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Micro silicon powder, Henån (2026)

26/10/2018

Application of Silica fume in high-tech fieldSilica fume has excellent application prospects in high-tech fields and can be widely used in chemical, metallurgical and other industries. Used in cement or concrete to improve the performance of cement or concrete, and to prepare special concrete or composite cement with super high, high strength, wear resistance, erosion resistance, corrosion resistance, pe*******on resistance, frost resistance and early strength to adapt to oil field solids. Special requirements for wells, offshore oilfield drilling platforms, seaport terminals, railway bridge highways, airport runways, tunnels and urban high-rise buildings; used in rubber to improve the ductility, tear resistance and tensile strength of rubber; Used in refractory materials and ceramic products to effectively improve the strength and durability of the product.

Silica fume concrete is used in water conservancy and hydropower projects, which can improve the anti-abrasion ability of the project. At present, the world's traditional anti-abrasive materials use polymer materials such as epoxy mortar. The anti-abrasive ability of these materials is good, but due to its own line The expansion coefficient is several times higher than that of the base concrete, and it is not well adapted to the temperature of the base concrete. It is easy to crack and fall off under natural climatic conditions, and the construction is complicated, toxic, expensive, and cannot be widely applied. The use of micro-silica powder concrete, the impact resistance is about doubled, and the anti-abrasion ability of the anti-48m/s flow rate is increased by more than 3 times.

Silica fume concrete used in water conservancy projects can improve the crack resistance of engineering hydraulic concrete cracks, which has become a major concern. The reason for the crack is due to the hydration heat of the material itself, such as the incorporation of fly ash into the concrete, although the heating temperature can be lowered, but the early strength is relatively low, so that the amount of fly ash is limited.

Silica fume concrete can improve the resistance to pe*******on and salt corrosion and protect steel bars. In underwater engineering, chloride ions pe*****te into concrete, causing rapid corrosion of steel bars, delamination of concrete, short life and serious destructiveness. Underwater concrete pouring is generally carried out by a duct method. Due to the loss of the cement slurry, it does not bond well with the base layer and reduces the strength of the portion in contact with water. These problems can be significantly improved after the incorporation of microsilica in underwater concrete.

Silica fume concrete is used in the repair of traffic road pavement and has strong wear-resisting characteristics. It takes 28 days to open the road with ordinary concrete. Generally, early-strength concrete should be opened for 3 days, and the concrete road pavement is damaged. It is inevitable. Repairing in the usual way often results in a traffic disruption, which can lead to serious economic losses. The use of Silica fume concrete with early strength and wear resistance is ideal for practical use. The runway of the airport requires more than 80 MPa of concrete and has good wear resistance.

26/10/2018

Due to the small specific gravity of the micro-silica powder pile, the natural dip angle is large, fluffy and easy to fly. It is not easy to carry out the unloading from the container, and the packaging and transportation cost are high. At present, the forms of processing, storage and transportation of micro-silica powder are various in various countries. Generally, they can be packaged in the form of bulk, bead or agglomerate in bulk or in bags, or micro-silica powder and water. Make mud or mud to the user.Bulk is generally transported in sealed cement tankers or dump trucks with caps.

Bags usually weigh 25kg per bag and 30-50kg in large bags. The pockets are usually packed in paper or plastic bags. At present, the micro-silica powders in Shanghai, Tangshan, Taiyuan and other places in China are mostly packed in double-layer plastic bags, each weighing 10-15kg.

In order to improve the transportation efficiency of micro-silica powder, some manufacturers have adopted measures to increase density. For example, factories in Canada, the United States, Sweden, etc. add water to the micro-silica powder tank factory to form a slurry (50% each of water and micro-silica). The mud produced by the Norwegian Lilibi plant contains 35% of microsilica and is shipped directly to the concrete plant. In this way, the transportation cost is low, the loading and unloading is not ash, the working environment is good, and the pumping and mechanization are easy.
Micro-silica powder is used in many ways. Traditional disc-forming machines have been reported in Norway, the Soviet Union, Japan and other countries. Using a papermaking waste liquid, sodium microsilica powder, NaCl, alkali or alkaline earth metal hydroxide or other aqueous solution or water as a binder, the pellets are made of 5-25 mm in diameter, which are generally used as microsilica powder iron raw materials. furnace. The strength of the pellet itself depends on the bonding force of the binder, and some also need to be fired.
In the late 1970s, a Scandinavian company used a high-efficiency alkaline water agent combined with micro-silica to produce a bead admixture for concrete. After 1982, a new development of bead admixtures, Akon, Norway The company uses different alkaline water agents, high-efficiency alkaline water agents and micro-silica powder to bond into different performance bead admixtures for cement, coagulation and other mineral ingredients (including low cement castables, etc.). This is extremely convenient for use as an additive, and can be dissolved and decomposed after being exposed to water, and can have the same effect as the simultaneous incorporation of microsilica powder and high-efficiency alkaline water agent. This technology has also been developed in some countries. The diameter of the beaded microsilica powder is 0.5 mm, and the bulk specific gravity is increased from 0.2 t/m 3 of the original bulk microsilica powder to 0.6 t/m 3 . This will reduce packaging shipping costs by approximately 60%. Increased loading and unloading efficiency, reduced storage space and land occupation, and improved working conditions and environment.
In recent years, the Institute of Building Research of the Ministry of Metallurgy and some units in Shanghai have also done a lot of research on the densification of micro-silica powder. The composite reinforcement agent developed by the Institute of Building Research of the Ministry of Metallurgy passed the technical appraisal in 1987. This admixture is suitable for cement mortar and sim

