Decision,factors,silica,fume,a business, insurance Decision factors of silica fume active
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Microstructure: chemical composition ofsilicon meet the requirements of indicators, has been get the bestmicrostructure in refining, ensure its has the best activity to involve in the response,while pulverizing must minimize its deterioration effect of the natural microstructure, reduce the deformation between grain and grain, the majority ofsilica fume (more than 99.8%) remained in the original natural microstructure.Percussion method is the best method for pulverizing. Because it uses block waybroken silicon, make it splintering with the weakest link in vivo, notsqueezing, pressure, grinding to cause structure be out of shape.Surface area: particle surface area issurface area per unit mass occupied, with m2/g as unit. It is involved in thechemical reaction ability. Silica fumes specific surface area, the speed to participatein the reaction is fast, reaction is more perfect, high utilization ratio of silicon,the reaction region fluidized state is more ideal, silicon consumption rate islowest, which shows its high activity. Therefore the surface area has become animportant index of silicon powder activity.Grain size distribution: direct synthesisis fluidized in multi-stage, grain size gradually changes, its surfaceconstantly updated, complete reaction, silicon consumption has also decreased.Therefore, silica fume particle size match to particle, in order to obtain thebest effect, to formulate the most suitable particle size distribution. Thusthe milling method must ensure that the grain size composition is adjustable,and the yield was higher. Such as preparation of 1T 0.1mm~0.4mmsilica particles approximately 85% is the most suitable for the synthesisreaction.Surface protection: produce quality, grainindex requirements of qualified products powder, surface active need to protect,there are three principles: be benefit to chemical reaction; be conducive tothe prevention of combustion; helps maintain the loose and dry. Silicon has strongoxide performance, especially the fine powder, can burn in air when encounterfire, generating SiO2 and release a lot of heat.In the storage and transport, delivery of finishedpowder, generally adopts a closed, N2 storage and N2 delivery, this is also theeffective measures to protect silicon powder active. A silicon surface activityof the final judgment is the production practice, the effect of participatingin chemical reactions and how well the ability in market competition performance.Of course, in order to obtain the high activity, there is also a master offlour milling method problem, need a process of knowledge, must stand the testof time.Roll grinding method in milling process,need high energy consumption N2 protection, maintain the N2d 93% in pulverizing system, every perton of product need to use N2 >300m3,due to the circulating N2 rising temperature in pulverizing system, reached 60~70 , which also contains 7% oxygen,silicon surface N2, O2 also inevitably. But in the milling process, the steelconsumption is high, around 0.15kg/t,consumption of steel (iron ) adhered to the surface of silicon powder,the powder prepared by roller mill, the appearance is dark black. No N2protection impact rotation method of silica fume, the appearance is bright. Thepercussion mechanism of powder system temperature is lower than 40 ,steel consumption mainly in the blade, every per ton powder consume steel is about0.1kg~0.05kg below.Source:http://www.mhcmp.com
Decision,factors,silica,fume,a