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Question:

Wet grinding machine using limestone particle size is not the smaller the better?

Wet grinding machine using limestone particle size is not the smaller the better?

Answer:

To measure a limestone with quantitative indicators on the performance of circulating fluidized bed boiler desulfurization is very difficult, but we can make some qualitative analysis: the contents of CaCO3 and MgCO3 in limestone desulfurization capacity is higher, stronger, better performance. The better the micro pore characteristics of CaO particles on the surface of CaCO3 particles in limestone, the better the performance. The characteristics of surface micro pores are the specific surface area and the distribution characteristics of pores along the surface. Limestone exists in two forms: crystalline and amorphous. The shape of the crystalline limestone is similar to that of sugar or salt, and the surface of the crystal has a flash effect due to the reflection of light. Amorphous limestone will not flash, the color is relatively simple. In the fluidized bed desulfurization, performance is better than that of amorphous crystalline limestone limestone, the reason is that the amorphous calcined limestone generated CaO surface porosity was much higher than that of crystalline limestone, limestone fragility also affect the desulfurization capacity. Some of the limestone particles are brittle and burst in the process of transportation and bed roasting and cycling. The water content of limestone is also a factor that can not be ignored. If the water content of limestone is higher, on the one hand, it will bring trouble to the crushing, conveying and feeding equipment. On the other hand, it also affects the ability of limestone calcination and desulfurization reaction in the bed. Generally, the moisture content is not more than 3%.
Most of the desulfurization with pneumatic conveying technology to transport from the type of desulfurization agent, desulfurizing agent, main materials are limestone and limestone as the main component of calcium hydroxide, calcium oxide, calcium carbonate. From the point of view of the shape of the material, both the powder, there are particles, as well as powder mixture, etc.. Due to the characteristics of these materials are not the same, the desulfurization effect is not consistent, so it is necessary to grasp the principle of desulfurization, but also fully grasp the characteristics of these materials, and to adopt and adapt to the pneumatic conveying technology to realize the stable conveying is particularly important.According to the requirements of power plant desulfurization process, the general requirements of limestone powder particle size is about 1mm, the small size of not less than 120 m, the bulk density of 0.9~1.1t / m3, repose angle of 0~34 degrees, the water content is less than 3%; but because of the limitation of conditions or the actual use of the distribution of limestone particles in 2.5mm~30 m. The large dispersion, is called limestone aggregate". Due to the purchase of lime stones will be rain, so after crushing limestone powder aggregate density up to 1.6~2.0t / m3.
The size of limestone used in wet mill is smaller, the better. The smaller the particle size, the higher the efficiency of the wet mill.The main component of limestone is calcium carbonate. Lime and limestone are widely used in building materials and industrial raw materials. The limestone is directly processed into stone and fired into quicklime. Quicklime absorption of moisture or water to become ripe lime, the main component is calcium hydroxide, lime prepared by the deployment of lime slurry, lime paste, used as coating materials and tile adhesives. Limestone reacts with all strong acids to produce calcium salts and carbon dioxide. The rate of reaction depends on the impurities in the limestone and the size of their crystals. The higher the impurity content, the larger the crystal, the smaller the reaction speed.

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