Clean production method of hydrocalumite

A clean production and hydrocalumite technology, which is applied in the field of fine chemicals, can solve the problems of high cost, production scale and application impact, increase the production cost of hydrocalumite, etc., achieve low production costs, avoid waste water and other pollution, and prepare short cycle effect

Inactive Publication Date: 2016-01-06
国家电投集团山西铝业有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the process obtains hydrocalumite, it also produces a large amount of low-value by-products dissolved in water. If discharged, it will pollute the environment. If it is recycled and processed, its cost is high, which indirectly increases the cost of hydrocalumite. Cost of production
If the environmental pollution in the production process of hydrocalumite cannot be effectively solved, its production scale and application will inevitably be affected

Method used

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  • Clean production method of hydrocalumite
  • Clean production method of hydrocalumite
  • Clean production method of hydrocalumite

Examples

Experimental program
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Effect test

Embodiment 1

[0018] Example 1: Bauxite is pulverized, and caustic soda (NaOH) solution is added to dissolve alumina in bauxite under high temperature and high pressure to obtain crude sodium aluminate solution. Then further purify, filter and concentrate to obtain a saturated solution of sodium aluminate. Weigh Ca(OH) according to the ratio of substance ratio of 4:2:1 2 , NaAlO 2 and Na 2 CO 3 , placed in the reactor, and excess deionized water was added to the reactor. After continuous stirring at room temperature, in an autoclave at 90 o C and keep it warm for 12 hours to age and grow crystals of the product. After taking out and cooling down to room temperature, the supernatant was poured off, the product obtained was rinsed with deionized water to neutrality and suction filtered, and the filter cake was placed at 60 o C dried in a vacuum oven to obtain solid hydrocalumite sample 1.

Embodiment 2

[0019] Embodiment 2: Bauxite is pulverized, and caustic soda (NaOH) solution is added to dissolve alumina in bauxite under high temperature and high pressure to obtain crude sodium aluminate solution. Then further purify, filter and concentrate to obtain a saturated solution of sodium aluminate. Weigh Ca(OH) according to the ratio of substance ratio of 3.5:2:1 2 , NaAlO 2 and Na 2 CO 3 , placed in the reactor, and excess deionized water was added to the reactor. After continuing to stir at room temperature for 5h, transfer to 160 o C aging in a high-pressure reactor for 6 hours to age and grow crystals of the product. After taking out and cooling down to room temperature, the supernatant was poured off, the product obtained was rinsed with deionized water to neutrality and suction filtered, and the filter cake was placed at 60 o C dried in a vacuum oven to obtain solid hydrocalumite sample 2.

Embodiment 3

[0020] Embodiment 3: Bauxite is pulverized, and caustic soda (NaOH) solution is added to dissolve alumina in bauxite under high temperature and high pressure to obtain crude sodium aluminate solution. Then further purify, filter and concentrate to obtain a saturated solution of sodium aluminate. Weigh Ca(OH) according to the ratio of substance ratio of 5:3:1 2 , NaAlO 2 and Na 2 CO 3 , placed in the reactor, and excess deionized water was added to the reactor. After continuous stirring at room temperature for 20h, transfer to 160 o C aging in a high-pressure reactor for 6 hours to age and grow crystals of the product. After taking out and cooling down to room temperature, the supernatant was poured off, the product obtained was rinsed with deionized water to neutrality and suction filtered, and the filter cake was placed at 60 o C dried in a vacuum oven to obtain solid hydrocalumite sample 3.

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Abstract

The invention provides a clean production method of hydrocalumite. The method includes the following steps that first, aluminum in raw material bauxite is completely dissolved out through caustic soda with the mass fraction of 25-32% to obtain intermediate product sodium aluminate; then, lime milk and sodium carbonate are added, wherein the ratio of the amount of substance of lime milk to the amount of substance of sodium carbonate to the amount of substance of sodium aluminate is (3-5):(1-3):1; the mixture is stirred at room temperature and then transferred into a high-pressure reactor to be subjected to heat preservation aging for 6-24 h at 90-200 DEG C; supernatant liquid is poured after the reaction is finished, and suction filtration is performed after a product is rinsed; finally, a filter cake is dried. According to the method, the unique by-product which is caustic soda with great value can be reused in the dissolution working stage of aluminum oxide production, so that the by-product is completely utilized, wastewater and other pollutants generated in production are avoided, the production cost is lowered, and meanwhile the environment is greatly protected.

Description

technical field [0001] The invention belongs to the field of fine chemicals, and in particular relates to a clean production method of hydrocalumite. Background technique [0002] Hydrocalumite, also called calcium-aluminum hydrotalcite, is an anionic clay that belongs to layered double hydroxides (LDHs). The structural formula is Ca 16 al 8 (OH) 54 (CO 3 )·21H 2 O, the special structure and composition of hydrocalumite and the controllability of the structure give it some special properties, not only has the same ion exchange capacity as ion exchange resin, but also has the same shape-selective adsorption and catalytic properties as zeolite, At the same time, it also has heat resistance, radiation resistance, acid and alkali resistance, "structural memory effect", compatibility of plate cations and adjustable pore size, etc. Therefore, it has become a new functional material with great potential and attractive prospects in flame retardancy, adsorption, ion exchange, c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/06
Inventor 赵光利陈惠康杨占红任恒广柴洪云王新璋程亚娟龙俊文星
Owner 国家电投集团山西铝业有限公司
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