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鋅浸出渣有價金屬回收及全質化利用研究進展

Research progress in the recovery of valuable metals from zinc leaching residue and its total material utilization

  • 摘要: 鋅浸出渣是一種具有較高綜合利用價值的固廢資源。本文針對鋅浸出渣中有價金屬的回收以及全質化利用的研究進展進行了歸納總結:鋅浸出渣中有價金屬的種類多,如鋅、鉛和銀等具有較高的回收價值,其回收工藝主要有火法工藝和濕法工藝。通過對多種典型鋅浸出渣回收工藝的優缺點和適用性的詳細比較分析,提出了微生物浸出?氯鹽浸出聯合的方法,該方法可高效浸出鋅浸出渣中的鋅、鉛和銀,對不同類型的鋅浸出渣具有良好的適用性,展現出了良好的工業應用前景;其次,介紹了鋅浸出渣全質化利用的進展,展望了技術發展方向,鋅浸出渣全質化利用將朝著制備性能優異、精細化和綠色節能的高端材料方向發展,在實現鋅冶煉行業清潔生產的同時努力獲得更大的經濟效益。

     

    Abstract: China has maintained the world’s highest zinc production for many years, which has generated a tremendous amount of zinc slag, and 60% of which has not been effectively treated. Most of this slag is zinc leaching residue produced by the hydrometallurgical processing of zinc. The accumulation and storage of zinc leaching residue requires large tracts of land and harmful elements like arsenic and cadmium in the residue contaminate the surrounding soil and groundwater. From another perspective, zinc leaching residue represents a solid waste resource with a very high comprehensive utilization value. For example, many valuable metals are present in zinc leaching residue, including zinc, lead, and silver, which have high recovery values. In addition, zinc leaching residue can be fully utilized to produce cement, glass, ceramics, and a range of chemical materials. The comprehensive recovery and total material utilization of zinc leaching residue would help to significantly reduce the burden of its storage. This paper summarized research progress on the recovery of valuable metals from and the total material utilization of zinc leaching residue. Two main methods were used to recover valuable metals from this residue: pyrometallurgical and hydrometallurgical processes. Based on a detailed comparative analysis of the advantages, disadvantages, and feasibility of various typical recovery processes, this paper proposed a combined method of bioleaching and chloride leaching for the efficient extraction of zinc, lead, and silver from zinc leaching residue. This combined method has good applicability to different types of zinc leaching residue and good prospects for industrial application. In addition, this paper introduced the progress achieved in the total material utilization of zinc leaching residue and the future development prospects for utilization technologies. The total material utilization of zinc leach residue should be developed to product high-performance, sophisticated, environment-friendly and energy-efficient materials. Greater economic benefit can be gained while realizing clean production in the zinc industry.

     

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