Application Fields Of Micro Silica Fume

Application of micro silicon powder in refractories

As a new raw material, micro-silica powder is widely used in the refractory industry. It plays an important role in the improvement of monolithic refractories. The actual application is in the following areas:

1. Replace pure aluminum oxide mud as refractory material.

2. It is used as an additive to produce unshaped and shaped refractory products, which greatly improves its strength and high temperature performance.

3. It is used as the whole pouring and coagulant of the steel drum.

4. Cohesive agent, binding agent, coagulant and additive for other refractory products.

Application of Microsilica Fume in Concrete

Microsilica fume can be well filled in the voids of cement particles after being mixed into cement concrete, making the paste more dense, mainly in:

1. Increased strength: The compressive and flexural strength of concrete is greatly increased. When 5-10% of microsilica is added, the compressive strength can be increased by 10-30%, and the flexural strength can be increased by more than 10%.

2. Increase density: the impermeability is increased by 5-18 times, and the chemical resistance is increased by more than 4 times.

3. Frost resistance: After 300-500 rapid freezing and thawing cycles of micro-silica powder, the relative elastic modulus is reduced by 10-20%, while the relative elastic modulus of ordinary concrete is reduced to 30-73% after 25-50 cycles. .

4. Early strength: Micro-silica fume concrete shortens the induction period and has the characteristics of early strength.

5. Erosion resistance and cavitation erosion resistance: Compared with ordinary concrete, the erosion resistance of microsilica fume concrete is increased by 0.5-2.5 times, and the cavitation erosion resistance is increased by 3-16 times.

Other uses of microsilica

1. Rubber industry: After adding a certain amount of micro silicon powder to the rubber, its extension shrinkage, tear resistance and aging resistance are greatly improved. This rubber also has good dielectric properties and low water absorption.

2. As an anti-caking agent: instead of mica or diatomaceous earth as a raw material to prevent agglomeration of fertilizer particles.

3. Used as a pellet binder: The micro-silica powder has a large surface area and strong adsorption. It has achieved remarkable results as a pellet binder abroad.

4. Water glass industry: It can replace quartz ore to produce water glass with a modulus of 4.

5. Used as cementing in oil fields: Jilin Oilfield, Liaohe Oilfield, Karamay Oilfield, etc., all use a large amount of micro-silica fume and have achieved good results.

6. It is used in insulation materials, waterproof materials, paint, printing industry, etc.

Precautions for micro-silica fume feeding and mixing

1. Generally, the concrete industry uses densification micro-silica fume, so manual feeding or automatic feeding can be selected.

2. Due to the unique ultra-fine characteristics of micro-silica fume, micro-silica fume is required to be put in immediately after the aggregate is added, and powdered micro-silica fume must not be added to the mixed concrete.

3. The mixing time of concrete mixed with micro-silica fume is longer than that of ordinary concrete by 30-40s to obtain good uniformity.

4. There is no special requirement for the transportation of concrete mixed with silica fume, which is the same as ordinary concrete. Note that the transportation time should not exceed 10 minutes.