CN-121972290-A - Separation method of gibbsite type bauxite with high silicon content

Abstract

The application relates to the technical field of bauxite screening and separation, in particular to a method for separating gibbsite type bauxite with high silicon content. The separation method comprises the steps of carrying out primary classification treatment on gibbsite type bauxite to obtain coarse-fraction raw ores and fine-fraction raw ores, carrying out photoelectric separation pretreatment on the coarse-fraction raw ores to obtain preselected concentrates and preselected tailings, crushing the preselected tailings, sequentially combining the crushed preselected tailings with the fine-fraction raw ores and carrying out secondary classification treatment to obtain coarse-fraction treated ores and fine-fraction treated ores, carrying out primary separation on the coarse-fraction treated ores to obtain coarse-fraction concentrates, carrying out secondary separation on the fine-fraction treated ores to obtain fine-fraction concentrates, combining the preselected concentrates, the coarse-fraction concentrates and the fine-fraction concentrates to obtain aluminum concentrates, and combining the coarse-fraction tailings to obtain separated tailings. The separation method can obviously improve the grade of the aluminum concentrate.

Inventors

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

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 separating gibbsite bauxite with high silicon content, the method comprising: Carrying out primary classification treatment on gibbsite type bauxite to obtain coarse-fraction raw ore and fine-fraction raw ore; Performing photoelectric separation pretreatment on the coarse fraction raw ore to obtain pre-selected concentrate and pre-selected tailings; crushing the preselected tailings to obtain a crushed material of the preselected tailings; Combining and secondarily classifying the pre-selected tailing crushed materials and the fine fraction raw ore in sequence to obtain coarse fraction treated ore and fine fraction treated ore; carrying out first separation on the coarse fraction treated ore to obtain coarse fraction concentrate; Performing second separation on the fine fraction treated ore to obtain fine fraction concentrate; And combining the pre-selected concentrate, the coarse fraction concentrate and the fine fraction concentrate to obtain aluminum concentrate.
2. 2. The separation method according to claim 1, wherein the sorting threshold of the photoelectric sorting pretreatment is 12800 to 13200.
3. 3. The separation method according to claim 1, wherein the light source intensity of the photoelectric sorting pretreatment is 50kV to 70kV.
4. 4. The separation method according to claim 1, wherein the photoelectric sorting pretreatment is fed in a vibratory manner, and the vibratory frequency of the photoelectric sorting pretreatment is 30Hz to 40Hz.
5. 5. The separation method according to claim 1, wherein the target particle diameter of the primary classification treatment is 3mm to 3.5mm, and/or The target particle diameter of the secondary classification treatment is 0.15mm to 0.20mm, and/or The grain diameter of the gibbsite type bauxite is less than or equal to 20mm.
6. 6. The separation method according to claim 1, wherein the first sorting is performed in a manner that interferes with sorting, the first sorting has a concentration of feed mineral mass of 20% to 30%, and the first sorting has a water flow rate of 15cm/s to 20cm/s.
7. 7. The separation process of claim 6 wherein the first sorted bed density is from 1.9g/cm 3 to 2.1g/cm 3 and the first sorted bed pressure differential is from 8kPa to 10kPa.
8. 8. The separation method according to claim 1, wherein the second classification is performed in a centrifugal classification manner, the rotation speed of the second classification is 300rpm to 450rpm, and the flow rate of the rinsing water of the second classification is 600L/h to 1000L/h.
9. 9. The separation method according to claim 1, wherein the gibbsite type bauxite comprises gibbsite aluminum minerals, silica minerals and iron minerals, the silica minerals comprise at least one of kaolinite, illite and pyrophyllite, and the iron minerals comprise goethite and/or hematite.
10. 10. The separation method according to claim 1, wherein the components of the gibbsite type bauxite include alumina and silica, and the mass m1 of the alumina and the mass m2 of the silica satisfy m1:m2= (2.5 to 4.0): 1.

