Method for comprehensive utilization of high-iron bauxite

A technology for high-iron bauxite and ore grinding, which is applied in chemical instruments and methods, wet separation, silicon compounds, etc., can solve problems such as inability to desilicate bauxite, difficult monomer dissociation, and complicated relationships. To achieve the effect of comprehensive utilization and value-added processing, good application prospects and short process

Active Publication Date: 2010-11-03
CENT SOUTH UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

Due to the complex distribution of high-iron bauxite minerals, fine particle size, and difficulty in dissociation of monomers, it is impossible to effectively desilicate bauxite by pre-desilication process
At the same time, based on the imperfection of bauxite characteristics and technological conditions, various aluminum-silicon separation methods in alumina production also have deficiencies to varying degrees. Aspects of further research

Method used

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  • Method for comprehensive utilization of high-iron bauxite
  • Method for comprehensive utilization of high-iron bauxite

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Embodiment 1: High-iron bauxite is pre-crushed and ground to a fineness of -0.074mm, and the mass percentage of the particle size is 80%, and then mixed with sodium bicarbonate and sodium citrate in a mass ratio of 95:5 The compounding of additives, the dosage of additives is 17.5% of the mass percentage of dry basis of high-iron bauxite, after mixing, it is reduced and roasted at 1000°C for 90min, and the dosage of reducing agent coal is 0.7% of the dry mass. times, the roasted product is ground to a fineness of -0.074mm, and the mass percentage is 95%, and it is magnetically separated under a magnetic field strength of 97.5mT. The TFe content in the obtained magnetic product metal iron powder is 90.08%, and the Al 2 o 3 Content 1.89%, SiO 2 The content is 1.72%, and the magnetic separation recovery rate of iron is 89.23%. The TFe content of aluminum-rich slag is 5.64%, Al 2 o 3 Content 37.72%, SiO 2Content 11.62%. The aluminum-rich slag is leached with a sulfuri...

Embodiment 2

[0020] Embodiment 2: High-iron bauxite is pre-crushed and ground to a fineness of -0.074mm, and the mass percentage of the particle size is 85%, and then mixed with sodium bicarbonate and sodium citrate in a mass ratio of 92:8. The compounding of the additives, the addition amount of the additive accounts for 25% of the mass percentage of the high-iron bauxite dry basis, after mixing, it is reduced and roasted at a temperature of 1050°C for 90min, and the addition amount of the reducing agent coal is 0.9% of the mass of the dry mass. times, the roasted product is ground to a fineness of -0.074mm and the mass percentage is 95%, and magnetically separated under a magnetic field strength of 125mT, the TFe content in the obtained magnetic product metal iron powder is 92.96%, Al 2 o 3 content of 1.28%, SiO 2 The content is 1.17%, and the magnetic recovery rate of iron is 92.77%. The TFe content of aluminum-rich slag is 3.61%, Al 2 o 3 Content 40.92%, SiO 2 Content 11.65%. The...

Embodiment 3

[0021] Example 3: High-iron bauxite is pre-crushed and ground to a fineness of -0.074mm, the mass percentage of which is 95%, and is mixed with sodium bicarbonate and sodium citrate in a mass ratio of 95:5 Additives, the amount of additives accounted for 22.5% of the dry mass percentage of high-iron bauxite, after mixing, it was reduced and roasted at a temperature of 1100 ° C for 60 minutes, and the amount of reducing agent coal added was 1.2 times the dry mass. , the roasted product is ground to a fineness of -0.074mm, and the mass percentage is 98%. Magnetic separation under a magnetic field strength of 125mT, the TFe content in the obtained magnetic product metal iron powder is 92.23%, Al 2 o 3 Content 1.49%, SiO 2 The content is 1.27%, and the magnetic separation recovery rate of iron is 92.66%. TFe content of aluminum-rich slag is 4.02%, Al 2 o 3 Content 35.28%, SiO 2 Content 12.19%. The aluminum-rich slag is leached with a sulfuric acid solution with a mass percen...

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Abstract

The invention discloses a method for the comprehensive utilization of high-iron bauxite. The method comprises the following steps: uniformly mixing finely ground high iron bauxite and additives, carrying out reduction roasting by using coal as a reducing agent, and carrying out ore grinding and magnetic separation after reduction to obtain directly reduced iron powder (magnetic product) and aluminum-enriched slag (non-magnetic product); carrying out agitation leaching on the aluminum-enriched slag with leaching agent to dissolve aluminum and silicon in the solution; adsorbing the silicon in the leach solution by using porous adsorbent, and further separating the adsorbed silicon to prepare white carbon black, molecular sieves and other silicon-based products; and extracting chemical products, such as aluminum oxide, aluminum sulfate or the like, from the solution after silicon separation. When high-iron bauxite is processed by using the method, aluminum, iron and silicon can be separated, and simultaneously, valuable elements can be processed into products for different purposes so as to realize value-added processing. Besides, the method has the characteristics of short flow, low energy consumption, high comprehensive utilization rate of resources and the like, thereby having wide application prospects.

Description

technical field [0001] The invention relates to a method for comprehensive utilization of high-iron bauxite, in particular to a method for efficient utilization of high-iron gibbsite-type bauxite resources. technical background [0002] Aluminum industry and steel industry are important basic industries of my country's national economy. At present, my country has become the world's largest producer and consumer of steel and alumina. my country's iron ore and aluminum ore resources are poor in endowment, difficult to select and difficult to smelt, and the contradiction between supply and demand of resources has become increasingly prominent, which has gradually become a bottleneck restricting the development of my country's iron and steel industry and alumina industry; at the same time, due to the lack of economical and effective processing technology, resulting in Many large-scale characteristic iron ore and bauxite resources are still undeveloped and become "sluggish" minera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/20C01B33/021C22B58/00C22B34/22B03B7/00
Inventor 李光辉姜涛孙娜曾精华张元波范晓慧朱忠平李骞杨永斌郭宇峰陈许玲饶明军张吉清刘牡丹
Owner CENT SOUTH UNIV
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