Method for preparing refined salt without antitackiness agent

A technology of refined salt and anti-caking agent, which is applied in the field of alkali metals, can solve problems such as insecurity, and achieve the effects of less impurities, good anti-caking and good anti-caking effect

Active Publication Date: 2010-08-04
山东肥城精制盐厂有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In fact, ferric ammonium citrate is not an anti-caking agent allowed in the process of salt production. Once ferric ammonium citrate is used as an additive, it will violate GB2760 "Hygienic Standards for the Use of Food Additives" and NY / T1040 "Green Food Edible Salt" standards. It belongs to illegal use beyond the scope, and the produced green food edible salt has unsafe factors

Method used

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  • Method for preparing refined salt without antitackiness agent
  • Method for preparing refined salt without antitackiness agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment one. refer to figure 1 . A preparation method of refined salt without anti-caking agent: input the brine with a NaCl content of 300 g / L into the inclined plate settler, and add caustic soda solution with a mass percentage concentration of 30% to adjust the pH value to 8 , and then the brine is input into the sedimentation tank, and after precipitation, it enters the original brine pool to obtain clean brine; through the feeding pump, the clean brine is pumped into the four-effect internal heating evaporation tank for evaporation, and the steam pressure is controlled at 0.3MPa. After concentrating and crystallizing, discharge the salt to obtain salt slurry, the solid-to-liquid ratio of the salt slurry is 3:7; the salt slurry discharged from each effect evaporation tank is first washed in a horizontal stirring tank, and Mg 2+ The brine with a content of 0.4 g / liter dissolves the sodium sulfate in the salt slurry, and then pumps it into a vertical salt washer ...

Embodiment 2

[0016] Embodiment two. refer to figure 1 . A preparation method of refined salt without anti-caking agent: after the brine with a NaCl content of 305 g / L is taken out, it is input into an inclined plate settler, and a caustic soda solution with a mass percentage concentration of 28% is added to adjust the pH value to 9 , and then the brine is input into the sedimentation tank, and after precipitation, it enters the original brine pool to obtain clean brine; through the feeding pump, the clean brine is pumped into the four-effect internal heating evaporation tank for evaporation, and the steam pressure is controlled at 0.25MPa. After concentrating and crystallizing, discharge the salt to obtain salt slurry, the solid-to-liquid ratio of the salt slurry is 3:7; the salt slurry discharged from each effect evaporation tank is first washed in a horizontal stirring tank, and Mg 2+ The brine with a content of 0.5 g / l dissolves the sodium sulfate in the salt slurry, and then pumps it...

Embodiment 3

[0017] Embodiment three. refer to figure 1 . A preparation method of refined salt without anti-caking agent: after the brine with a NaCl content of 305 g / L is taken out, it is input into an inclined plate settler, and a caustic soda solution with a mass percentage concentration of 28% is added to adjust the pH value to 9 , and then the brine is input into the sedimentation tank, and after precipitation, it enters the original brine pool to obtain clean brine; through the feeding pump, the clean brine is pumped into the four-effect internal heating evaporation tank for evaporation, and the steam pressure is controlled at 0.25MPa. After concentrating and crystallizing, discharge the salt to obtain salt slurry, the solid-to-liquid ratio of the salt slurry is 3:7; the salt slurry discharged from each effect evaporation tank is first washed in a horizontal stirring tank, and Mg 2+ The brine with a content of 0.5 g / l dissolves the sodium sulfate in the salt slurry, and then pumps ...

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Abstract

The invention discloses a method for preparing refined salt without an antitackiness agent. The method comprises the following processing steps of: collecting and treating brine, evaporating, crystallizing, washing salt slurry, drying, cooling and screening; when needing to iodize, uniformly adding 3 to 5 mass percent solution of potassium iodate into a wet salt production line after dehydrating the salt slurry to make the iodine content of finished product salt be between 20 and 50mg/kg. In the method, no antitackiness agent is added into the salt, so the salt fully meets the standards of national GB2760 'Hygienic Standard For Uses of Food Additives' and NY/T1040 'Green Food-Edible Salt', and has good anti-agglomerating effect, regular crystal form and uniform granularity; the Mg<2+> content is 40 mg/kg and is far lower than the stipulation of the NY/T1040 'Green Food-Edible Salt' standard; and a product has no obvious agglomeration phenomenon after being stored for 12 months.

Description

Technical field [0001] The invention relates to the technical field of alkali metals, in particular to a method for producing refined salt by utilizing natural sodium-containing brine. Background technique [0002] Refined edible salt is an indispensable edible product in people's daily life. At present, there are still two outstanding problems in the preparation process of refined salt. On the one hand, it is the problem of salt agglomeration. The agglomeration of sodium chloride crystals is its inherent characteristic. Salt is easy to absorb moisture when the relative humidity is above 75%, and will release moisture when the relative humidity is lower than 75%. This phenomenon repeats continuously, and agglomeration occurs when it reaches a certain level . At the same time, most enterprises basically use the external heating evaporation salt production process when producing refined salt. Because the external heating evaporation uses a forced circulation heating device,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/06
Inventor 阴建元国兴君李广常张栋
Owner 山东肥城精制盐厂有限公司
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