Lab 29, Final - Hydrometallurgy to Analyze a Chromite...

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Hydrometallurgy to Analyze a Chromite Sample Formal Lab Report Haley Gowen Michele Chan Amanda Huels Drew Benz October 17 th , 2009
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Introduction Chromite is an oxide mineral and is the only ore of chromium, which has many industrial uses. Chromium is used to harden steel, to manufacture stainless steel, and, the most common, to form various alloys. Chromite is resistant to the altering affects of high temperatures and pressures, thus it is capable of going through processes unchanged. This characteristic explains the use of chromite for forming bricks and shapes (Whitten, Stanton, Atwood 379). Hydrometallurgy is part of the field of extractive metallurgy and involves aqueous chemistry for the recovery of metals from ores or concentrates. Hydrometallurgy is divided into three processes: leaching, solution concentration and purification, and metal recovery. Leaching involves the use of aqueous solutions which contain a lixiviant. A lixiviant is added to the solution to selectively extract a desired metal once it is brought in contact with the material containing the metal. After leaching, the solution undergoes a concentration of the ions that are to be recovered. It is also purified to remove unwanted components. Lastly, the desired metal is recovered by precipitating the compound (Whitten, Stanton, Atwood 379). In this experiment, one will be performing a hydrometallurgical procedure to determine the chemical content of a chromite mineral sample. The process is to extract magnesium, iron and chromium from the unknown sample and prove these chemicals are present. Iron and chromium can be compared with a given sample of chromium nitrate and iron nitrate through spectroanalysis. According to Whitten, Stanton and Atwood, nitrates are generally soluble; therefore we will be able to dissolve the solids in water to run through the spectrometer. This will give us the absorbance of these two samples. Magnesium can be through a two step reaction process where we will extract out possible Iron and Chormium through a reaction with Zinc. Then after filtration to remove the unwanted components, we will recover or separate out the magnesium using a metathesis reaction in which Magnesium will precipitate in the present of excess OH (Whitten, Stanton, Atwood 79). The present of a white Mg(OH)2 precipitate will verify Magnesium’s presence in the sample.
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Experimental “Caution: Students must wear departmentally approved eye protection while performing this experiment. Wash your hands before touching your eyes and after completing the experiment.” (Whitten, Stanton and Atwood) Part 1: 1. Make a “plastic scoopula” (Whitten, Stanton and Atwood) by cutting off the top half of a beral pipet. 2.
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This note was uploaded on 10/05/2011 for the course CHEM 2211 taught by Professor Hubbard during the Fall '07 term at University of Georgia Athens.

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Lab 29, Final - Hydrometallurgy to Analyze a Chromite...

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