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[Chemical Knowledge]：Production and manufacturing method and process of phosphate rock

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The manufacturing method
of phosphate rock
1. Introduction

phosphate rock is an important chemical production raw material, widely used in agriculture, food, medicine, chemical and other fields. With the continuous progress of science and technology, the manufacturing method of phosphate rock has also been continuously developed. This article will introduce the manufacturing methods of phosphate ore, including beneficiation, roasting, acid hydrolysis and other steps, aiming to provide readers with comprehensive knowledge of phosphate ore manufacturing.

2. the nature and use of phosphate rock

phosphate rock is a kind of containing phosphorus ore, mainly by calcium phosphate, magnesium phosphate and other minerals. Phosphate rock is widely used, mainly for the production of phosphate fertilizer, phosphoric acid, phosphate and other chemicals, can also be used to manufacture matches, ceramics, glass and other products.

3. of phosphate rock manufacturing method

1. mineral processing

of phosphate rock manufacturing first from beneficiation began. The purpose of beneficiation is to separate the useful minerals and impurity minerals in the ore and improve the grade of phosphate ore. Common beneficiation methods include flotation, gravity separation and chemical beneficiation. Among them, flotation is the most commonly used beneficiation method, by adding flotation agent, so that useful minerals and impurities in the separation of the action of bubbles.

2. Roasting

roasting is an important step in the manufacture of phosphate rock. The purpose is to convert calcium phosphate in phosphate rock into tricalcium phosphate for the subsequent acidolysis reaction. Roasting is usually carried out at high temperatures, and the phosphate rock needs to be heated to 1000-1300°C to decompose the calcium phosphate into tricalcium phosphate and calcium oxide. In the roasting process, it is also necessary to control factors such as oxygen flow and temperature to ensure the roasting effect.

3. Acidolysis

acidolysis is a key step in the manufacture of phosphate rock to convert tricalcium phosphate into soluble phosphate. Sulfuric acid is usually used for acidolysis, and the roasted phosphate rock is mixed with sulfuric acid and reacted to form phosphoric acid and calcium sulfate. In the process of acid hydrolysis, it is necessary to control the concentration, temperature and reaction time of sulfuric acid to ensure the effect of acid hydrolysis and product quality.

4. Filtration and Washing
After the acidolysis of the
is completed, the reaction solution needs to be filtered and washed to remove impurities and insoluble substances therein. Filtration is usually carried out by vacuum filtration or pressure filtration, and washing is carried out with clear water or dilute acid solution.

5. Crystallization and Drying

The filtered and washed phosphate solution needs to be crystallized and dried to obtain the final phosphate rock product. Crystallization The phosphate is usually precipitated from the solution by cooling crystallization or evaporation crystallization. Drying can be carried out using an oven, fluidized bed, etc.
Precautions in the manufacturing process of
4. phosphate rock

1. Control reaction conditions and operating parameters to ensure product quality and production efficiency;
2. Strengthen equipment maintenance and maintenance to ensure normal operation and service life of equipment;
3. Strictly abide by environmental protection and safety regulations to prevent pollution and accidents.

5. conclusion The manufacturing method of

phosphate ore includes many steps, such as beneficiation, roasting and acidolysis. It is necessary to strictly control the reaction conditions and operating parameters to ensure product quality and production efficiency. At the same time, strengthening equipment maintenance and compliance with environmental protection and safety regulations are also important factors to ensure the smooth progress of the phosphate rock manufacturing process.

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