Abstract
Coal exploited in the mine of Jerada (northeast of Morocco) was accompanied by large quantities of waste. The purpose of this work is to characterize this waste with the aim of its use as a material for civil engineering. Mineral and chemical investigations on this waste in the raw state, and at different temperature of heat treatments, were carried out by various methods: X-ray fluorescence, X-ray diffraction, infrared spectroscopy. These analyzes showed that the studied waste, contain essentially a mineral part formed by silica and various clays, as well as coal’s residues. The thermal investigation of waste, by differential scanning calorimetry (DSC), revealed an exothermic phenomenon attributed to the combustion of coal residues. Other phenomena were noted on the thermograms due to the mineral part transformations. In this analysis a comparison was also made with pure coal. These characteristics of coal waste encourage studying its development in reducing energy consumption in the Portland cement manufacture. Mixtures of waste with limestone or with raw cement materials were studied, and the resulting products were analyzed by different methods.
Highlights
Coal mining in the mine of Jerada was stopped in 2001
II.1.1 Chemical analysis by X-ray fluorescence. This analysis (XRF), for the samples CW1, CW2, CW3 and coal waste (CW), gives the weight content for the most abundant elements and the loss on ignition (LOI) .The results are summarized in table 1
Mineralogical analysis shows that the waste of coal contains mostly a mineral part formed of silica and clays (2:1 layer) such as muscovite, illite and clinochlore
Summary
Coal mining in the mine of Jerada (northeast of Morocco) was stopped in 2001. This coal was an anthracite form containing at about 2 and 5% of pyrite. Coal production was accompanied by large quantities of solid waste estimated between 15 and 20 Mt [1] and abandoned in open air in the form of a large embankment This waste exposed to climatic hazards conducts to serious ecological problems. The presence of sulfates can be interpreted as coming from the oxidation of the pyrite (2-5 % of coal) with air and water The purpose of our study is to characterize the Moroccan coal waste of Jerada with the aim of its recycling or its valorisation. To investigate the possibility of its energetic contribution, we carried out a thermal investigation using differential scanning calorimetry (DSC) Based on these characterizations of this coal. MATEC Web of Conferences waste, we study its recycling and recovery in the field of hydraulic materials
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