26/10/2018

What are the uses of silica fume?What is silica fume ?
What is silica fume ? What are the uses of silica fume?Microsilica is also called silica fume or agglomerated silica fume. When the ferroalloy is used to exercise ferrosilicon and industrial silicon (metal silicon), a lot of highly volatile SiO2 and Si gases are generated in the ore furnace, and the gas is discharged and aerated and condensed and deposited with air. It is a by-product of large industrial exercise. The whole process needs to be recovered by dust removal and environmental protection equipment. Because of the lighter quality, it needs to be encrypted with encryption equipment.Silica fume range:unshaped refractory materials, dry mixed (premixed) mortar, high strength non-shrinkage grouting, wear-resistant industrial flooring, repair mortar, polymer mortar, thermal insulation mortar, impermeability,compacting agent, bismuth preservative, cement-based polymer waterproofing agent; rubber, plastic, unsaturated polyester, paint, coating and other polymer materials, ceramics modification.
Application area:
Used in mortar and concrete: high-rise buildings, seaports, reservoir dams, water conservancy, culverts, railways, highways, bridges, subways, tunnels, airport runways, sloping roads, and bolting and blasting reinforcement in coal mine roadways.
In the data industry:High-grade high-function low-carbon refractory castables and prefabricated parts, the service life is three times that of general castables, the refractoriness is improved by about 100 °C, and the high temperature strength and thermal shock resistance are significantly improved. It has been used in many industries such as coke oven, iron making, steel making, steel rolling, non-ferrous metals, glass, ceramics and power generation. Large iron trenches and steel-clad materials, permeable bricks, modified repair materials, etc. Self-flowing refractory pouring materials and dry-wet method eruption construction applications. Oxide-bonded silicon carbide products (ceramic kiln furniture, flame barriers, etc.). High-temperature type calcium silicate lightweight insulation materials.The electric porcelain kiln is driven by corundum mullite. High temperature wear-resistant materials and products. Corundum and ceramic products.Sailong combined products. In addition to the use of cast-type refractory materials, there are many applications in fused and sintered refractory materials.New wall materials and veneer materials Polymer mortar, thermal insulation mortar and interface agent for wall insulation.Waterproof materials for cement-based polymers. Lightweight aggregate insulation and energy saving products and products. The inner and outer wall construction is processed with putty powder.
Other uses: silicate brick material.Producing water glass.Used as a reinforcing material for organic compounds. It is near the white carbon black produced by its composition and gas phase method. It can be used as a filling and reinforcing material in polymer materials such as rubber, resin, paint, paint, and unsaturated polyester.

11/10/2018

Microsilica
Volatilized silica
There are several materials that are physically and chemically quite similar to
silica fume. These materials may or may not be by-products. Some of these
materials may perform well in concrete; however, their cost usually prohibitsoo such use.
Silica fume is a by-product of producing silicon metal or ferrosilicon alloys in
smelters using electric arc furnaces. These metals are used in many industrial
applications to include aluminum and steel production, computer chip fabrica
tion, and production of silicones, which are widely used in lubricants and
sealants. While these are very valuable materials, the by-product silica fume is of more importance to the concrete industry.

shows a smelter in the days before silica fume was being captured for use in concrete and other applications. The“smoke” leaving the plantis actually silica fume. Today in the United States no silica fume is allowed to escape to the atmosphere. The silica fume is collected in very large filters in the baghouse and then made available for use in concrete directly or after additional processing as is described The primary chemical properties of silica fume are shown in. Following is a discussion of each of these properties. Note that the major chemical properties are included in the standard specifications for silica fume as discussed in the following

11/10/2018

Silica fume Amorphous. This term simply means that silica fume is not a crystalline
material. A crystalline material will not dissolve in concrete, which must occur before the material can react. Don't forget that there is a crystalline material in concrete that is chemically similar to silica fume. That material is sand.
While sand is essentially silicon dioxide (SiO2), it does not react because of its crystalline nature.
Silicon dioxide (Si0,). This is the reactive material in silica fume. How silica fume reacts in concrete Trace elements. There may be additional materials in the silica fume based upon the metal being produced in the smelter from which the fume was recovered. Usually, these materials have no impact on the performance of silica fume in concrete. Standard specifeations may put limits on some of the materials in this category as is discussed in the following
The primary chemical properties of silica fume are shown in B. PDFKR/eF Following is a discussion of each of these properties. Note that the major chemical properties are included in the standard specifications for silica fume

