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Thermochemical Study on High Temperature Process of Zinc Production without Exhaustion of Carbon Dioxide

无二氧化碳排放高温制锌过程的热化学研究

基本信息

批准号：
10450277
负责人：
ITAGAKI Kimio
金额：
$ 2.56万
依托单位：
TOHOKU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10450277/
关键词：
production of zinc carbon dioxide control of exhaust gas zinc sulfide molten copper thermochemistry efficient process energy saving 省エネルギー混合硫化物融体亜鉛蒸気鉛蒸気

项目摘要

Aiming at development of a new pyrometallurgical zinc production process, in which molten copper is used as a reactant to reduce zinc sulfide in the concentrate and which makes metallic zinc without exhaustion of carbon dioxide gas, the new process was thermodynamically and thermochemically evaluated in the present study.Firstly, the solubilities of ZnS and PbS in the ternary CuィイD22ィエD2S-ZnS-FeS and CuィイD22ィエD2S-ZnS-PbS mattes at 1473 and 1523 K were experimentally determined and it was clarified that the solubility of ZnS in the liquid matte was considerably small at less than 6 wt%. This result indicates that a part of ZnS in the concentrate charge in the smelting stage is not dissolved in the matte phase in the case that the amount of the circulated CuィイD22ィエD2S is comparably small. The Raoultian activity coefficients of ZnS and PbS in the matte were found to be 9.8 and 1.3, respectively.Secondly, based on the thermochemical and thermodynamic data obtained in the present study, the … More material and heat balances were evaluated for the new process and the following results were obtained. A huge amount of liquid CuィイD22ィエD2S with 100 - 160 ton per one ton of recovered metallic zinc must be circulated to avoid the over-heating of the reaction furnaces. Hence, the development of a technology to smoothly circulate the CuィイD22ィエD2S medium will be a key to the new process. The heat of oxidation f the sulfides in the concentrates is only one credit in the heat balance in the process, and the combustion of coal or coke will be needed in the oxidation stage to compensate the lacking heat. A use of the oxygen-enriched air for the combustion will be effective to remarkably decrease the amount of the carbonaceous materials to be used. The sensible heats of the produced slag and the exhaust gas were evaluated to be enormous, and their recovery and utilization are significantly important. The gas discharged from the volatilization stage is fundamentally free from COィイD22ィエD2 and SOィイD22ィエD2 and the reoxidation of zinc vapor by these gases will be avoidable. This gives a possibility to refine zinc directly from the discharged gas by means of selective condensation. The use of liquid copper and high grade matte as smelting media was considered to be profitable for recovering the precious metals but to be inadvantageous for eliminating the detrimental elements of arsenic and antimony. Less

本研究以开发一种新的火法制锌工艺为目标，利用熔融铜作为反应物还原精矿中的硫化锌，在不耗尽二氧化碳气体的情况下制得金属锌，并对该工艺进行了热力学和热化学评价。首先，在1473 K和1523 K的条件下，实验测定了ZnS和PbS在Cu′′D22′′d2s′-ZnS′- fes和Cu′′D22′- d2s′-ZnS′-PbS三元锍中的溶解度，明确了ZnS在液态锍中的溶解度很小，小于6 wt%。这个结果表明,一部分的硫化锌精矿在不溶解在冰铜熔炼阶段阶段,流通的数量铜ィイD22摊位ィエd2是相对小的。硫酸铁中ZnS和PbS的拉乌尔田活度系数分别为9.8和1.3。其次，根据本研究获得的热化学和热力学数据，对新工艺进行了更多的物料平衡和热平衡评估，得到了以下结果：为避免反应炉过热，每回收1吨金属锌必须循环100 ~ 160吨的大量液态Cu - 22 - D2S。因此，开发一种能使Cu _(_) _(_() _() _() _() _() _（）介质顺利循环的技术将是新工艺的关键。精矿中硫化物的氧化热只是该过程热平衡中的一个积分，在氧化阶段需要燃烧煤或焦炭来补偿所缺少的热量。使用富氧空气进行燃烧将有效地显著减少所使用的含碳材料的数量。经评价，产生的渣和废气的显热巨大，其回收利用具有重要意义。挥发阶段排出的气体基本上不含CO γ γ γ γ和SO γ γ γ，可以避免锌蒸气被这些气体再氧化。这就有可能通过选择性冷凝直接从排出的气体中提纯锌。使用液态铜和优质冰砂作为熔炼介质被认为有利于回收贵金属，但不利于消除砷和锑等有害元素。少