Abstract
This is a research report of the effects of process variables on the reactivity of slaked lime produced from Shuk quicklime. It involved the calcination (at temperature of 1000 0C, particle size of 90 µm and time of 3 hrs) of Shuk limestone and subsequent slaking of its quicklime. The quicklime was characterized by x-ray diffractometer (XRD) and scanning electron microscopy (SEM) respectively to determine its mineral content and surface morphology respectively. Effects of process variables (quicklime/water ratio, particle size and time) on the reactivity of the slaked lime were determined. The reactivity was optimized using response surface methodology (RSM). The XRD analysis revealed calcite as the type mineral of the Shuk quicklime. The surface morphology of the quicklime sample showed that the particles are packed together in powdered form with visible pores that will allow passage of water. Reactivity of the lime was influenced by the quicklime/water ratio, particle size and time. Quadratic model appropriately explained the relationship between reactivity and considered slaking factors of quicklime/water ratio, particle size and time. The optimum reactivity value of the slaked lime was obtained as 59.3 oC at quicklime/water ratio of 0.24 g/ml, particle size of 88.2 µm and time of 15.1 minutes.
Highlights
Shuk limestone deposit is at Sokoto State, North-West geopolitical zone of Nigeria
Effects of the Process Variables on the Slaked Lime Yield of Shuk Quicklime The effects of quicklime/water ratio, particle size and time on the reactivity of the Shuk slaked lime are presented in Figures 3, 4 and 5 respectively
The reactivity increased with increase in quicklime/water ratio till it got to the peak from where decline in the reactivity was noticed
Summary
Shuk limestone deposit is at Sokoto State, North-West geopolitical zone of Nigeria. Application of the limestone has not been fully diversified. Information on the quantity and quality of limestone is required for the establishment of limestone factory. This precondition will inform other secondary complimentary geological surveillance for earth resource based industries [1]. Activities that attract establishment of limestone factories include extraction and processing of the limestone. Mining and quarrying activities of limestone are detrimental to the environment [2, 3]. The general procedures of processing limestone begin with initial cutting, followed by application of a finish, and a second cutting / shaping step. Limestone extraction process involves the following stages; locating the stone, removing the stone using heavy machinery, securing the stone on a vehicle for transport, and moving the material to storage
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