What's the Microsilica Fume Production Process?

What's the Microsilica Fume Production Process?

1. What is microsilica fume? .

Microsilica fume, also called silica fume or condensed silica fume, is a byproduct of the production of silicon metal or ferrosilicon alloys. It is an ultra-fine powder with high pozzolanic activity, which means that it reacts with calcium hydroxide in the presence of water to create more durable and stronger concrete.

2. What is the production process of microsilica fume? .

The production of microsilica fume is similar to the production of silicon metal or ferrosilicon alloys. The process begins by heating a mixture of quartzite rock and carbon in a submerged electric arc furnace. The heat generated by the arc melts the quartzite and carbon, creating silicon metal or ferrosilicon alloys and releasing a vapor of silicon dioxide (SiO2).

3. How is microsilica fume collected and processed? .

The vapor of silicon dioxide generated during the production process is collected and condensed into a fine powder known as microsilica fume. The powder is then processed in a variety of ways to remove impurities, control the particle size distribution, and enhance its pozzolanic activity. The most common methods of processing microsilica fume include milling, grinding, and air classification.

4. What are the benefits of using microsilica fume in concrete? .

Microsilica fume has several benefits when used in concrete, including:

- Increased strength: The pozzolanic reaction between microsilica fume and calcium hydroxide creates additional calcium silicate hydrate (C-S-H) gel, which improves the strength and durability of the concrete.

- Reduced permeability: The small particle size of microsilica fume helps to fill the pores in the concrete, reducing its permeability and improving its resistance to water and chemicals.

- Improved workability: Microsilica fume can improve the workability of concrete by reducing the water content required for a given slump and increasing the plasticity of the mix.

- Reduced bleeding and segregation: Microsilica fume can help to reduce bleeding and segregation in fresh concrete, resulting in a more uniform mixture.

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