Application of the Microwave Technology for the Processing of Iron Hydroxisulphates Recovered from Lignite Mine Acid Water
Associated with the development of a novel microbiological oxidation process for the conditioning of iron hydroxide slurries from ferrous mine waters,there is a realistic chance to make the contained iron available for a material utilization.The transformation of ferrous into ferric compounds is coupled with the precipitation of iron hydroxisulphate mostly in terms of the mineral Schwertmannite.The further treatment of the iron hydroxisulphate has to be aimed on the processing for product recovery and product refinement.For many potential applications,e.g.in the ceramic industry,the pigment industry or for metallurgical applications,the removal of sulphate is essential.For the dehydration of the iron hydroxisulphate and the sulphate removal,microwave heating technology is a beneficial method.In contrast to conventional thermal heating processes the supply of energy in microwave application takes place directly within the material through the dissipation of electromagnetic energy,i.e.no heating medium is needed.It is a volumetric heating process regardless of the surface of the material.The rapid and targeted energy supply and the good controllability of microwave heating systems are advantages which have led to a wide variety of applications in industrial processes.Among the diverse use for heating of temperature-sensitive,chemical and pharmaceutical products as well as foodstuffs the number of applications also in mineral and solid processing increases.At the Department for Mechanical Process Engineering and Solids Processing of the Technical University Berlin the use of microwave technology for the treatment of iron hydroxisulphates has been investigated systematically within the framework of a cooperative research project.The paper at hand shows results from material conversion tests subject to a variation of the relevant process parameters.The reaction products are characterized and the process is compared with the conventional heating in a rotary kiln.
Microwave technology Desulphurization Iron oxide Acid mine water
H.Z.Kuyumcu J.Rosenkranz S.Wilck
Dept.Mechaaical Process Engineering & Solids Processing,Technical University Berlin,Germany
国际会议
XXIV International Mineral Processing Congress(第24届国际矿物加工大会)
北京
英文
3878-3887
2008-09-24（万方平台首次上网日期，不代表论文的发表时间）