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Production Technology

 

All the cement companies of the Group adopt the most advanced new dry-process cement production flow,  including quarrying, raw material crushing and pre-homogenization, cement raw mix preparation and homogenization, raw mix preheating and calcination, clinker sintering, cement grinding, and cement storage and transportation (in bags or in bulk). Moreover, during the production process, high-efficient, energy-saving and environmentally-friendly equipment is used, which together with stringent production management leads to an operating rate of over 95% and product quality pass rate of 100%. This achieves the “Three Highs, One Low” production target of “High Quality, High Level of Environmental Protection, High Efficiency, and Low Cost”. The following lists the details of the production process:

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Limestone extraction:

Limestone is extracted from quarries using the benching method. After the primary crushing process, the crushed limestone is then transported to the processing plant on a belt conveyor through a vertical shaft and horizontal tunnels. This approach can achieve high production efficiency and reduce transportation costs, while minimizing damage to the excavation face. The mined out area will be reclaimed by planting trees, so that the mine can restore its former scenery. 

Raw material and fuel storage and pre-homogenization system:

A pre-homogenization system is in place to ensure storage safety and homogenization of each of the raw materials to be mixed and milled to form a correct chemical composition, including limestone, sandstone, iron and alumino-silicate, as well as coal. This system will significantly enhance the stability of mixing and sintering the raw meal into clinker.

Raw mix grinding and homogenization:

The finish grinding system of roller press or vertical mill is used to achieve low unit power consumption and high hourly production rate of machinery. This together with the use of pneumatic blending system and homogenization silos of raw meal ensures that the raw meal fed to the kiln is easy to sinter and homogenized.

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Coal grinding:

Vertical grinding mill and pulverized coal measurement equipment are used for safety and energy-saving and for ensuring the accuracy of measuring pulverized coal fed to the kiln burner.

Short rotary kiln sintering:

The most advanced Pyro-Rapid short-kiln precalcined preheating (Ф4.8×52M and Ф5×61M) system, together with 4- to 6-stage cyclone preheater and precalciner, as well as high efficient cooler are used to achieve rapid rise in temperature, high temperature sintering, rapid cooling, as well as energy-saving and high efficiency. Such will produce clinker of high strength and good stability, and which is easy to grind and homogenized.   

Cement grinding:

The semi-finish grinding system of roller press and ball mill, the finish grinding system of vertical mill or closed-circuit ball mill grinding system is used to achieve low unit power consumption and high hourly production rate of machinery. Such can ensure the quality and homogenization of cement and its adaptability with concrete additives. The production processes can be adjusted to meet different clients’ needs so as to achieve customers’ satisfaction with quality.

Slag grinding:

The finish grinding system of vertical mill is used to achieve low unit power consumption and high hourly production rate of machinery. Such can ensure the quality and homogenization of slag powder. Blending with the high quality, high-grade Portland Cement of “Skyscraper” brand, different types of quality Portland slag cement, such as PSA 42.5 and PSB 32.5, are produced.

Automated manufacturing process control system:

The entire production line adopted the Company’s self-developed automated manufacturing process control system, which combines control system and operation technology to form the most efficient cement production line.