Silica extract from Malang beach sand via leaching and sol-gel methods

<span>Many silica minerals are found in beach sands. One of its sands is Bajul Mati sand which contains high silica. The can be extracted using existing methods, but it less environmentally friendly. In this research, the extracting process from (South Java-Indonesia) has been carried out through a method that low-cost and more friendly</span><span lang="IN">.</span><span> purpose study was to characterize with instrumentation results economic analysis. </span><span>via leaching sol-gel methods: i) 7</span><span>M HCl</span><span lang="IN">,</span><span>ii) formation clear sodium silicate solution (Na<sub>2</sub>O.SiO<sub>2</sub>)</span><span lang="IN">,</span><span>iii) sol-gel: titrated oxalic acid (H<sub>2</sub>C<sub>2</sub>O<sub>4</sub>) 1 M until pH 6 obtained silicite Si(OH)<sub>4</sub> formed</span><span lang="IN">,</span><span> iv) characterization X-ray fluorescence (XRF), diffraction (XRD), Fourier transform infrared (FTIR), scanning electron microscopy (SEM) </span><span lang="IN">with</span><span> result showed cristobalite structure based on XRD purity (% Wt Si) reached 93.9% XRF FTIR analysis identified silanol, siloxic, siloxane groups. SEM shows (SiO<sub>2</sub>) particles tend form agglomerations about </span><span>∼</span><span>1 μm. lang="IN">In a</span><span>ddition, will support implementation future, so produced by developed method.</span>