Preparation Of Steel Slag Powder Based On Horomill And Its Impact On The Strength Of Cement Mortar

China is a country with the largest crude steel output in the whole word, the production of steel slag is about 10%～12% of the crude steel, and the total amount of steel slag is up to 100 million. The large amount of steel slag occupies a lot of areas and causes environmental problems. At the moment, part of steel slag is being used as aggregates for concrete, asphaltic paving, and road bases. But most steel slag has not been efficiently used yet. Using steel slag as a supplementary cementitious material during the manufacture of cement is an effective and a high efficient way for its utilization. Not only can improve the utilization of steel slag, more importantly, which is significant to save cement resource and protect environment. This paper focus on steel slag powder’s preparation process, performance and impacting on the mechanical properties of cement. The main content and results are listed as follows:(1)According to the characteristics of steel slag hard grinding, Formulate effective pretreatment technology to reduce the amount of iron in steel slag. After pretreatment iron content is reduced to 2%. To investigate the smash theory, operational principle and structural characteristics of steel slag’s grinding equipment-the horomill. Selecting horomill as steel slag’s grinding equipment can maximize the reduction of energy consumption, stimulate the characteristics of steel slag powder.(2) To improve the steel slag powder’s quality and environmental protection. Studies horomill’s seal structure the barrel and the end cover. The results show that: Using of lip seal, felt ring and rubber to improve the sealing structure between the barrel and the end cover on the horomill. The leakage is reduced by 71%. That is to say, the sealing performance of improved sealing structure has significantly increased. Then, as the core with improved horomill combined pretreatment process to formulate steel slag powder preparation process.(3) Starting from the steel slag’s chemical composition and mineral composition to system study the cementitious properties. The results show that:Steel slag alkalinity, iron status, and cooling rate has a significant effect on the cenmentitious properties of steel slag. Appropriate to increase the alkalinity, can enhance the performance of steel slag cementitious. At the same composition under the premise, when the iron in steel slag increases from Fe+to Fe3+ and reduction, the cementitious properties of steel slag can improve. Water quenching can improve the content of C3S, increase the content of the mineral composition of the vitreous, and can reduce the amount of free calcium oxide. To improve the the gelling properties of steel slag and to some extent improve the grindability.(4) On the basis of test, To conduct a comprehensive analysis the relationship between strength, age, the dosage of steel slag about single steel slag cement and slag composite cement with steel slag. The analysis results that:The mortar strength of single steel slag cement decreased with the increase of the dosage of steel slag. If the steel slag powder used in cement or concrete industry, Must take other physical or chemical methods to stimulate its activity, to improve the strength of cement mortar with steel slag powder. When mixed steel slag and slag powder, with the increase of the dosage of steel slag has little effect on the strength of cement mortar. And when the dosage of steel slag is 20%, the strength of cement mortar about slag composite cement with steel slag is higher than the reference sample on 28 day. At the same time, steel slag and slag has optimal dosage ratio of 2:3. After mixed, to replace 50% of cement clinker. Not only to meet the cement mortar strength standards, but also reduces the amount of cement clinker, to improve the utilization of steel slag.