EXPERIMENTAL RESEARCH ON RECOVERY OF METALS FROM STEEL DUST

从钢尘中回收金属的实验研究

基本信息

批准号：
07555534
负责人：
TAKEDA Yoichi
金额：
$ 1.02万
依托单位：
IWATE UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07555534/
关键词：
Steel dust EAF dust Chlorination roasting Clinker Magnetic separation Reduction roasting Elimination of copper Elimination of tin 製鉄原料金属のリサイクル廃棄物処理亜鉛の揮発製錬

项目摘要

Evaporation roasting for steel dust, in which roasting detrimental non-ferrous elements is separated from iron, has been carried out. We have investigated evaporation of following elements ; zinc, lead, tin, copper, sodium, potassium and chlorine. We intend the non-ferrous elements and the iron to be used as resource in their extraction process. The experimental results are summarized as follows :(1) When we roast steel dust with CaCl_2 under oxidized condition over 1300K,copper well evaporates as copper chloride. Carbon containing in steel dust makes reduced condition and lead to lowers copper evaporation efficiency, the carbon must hence be oxidized prior to the roasting. Lead evaporates more easily than copper does in the roasting. Twenty percent of zinc in the dust evaporates as chloride gas under oxidized condition.(2) The evaporation of tin proceeds with mixing CaCl_2 under reduced condition over 1300K.Thereby 90% of tin in the dust is removable in the best condition.(3) Zinc evaporates under reduced condition without CaCl_2 addition.(4) Sodium and potassium evaporate well both in oxidized and reduced condition. Vapor spices of the elements is not identified.Iron content in the residue of the evaporation roasting, that depends on dust, is 40 to 60%, which is comparable with iron making resource but too low to use that in steel making. The residue is crashed, and then iron is collected by magnetic separation. Iron thus enriches up to 80% and recovery of iron in the magnetic separation is 90%. It is theoretically possible to separate the detrimental elements from iron and to use them in their extraction process but the roasting and separation processes are rather complicated and need a cost.

已经对钢粉进行蒸发烘烤，其中已经进行了烘烤有害的非有产元素与铁分离。我们已经调查了以下元素的蒸发；锌，铅，锡，铜，钠，钾和氯。我们打算在其提取过程中用作资源的非有产元素和铁。实验结果总结如下：（1）当我们在1300k以上的氧化状态下烤钢灰尘时，铜井会蒸发为氯化铜。含有钢灰尘的碳的状况减少并导致铜蒸发效率降低，因此必须在烘烤之前将碳氧化。铅比在烤制中更容易蒸发。粉尘中20％的锌在氧化状态下蒸发为氯化物气体。（2）锡的蒸发蒸发在1300k以上降低的情况下混合了CACL_2。在最佳状态下，粉尘中90％的锡罐在最佳状态下可去除。健康）状况。未识别元素的蒸气香料。取决于灰尘的蒸发烘焙残留物中的铁含量为40％至60％，与铁制造资源相当，但太低，无法在钢制造中使用。残留物崩溃，然后通过磁分离收集铁。因此，铁富集高达80％，磁分离中铁的回收率为90％。从理论上讲，可以将有害元素与铁分开并在其提取过程中使用它们，但是烘焙和分离过程相当复杂，需要成本。