Roasting Process from Dihydrate Gypsum to Hemihydrate Gypsum

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Condition:	New	Type:	Flash Drying Equipment	Place of Origin:	Liaoning China (Mainland)
Brand Name:	SD	Model Number:	various	Voltage:	220-380v
Power(W):	Customized	Dimension(L*W*H):	Various	Weight:	various
Certification:	ISO9001:2008	Warranty:	one year	After-sales Service Provided:	Engineers available to service machinery overseas

Our company cooperated with the Huaneng Wuhan Yangluo Power Plant to develop this annual output of 100,000 tons of desulfurization gypsum production line process and equipment, and it is also the first annual 100,000 tones production line in the power industry in China. This project carried out a successful commissioning at one time at the end of 2008 and had been put into operation. In 2009, it passed the ministry-level authentication. 

Our company applies two-step process to carry out drying and calcination for the desulfurization gypsum of power plant. The so-called two-step process is to carry out the drying and calcination in two different equipments respectively. In two-step process, both Si De air drying plus fluidized furnace combination and air drying plus rotary kiln combination are available. Here we introduce the two-step calcination process in which the steam is heat source. The steam as heat source is applicable for the power plant to manufacture semi-hydrated gypsum. Take the steam from the power plant as the heat source, and the steam pressure is generally 0.8~1.6MPa, the steam temperature is 180~300 ?.

The production line in Yangluo Power Plant has the capacity of annual 100,000 tons of building gypsum powder. Take the steam as heat source, and steam temperature is 300 ?, steam pressure is 1.6MPa. According to desulphurization gypsum feature and by comparison, it applied Si De dryer for drying, and applied fluidized furnace for calcination to manufacture building gypsum powder.

Product Performance Data Obtained from Two-step Calcination Process in Huaneng Yangluo


Performance Parameters Table for Building Calcinated Gypsum Powder
Item		Unit	National Best Quality Standard	Electropositive Desulphurization Gypsum
Folding Strength(2h)		MPa	2.5	3.85
Compressive Strength(2h)		MPa	4.9	8.95
Coagulation Time	Initial Coagulation	Min:s	6:00	10:30
	Final Coagulation	Min:s	30:00	16:00
Water Consumption for Standard Consistency		%		64




Radioactive Data of Building Calcinated Gypsum Powder
Item	Unit	Measured Data	Radioactive Data
Radium Content 226 Ra	Bq/Kg	4.46	National Standard GB6566-2002	Electropositive Desulphurization Gypsum
Thorium Content 232 Th	Bq/Kg	0.33	Internal Exposure Index: 1.0	Internal Exposure Index: 0.0
Potassium 40 K	Bq/Kg	11.57	External Exposure Index: 1.0	External Exposure Index: 0.0

Dongda Power Engineering has rich experience in producing roasting process from dihydrate gypsum to hemihydrate gypsum made in China and we're well-known as one of the professional such manufacturers in China. Please be free to buy the cheap and customized equipment from our factory. As one of the famous brands, we won't let you down.