Product Introduction

Present development situation of desulfurized gypsum calcining industry
Proved reserves in eastern region didn’t increase much. Majority of mines has enter to middle and late mining stage. Reserve quantity, output capacity and grades drop down annually. Western regions hold rich resources. Geological conditions: simple and large reserve quantity. But, development and utilization condition are poor. With small market. The proportion of high-grade gypsum is small, only accounts for 1% to 2% of total. The supply problem in gypsum manufacturing industry has become major constraint for relevant enterprises. Therefore, it is very necessary to vigorously develop recycling of desulfurized gypsum.
The application of desulfurized gypsum in cement based materials is a main utilization method for desulfurized gypsum. It is indicated that there is no impurities in desulfurized gypsum which will affect the performance cement-based materials. Desulfurized gypsum is suitable to be used as additives. There is a certain amount of unreacted Caco3 and soluble salt, such as K＋and Na＋salt elements which is beneficial for speeding up cement hydration and motivate the full volatilization. Because of good fineness of desulfurized gypsum, it can fully mix with cement pellets and composite materials in cement. Quick reaction can effectively adjust cement solidifying time. For slag cement, fly ash cement and compound cement, desulfurized gypsum can works as both retarder and sulfate exciting agent for hydration process of composite materials. Caco3 also can also improve the structure and performance of cement hardened paste.
Having been specialized in desulfurized gypsum calcining and drying for many years, Zhengzhou Taida group developed out complete set of desulfurized gypsum drying disposal technology aimed at desulfurized gypsum, hemihydrate gypsum and stucco gypsum produced from thermal power plants and ceramic industries based on accurate understanding for market.
Characteristics of Taida desulfurized gypsum calcining process

1. Large heat transfer area in unit area; with compact structure and small area occupied.
2. High heat utilization efficiency; steam consumption will not excess 1 t for one ton β gypsum powder.
3. Can use various heat source to meet drying demand for desulfurized gypsum.
4. With exhaust heat recycling device, reduce energy consumption of system.
5. Special gypsum discharger and efficient air swept gypsum dryer developed by Zhengzhou Taida not only fill domestic technology gap, but also guarantee efficient and stable running.
6. There is no secondary dust pollution. Exhaust gas can meet national environmental protection standard. 

Product Superiority

1. Large heat transfer area in unit area; with compact structure and small area occupied.
2. High heat utilization efficiency; steam consumption will not excess 1 t for one ton β gypsum powder.
3. Can use various heat source to meet drying demand for desulfurized gypsum.
4. With exhaust heat recycling device, reduce energy consumption of system.
5. Special gypsum discharger and efficient air swept gypsum dryer developed by Zhengzhou Taida not only fill domestic technology gap, but also guarantee efficient and stable running.
6. There is no secondary dust pollution. Exhaust gas can meet national environmental protection standard. 
 

Technical Process

According to heating methods, building gypsum processing mode can be divided into two kinds, direct mode and indirect mode.
Direct airflow method

Direct airflow method is a kind of unique and efficient gypsum calcining drying process which is developed by our patent technology. Here are some special features of this system:
Indirect method
1. Can utilize various types of heat sources such as flue gas, coal gas, steal or other accessible hot air.
2. This system holds compact structure and low investment cost. All technical parameters are checked and aligned.
3. According to the temperature of gas source, this system can carry out 180-degree slow calcining process. It can also carry out 300-degree moderate speed calcination. It can also even, 580-degree fast speed calcination is feasible.
4. This system holds low energy consumption. The calcining thermal efficiency will not be over 350000 kcal/ t βgypsum.
5. This system can be used to produce both dehydrate gypsum and semi-hydrated gypsum. It only needs 120-degree temperature to produce dehydrate gypsum. Therefore, this system can utilize low-temperature flue gas from thermal power plants.

Indirect method is a set of drying and calcining integrated process which is developed by our unique patent technology according to real situation of thermal power plants. This equipment can deal with free water and crystal water at the same time. With reasonable structure and design, it is more convenient to adjust product structure and control product quality. This method can be used to produce dehydrated gypsum and superior β gypsum.
Here are some special features of this drying system.
1. It holds larger heat transfer area in unit volume. It holds compact structure and less floor area.
2. It holds higher thermal efficiency. The steam consumption for one ton β gypsum powder will be not over one ton.
3. There are various types of fuels which can meet the requirement of gypsum calcination.
4. With exhaust heat recycle device, it can reduce energy consumption.
5. Zhengzhou Taida unique gypsum discharger and efficient air-swept gypsum dryer fills the technology gap at home. Compared with similar products, it holds higher working efficiency and stable performance.
6. There is no secondary dust pollution. Exhaust emission can meet national standard.

Achievements&Technology

Product Case

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