Construction of Separation Processes for Man-Made Resources of Cr-P-Fe Alloy

Cr-P-Fe合金人造资源分离工艺的构建

• 批准号: 12450305
• 负责人: MASUKO Noboru
• 金额: $ 10.43万
• 依托单位: Chiba Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-12450305/
• 关键词: ferrous man-made resources; volume reduction of drainage mud; Para-Eco Process; chromium recovery; phosphorus recovery; 酸化浸出; 鉄系人口資源; 下水汚染の減容; パラ・エコ; リン回収; 下水汚泥の減容

This research project was planned on the basis of the new concept "metal laundering for man-made resources", which had been proposed by the author. Wastes from highly industrialized society have such combinations of elements that ordinary processes of extractive metallurgy have not met with. An establishment of new separation processes for such wastes may change them into useful resources. A chromium-phosphorus-iron alloy produced by electric furnace fusion of drainage mud is one of the typical kinds of waste waiting to be transformed into new resources.Three schemes for processing the wastes had been proposed at the beginning of this project. Through preliminary studies, two of them were selected for detailed research. One (scheme-1) is a sulfuric acid dissolution followed by successive oxidation of leach products. The other (scheme-2) is a use of new solvent made of a mixture of HCl and NaCl.For the scheme-1, detailed investigations proved that aqueous oxidation of Fe(II) and phosphite ions by gaseous oxygen was promoted by an addition of SO_2. For the scheme-2, a new solvent enables quick dissolution to ferrous alloys. The dissolution process shows activation energy of 60 kJ/mol.

本研究课题是根据作者提出的“人工资源金属洗选”新概念而设计的。来自高度工业化社会的废物具有普通的提取冶金工艺所不能满足的元素组合。建立新的废物分离工艺可以将其转化为有用的资源。电炉熔融法生产的铬磷铁合金是一种典型的资源化废物，项目初期提出了三种处理方案。通过初步研究，选择其中两个进行详细研究。一种（方案-1）是硫酸溶解，随后是浸出产物的连续氧化。另一种是使用HCl和NaCl的混合溶剂（方案2）。对于方案1，详细的研究表明，加入SO_2促进了气态氧对Fe（II）和亚磷酸根离子的水溶液氧化。对于方案2，新的溶剂能够快速溶解到铁合金。溶解过程的活化能为60 kJ/mol。