Vertical mill process limestone powder preparation techniques

As a FGD process with limestone desulfurization agent, lime stone powder through dissolving solid - liquid two-phase reaction, the reaction rate and limestone particle specific surface area is. Limestone powder particle size smaller, the quality of the surface area is greater, dissolving properties of limestone particles, a variety of related higher reaction rate. But the limestone particle size is smaller, the higher energy consumption broken. Usually require the limestone powder through 325 mesh sieve (44 micron) sieving rate reached 95%. At the same time granularity and limestone powder on the quality of. In order to ensure the desulfurization efficiency and the utilization of limestone reaches a certain level, when the high impurity content in limestone, limestone milling closer to. Using the traditional management of limestone powder, grinding technology for high energy consumption, low output, complicated process, fineness and particle size distribution is difficult to control. With the development of grinding technology, using grinding technology, because of its use of material layer grinding principle, low energy consumption (ratio of tube mill power consumption low 20~30%), product stable chemical composition, particle gradation are homogeneous, simple process flow.

Preparation process introduction

In limestone by automobile or forklift truck unloaded into the hopper, using a one-stage crushing limestone, limestone plate feeding machine will lime stones into the crusher, feed particle size control in general 400-500mm, the grain size control in about 15mm, crushed limestone conveyor equipment sent into the lime stone basement, base is arranged on the top of single charge dust precipitator.

The crushed limestone from the reservoir bottom timing belt scale batching, by belt conveyor feeding for grinding fineness of 250 mesh, the finished product is a limestone powder. Limestone powder grinding after the conveyor into a finished product warehouse storage. The reservoir base top is provided with single dust precipitator.

The finished product is located in bulk machine at the bottom of the reservoir, into the bulk tank car transport factory.

By vertical grinding of limestone powder for the main characteristics of the processing technology

grinding process using material layer touch the principle of grinding, grinding pressure adjustable, low noise, low energy consumption, small abrasion, high adaptability to raw materials, simple process, high system efficiency. The whole system for negative pressure operation, little dust pollution. Vertical mill grinding process, the product particle gradation are homogeneous, product fineness adjustable (product fineness of 600 mesh or above), at the same time, the product fineness can be rapid determination, correction.

Process of self production of domestic equipment, unobstructed by the production line process, investment, quick start, easy production and management. In the choice of production process scheme and equipment selection, the use of mature, reliable new process and new technology, the technology should be advanced, economic and reasonable, practical and reliable. Electrical automation control level to achieve reliable, practical. Attaches great importance to the comprehensive management of the environment, can reach the national standard. The main technical and economic indexes: lime stone powder fineness of 325 mesh, sieve residue: <5%; integrated power consumption: 45KW/ tons.

In conclusion, adopting the technology of limestone powder preparation of vertical mill process, fineness and particle size distribution of its products are homogeneous, the product fineness can be rapid determination, correction, can be very good with flue gas desulfurization need appropriate lime stone powder, improving the desulfurization efficiency. Its technological process is simple, energy consumption than traditional pipe mill process to reduce 20~30%, the product quality is greatly improved.