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Phosphogypsum is a by-product of ammonium phosphate production in phosphate fertilizer enterprises, mainly containing impurities such as fluoride, phosphorus pentoxide, and organic matter. It is highly acidic and has a pH value as low as 1.9. Research has shown that these harmful impurities are important factors leading to low comprehensive utilization rate of phosphogypsum.
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Technical indicators of plaster powder products1. Product quality: Meet or exceed the requirements of the national "Building Plaster" standard (GB9776-2008).2. Fineness: 80-200 mesh, with a residue of 10%.3. Bending strength (directly related to raw materials): ≥ 1.6Mpa; Compressive strength: ≥ 3.0Mpa.4. Main phase composition: Content of hemihydrate plaster: ≥ 80% adjustableContent of plaster dihydrate:<5% adjustableSoluble anhydrous plaster content:<5% adjustable5. Initial setting time: 3-8 minutes adjustable; Final setting time: 6-15 minutes adjustable.6.
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In order to attain the above requirement, our enterprise have researched and developed a complete set of boiling furnace processing technology, the major fabric is good-quality steel. For example, warmth conductive oil pipe adopts seamless metal pipe (GB3087-82).
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Application of Plaster mill for Plaster Powder ManufacturingPlaster mill is suitable for grinding limestone, dolomite, kaolin, talc, mica, bentonite and other low hardness materials.
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In order to reach the above requirement, our company have researched and developed a whole set of boiling furnace processing technology, the main material is good-quality steel. For example, heat conductive oil pipe adopts seamless steel pipe (GB3087-82). Steel plate adopts carbon steel and low-alloy steel (GB713-86) ; Frame steel adopts international product .Furthermore , in the work of welding , all the workers have work certificate , after welding , the coil pipe will have a water pressure test , just in case of leakage of heat conductive oil .
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Backing Gypsum BoardsUses of Backing Gypsum Boards from gypsum board machine:For the walls and ceilings.gypsum-based fiberboardPartitions and tiles made of gypsum plaster blocksScreeds with self-leveling properties.Drywall White Board from gypsum board machine: Drywall is made out of thin gypsum board panels used to build walls. The board comprises two layers of special paper with a layer of gypsum rock sandwiched between them.
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The boiling furnace with low warmth and electrical energy consumption .In the section of energy: Most of the warmness is used to dehydration and decomposition, and the relaxation of small phase is used to warmth the air from the backside of the furnace.The warmth effectivity of the furnace is above 95%.
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Because the keel is made of wood, attention must be paid to fire prevention. The standard practice is to evenly apply fireproof coating on the surface of the keel, wait for the entire keel to turn white, and then nail it on the wall to ensure that the area in contact with the wall is also coated with fireproof coating.After the fireproof treatment is completed on the surface of the keel, the assembly can begin. The workers will use a nail gun to fix the joint of the two keels at an angle of 45 degrees.
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With the fast improvement of China's economy, paper gypsum board as a new constructing substances mild board in the important product, in the constructing ornament enterprise has been hastily promoted and applied, the modern-day home demand for grant situation, many companies are additionally actively planning to use home or the introduction of overseas superior technological know-how and tools funding in the building
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At present, there are nearly twenty large paper gypsum board production lines under construction and proposed in the country, of which six are production lines with an annual output of more than 20 million m2. From the perspective of the manufacturers that have been put into production and the manufacturers that are to be built, most of them are located in the eastern coastal zone, which is directly related to the rich gypsum resources in East China, the developed economy in the east, and the relatively developed gypsum board market.
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Capacity/M2Specification /mmShaping Number（piece）/timeShaping time/hourlengthheightthickness100,000 666mm 500mm （80－230mm）85－7120,000105－7150,000125－7200,000165－7250,000185－7300,000215－7350,000245－7
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This method is still widely used in the domestic ceramic industry.Pressure steaming method for frying pasteThis method first preheats the raw Plaster with a block size of 25-50mm after coarse crushing in hot air at 60 ℃, and then places it in a pressure cooker for 5-7 hours with saturated superheated steam at 1,3 atmospheric pressure (125 ℃). Then, hot dry gas at 200 ℃ is introduced until hot dry gas is discharged, resulting in a vapor pressure of hemihydrate Plaster.
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Capacity/M2Specification /mmShaping Number（piece）/timeShaping time/hourlengthheightthickness100,000 666mm 500mm 80－230mm85－7120,000105－7150,000125－7200,000165－7250,000185－7300,000215－7350,000245－7
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Plasterboard machinery 1# transverse kiln entry section: it mainly includes the automatic control of the pipeline of conveyor belt, roller table, solenoid valve, distributor and plate entry accelerator.
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Working principle of Wall Plaster MachineAfter the bulk material is broken, it is sent to the silo by the lift, and then evenly sent to the main grinding chamber by the electromagnetic vibration feeder. Material entering the grinding chamber is scooped up and placed between the grinding roller and the ring to be ground. After grinding, the fan blows air into the grinding chamber, and the powder is blown into the analyzer for sorting.
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Raw materials: Due to the small scale of home manufacturing lines, uncooked gypsum is commonly now not homogenized at once into grinding and calcining.
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China's gypsum board industry started late, but relatively rapid development.
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Impact resistant gypsum boardStandard or simple types of gypsum boards do not have the ability to withstand impact loads, which makes their durability poor. Impact resistant gypsum board is a special type of board with strong impact resistance.The advantages of gypsum as a building materialGypsum board has the following advantages in the field of constructionGypsum provides a smooth finished surface: Gypsum is also used for gypsum, providing a smooth surface without cracks.
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Gypsum board is made of gypsum, ithas been used as a constructing fabric for hundreds of years. Today, drywall panels are extensively used in modern-day constructions round the world. In addition to being handy to install, drywall affords a hearth safety measure for buildings.
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This technique is nonetheless broadly used in the home ceramic industry.Pressure steaming approach for frying pasteThis approach first preheats the uncooked Plaster with a block dimension of 25-50mm after coarse crushing in warm air at 60 ℃, and then locations it in a stress cooker for 5-7 hours with saturated superheated steam at 1,3 atmospheric strain (125 ℃).
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Because the keel is made of wood, interest should be paid to fireplace prevention. The wellknown exercise is to evenly observe fireproof coating on the floor of the keel, wait fore keel. the complete keel to flip white, and then nail it on the wall to make certain that the place in contact with the wall is additionally lined with fireproof coating.After nailing the keel frame, it is imperative to repair it to the wall.
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Differences in material selection for gypsum coresHigh quality gypsum board uses high-purity gypsum ore as the raw material, while inferior gypsum board lacks control over the purity of the raw material. Low purity gypsum ore contains a large amount of harmful substances, which can greatly affect the performance of gypsum boards. Clay and salt can affect the bonding performance of paper surface and gypsum core.
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According to customer needsMATERIALPlaster, chalk, clay, slurry and filter cake.APPLICATIONHeating Plant of limestone desulfurization project, stone powder maker for high-grade highways, coal grinding mill in environmental protection type boiler plant, the mill in mining firms.Introduction of raw materials of Automatic plaster machineThe Plaster 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.
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Process and equipment selectionAccording to the process requirements, the construction plaster equipment is usually divided into five parts, namely the crushing system, grinding system, calcination system, storage and transportation system, and electrical control system. Material transportation:The crushed plaster raw material is transported by a hoist to a storage bin for backup. The storage bin is designed according to the requirements for material storage time to ensure a stable supply of materials.
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