Gypsum is a mineral whose main chemical component is calcium sulfate, mainly found in sediments from ancient salt lakes or lagoons. Natural dihydrate gypsum (CaSO4 · 2H2O), also known as raw gypsum, can be calcined and ground to obtain β - type hemihydrate gypsum (CaSO4 · 1/2H2O), which is also known as building gypsum, mature gypsum, and plaster. If the calcination temperature is 190 ° C, model gypsum can be obtained, which has higher fineness and whiteness than building gypsum. If gypsum is calcined at 400-500 ° C or above 800 ° C, floor gypsum is obtained, which sets and hardens slowly, but its strength, wear resistance, and water resistance after hardening are better than ordinary building gypsum.
Gypsum itself has a high viscosity, and during the drying process, wet gypsum will be transported to the feeding hopper by a roller conveyor belt. The feeding hopper is directly connected to the drying drum, and the wet gypsum will enter the drying drum from the feeding hopper, coming into contact with the hot air flow inside the drying drum, thus starting the entire gypsum drying process. The entire gypsum drying process can be divided into three main parts. The first is that the wet gypsum comes into contact with the hot air flow inside the drying drum, and the temperature difference between the hot air flow and the wet gypsum is used to evaporate the moisture in the gypsum; There is a copying board installed on the inner wall of the second drying drum. The copying board can continuously pick up the gypsum, not only can it move, but also during the process of picking up and sprinkling the gypsum, the gypsum can fully contact with the hot air flow, thus facilitating faster and more efficient heat exchange between the hot air flow and the gypsum; The inner wall of the third drum is equipped with a green cleaning device, which is used to clean the clumps and materials adhered to the drum wall during the drying process to prevent blockage.
Our company's hot air circulation oven is equipped with a low-noise and high-temperature resistant axial flow fan and an automatic temperature control system. The entire circulation system is fully enclosed, which increases the thermal efficiency of the oven from the traditional drying room 3-7% to the current 35-45%. The highest thermal efficiency can reach 50%, making China's hot air circulation oven reach the advanced level at home and abroad. It has saved a lot of energy for our country and improved the economic efficiency of enterprises.

1. Heating sources include steam, electricity, far-infrared, and electric steam for users to choose from;
2. Operating temperature: Steam heating at 50-140oC, with a maximum of 150oC;
3. Electricity usage and far-infrared temperature range from 50 to 350oC;
4. Equipped with automatic control system and computer control system for users to choose from;
5. Common steam pressure is 0.02-0.8Mpa (0.2-8kg/m2);