砷碱渣综合处置与资源化利用的研究

Study on the comprehensive disposal and resource utilization of arsenic-alkali slag

砷碱渣的无害化处置关系到环境和人体健康,以及锑冶炼行业的可持续发展。本文针对砷碱渣处置过程中的难点,提出了一种无害化处置砷碱渣并资源化回收其中有用成分的工艺。该处置工艺主要包括四个部分:砷碱渣浸出工序、浸出液碳化工序、碳化后液碱性脱砷工序和脱砷碱液循环浸出工序。针对影响每个工序的关键因素以及潜在机理,本文进行了系统地研究和总结。采用本文所提出的砷碱渣处置工艺,在实现砷碱渣中砷组分无害化处置前提下,获得了含砷仅为0.19%的碳酸氢钠产品,以及含砷高达26.98%的高砷渣,并实现了工业用水的零排放。

The harmless disposal of arsenic-alkali slag is related to the environment and human health,and the sustainable development of antimony smelting industry.Aimed at the difficulties in the process of arsenic-alkali slag disposal,this paper puts forward a process of harmless disposal of arsenic-alkali slag and recycling of useful components in it.The treatment process mainly includes four parts:leaching process of arsenic alkali residue,carbonization process of leaching solution,alkaline dearsenization process,and cyclic leaching process.In this paper,the key factors and potential mechanisms affecting each process are systematically studied and summarized.Under the premise of realizing harmless disposal of arsenic component in arsenic alkali residue,NaHCO_(3) products containing only 0.19%arsenic were obtained by using the disposal process proposed in this paper,and zero discharge of industrial water was realized.