Gypsum powder production line

SHANGHAI SHIBANG MACHINERY CO., LTD is one high-tech enterprise, which involves R&D, production, sales and service as well. In the past 20 years, we devote to producing mining equipments, sand making machines and industrial grinding mills, offering expressway, rail way and water conservancy projects the solution of making high grade sand and matched equipments.

Gypsum powder production line

Gypsum powder is one of the five major gel materials and plays an important role in the national economy. The gypsum powder production line is to heat natural dihydrate gypsum ore (raw gypsum) or industrial by-product gypsum (desulfurization gypsum, phosphogypsum, etc.) after heating at a certain temperature. And grinding, so that the dihydrate gypsum is decomposed and decomposed, and the obtained product containing β hemihydrate gypsum as the main component is the building gypsum (passing for the plaster).

Based on more than 20 years of experience in research and development of milling equipment, SBM Machinery Technology has developed a set of high-yield and high-efficiency gypsum powder production technology for the production of gypsum. This technology is a dry process for self-grinding. Through the frequency conversion high-efficiency classifier, the gypsum can be directly ground to meet the “Building Gypsum” GB/T9776-2008 standard, without the need for external screening or sorting. At the same time, due to the use of internal circulation wind, the gypsum powder that meets the finished product can be quickly selected, completely avoiding the phenomenon of over-grinding, greatly improving the output and production efficiency; due to the use of advanced dust collectors, the system meets the national environmental protection requirements.

 
gypsum-powder-production-line

The crusher breaks the large-sized gypsum ore into small pieces of less than 30mm, and sends them to the mill for grinding. After the grinding machine, the gypsum raw powder which has reached the required fineness of the product after grinding is sent to the boiling furnace for calcination. Partially returned to the mill for re-grinding until qualified. The qualified gypsum powder after calcination is sent to the clinker silo for storage or sent to the product workshop for use.

The working principle of gypsum powder production is to add raw gypsum and desulfurization gypsum from the inlet, and make effective contact with the outer wall of the heat exchange tube in the cylinder. The flue gas is used as the medium to heat and calcine the desulfurized gypsum. The calcined product is collected from the discharge port. . Because of the indirect heat exchange, a high partial pressure of steam can be obtained in the cylinder, which has a positive impact on the quality of the product. In addition, the gypsum is not in direct contact with the heat carrier, and the purity of the product is kept to a maximum extent. The indirect heat exchange rotary calciner technology can effectively control the removal of gypsum from hemihydrate gypsum into hemihydrate gypsum by strictly controlling the calcination strength. The main advanced technology used in this process, using a boiling furnace to provide heat source, can minimize coal consumption, and make full use of heat, 100-1000 tons per day, is an ideal equipment in the current industrial gypsum calcination process.

According to the process requirements, the building gypsum production line is usually divided into five parts, namely the crushing system, the grinding system, the calcining system, the storage conveying system and the electronic control system.

(1) Crushing system: The gypsum raw material enters the crusher through the feeder, and the crusher breaks the large-sized gypsum ore into small pieces of less than 30 mm for use. According to the size of gypsum raw materials and different production requirements, you can choose the crusher of the corresponding specifications, usually choose PE jaw crusher, PC hammer crusher or PF impact crusher. In order to protect the environment, it can be equipped with dust removal equipment to meet environmental emission requirements.

(2) Raw material transportation: The crushed gypsum raw material is transported to the storage bin through the hoist to be used. The storage bin is designed according to the requirements of material storage time to ensure a stable supply of materials.

(3) Grinding system: The material is evenly and continuously fed into the mill through the electromagnetic vibrating feeder for grinding. The ground gypsum powder is blown out by the air blown by the mill blower and classified by an analyzer above the main machine. The powder with fineness conforms to the specification, enters the large cyclone collector with the wind flow, and is discharged after being discharged through the powder discharge tube. The finished product falls into the screw conveyor and is transported to the next system for calcination. The entire air duct system is closed and closed. A bag filter is introduced from the pipe between the large cyclone collector and the blower to remove dust from the air and then discharged into the environment to ensure a clean environment. The material of the grinding system is changed from the particle size of 0-30mm to 80-120 mesh, which meets the requirements of gypsum powder fineness.

The main equipment of the grinding is hoist, storage bin, vibrating feeder, mill, screw conveyor, bag filter and so on. The mill adopts the latest patented product of our company, the European version of the mill (patent product number: ZL 2009 2 0088889.8, ZL 2009 2 0092361.8, ZL 2009 2 0089947.9), because the mill has a powder selection device inside, no external The classifier makes the process simple.

(4) Calcination system: The system mainly includes equipment such as hoist, boiling furnace, electrostatic precipitator and Roots blower. The boiling furnace used is the most widely used building gypsum calcining equipment in China. It has small equipment, large production capacity and simple structure. It is not easy to damage the equipment. It has low energy consumption and low operation. It is easy to realize automatic control, and the product quality is good. The gypsum phase composition is ideal, the physical properties are stable, the capital investment is low, and the operating cost is low. It is widely used in the calcination process of natural gypsum and chemical gypsum.

(5) Electrical control system: The electrical control system adopts the current advanced centralized control, DCS control or PLC control, and all control components are selected from international famous brand products.

Gypsum powder product technical indicators

  • (1) Product quality: meets or exceeds the requirements of the national “Building Gypsum” standard (GB9776-2008).
  • (2) Fineness: 80-200 mesh, sieve remaining “10%.
  • (3) Flexural strength (direct relationship with raw materials): ≥1.6Mpa; compressive strength: ≥3.0Mpa.
  • (4) Main phase composition: content of hemihydrate gypsum: ≥60% adjustable

The working principle of the gypsum powder production line is to add raw gypsum and desulfurization gypsum from the feeding port, and make effective contact with the outer wall of the heat exchange tube in the cylinder body. The desulfurization gypsum is heated and calcined by using the flue gas of the boiling furnace as a medium, and the calcined product is collected from the discharge port. . Because of the indirect heat exchange, a high partial pressure of steam can be obtained in the cylinder, which has a positive impact on the quality of the product. In addition, the gypsum is not in direct contact with the heat carrier, and the purity of the product is kept to a maximum extent. The indirect heat exchange rotary calciner technology can effectively control the removal of gypsum from hemihydrate gypsum into hemihydrate gypsum by strictly controlling the calcination strength. The main advanced technology used in this process, using a boiling furnace to provide heat source, can minimize coal consumption, and make full use of heat, 100-1000 tons per day, is an ideal equipment in the current industrial gypsum calcination process.

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