Modification Process of Converter Steel Slag by Pressure Steaming and Its Application

Abstract

The invention relates to the field of steel smelting, and particularly discloses a method of reducing contents of free calcium oxide and magnesium oxide in converter steel slag and improving steel slag stability. The method includes maintaining the temperature of the steel slag by utilization of waste heat after liquid steel slag pelletization treatment, increasing pressure during a temperature maintaining process, and subjecting the pelletized steel slag to autoclaving treatment. By utilization of the technology, the waste heat after steel slag treatment is effectively utilized, and therefore heat lost during treatment processes of the steel slag is utilized reasonably and effectively, thus saving energy, and increasing additional value of steel slag production.

Description

technical field [0001] The invention relates to the field of iron and steel smelting, and specifically discloses an improved converter steel slag treatment process. Background technique [0002] In the process of converter steelmaking, a certain amount of quicklime is often added to adjust the basicity of steel slag for slagging, so there will be a certain amount of quicklime in the steel slag of the converter drum. When steel slag is used as a building material, the quicklime will cause the content of free calcium oxide (f-CaO) to exceed the standard, which brings great difficulties to the resource utilization of steel slag. [0003] The steel slag treatment process is generally considered comprehensively from the comprehensive utilization of steel slag, energy saving and environmental protection, and investment. Under the condition of meeting the smooth progress of the steelmaking process, and considering the particle size and fluidity of liquid steel slag, a relatively re...

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Problems solved by technology

[0009] 1) Although the existing steel slag treatment technology has a certain effect on the elimination of unstable factors in steel slag, it is not thorough, and there is a great potential safety hazard when used in building materials;

[0010] 2) The instability of steel slag has caused many green building materials to be unusable, and the added value is very low, and the existing free calcium oxide detection method cannot separate Ca(OH)2 and CaO, so the stability of steel slag cannot be judged based on this method

[0011] 3) After slag treatment, the steel slag still has a residual temperature of 80-200 degrees Celsius, and there is no suitable recycling method, which wastes energy

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