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2022
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04
What is the purpose of blast furnace slag in iron and steel plants?
Author:
The main uses of blast furnace slag are as follows: (1) Production of slag cement. Water slag has potential hydraulic cementation properties, and can show hydraulic cementation properties under the action of cement clinker, lime, gypsum and other activators, and is a high-quality cement raw material. Water slag can be used as cement mixture, and geological drill pipe can also be made into clinker-free cement. ①Slag Portland cement, how to install the special drill bit for Huainan Fengtai County Coal Mine is to use Portland cement clinker and water slag and add 3% to 5% gypsum to mix and grind, or grind separately and then mix uniform and made. Slag Portland cement is referred to as slag cement. When grinding slag cement, the mixing amount of blast furnace slag has little effect on the compressive strength of cement, but has less effect on the tensile strength, so the mixing amount can be added to 20% to 85% of the weight of the cement. In this way, it is very beneficial to improve the quality of cement and reduce the cost of cement production. ②Gypsum slag cement is a kind of hydraulic cementitious material obtained by mixing dry water slag, gypsum, Portland cement clinker or lime according to a certain proportion or grinding separately and then mixing evenly. When preparing gypsum slag cement, blast furnace water slag of geological drill pipe is the main raw material, and the general dosage can be as high as about 80%. The gypsum slag cement has low cost, good sulfate corrosion resistance and permeability resistance, and is suitable for concrete hydraulic structures and various prefabricated blocks. ③Lime slag cement is a kind of hydraulic cementitious material obtained by grinding dry water slag, quicklime or slaked lime and natural gypsum below 5% in an appropriate proportion. The amount of lime added is generally 10% to 30%, and its function is to stimulate the active components in the water slag to generate calcium aluminate hydrate and calcium silicate hydrate. If the amount of lime added is too small, the active ingredients in the water slag will be difficult to fully stimulate; if the amount of lime mixed is too large, the geological drill pipe will cause the cement to set abnormally and the strength will decrease. Lime slag cement can be used for various concrete preforms for steam curing, unreinforced concrete and industrial and civil construction mortar in water, underground, pavement, etc. (2) Production of slag bricks and wet-rolled slag concrete products ①Slag bricks, which are made by adding a certain amount of cement and other cementitious materials with water slag, after stirring, forming and steam curing are called slag bricks. Use 87%~92% water slag, 5%~8% cement, add 3%~5% water to mix The strength of the brick produced by the tooth drill bit - the air drill bit - the iron hole drill bit - Yanggu Jinxing Mining Tools Co., Ltd. can reach about 10MPa, which can be used in ordinary house construction and underground construction. In addition, grinding blast furnace slag into slag powder, adding 40% slag powder and 60% water slag by weight, adding water to mix and forming, and then autoclaving for 6 hours under the steam pressure of 100-110MPa, the compressive strength can also be obtained. higher bricks. ②Wet-milled slag concrete is a kind of concrete made of water slag as the main raw material. Its manufacturing method is to put water slag and activator (cement, lime and gypsum) on a wheel mill and add water to make mortar, and then mix it with coarse aggregate. The various physical and mechanical properties of wet-milled slag concrete, such as tensile strength, elastic modulus, fatigue resistance and bonding force of steel bars, are similar to those of ordinary concrete. Its main advantage is that it has good water penetration resistance, and can be made into waterproof concrete with good water impermeability; it has good heat resistance, and can be used in thermal engineering with working temperature below 600 °C. into concrete with a strength of 50MPa. This kind of concrete is suitable for the production of concrete components in small concrete precast plants, but it is not suitable for pouring on the construction site. (3) Used for thermal insulation packing. It can be used as a thermal insulation filler instead of silica bath clay, which saves costs. (4) Production of slag powder. The blast furnace water slag can be used as the main raw material for the production of slag powder after ultra-fine grinding.
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