Preparation method of sodium nitrate

A technology of sodium nitrate and calcium nitrate, which is applied in the direction of preparation of alkali metal nitrate, preparation and molding of alkali metal nitrate, ammonium orthophosphate fertilizer, etc., can solve the problems of high yield and low cost, and achieve good economic benefits and The effect of environmental benefits

Inactive Publication Date: 2019-06-04
安建春
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a kind of preparation method of sodium nitrate, all there is respective defect in the preparation m

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0019] Embodiment: adopt the present invention to produce sodium nitrate with nitric acid decomposition phosphate rock by-product calcium nitrate:

[0020] first step metathesis

[0021] The composition of the by-product calcium nitrate obtained through freezing is as follows:

[0022] Mix calcium nitrate with the gypsum filter residue washing liquid in the subsequent process and the returned sodium nitrate mother liquor, then add it to the metathesis tank, add sodium sulfate under stirring, carry out metathesis at 50°C~60°C, and react for 1~2h; then filter the reaction product , filter out the dihydrate gypsum that generates, wash with clear water, and the lotion returns; the sodium nitrate generated stays in the filtrate of this process;

[0023] The second step is to purify and remove impurities

[0024] Add stone powder and soda ash to the filtrate in the previous step, the ratio of stone powder and soda ash used is 3:1, neutralize to pH ~ 7.0, heat to boil and keep for ...

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Abstract

The invention discloses a preparation method of sodium nitrate. The method comprises the following steps: (1) double decomposition: mixing calcium nitrate with a gypsum filter residue washing liquid in the subsequent procedure and a returned sodium nitrate mother liquor, stirring and adding sodium sulfate to carry out double decomposition, filtering out generated dihydrate gypsum, washing with clear water, and returning washing liquor; and leaving the generated sodium nitrate in the filtrate; (2) purification for removal of calcium: neutralizing by adding stone flour and soda ash into the filtrate in the last step, heating to boiling, filtering, filtering out calcium carbonate, and drying to prepare fertilizer-grade dicalcium phosphate; and (3) evaporative crystallization separation: concentrating by sending the neutralized filtrate in the last step into a double-effect evaporator, and cooling for crystallization to obtain sodium nitrate crystal slurry: adding the sodium nitrate crystal slurry into a centrifugal separator, and separating to obtain a sodium nitrate product. The method can be adopted to convert waste residue calcium nitrate discharged from nitrophosphate fertilizer equipment by a freezing method into the sodium nitrate product, and has good economic benefit and environmental protection effect.

Description

technical field [0001] The invention relates to a preparation method of sodium nitrate. Background technique [0002] Sodium nitrate can be used as a decolorizing agent for molten caustic soda in the inorganic industry or used to make other nitrates. It can be used as a coloring agent for meat processing in the food industry, which can prevent meat from going bad and play a role in seasoning. In addition, it has a wide range of applications in the enamel industry, glass industry, chemical fertilizer industry, dye industry, metallurgical industry, machinery industry, pharmaceutical industry, etc., so the demand for sodium nitrate in many fields is very large . Contents of the invention [0003] The purpose of the present invention is to provide a kind of preparation method of sodium nitrate, all there is respective defect in the preparation method for solving existing sodium nitrate, thereby can't prepare high yield, high purity with lower cost and more convenient mode So...

Claims

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Application Information

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IPC IPC(8): C01D9/12C01D9/18C05B7/00
Inventor 安建春
Owner 安建春
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