基于CART模型的高铁灰渣玻璃形成能力研究

Investigation of Glass-Forming Ability of High-Fe Ash Based on CART Model

王伟 ¹方广 ¹陈祎 ²张乾生 ²徐凯¹

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作者信息

1. 武汉理工大学硅酸盐建筑材料国家重点实验室,武汉 430070
2. 中广核环保产业有限公司,深圳 518028
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摘要

固化技术是极具前景的危废无害化与资源化处理技术,而高铁类危废灰渣铁含量高,易诱发玻璃体产物析晶或分相,这成为固化过程的难点之一.本文依据高铁类危废灰渣组成,采用极端顶点设计方法,设计了 385个SiO2-Al2O3-CaO-Na2O-TiO2-Fe2O3体系玻璃配伍,并通过光学显微镜、X射线衍射及酸溶试验,确定其中136个配伍可形成化学稳定性良好的玻璃态样品.结合决策树(CART)模型分析,确定了具有优化玻璃形成能力的高铁类危废灰渣玻璃化配伍范围(按质量分数w计):40.0％≤ w(SiO2)≤55.0％、10.0％≤w(CaO)＜14.0％、14.0％w(Na2O)≤18.0％、5.0％≤ w(Other)＜9.5％或 35.0％≤w(SiO2)＜40.0％、9.0％≤ w(TiO2)≤ 10.0％、5.0％≤w(Other)＜9.5％,为高铁类危废灰渣的玻璃化配伍提供了设计与计算依据.

Abstract

Vitrification technology is a promising method for hardless and resourceful treatment of hazardous waste.However,the vitrification of high-Fe hazardous waste ash is difficult due to its high-Fe content,which can lead to the crystallization or phase separation of glass.In this paper,based on the composition of high-Fe hazardous waste ash,385 glass formulations with SiO2-Al2O3-CaO-Na2O-TiO2-Fe2O3 systems were designed using extreme vertices design method.Optical microscopy,X-ray diffraction and acid dissolution test were employed to identify 136 formulations to form glass samples exhibiting excellent chemical durability.Based on CART model analysis,the study determines the range of glass formulation for high-Fe hazardous waste ash with optimal glass-forming ability,in mass fraction(w):40.0％≤w(SiO2)55.0％,10.0％≤w(CaO)＜14.0％,14.0％≤w(Na2O)≤18.0％,5.0％≤w(Other)＜9.5％or 35.0％w(SiO2)＜40.0％,9.0％≤w(TiO2)≤10.0％,5.0％≤w(Other)＜9.5％.The research in this paper provides design and computation for glass vitrification of high-Fe hazardous waste ash.

关键词

危险废物/固化/玻璃形成能力/玻璃化配伍/CART模型

Key words

hazardous waste/vitrification/glass-forming ability/glass formulation/CART model

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出版年

2024

硅酸盐通报

中国硅酸盐学会中材人工晶体研究院

硅酸盐通报

CSTPCD北大核心

影响因子：0.698

ISSN：1001-1625

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