677.463.08 and V. V. YasinetskiiThe zinc content in wastes of viscose fiber production is 14.3 ± 0.5%. The present article proposes to perform reprocessing of the wastes by a method that avoids roasting and electrolysis. Zinc is extracted from the wastes by solutions of H 2 SO 4 (4 M) and HCl (4 M) (preferred) at 70°C for 3 h. The final reprocessing product is zinc oxide. The zinc-oxide content in the resulting ZnO samples is 99.2 ± 0.4%. A conceptual diagram of the method was developed.Zinc and zinc-containing materials are widely used in both the chemical and related sectors. However, their high commercial cost and the increasing demands on the ecological safety of industrial manufacturing are pushing into the critical stage the development of resource-conserving technologies based on zinc recycling, including wastes of viscose fiber production.Wastes of viscose fiber production contain from 5 to 50 mass% zinc [1][2][3][4][5]. The wastes are stored in slag ponds that occupy a significant amount of territory and have a detrimental effect on the environment [6].Zinc from wastes at the synthetic fiber plant Svetlogorsk of Production Conglomerate Khimvolokno (Belarus) is recovered using roasting technology in a Waelz kiln. The resulting zinc concentrate contains 45-55% zinc and requires additional reprocessing into products for industrial purposes. Recycling of the released SO 2 is not considered in the applied technology. This increases the ecological impact [4].Wet processing is a technology for reprocessing zinc-containing raw material that avoids roasting. This is a more ecologically benign version and can extract 97-100% of zinc from wastes or mineral ore on a multi-ton level. The employed reagents are solutions of strong mineral acids, bases, and ammonia. The regeneration process is carried out at temperatures up to 100°C. Therefore, it is less energy-intensive than metallurgical methods that include roasting [4,5].The use of bases to extract zinc from wastes or mineral ore has a serious drawback, i.e., the need to use this method to reprocess wastes (raw material) in which the zinc is present as not only the carbonate, hydroxide, and bicarbonate but also the sulfide, which is insoluble in bases. Furthermore, this method is focused on producing metallic zinc as the final product using electrolysis, which is an energy-intensive process [1,2].The goal of our work was to study the possibility of reprocessing zinc-containing production wastes of OJSC Mogilev Synthetic Fiber Plant in which the zinc was present as the sulfide, carbonate, and bicarbonate without using roasting and electrolysis to produce high-purity zinc oxide. Table 1 gives the composition of the wastes.Zinc sulfide (the mineral sphalerite) was dissolved using H 2 SO 4 , a mixture of H 2 SO 4 and H 2 O 2 , and a mixture of HNO 3 and H 2 O 2 [7-9]. The HCl extract was not used because the solutions were too contaminated by spectator metals and were difficult to purify.
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