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Water reducer drying technology
2020-07-23

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Recommended Dryer Model: LPG Series High Speed Centrifugal Spray Dryer

 

1. Product Overview:

The development of water reducer has a long history, from the early lignin sulfonate to the sodium salt of β-naphthalenesulfonic acid formaldehyde condensate (SNF) and sulfonated melamine formaldehyde condensate (SMF) that are commonly used in the market today. Water-reducing agent, now a new generation of highly efficient polycarboxylic acid polymer water-reducing agent has been developed at home and abroad, which has the characteristics of low doping, high water reduction, high reinforcement, low alkali, low shrinkage, high slump, green environmental protection, etc. More and more favored by the market. However, due to the characteristics of the process route, the polycarboxylic acid water-reducing agent has obvious shortcomings, that is, the market is supplied with 22% aqueous solution, the long-distance transportation cost is very high, and it is impossible to supply dry powder mortar and other fields that require powder. There are two reasons: one is that the polycarboxylic acid water-reducing agent polymerization process leads to its high water content, generally between 45% and 78%. It takes a lot of energy to make it into powder, and the expensive processing cost Its deep processing brings great difficulties; second, because the molecular weight of the polycarboxylic acid water reducer is relatively small, the softening point of the powder after drying is low, and the processing temperature is higher than the softening point for a long time, it will cause the water reducer Reactive groups may undergo side reactions such as imidization, resulting in yellowing of the product's appearance and a decrease in the dispersion of concrete.

2. Technology Overview:

Dry water reducer special dryer the high-temperature hot air generated by the hot air furnace combustion enters from the volute channel at the top of the drying chamber. Under the action of the hot air distributor, the uniformly rotating airflow quickly enters the drying chamber and maintains uniform air distribution in the tower. Liquid materials such as water-reducing agent pass through the atomizer which rotates at high speed to produce dispersed and fine material mist. The material mist is in contact with the swirling hot air, the moisture evaporates quickly, and the material is dried in a very short time, resulting in a hollow and thin wall Spherical product, which can dissolve quickly in water.

In recent years, our company has accumulated rich experience in the drying process of water reducers (Nai, anthracene, lignin, etc.), and has developed a number of technologically advanced equipment for the characteristics of water reducers.

In view of the shortcomings of the water reducer drying technology on the market, on the basis of in-depth study of product characteristics, combined with the transformation of the company's centrifugal spray dryer in other fields for heat-sensitive materials, ^ finally developed a special spray reducer for water reducer, completely solve the processing difficulties of polycarboxylic acid water reducing agent, the processed powder is white, and the powder has good fluidity. Fully ensure that the powder water reducer has a good dispersion effect on cement and the ability to maintain slump.

3. Technology Characteristic:

Our company's centrifugal spray dryer solves following problems of water reducer drying:

(1).The material sticks to the wall;

(2).The color turns yellow;

(3).The air sweep fails;

(4).The finished product regains moisture.

4. Dryer working process:

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