Slag formation in silicon and ferrosilicon production using quartz, limestone and iron source  

作　　者：Sarina Bao Eli Ringdalen 

机构地区：[1]SINTEF Industry,SINTEF,Alfred Getz Vei 2B,Trondheim 7034,Norway

出　　处：《International Journal of Minerals,Metallurgy and Materials》2025年第4期859-868,共10页矿物冶金与材料学报(英文版)

基　　金：financially supported by the Norwegian Ferroalloy Producers Research Association (FFF) and the Research Council of Norway through KSP project 326581 Recursive。

摘　　要：The production processes for Si and FeSi have traditionally been considered slag-free.However,recent excavations have revealed significant accumulation of CaO–SiO_(2)–Al_(2)O_(3)slag within the furnaces.This accumulation can obstruct the flow of materials and gases,resulting in lower metal yield and higher energy consumption.The main objective of the current work is to enhance our understanding of slag formation during Si and FeSi production.We investigate slag formation through the dissolution of limestone and iron oxide in quartz and condensate,focusing on the reactions between these materials at a gram scale.Our findings indicate that most slag reaches equilibrium relatively quickly at temperatures starting from 1673 K.Notably,slag formation starts at lower temperature when the iron source is present (1573 K) compared to when only CaO is involved (1673 K).The minor elements tend to accumulate at quartz grain boundaries prior to slag formation.Furthermore,the slag produced from condensate contains less SiO_(2)than that generated from quartz with limestone.The type of quartz source and SiO_(2)phase appears to have little influence on slag formation.Good wettability is a significant factor in reaction between quartz and slag.FactSage calculations indicates that the viscosity of the slag ranges from 0.02 to 14.4 Pa·s under furnace conditions,comparable to the viscosity of honey or motor oil at room temperature.

关 键 词：slag formation silicon and ferrosilicon production QUARTZ LIMESTONE iron source CONDENSATE CRISTOBALITE 

分 类 号：TF7[冶金工程—钢铁冶金]