Processing process for producing brown fused alumina from bauxite powder ore with reduced grade

A bauxite powder and grade reduction technology, which is applied in alumina preparation, aluminate/alumina/aluminum hydroxide purification and other directions, can solve the problems of increased smelting energy consumption, unfavorable raw material selection, and high smelting temperature, and achieves The effect of small temperature difference between inside and outside, shortening smelting time and lowering smelting temperature

Pending Publication Date: 2019-11-12
GUIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the smelting process of brown corundum, natural high-quality massive bauxite is used, which enters the smelting process after being calcined and dehydrated. The relatively dense lump ore has a large temperature difference between the inside and outside of the smelting process, and the required smelting temperature is higher and the time is longer. Increase the energy consumption of smelting
However, during the mining process of ore, it is often accompanied by more powdery bauxite. Due to the poor air permeability of this part of the powder ore, it is easy to block the furnace, produce too much dust and ash, and pollute the environment. Currently, the powder ore is not used as a smelting raw material, which is not conducive to raw material selection

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1: A processing technology for producing brown corundum from bauxite powder with reduced grade, including the following steps:

[0027] 1) Grind and mix the powdered bauxite, the particle size of the mineral powder is 37μm-2000μm;

[0028] 2) Add water to the mineral powder until it can be shaped, and then press it into a block to obtain product A;

[0029] 3) Preheat product A in an environment of 50°C, and then put it in an environment of 900°C for dehydration for 1.5 hours to obtain product B;

[0030] 4) Cool product B naturally to 150°C to obtain product C;

[0031] 5) Spray lye on product C for desilication (the concentration of caustic solution is 80g / L), and get product D. After ore desilication, its grade is increased from 68.2% to 88.3%, and A / S is increased from 7.2 to 14.6 , The lye after spraying is collected and recycled;

[0032] 6) The product D is calcined and dehydrated again at 900°C for 1.5 hours and then subjected to conventional smelting to obtain br...

Embodiment 2

[0033] Embodiment 2: A processing technology for producing brown corundum from bauxite powder with reduced grade, including the following steps:

[0034] 1) Grind and mix the powdered bauxite, the particle size of the mineral powder is 37μm-2000μm;

[0035] 2) Add water to the mineral powder until it can be shaped, and then press it into a block to obtain product A;

[0036] 3) Preheat product A in an environment of 100°C, and then put it in an environment of 1080°C for dehydration for 0.8h to obtain product B;

[0037] 4) Cool product B naturally to 180℃ to obtain product C;

[0038] 5) Spray lye on product C for desiliconization (the concentration of caustic solution is 90g / L), and product D is obtained. After the ore is desiliconized, its grade is increased from 68.2% to 86.1%, and A / S is increased from 7.2 to 13.2 , The lye after spraying is collected and recycled;

[0039] 6) The product D is calcined and dehydrated again at 1000°C for 1.2h and then subjected to conventional smelti...

Embodiment 3

[0040] Embodiment 3: A process for producing brown corundum from bauxite powder ore with reduced grade, including the following steps:

[0041] 1) Grind and mix the powdered bauxite, the particle size of the mineral powder is 37μm-2000μm;

[0042] 2) Add water to the mineral powder until it can be shaped, and then press it into a block to obtain product A;

[0043] 3) Preheat product A in an environment of 200°C, and then put it in an environment of 1100°C for dehydration for 1.0h to obtain product B;

[0044] 4) Cool product B naturally to 220℃ to obtain product C;

[0045] 5) Spray lye on product C for desiliconization (the concentration of caustic solution is 100g / L), and product D is obtained. After the ore is desiliconized, its grade is increased from 70.1% to 87.4%, and A / S is increased from 7.5 to 15.3 , The lye after spraying is collected and recycled;

[0046] 6) The product D is calcined and dehydrated again at 1050°C for 1h and then subjected to conventional smelting to obtai...

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Abstract

The invention discloses a processing process for producing brown fused alumina from bauxite powder ore with reduced grade. The processing process comprises: 1) grinding powdery bauxite with low grade,and uniformly mixing to obtain ore powder; 2) adding water to the ore powder until the material can be molded, and pressing into a block to obtain a product A; 3) pre-heat the product A in a 50-500 DEG C environment, placing in a 900-1150 DEG C environment, and dewatering for 0.5-1.5 h to obtain a product B; 4) cooling the product B to a temperature of 150-250 DEG C to obtain a product C; 5) spraying the product C with an alkali liquid, and carrying out desiliconization to obtain a product D; and 6) dewatering the product D again, and carrying out conventional smelting to obtain the brown fused alumina. According to the present invention, the processing process has characteristics of quick desiliconization, good effect, low smelting temperature, short time, low energy consumption and environmental protection, and can easily widen the selection range of bauxite raw materials, improve the quality of brown fused alumina and reduce the production cost.

Description

Technical field [0001] The invention relates to a processing technology of brown fused alumina, in particular to a processing technology of using low-grade bauxite powder to produce brown fused alumina. Background technique [0002] Brown corundum, also known as emery, is a kind of artificial corundum. The main chemical composition of brown corundum is Al 2 O 3 , Its content is 95.00%-97.00%, and also contains a small amount of Fe, Si, Ti, etc. Brown corundum is the most basic abrasive. Because of its good grinding performance, wide application range and low price, it is widely used. [0003] The existing brown corundum production is made by melting and reducing the three raw materials of bauxite, carbon material and iron filings in an electric arc furnace. Bauxite is the main raw material, and its quality requirements are very strict in production. 2 O 3 Grade not less than 80%, SiO 2 The content of bauxite does not exceed 6%. At present, the reserves of high-quality bauxite in m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/38C01F7/46
CPCC01F7/38C01F7/46
Inventor 陈朝轶兰苑培李军旗王林珠金会心毛小浩龙乾王干干
Owner GUIZHOU UNIV
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