Raw Material: gypsum
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Highlights: sound, heat and fire protection
Uses: construction, building materials, industrial molds, chemical industry and agriculture, food processing and pharmaceutical beauty and many other applications
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Gypsum powder is one of the five major gel materials, which is processed through crushing, grinding and other processes. It is widely used in construction, building materials, industrial molds and art models, chemical industry and agriculture, food processing, medicine and beauty and other applications. It is an important industrial raw material.
Gypsum has good sound insulation, thermal insulation, and fire resistance characteristics. In China, natural gypsum reserves are abundant and have been used for a long time. With the improvement of economic and technological levels, gypsum powder production equipment and processes also have more choices and more scientific configuration plans.
White and colorless transparent crystals are usually referred to as transparent gypsum, and sometimes they become gray, light yellow, light brown, and other colors due to impurities.
How do you manufacture gypsum powder? In order to ensure the quality and quantity of gypsum powder in production, many factories have chosen gypsum powder production lines that can be intelligently and automatically completed. From the different application fields of gypsum powder, the gypsum powder production line is mainly divided into construction gypsum production line and desulfurization gypsum production line.
Gypsum powder-making process
According to the process requirements, the construction gypsum production line is usually divided into five parts, including crushing system, storage conveying system, grinding system, calcining system, and electric control system.
STEP1. crushing system
The size and specifications of gypsum ores are different after mining, and the applicable crushing equipment is selected for preliminary crushing treatment according to the actual situation, and the particles with particle size not greater than 35mm are broken.
STEP2. storage conveying system
The crushed gypsum raw material is transported to the storage bin by the elevator. The storage bin is designed according to the requirements of the material storage time to ensure the stable supply of materials. At the same time, all parts of the material turnover are using lifts to reduce the floor area.
STEP3. grinding system
- The grinding process is the core process of gypsum powder production. The gypsum raw material in the storage bin enters the grinding machine through the vibration feeder for finishing. The electromagnetic vibration feeder is set under the storage bin, which is interlocked with the mill to adjust the supply of materials in time according to the running condition of the mill.
- The material is uniformly and continuously fed into the mill by the electromagnetic vibration feeder for grinding.
- The pulverized gypsum powder is blown out by the air flow from the mill blower and graded by the analytical machine above the main engine. The powder with the fineness meeting the specifications enters the large cyclone collector with the air flow, and is discharged as the finished product through the powder outlet pipe after collection.
- The finished product falls into the screw conveyor and is transported to the next system for calcining. The air flow flows from the return duct of the cyclone collector into the blower. The whole air path system is closed circulation and flows under negative pressure. Due to the water contained in the ground raw materials and the evaporation into gas during the grinding process, resulting in an increase in the air volume in the circulating air path, the increased air volume is introduced from the pipe between the large cyclone collector and the blower to the bag dust collector, and then discharged into the environment to ensure that the environment is clean.
- The particle size of the material through the grinding system is changed from 0-30mm to 80-120 mesh, which meets the requirements of the fineness of gypsum powder.
STEP4. calcining system
After grinding is completed, the pulverized gypsum powder is sent to the rotary kiln for calcining by the powder separator, the plaster of Paris is sent to the storage storage by the elevator, and the materials that do not meet the requirements are continued to be returned to the mill for grinding; The system mainly includes lifting machine, boiling furnace, electrostatic dust removal, Roots fan and other equipment.
STEP5. electrical control system
The electrical control system adopts the current advanced centralized control, DCS control or PLC control, and the control components are selected internationally well-known brand products
gypsum powder making machine
Crushing System: jaw crusher and impact crusher
jaw crusher has feed particle size of &#; mm, a discharge particle size is 10-350mm, and the production capacity can reach 1-t/h. Suitable for coarse crushing of large gypsum blocks, with strong crushing ability and high crushing ratio; Impact crusher feed particle size &#;mm, production capacity in 30-t/h, suitable for small hardness, Mohs hardness of 2 grade gypsum for fine crushing processing, and the discharge particle type is very good, uniform particle size.
Grinding System: Raymond mill, bucket elevator and vibrating feeder.
The grinding process of gypsum generally selects Raymond mill for processing operations. Raymond mill is good at high fineness grinding of non-flammable and explosive materials with Mohs hardness not greater than 9.3 and humidity below 6%. The feed particle size of Raymond mill is &#;25-&#;30&#;, the discharge particle size is 0.044-0.173&#;, and the class production is about 8-176t.
