DIRECT RECOVERY OF METALLIC ZINC FROM STEEL-MAING DUST WITHOUT CARBON DIOXIDE FORMATION

从炼钢粉尘中直接回收金属锌而不形成二氧化碳

• 批准号: 12650737
• 负责人: AZAKAMI Takeshi
• 金额: $ 2.24万
• 依托单位: SAITAMA INSTITUTE OF TECHNOLOGY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12650737/
• 关键词: EAF Dust; Zinc Recycling; Metallic Zinc; Steel-making Dust; Carbon Dioxide; Environment; 乾式亜鉛製錬; 亜鉛リサイクル

For the treatment of EAF dusts, some small and larger scale experiments have been carried out applied the iron reduction vaporization method.In the small scale tests, it was conformed that impurities in EAF dusts, lead, copper, cadmium, potassium, chlorine and fluorine etc. would be removed by heat treatment of dust at 1000℃、 for 120 min. . Also zinc in dust was evaporated completely by adding 1. 5 times quantity of waste iron powder after holding under reduced pressure at 1000〜1100℃, 60〜40 min. .To get an information for industrialization of the process, larger scale experiments were planned and succeeded to make a zinc ingot from steel-making dust.The reaction vessel consisted of stainless steel pipe of 120 mm diameter and 460 mm long. Inner construction made of graphite reserver and magnesia crucible was inserted into vessel. EAF dust was briquetted after mixed with waste iron powder and small quantities of powder lime under automatic briquetting press. After dried in drier for 24 hrs. briquetts were charged in crucible and then evacuated and heat it up to 1050℃.Cool it down after holding 1 hr. at specified temperature, solid zinc was taken out from the vessel.After zinc vaporization, residues were crushed into powder and separated to two parts by using magnetic separater. Magnetic materials contains more than 80 percent of metallic iron, it can be reused for reducing agent for zinc vaporization.The industrialization of the process would be brought a big economical effect to EAF dust treating process.

为了治疗EAF灰尘，已经进行了一些小规模的实验，采用了铁还原性分散方法。在小型测试中，符合EAF粉尘，铅，铜，铜，钙，钾，钾，氯和氟的杂质将通过在1000分钟的1000分钟的热处理粉尘处理来清除。 。另外，通过在1000-1100℃（60-40分钟）下压力下，在减小压力下固定后，通过添加1。5倍的废铁粉，完全蒸发灰尘中的锌。为了获取该过程的工业化信息，计划了大规模的实验并成功地从制造钢灰尘制成锌铸铁。反应容器由直径为120 mm的不锈钢管组成，长460毫米。将石墨晶和镁坩埚制成的内部结构插入了容器中。在自动黑色压力机下与废铁粉和少量粉末石灰混合后，将EAF灰尘粉刷起来。在驾驶员干燥24小时后。将煤球带入坩埚中，然后撤离，然后将其加热至1050℃。保持1小时后冷却。在指定的温度下，从容器中取出固体锌。锌分散后，将残留物粉碎成粉末，并使用磁分离器分离为两部分。磁性材料含有超过80％的金属铁，可以重复使用以减少锌分散剂。该过程的工业化将对EAF粉尘处理过程产生很大的经济效果。