Limestone powder preparation process is as follows: large lump lime writing after jaw crusher crushing to the desired size, by the elevator will be sent to the storage hopper, then through vibrating feeder will its uniform quantitative continuously into the mill the indoor host grinding of grinding, grinding of limestone powder by the wind, the classifier for classification.

The fineness of limestone powder with the air flow through the pipeline into the cyclone collector, for separation and collection. The collected limestone powder is discharged from the outlet and sent to the powder bin by the conveying device for desulfurization. The unqualified particles are separated by the separator and then thrown to the cylinder wall, and then back to the grinding machine after falling down the wall. The whole system operates under the negative pressure condition, and the system dust is not spilt to ensure the on-site cleaning. As the limestone inside the mill sometimes has a certain amount of water, the amount of heat produced during the grinding will turn it into vapour, which increases the total amount of gas in the system. At the same time, the total amount of gas in the system will increase due to the entry of the pipe and the limestone into the system. Friction heat can also heat up the gas and expand the volume. At this point, in order to maintain the system's negative pressure operation state, the valve between the machine and the host can be opened and the extra gas is automatically imported into the pulse cloth bag filter to ensure the environmental protection.

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