Manufacturing method of diatomaceous earth
I. INTRODUCTION
Diatomaceous earth is a mineral with unique physical and chemical properties, which is widely used in the field of raw materials for the production of chemicals. Due to its unique pore structure, high specific surface area and good adsorption properties, diatomaceous earth plays an important role in catalyst carriers, filters, fillers and so on. In this paper, the manufacturing method of diatomite will be introduced in detail, in order to provide useful reference for the production of chemicals.
II. Properties and applications of diatomite
Diatomite is mainly deposited from ancient diatom remains, which has porous nature, high specific surface area and good adsorption properties. Therefore, diatomaceous earth has a wide range of applications in the field of raw materials for chemical production, such as as catalyst carriers, filter materials, fillers and so on.
III. Manufacturing Method of Diatomaceous Earth
1. Mining and Beneficiation
First of all, raw diatomaceous earth is extracted from the mine. Then, it goes through the beneficiation process to remove impurities and improve the diatomite grade. Beneficiation methods include gravity separation, flotation, magnetic separation and so on, depending on the nature of the ore.
2. Crushing and grinding
After beneficiation, the diatomite ore needs to be crushed and ground to reduce the particle size and increase the specific surface area. The crushing and grinding equipment can choose jaw crusher, ball mill, etc..
3. Acid washing
In order to improve the purity of diatomite, acid washing treatment is needed. The crushed and milled diatomaceous earth is mixed with acid to remove the metal ions and organic impurities. Commonly used acids include hydrochloric acid, sulfuric acid and so on.
4. Washing and drying
The diatomaceous earth after acid washing needs to be washed with water to remove the remaining acid and impurities, and then dried. Drying equipment can choose rotary kiln, flash dryer and so on.
5. Calcination
In order to improve the strength and stability of diatomaceous earth, calcination treatment is needed. The dried diatomaceous earth is calcined at high temperature to volatilize the organic matter and improve the purity of diatomaceous earth. Calcination equipment can choose rotary kiln, electric furnace and so on.
6. Screening and packaging
The calcined diatomaceous earth needs to be screened and graded according to different particle size requirements. The screening equipment can choose vibrating screen, tumbler screen and so on. Finally, the sieved diatomaceous earth is packed for easy transportation and use.
4. Precautions
1. During the manufacturing process, the operating conditions of each process should be strictly controlled to ensure product quality.
2. Attention should be paid to safety in the process of acid washing to avoid acid splashing out and injuring people.
3. Temperature and time should be controlled during the calcination process to prevent overcooking or sintering of diatomaceous earth.
4. In the sieving process, suitable sieves should be selected according to the product requirements to ensure that the particle size is qualified.
V. Conclusion
Diatomite, as an important raw material for chemical production, has a wide range of application prospects. High-quality diatomaceous earth products can be manufactured through the processes of mining, beneficiation, crushing and grinding, acid washing, water washing, drying, calcining and screening. During the manufacturing process, the operating conditions of each process should be strictly controlled to ensure product quality and safety. The manufacturing methods introduced in this paper can provide useful reference for the production of chemicals and promote the application and development of diatomaceous earth in the chemical industry.
