Characterization of Moroccan coal waste: valorization in the elaboration of the Portland clinker

Abstract

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.

Sustainable Reuse of Coal Mine Waste: Experimental and Economic Assessments for Embankments and Pavement Layer Applications in Morocco

“…It was concluded that mine tailings alone and mixed with fly ash mine wastes can be favourably used as road embankment materials cost-effectively and sustainably. Also, the coal mine waste rocks (CMWR) wastes were successfully interred for the production of eco-friendly fired bricks at a laboratory scale [10,11], in the production of cement [12,13] and asphalt concrete products [14,15].…”

Mechanical and Thermal Behavior of Recycled Low-Density Polyethylene Composites with Coal Mining Waste

“…Due to limited resources and the environmental impacts caused by some materials, researchers began to explore strategies for new ecologically correct materials, considering the source of the raw material, its properties, and final disposal (Govindan et al 2016). Considering its composition, coal mining waste (CMW) has been researched as a raw material in the development of new materials, including ceramics and light aggregates, cement compounds, burned brick compounds, concrete, brick compounds, asphalt filler, dyes, and enamelling (Taha et al 2017;Taha et al 2018;Haibin and Zhenling 2010;Belkheiria et al 2015;Wang et al 2016;Jung et al 2005; Modarres and Rahmanzadeh 2014; Darmane et al 2009). Given the research carried out to understand in which materials the use of CMW is being used, no research mentions the use of hydrophobic polymer matrices in the formulation of composites materials with CMW.…”

Moroccan oil shale and coal waste as alternative raw materials in Portland cement clinker manufacture. Clinkerisation reactions and clinker characterisation

“…Oil shale is one of humanity's most promising sources of energy and chemicals (4) and Morocco has one of the world's largest oil shale reserves (5). Moreover, the Jerada coal mine in the country's northeast generates large amounts of waste (6)(7)(8), with the recoverable total estimated at 134.482 (short) Gt.Valorising that waste would reduce stockpiling, solving urban planning problems and mitigating the environmental impact of pyrite oxidation in the waste (9).…”