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CN-121972289-A - Comprehensive utilization method of high-carbonate bauxite

CN121972289ACN 121972289 ACN121972289 ACN 121972289ACN-121972289-A

Abstract

The application relates to the technical field of quality improvement and impurity removal of colored resources, in particular to a method for comprehensively utilizing high-carbonate bauxite. The high-carbonate bauxite comprises aluminum minerals, iron minerals and inorganic carbon-containing minerals, and the method comprises the steps of crushing the high-carbonate bauxite at one stage to obtain bauxite powder, screening and classifying the bauxite powder at one stage to obtain coarse-grain materials, medium-grain materials and fine-grain materials, crushing the coarse-grain materials at two stages to obtain coarse-grain ore powder, returning the coarse-grain ore powder to the first screening and classifying stage for cyclic treatment, carrying out sectional reselection on a heavy medium group and the medium-grain materials to obtain second aluminum concentrate, screening and classifying the fine-grain materials at two stages to obtain oversize materials and undersize materials, carrying out multistage grinding and multistage magnetic separation on the oversize materials, the undersize materials and the second aluminum concentrate to obtain aluminum concentrate products and iron-containing tailings. The method synchronously achieves the aims of high inorganic carbon removal rate and high aluminum concentrate product yield through the closed-loop physical flow of crushing, grading, gravity separation, grinding and magnetic separation.

Inventors

  • ZHANG JIANQIANG
  • ZHANG ZHENGQUAN
  • YU SHICHAO
  • WEI ZHAOBIN
  • ZHANG NAN
  • ZHANG MENG
  • LU SHIKE
  • LU YUHANG
  • Du wuxing
  • GUO XIN
  • ZHANG ZHIYONG
  • ZHANG LE
  • XU KE
  • LIU ZHONGYUAN
  • MA JUNWEI
  • CUI YANFANG

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 the comprehensive utilization of high carbonate bauxite, wherein the high carbonate bauxite comprises aluminum minerals, iron minerals and inorganic carbon-containing minerals, the method comprising: carrying out primary crushing on the high-carbonate bauxite to obtain bauxite powder; Carrying out one-stage screening classification on the bauxite powder to obtain coarse-grain materials, medium-grain materials and fine-grain materials; Carrying out secondary crushing on the coarse-grain-level material to obtain coarse-grain-level mineral powder; Returning the coarse-grain mineral powder to the first-stage screening classification for cyclic treatment; Carrying out sectional reselection on the heavy medium group and the medium materials to separate aluminum minerals, iron minerals and inorganic carbon-containing minerals in the medium materials so as to obtain second aluminum concentrate; carrying out two-stage screening classification on the fine-grained materials to obtain oversize materials and undersize materials; And carrying out multistage grinding and multistage magnetic separation on the oversize material, the undersize material and the second aluminum concentrate to obtain aluminum concentrate and iron-containing tailings.
  2. 2. The method of claim 1, wherein the step of subjecting the dense media pack and the medium-sized material to a staged reselection to separate aluminum minerals, iron minerals and inorganic carbon-containing minerals from the medium-sized material to obtain a first iron tailings and a second aluminum concentrate comprises the steps of: Performing one-stage reselection on the first heavy medium and the medium-sized material to separate aluminum minerals, iron minerals and inorganic carbon-containing minerals in the medium-sized material to obtain first aluminum concentrate; and performing secondary gravity separation on the second gravity medium and the first aluminum concentrate to separate aluminum minerals and iron minerals in the first aluminum concentrate, so as to obtain first iron tailings and second aluminum concentrate.
  3. 3. The method of claim 2, wherein the first heavy medium has a specific gravity of 1.6g/cm 3 to 2.0g/cm 3 and the one-stage reselection feed frequency is 24Hz to 28Hz.
  4. 4. The method of claim 2, wherein the second gravity medium has a specific gravity of 2.2g/cm 3 to 2.5g/cm 3 and the two-stage reselection is fed at a frequency of 30Hz to 36Hz.
  5. 5. The method of claim 2, wherein the oversize material, the undersize material, and the second aluminum concentrate are subjected to multi-stage grinding and multi-stage magnetic separation to obtain an aluminum concentrate product and an iron-containing tailings, comprising the steps of: combining the oversize material and the second aluminum concentrate to obtain a first mixed material; Carrying out primary grinding on the first mixed material to obtain primary magnetic separation feeding material; combining the first-stage magnetic separation feeding material and the undersize material to obtain a second mixed material; carrying out one-stage magnetic separation on the second mixed material to obtain third aluminum concentrate and second iron tailings; carrying out secondary grinding on the third aluminum concentrate to obtain a secondary magnetic separation feeding material; carrying out second-stage magnetic separation on the second-stage magnetic separation feeding material to obtain an aluminum concentrate product and third iron tailings; and combining the first iron tailings, the second iron tailings and the third iron tailings to obtain iron-containing tailings.
  6. 6. The method according to claim 5, wherein the one-stage magnetic separation feed comprises one-stage fine fraction magnetic separation feed having a mass of 70% to 80% of the mass of the one-stage magnetic separation feed, the one-stage fine fraction magnetic separation feed having a particle size of 0.074mm or less, and/or The secondary magnetic separation feeding comprises a secondary fine fraction magnetic separation feeding, the mass of the secondary fine fraction magnetic separation feeding is 81-90% of the mass of the secondary magnetic separation feeding, and the particle size of the secondary fine fraction magnetic separation feeding is less than or equal to 0.074mm.
  7. 7. The method according to claim 5, wherein the magnetic field strength of the one-stage magnetic separation is 0.4T to 0.6T, the one-stage magnetic separation is performed in the form of pulsating water, the pulsating water pulse frequency of the one-stage magnetic separation is 20Hz to 25Hz, and/or The magnetic field intensity of the two-stage magnetic separation is 0.7T to 0.9T, the two-stage magnetic separation is performed in the form of pulsating water, and the pulsating water pulse frequency of the two-stage magnetic separation is 18Hz to 22Hz.
  8. 8. The method of claim 5, wherein the first magnetic separation and the second magnetic separation both use cylindrical steel bars and diamond-shaped steel bars as the composite magnetic focusing medium, wherein the filling rate of the composite magnetic focusing medium of the first magnetic separation is 14 to 17%, and the filling rate of the composite magnetic focusing medium of the second magnetic separation is 18 to 23%.
  9. 9. The method according to claim 8, wherein in the one-stage magnetic separation composite magnetic focusing medium, the number S1 of the cylindrical steel bars and the number S2 of the diamond-shaped steel bars satisfy S1:S2= (1 to 3): 1, and/or In the composite magnetism collecting medium for the two-stage magnetic separation, the number S1 of the cylindrical steel bars and the number S2 of the diamond steel bars meet the following conditions that S1: S2=1 (2 to 3).
  10. 10. The method of claim 1, wherein the target particle size of the one stage sieve classification comprises a first particle size of 4mm to 7mm and a second particle size of 0.1mm to 0.5mm, and/or The target particle size of the two-stage screening classification is 0.038mm to 0.074mm.

