Reduction tempering agent and application thereof in treating steel slag

Abstract

The invention relates to the field of building materials, in particular to a reduction tempering agent and application thereof in treating steel slag. The reduction conditioning agent comprises 35 to 90 weight percent of a carbon-containing component; in the carbon-containing component, fixed carbon is greater than or equal to 40.0 wt%, volatile components are less than or equal to 50.0 wt%, and ash content is less than or equal to 10.0 wt%; the reduction tempering agent further comprises fluorite; the mass ratio of the carbon-containing component to the fluorite is (35-90): (2-40). According to the reduction tempering agent provided by the invention, the steel slag can be subjected to a chemical reaction at a relatively low temperature, a valuable metal iron resource is reduced and recovered, and the tempered steel slag with high gelling activity and no stability problem can be obtained and used as a building material resource, so that the whole full-quantization waste-free utilization of the steel slag can be realized, and the production cost is reduced. The large-scale comprehensive utilization of the steel slag is favorably improved.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a reducing and conditioning agent and its application in processing steel slag. Background technique [0002] Steel slag is the waste slag produced in the steelmaking process. It is a multi-phase and multi-component solid waste with mineral phases such as silicate and ferrite formed as a by-product in the steelmaking process. At present, the stock of steel slag is large, and its output is still increasing day by day, but the comprehensive utilization rate of steel slag is less than 30%. A large amount of stockpiling of steel slag not only occupies land, but also causes serious pollution to the environment. At this stage, as a bulk industrial solid waste that requires harmless, reduction treatment and comprehensive utilization, the resource utilization of steel slag is imminent. [0003] How to truly realize the advanced treatment, efficient utilization and "zero discharge" of ...

AI Technical Summary

Problems solved by technology

At present, the stock of steel slag is large, and its output is still increasing day by day, but the comprehensive utilization rate of steel slag is less than 30%.

But overall, the comprehensive utilization rate of steel slag is still at a low level

[0004] In the field of utilization of steel slag building materials, due to the low gelling activity and poor stability of steel slag powder, it is seriously restricted as an active mineral admixture in cement and concrete. large-scale applications in

The main reason for the above problems is that the existing building material treatment methods for steel slag mainly include physical activation, chemical activation and thermal activation, etc., but the above methods are all back-end treatment methods, and the steel slag used is generally first-hand. Steel slag tailings after hot splashing or hot stuffy treatment, and then magnetic separation, still contain about 3.0% free calcium oxide in the steel slag after such treatment, and there is a problem of the stability of building materials; at the same time, the steel slag tails after magnetic separation Although the content of metallic iron in the slag is significantly reduced, it still contains a large amount of iron in the form of iron oxide inert minerals in the steel slag tailings. The iron ore phase in this form will bind to the steel slag tailings when they are used by back-end building materials. Coagulation activity is adversely affected, and this form of existence prevents the iron in it from being effectively recycled, resulting in a huge waste of metal iron resources

On the whole, the existing treatment methods for steel slag have limited effect on improving its gelling activity, and all of them have certain limitations. They cannot fundamentally change the gelling performance of steel slag. not properly resolved

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