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Method for producing food-grade zinc sulfate with industrial-grade zinc sulfate as raw material

A zinc sulfate, food-grade technology, applied in directions such as zinc sulfate, can solve the problems of increased production cost, reduced utilization rate of raw materials, human health hazards, etc., and achieves the effects of high production safety, reduced production cost, and shortened production cycle.

Inactive Publication Date: 2015-02-11
YICHANG RUITE FINE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] At present, sphalerite is mostly used as raw material to produce zinc sulfate at home and abroad. Usually, food-grade zinc sulfate products are obtained through roasting, leaching, impurity removal, evaporation concentration, and cooling crystallization. The main disadvantage of this method is: sphalerite A large amount of smoke and SO2 gas are produced during the roasting process, which deteriorates the working conditions and causes environmental pollution; some manufacturers use lye to recover SO2, which needs to increase the huge purification and dust removal equipment, which increases the production cost; in addition, sphalerite During high-temperature calcination, a part of zinc can generate zinc ferrite with low solubility, which reduces the utilization rate of raw materials
Or use industrial magnesium sulfate heptahydrate as raw material to obtain food-grade products through repeated dissolution, cooling and crystallization, centrifugal separation, drying and other processes. Because industrial-grade zinc sulfate contains harmful substances such as chromium, arsenic, and lead, its heavy metal content is greatly increased. Exceeding food-grade standards, there are serious hazards to human health
Moreover, the traditional zinc sulfate purification method has complicated process, high requirements on process conditions, many equipments and large investment

Method used

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  • Method for producing food-grade zinc sulfate with industrial-grade zinc sulfate as raw material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A kind of method that is raw material production food-grade zinc sulfate with technical grade zinc sulfate, comprises the following steps:

[0025] a. Dissolve industrial-grade zinc sulfate in ultrapure water, the weight ratio of material to water is 1:5, fully mix and stir, then filter, and the filtrate is set aside;

[0026] b. Add 0.5% food-grade hydrogen peroxide, 1.0% food-grade activated carbon, and 3% composite bioflocculant to the filtrate obtained in step a, stir and mix thoroughly and ultrasonically treat for 60 minutes, and pass through double filtration. use;

[0027] c. Heat the filtrate obtained in step b to 90°C and concentrate in vacuo for 90 minutes, until microcrystals appear, and the stirrer speed is 20r / min;

[0028] d. Cooling and crystallization, the agitator is 15r / min, centrifugal separation, after drying, food-grade zinc sulfate is obtained, and the solution is recycled to step a for use.

[0029] The comprehensive yield rate of the product ob...

Embodiment 2

[0031] a. Dissolve industrial-grade zinc sulfate in ultrapure water, the weight ratio of material to water is 1:4, fully mix and stir, then filter, and the filtrate is set aside;

[0032] b. Add 0.8% food-grade hydrogen peroxide, 0.8% food-grade diatomaceous earth and 2% composite biological flocculant to the filtrate obtained in step a, stir and mix thoroughly and ultrasonically treat for 90 minutes, filter through sand core and Microfiltration double filtration, the filtrate is ready for use;

[0033] c. Heat the filtrate obtained in step b to 80°C and concentrate in vacuo for 120 minutes until microcrystals appear, and the stirrer speed is 20r / min;

[0034] d. Cooling and crystallization, the agitator is 15r / min, centrifugal separation, after drying, food-grade zinc sulfate is obtained, and the solution is recycled to step a for use.

[0035] The comprehensive yield rate of the product obtained by the method is 75.1%, and the technical indicators of the product all exceed ...

Embodiment 3

[0037] a. Dissolve industrial-grade zinc sulfate in ultrapure water, the weight ratio of material to water is 1:5, fully mix and stir, then filter, and the filtrate is set aside;

[0038] b. Add 0.8% food-grade hydrogen peroxide, 0.8% food-grade activated carbon, and 3% composite bioflocculant to the filtrate obtained in step a, stir and mix thoroughly, ultrasonicate for 60 minutes, pass double filtration, and the filtrate is ready for use ;

[0039] c. Heat the filtrate obtained in step b to 85°C and concentrate in vacuo for 100 minutes until microcrystals appear, and the stirrer speed is 20r / min;

[0040] d. Cooling and crystallization, the agitator is 15r / min, centrifugal separation, after drying, food-grade zinc sulfate is obtained, and the solution is recycled to step a for use.

[0041] The comprehensive yield rate of the product obtained by the method is 73.6%, and the technical indicators of the product all exceed the requirements of the national standard.

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Abstract

A method for producing food-grade zinc sulfate with industrial-grade zinc sulfate as a raw material comprises the following steps: 1) dissolving the industrial-grade zinc sulfate with ultra-pure water, fully mixing and stirring, filtering, and thus obtaining a filtrate for standby application; 2) successively adding an oxidizing agent, a decoloring agent and a compound biological flocculant into the filtrate, stirring and mixing uniformly, and carrying out double filtration to obtain a filtrate for standby application; 3) heating the filtrate obtained in step 2) to 80-90 DEG C, and carrying out vacuum concentration for 90-120 minutes until micro-crystals appear; and 4) carrying out cooling crystallization, carrying out centrifugal separation, and drying to obtain the food-grade zinc sulfate. The method for producing the food-grade zinc sulfate is simple in production process, reasonable in design, high in production safety, and lower in cost; and the obtained product has the quality superior to national standards GB25579-2010, and has a broad market space.

Description

technical field [0001] The invention relates to a method for preparing food-grade zinc sulfate, in particular to a method for producing food-grade zinc sulfate by using industrial-grade zinc sulfate as a raw material, which belongs to the field of fine chemicals. Background technique [0002] At present, sphalerite is mostly used as raw material to produce zinc sulfate at home and abroad. Usually, food-grade zinc sulfate products are obtained through roasting, leaching, impurity removal, evaporation concentration, and cooling crystallization. The main disadvantage of this method is: sphalerite A large amount of smoke and SO2 gas are produced during the roasting process, which deteriorates the working conditions and causes environmental pollution; some manufacturers use lye to recover SO2, which needs to increase the huge purification and dust removal equipment, which increases the production cost; in addition, sphalerite During the high-temperature calcination process, a par...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G9/06
CPCC01G9/06
Inventor 时勤邵伟郑世国曾俊何文明
Owner YICHANG RUITE FINE CHEM
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