Chromite Proposal Lab

594 Words3 Pages
Introduction The element Chromium is very important in the industrial world. It is used in nonferrous alloys such as stainless steel, in order to increase its hardness and prevent corrosion and oxidation. Chromium is only found in one ore, the mineral Chromite. Chromite’s composition is iron magnesium oxide [(Fe, Mg) Cr2O4]. Occasionally, magnesium will substitute for iron, and aluminum and ferric ions will substitute for chromium. In this experiment we will hope to figure out whether or not the unknown sample contains the very important mineral Chromite. The experiment will consist of a process called hydrometallurgy. Hydrometallurgy is a technique that uses aqueous solution chemistry to recover metals from minerals, ores and salts. Extracting the metal from the solution is the first step in the process of hydrometallurgy. A great way to do extraction is leaching, in which the ore is dissolved into an acid or base. Then the leached solution is purified and the waste can be discarded. Lastly the metal is precipitated through chemical or electrolytic processes. This lab will also rely on some skills and techniques that were utilized in previous experiments, such as the using of amphoteric metals, amphoteric hydroxide solutions, and complex ion formation. Amphoterism is the ability of a substance to react with either bases or acids. An example of an amphoteric metal is Beryllium. Beryllium and all other amphoteric metals form insoluble hydroxides in limited hydroxide solutions and soluble, complex ions when they are in the presence of excess hydroxide solutions. Similar to Beryllium, Zinc and Chromium are amphoteric, but Iron and Magnesium are not amphoteric, meaning that they form insoluble precipitates in basic solutions like excess hydroxide. In this experiment, the unknown sample solution will be mixed with water to dissolve the ions that

More about Chromite Proposal Lab

Open Document