Rotary furnace cooling agent and manufacturing method thereof

Abstract

The invention provides a rotary furnace cooling agent and a manufacturing method thereof. The cooling agent is a carbonic and ferreous conglomeration which mainly takes iron scale, carbonic dry ash and ferreous dry waste material as raw materials, and prepared by additionally adding caking agent into the raw materials. The weight percentage of the main chemical compositions of the cooling agent meets the following condition: the carbon content is 5-25%, the content of TFe is more than or equal to 50%, the content of S is less than or equal to 0.50% and the content of P is less than or equal to 0.50%. The manufacturing method comprises: the iron scale, the carbonic dry ash and the ferreous dry waste material are firstly sent into a blending machine to be mixed together and evenly mixed with the caking agent; after being evenly mixed, the materials are sent into a mixing mill and then into a twin-roller ball press machine to be pressed into conglomeration; the pressed conglomeration is screened by a sieving machine, and the qualified screened conglomeration can be sent into a dry furnace to be dried, so that the finished product conglomeration can be obtained. The rotary furnace cooling agent can be used for replacing the common waste steel to be applied in smelting of a rotary furnace; compared with the prior art, the cooling agent completely uses the waste materials generated in the steel production, so that the process flow is short, the cost is low, the using method is flexible, the adding quantity is large, the recovery rate is high, the field operation is seldom affected, the economic benefit and the environmental protection benefit are remarkable, and the promotion and application values are excellent.

Description

technical field [0001] The invention belongs to the field of metallurgical waste recycling, in particular to a converter coolant using metallurgical waste as a raw material and a manufacturing method thereof. Background technique [0002] In the process of converter steelmaking, in order to make good slag, early melt slag and control the appropriate temperature of molten steel, it is necessary to add cooling and flux. [0003] Traditional cooling and fluxing agents, including lump iron ore, steel scrap, fluorspar, lime, etc. When lumpy iron ore is used as the cooling flux, due to the low iron content of the lumpy iron ore, the main components are mostly iron oxides that are difficult to reduce, and most of them are acidic ores. Not only the metal recovery rate is low, but also the amount of slag increase, the life of the furnace lining is reduced, and it cannot play a good role as a flux; when scrap steel, lime and fluorite are used as cooling and flux agents, on the one ha...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a converter coolant and its manufacturing method using metallurgical dry waste as raw material, which can replace ordinary steel scrap, has low cost and good effect, and can overcome the existing deficiencies in cooling and flux, and solve the problem of iron and steel plant Carbon-containing and iron-containing scraps cannot be used efficiently, and the cost of steelmaking plants is rising rapidly due to the purchase of scrap steel.

This solves the problem that the converter coolant made of other iron-containing wastes has a high content of FeO, which may easily cause splashing, slag running and overflow during converter smelting, which will affect the smelting operation and limit the amount of addition.

Images