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Method for comprehensively utilizing low-grade bauxite

A low-grade bauxite and aluminum liquid technology, applied in chemical instruments and methods, aluminum compounds, alkali metal compounds, etc., can solve problems that hinder the normal operation of the production process, avoid hazards, high energy consumption, and overcome the amount of calcium high effect

Inactive Publication Date: 2019-01-25
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, after recent years of industrial practice, the increasingly exposed problems of the Bayer process have seriously hindered the normal operation of the production process and become a bottleneck for its continued promotion and development.

Method used

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  • Method for comprehensively utilizing low-grade bauxite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] In this embodiment, middle and low-grade bauxite is used, and its aluminum-silicon ratio is 3.5, and its main chemical composition (mass percentage, wt%) is:

[0044]Alumina (Al 2 o 3 ): 60.60%

[0045] Silicon dioxide (SiO 2 ): 17.5%

[0046] Iron oxide (Fe 2 o 3 ): 9.8%,

[0047] Titanium dioxide (TiO 2 ): 0.89%

[0048] Others are impurities;

[0049] Lime and carbon soda are common industrial grade products;

[0050] x N = 0.5;

[0051] x C = 1.0.

[0052] according to this figure 1 A kind of method for the comprehensive utilization of low-grade bauxite of the present invention shown, comprises the following steps:

[0053] S1: Mix bauxite, lime, carbon soda and circulating mother liquor, and then mix them uniformly in a ball mill to obtain a slurry;

[0054] In this step, in the mixing of the ingredients, a ball mill is used for mixing to obtain a uniform mixed slurry, which is convenient for the processing in the subsequent steps and improves the p...

Embodiment 2

[0071] In this embodiment, middle and low-grade bauxite is used, and its aluminum-silicon ratio is 2.44, and its main chemical composition (mass percentage, wt%) is:

[0072] Alumina (Al 2 o 3 ): 55.22%

[0073] Silicon dioxide (SiO 2 ): 22.66%

[0074] Iron oxide (Fe 2 o 3 ): 7.82%,

[0075] Titanium dioxide (TiO 2 ): 0.63%

[0076] Others are impurities;

[0077] Lime and caustic are common industrial grade products;

[0078] x N = 1.0;

[0079] x C = 1.0.

[0080] according to this figure 1 A kind of method for the comprehensive utilization of low-grade bauxite of the present invention shown, comprises the following steps:

[0081] S1: Mix bauxite, lime, carbon soda and circulating mother liquor, and then mix them uniformly in a ball mill to obtain a slurry;

[0082] In this step, in the mixing of the ingredients, a ball mill is used for mixing to obtain a uniform mixed slurry, which is convenient for the processing in the subsequent steps and improves the p...

Embodiment 3

[0099] In this embodiment, middle and low-grade bauxite is used, and its aluminum-silicon ratio is 4.43, and its main chemical composition (mass percentage, wt%) is:

[0100] Alumina (Al 2 o 3 ): 60.71%

[0101] Silicon dioxide (SiO 2 ): 13.71%

[0102] Iron oxide (Fe 2 o 3 ): 6.31%,

[0103] Titanium dioxide (TiO 2 ): 1.12%

[0104] Others are impurities;

[0105] Lime and caustic are common industrial grade products;

[0106] x N = 1.0;

[0107] x C = 1.5.

[0108] according to this figure 1 A kind of method for the comprehensive utilization of low-grade bauxite of the present invention shown, comprises the following steps:

[0109] S1: Mix bauxite, lime, carbon soda and circulating mother liquor, and then mix them uniformly in a ball mill to obtain a slurry;

[0110] In this step, in the mixing of the ingredients, a ball mill is used for mixing to obtain a uniform mixed slurry, which is convenient for the processing in the subsequent steps and improves the p...

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Abstract

The invention relates to a method for comprehensively utilizing low-grade bauxite. The method comprises the following steps: S1: mixing the low-grade bauxite, lime, alkali and a circulating mother solution and compounding to obtain slurry; S2: drying the slurry outside a kiln to obtain dried raw materials; then sintering the dried raw materials to obtain sintered clinker; S3: carrying out leachingsolution on the sintered clinker and carrying out solid-liquid separation to obtain leached dreg and a leaching solution; S4: carrying out aluminum oxide extraction treatment on the leaching solutionto obtain an aluminum oxide product and an aluminum extracting solution; S5: blending the aluminum extracting solution in step S4 to prepare the circulating mother solution used in step S1; returningthe circulating mother solution back to step S1 to be mixed; S6: adding a dealkalization solution into the leached dreg in step S3 and carrying out alkali recycling treatment; carrying out solid-liquid separation to obtain calcium silicate powder and alkali liquid, wherein the alkali liquid is used for preparing a NaOH product and is returned back to an alkali recycling treatment process. By adopting the method provided by the invention, the extraction of aluminum oxide in the bauxite is realized; meanwhile, a high-addition-value product containing the aluminum oxide and a calcium silicate powder material are prepared and comprehensive utilization of a low-grade bauxite resource is realized.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of red mud, in particular to a method for comprehensive utilization of low-grade bauxite, in particular to a method for preparing magnetic iron or metallic iron by carbothermal reduction of andandrite type red mud slag. Background technique [0002] my country's bauxite resources are relatively rich, but most of them are medium and low-grade bauxite, which has the characteristics of high aluminum, high silicon, and low aluminum-silicon ratio (A / S). In addition, there are some aluminum-containing resources in my country, such as fly ash etc. With the decrease of ore grade, the cost of each alumina production process is gradually increasing, among which the Bayer process has the largest increase. According to the basic process and principle of the Bayer process, when the A / S of bauxite drops below 5, it will be difficult to process it with the Bayer process. For low-grade bauxite,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/06C01D7/00C01B33/24
CPCC01F7/0613C01B33/24C01D7/00C01F7/06C01F7/062
Inventor 于海燕潘晓林吴艳毕诗文
Owner NORTHEASTERN UNIV
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