Design Of Low Environment Load Cement Clinker System

In cement industry, a large amount of energy and resource is consumed, and a large quantity of CO₂ is produced. With the development of the society, the demand of cement become more and more, so the energy and resource is decreased quickly, and the quantity of CO₂ is produced more and more. Cement industry have become the seriously polluted industry. Therefore, it is very important that the cement clinker of high performance and low environmental load is studied and evaluated effectively.Nowadays, most of the cement factories still use natural raw material, the quantity of natural limestone consumption is the biggest, which is 1.2 times of clinker output. Limestone's decomposition need to consume plenty of energy, which occupies 66% of the total coal consumption of clinker. The quantity of CO₂ produced about equal to the 55% of clinker output. Reducing environmental load in matching demand to reduce limestone. However, in order to improve clinker performance, the content and activity of C₃S and C₂S must be increased. Namely, the content of CaO in raw material needs to be increased, which is conflicted with the requirement of reducing environmental load. Therefore, the research purpose of this project is: establish cement clinker matching system which not only increase clinker quality, but also reduce environmental load.Major research content of this project includes three parts: cement clinker system design, experiment research and expert system design.In aspect of cement clinker system design, the principle of environment load minimum and clinker performance optimization was put forward, low environmental load cement clinker system has also been established, which adopt four routes of technique to realize the research aim, including high active calcium, low burn worth, mineralizer crystal seed andrare element.The feasibility of four different technical routes have been verified by the result of the systematic calculation and experiment. The result show: industrial waste can reduce environmental load, improve burnability, accelerate clinker formation. Steel slag, M slag, P slag and rare earth have the function of guiding crystallization, can accelerate C3S formation, raise crystallization degree, content and activity.The result of the environment appraisement shows that industrial waste, including electrical stone slag, M slag, P slag and steel slag, can take the place of 8%⁵0% of limestone, reduce 8%²0% of decomposition heat, reduce 180²30 kJ/kg theoretic heat consummation, reduce 6%-14% of coal consummation, reduce 7%-43% of CO₂ exhausted.The high activity clinker formation additive has been researched, whose major gradient is P slag. The additive can act as mineralizer and crystal seed, and can improve the content and activity of C3S, in the same time, can reduce environmental load.In aspect of expert system, polycomponent match calculation program has been designed, and the environment appraisement method based on matching and TG-DTA curve has been put forward. On this foundation, the overall frame of expert system of low environment load cement clinker system has been established. Its characteristic is that it can be used to design polycomponent cement system by the result of environmental evaluation and performance predict, and it is a harmonious and integrated system which has the function of search, inquiry and analysis.