Description

Separation method of gibbsite type bauxite with high silicon content Technical Field The application relates to the technical field of bauxite screening and separation, in particular to a method for separating gibbsite type bauxite with high silicon content. Background With the increasing lack of high-quality bauxite resources, the dependence on imported bauxite in the industry is rapidly rising. At present, bauxite is mainly diasporite, and has the remarkable characteristics of high aluminum mass content, high silicon mass content and low aluminum-silicon ratio. In addition, the medium-low grade ore of bauxite occupies higher proportion, and the processing difficulty of gibbsite type bauxite in the medium-low grade ore is high. And along with the reduction of the quality of the bauxite, the quality content of the middling ore of the bauxite is higher and higher, so that the problems of increased alkali consumption, increased red mud amount, increased cost, reduced quality of the alumina and the like in the production of the alumina are caused, and the quality improvement and the efficient utilization of bauxite resources are eagerly achieved. At present, the bauxite is generally subjected to impurity removal through a conventional flotation desilication technology, but the conventional flotation desilication technology has the problem that the grade of separated aluminum concentrate is low. Disclosure of Invention The application provides a separation method of gibbsite bauxite with high silicon content, which aims to solve the technical problem of how to improve the grade of aluminum concentrate. In a first aspect, an embodiment of the present application provides a method for separating gibbsite bauxite having a high silicon content, the method comprising: Carrying out primary classification treatment on gibbsite type bauxite to obtain coarse-fraction raw ore and fine-fraction raw ore; Performing photoelectric separation pretreatment on the coarse fraction raw ore to obtain pre-selected concentrate and pre-selected tailings; crushing the preselected tailings to obtain a crushed material of the preselected tailings; Combining and secondarily classifying the pre-selected tailing crushed materials and the fine fraction raw ore in sequence to obtain coarse fraction treated ore and fine fraction treated ore; carrying out first separation on the coarse fraction treated ore to obtain coarse fraction concentrate; Performing second separation on the fine fraction treated ore to obtain fine fraction concentrate; And combining the pre-selected concentrate, the coarse fraction concentrate and the fine fraction concentrate to obtain aluminum concentrate. Optionally, the sorting threshold of the photoelectric sorting pretreatment is 12800 to 13200. Optionally, the intensity of the light source of the photoelectric sorting pretreatment is 50kV to 70kV. Optionally, the photoelectric sorting pretreatment is fed in a vibrating manner, and the vibration frequency of the photoelectric sorting pretreatment is 30Hz to 40Hz. Optionally, the primary classification treatment has a target particle size of 3mm to 3.5mm, and/or The target particle diameter of the secondary classification treatment is 0.15mm to 0.20mm, and/or The grain diameter of the gibbsite type bauxite is less than or equal to 20mm. Optionally, the first sorting is performed in a manner that interferes with sorting, the first sorting has a feed mineral mass concentration of 20% to 30%, and the first sorting has a water flow rate of 15cm/s to 20cm/s. Optionally, the first sorted bed density is from 1.9g/cm 3 to 2.1g/cm 3 and the first sorted bed pressure differential is from 8kPa to 10kPa. Optionally, the second sorting is performed in a centrifugal sorting mode, the rotation speed of the second sorting is 300rpm to 450rpm, and the rinsing water flow rate of the second sorting is 600L/h to 1000L/h. Optionally, the gibbsite type bauxite includes gibbsite aluminum minerals, silicon minerals including at least one of kaolinite, illite, and pyrophyllite, and iron minerals including goethite and/or hematite. Alternatively, the gibbsite bauxite comprises components including alumina and silica, the mass m1 of the alumina and the mass m2 of the silica satisfying m1:m2= (2.5 to 4.0): 1. Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages: According to the method for separating the gibbsite bauxite with high silicon content, firstly, the gibbsite bauxite is separated into coarse-grain-grade raw ore and fine-grain-grade raw ore through one-time grading treatment, then the coarse-grain-grade raw ore is subjected to photoelectric sorting pretreatment, and most of waste stones which do not contain gibbsite in the coarse-grain-grade raw ore can be directly removed based on a preset sorting threshold value, so that the material grade base number entering a subsequent sorting link is improved. In addition,