Calcination System: Rotary kiln
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Gypsum rotary kiln
Baghouse Dust Collector
Vibratory Feeder
Cement Bucket Elevator
Raymond mill
Cyclone Preheater
Jaw crusher
Impact Crusher
Gypsum powder production line main technical parameters
Annual production (tons),,,,,,,Main equipmentSpecificationsGypsum rotary kilnØ2.0×24mØ2.4×24mØ2.8×26mØ3.0×26mØ3.2×26mØ3.4×28mØ3.6×28mØ4.0×28mBaghouse dust collectorPPC96-6PPC96-8PPC128-6PPC128-9PPC96-2×9PPC128-2×7PPC128-2×9PPC128-2×12Raw materialDihydrate desulfurized gypsum (dry base) &#;90%, attached water content &#;15%, water-soluble magnesium oxide (dry base) &#;0.5%, PH value 6-8, chloride ion content (dry base) &#;500mg/kgcalcination temperature(&#;)150Steam consumption index&#;kd/t gypsum powder&#;500±50Power consumption&#;kw&#;h/tgypsum powder&#;25±5Desulfurized gypsum: gypsum powder1.4&#;1Setting timeInitial setting &#;8min, final setting &#;30minFineness&#;5%Strength&#;MPa&#;2 hours bending resistance &#;3.0MPa, compressive strength &#;6.5MPa;Three-phase controlDihydrous gypsum is less than 3%, semi-hydrous gypsum is more than 84%, soluble anhydrous gypsum is less than 3%;Emission concentration&#;mg/m3&#;&#;30Annual working days&#;300Overhaul period(year)3Heat source or fuelsteam, natural gas, pulverized coal
Introduction of raw materials of gypsum board product plant
The gypsum ores are crushed into small granules of the size less than 30mm, conveyed to mills to complete selecting and separating, and then the qualified powder are delivered into fluidized bed boiler for calcinations while the rest return to the mill. The qualified gypsum powders are carried into the storage bin or workshop for further use.
In the past, desulfurized gypsum slag was often treated by landfill, which seriously polluted the environment and occupied cultivated land. Now, the desulfurized gypsum slag can be made into gypsum powder for construction after being processed by DSJ series drying hammer mills, turning waste into treasure. Moreover, the performance of gypsum powder made by DSJ series drying hammer mills is exceeding than natural gypsum, and it is a high-quality raw material for manufacturing gypsum board.
Gypsum powder is one of the five major gel materials and occupies an important position in the national economy. The gypsum powder production line is to calcinate natural dihydrate gypsum ore (raw gypsum) or industrial by-product gypsum (desulfurized gypsum, phosphogypsum, etc.) at a certain temperature. It is ground to make the dihydrate gypsum dehydrated and decomposed. The product with β hemihydrate gypsum as the main component is the building gypsum (commonly known as plaster of gypsum).
The gypsum and FGD gypsum are fed from the inlet, effective contacting the surface of the heat exchange tube in the shell, and be burnt by the fume as a medium from the fluidized bed boiler and finally collected in the discharge outlet. Owing to the indirect heat exchange, the shell obtains higher regional vapor pressure which has positive effects on the quality of products. Moreover, there is no direct contact between the gypsum and heat carrier that keeps the maximum purity of the products. Indirect heat exchange model of rotating calcinations technique can effectively protect the gypsum against semi-hydrated gypsum by balancing the strength of the calcinations. This processing, adopting the advanced technology and taking the fluidized bed boiler as the heat source, which lowers the consumption of coal to its fullest extent and makes the full use of heat with output 100-t, is the ideal equipment for the calcinations of gypsum industry.
Based on Gypsum Plaster Manufacturing Process requirements, the construction gypsum product lines include crusher, mills, calcinations, storage and conveyor and control systems.
Crushing system
The gypsum ores are fed into crusher by the vibrating feeder, and crushed into small granules of the size less than 30mm for later use. Based on size of products and capacity requirements, the appropriate models can be adopted, like jaw crusher, hammer mills and impact crusher, etc. The dust collector is optional in order to keep the environment clean and satisfy the emission requirements.
Conveying system
The crusher gypsum is conveyed into the storage bin by the lifter. The design of the storage bin is based on requirements of the storage time to ensure stable supply.
Mill system
The materials are fed evenly and continuously into the mill by the vibrating feeder for grinding, and then the ground gypsum are blowing out by the blower for the analyzer to classify. The qualified powders go with the wind to the collector and are discharged by the tube as the final products which fall on the auger conveyors for the next stages of calcinations. It is close-recycled that the whole wind system is and adopts the bag filter between the wind collector and blowers, which filter the dust in the air and release into the atmosphere so as to prevent environment from pollution. The material sizes through mill system are changed from 0-30mm to 80-120 mesh and satisfy the gypsum requirements.
The mill system includes a lifter, storage bin, vibrating feeder, mills, auger conveyor and bag-type collector. The mill is adopting our latest patented Euro-typed miller (patented number is ZL 2 .8&#;ZL 2 .8&#;ZL 2 .9). There is an inside classifier, no necessity of outside one, which simplify the process.
Calcinations system
It includes the lifter, fluidized bed boiler, electro-static dust remover, roots blower, etc. The fluidized bed boiler is the most widely-used calcinations equipments in our country at present, which features smart shape, great capacity and simple structure, low failure rate and compact shape, low consumption, easy operation and self-control materialization, good quality of gypsum with ideal composure and stable physical performance, low operation cost, etc. It is widely used in the calcinations process of natural gypsum and chemical gypsum.
Control system
It takes the advanced centralized-control technology, DCS control and PLC control, adopting the well-known branded controls elements.
For more Gypsum powder manufacturing plantinformation, please contact us. We will provide professional answers.
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