• MAGNESIUM OXIDE (MgO) PLANT
  • LITHIUM PRODUCTION LINE
  • GYPSUM POWDER PRODUCTION LINE
  • ALUMINUM ASH PROCESSING SYSTEM
  • ACTIVE LIME PRODUCTION LINE
  • LIME SLAKING PLANT
  • CEMENT GRINDING PLANT
  • CEMENT PRODUCTION LINE
  • MAGNESIUM SMELTING LINE
  • LECA PRODUCTION LINE
  • FRACTURING PROPPANT PRODUCTION LINE
  • SOLID (HAZARDOUS) WASTE INCINERATION SYSTEM
  • PULVERIZED COAL PREPARATION PRODUCTION LINE
  • GGBS PRODUCTION LINE
  • Grinding Mills
  • Kilns & Dryers
  • Conveyors
  • Crushers
  • Bucket Elevators
  • Dust Collectors
  • GYPSUM POWDER PRODUCTION LINE

    Processing capacity: 50,000-300,000 tons/year

    Processing materials: phosphogypsum, desulfurized gypsum, industrial by-product gypsum

    Process method: one-step method, two-step method

    We have complete set of process technology and core equipment R & D and manufacturing technology, and committed to the R & D and application of new technologies in the field of gypsum building materials.

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    Introduction

    Gypsum is a monoclinic mineral and a hydrate whose main chemical component is calcium sulfate (CaSO4). Gypsum is a widely used industrial material and building material. It can be used as cement retarder, building products, model making, medical food additives, sulfuric acid production, paper filler, paint filler, etc. The most widely used natural gypsum is dihydrate gypsum. Its active ingredient is calcium sulfate dihydrate (CaSO4·2H2O). Generally, gypsum is graded according to the content of calcium sulfate dihydrate in the ore. High-grade gypsum is mostly used as raw material for the production of special gypsum products, such as food, medical, artwork, models and chemical fillers; gypsum mines with calcium sulfate dihydrate content of less than 60% are rarely used; more than 60% The gypsum ore, depending on its content, is used in various fields such as building materials and construction.

    Dihydrate gypsum (CaSO4·2H2O) is also known as raw gypsum. After calcination and grinding, β-type hemihydrate gypsum (2CaSO4·H2O) can be obtained, namely, building gypsum, also known as plaster of paris and plaster. If the calcination temperature is 190℃, model gypsum can be obtained, and its fineness and whiteness are higher than building gypsum. If the green gypsum is calcined at 400-500°C or higher than 800°C, floor gypsum is obtained. The setting and hardening are slower, but the strength, wear resistance and water resistance after hardening are better than ordinary building gypsum.

    Advantages

    According to the product use, by adjusting the rotary kiln speed and steam consumption, the initial setting time of gypsum powder can be adjusted and controlled.

    1. The gypsum rotary kiln pipeline contains high-pressure steam, adopts low-temperature and slow-speed heat exchange, has a large heat exchange area, and the temperature of the heat exchange medium is more constant, and the calcination process is easier to control.

    2. The gypsum rotary kiln has large volume, large processing capacity, more sufficient drying and calcination, and more stable products.

    3. The one-step method simplifies the process, and the drying and calcination are continuously completed in the same equipment, and the control is simple, and the supporting equipment and control links are reduced.

    Technology

    The industrial by-product gypsum is fed into the steam tube bundle calcining kiln through box feeder, belt conveyor, vibrating feeder and other conveying equipment, and then calcined under 240 supersaturated steam; The calcined products are sent to the cooling bin for cooling through conveying equipment such as screw conveyor and plate chain elevator; The cooled semi-finished products are sent to the ex-grinding bin through screw conveyor, belt conveyor, plate chain elevator and other conveying equipment, and then sent to the ball mill for grinding after metering; The milled finished products are sent to the finished product warehouse for storage; After the finished product warehouse, a packaging machine can be set for packaging and sale, or the powder material can be directly transported by bulk truck to customers.

    Gypsumcalcinationprocess.jpg

    Parameter

    Main Equipment Configuration Table
    Capacity(wt)510152025304050
    Main EquipmentMain equipment models, and technical & economic index
    Rotary KilnØ2.0×24mØ2.4×24mØ2.8×26mØ3.0×26mØ3.2×26mØ3.4×28mØ3.6×28mØ4.0×28m
    Plaster MillØ1.2×4.5mØ1.5×5.7mØ1.83×5.5mØ2.1×6.5mØ2.2×6.5mØ2.4×7mØ2.4×8mØ2.6×8m
    Bag FilterPPC96-6PPC96-8PPC128-6PPC128-9PPC96-2x9PPC128-2x7PPC128-2x9PPC128-2x12
    Production Raw Material Requirementscalcium sulfate dihydrate content (dry basis) ≥90%, adhesion water content≤15%, water-soIubIe magnesium oxide (dry basis)≤0.5% PH vaIue 6-8 , chIoride ion content (dry basis)≤500mg/kg
    CaIcination Temperature/"C150
    Energy Consumption lndex/(kg/t lime)500±50
    Power Consumption lndex/(kw•h/t lime)25±5
    Desulfurization Gypsum: Gypsum Powder1.4:1
    Setting TimeInitial solidification≥8min, termination of solidification≤30min
    Fineness≤5%
    Strength (Mpa)2 hours flexural strength≥3.0M Pa; compressive strength≥6.5MPa;
    Three-phase ControlDihydrate gypsum is less than 3%, hemihydrate gypsum is greater than 84%, and soluble anhydrous gypsum is less than 3%;
    mission Concentration / (mg/m3≤30
    Annual Working Day / days≥300
    Overhaul Cycle/Year3
    Applicable FuelSteam, natural gas, pulverized coal

    Note:this configuration table is for reference only and varies according to customer requirements


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