Brine water is known to contain minerals concentration that can be utilized for many industrial applications but fall short due to the difficulties in extracting it. Commonly known methods to extract the minerals contained in brine water is through the use of chemical reagents to form ion precipitation. In this study, chemical reagents such as Ammonium carbonate ((NH_4)_2CO_3), ammonium hydroxide (NH_4OH), and sodium carbonate (Na_2CO_3) with concentration of 4N was used to precipitate brine water from hot spring of Tirtasanita, Indonesia. In short, the procedure used was in conjunction with previous research, in which the mixing of chemical reagents into brine water with reagent volume ratio varied by 20/1; 5/20; 10/20; 20/20; 20/30; 20/40; 20/50 and 20/60, continued with stirring until precipitation is formed. Filtrate was then separated from the precipitate and characterized with ICP-OES and SEM-EDS, respectively. The preliminary characterization showed that the initial brine water chemical concentration which mainly had 52.8 ppm Ca, 313.9 K, 127.6 ppm Mg, and 1208.9 Na, shift to increase the amount of Ca, K, Mg, and Na after evaporation. The varied volume ratio used for each of the chemical reagents also formed different amount of precipitate, with varying shape and chemical composition. In this experiment the change of each elements in the brine water chemical composition is observed and analyzed. The results of the experiment showed that there are two kinds of salt that can be precipitated from the chemical reagents used, namely, calcium carbonate (CaCO_3) and magnesium chloride (MgCl_2) with the use of (NH_4)_2CO_3 and NH_4OH, respectively. The analysis on precipitated compounds showed that around 90 % of the respective element presents in the resulting salt. The technique and chemical reagents involved are recommended to be used in the synthesis of respective salts from brine water from hot spring due to its simplicity and low cost.
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