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[Chemical Knowledge]：Manufacturing method and process flow of zinc sulfate

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The manufacturing method
of zinc sulfate
1. Introduction

Zinc sulfate is an important chemical, widely used in agriculture, medicine, food, metallurgy and other fields. In the field of chemical production raw materials, the manufacturing method of zinc sulfate has attracted much attention. In this paper, the manufacturing method of zinc sulfate is discussed in detail, aiming at improving the production efficiency and quality of zinc sulfate.

2. the nature and use of zinc sulfate

zinc sulfate is a colorless or white crystalline powder with strong hygroscopicity. It is easily soluble in water and insoluble in ethanol and ether. Zinc sulfate is often used as a trace element fertilizer in agriculture, which can promote the growth and development of crops; it is used as a zinc supplement in medicine and a drug for the treatment of skin diseases; it is used as a nutritional supplement and preservative in food; it is used as an additive for zinc plating and other metal surface treatment in metallurgy.

3. zinc sulfate manufacturing method

1. Wet production

Wet production is the main production method of zinc sulfate, its process including zinc ore roasting, leaching, purification, neutralization, crystallization, centrifugal separation, drying and other steps. The specific steps are as follows:

(1) zinc ore roasting: zinc ore is mixed with pulverized coal and then roasted in a rotary kiln to generate zinc roasting sand.

(2) Leaching: Zinc calcine is mixed with water and sulfuric acid for leaching to produce a mixed solution of zinc sulfate and iron sulfate.

(3) Purification: A reducing agent such as iron filings or pyrite is added to the mixed solution to reduce the iron ions therein to ferric hydroxide precipitate, which is then filtered and removed.

(4) Neutralization: A neutralizing agent such as milk of lime or sodium hydroxide is added to the purified solution, and the pH value is adjusted to 4.0-4.5 to precipitate zinc ions in the solution in the form of zinc sulfate.

(5) Crystals: The precipitated zinc sulfate crystals were centrifuged to obtain zinc sulfate crystals.

(6) Drying: The zinc sulfate crystals are dried to obtain finished zinc sulfate.

wet production process is mature, simple operation and low production cost, but it produces more waste residue and needs to be properly treated.

2. pyrogenic production

pyrogenic production of zinc sulfate mainly uses zinc slag or hot galvanized slag as raw materials, through acid leaching, purification, crystallization and other steps to produce zinc sulfate. The specific steps are as follows:

(1) Acid leaching: Zinc slag or hot galvanizing slag is mixed with dilute sulfuric acid and then acid leaching is performed to generate a mixed solution of zinc sulfate and iron sulfate.

(2) Purification: An oxidizing agent (e. g., hydrogen peroxide) is added to the mixed solution to oxidize iron ions therein to precipitate ferric hydroxide, which is then removed by filtration.

(3) Crystallization: The purified solution was evaporated and concentrated to precipitate zinc sulfate crystals.

(4) Centrifugal Separation and Drying: The precipitated zinc sulfate crystals are centrifuged and dried to obtain finished zinc sulfate.

fire process is simple, but the source of raw materials is limited and the production cost is high.
Precautions for the production of
4. zinc sulfate

1. Strictly control the production process parameters to ensure stable product quality.
2. Strengthen equipment maintenance and maintenance, improve equipment operation rate and production efficiency.
3. Strengthen the environmental protection treatment of waste water, waste gas and waste residue to ensure that the production process meets the environmental protection requirements.
4. Pay attention to safety production management and prevent production accidents.

5. conclusion The manufacturing methods of

zinc sulfate mainly include wet production and fire production, of which the wet production process is mature, easy to operate, low production cost, is the main production method. In the production process, the production process parameters should be strictly controlled, equipment maintenance and maintenance should be strengthened, environmental protection work should be strengthened, and safety production management should be emphasized to improve the production efficiency and quality of zinc sulfate.

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