Description

Comprehensive utilization method of high-carbonate bauxite Technical Field The application relates to the technical field of quality improvement and impurity removal of colored resources, in particular to a method for comprehensively utilizing high-carbonate bauxite. Background With the rapid development of the aluminum industry, the shortage of high-quality bauxite resources has led to a dramatic increase in the dependence of the aluminum industry on imported bauxite resources. However, the existing bauxite resources under coal are rich in reserves, and have huge economic value and important strategic value. If the imported bauxite resource can be replaced by the undermining bauxite, the high-efficiency utilization of the complex bauxite resource can be realized. However, the content of carbon impurity minerals of high-carbon acids in the prior coal-derived bauxite is high, and the high-carbon impurities are difficult to be efficiently utilized, so that the development and utilization of the coal-derived high-carbon bauxite resources are still in an exploration stage, the large-scale production is not realized, and the supporting effect on the aluminum industry is not achieved. The prior process for treating high carbonate in bauxite resources under coal mainly comprises (1) a method for simultaneously removing carbon and sulfur from high-sulfur high-carbon bauxite. The method comprises the steps of crushing raw bauxite with high sulfur and high carbon to obtain a crushed product, adding the crushed product into a ball mill to perform ore grinding treatment to obtain ore pulp, conveying the ore pulp to a flotation tank to perform flotation, adding a pH regulator sulfuric acid into the ore pulp to regulate the pH of the ore pulp to be in a range of 4 to 7, adding an inhibitor (generally phosphoric acid or a phosphoric acid derivative) into the ore pulp, sequentially adding a hydrocarbon oil collector, a xanthate collector and a fatty acid anion collector into the prepared ore pulp to perform flotation operation to obtain the desulfurated decarbonized bauxite, and (2) comprehensively utilizing the industrial production method of the high sulfur and high carbon complex bauxite. The process of the comprehensive utilization industrial production method comprises the steps of crushing, grinding and pulp mixing high-sulfur high-carbon bauxite in sequence to obtain ore pulp, and then adopting a flotation reagent to carry out a flotation process flow (comprising roughing, concentration and scavenging) on the ore pulp, and separating and enriching sulfide and aluminum minerals in the ore pulp through flotation, so as to obtain sulfur concentrate and aluminum concentrate. However, these treatments have low removal rates of inorganic carbon from the bauxite under the coal and low yields of aluminum concentrate, which are difficult to meet the requirements of efficient utilization. Disclosure of Invention The application provides a method for comprehensively utilizing high-carbonate bauxite, which aims to solve the technical problem of synchronously improving the removal rate of inorganic carbon in bauxite resources under coal and the yield of aluminum concentrate. In a first aspect, embodiments of the present application provide a method for comprehensive utilization of high carbonate bauxite including aluminum minerals, iron minerals, and inorganic carbon-containing minerals, the method comprising: carrying out primary crushing on the high-carbonate bauxite to obtain bauxite powder; Carrying out one-stage screening classification on the bauxite powder to obtain coarse-grain materials, medium-grain materials and fine-grain materials; Carrying out secondary crushing on the coarse-grain-level material to obtain coarse-grain-level mineral powder; Returning the coarse-grain mineral powder to the first-stage screening classification for cyclic treatment; Carrying out sectional reselection on the heavy medium group and the medium materials to separate aluminum minerals, iron minerals and inorganic carbon-containing minerals in the medium materials so as to obtain second aluminum concentrate; carrying out two-stage screening classification on the fine-grained materials to obtain oversize materials and undersize materials; And carrying out multistage grinding and multistage magnetic separation on the oversize material, the undersize material and the second aluminum concentrate to obtain an aluminum concentrate product and iron-containing tailings. Optionally, the heavy medium group and the medium material are subjected to sectional reselection to separate aluminum minerals, iron minerals and inorganic carbon-containing minerals in the medium material, so as to obtain first iron tailings and second aluminum concentrate, which comprises the following steps: Performing one-stage reselection on the first heavy medium and the medium-sized material to separate aluminum minerals, iron minerals and inorganic carbon-containing mineral