Zhengzhou Dongding Machinery Co., Ltd. products

Lignite generally has the disadvantages of high humidity (30%-50%), low ignition point and large carbon dioxide emissions. The direct combustion of the non-extraction lignite raw coal, will bring serious problems of environmental pollution, and increase the cost of plant installation. Besides, higher water content leads to transportation cost increasing. To solve the above problems of lignite properties, our company developed of a new lignite drying system. The lignite dryer adopts a new technology of crushing the lignite and then drying it by rotary dryer. That Makes the drying process realized continuous, industrialized and automated. The diameter of the drying drum of our company ranges from Φ1.9 meters to Φ3.4 meters, and the length ranges from 24 meters to 40 meters. And the processing capacity of lignite dryer is 300~2500T/D, the moisture content can be reduced from 40±5% to 10±2%; low calorific value of lignite can be increased by 1000-1800Kcal.

Coal slime has high water content, large viscosity, small particles, not easy to transport, its economic value is low, very unstable, easy to weathering, According to these characteristics, Dongding has developed a special coal slime dryer, strictly control the drying temperature of the dryer, pressure, air volume and speed.

Three-layer dryer, also known as rotary dryer, is currently one of the main equipment in the mineral processing equipment. it is mainly used for drying particulate materials of a certain humidity and granularity, such as yellow sand used in mortar industry, grit in casting industry, slag used in building materials cement industry. According to the final moisture requirements, the moisture content after drying can reach 1%-0.5% or below.

Mineral dryers are generally suitable for drying granular and bulk materials, also can be used to dry sticky materials. They are often chosen to dry kinds of mineral for their robust processing capabilities and their ability to produce uniform results despite variance in feedstock. Mineral dryers are widely used in building materials, metallurgy, mineral processing, chemical industry, cement and other industries.

Sand rotary dryer (river sand dryer) uses 3-pass rotary drum dryer. Internal cylinder, middle cylinder and outer cylinder form a since the insulation structure.