detection of silica in microsilica-pg电玩城

microsilica (or silica fume) is amorphous, powdered sio2 collected by specially designed dust collectors after the oxidization of silicon steam through smoke flue during the smelting of silicon iron and industrial silicon. 

the average particle size of silica powder is 1% of the average particle size of cement at a value of 0.1-0.15 m. the specific surface area is 15-27 m2/g, with strong surface activity. according to the sio 2 content index, our products are divided into five specifications: 85%, 88%, 90%, 92% and 95%. 

under normal circumstances, the detection of silica content in silica fume is usually carried out by hydrofluoric acid weight method. before the detection of silica content, the loss of ignition should be detected first before the detection of silica content. 

1, microsilica silica fume of ignition loss detection test: accurate weighing microsilica 0.5 g sample, after about 105 ~ 105 ℃ drying, add to the platinum crucible, then through 950 ~ 1000 ℃ calcination 45 min, and then put the crucible on dry cooling to room temperature, weighing. again and again until constant weight is achieved. in equation (m-m1)/m x 100, the loss of ignition is: m1 -- the mass of the sample before burning, g; m -- the mass of the sample after burning, g;

2. hydrofluoric acid gravimetric method for detection of silica content in micro-microsilica silicon ash: accurately weigh the sample after determining the overburning loss by 0.25g, wet it with a little water, add 4-5 drops of sulfuric acid (1 1) and 5-7 ml hydrofluoric acid, heat it with low temperature to volatilize on the heating plate or electric furnace, and then cool it down when it is near dry. add 2 ~ 3 drops of sulfuric acid (1 1) and 3 ~ 4 ml hydrofluoric acid, continue heating evaporation to dry, then raise the temperature, white smoke sulphur trioxide to escape completely, the platinum crucible for high temperature furnace, 30 min in the temperature of 900 ℃ calcination. remove, cool to room temperature in a dryer, and weigh. again and again until constant weight is achieved. the mass fraction of sio2 dioxide in the sample is calculated as follows: sio2 dioxide =(m-m1)/m x 100. m 2 -- mass of residue and crucible, g; m -- the mass of the sample, g; 

gansu lixinyuan microsilica co., ltd. is a science and technology enterprise which integrates production, sales, technical service and brand agency, and has the license right of import and export goods. at present, the company mainly manages the microsilica, silicon iron, high purity silicon iron, silicon manganese, calcium carbide, building materials refractories and lubricants agents.