• Gypsum Extraction Line

    Gypsum/Anhydrite are produced from open-cast mines or underground mines using pillar and stall mining methods that give extraction rates of up to 75%.

    Gypsum is normally only screened to remove ‘fines’ (mainly mudstones), then crushed and finely ground. Gypsum/Anhydrite for cement manufacture is supplied in crushed form for further fine grinding with cement clinker.

    When Gypsum (CaSO4,2H2O) is ground to a powder and heated at 150° to 165° C, three-quarters of its combined water is removed producing hemi-hydrate plaster (CaSO4,1/2H2O), commonly known as the ‘Plaster of Paris’. When this powder is mixed with water the resulting paste sets hard as the water recombines to produce Gypsum again. This process can be repeated almost indefinitely, with important implications for recycling.

  • Gypsum Powder Production Line

    The Crusher will break the big-size gypsum ore into small 25mm pieces, and then the small pieces will be sent to the grinder, aftergrinding fine, the qualified raw gypsum ppowdwer will be sent to boilling furnace to calcine, and the unqualified part will be sent to grinder until it's qualified. After calcining, the qualified gypsum powder will be sent to storage or workshop.

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  • Gypsum Boards Production Line

    The development of all gypsum boards begins with a mineral rock, which is gray to white in color and is called gypsum. The basic mineral is composed of calcium sulfate chemically combined with water of crystallization. The combined water makes up approximately 20% of weight of gypsum rock. This is the feature that gives gypsum its fire resistant quality and makes it so adaptable for construction purposes.

    After gypsum rock is mined or quarried, it is crushed, dried, and ground to flour fineness, then calcined to drive off the greater part of the chemically combined water as steam. This calcined gypsum, commonly called plaster of paris, is then mixed with water and other ingredients and sandwiched between two sheets of specially manufactured paper to form various types of gypsum board or specially formulated and bagged for shipment as gypsum plaster or cement.

    Gypsum boards are formed in a highly automated continuous process. After the gypsum board has set, the boards are cut to length, dried, prefinished if required, and packed for shipment. All processing is in strict accordance with specifications and complies with more than 256 procedures and work instructions to meet quality standards and customer's satisfaction.

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  • Clinker & Cement Production Line

    Portland cement clinker is made by heating a homogeneous mixture of raw materials in a rotary kiln at high temperature . The products of the chemical reaction aggregate together at their sintering temperature, about 1,450 °C (2,640 °F). Aluminium oxide and iron oxide are present only as a flux to reduce the sintering temperature and contribute little to the cement strength. For special cements, such as low heat (LH) and sulfate resistant (SR) types, it is necessary to limit the amount of tricalcium aluminate formed. The major raw material for the clinker-making is usually limestone mixed with a second material containing clay as source of alumino-silicate. Normally, an impure limestone which contains clay or silicon dioxide (SiO2) is used. The calcium carbonate (CaCO3) content of these limestones can be as low as 80%. Second raw materials (materials in the rawmix other than limestone) depend on the purity of the limestone. Some of the second raw materials used are: clay, shale, sand, iron ore, bauxite, fly ash and slag. The clinker surface and its reactions in different electrolytic solutions are investigated by scanning electron microscope and atomic force microscopy.

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Gypsum Extraction Site

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Cement Plant Location

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