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鉻元素固化機理及利用不銹鋼工業含鉻固廢制備無機材料研究進展

Research progress of chromium solidification mechanism and preparation of inorganic materials by Cr-containing solid wastes from stainless steel industry

  • 摘要: 我國不銹鋼工業近年來飛速發展,產生大量含鉻固廢。含Cr固廢的綜合利用工藝技術的開發,Cr元素的解毒/固化機理是需要考慮的關鍵問題。本文綜述了前人在該領域的相關研究工作,包括國內外不銹鋼工業固廢的化學和物相組成、鉻在不同含鉻固廢中的存在形式、鉻在環境中的循環富集規律和毒性。探討了含Cr礦相的演變規律、Cr在不同礦相中的固化機理。總結了目前利用不銹鋼工業含鉻固廢制備水泥、微晶玻璃和燒結陶瓷等各類無機材料的研究進展。分析了目前利用不銹鋼工業含鉻固廢制備各類無機材料過程中存在的瓶頸問題。以期為未來中國無害化、高值化、資源化處理不銹鋼含鉻固廢并實現產業化應用提供基礎借鑒。

     

    Abstract: In recent years, with the rapid development of the stainless steel industry in China, a large number of Cr-containing solid wastes are produced. Chromium resources in China are very scarce, and China mainly dependent on imported chromium. In the current situation of a limited supply of chromium ore in the world, determining the efficient utilization of chromium resources will become very important. The recovery of chromium in various solid wastes produced by the stainless steel industry has practical economic significance. In addition, an uncontrolled emission of Cr-containing solid wastes will endanger the ecological environment and hamper biological safety. Further, the large scale of China’s stainless steel industry has caused urgent environmental problems, i.e., the whole manufacturing process has produced a large number of Cr-containing solid wastes, including stainless steel slag, stainless steel dust, stainless steel rolled iron scale, and pickling sludge. The detoxification/solidification of Cr to obtain long-term safety performance is an important factor that must be considered in the development of a comprehensive utilization process technology for a large amount of Cr-containing solid wastes generated by the stainless steel industry. This paper reviewed the previous research work in this field, including the work regarding the chemical and phase compositions of the stainless steel industrial solid waste, the existing forms of chromium in different Cr-containing solid wastes, the cycle enrichment rule, and the toxicity of chromium in the environment. The evolution law of Cr-bearing mineral phases and the solidification mechanism of Cr in different mineral phases were discussed. The research progress of various inorganic materials such as cement, glass ceramics, and sintered ceramics prepared using Cr-containing solid wastes in the stainless steel industry was summarized. Bottleneck problems in the preparation of various inorganic materials from chromium-containing solid wastes in the stainless steel industry were analyzed to provide a basis for the future harmless, high-value, resource-based treatment of stainless steel Cr-containing solid wastes and the realization of industrial applications in China.

     

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