Application of laser particle size analyzer in particle size detection of activated clay

1. Activated clay and its applications

Activated clay is an adsorbent made of clay (mainly bentonite) as raw material, treated with inorganic acidification, rinsed and dried with water. It looks like a milky white powder, odorless, tasteless, non-toxic, has strong adsorption performance and can adsorb Colored substances, organic substances. It easily absorbs moisture in the air, and leaving it for a long time will reduce the adsorption performance. When used, it is advisable to heat it (80-100 degrees is appropriate) to revive it. However, when heated to above 300 degrees Celsius, it begins to lose crystal water, causing structural changes and affecting the fading effect. Activated clay is insoluble in water, organic solvents and various oils, and is almost completely soluble in hot caustic soda and hydrochloric acid. Its relative density is 2.3 to 2.5, and it swells very little in water and oil.

2. Application scope

Due to its large specific surface area, activated clay has strong adsorption capacity and high decolorization efficiency; it has low activity and does not react chemically with oils and other chemicals; it is used for liquid decolorization with fast filtration speed and low residual liquid rate, such as edible oil decolorization and sugar refining. Decolorization, etc.; after decolorization, the liquid is transparent and clear, with stable quality, no odor, no color reversion, and no acid reversion; the used product can be reused after proper treatment and will not cause environmental pollution. The series of products are widely used In adsorbents, granular clay, and color developers for carbonless copy paper.

(1) Adsorbent

1. Edible oil decolorizing agent grade products are widely used for decolorizing various vegetable oils, animal oils and mineral oils, such as soybean oil, rapeseed oil, peanut oil, cottonseed oil, sunflower oil, palm oil, coconut oil, castor oil, camellia oil, Corn germ oil, refined bran oil, sesame oil, tung oil, safflower oil, etc.

2. Sugar decolorization and decolorization grade products: finished sugar purified with magnesium-rich aluminum silicate, its color, reducing sugar content, pH value, sulfite ion content, chloride ion content, protein content, sugar boiling temperature and calcium and magnesium ions The content and so on all meet the current industry standards, saving about 60% of the decolorization cost. The decolored filter cake can be used as mixed feed to reduce environmental pollution and achieve comprehensive utilization.

3. Environmental odor absorbent products have good odor adsorption function and can eliminate odors in refrigerators, pet bedrooms, toilets and other places.

(2) Granular clay

(3) Developer for carbonless copy paper

Activated clay is a chemical product that has multiple functions of activated carbon and is much cheaper than activated carbon. It is widely used in all aspects of industrial production. Due to its low production cost, the processing industry of activated clay has developed rapidly and its prospects are broad.

3. The necessity of detecting activated clay particles

   Activated clay is obtained by processing bentonite through a mill, and different clay mills can be used according to the requirements of the finished product. Generally speaking, the commonly used equipment for processing activated clay include Raymond mill, high-pressure suspension mill and high-pressure micro-powder mill.

Different grinding equipment produces activated clay with different particle sizes. Therefore, the particle size detection of activated clay is also an important part of its production control. The application range of activated clay is very fast, and it can be made into granular clay after treatment. It has better adsorption than activated clay and is widely used in many aspects of industrial production, with broad market prospects. Therefore, the activated clay processing industry has also developed rapidly.

There are many ways to measure particle size. In recent years, laser particle size detection, which is most commonly used in laboratories, has become a popular particle testing instrument in the world because of its fast testing speed, good repeatability, and wide measurement range. This activated clay test used the Winner2008 laser particle size analyzer. The test report is as follows: