Electrolytic,process,prepare,b business, insurance Electrolytic process to prepare boron powder
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The preparation of theelement boron is magnesium thermal reduction initially, still the preferredmethod for large scale preparation of boron powder by metal powder supplier.Amorphous boron powder is mainly used as metallurgical deoxidizer, solid rocketfuel, as well as automotive airbag initiator agent. With the development ofelectronic industry, high-purity boron powder is widely used as a semiconductordopant.The preparation method of the element boronin addition to magnesium thermal reduction method, there are the thermaldegradation method, the reduction method of the sodium hydride, boron halidedecomposition method, molten salt electrolysis method, etc. Molten saltelectrolysis method was considered to be one of the most promising methods. It withhigh purity of the product, the product is not magnesium and simple process. Scientistshave done a lot of research work.. In 1925, the scientists studied the borontrioxide dissolved in various molten salt, molten salt electrolysis prepared bythe method of boron powder. In 1949, someone use potassium chloride - potassiumfluoroborate system electrolytically prepared 99.51% purity boron powder.Thereafter, the molten salt system of potassium fluoride, potassium hydrogenfluoride, potassium chloride, boron oxide, a fluorine potassium borate basedbecome a boron powder is the main component of the molten salt electrolysismethod, In addition to these, borax, boric acid, boron carbide, borontrichloride has been applied to the molten salt electrolysis prepared boronpowder.The device of molten salt electrolysis isprepared boron powder electrolyzer. Due to the high reactivity of the borides,only graphite can be applied to this in the existing materials. Theelectrolyzers are made of graphite. Cathode commonly used iron electrode alsouseful, Monel steel electrode corrosion resistance than iron: anode usinggraphite crucible. Electrolytic power supply with DC voltage, a general in 2.5-3-8.0volts. The outside of the graphite crucible was heated by an electric furnace,so that the internal molten salt melt, most of the temperature of the system is650 to 900 ° C. Due to the poor oxidation resistance of graphite, need to passinto the inert gas to prevent the crucible oxidative damage. Electrolysisprecipitated boron mostly adhered to the iron on the cathode in theelectrolysis is completed, the force can be peeled off. Will remove the boronpowder into the boiling dilute hydrochloric acid, to wash away the buildup ofmolten salt, it can be obtained elemental boron powder.The device is the biggest problemconstraints electrolysis boron powder. Different from electrolytic aluminum,electrolytic boron powder is difficultto achieve continuous production, because when the electrolysis to a certainextent, the composition of the molten salt electrolyte irreversible changeoccurs, this time only to stop the electrolytic process, and then re-loadedinto the material begins electrolysis. Continuous problem not solved make thisapproach is unlikely to achieve industrial scale production. In an improvedmethod, using a strange idea to solve the carbon residue, which is currentlythe only viable method. Normal electrolysis process, a graphite crucible as theanode and iron as the cathode, and the boron powder adhered to the iron on thecathode, but in this method, initially iron used as the anode, graphite as acathode, so that the resulting boron power is deposited on the inner wall ofthe graphite crucible, play the role of the carbon shield. Then, after acertain time in the electrolysis, the anode reversed, coming graphite crucibleas the anode, iron as the cathode, so that the boron powder adhered on theinner wall of the graphite crucible is transferred to the iron on the cathode,thereby obtaining a relatively high purity boron powder.Source:http://www.mhcmp.com
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