含锌转炉炼钢泥的理化特性分析研究

Analytical research on physicochemical property of zinc-containing dust from converter steelmaking process

转炉尘泥是转炉炼钢过程中产生的副产物,由于炼钢时加入了含锌原料,使转炉尘泥中的含锌量持续升高而不能直接利用。本文采用ICP、激光粒度分析、XRD和SEM-EDS等分析手段对转炉炼钢湿法收尘泥进行了分析。结果表明:含锌转炉泥中主要含有Fe、Ca、Zn等元素,其中,w(Fe)为48%~50%,物相为Fe3O4、Fe2O3与FeO;w(Zn)为3.5%~3.7%,物相为ZnO与ZnFe2O4,且主要以ZnFe2O4形式存在;含锌转炉泥的粒径分布窄,主要集中在0.1~1.0μm之间,90%的颗粒粒径小于1μm。此外,通过对其特性分析发现,目前常用的含锌尘泥处置方法对其存在一定的不适用性,解决含锌转炉尘泥的回用问题还需寻求更有效且经济的技术方法。

Converter dust is a by-product produced in the process of converter steelmaking.Due to the addition of zinc-containing raw materials during steelmaking, the zinc content in the converter dust continues to increase and cannot be used directly.In this article, ICP,laser particle size analysis, XRD,and SEM-EDS and other analytical means are adopted to analyze the converter dust produced by wet dust collecting in converter steelmaking.The results show that, zinc-containing converter dust mainly contains such elements as Fe, Ca, Zn, etc.Among them, w(Fe) is 48%~50%,and the phases are Fe3O4,Fe2O3 and FeO;w(Zn) is 3.5%~3.7%,the phases are ZnO and ZnFe2O4,and mainly exist in the form of ZnFe2O4;the particle size distribution of zinc-containing converter dust is narrow, mainly between 0.1 and 1 μm, and 90% of the particles has a particle size of less than 1 μm.Besides, based on the analysis of its characteristics, it is found that the currently commonly used zinc-containing dust disposal methods exist a certain inapplicability.It is necessary to seek more effective and economical technical methods to solve the problem of the reuse of zinc-containing converter dust.