experiment 29-4

experiment 29-4 - Hydrometallurgy to Analyze a Chromite...

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Hydrometallurgy to Analyze a Chromite Sample (Experiment 29) Ines Banic Maida Huskic Jessica Bookout Neil Patel November 17, 2009
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Introduction: This experiment will help determine how solutions in chemistry are mixed to form precipitates and also new solutions involving a variety of different chemicals and metal ions. Three main metals: iron, magnesium, and chromium are present in a sample of chromite. Chromite is iron magnesium chromium oxide. It is a mineral ore which is used for a variety of procedures including the production of stainless steel and other alloys. Chromite enhances the hardenability and resistance to corrosion of its alloys. The purpose of this experiment is to figure out if the metals iron, magnesium, and chromium are present in an unknown gram sample by using chemical techniques such as hydrometallurgy, extraction, absorption spectroscopy (spectrophotometry) and emission analysis. Hydrometallurgy utilizes aqueous solution chemistry for the recovery of metals from salts, minerals, and ores. Extraction is the process of removing metals from the ore by dissolving the metal in a suitable solvent, recovering the metal from the solution and discarding waste materials. Absorption spectroscopy is the process of metal ions absorbing a wavelength of light. Emission spectroscopy is the process of metal ions emitting a wavelength of light. Thus, the metals in the gram sample can be determined by the process of chemical procedures. By gathering the knowledge of previous chemistry techniques used in earlier experiments, the principles can be applied in this experiment. Reaction stoichiometry and techniques of chemical reactions can be used for the completion of this experiment. Stoichiometry is the process of determining the amount of moles and grams of reactants and products after the setup of a chemical equation. Using chemical reaction procedures involves the use of combining different substances with each other to formulate a specific
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type chemical reaction. In order to find the precipitate of one metal, certain measures have to be taken to distinguish the correct metal. Therefore, when combining substances of different solutions, a variety of effects might happen. In this experiment, when mixing the unknown sample with an acid or a base, precipitates’ will form for a certain metal. But, figuring out and experimenting with the different solutions is required to determine if the sample is actually a chromite sample. The formation of precipitates and the dissolving of precipitates after solutions have been mixed from specific known substances will help determine the products and their chemical formulas. By distinguishing if the metal is amphoteric or not will help the determination of the ions in the sample. Amphoterism is the ability of an ion to react strongly with either an acid or a base. Usually, the ion precipitates in an acidic solution and dissolves in a basic solution. Chromium and zinc are amphoteric metals. By knowing this fact, one will be able to determine the chemical properties of the metals and
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This note was uploaded on 02/13/2010 for the course CHEM 1211L taught by Professor Stanton during the Spring '08 term at UGA.

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experiment 29-4 - Hydrometallurgy to Analyze a Chromite...

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