Method for producing foundry pig iron from pig iron for steel manufacture by virtue of silicon pickup outside furnace

Abstract

The invention discloses a method for producing foundry pig iron from pig iron for steel manufacture by virtue of silicon pickup outside a furnace. The method is mainly used for realizing efficient flow division and gain of blast furnace surplus molten iron in a long-process iron and steel enterprise; after the tapping of the pig iron for steel manufacture produced by a blast furnace, the components of the pig iron for steel manufacture are regulated to the components of the target foundry pig iron by virtue of silicon pickup outside the furnace, and then the target foundry pig iron is transported to a pig-casting machine for casting into pieces, wherein the silicon pickup outside the furnace is realized by adding a silicon adding agent in a steelmaking KR desulfurization step or adding the silicon adding agent to an iron runner by use of a movable plate feeder in front of the blast furnace. The method for producing the foundry pig iron from the pig iron for steel manufacture by virtue of silicon pickup outside the furnace has the effects that the surplus molten iron which is generally cast into the pig iron (bread iron) for steel manufacture can be processed into the foundry pig iron having higher quality and value added, and the method is simple and feasible, the production is flexible and efficient, and the components are accurate and controllable.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, and in particular relates to a process for producing pig iron for foundry by adding silicon outside a steelmaking pig iron furnace. Background technique [0002] The foundry industry is the foundation of pillar industries such as automobiles, petrochemicals, steel, electric power, shipbuilding, and textiles. With the development of the foundry industry, the requirements for the comprehensive quality, cost, energy consumption, benefit and clean production of castings are getting higher and higher. [0003] At present, the production methods of casting pig iron mainly include blast furnace direct smelting and silicon addition outside the furnace. When casting pig iron (containing 1.0-3.5% silicon) is directly smelted in a blast furnace, a large amount of silicon reduction reactions must be carried out in the furnace, resulting in a high coke ratio in the blast furnace. The internal...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is the high-efficiency diversion and gain of surplus steelmaking pig iron in blast furnaces in long-process iron and steel enterprises. Aiming at the shortcomings of the above existing technologies, a method for producing pig iron for foundry by adding silicon outside the steelmaking pig iron furnace is proposed , using the surplus molten iron produced in the steelmaking pig iron blast furnace, adjusting it to the composition of the target casting iron by adding silicon outside the furnace, and then using the cast iron machine to cast it into casting pig iron. This method is simple, low-cost, and difficult. Damage to production equipment, flexible and efficient production, accurate and easy-to-control ingredients