Method for increasing silicon outside molten iron furnace and method for producing foundry pig iron by increasing silicon outside molten iron furnace

Abstract

The invention provides a molten iron outer-furnace silicon adding method. The method comprises a step of adding a silicon adding agent in outer-furnace flowing molten iron, and a step of setting a silicon adding agent fluxing part on a flowing molten iron groove, wherein the silicon adding agent fluxing part accelerates melting of the silicon adding agent through stopping the flowing speed of the silicon adding agent. The invention further provides a method for producing foundry casting pig iron through molten iron outer-furnace silicon adding; and the method comprises a step of adding the silicon adding agent in the outer-furnace flowing molten iron, a step of setting the silicon adding agent fluxing part on the the flowing molten iron groove, and a step of leading the flowing molten iron, added with the silicon adding agent, into a ladle to cast the foundry pig iron, wherein the silicon adding agent fluxing part accelerates melting of the silicon adding agent through stopping the flowing speed of the silicon adding agent. As the silicon adding agent fluxing part is arranged on the flowing molten iron groove, the improvement of the silicon adding efficiency of the silicon adding agent is realized, the mode is simple, the effect is excellent, the popularization and the application are easy, and the silicon adding efficiency of a traditional silicon adding agent can be improved.

Description

technical field [0001] The invention relates to a method for increasing silicon outside a molten iron furnace and a method for producing casting pig iron by increasing silicon outside a molten iron furnace, and belongs to the technical field of silicon increasing for molten iron. Background technique [0002] The pig iron produced by blast furnace smelting is divided into steelmaking pig iron and foundry pig iron. Blast furnace smelting steelmaking pig iron can obtain a higher utilization factor and lower energy consumption; It is easier to smelt than large blast furnaces, but small blast furnaces have serious environmental pollution. Since the country promulgated the "National Iron and Steel Industry Policy" in 2005, the high-speed rail industry has gradually phased out small blast furnaces, towards 450m 3 or 1000m 3 The development of the above blast furnace, however, the utilization coefficient of smelting and casting pig iron in the blast furnace is low, and the energy ...

AI Technical Summary

Problems solved by technology

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the technical defect that the method of increasing silicon outside the molten iron furnace in the prior art cannot achieve higher silicon increasing efficiency with simple control means, thereby providing a method for increasing silicon increasing efficiency with convenient control means. Efficient way to add silicon outside the molten iron furnace

[0006] Another technical problem to be solved by the present invention is to overcome the technical defect that the method of increasing silicon outside the molten iron furnace in the prior art cannot use simple control means to achieve higher silicon increasing efficiency, thereby providing a method of increasing silicon increasing efficiency with convenient control means. Efficient method for producing foundry pig iron by adding silicon outside the molten iron furnace