Smelting synthetic slag and production method thereof

Abstract

The invention belongs to a steel smelting synthetic slag refining technology, and especially relates to a smelting synthetic slag and a production method thereof. The smelting synthetic slag is characterized by comprising the following components in percentage by weight: 61% of CaO, 20% of Al2O3, less than or equal to 3% of SiO2, less than or equal to 1% of Fe2O3, less than or equal to 1% of MgO, less than or equal to 0.03% of P, less than or equal to 0.01% of S, less than or equal to 2.5% of CaF2 and less than or equal to 10% of water. The production method is characterized by comprising the following steps of: grinding 61 kg of CaO and 20 kg of Al2O3 into powder, adding 10 kg of water, 3 kg of SiO2, 1 kg of Fe2O3 and 1 kg of MgO, and pelletizing the mixture into granules with 50 mm particle size; and firing the granules at high temperature of 1300-1500 DEG C for 3 h in a furnace. The sintered smelting synthetic slag provided by the invention is not easy to crush and pulverize and has the advantages of less dust, good flowability, small material loss, quick melting, good effect, environmental protection, low energy consumption and low production cost.

Description

technical field [0001] The invention belongs to a refining technology of iron and steel smelting synthetic slag, in particular to a smelting synthetic slag and a production method thereof. Background technique [0002] At present, ladle refining has become a process in modern steel production. In the process of ladle refining, since the synthetic slag refining technology can reduce the content of oxygen, sulfur and inclusions in steel, it has been widely used. In the production of traditional ladle refining furnaces, synthetic slag is usually divided into three types: mixed type, press-formed and pre-melted type. The mixed type is made by mixing various raw materials according to the ratio. During transportation and storage, it is easily broken and pulverized. Therefore, the dust in the process of use is large, the material loss is large, the melting is slow, and the environmental pollution is serious; the pressed molding is A high-pressure molding machine is used to press ...

AI Technical Summary

Problems solved by technology

The mixed type is made by mixing various raw materials according to the ratio. During transportation and storage, it is very easy to be broken and powdered. Therefore, the dust is large during use, the material loss is large, the melting is slow, and the environmental pollution is serious; the pressed molding is A high-pressure molding machine is used to press into balls. Although the balls have high strength, uniform particle size and high ball forming rate, there is a problem of pellet powdering, and the investment in equipment is large; After weighing and mixing, it is melted at high temperature and then cooled. Although there is no crushing and pulverization in the process of transportation and storage, it consumes more energy and has higher production costs.