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全球钢铁行业每年有数以亿吨计的熔渣产生,并且越来越多的高炉渣通过水淬粒化处理而生产一种玻璃质产品。这种物质作为硅酸盐水泥的替代物,可以带来可观的价值增值,同时减少了由于石灰石煅烧而产生的CO2排放。然而,水淬粒化渣处理却需要消耗大量的水资源,并且可能带来有害气体排放。更为重要的是,现有的渣处理工艺没有回收其中所含有的热量(大约1.8GJ/t渣)。熔渣干式粒化(DSG)是渣处理领域发生的根本性变革。在这种新的处理方法中,熔渣在旋转盘中由于离心力的作用而自动分离,产生的熔滴在空气的作用下快速急冷固化,同时可回收热能。由DSG工艺处理得到的固态粒渣适用于生产水泥,同时产生的热空气(约500～600℃)可作为现场就地利用的热源。DSG工艺同水淬法相比,在节水、减少排放、余热回收、减少能源消耗和温室气体排放等方面,提供了一种更加可持续的处理方法。澳大利亚联邦科学与工业研究组织对DSG工艺的研究始于2002年,并且在工艺设计创新方面已经取得重大的突破。近期与博思格和一钢公司(澳大利亚钢铁行业CO2减排关键问题解决计划成员之一)合作,研究工作已经拓展到了渣中的热能回收方面。试验设备的应用已经成功验证了这种处理理念,渣处理能力达到了10kg/min,渣处理产品的评估以及初步的技术经济分析取得了令人满意的结果。新工艺的处理规模扩大了一个数量级,并且建造了一个半工业化规模的装置(渣处理能力提高到了100kg/min),业已投入运行,用于对工艺设计进行深度优化和论证。如果一切顺利的话,计划在两年内建立一个更具规模的工业化工厂(熔渣放流速度达到1～2t/min)。介绍了这项新工艺的进展情况,并对近期的一些进展进行了总结。
In the global steel industry, hundreds of millions of tons of slag are produced annually, and more and more blast furnace slag is granulated by water quenching to produce a vitreous product. This material, as a replacement for portland cement, offers significant value added while reducing CO2 emissions from calcination of limestone. However, water quench granulation treatment but need to consume large amounts of water resources, and may bring harmful gas emissions. More importantly, the existing slag treatment process does not recover the heat contained therein (about 1.8 GJ / t slag). Dry slag granulation (DSG) is a fundamental change in the field of slag treatment. In this new treatment method, the slag is automatically separated by the centrifugal force in the rotating disk, and the generated droplets rapidly solidify rapidly under the action of air and simultaneously recover the thermal energy. The solid granulated slag obtained by the DSG process is suitable for the production of cement and the hot air (about 500-600 ° C) generated at the same time can be used as a heat source for on-site utilization. Compared to water quenching, DSG processes provide a more sustainable approach to water conservation, emissions reduction, waste heat recovery, reduced energy consumption and greenhouse gas emissions. The Australian Commonwealth Scientific and Industrial Research Organization’s study of the DSG process began in 2002 and has resulted in major breakthroughs in process design innovation. Recent work with BlueScope and First Company, one of the key players in the steel industry in the world on CO2 mitigation, has broadened its research into heat recovery in the slag. The application of the test equipment has successfully validated this treatment concept with a slag handling capacity of 10 kg / min, satisfactory slag results and an initial technical and economic analysis. The new process was expanded by an order of magnitude and a semi-industrial unit was built (slag handling capacity increased to 100 kg / min) and was put into operation to optimize and demonstrate the process design in depth. If all goes well, we plan to set up a larger-scale industrial chemical plant within two years (slag discharge rate of 1 ~ 2t / min). Introduced the progress of this new craft, and summarized some recent progress.