Chromite Sample Lab Proposal

Chromite Sample Lab Proposal - Hydrometallurgy to Analyze a...

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Hydrometallurgy to Analyze a Chromite Sample Aaron Koshy Misal Patel Luke Michalski Kyle Henris October 23, 2009
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INTRODUCTION: Chromite is a special element composed of magnesium, iron, and Chromium, which produces Chromium oxide. Due to the fact that Chromium has such a high melting point and a stable crystalline structure, the only ore of Chromium is the mineral Chromite. However, since there are numerous industrial uses for Chromium it is quite often found in numerous industrial products. Some uses of Chromium include: improvement to the hardness of alloys, more defiant to decomposition, and more resistant in/to high temperatures. Chromium can also be used to manufacture stainless steel through the extraction of Chromium from an ore of Chromite , in addition to being used plating of metals. Hydrometallurgy is a procedure done to extract the metals wanted from a sample of ore, and is used to tell whether or not certain metal species exist in any given element. Extraction is the first step of metallurgy. The procedure is done by taking an appropriate solvent and using it to dissolve the metal. There are several ways to initiate the process of extraction: through leeching or separating the waste from the purified solution or by using chemical or through electrical means by precipitating the metal or one of its pure compounds from the leech solution (Stanton, page 379.) For this experiment, you first have to dissolve the metal into a solvent that’s an acid or water. Then, you purify it. Lastly, you precipitate the metals from the solution by chemical methods. The purpose of this experiment is to determine the chemical content of an unknown metal ore sample and to confirm that the unknown sample is indeed the mineral Chromite. This experiment addresses a couple of principles that were presented in past experiments. In Experiment 6, we did Reaction Stoichiometry to determine whether or not an acid is a substance that gives off hydrogen ions in an aqueous solution. This procedure will be used in the form of
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aqueous solution in Experiment 29. Using the pH meter (as we did in a past lab), will also help in finding the hydrogen ions in an acid solution. This helps in determining which chemicals need to be present in order to form the wanted aqueous solution. Experiment 7 was Types of Chemical Reactions and it will help us in Experiment 29 because we will need to determine precipitate formed after the aqueous solutions are completed (finding out which metals are in the ore sample). Experiment 10 (emission spectra) will allow us to compare the emissions and to find out if iron or chromium exists, leaving us with just magnesium (which will be determined by adding zinc to it to precipitate it). Then the solution will be separated and titrated (Experiment 6) with sodium hydroxide, which will drag the magnesium out, making it magnesium precipitate. Through these processes and skills, the chemical composition of the unknown sample can be
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This note was uploaded on 11/02/2009 for the course CHEM Chem 1211L taught by Professor Atwood during the Spring '09 term at University of Georgia Athens.

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Chromite Sample Lab Proposal - Hydrometallurgy to Analyze a...

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