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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.

对钢尘进行了蒸发焙烧，将有害有色元素从铁中分离出来。我们研究了以下元素的蒸发；锌、铅、锡、铜、钠、钾和氯。我们打算将有色元素和铁用作其提取过程中的资源。实验结果如下：(1)当钢粉在氧化条件下用CaCl_2在1300K以上焙烧时,铜以氯化铜的形式充分蒸发。钢尘中含有的碳使条件降低，导致铜的蒸发效率降低，因此在焙烧前必须将碳氧化。在焙烧过程中，铅比铜更容易蒸发。粉尘中20%的锌在氧化条件下以氯化物气体形式蒸发。(2)锡的蒸发在还原条件下在1300K以上与CaCl_2混合进行。因此在最佳条件下粉尘中90%的锡可被去除。(3)锌在还原条件下蒸发，不添加CaCl_2。(4)钠和钾在氧化和还原条件下均能很好地蒸发。健康）状况。元素的蒸气香料未鉴定。蒸发焙烧残渣中的铁含量（取决于粉尘）为40%至60%，与炼铁资源相当，但太低，无法用于炼钢。将残渣破碎，然后通过磁选收集铁。铁的富集率高达 80%，磁选中铁的回收率为 90%。理论上可以从铁中分离出有害元素并将其用于提取过程中，但焙烧和分离过程相当复杂且需要成本。