Water slag is formed by rapidly cooling the blast furnace slag in the hot-melt steel-making high-frequency furnace in water. There are mainly two ways: slag pool water quenching or furnace front water quenching. Because of its potential hydraulic cementitious properties, water slag can be used as building materials for the production of cement and concrete. Under the action of cement clinker, lime, gypsum and other activators, it can be used as high-quality cement raw materials and can be made into: slag Portland cement, gypsum slag cement, lime slag cement, slag brick, slag concrete, etc.
Water slag iron (particle) is a kind of particle with high iron content by crushing and magnetic separation. Its production process is as follows: the water slag block generated by water quenching of blast furnace slag in the high-frequency furnace of the steel plant is sent to the cement plant for crushing with hxlm5000 (model of crusher) raw material vertical mill powder concentrator, the water slag iron block is crushed to 1 ~ 3mm particles, and the crushed particles are magnetically separated on the large dry magnetic separator 8240 (model of magnetic separation machine), Obtain water slag iron pellets (particles) that meet the production requirements. For the production of EPC iron castings by direct ironmaking with water slag iron, the existing technology only involves the water slag iron particle separation device and the water slag iron recovery device, which is mainly used for on-line separation of small iron particles in the water slag products of blast furnace water slag washing process; For the production of iron castings by direct ironmaking with water slag iron, at present, it only involves the process of direct casting of scrap iron; However, there is no research on the production process analysis of direct casting in water slag iron smelting.
In the existing production, most of the gray iron castings are produced by purchasing the prepared gray iron raw materials, so the production cost is relatively high (3000 ~ 3500 yuan per ton of gray iron raw materials); Moreover, in the process of using water slag iron to produce iron castings, after the water slag iron particles are heated in the medium frequency furnace to reach the melting temperature, the water slag iron particles will not melt, but will agglomerate into blocks. Continue to increase the melting temperature of the medium frequency furnace, and the water slag iron blocks will not melt with the increase of temperature, resulting in great difficulty in directly using water slag iron to produce iron castings. At present, there is no molding treatment method in the production technology.
The direct casting of water slag iron (the market price of water slag iron particles is 1700 ~ 1950 yuan per ton). After the standard gray iron material is melted into molten iron, a certain proportion of water slag iron particles are added to the molten iron, so that the water slag iron particles can be completely melted into molten iron, and then the purification modifier is added to the molten iron to directly produce gray iron castings, It can effectively reduce the production cost (the price of raw materials can be reduced by 1000 ~ 1500 yuan per ton) and improve the yield. The specific production methods are introduced in detail.