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Alkaline aluminum extraction and dealkalized red mud obtaining method and dealkalized red mud obtained and application of dealkalized red mud

A technology of dealkalization red mud and alkali method, which is applied in the direction of alumina/aluminum hydroxide, silicate, magnesium silicate, etc., can solve the problems of consumption of consumable materials, large amount of solid discharge, and low added value, and achieve The effect of reducing the amount of consumable materials, reducing the amount of solid emissions, and increasing added value

Active Publication Date: 2015-05-27
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the disadvantages of the prior art that the extraction of aluminum consumes a large amount of consumable materials, the amount of solid discharge is large, and the added value is low, and to provide a method for extracting aluminum by alkali method and obtaining dealkalized red mud, as well as obtaining dealkalized red mud and its application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Aluminum-containing raw material 1: a kind of high-aluminum fly ash, the chemical composition is shown in Table 1

[0052] Table 1. Chemical composition analysis of high aluminum fly ash (weight percent)

[0053] SiO 2

[0054] Get the high aluminum fly ash that 100g table 1 forms, according to ([Na 2 O]+[K 2 O]) / ([Al 2 o 3 ]+[Fe 2 o 3 ]+[SiO 2 ])=1.0 (molar ratio), ([MgO]+[CaO]) / ([SiO 2 ]+[TiO 2 ])=1.0 (molar ratio), [MgO] / ([MgO]+[CaO])=0.93 (molar ratio), adding sodium carbonate and magnesium oxide. Mix finely with a small ball mill and pass through a 200-mesh standard sieve to prepare the raw meal. Then put it into a crucible, bake it at 850°C for 4 hours, and after cooling, grind it finely and pass it through a 200-mesh standard sieve to obtain clinker. The standard dissolution rate of alumina in roasted clinker was measured to be 98.5%. The clinker was dissolved and solid-liquid separated to obtain red mud, which was dried at 120°C for 12 hou...

Embodiment 2

[0056] Get the high aluminum fly ash that 100g table 1 forms, according to ([Na 2 O]+[K 2 O]) / ([Al 2 o 3 ]+[Fe 2 o 3 ]+[SiO 2 ])=1.1 (molar ratio), ([MgO]+[CaO]) / ([SiO 2 ]+[TiO 2 ])=0.9 (molar ratio), [MgO] / ([MgO]+[CaO])=0.50 (molar ratio), add sodium carbonate, calcium oxide, magnesium oxide. The raw meal was prepared by finely grinding and mixing with a small ball mill and passing through a 200-mesh standard sieve. Then put it into a crucible, bake it at 1050°C for 1 hour, finely grind it after cooling and pass it through a 200-mesh standard sieve to obtain clinker. The standard dissolution rate of alumina in roasted clinker was measured to be 96.3%. The clinker was dissolved and solid-liquid separated to obtain red mud, which was dried at 120°C for 12 hours, wherein the weight percentage of alkali calculated as sodium oxide was 26.37%. Add 11% by weight sodium hydroxide solution 5 times the weight of dry red mud, then dealkalize at 150°C for 2 hours, cool the slur...

Embodiment 3

[0058] Aluminum-containing raw material 2: a kind of bauxite, the chemical composition is shown in Table 2

[0059] Table 2, chemical composition analysis of bauxite (weight percent)

[0060] SiO 2

[0061] Get the bauxite that 100g table 2 forms, according to ([Na 2 O]+[K 2 O]) / ([Al 2 o 3 ]+[Fe 2 o 3 ]+[SiO 2 ])=1.05 (molar ratio), ([MgO]+[CaO]) / ([SiO 2 ]+[TiO 2 ])=0.95 (molar ratio), [MgO] / ([MgO]+[CaO])=0.33 (molar ratio), adding sodium carbonate, magnesium oxide and calcium oxide. The raw meal was prepared by finely grinding and mixing with a small ball mill and passing through a 200-mesh standard sieve. Then put it into a crucible, bake it at 980°C for 2 hours, and after cooling, grind it finely and pass it through a 200-mesh standard sieve to obtain clinker. The standard dissolution rate of alumina in roasted clinker was measured to be 97.9%. The clinker was dissolved and solid-liquid separated to obtain red mud, which was dried at 120°C for 12 hour...

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Abstract

The invention discloses an alkaline aluminum extraction and dealkalized red mud obtaining method, which comprises the following steps: (1) raw materials including an aluminiferous raw material, a sodium oxide precursor, a magnesium oxide precursor and an optional calcium oxide precursor are prepared according to a raw material formula; (2) the raw materials are roasted at 800-1300 DEG C to obtain a sintered clinker; (3) the sintered clinker undergoes dissolution and solid-liquid separation to obtain red mud and a digested liquor; (4) the digested liquor undergoes desilicication and carbonating disintergration so as to obtain aluminium hydroxide; and (5) the red mud is dealkalized to obtain the dealkalized red mud containing magnesium silicate, wherein the raw material formula satisfies that molar ratio of the components oxides ([MgO]+[CaO]) / ([SiO2]+[TiO2]) is 0.9-1.1. The invention also discloses dealkalized red mud obtained by the above method and an application of the dealkalized red mud. By the method provided by the invention, high standard dissolution rate of aluminium oxide can be maintained, and added value of aluminum extraction is high.

Description

technical field [0001] The invention relates to a method for obtaining dealkalized red mud in the process of extracting aluminum by an alkali method, and the dealkalized red mud obtained by the method and an application thereof. Background technique [0002] Alkaline production of alumina has a long history and is mainly divided into Bayer method, sintering method and their combined methods. [0003] The sodium carbonate sintering method was first proposed in 1858. Due to the large alkali consumption, poor quality of alumina, complicated process and high heat consumption, it was eliminated after the Bayer process appeared in 1889. After 1880, it was found that limestone and sodium carbonate were used to burn aluminum-containing raw materials in a certain proportion, which could reduce alkali consumption and increase the extraction rate of alumina. After further development, the traditional soda lime sintering method was formed. Soda lime sintering method is superior to Baye...

Claims

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Application Information

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IPC IPC(8): C01F7/02C01B33/22
CPCC01B33/22C01F7/02
Inventor 赵利军孙琦王宝冬禹耕之刘晓婷肖永丰王晓欢
Owner CHNA ENERGY INVESTMENT CORP LTD
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