screening high-sulfur high-carbon bauxite to obtain a crushed product with set granularity; Carrying out first screening on the crushed product to obtain coarse fraction ore and undersize products; Carrying out second screening on the undersize products to obtain medium-size fraction ores and fine-size fraction ores; performing first reselection on the coarse fraction ore to obtain first aluminum concentrate and first tailings; performing second reselection on the medium-sized ore to obtain second aluminum concentrate and second tailings; combining the first aluminum concentrate, the second aluminum concentrate and the fine fraction ore for grinding to obtain a magnetic separation feeding material; magnetically separating the magnetic separation feed to obtain magnetic separation aluminum concentrate and magnetic separation tailings, and And carrying out closed flotation on the magnetic separation aluminum concentrate to obtain aluminum concentrate and sulfur concentrate.
2. 2. The method according to claim 1, wherein the sulfur content of the high sulfur high carbon bauxite is 1% -15% and the carbon content is 1% -5% by mass.
3. 3. The method according to claim 1, wherein the crushed product has a set particle size of-2 mm to-10 mm.
4. 4. The method of claim 1, wherein the first screen has a particle size threshold of 0.15mm to 2mm, and/or, The granularity threshold value of the second screening is 0.074 mm-0.5 mm.
5. 5. The method of claim 1, wherein the first reselection equipment is a heavy medium cyclone, the density of the heavy medium cyclone is 1.5g/cm 3 ～2.1g/cm 3 , the feeding pressure of the heavy medium cyclone is 0.08 mpa-0.14 mpa, and/or, The second reselection equipment is an interference bed separator, and the rising water flow speed of the interference bed separator is 0.25 m/s-0.35 m/s.
6. 6. The method of claim 1, wherein the magnetic separation feed has a particle size of-0.074 mm at a ratio of 85% -95%.
7. 7. The method according to claim 1, wherein the magnetic separation has a magnetic field strength of 0.7T-1.5T, and/or, The pH value of the closed circuit flotation is 8-10.
8. 8. The method of claim 1, wherein the flotation desulphurised collector is a hydrophobic nanoparticle collector having a structural formula as shown in formula 1: wherein M is a functional monomer of the nanoparticle collector, and the structural formula of M is shown as M1, M2 and M3: 。
9. 9. The method of claim 8, wherein the contact angle of the hydrophobic nanoparticle collector is 75 ° -105 °, and the particle size of the hydrophobic nanoparticle collector is 65 nm-125 nm.
10. 10. The method according to claim 1, characterized in that the carbon content of the aluminium concentrate is <0.3%, the sulphur content of the aluminium concentrate is <0.3%, and the sulphur content of the sulphur concentrate is >40% in mass fraction.

Description

Desulfurization and decarbonization method for high-sulfur high-carbon bauxite Technical Field The application relates to the technical field of bauxite beneficiation, in particular to a desulfurization and decarbonization method for high-sulfur high-carbon bauxite. Background In recent years, with the increasing depletion of domestic high-quality bauxite resources, complex and difficult-to-select high-sulfur high-carbon bauxite resources are developed, so that the strategic safety of the bauxite resources in China is guaranteed, and the sustainable development of the alumina industry is enabled. The sulfur in bauxite exists in different valence states such as S 22-、S2-、SO32-、SO42- in the dissolution process of alumina produced by the Bayer process, and the ions seriously affect the effect of dissolution process, accelerate corrosion of production equipment, damage equipment safety, cause dissolution liquid pollution, reduce product quality, increase alkali consumption by reacting with alkali in solution, be unfavorable for seed precipitation, reduce red mud settling capacity and the like. (2) The high carbon content in bauxite can cause the problems of high carbon-base ratio, influence on the dissolution productivity, the dissolution energy consumption increase, the reduction of the seed precipitation rate, influence on the granularity and the quality of alumina products and the like in the production of alumina. Chinese patent CN118321016a discloses an industrial production method for comprehensive utilization of high-sulfur high-carbon complex bauxite, wherein the comprehensive utilization method is to crush, grind and pulp mixing the high-sulfur high-carbon bauxite to obtain ore pulp, then to perform flotation process flow of roughing, concentrating and scavenging on the ore pulp by adopting a flotation reagent, and to separate and enrich sulfide and aluminum minerals by flotation, thereby obtaining sulfur concentrate and aluminum concentrate. By adopting the comprehensive utilization method, the high-grade aluminum concentrate and sulfur concentrate products can be obtained through the flotation process flow of 'second coarse, second fine and third sweeping', under the condition of not increasing the desulfurization procedure, the obtained sulfur concentrate has high purity, the obtained aluminum concentrate can be directly used for producing alumina by a Bayer process, the comprehensive utilization method is suitable for comprehensively utilizing high-sulfur high-carbon complex bauxite with the sulfur content of 3-14% and the carbon content of 0.8-2%, and the large-scale industrial production is realized. Chinese patent CN116213108a discloses a method for decarbonizing and deironing high sulfur bauxite, which comprises crushing high sulfur bauxite, sieving with preset granularity to obtain fine-grain high sulfur bauxite, wet coarse grinding the fine-grain high sulfur bauxite to obtain coarse grinding pulp, adjusting the ph of the coarse grinding pulp, adding a flotation reagent into the coarse grinding pulp to obtain desulphurized aluminum concentrate, fine grinding the desulphurized aluminum concentrate, carrying out strong magnetic separation to obtain low-carbon low-iron aluminum concentrate and high-carbon high-iron tailings, wherein the flotation reagent comprises inhibitor, activator, composite desulphurized collector and foaming agent, the preset granularity is 6 mm-9 mm, and grinding the ore in stagesThe floating magnetic combined stage separation technology has the characteristics of low energy consumption, low production cost, high recovery rate, strong process adaptability, stable production, high comprehensive utilization rate and the like. Chinese patent CN118807961a discloses a desulfurization method of high sulfur bauxite, which includes the steps of grinding deposited high sulfur bauxite for the first time to obtain a first mineral aggregate, performing open-circuit flotation desulfurization on the first mineral aggregate to obtain a first aluminum concentrate, a first sulfur concentrate and middlings, performing dispersion slurry mixing on the middlings, performing secondary grinding to obtain a second mineral aggregate, and performing closed-circuit flotation desulfurization on the second mineral aggregate to obtain a second aluminum concentrate and a second sulfur concentrate. The sulfur content of the first aluminum concentrate and the second aluminum concentrate obtained by the method can be as low as below 0.5%, the first aluminum concentrate and the second aluminum concentrate can be used as raw materials for producing aluminum oxide, and the obtained first sulfur concentrate and second sulfur concentrate can be used as raw materials for producing sulfuric acid. Chinese patent CN114918046B discloses a desulfurization method of high sulfur bauxite, which belongs to the technical field of high sulfur bauxite desulfurization. The method comprises the steps of obtaining high-sulfur