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Comprehensive utilization method of high-ferrum and low-grade bauxite

A technology of low-grade bauxite and high-iron bauxite, which is applied in the field of metallurgy, can solve the problems of effective separation of difficult iron and aluminum minerals, difficulty in industrial realization, and high production cost, so as to reduce production cost, concentration, and The effect of alkalinity

Active Publication Date: 2012-07-18
GUIZHOU BRANCH CHINA ALUMINUM IND +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the iron and aluminum minerals in the iron-aluminum symbiotic ore are often inlaid together, it is difficult to effectively separate the iron and aluminum minerals by using the method of beneficiation first and then smelting; in the aluminum first iron scheme, red mud must be dealkalized before entering the blast furnace. It is difficult to realize in industry; in the plan of iron first and then aluminum, the blast furnace ironmaking needs to use expensive coke, which makes the production cost of this method high and the economic benefit poor

Method used

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  • Comprehensive utilization method of high-ferrum and low-grade bauxite

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] First the mass percentage is: Al 2 o 3 60%, Fe 2 o 3 15%, SiO 2 20%, the rest is impurity high-iron bauxite crushed to 2~5mm, and then the ore powder is ground to a particle size of -0.074mm, accounting for more than 85%. Add lime and lye to prepare raw ore pulp, wherein the amount of lime added is 35% of the mass of bauxite, and the lye is circulating sodium aluminate solution with a concentration of Na 2 O 180 g / L, α k =2.7, the solid content of raw ore pulp is 400g / L.

[0026] The raw ore slurry is subjected to Bayer method dissolution, the dissolution temperature is 300°C, and the dissolution time is 30 minutes; the dissolved slurry is subjected to solid-liquid separation, and the obtained solid is red mud. ) 3 , and finally calcined to obtain alumina.

[0027] Wash the red mud obtained after dissolution and add water to the rotating disc pelletizer to make cue balls, add water and feed continuously, make the cue balls grow up and dry to form pellets; put...

Embodiment 2

[0033] First the mass percentage is: Al 2 o 3 40%, Fe 2 o 3 40%, SiO 2 10% of the high-iron bauxite is crushed to 2-5mm, and the rest is impurity, and then the ore powder is ground to a particle size of -0.074mm, accounting for more than 85%. Add lime and lye to prepare raw ore slurry, wherein the amount of lime added is 15% of the mass of bauxite, and the lye is circulating sodium aluminate solution with a concentration of Na 2 O 260 g / L, α k =3.5, the solid content of raw ore pulp is 200g / L.

[0034] The raw ore slurry was stripped by the Bayer method, the stripping temperature was 240°C, and the stripping time was 120 minutes; the stripped slurry was subjected to solid-liquid separation, and the obtained solid was red mud, and the obtained stripping liquid was decomposed by adding aluminum hydroxide seeds to obtain Al(OH ) 3 , and finally calcined to obtain alumina.

[0035] Wash the red mud obtained after dissolution and add water to the rotating disc pelletizer...

Embodiment 3

[0041] First mass percentage is: Al 2 o 3 50%, Fe 2 o 3 27%, SiO 2 15%, the rest is impurity high-iron bauxite crushed to 2-5mm, and then the ore powder is ground to a particle size of -0.074mm, accounting for more than 85%. Add lime and lye to prepare raw ore pulp, wherein the amount of lime added is 25% of the mass of bauxite, and the lye is circulating sodium aluminate solution with a concentration of Na 2 O 220 g / L, α k =3.1, the solid content of raw ore pulp is 300g / L.

[0042] The raw ore slurry is subjected to Bayer method dissolution, the dissolution temperature is 270 ° C, and the dissolution time is 60 minutes; the dissolved slurry is subjected to solid-liquid separation, and the obtained solid is red mud. ) 3 , and finally calcined to obtain alumina.

[0043] Wash the red mud obtained after dissolution and add water to the rotating disc pelletizer to make cue balls, add water and feed continuously, make the cue balls grow up and dry to form pellets; put t...

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Abstract

A comprehensive utilization method of high-ferrum and low-grade bauxite belongs to the technical of metallurgy and is carried out according to the steps as follows: a large proportion of aluminium oxide is extracted through a Bayer process technology that excess lime is added, produced low-alkali red mud is pre-reduced through a coal-based rotary furnace process technology, then high-temperature melting separation of aluminium slag / ferrum is realized by adopting a ferrum bath oxygen coal jetting technology, formed aluminium slag generates calcium aluminate cement after being quenched and tempered, calcium aluminate cement slag is leached with low sodium carbonate solution, a part of leached crude solution and digestion slurry by the Bayer process are mixed and enter a Bayer process system to extract aluminium oxide, and the other part is desilicated and then is resolved in a carbonation manner, aluminum hydrate, which is the decomposition product, is conveyed to the Bayer process system as seed crystal, and resolved mother liquid is used for leaching calcium aluminate cement slag after being mixed. The method provided by the invention can not only ensure efficient dissociation extraction of ferrum and aluminium, but also be practicable in technology and economic benefit, thereby comprehensively utilizing high-ferrum bauxite resource of China effectively.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a comprehensive utilization method of high-iron and low-grade bauxite. Background technique [0002] my country has very rich reserves of high-iron bauxite. According to the type of bauxite deposit, it can be divided into three types: ancient weathering crust bauxite, accumulation type bauxite and laterite type bauxite. The retained resource reserves are mainly two types: accumulation type and paleo-weathering crust type, among which the monohydric accumulation type accounts for more than 80% of the retained resource reserves, and the ore has the characteristics of medium aluminum, high iron, and low sulfur. The vast majority of accumulation-type bauxite ores are composed of diaspore or gibbsite, goethite, hematite and kaolinite, accounting for more than 85%. For my country, where iron and aluminum ore resources are relatively scarce, the comprehensive utilization...

Claims

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Application Information

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IPC IPC(8): C01F7/30C01F7/02C04B7/24C22B1/02
CPCY02P40/10Y02P40/18
Inventor 于海燕武建强潘晓林刘保伟王波毕诗文顾松青
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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