마이크로실리카, 실리카흄이라고도 함, 실리콘 금속 및 페로실리콘 산업의 부산물입니다.. 이 비정질 이산화규소 (SiO2) is generated as a gas during the reduction of highly pure quartz in submerged electrical arc furnaces. As the molten metal is produced, a silica-based gas is emitted. This gaseous fume, upon rising, cools rapidly and forms extremely minute, 무정형, spherical particles.

마이크로실리카: A Closer Look at Its Formation

The microsilica is collected in a bag house, a system designed for filtering the hot air and gases vented from the furnace. This gas vapor condenses in bag house collectors, forming a very fine powder of spherical particles. These particles average 0.1 에게 0.3 직경 미크론, boasting a surface area of 17 에게 30 m2/g.

Physical and Chemical Characteristics of Microsilica

Microsilica is a gray or gray-white powder with a refractoriness of over 1600℃. Its bulk density ranges from 320 에게 700 kg/m3. The chemical composition of microsilica is primarily SiO2, accounting for 75 에게 98% of its content. Other components include Al2O3, Fe2O3, MgO, CaO, and Na2O. The pH value of microsilica is neutral.

The fineness of the silica fume is less than 1μm, 의 평균 입자 크기로 0.1 – 0.3 μm and a specific surface area of 20 – 28 m2/g. This fineness and specific surface area are about 80-100 times that of cement and 50-70 times that of fly ash.

Microsilica in the Refractory Industry

Microsilica has found extensive use in the refractory industry. 무정형 내화물의 성능향상에 중요한 역할을 합니다.. 다음은 그 응용 프로그램 중 일부입니다.:

1. 순정을 대신하는 역할을 합니다. 산화알루미늄 내화물에서.
2. 무정형 및 성형 내화 제품의 생산에 첨가제로 사용됩니다., 강도 및 고온 성능을 크게 향상.
3. 전체 주조 국자에서 응고제로 사용됩니다..
4. 바인더로 사용됩니다, 응고제, 및 기타 내화 제품용 첨가제.

콘크리트의 마이크로실리카

Microsilica powder can fill the spaces between cement particles, making the slurry denser. Its applications in concrete include:

1. Enhancing strength: 첨가 5-10% microsilica can increase the compressive strength by 10-30% and the flexural strength by more than 10%.
2. Increasing density: It can enhance the impermeability by 5-18 times and the chemical resistance by more than 4 타임스.
3. Improving frost resistance: 후에 300-500 rapid freeze-thaw cycles, the relative elastic modulus of microsilica powder decreases by 10-20%, while ordinary concrete decreases to 30-73% ~을 통해 25-50 주기.
4. Providing early strength: Microsilica concrete shortens the induction period and exhibits early strength characteristics.
5. Enhancing anti-abrasion and anti-cavitation resistance: The punching resistance of microsilica concrete improves 0.5-2.5 times compared to ordinary concrete, and its anti-cavitation ability improves 3-16 타임스.

Other Applications of Microsilica

Microsilica is used as a filler in rubber or plastic in the elastomers/polymers industry. It is used in the defluorination process during the production of dicalcium phosphate (animal feed) 비료 산업에서. 석유 및 가스 산업, 흐름을 개선하고 투과성을 줄이기 위해 다운홀 그라우팅 작업에 사용됩니다.. 섬유 시멘트 산업에서, 주름진 지붕 패널의 강도와 투과성을 향상시키는 데 사용됩니다.. 숏크리트에서, 또는 스프레이 콘크리트, 실리카 흄은 리바운드를 줄이고 결합 강도를 증가시킵니다., 생산력, 및 재료비 절감. 성능 향상을 위해 상업용 석고 및 콘크리트 벽판 제품에도 사용됩니다..