CEE Jan-Mar 2012

Use of Paint Sludge in Cement Kiln:- The unit had conducted the trial run for co-processing of paint sludge generated by Mahindra-2-Wheeler situated at Pithampur, (M.P.). During the trial run, the impact of co– processing have been studied on the clinker & cement properties by collecting & testing hourly samples of raw meal , clinker & cement in Vikram Cement , QC lab. Similarly the impacts on the stack emission & ambient air quality have been studied by MoEF approved Vimta Lab during Pre Co– processing, Co-processing & Post co-processing.. After successful trial run of Paint Sludge, VCW has obtained regular perm1ss1on for co– incineration of paint sludge in our cement kiln. In the current year, VCW has already co processed 305MT. Co-processing of all the wastes in the cement rotary kiln has following environmental benefits: - • High temperature , alkaline environment and oxidizing atmosphere of the cement kiln ensure complete destruction of waste. • Complete scrubbing of exhaust gas due to countercurrent flow of raw materials resulting in trapping of heavy metals, sulphur and other pollutants within clinker. • Inclusion of ashes and residual metals from the wastes within the clinker crystal structure. • Destruction and Removal Efficiency of 99.9%. • No waste is generated that requires subsequent processing. The co-processing result reveals that there is no negative impact on the environment as well as on the clinker & cement properties. Hence co-processing of Hazardous and Non hazardous waste is one of the best alternatives for its disposal, saving of energy resource and in ecological sustainable and environmental friendly manner. In the current year VCW has substituted nearly 5.4% of heat by using waste material. As a recognition of our efforts in Alternate fuel feeding , VCW has been awarded "Rajiv Gandhi Award for Clean Technology 2009-10" by MoEF, GOI and "Environmental Best Practice Award 2012" by Cll. SYNTHESIS OF ALINITE CEMENT USING SODA SOLID WASTE By Asli Gune§*, Dar;. Or. i.Ozgur Yaman **, Prof. Dr. Mustafa Tokyay** **Middle East Technical University – Civil Eng. Department, Ankara,Turkey Turkish Cement Manufacturer's Association, Ankara, Turkey Abstract Alinite cement is a special type of low energy cement which is mainly composed of a silicate phase with mixed oxygen– chlorine anions. The lattice structure of the alinite phase has the ability to accommodate cr ions, thus m1n1m1ze its deleterious effects to steel reinforcing bars. The key property of the alinite cement is the usage of various waste materials in production . This study is dedicated to give a production route of alinite cement using the waste material of soda industry as the main raw material. Soda solid waste, clay an minor amount of iron ore were mixed with certain quantities and burned at six different burning temperatures of 1050, 1100, 1150, 1200, 1350, and 1450°C. The resultant clinkers were investigated by chemical , mineralogical and scanning electron microcopy analysis. Both scanning electron microscopy and X-ray diffraction analysis results showed that alinite clinker is successfully obtained using soda waste at a temperature range of 1050 to 1200°C. In order to obtain the alinite phase, approximately 6 per cent (by weight) of chlorine is required. Moreover, a lime saturation factor of 76, which is lower than ordinary Portland clinker, is needed. Introduction Alinite cements that can be produced with lower burning temperatures serve as a new type of low energy cement to the industry. Alinite cement can be produced by various industrial waste products such as steel plant waste, chlorine containing by-products etc [Odler, 2000]. One of the su itable waste materials is soda solid waste coming out of the Solvay process. The main reason for selecting this waste is its rel atively high chlorine content. Therefore, besides the well– known industries such as steel industry and thermal power plants, soda industry is a potential candidate to provide its waste as an alternative raw material to the cement industry. Alinite Cement Alinite Cement wa'2 developed in the former Soviet Union, and was patented by Noudelman in 1977. CaCI2 added to the Portland cement eli nker raw feed forms chloralinite (Ca,,Si3AIO,sCI) and it is characterized by the presence of the "alinite" phase in the clinker instead of the "alite" [Hewlett, 2004]. Alinite clinker may be produced from a raw meal 14 ·-