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What is micro silicon powder and its function and scope of application


Microsilica is also called silica fume or agglomerated silica fume. English is Microsilica or Silica fume. When ferroalloy is used to smelt ferrosilicon and industrial silicon (metal silicon), a large amount of highly volatile SiO2 and Si gas is produced in the ore furnace, and the gas is quickly oxidized and condensed and precipitated after being discharged. Micro-silica powder is a by-product of large-scale industrial smelting. The whole process needs to be recycled with dust-removing environmental protection equipment. Because the quality is relatively light, encryption equipment is needed for encryption.

First, the role of micro silicon powder:

The microsilica powder can fill the pores between the cement particles, and simultaneously form a gel with the hydration product, and react with the alkaline material magnesia to form a gel. In cement-based concrete, mortar and refractory castables, the addition of an appropriate amount of silica fume can play the following roles:

1. Significantly improve pressure resistance, flexural resistance, impermeability, corrosion resistance, impact resistance and wear resistance.

2. It has the functions of retaining water, preventing segregation, bleeding, and greatly reducing the pumping resistance.

3. Significantly extend the service life of the crucible. Especially in harsh environments such as chloride salt pollution, sulfate attack, and high humidity, the durability of concrete can be doubled or even multiplied.

4. Greatly reduce the falling ash of the spray raft and the castable, and increase the thickness of the single spray layer.

5, is a necessary component of high-strength, has C15砼 engineering applications.

6. It has the effect of about 5 times of cement. It can be used in common concrete and low cement castables to reduce cost and improve durability.

7. Effectively prevent the occurrence of strontium aggregate reaction.

8. Improve the compactness of the cast refractory. When coexisting with Al2O3, it is easier to form a mullite phase, which has high temperature strength and enhanced thermal shock resistance.

Second, the scope of application of micro-silica:

Micro-silica powder is suitable for commercial crucible, high-strength crucible, self-leveling crucible, unshaped refractory, dry-mixed (premixed) mortar, high-strength non-shrinkage grout, wear-resistant industrial floor, repair mortar, polymer mortar, heat preservation Mortar, anti-seepage, tamping agent, antimony preservative, cement-based polymer waterproofing agent; reinforcement of rubber, plastic, unsaturated polyester, paint, coating and other polymer materials, modification of ceramic products, etc. .

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