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Development of new smelting process by using metal dusting

金属喷粉冶炼新工艺的开发

基本信息

批准号：
11650765
负责人：
MAEDA Takayuki
金额：
$ 2.24万
依托单位：
Kyushu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11650765/
关键词：
metal dusting iron carbide methane gas hydrogen gas reduction アイアンカーバイド

项目摘要

As a fundamental research for the production of fine reduction iron powder by using metal dusting, the decomposition behavior of iron carbide at high temperature (above 750℃) and low temperature (under 750℃) was investigated by using a reagent hematite powder and iron ore particle. Moreover, the decomposition behavior of iron carbide was investigated by using a fluidized bed reactor. The results obtained are summarized as follows:(1) The decomposition rate of iron carbide which synthesized from reagent hematite with H_2-30vol%CH_4 at 750℃ was fastest at 650℃ and 900℃. Moreover, the amount of excess carbon generated during decomposition of iron carbide at 650℃ was 1/5 times that at 900℃. Therefore, The decomposition of iron carbide at 650℃ is well suited to remove the excess carbon.(2) The same experiment was carried out by using iron ore particle (250~600μm) and the same results when reagent hematite powder was used were obtained. Therefore, metal dusting is able to use iron ore particle.(3) The excess carbon generated during decomposition of iron carbide was removed by gasification with CO-20vol%C0_2 at 900℃. The removal rate of excess carbon generated at 650℃ was faster than that at 900℃ because the amount of excess carbon generated at 650℃ was smaller than that at 900℃.(4) It is difficult to remove the excess carbon generated during decomposition of iron carbide by using a fluidized bed reactor because of sintering the decomposition iron.

作为金属粉化法生产还原铁粉的基础性研究，以赤铁矿粉和铁矿石颗粒为原料，研究了高温（750℃以上）和低温（750℃以下）下碳化铁的分解行为。此外，利用流化床反应器研究了碳化铁的分解行为。（1）在750℃、H_2-30vol%CH_4气氛下，以试剂赤铁矿为原料合成的碳化铁在650℃和900℃下分解速度最快。650℃分解时生成的过量碳量是900℃分解时的1/5。因此，在650℃下分解碳化铁是除去过量碳的最佳方法。(2)用250~600μm的铁矿石颗粒进行了同样的实验，得到了与试剂赤铁矿粉相同的结果。因此，金属除尘可以使用铁矿石颗粒。(3)用CO-20vol%CO_2在900℃气化除去碳化铁分解过程中产生的过量碳。650℃下产生的过量碳比900℃下产生的过量碳少，因此650℃下产生的过量碳的去除速度比900℃下快。(4)由于分解铁的烧结，难以通过使用流化床反应器除去在碳化铁分解期间产生的过量碳。