Progress and Prospects of the Preparation of Cementitious Materials Based on Nonferrous Metallurgical Slags
Received date: 2020-07-17
Revised date: 2020-08-25
Online published: 2020-11-05
Nonferrous slag，a by-product of the nonferrous metal smelting process，can be used as a replacement for cement in the preparation of cementitious materials，which is a critical way to utilize large amounts of non-ferrous metallurgical solid waste resources.This study systematically analyzed to shed light on the latest research progress and achievements on the cementitious materials mainly prepared with the non-ferrous metallurgical slags both in China and abroad.Particularly，five aspects are emphasized in this paper，which are the composition and structural characteristics of nonferrous slag，potential cementitious properties，the activation method of slag，the preparation methods of cementitious materials，and the performance of its cemented body，respectively.The results showed as below：First，the mineral composition and structures of nonferrous slag differed widely.The crystallization of silicate mineral is almost complete and has high chemical stability，but the content of the vitreous body is lower.Second，the evaluation method of nonferrous slag potential gelling activity and the activity evaluation criteria are inconsistent.Third，the combination of phase modification and compound activation method could effectively improve the gelling activity of nonferrous slag.Fourth，nonferrous slag cementitious materials has good durability and high-temperature resistance and has certain properties of heavy metal solidification.At present，the preparation of cementitious materials based on nonferrous slag is mainly laboratory-based with few examples of large-scale industrial applications.The fundamental reason is that the problem of low and insufficient activity of nonferrous metallurgical slag has not yet been completely solved.As such，changing the structural characteristics of non-ferrous metallurgical slag is the key to overcoming the obstacles to its large-scale industrial utilization.Followed by this，the paper next discussed some important issues involved in the preparation process of cementitious materials and highlights the importance of the establishment of a non-ferrous metallurgical slag cementing system configuration database，the use of molecular research on simulation optimization of activation methods，and the development of simple and efficient activation methods，all in an effort to hasten the expansion of the future industrial application of non-ferrous slag cementitious materials preparation technology.
Lijie GUO , Lei ZHANG , Wenchen LI . Progress and Prospects of the Preparation of Cementitious Materials Based on Nonferrous Metallurgical Slags[J]. Gold Science and Technology, 2020 , 28(5) : 621 -636 . DOI: 10.11872/j.issn.1005-2518.2020.05.128
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