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Hydrothermal synthesis method of 4A molecular sieve from high-iron bauxite tailings

A high-iron bauxite and molecular sieve technology, applied in the direction of crystalline aluminosilicate zeolite, A-type crystalline aluminosilicate zeolite, etc., can solve the problems of difficult utilization, environmental pollution, waste, etc., and achieve improved production efficiency, improved performance, Effect of reducing Fe2O3 content

Inactive Publication Date: 2014-10-22
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Bauxite tailings are minerals after beneficiation in my country's Bayer aluminum smelting industry. They are rich in resources. Their low aluminum-silicon ratio and high iron make them difficult to use. Most of them are stored in tailings dams or red mud in the form of accumulation. In the warehouse, it not only pollutes the environment, but also wastes useful resources

Method used

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  • Hydrothermal synthesis method of 4A molecular sieve from high-iron bauxite tailings
  • Hydrothermal synthesis method of 4A molecular sieve from high-iron bauxite tailings
  • Hydrothermal synthesis method of 4A molecular sieve from high-iron bauxite tailings

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Embodiment 1

[0026] The raw material of the present invention is Yuzhong bauxite tailings. The chemical composition of the bauxite tailings is shown in Table 1. The other main components are Al 2 O 3 , SiO 2 , Fe 2 O 3 , TiO 2 , K 2 O, the rest is crystal water, volatile matter and trace other impurities, such as Ca, S, Mg, Zr, Cr, Mn, etc.

[0027] Table 1: Main chemical composition table of bauxite tailings (%wt)

[0028]

[0029] The synthesis steps are:

[0030] (1) Ore-alkali eutectic: Take a certain amount of the above-mentioned tailings and solid NaOH, mix them and place them in a graphite crucible, and react in a muffle furnace. The ratio of ore to alkali is 1:0.75, heated to 400℃ for calcination and heat preservation 90min. The calcined product is ground to less than 30 μm.

[0031] (2) Preparation into glue: take 5g of mineral-alkali eutectic product and dissolve in 50mLH 2 In O, stir for 15 min at room temperature, filter to separate insolubles, and take the supernatant. Add 5g of sod...

Embodiment 2

[0036] The experimental raw materials are the same as in Example 1

[0037] The synthesis steps are:

[0038] (1) Ore-alkali eutectic: Take a certain amount of the above tailings and solid NaOH, mix them and place them in a graphite crucible, and react in a muffle furnace. The ratio of ore to alkali is 1:1, heated to 500℃ for calcination and heat preservation 60min. The calcined product is ground to less than 30 μm.

[0039] (2) Preparation into glue: take 5g of mineral-alkali eutectic product and dissolve in 50mLH 2 In O, stir for 15 min at room temperature, filter to separate insolubles, and take the supernatant. Add 5g of sodium silicate nonahydrate to the clear liquid, stir and mix well.

[0040] (3) Hydrothermal crystallization: the silicon-aluminum-containing gel described in step (2) is placed in a 100 mL hydrothermal kettle, heated at a constant temperature of 90°C, and the crystallization reaction is 6h-7h.

[0041] (4) Filtration and washing: filter after the crystallizatio...

Embodiment 3

[0043] The experimental raw materials are the same as in Example 1

[0044] The synthesis steps are:

[0045] (1) Ore-alkali eutectic: Take a certain amount of the above-mentioned tailings and solid NaOH, mix them and place them in a graphite crucible, and react in a muffle furnace. The ratio of ore to alkali is 1:1.5, and it is heated to 600°C for calcination and heat preservation. 30min. The calcined product is ground to less than 30 μm.

[0046] (2) Preparation into gel: take 5g of mineral-alkali eutectic product and dissolve in 50mL H 2 In O, stir for 15 min at room temperature, filter to separate insolubles, and take the supernatant. Add 5g of sodium silicate nonahydrate to the clear liquid, stir and mix well.

[0047] (3) Hydrothermal crystallization: the silicon-aluminum-containing gel described in step (2) is placed in a 100 mL hydrothermal kettle, and the crystallization reaction is heated at a constant temperature of 80° C. for 6-7 hours.

[0048] (4) Filtration and washing...

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Abstract

The invention belongs to the field of aluminosilicate compounds, and relates to a hydrothermal synthesis method of a 4A molecular sieve from high-iron bauxite tailings. The method comprises the following steps: (1) mineral / alkali co-melting; (2) gel preparation; (3) hydrothermal crystallization; and (4) filtration and washing. By preparing the 4A molecular sieve for detergent assistants from the bauxite tailings by mineral separation, the method has abundant raw material sources and lowers the production cost of the 4A molecular sieve. The method solves the environmental problem due to low utilization ratio and long-term discarding of the bauxite tailings, enhances the utilization ratio and added value of the bauxite tailings, and opens up a new way for comprehensive utilization of bauxite tailings.

Description

Technical field [0001] The invention belongs to the field of aluminosilicate compounds, and particularly relates to a method for hydrothermally synthesizing 4A molecular sieves from high-iron bauxite tailings. Background technique [0002] 4A molecular sieve is a kind of aluminosilicate compound with cubic lattice, with 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 into the solution. 4A molecular sieve replaces the sodium tripolyphosphate (STPP) in industrial synthetic detergents due to its unique structure and shape, high calcium exchange capacity, strong dispersibility, non-toxicity, etc., thereby reducing the incidence of growth worldwide Severe water eutrophication has reduced the environmental burden. [0003] At present, most of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/14
Inventor 张梅郭敏雷鹏程马东阳
Owner UNIV OF SCI & TECH BEIJING
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