Comparison of industrial silicon powder processing technology and equipment

Silicon powder processing is to provide qualified silicon powder for organic silicon methyl monomer synthesis equipment. Silicon powder processing equipment is mainly composed of silicon block storage, drying room, crushing and grinding system, pneumatic conveying, nitrogen recovery and so on. The grinding system is the core of the silicon powder processing equipment, the main function is to grind the silicon block to the size and grade of the silicon powder required for methyl monomer synthesis. As an industrial silicon powder processing equipment manufacturer, Guilin HCM Machinery will introduces the comparison of industrial silicon powder processing technology and equipment.

Grinding process and grinding equipment determine the particle size and grade composition of silicon powder. At present, the grinding equipment available in China are vertical grinding, Raymond grinding, steel ball grinding and so on. The selection of industrial silicon powder processing technology and equipment is mainly considered from the following aspects :a. Product particle size: The particle size and particle size composition of silicon powder are mainly determined by the fluidized bed used by each silicone manufacturer, and the particle size is generally in the range of 44~144um; b. Loss and service life of grinding parts; c. Energy consumption and nitrogen consumption of grinding silicon powder; d. Degree of automation; e. Equipment price.

First, the vertical grinding process of industrial silicon flour processing: the silicon block is dried and broken into the vertical grinding, the grinding silicon powder is brought out by the circulating air flow, collected by the collector, the received powder is screened by the vibrating screen, the coarse grain is returned to the mill, the fine grain is sifted into the finished product bin. Most of the dusty gas discharged by the collector is recycled, and a small part of the dusty gas (dust mass concentration < 50mg/m3) is directly discharged at high altitude.

Second, industrial silicon milling process of Raymond mill: silicon block after drying, broken into Raymond mill, grinding silicon powder is taken out by circulating air flow, dust collection by cyclone dust collector, the powder received by vibrating screen screening, screening. The upper material is returned to Raymond mill, and the lower material is sifted into the finished product bin. Most of the dust containing gas discharged from the cyclone dust collector circulates, and a small part of the dust containing gas is not up to standard, which needs to be discharged at high altitude after two stages of dust removal and one stage of washing.

Third, industrial silicon milling process: silicon block after drying, broken into the steel ball mill, the ground silicon powder is taken out by circulating air flow, separated by the separator, coarse particles return to the steel ball mill, fine particles through the cyclone dust collector dust into the finished product bin. Most of the dust-containing gas from the cyclone dust collector circulates, and a small part of the dust-containing gas is dedusted by the first-stage cloth bag and discharged at high altitude after the first-stage washing.

To sum up: vertical mill, Raymond mill, steel ball mill are industrial silicon powder processing equipment, Raymond mill and steel ball mill earlier used in grinding silicon powder, but because of complex process flow, low efficiency, silicon powder product particle size is finer, process parameters adjustment is difficult, loud noise, need to add sound insulation; Grinding medium grinding roller, steel ball, liner consumption is large; Silica powder has high iron content; Grinding has high oxygen content requirements on the system, must be carried out under nitrogen protection, nitrogen consumption is large, so the new silicone plant has rarely used Raymond mill and steel ball mill to grind silicon powder. Vertical grinding is widely used in cement, non-metal, chemical and other industries, compared with Raymond grinding system, vertical grinding has the following advantages :a. The vertical grinding system has the advantages of less equipment, simple process and good system sealing; b. The vertical grinding system uses one level of dust collection, high efficiency and easy operation, while Raymond mill is three levels of dust collection, the process system is complex and the efficiency is low; c. Raymond mill for suspension roller mill, and vertical mill for press roller mill, good safety; d. The vertical grinding system has low noise, measured at 85 decibels, without soundproofing; e. Vertical grinding system has lower energy consumption per unit product than Raymond grinding system.

As an industrial silicon milling equipment manufacturer, we have Raymond mill, vertical mill, ring roller mill and other industrial silicon milling equipment for customers to choose. Among them, the vertical grinding system has the advantages of simple process, convenient operation, safety, good dust collection effect, suitable particle size and grade composition of silicon powder, high degree of system automation, equipment noise and low energy consumption per unit product, nitrogen consumption is much lower than Raymond grinding system, and will become the advanced equipment for industrial silicon milling processing in the future.

Contact Way:mkt@hcmilling.com