S95 blast furnace slag grinding technology: A new direction for the construction industry

In recent years, in order to achieve the goal of improving product quality, and at the same time renovating processes and technologies in the direction of being more environmentally friendly, Hoa Phat Group has renovated the system of granulating slag creation by high pressure cold water and invested in an additional blast furnace slag crushing line in Hai Duong Iron and Steel Complex.

This is a vertical, synchronous technology line with the most modern type with a capacity of up to 115 tons / h, equivalent to 750,000 tons / year. This technology line plays a role in the production of blast furnace slag (GBFS – Granulated Blast Furnace Slag) finely ground S95 from solid waste, a by-product of pig iron production in blast furnaces. The new grain slag products not only turn wastes generated during the process of iron smelting into building materials, protect the environment but also bring significant added value to the Group’s steel production chain.

S95 slag is a high quality construction material product with many outstanding advantages. S95 can also be used for concrete piles to handle weak foundations, as materials for ceiling panels, wall panels and sand cement tiles. In particular, this product will help lower the cost of ready-mixed concrete by replacing 30-50% S95 for PC50 and PCB40 cement, because the price of S95 Hoa Phat is lower than the price of cement. With S95, Vietnam can mass produce cement and concrete in seawater, saltwater and brackish water environment, prevent the erosion of chlorine and sulfate, meet the demand of increasing life expectancy for constructions. at sea, on islands and along the coast. Add 30-50% S95 to replace cement will produce low-heat concrete and high-grade concrete used for large concrete blocks, concrete with high compressive strength and high waterproofing.

The process of manufacturing fine-grained blast furnace slag is not too complicated and quite common in many developed countries around the world. After being put into the grinding line, granulated slag to an area greater than 5,000 cm2 / g, meeting the S95 type standard according to TCVN 11586: 2016, finer than cement and becoming a very active mineral additive Good for cement, concrete and mortar.

Thus, Hoa Phat Group has become one of the few leading enterprises to apply S95 material production technology – a material that not only creates added value for the Group but also helps to save costs. solid waste disposal fee. At present, all of the S95 fine steel blast furnace slag products of Hoa Phat Steel have been being produced by many domestic and foreign cement, concrete enterprises, construction contractors and piles association enterprises. Vietnam has registered to buy or be a distributor.

Productivity and Quality Office