转底炉处理钢厂固废工艺的工程化及其生产实践

 钢厂含锌粉尘由于在高炉炼铁工艺中无法有效回收，造成了巨大的资源浪费和环境污染。美国和日本等国家采用转底炉工艺处理钢厂固体废弃物尤其是含锌铅的含铁粉尘，目前已经证明是成功的工艺。介绍了日照钢厂采用转底炉还原工艺处理钢厂固体废弃物，处理能力2×20万t，其特点是原料系统采用冷固结含碳球团，转底炉热源采用两段式煤气发生炉生产的煤气，采用空气、煤气双预热方式回收转底炉烟气系统的余热，金属化球团产品全部作为转炉炼钢的冷却剂使用。经过数月的调试，生产已经正常。其生产实践表明，转底炉工艺可以有效回收钢厂固体废弃物的有价元素，变废为宝。生产的金属化球团形貌保持完好，抗压强度高，金属化率可达到80%左右。转底炉还原工艺在国内成功地工业化生产，将对中国转底炉工艺的发展起到重大的促进作用。

Engineering and Productive Practice on Rotary Hearth Furnace for Steel Dust and Sludge

Dust and sludge containing Zn can not be effectively recovered and reused in the process of ironmaking and steelmaking,which leads to serious resource wastage and environmental pollution.The rotary hearth furnace(RHF) process is proved to be successful for dealing with dust and sludge containing Zn and Pb in American and Japan.RHF process with capacity of 2×200 kt/a was introduced in Rizhao iron and steel Corporation.Its characteristics were as follows,taking cold bonded pellet containing carbon as the material of RHF,coal gas from twin zone gas furnace as heat source of RHF,air and gas preheated for reusing RHF gas waste heat and the metallized pellets used for coolant in converter process.Through trial production for several months,the Rizhao RHF process is successful commercials.Its production practice shows that RHF can effective recovery valuable metal from dust and sludge of steel plant,metallized pellets can keep original shape,good strength,and about 80% of percent metallization.The successful RHF process would promote the development of RHF in China.