Slag wool is a kind of mineral wool.Short fiber made from iron and steel blast furnace slag.The commonly used raw materials are iron, phosphorus, nickel, lead, chromium, copper, manganese, zinc, titanium and other slags.Mainly used asMasonry materialsandSound absorbing material。Iron packaging materials can also be used.Slag wool is a kind of industrial waste slag（Blast furnace slagOr copper slag, aluminum slag, etc.) as the main raw material, which is made by melting, high-speed centrifugation or injectionInorganic fiber。It has the characteristics of light weight, small thermal conductivity, non combustion, moth resistance, low price, corrosion resistance, good chemical stability, sound absorption, etc.It can be used for filling and heat insulation, sound absorption, sound insulation of buildings, cold insulation of oxygen generators and cold storages, and filling and heat insulation of various thermal equipment.
Slag wool as industrial wasteBlast furnace slagMineral wool made from main raw materials.Its main components (%) are: SiOtwo36～39，AltwoOthree10～14，FetwoOthree0.6～1.2，CaO 38～42，MgO 6～10，S<0.7。Thermal conductivity 0.036~0.05W/(m · K);Slag ball content: 3%~10%;The melting temperature is 800 ℃.When the iron content or magnesium content is too high and the slag ball content is too high, it is necessary to add an appropriate amount of rock or industrial waste to reduce the surface tension of the melt, so as to reduce the content of slag ball and expand the use temperature range of fiber.Remove the slag in the granulator to make particles with a particle size of 10~15mm, called granulated wool, which can be used as filling or spraying materials, and can also be made into plates. The purpose is the same as mineral wool, which is more convenient for construction.
The main technical properties of slag wool are: the apparent density is 77kg/mthreeThe thermal conductivity (normal temperature) is about 0.041W/(m · K), and the service temperature is 650 ℃.
On October 27, 2017,world health organizationThe list of carcinogens published by the International Agency for Research on Cancer has been preliminarily sorted out for reference. Slag wool is included in the list of three types of carcinogens (carcinogenicity to humans has not been classified yet).[1]
characteristic
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Slag cotton uses blast furnace, ferromanganese slag and ferronickel slag as raw materials;Rock wool uses basalt, peridotite and other natural rocks as raw materials;Glass fiber uses quartz sand as raw material;Ceramic fiber uses synthetic bauxite and silica as raw materials.
Slag cotton fiber
Rock woolSlag wool is inorganic fiber type thermal insulationSound absorbing material。They have the characteristics of low density, low thermal conductivity, incombustible and sound absorption.Moreover, it has certain elasticity and softness, and is suitable for filling materials of various shapes of thermal insulation and sound absorption projects. Rock wool and slag wool can also be further processed into various shapes of special-shaped thermal insulation, cold insulation, heat insulation and sound absorption products, which makes the application and construction easier.Rock wool also has a large acidity coefficient, so it is less corrosive to metal, and is more suitable for heat preservation and insulation works of metal furnaces and pipelines.
Thermal insulation materialThe quality of is usually measured by several indicators, such as unit weight, thermal conductivity, service temperature, product price, and thermal insulation capacity.The bulk density and thermal conductivity of glass wool and foam plastic are low, but there are problems such as low service temperature, high cost, and poor safety and fire resistance.Mineral wool products have the highest cost performance when measured by their thermal insulation capacity and safety.[2]
classification
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Photos of slag wool
Add other mineral wool with special physical propertiesan adhesive, can be made into various slag woolproducts, mainly includingGranular cotton、Mineral wool asphalt felt、Mineral wool semi hard board、Mineral wool insulation pipe、Mineral wool semi hard board seam felt、Mineral wool insulation belt、Mineral wool sound-absorbing beltas well asMineral wool decorative sound-absorbing boardEtc.
Mineral wool decorative sound-absorbing board is based onMineral woolIt is the main raw material.
Add proper amount of adhesiveMoisture-proof agent，preservative, pressure drying.It has the characteristics of sound absorption, light weight, fire prevention, heat insulation and construction assembly.Sound-absorbing boardThe internal structure, finish, perforation and embossing of the high and medium frequency sound have good absorption effect.
If you press certainPerforation ratePerforating can become a kind ofLow-frequency noiseGood absorptiveLow frequency resonanceSound absorption structure.
Wangxing mineral woolUse andGlass woolThe decorative sound-absorbing panels are the same.Thermal insulationSound absorptionThe effect is better than glass wool.
constitute
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Rock wool takes basalt (or diabase) and limestone as the main raw materials (and a small amount of slag), and adds coke (the weight ratio of coke to other raw materials is generally 1:3-4).