SILICA FUME AND FRESH CONCRETE ,
In addition to the improvements in durability, the lack of bleeding allows a more efficient fnishing process to be used with silica-fume concrete flatwork.
conventional concrete, it is critical not to conduct finishing operations until all bleeding has stopped and all bleed water has evaporated from the surface. Thus, there is usually a several hour waiting period after the initial placing and finish- ing operations. Once bleed water has disappeared and the concrete has gained sufficient strength, final finishing is started. With silica-fume concrete showing no bleeding, the finishing operation can be continuous from placement to texturing and curing. This approach is called one-pass or fast- track finishing and is particularly advantageous in structures where silica fume is likely to be specifed for durability such as bridge decks or parking structures. Figure 3.4 shows onc-pass finishing of silica-fume concrete in a parking structure. Unless a special finish is required, it is not unusual for finishing of silica-fume concrete to be completed within a halfhour of the concrete arriving on the deck.

11/10/2018

Silica fume gained inital attention in the concrete market place because of its
ability to produce concrete with very high compressive strength. Improvements
in other mechanical propertics such as modulus of clasticity or flecural strength are also seen.

Although concrete has been specified to take advantage of improvements in these other properties, the property of most interest is certainly compressive
Strength shows the cffcts on compressive strength of using different amounts of ccment, ily ash, silica furne, and water in concrete.The curves that are shown are typical of what may be expected. There are several important paints in this figure:The increase in strength is proportional at all ages. Thus, the ratio of 3-day or 7-day strength to 28-day strength is reasonably consistcnt, regardless of the 28-day strength achicved.

This ratio will be about the same for concrete with silica furne as for concrete without - the 3-day strength will be about 50% and the 7-day strcngth will be about70% of the 28-day strength Adding more silica fume will usuallyincrease strength. However, the effccts of water content, fly ash content and type, if used, and silica fume all interact to determine the compressive strength and the rate of compressive strength development.Silica fume has most of its impact on compressive strength by about28 days While the concrete will usually continuctto gain strength aftcr 28 days, the rate of strength gain will be much slower. This strength gain curve is very different from an AS TM C 618 Class Fly ash, which is also a purely pozzolanic matcrial.The results presented are from differentprojccts using different materials You must test any proposed mixture proportions using your project specfic materials.

14/09/2018

Cohesive: It is not easy to isolate and stratify during the transportation and construction of concrete, and it has good adhesion to rock, old concrete, brick and other materials, and it has small rebound amount for shotcrete engineering. When the amount of micro-silica containing powder is 20-30%, the viscosity is good and can be used for underwater engineering construction. It is not easy to produce shrinkage cracks, the concrete surface is smooth, and the micro-silica powder concrete should be cured early.

14/09/2018

Some micro-silica powder recovered from ferroalloy plants in Norway, Iceland, Canada and other countries have been reported as cement raw materials. Its application method is as follows:
For cement material ingredients, the Soviet patent states that 18-25% of micro-silica powder is added to the raw material for producing Portland, which can increase the output of cement kiln and the quality of cement. The capacity of kiln is increased by 10-20%; cement health After 28 days, it was increased from 47Pa to 54-56Mpa.
Production of mixed cement: Icelandic cement company will make spherical micro-silica powder and clinker together to produce mixed cement containing about 6% of micro-silica powder. The application effect is very good. In 1982, Lafarge Cement Company of Canada used microsilica powder mixed with Portland cement to produce mixed cement. Canada has developed a specification for mixed cement. The mixed cement requires micro-silica powder to be incorporated within 10%, the micro-silica powder has a SiO2 content greater than 85%, and the loss on ignition is

12/09/2018

silica fume equipment

12/09/2018

What should be paid attention to when mixing silica fume in concrete

Although silica fume can improve the performance of fresh and hardened concrete, if it is used improperly, it will cause quality accidents. Therefore, pay attention to the following matters during use:

* Since the silica fume particles are fine, the specific surface area is large, and the water demand is high, when the concrete is mixed with silica fume, it must be used in combination with the superplasticizer to achieve good results.
* There are two methods for incorporating silica fume into concrete: internal mixing method and external mixing method. Since the internal mixing method is to reduce the amount of cement, this method is generally used in medium and low strength grades of concrete; the external infiltration method does not reduce the amount of cement and is generally used in high strength grade concrete.
*The amount of silica fume in concrete should not be too high or too low, and the general dosage is 5% to 10%. In this range, the beneficial effect of silica fume is best, that is, not only the best effect of silica fume instead of cement Various excellent properties are fully exerted, and adverse effects can be avoided, such as a decrease in the frost resistance of concrete after the amount is more than 15%.
* Due to the high consistency of the silica fume concrete, it should be 2 to 3 cm larger than the ordinary concrete when designing the concrete slump.
*The mixing time of silica fume concrete should be 0.5~1min longer than that of ordinary concrete, so that the concrete can be more evenly mixed to prevent the silt ash from forming a mass in the concrete and causing quality accidents.
*After the concrete is mixed with silica fume, it is necessary to strengthen the early curing to prevent plastic shrinkage cracks in the concrete.

Micro silicon powder

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