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As for the production of the cement, the next production procedure can be conducted after the limestone and other cement raw materials are processed by the grinding plant , which proves that the material grinding plays an important role in the production of cement. The following is the cement raw material grinding process and features.The grinding process is also known as grinding system. With different production methods, the raw material grinding process can be divided into two categories: wet type and dry type. The both kinds have open-system and closed-circuit system.
Open circuit grindingThe first stage open circuit grinding system refers to that the raw materials such as the limestone raw material and the appropriate amount of water enter the grinding mill to make the raw slurry. To add a set of short ball grinding mill or the grinding rod mill before the open tube mill to form the new mill, which is called the secondary open circuit grinding system. The first stage open circuit grinding system is most widely used. Open circuit pipe mill process is simple, it is easy to operate, but the power consumption is higher; the open rod mill also has the advantages of simple process, low power consumption, strong adaptability to raw materials, which is the main form of wet raw material grinding system.
Closed-circuit grindingCompared with the open-circuit system, the closed-circuit production system not only can greatly increase production, but also reduce power consumption. And because of the lower moisture of slurry, there is no need to be further concentrated so that the process is relatively complex. The closed-circuit system is generally used as the technical measures to increase the productivity for the existing open-circuit system. In the closed-circuit grinding system, the raw slurry should be sorted and the coarse materials return to the grinding miller to be grinded.

Good grinding effect means that the mill has high monomer dissociation degree, good fineness, high processing capacity and grinding efficiency, low consumption, power consumption and noise, as well as small liner wear. Grinding effect is closely related to grinding media system, so it is necessary to optimize the grinding media system.
At present, there are many factors that can influence the effect of ball grinder , such as the nature of the material, structure of mill and the operation of the mill. Due to the interaction between the factors, grinding optimization becomes a complicated problem. Generally, the nature of the material is the main source of interference in the process of grinding, we can make local adjustment on grinding machine structure, such as adjusting plate type. The operation factors of mill, especially the grinding media system can be adjusted so that get the best grinding effect; while, working system of grinding medium has the most direct and the most significant influence on grinding efficiency, particle size distribution characteristics and mineral monomer dissociation degree, so it has always been the focus of the grinding process optimization. The load of steel ball is an important factors that affect product quality. After grinding machine begin to work continuously, steel ball has been worn and torn, and the weight of steel ball is reduced continuously; in order to make up for the loss of the ball and keep load characteristics same, we need to add the balls on a regular basis. This is grinding media system, it directly decides the grinding efficiency. Because of the erratic natures of the ore in the production process, complex pulp properties and composition, and diverse processing medium material, the optimum grinding media system cannot be simply determined.

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Dissolved air flotation (DAF) is a water treatment process that clarifies wastewaters (or other waters) by the removal of suspended matter such as oil or solids. The removal is achieved by dissolving air in the water or wastewater under pressure and then releasing the air at atmospheric pressure in a flotation tank or basin. The released air forms tiny bubbles which adhere to the suspended matter causing the suspended matter to float to the surface of the water where it may then be removed by a skimming device.
Dissolved air flotation separation process is very widely used in treating the industrial wastewater effluents from oil refineries, petrochemical and chemical plants, natural gas processing plants, paper mills, general water treatment and similar industrial facilities. A very similar process known as induced gas flotation is also used for wastewater treatment. Froth flotation is commonly used in the processing of mineral ores.
Process description
The feed water to the DAF float tank is often (but not always) dosed with a coagulant (such as ferric chloride or aluminum sulfate) to flocculate the suspended matter.
A portion of the clarified effluent water leaving the DAF tank is pumped into a small pressure vessel (called the air drum) into which compressed air is also introduced. This results in saturating the pressurized effluent water with air. The air- saturated water stream is recycled to the front of the float tank and flows through a pressure reduction valve just as it enters the front of the float tank, which results in the air being released in the form of tiny bubbles. The bubbles adhere to the suspended matter, causing the suspended matter to float to the surface and form a froth layer which is then removed by a skimmer. The froth-free water exits the float tank as the clarified effluent from the DAF unit.

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