Rock woolThe production process of slag wool includes injection method, centrifugal method and pendulum method.At present, however, centrifugation is the most widely used method, which is introduced as follows.
Slag wool takes slag and limestone as the main raw materials and adds coke (the weight ratio of coke to other raw materials is generally 3.3~4.1).
Slag wool
The production process of rock wool and slag wool is to load the raw materials into the furnace in a certain proportion, and melt the raw materials after a high temperature of 1360~1400 ℃ (the temperature of rock wool is higher, generally 1500 ℃. The temperature of slag wool is lower). The molten liquid will gradually, evenly and continuously fall on the high-speed rotating roller of the centrifuge from the outlet,Under the action of huge centrifugal force, it is thrown into a fiber with a diameter of less than 7 μ m.At the same time of fiber forming, spray mist like dust-proof oil (to soften the fiber so as not to irritate the skin during use) and water-soluble thermosetting phenolic resin as binder on the fiber.Then the fibers are settled in the cotton collecting chamber by air selection, and the fibers are evenly distributed on the conveyor belt and output through the negative pressure provided by the cotton collecting chamber.
The production methods of rock wool and slag wool can be divided into three categories, namely, blowing method, centrifugal method and centrifugal blowing method.
When slag cotton quilt is used as filler for burglar proof door, its comprehensive performance is better than that of honeycomb paper and foaming agent.[2]
Production process
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Slag wool is a kind of white cotton which is made from slag as the main raw material and is melted in the melting furnace to obtain the molten product, and then further processedMineral fibreIt has thermal insulation, sound insulation and other properties.There are two main methods to produce slag wool: injection method and centrifugal method.The method of using steam or compressed air to blow the raw materials into slag wool after melting in the furnace is called blowing method;The method that raw materials fall on the rotating disc after melting in the furnace and are spun into slag wool by centrifugal force is called centrifugal method.The main raw material for producing slag wool is blast furnace slag, accounting for 80%~90%, and the fuel iscoke。The process flow of slag wool production is shown in the figure.[3]
Technological process of slag wool production by injection method
Using blast furnace slag, ferromanganese, ferronickel and other slag as raw materials for slag wool can significantly reduce production energy consumption and cost, improve the environment, and have good economic benefits.Statistics show that every 1t mineral wool thermal insulation products used in buildings can save 1t of oil a year.Coal saving rate per unit area is 11.91kg-standard coal/m per yeartwo。With the deepening of energy conservation and emission reduction in China, mineral wool products and their applications are facing huge development opportunities.In the past 20 years, energy supply has become increasingly tight, and building energy conservation, fire prevention, sound insulation and noise reduction have become the focus of attention. Mineral wool products asNew building materialsIt is widely used in the construction field.
Slag wool is usually made by separating slag fluid with a high-speed rotating four roller centrifuge and blowing with high-speed air or steam flow.Slag wool contains high content ofAlkaline oxideCaO will reduce the melting temperature of slag, which is easy to generate fibers during blowing.
Containing high CaOInorganic fiberDue to poor heat resistance, CaO in silicate will also react with alkali or water to dissolve.When the fiber is used for non solution culture and solution culture in agriculture, the pH value will rise due to the water in contact with the fiber, which will affect the growth of plants.On the other hand, when the raw materials used in the production of inorganic fibers do not contain CaO, their melting point is quite high, which makes fiber production more difficult and increases production costs.But when the ferroalloy slag with low CaO content is used to produce slag wool fiber, the production of slag wool is relatively easy and the cost is very low.[2]
purpose
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Inorganic fiber materials such as slag wool, rock wool, glass fiber and ceramic fiber have excellent properties such as light weight, low thermal conductivity, fire prevention, corrosion resistance, good chemical stability and sound absorption, and are increasingly used in various industrial fields.Slag wool is short fiber mineral wool made from slag, mainly used for heat insulationThermal insulation materialAnd sound-absorbing materials.The permeability and water retention properties of slag cotton products extend their application to agriculture.
Mineral wool products are mainly used for thermal insulation of industrial heat pipe network, industrial furnaces, ships and other transportation vehicles.In the construction industry, mineral wool products are commonly used in the external thermal insulation maintenance structure of buildings, sound insulation filler materials for partition walls inside buildings, and sound absorption materials for suspended ceilings inside buildings.[2]
