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Preparation method of mendozite

A sodium alum and seed crystal technology, which is applied in the direction of aluminum sulfur compounds, aluminum sulfate, etc., can solve the problems of complex process, small particle size of sodium alum products, and uneven particle size distribution

Inactive Publication Date: 2016-06-22
WUHAN UNIV OF SCI & TECH
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Problems solved by technology

The "aluminum sulfate + sodium sulfate" process has the characteristics of convenient operation, high yield, and stable product quality; while the "aluminum sulfate + sodium chloride" process has disadvantages such as complex process, low yield, and unstable product quality
However, the main problem and difficulty of the sodium alum produced by the existing "aluminum sulfate+sodium sulfate" process is that the product particle size is small, and the particle size distribution (CSD) is unevenly distributed, which restricts the product added value and market competitiveness of domestic sodium alum

Method used

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Examples

Experimental program
Comparison scheme
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Embodiment

[0013] A kind of preparation method of sodium alum, its concrete steps are:

[0014] Step 1, first mix aluminum sulfate, sodium sulfate and water according to the following ratio, wherein: aluminum sulfate is 25~35wt%, sodium sulfate is 10~15wt%, and the rest is water; then at normal pressure, 80~100 ℃ and 150-500r / min rotating speed conditions, stirring for 1-2h to prepare sodium alum crystallization mother liquor Ⅰ;

[0015] Step 2. Evaporate and concentrate the sodium alum crystallization mother liquor I prepared in step 1 to a solution density of 1.2~1.4g / mL under normal pressure or a vacuum of 0.02~0.05MPa to obtain sodium alum crystallization mother liquor II ;

[0016] Step 3: Add seed crystals to the sodium alum crystallization mother liquor II prepared in step 2 under normal pressure, 80~100°C and 150~500r / min, and stir for 0.5~1h to prepare a suspended crystal slurry ;

[0017] Step 4. Under normal pressure and a rotational speed of 150-500r / min, cool the suspende...

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Abstract

The invention relates to a preparation method of mendozite. The preparation method comprises mixing aluminum sulfate, sodium sulfate and water at a temperature of 80-100 DEG C so that the mixture undergoes a reaction, carrying out evaporative concentration on the reaction product, adding seeds into the product and carrying out cooling crystallization to obtain mendozite crystals. The preparation method has the characteristics of uniform particle size distribution and large average particle size.

Description

technical field [0001] The invention belongs to the technical field of industrial crystallization, and in particular relates to a preparation method of sodium alum. Background technique [0002] Sodium alum, NaAl(SO 4 ) 2 12H 2 O, commonly known as sodium alum, sodium aluminum sulfate dodecahydrate, etc. Sodium alum is a double salt of sodium sulfate and aluminum sulfate containing crystal water, colorless cubic octahedral crystal or white crystalline powder, non-toxic and odorless, soluble in water, insoluble in alcohol. Sodium alum is not only an industrial raw material, but also a widely used food additive. It is mainly used in fabric mordant, paint drier, water purifier, baking powder, as well as in medicine, leather tanning, papermaking, ceramics and other industries. [0003] According to its production raw materials, the current production of industrial sodium alum is mainly divided into "aluminum sulfate + sodium sulfate" process and "aluminum sulfate + sodium ch...

Claims

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Application Information

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IPC IPC(8): C01F7/76
Inventor 王海蓉
Owner WUHAN UNIV OF SCI & TECH
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