According to statistics from relevant parties, China's iron and steel enterprises produce more than 30 million tons of scrap steel slag each year. Over 300 million tons of coal slag have been accumulated over the years, and the effective utilization rate of scrap steel slag is only about 10%. During the "Twelfth Five-Year Plan" period, China's steel industry is facing tremendous pressure on energy conservation and emission reduction. The National Development and Reform Commission and the Ministry of Industry and Information Technology have issued documents to set targets and requirements for the comprehensive utilization of metallurgical slag resources. The situation is urgent.
The waste slag utilization methods commonly used in China include road construction and backfill engineering materials, and steel slag masonry cement production. The strength standard of "Steel slag masonry cement" is divided into 3 low grades such as 17.5. Recently, Beijing Pinlun Technology Development Co., Ltd. successfully developed 42.5R high-quality cement with the use of self-developed new additive, cement essence, in cooperation with Nanjing Jinjiang Cement Factory, with only 22.5 cement waste slag.
Scrap slag is divided into two types: oxidized slag and reduced slag. The oxidized slag surface is large in quantity and has a small amount of hydraulicity due to its low alkalinity and high iron oxide content. Beijing Pinlun Technology Development Co., Ltd. has thoroughly studied the consumption and utilization of oxidized slag, and selected the scrap slag from Shougang and Shagang to conduct trial and error experiments and developed a technical route to stimulate oxidized slag: chemical excitation activity, mechanical excitation. Activities, processes, materials and other measures. The cement product produced by this technology overcomes the original shortcomings of waste steel slag production cement, and stimulates the potential activity of scrap steel slag, not only the early strength is high, but also the late strength reaches the requirement of 42.5R high quality cement.
The technology can also be applied to the special production of steel slag micro-powder of scrap steel slag, which can reach the national standard of "granulated blast furnace slag powder" and is widely used in concrete and cement industry. Scrap slag disposal is just around the corner.
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