1.Hammer dryer

Function :The air dryer is used to bake the gypsum powder water containing less than 5% before entering the boiling furnace.
this step can increase the gypsum liquidity .when it come to the boiling furnace ,it can easy to calcinate ,so we have this step 

2.Modification grinding（ball mill ）

Function :Because the chemical gypsum powder has the quality problem, through the modification grinding, changes the chemical gypsum component characteristic, make the quality similar to the natural gypsum powder.

3.FD - chamber boiling furnace technology(hot iar )

The technology of FD - chamber boiling furnace technology can effectively prevent the mixing of raw materials with gypsum powder in the process of calcining .Traditional calcining technologies such as vertical boiling furnace , rotary kiln ,general boiling furnace, etc.Due to the effect of mixing function of the machinery and air flow, dihydrate gypsum ,semi-hydrated gypsum and anhydrite gypsum three-phase blending mutually in the process of boiling dehydration,It is inevitable that the phase composition of the final product will be polyphasic, and the product quality index will be reduced significantly.And FD - chamber fluid bed calcining process changes according to the temperature curve of gypsum powder , artificially divide calcining process into four relatively independent dehydration space, effectively avoid the phenomenon of high and low temperature material blending and the composition of the final product was improved .In the 1 and 2 areas of the main calcining furnace, high temperature heat transfer technology is adopted to rapidly heat and dehydrate the materials that have just entered the FD- chamber boiling furnace, and slowly dehydrate in the 3 and 4 areas.Under the action of high pressure wind, the whole material presents a fluid boiling state, which improves the efficiency of heat transfer and mass transfer in gas and solid powder..

                                                 Hot air boiling furnace and hot oil furnace technology comparison

1.Reduce investment

The system does not use hot oil kiln , which saves the fixed investment in this part (e.g., oil furnace body, circulating oil pump, pipe, insulation, valve, high-low oil tank, etc.)

2.Power saving

This system saves the circulation pump, the base power is 45KW/200T/24 hours, the motor 24 hours consumption of electricity is 45X24=1080 degrees

3.Maintenance cost

The oil stove is need to change a cycle oil once a year, and the replacement cost is about USD3174.60-4761.9The oil pipeline should be cleaned regularly, while the boiling wok is direct heat transfer and does not need to be cleaned.

4.Comprehensive utilization rate

Because of this system, using the waste heat utilization, tail smoke emission temperature less than 90 ℃, reduces the cost of coal, and heat conduction oil smoke exhaust temperature is 250 ℃ or higher, so the new technology is more energy saving. Built-in dust collecting device, simple structure, no need of power, no need maintenance, recovery of gypsum powder back to the calcining chamber. 2-5 tons of gypsum powder can be received daily, and 2 to 3 yuan($0.32-$0.48) per ton of gypsum powder can be reduced.

5.Quality adjustable

The system adopt FD - chamber boiling furnace technology, gypsum powder under different air temperature, different area, fully dehydration in different stages, make the product in the case of without adding any additives, the setting time can be adjusted in 3-15 minutes and normal consistency of 66% - 75%.

6.The installation period is short and the area is small

This system has simple structure, compact, no cumbersome pipe valves and related certificates. Easy maintenance, less land occupy .

7.Environmentally friendly

This system USES a three-stage dust removal, cyclone dust collect , the electric dust collect , water bath dust removal or bag dust collector, the discharge of tail smoke more clean. According to the requirements of users can provide users with more complete equipment and environmental protection technology.