A method for reducing iron oxide in steel slag and producing high-activity steel slag

Abstract

The application relates to a steel slag reduction activator and a method for reducing iron oxide in steel slag and producing high-activity steel slag, wherein the steel slag reduction activator includes: 10-90% of limestone and 1-50% of carbon-containing powder. This application uses the composite application of limestone and carbonaceous substances, so that the reduction reaction of iron oxide can be realized at a lower temperature, and can solve the problem of the grindability of steel slag, improve the activity of steel slag, and increase the iron content in steel slag. rate, improve the magnetic separation powder yield in steel slag.

Description

technical field [0001] The invention relates to the field of comprehensive utilization of metallurgical slag, in particular to a method for improving the properties of iron oxide in steel slag, and in particular to a method for reducing iron oxide in steel slag and producing high-activity steel slag. Background technique [0002] The existing high-activity steel slag production methods mainly include the following categories: [0003] One is to add quenching and tempering materials to modify the liquid state of steel slag at high temperature, and use the waste heat of steel slag to generate more active minerals, thereby increasing the activity of steel slag; [0004] The second is the innovation of the primary treatment method of steel slag, such as water quenching, hot stewing, dry granulation, etc., through rapid cooling, the activity of steel slag is improved; [0005] The third is to add chemical stimulant materials, such as chlorides and sulfates with early strength ef...

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Problems solved by technology

[0006] There are certain defects in these methods: at present, many patented methods are to add quenched and tempered materials in liquid steel slag to modify, so as to improve the activity of steel slag, but these patented methods can not be applied to actual production in fact, such as CN102503193A " a The process of preparing cement-like clinker from steel slag with thermal insulation treatment” uses the waste heat of steel slag to modify steel slag. In fact, due to the addition of normal temperature materials, the temperature cannot meet the temperature requirements of active mineral reaction, so active minerals cannot be generated;

[0009] Because of this, although these patented methods are feasible in principle, basically none of them can be implemented on the ground; secondly, the primary treatment of steel slag adopts thermal braising, dry granulation, etc. to improve the activity of steel slag, but at the same time it will It brings about problems such as grindability and reduction of magnetically separated materials, such as wind-quenched slag, and metal iron is oxidized to form refractory minerals, resulting in a significant increase in subsequent grinding power consumption and a serious reduction in economic performance; again, the addition of The method of producing compound admixtures with high activity by chemical stimulants has high cost and is unfavorable for popularization

[0010] At the same time, dry desulfurization (baking soda) technology has been continuously developed and applied, and the application of its by-product desulfurization waste ash has become a difficult problem in the industry, which limits the popularization and application of baking soda desulfurization technology to a certain extent. The main component of desulfurization waste ash is sodium sulfate

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