Composite cooling agent for steel-smelting and production technique thereof

Abstract

The invention discloses a composite cooling agent for steelmaking and a production process, which consists of 50-70% of steelmaking discharge sludge, 15-30% of continuous casting scale, 2-6% of magnesium chloride, 1-3% of It is composed of humic acid, 2-7% bentonite, and 10-20% dust return material. After removing impurities, the sludge recovered from the sewage discharged from steelmaking and the iron oxide scale of continuous casting are respectively placed on the hollow iron plate. Wet sludge is heated and dried to make slag-like granular raw materials, then dried again to 6-8% water content, mixed according to the raw material ratio, and then pressed to form a spherical billet, and the billet is put into the rotary kiln , preheated for 20-30 minutes, then heated to 900-1000 degrees, and calcined into products at high temperature for 40-60 minutes. The composite cooling agent for steelmaking in the present invention can flexibly and effectively adjust the steelmaking temperature, reduce the difficulty of temperature control, shorten the smelting time, increase the steel output, save the steelmaking cost, optimize the carbon-oxygen reaction in the steelmaking furnace, and increase the metal yield. Efficiency, reducing the discharge of pollutants, improving the effect of energy saving and emission reduction, has good economic and social benefits.

Description

technical field [0001] The composite cooling agent involved in the present invention particularly relates to the cooling agent and its production process in the technical field of steelmaking technology. Background technique [0002] In the process of converter steelmaking, in order to shorten the smelting time, adjust the temperature reasonably, and accurately achieve the hit rate of the end point temperature of converter tapping, it is necessary to use the cooling charge in a timely and appropriate amount. At present, the cooling materials commonly used in the steelmaking process mainly include scrap iron and steel, machine sintered materials, pellets, sintered lumps, fluorite, limestone, and cold-pressed balls as far as we know. After these cooling materials are added to the steelmaking furnace, the following problems will occur to varying degrees: 1. Prolong the smelting time; 2. Unfavorable adjustment of the steelmaking temperature; 3. It is easy to cause splashing and ...

AI Technical Summary

Problems solved by technology

After these cooling materials are added to the steelmaking furnace, the following problems will occur to varying degrees: 1. Prolong the smelting time; 2. Unfavorable adjustment of the steelmaking temperature; 3. It is easy to cause splashing and loss of molten steel, which relatively increases the iron consumption; 4. Improper operation or Inaccurate addition will cause "dry back" in the furnace, reduce metal yield and increase steelmaking cost

Especially sintered agglomerate and limestone, due to the high oxygen content, will affect the slagging and carbon-oxygen reaction in the furnace, increase the amount of slag and the number of times of furnace inversion, too much water in the cold-pressed ball is not strong enough, and it is easy to stick to the converter smoke hood, firefly Stone is an acidic flux that has obvious erosion on alkaline converters. Adding fluorite will form thin slag, corrode the furnace lining, shorten the furnace life, pollute the environment, and destroy the ozone layer.