Method for preparing 4A molecular sieve from bauxite tailings

A technology of bauxite and molecular sieve, applied in the direction of crystalline aluminosilicate zeolite, A-type crystalline aluminosilicate zeolite, etc.

Inactive Publication Date: 2013-03-20
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Bauxite tailings are minerals after beneficiation in my country's Bayer aluminum smelting industry. They are rich in resources, and their low aluminum-silicon ratio and high iron make them difficult to utilize. Most of them are stored in tailings dams or red mud pools in the form of accumulation, which not only pollutes the environment, but also wastes useful resources

Method used

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  • Method for preparing 4A molecular sieve from bauxite tailings
  • Method for preparing 4A molecular sieve from bauxite tailings
  • Method for preparing 4A molecular sieve from bauxite tailings

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Embodiment 1

[0027] The raw material of the present invention is the bauxite tailings in Henan, the chemical composition of the bauxite tailings is as shown in Table 1, and the other is mainly crystal water and volatile matter, and trace elements such as Ca, S, Mg, Zr, Cr, Mn et al.

[0028]

[0029] Table 1: Chemical composition of bauxite tailings (%wt)

[0030] al 2 o 3 SiO 2 Fe 2 o 3 TiO 2 K 2 o other Bauxite tailings 51.00 26.70 13.28 3.30 3.25 2.47

[0031] Its synthetic steps are:

[0032] (1) Iron removal by acid method: take 30g of bauxite tailings less than 10μm and grind it with 500mL of 3mol / L hydrochloric acid to react at 100°C for 2 hours to remove iron. and dry.

[0033] (2) Mine-soda co-melting: Put the above-mentioned iron-removed tailings and solid NaOH in a graphite crucible to react in a muffle furnace, where the ratio of ore-soda is 1:1.5, heat to 500°C for calcination and hold for 30 minutes. The calcined product is ...

Embodiment 2

[0039] Experiment raw material is with embodiment 1

[0040] The synthesis steps are:

[0041] (1) Iron removal by acid method: take 30g of bauxite tailings less than 10μm and grind it with 500mL of 3mol / L hydrochloric acid to react at 100°C for 2 hours to remove iron. and dry.

[0042] (2) Mine-soda eutectic: Put the above-mentioned iron-removed tailings and solid NaOH in a graphite crucible to react in a muffle furnace, where the ratio of ore-soda is 1:1, heat to 500°C for calcination and hold for 60 minutes. The calcined product is ground to a fineness below 30 μm.

[0043] (3) Deployment solution: Take 8g of ore alkali eutectic product and dissolve it in 400mLH 2 O, stirred at room temperature for 1 h, filtered to separate the insoluble matter, and took the supernatant. Add 9g of sodium silicate nonahydrate to the clear liquid, fully dissolve and stir at 65°C for 2h.

[0044] (4) Crystallization reaction: the silicon-aluminum solution described in step (3) is placed i...

Embodiment 3

[0047] Experiment raw material is with embodiment 1

[0048] The synthesis steps are:

[0049] (1) Iron removal by acid method: take 30g of bauxite tailings less than 10μm and grind it with 500mL of 3mol / L hydrochloric acid to react at 100°C for 2 hours to remove iron. and dry.

[0050] (2) Mineral alkali co-melting: Put the above iron-removed tailings and solid NaOH in a graphite crucible to react in a muffle furnace, where the ratio of mineral to alkali is 1:1.5, heat to 600°C for calcination and hold for 30 minutes. The calcined product is ground to a fineness below 30 μm.

[0051] (3) Deployment solution: Take 8g of ore alkali eutectic product and dissolve it in 400mLH 2 O, stirred at room temperature for 1 h, filtered to separate the insoluble matter, and took the supernatant. Add 7g of sodium silicate nonahydrate to the clear liquid, fully dissolve and stir at 65°C for 2h.

[0052] (4) Crystallization reaction: the silicon-aluminum solution described in step (3) is ...

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Abstract

The invention belongs to the field of aluminosilicate compounds, and in particular relates to a method for preparing a 4A molecular sieve from bauxite tailings. The preparation method comprises the following steps of: (1) iron removal by using an acid process; (2) congruent melting of tailings and alkali; (3) solution preparation; (4) crystallization reaction; and (5) washing. According to the preparation method, the 4A molecular sieve which is suitable for a detergent builder is prepared by taking bauxite milltailings as a raw material, the raw material is abundant in source, and the production cost of the 4A molecular sieve is reduced; and meanwhile, the environment problems caused by low utilization rate and long-term disposal of the bauxite tailings are solved, the utilization rate and the additional value of the bauxite tailings are increased, and a new approach is opened up for comprehensive utilization of the bauxite tailings.

Description

[0001] technical field [0002] The invention belongs to the field of aluminosilicate compounds, in particular to a method for preparing 4A molecular sieves from bauxite tailings. Background technique [0003] 4A molecular sieve is an aluminosilicate compound with a cubic lattice and a uniform microporous structure. Due to the special pore structure of the molecular sieve, when the molecular sieve is in contact with the aqueous solution of the metal salt, the metal cations in the solution can enter the molecular sieve, and the cations in the molecular sieve can be exchanged and enter the solution. 4A molecular sieve replaces sodium tripolyphosphate (STPP) in industrial synthetic detergents due to its unique structure and shape, high calcium exchange capacity, strong dispersibility, and non-toxicity, thereby reducing the worldwide Severe eutrophication of water bodies reduces the environmental burden. [0004] At present, most of the 4A molecular sieves produced in the indu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/16
Inventor 张梅郭敏王振东马冬阳彭犇岳昌盛
Owner UNIV OF SCI & TECH BEIJING
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