This study describes an overview of the POSCO＇ s Baosteel＇ s short-flow （BSSF） slag processing project, including process flow, process set-up, equipment composition, auxiliary facilities and relevant parameters, ...This study describes an overview of the POSCO＇ s Baosteel＇ s short-flow （BSSF） slag processing project, including process flow, process set-up, equipment composition, auxiliary facilities and relevant parameters, as well as a brief description of its application after commissioning.展开更多
Suitable methods for enhancing the volume stability of steel slag utilized as fine aggregate were determined. The effects of steam treatment at 100 ℃ and autoclave treatment under 2.0 MPa on the soundness of steel sl...Suitable methods for enhancing the volume stability of steel slag utilized as fine aggregate were determined. The effects of steam treatment at 100 ℃ and autoclave treatment under 2.0 MPa on the soundness of steel slag sand were investigated by means of powder ratio, linear expansion, compressive and flexural strength. DTA, EDX, XRD and ethylene glycol methods were employed to analyze both the treated slags and susceptible expansion grains. Experimental results indicate that powder ratio, content of free lime and rate of linear expansion can express the improvement in volume stability of different treated methods. Steam treatment process cannot ultimately prevent specimens from cracking and decrease of strength, but mortar made from autoclave treated slag keeps integration subjected to hot water of 80℃ until 28 d and its strength do not show significant decrement. The hydration of over-burn free lime and periclase phase are the main cause for the disintegration or crack of untreated and steam treated steel slag＇s specimens. Autoclave treatment process is more effective than steam treatment process on enhancement of volume stability of steel slag.展开更多
真空硅热法是我国金属镁的主要生产工艺,每生产1 t镁在煅烧环节会直接排放近5 t CO_(2),在还原环节会产生近6 t的二级固废粉化镁渣,但目前仍没有经济环保的技术来处理上述废弃物。本工作提出可借助生产系统本身的高温工况,使煅烧环节中...真空硅热法是我国金属镁的主要生产工艺,每生产1 t镁在煅烧环节会直接排放近5 t CO_(2),在还原环节会产生近6 t的二级固废粉化镁渣,但目前仍没有经济环保的技术来处理上述废弃物。本工作提出可借助生产系统本身的高温工况,使煅烧环节中的酸性CO_(2)废气与还原环节中的碱性热态镁渣直接反应,同时取得降低镁渣pH值、固碳、回收反应热等效果。结果表明:本工作首先通过热力学计算证实了上述思路的可行性;然后通过设计和搭建试验装置,发现在热态镁渣中通入流动的二氧化碳的确可以同时达到固碳和降低镁渣pH值的效果,且探测到反应过程中释放出显著的热量。以850℃的反应为例,镁渣的碳化程度可达14%,pH值从11.76下降至10.57,且近40%的镁渣没有发生粉化。展开更多
文摘This study describes an overview of the POSCO＇ s Baosteel＇ s short-flow （BSSF） slag processing project, including process flow, process set-up, equipment composition, auxiliary facilities and relevant parameters, as well as a brief description of its application after commissioning.
基金the National Natural Science Foundation of China (No.50678139)
文摘Suitable methods for enhancing the volume stability of steel slag utilized as fine aggregate were determined. The effects of steam treatment at 100 ℃ and autoclave treatment under 2.0 MPa on the soundness of steel slag sand were investigated by means of powder ratio, linear expansion, compressive and flexural strength. DTA, EDX, XRD and ethylene glycol methods were employed to analyze both the treated slags and susceptible expansion grains. Experimental results indicate that powder ratio, content of free lime and rate of linear expansion can express the improvement in volume stability of different treated methods. Steam treatment process cannot ultimately prevent specimens from cracking and decrease of strength, but mortar made from autoclave treated slag keeps integration subjected to hot water of 80℃ until 28 d and its strength do not show significant decrement. The hydration of over-burn free lime and periclase phase are the main cause for the disintegration or crack of untreated and steam treated steel slag＇s specimens. Autoclave treatment process is more effective than steam treatment process on enhancement of volume stability of steel slag.
文摘真空硅热法是我国金属镁的主要生产工艺,每生产1 t镁在煅烧环节会直接排放近5 t CO_(2),在还原环节会产生近6 t的二级固废粉化镁渣,但目前仍没有经济环保的技术来处理上述废弃物。本工作提出可借助生产系统本身的高温工况,使煅烧环节中的酸性CO_(2)废气与还原环节中的碱性热态镁渣直接反应,同时取得降低镁渣pH值、固碳、回收反应热等效果。结果表明:本工作首先通过热力学计算证实了上述思路的可行性;然后通过设计和搭建试验装置,发现在热态镁渣中通入流动的二氧化碳的确可以同时达到固碳和降低镁渣pH值的效果,且探测到反应过程中释放出显著的热量。以850℃的反应为例,镁渣的碳化程度可达14%,pH值从11.76下降至10.57,且近40%的镁渣没有发生粉化。
