再生盐的特性-标准-应用协同路径研究OA

Chemical industrial waste salts represent a key barrier to solid waste resource recovery,due to their high solubility and compositional complexity.Reclaimed salts are the core products of waste salt treatment and recycling.They have become a focus of both research and industry.However,insufficient understanding of reclaimed salt products,immature standard systems,and obstructed application pathways hinder their broader use.This study focused on reclaimed NaCl and Na2SO4 from two representative coal chemical enterprises.Their process routes,physicochemical indices,and impurity characteristics were systematically characterized.Application potential was assessed with emphasis on chlor-alkali and other downstream scenarios.Results indicated that Na2SO4 accounted for 96.4％～98.0％and NaCl for 80.1％～81.6％of the products.However,NaCl still contained excessive hardness ions,TOC,and toxic anions,failing to meet chlor-alkali salt specifications.Na2SO4 showed higher purity but contained Ca and Fe impurities(e.g.,Ca 146 mg·kg-1)that limited market acceptance.Existing standards,such as those for dyeing salt,lack targeted impurity limits and cannot fully support large-scale utilization.Moving from"possible use"to"reliable application"required a coordinated approach linking salt characteristics,standards,and application scenarios.Deep impurity removal for NaCl was essential.Tiered quality standards and impurity limited for Na2SO4 must be developed to guide large-scale demonstration and enable closed-loop resource management.