High Purity Silicon Carbide Powder

 

Silicon powder is a by-product during the smelting of ferrosilicon alloy or industrial silicon. It is obtained by oxidizing the silicon steam discharged from the flue and cold collecting dust. Silica powder has the best performance among all admixtures, and is also the most expensive. Generally only used in high-strength, high-durability concrete.

Silicon (Metal) Powder

 

Silica powder is mainly supplied in two forms, namely original silicon powder and densified silicon powder.

1. Raw silicon powder, that is, the product collected directly through a dust collector, has a loose volume of about 150-200kg/m3. Raw silicon powder is generally transported in bags. Due to its small density, long-distance transportation efficiency is low, so use Often people use manual methods to directly break the bags and pour the silica powder into the concrete mixer. The working environment is dusty and the work efficiency is low.

 

2. Densified silicon powder. In order to solve the problem that raw silicon powder is not suitable for long-distance transportation and has low efficiency, "micro-silicon density technology" has been developed to improve the looseness and density of silicon powder. This technology makes the original silicon powder roll and aggregate into small particle clusters under the action of compressed air flow, thereby increasing the loose volume of silicon powder to 500-700kg/m3, which greatly facilitates use and densifies the small particles of silicon powder. The particle cohesion of the aggregate is weak, and it is very easy to disperse during the mixing process in the concrete mixer. Therefore, the silicon powder particles can be put into the mixer after the aggregate is fed to ensure that the dense micro-silica particle aggregates are dispersed and well dispersed.

 

 

Silica fume is added to concrete to increase the density of concrete, increase its strength, and improve its anti-permeability and anti-wear properties. Methods for incorporating silica fume: There are generally two methods for adding silica fume into concrete: one is internal mixing, and the other is external mixing, both of which are used in conjunction with water-reducing agents.

 

High Quality Silicon Metal Powder

 

The internal mixing method often uses silica fume to replace cement, which can be divided into two types: equal quantity replacement and partial equal quantity replacement. Equal quantity replacement means that the silica fume content replaces equal amounts of cement, and partial substitution means that 1kg of silica fume replaces 1 to 3kg of cement. As a research The general dosage is 5% to 30%, and the water-cement ratio generally remains unchanged: the external mixing method refers to the silica powder being mixed into concrete like an admixture, without reducing the cement dosage, and the dosage is generally 5% to 10 %, generally the mechanical properties of concrete obtained by the external mixing method are much higher, but the amount of cementitious materials in the concrete is increased.

 

 

 

Silicon metal powder for refractory	Size(mesh)	Chemical Comoositions(%)
		Si	Fe	Al	Ca
		Min	Max
	150 mesh	99	0.4	0.2	0.1
	200 mesh	98.8	0.4	0.4	0.1
	325 mesh	98.5	0.5	0.3	0.2
	400 mesh	98	0.6	0.4	0.3
	600mesh	97	0.8	0.7	0.6

 

silicon powder	Size (mesh)	Chemical Composition %
		Si	Fe	Al	Ca
		≥	≤
for chemical use	Si-(20-100 mesh)	99.6	0.2	0.15	0.05
	Si-(30-120 mesh)
	Si-(40-160 mesh)	99.2	0.4	0.2	0.1
	Si-(100-200 mesh)	99	0.4	0.4	0.2
	Si-(45-325 mesh)	98.5	0.5	0.5	0.3
	Si-(50-500 mesh)	98	0.6	0.5	0.3

 

 

Silicon Metal Powder 98.5% 200 Mesh

 

 

Silicon Metal Powder 200 Mesh

 

 

Silica fume concrete is used in water conservancy and hydropower projects to improve the abrasion resistance of the project. Traditional anti-abrasion materials at home and abroad mostly use polymer materials such as epoxy mortar. Although this type of material has good abrasion resistance, its linear expansion coefficient It is several times larger than the ordinary concrete of the base. It does not adapt well to the temperature of the base concrete. It is easy to crack and fall off under natural climate conditions. The construction is complex, toxic and expensive, so it cannot be promoted and applied in large areas. By using silica fume concrete, the erosion resistance is increased by about 1 times, and the erosion resistance at the 48m/s flow rate level is increased by more than 3 times.

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