Preparation method for active aluminosilicate

An aluminosilicate, active technology, applied in the field of comprehensive utilization of natural minerals, can solve the problems of high activation cost of natural minerals, single input product, material consumption, etc., and achieve the effects of easy promotion and implementation, wide source of raw materials and simple process flow

Inactive Publication Date: 2014-02-12
CHINA UNIV OF PETROLEUM (BEIJING) +1
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Problems solved by technology

But all there is following problem in above-mentioned activation process: (1) material consumption, energy consumption are high
At present, most natural minerals use high-temperature heat activation (about 800 ° C) or anhydrous sodium carbonate melting decomposition (700-1000 ° C) minerals, high energy consumption is the main reason for the high cost of natural mineral activation; (2) serious environmental pollution
Due to the high-temperature thermal activation and melting decomposition of anhydrous sodium carbonate currently used, due to the large consumption of fuel or the large amount of sodium carbonate used, a large amount of CO 2 (3) Due to the single feed product, the silicon-aluminum ratio of the activated product is difficult to adjust; (4) The activity of the activated product is low

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  • Preparation method for active aluminosilicate

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[0014] The invention provides a preparation method of active aluminosilicate, which comprises the step of reacting natural silicon-aluminum minerals in an aqueous alkali metal hydroxide solution with a concentration of more than 350g / L at 150°C to 300°C.

[0015] In the method of the present invention, the reaction can be carried out in an open system under normal pressure, and the solid-liquid mass ratio at the beginning of the reaction is greater than 40%.

[0016] Specifically, the activation method of the natural silicon-aluminum mineral based on the sub-molten salt system provided by the present invention comprises the following steps:

[0017] (1) Material preparation: Weigh alkali metal hydroxide and natural mineral raw materials according to the molar ratio of alkali metal hydroxide to the total molar ratio of silicon and aluminum in natural minerals (n(Si)+n(Al)) of 0.5 to 3:1 .

[0018] (2) sub-molten salt activation: the alkali metal hydroxide solution prepared by ...

Embodiment 1

[0031] Preparation of active sodium aluminosilicate

[0032] The natural silica-alumina mineral used in this embodiment is natural kaolin (produced by China Kaolin Company, particle size is less than 300 mesh). The mineral contains 44.6wt% of alumina and 50.5wt% of silicon oxide.

[0033] (1) Weighing materials: According to the ratio of the number of moles of sodium hydroxide to the total number of moles of silicon and aluminum in natural minerals is 2:1, a certain amount of NaOH and natural silicon and aluminum minerals are weighed, that is, 80g of NaOH and 78.2 grams of kaolin are weighed. g.

[0034](2) Sub-molten salt activation reaction: Dissolve the NaOH weighed in step (1) in 200mL deionized water, mix the kaolin powder weighed in (1) with the NaOH solution, and place it in polytetrafluoroethylene to react React in an open system under normal pressure at 200°C for 5 hours in the still, and obtain a reaction product after the reaction is completed.

[0035] (3) Separ...

Embodiment 2

[0042] Preparation of active sodium aluminosilicate

[0043] The natural silica-alumina mineral used in this embodiment is natural rectorite (produced by Hubei Mingliu Rectorite Co., Ltd., with a particle size of less than 100 mesh). The mineral contains 38.2wt% of alumina and 41.3wt% of silicon oxide.

[0044] (1) Weighing materials: According to the ratio of the number of moles of sodium hydroxide to the total number of moles of silicon and aluminum in natural minerals is 3:1, a certain amount of NaOH and natural silicon and aluminum minerals are weighed, that is, 120g of NaOH is weighed, and the retort Soil 94.1g.

[0045] (2) Sub-molten salt activation reaction: Dissolve the NaOH weighed in step (1) in 250mL deionized water, mix the retort earth powder weighed in (1) with the NaOH solution, and place In an ethylene reactor, react in an open system under normal pressure at 220°C for 6 hours, and obtain a reaction product after the reaction is completed.

[0046] (3) Sepa...

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Abstract

Belonging to the comprehensive utilization field of natural minerals, the invention provides a preparation method for active aluminosilicate. The method makes use of a sub-molten salt system to activate natural a silicon-aluminum mineral at low energy consumption and efficiently utilizes the activation product. The method adopts a high concentration alkaline solution as a medium to perform liquid phase activation reaction on a natural silicon-aluminum mineral so as to destroy the crystal structure of the natural silicon-aluminum mineral, thus forming the high activity aluminosilicate able to be used for molecular sieve synthesis. The decomposition temperature of the mineral is far below the roasting temperature of traditional thermal activation and alkali fusion activation, the crystal structure of the mineral can be fully destroyed at low temperature, simultaneous extraction of silicon and aluminum in the natural silicon-aluminum mineral can be realized, and the process is easy to operate. The method provided by the invention also extends the range of raw materials for molecular sieve preparation, not only greatly reduces the molecular sieve production cost, but also provides an effective way for high value added utilization of natural silicon-aluminum minerals.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of natural minerals, and relates to a process method for decomposing natural silicon-aluminum minerals at low temperature and utilizing them efficiently. Destroy the crystal structure of minerals and provide a highly active silicon-aluminum source that can be used for molecular sieve synthesis. Background technique [0002] Natural silicon-aluminum minerals are rich in a large amount of silicon-aluminum elements, and the basic skeletons of these minerals are composed of silicon-oxygen polyhedrons and aluminum-oxygen polyhedrons connected in various ways. These polyhedrons are mostly connected in the form of common corners, forming a frame-like, layered, chain-like, and ring-like island-like skeleton. Due to the stable chemical structure of most natural silicon-aluminum minerals, it is difficult to directly utilize the rich silicon-aluminum minerals. At present, silicon and alum...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/26C01B39/24C01B39/40
Inventor 鲍晓军李铁森刘海燕范煜石冈袁珮何盛宝于建宁
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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