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

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Hydrometallurgy to Analyze a Chromite Sample Formal Lab Reportl 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. We will use sodium hydroxide, which is a strong base (Whitten, Davis, Peck, Stanley 219), to separate iron and chromium from the solution. Then, iron and chromium
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Lab 29 Proposal, Final - Hydrometallurgy to Analyze a...

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