Abstract
Due to the scarcity of natural resources, the option for the recovery of industrial waste for new processes has increased over the last years. However, seeking natural raw materials, some industrials do not perform treatment or separation of some of its components from waste to be reused. This research focuses on the characterization and purification of waste from the industrial pulping of white paper shavings, obtaining kaolin and CaCl2. The waste was subjected to heat treatment at 400°C to burn the cellulose. To separate the CaCO3 of kaolin, a hydrochloric acid (HCl) solution was used to purify the materials, converting CaCO3 into CaCl2 and water in a chemical reaction. To find the best HCl ratios, tests were carried out at three different concentrations: 1.5, 1.8, 2.1M. Residual water was evaporated to recover the CaCl2, and the resulting kaolin from pulp was oven-dried and turned into metakaolin. The analysis performed for the characterization of the materials were: X-ray Fluorescence (XRF) before and after treatment of the material; X-ray Diffraction (XRD); Differential Thermal Analysis (DTA) and Thermogravimetric Analysis (TGA). Scanning Electron Microscope (SEM) was used on the surface structure, morphology and shape studies.
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