Cold bonded pellet and method of producing the same

Abstract

The invention provides a cold-bonded pellet used on the raw material of steelmaking or ironmaking and a preparation method thereof. The component and the mass ratio of the cold-bonded pellet are as follows: 8 to 60 percent of precipitator dust and dust sludge, 20 to 85 percent of iron sheet, concentrate powder and iron-bearing auxiliary material, 0.4 to 15 percent of binder. In the preparation method, the moisture in raw material is utilized to directly mix the raw material with other components in a mixer, then the mixture is pressed and formed via a briquetting press after uniform mixing, and the pellet after forming is maintained at room temperature and dried naturally. The cold-bonded pellet of the invention has the advantages of the simple forming process, the low fabrication cost, the rapid hardening of pellet and taking the short time, the high compressive strength, achieving not only the waste recycling and reducing the environmental pollution, but also the high granulation rate, the low damage rate, the wide applicability and the stable quality. The invention is especially suitable for wide application in sintering plant, ironmaking plant and steelmaking plant.

Description

technical field [0001] The invention relates to a high-strength cold-consolidated pellet used in steelmaking or ironmaking, specifically a cold-consolidated iron pellet used in ironmaking to replace pellets, steel scrap in steelmaking or used as a slagging agent and its forming method. Background technique [0002] In ferrous metallurgical production, both steelmaking and ironmaking require corresponding raw materials. The main furnace materials for steelmaking are pig iron and steel scrap. Due to limited resources and quantity, the production cost is relatively high. The raw materials for blast furnace ironmaking are still mainly sintered ore and pelletized ore. Since the ore has undergone a series of production processes such as mining, beneficiation, pelletizing and sintering, ironmaking enterprises have a large investment and increased energy consumption. [0003] In order to develop new smelting raw materials, a reduction shaft furnace or rotary kiln, rotary hearth fu...

AI Technical Summary

Problems solved by technology

But the common problems are: some raw materials need to be dried, the hardening speed of the formed product is slow, the curing time is long, and the compressive strength is low

In the process of storage, transportation and use, the damage is serious, and its dust is easy to cause secondary pollution

In order to improve the strength, drying and firing equipment are added, which complicates the production process and increases the cost; in addition, the binder used also contains sulfur and silicon compounds, which become harmful inclusions in the steel and seriously affect the quality of the steel. The inherent quality of the product limits the scope of use of the product