Control of the settlement volume of light calcium carbonate at food grade

Settlement control of volume of food grade calcium carbonate, is a process of macro control system in the production process, each process will have a certain impact on the volume of the product, the factors affecting the size of many, such as the quality of limestone, calcination temperature, the activity of lime and lime lime milk digestion temperature, aging time on the tower, concentration, carbonization temperature, carbonization time, recycling water equipment, physical properties. Because the different ages of limestone lead to different crystalline structure of limestone, the production process of light calcium carbonate should be designed according to the characteristics of limestone. High volume products should be selected with high volume limestone. Structure activity depends on its lime (crystal smaller surface area is larger, the higher porosity, the higher the activity of lime), microstructure and calcination temperature, time of lime are closely related, so in addition to the size of limestone, but also improve the activity of light burned lime. The reaction of lime to water is called the digestive reaction, which can make up the deficiency of the activity of lime by increasing the temperature of the water. The undigested calcium oxide is fully digested by the aging of the emulsion from the digestive machine. The aging time has a great relationship with the volume of the product. At the early stage of carbonation, such as higher carbonization temperature and higher ash concentration, and the reaction of Ca (OH) 2 to 90%, the carbonization rate and sedimentation volume will be increased. The carbonization process is high power consumption in the process of light link, by changing the gas distribution, improve the kiln gas pressure, accelerate the velocity of gas diffusion, can greatly shorten the time of carbonization. In recent years, in order to save costs and improve the performance of equipment, especially the dehydration process equipment, enterprises have reduced the water content of filter cake to a minimum. However, this will affect the volume of products, so we must consider the impact on product volume while improving the device performance. With the development of the situation of environmental protection, wastewater production enterprises (solid-liquid separation of water spray dust, exhaust water), calcium carbonate particles of these two kinds of water also exist, but the presence of calcium ions also affect the volume of the product, so the former must waste water using the calcium ion separation.