Method for producing ball iron with iron scale

Abstract

The invention specifically relates to an approach to produce granular pig iron by oxide iron sheet which belongs to the metallurgical iron making technology field. The invention mainly solves the problem of recycling the waste oxide iron sheet to make steelmaking materials. The special points of the technology are described below: according to the weight unit, the materials are oxide iron sheet (65 per cent to 75 per cent in weight ratio), coal powder (18 per cent to 30 per cent), lime (4 per cent to 8 per cent) and binder (1 per cent to 12 per cent). The above materials are crushed, marbled, reduced and separated to produce finished granular pig iron. The invention is characterized in that: the production has high iron containing but low sulphur and other miscellaneous substances contained, therefore can be taken as the steelmaking material in replacement of waste steel or pig iron, alleviating the tension situation of steel making material lacking; effectively using the mass waste oxide iron sheet of the steel and iron enterprises, the invention turns the waste to the treasure and lowers the production cost greatly; the technical process is easy, the equipment cost is low and the realization is easy. As a newly developed and innovated and advanced technology, the invention is expected to become an important direction of iron steel manufacturing technology.

Description

Technical field [0001] The invention relates to a non-blast furnace ironmaking method, in particular to a method for producing granular iron by high-temperature reduction after mixing iron oxide scale and coal powder, and belongs to the technical field of metallurgical ironmaking. Background technique [0002] Scrap steel and pig iron are one of the main raw materials for modern converter steelmaking. The proportion of scrap steel and pig iron in the converter steel material can be controlled at 0-30%. At present, high-quality steel scrap resources are relatively small, and the price is relatively high. However, the metal recovery rate of ordinary steel scrap is relatively low. Pig iron generally contains relatively high sulfur and phosphorus, and the price is relatively high. In addition, steel raw materials are increasingly scarce, and the price rises sharply, resulting in steelmaking costs. The sharp rise has restricted steel production. Therefore, some steel companies try to ...

AI Technical Summary

Problems solved by technology

At present, high-quality steel scrap resources are scarce and the price is high, while the metal yield of ordinary steel scrap is low, pig iron generally contains high sulfur and phosphorus, and the price is relatively high, and steel raw materials are increasingly in short supply, and the price rises sharply, which makes the cost of steelmaking Rise sharply, limit steelmaking production

Therefore, some iron and steel enterprises try to use sponge iron or metal pellets instead of scrap steel or pig iron, but due to the low metallization rate of sponge iron and metallized pellets, the cooling capacity is too large, after eating a large amount of sponge iron or metal pellets, The heat of molten steel is not enough, the tapping temperature is low, and the amount of steelmaking slag is large, which may easily cause converter splashing

At the same time, the increase of sulfur content in steel also increased the burden of refining desulfurization, so most iron and steel enterprises did not try to adopt this method

On the other hand, in the steel rolling process of iron and steel enterprises, a large amount of iron oxide scale is produced every day. These iron oxide scales contain high iron content, but because no effective recycling method has been found, most of them are treated as waste. cause material waste