Desulphurization gypsum dryer has a new technology choice of microwave drying

According to different forging methods, alpha, beta and beta hemihydrate gypsum can be obtained respectively. & alpha; type hemihydrate gypsum is obtained by boiling and drying with saturated steam under pressure, also known as high strength gypsum, which is mainly used in the mould manufacturing of ceramics and pharmaceutical industries; & beta; type hemihydrate gypsum is obtained by heating and dehydration under gas phase conditions, also known as building gypsum, which is mainly used to manufacture gypsum board, gypsum block, or to process plaster gypsum after adding additives.

p>strong>desulfurization gypsum drying technologyequipment mainly includes continuous microwave drying equipment, high temperature sintering equipment, drying furnace, drum dryer, etc. The technical performance of various equipment and the comprehensive index analysis of drying products have their advantages and disadvantages. The key to the successful application of comprehensive utilization technology of desulfurized gypsum lies in the advancement of drying and calcining technology and equipment. At present, gypsum is mainly produced in rotary kiln and frying pan in our country. In recent years, intermittent frying pan has been successfully transformed into continuous frying pan, and gypsum is calcined in fluidized bed furnace. The development trend of gypsum calcination technology nowadays is: from intermittent discharge to continuous discharge; from indirect heating to direct heating; from slow dehydration to fast dehydration.

FGD gypsum can not be used directly. Usually it needs to be prepared into semi-hydrated gypsum (CaSO4 & middot; 0.5H2O, which is called ripe gypsum in industry). When dihydrate gypsum is heated to a certain temperature, it is easy to lose part of crystalline water and mature gypsum. Calcination process has always been the main factor affecting the quality and application of desulfurized gypsum products. In the calcination process of desulfurized gypsum, when the temperature rises and the dehydration speed speeds up, because of the poor thermal conductivity of gypsum, it is easy to cause uneven temperature distribution inside and outside of gypsum and form a multiphase mixture. Therefore, it is necessary to select appropriate calcination process measures to ensure the quality of calcined products. Some studies have shown that gypsum hydration crystals grow well and compactly at 180 (?) C, and exhibit excellent properties in setting time, standard consistency and strength. There are many advantages in microwave drying

. The following is a brief description of drying efficiency, color selection and intellectualization:

1, fast drying speed. Conventional methods such as steam drying, electrothermal drying, hot air drying, etc., need more than ten hours to dehydrate from 10% to less than 1%, only ten minutes to adopt microwave drying; six to seven hours to dehydrate from 5% to less than 1%, only a few minutes to adopt microwave drying; from 30% to 20% to dehydrate from 30% to 20%, and only 20 hours to adopt microwave drying. About a minute.

Conventional thermal drying often has heat loss in environment and equipment, and the indoor environment temperature is high. However, microwave directly acts on the material, so there is no additional energy loss, and microwave drying treatment does not have the above phenomena. The equipment can be used immediately without the thermal inertia of conventional thermal drying. It is flexible and convenient to operate. The microwave power can be adjusted. The transmission speed can be continuously adjusted from zero to facilitate operation.

2. Keep the original color of the material. Because microwave drying does not need heat conduction, the material itself is heated, the drying speed is fast, and the temperature of contacting material is much lower than that of conventional method, it will not cause material fission.

3. Pipeline operation, good operating environment. Compared with conventional methods, microwave equipment does not need boilers, complex pipeline systems, coal yards and transport vehicles, as long as it has the basic conditions of water and electricity. Generally speaking, it can save 30% - 50% of electricity. Improve the working conditions and save the area. The working environment of the equipment is low and the noise is low, which greatly improves the working conditions. The operation of the whole set of microwave equipment only needs 2-3 people. Microwave drying equipment can be connected with feeding machine, discharging conveyor, vibrating screen, packaging machine and other equipment to form a production line, which greatly improves labor productivity. There is no dust flying in the workshop, which meets the national GMP production standards.

p>strong>desulfurized gypsum dryer has a new microwave drying process selection, providing a variety of drying equipment selection options and quotations. This article is from the microwave dryer () network.