Impurity removing refining process of high pure bismuth

A high-purity and technological technology, applied in the field of high-purity bismuth removal and refining process, can solve the problems of reducing the recovery amount and recovery rate of bismuth refining, slowing down the diffusion speed, removing unfavorable impurities, etc. The effect of large contact area and improving bismuth recovery rate

Active Publication Date: 2007-05-02
CHENZHOU YUTENG CHEM IND
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Problems solved by technology

[0007] This method has following shortcoming in practice: (1), above-mentioned reaction is gas-liquid reaction, and its speed of reaction is restricted by the contact area of ​​chlorine gas and bismuth liquid, therefore, the impurity removal time is longer, especially in the lead removal later stage, lead is in Concentration reduction and diffusion speed slow down in the bismuth liquid, which is not conducive to removing impurities as soon as possible; (2), impurities such as chlorine remain after the bismuth liquid is refined and need further alka

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  • Impurity removing refining process of high pure bismuth

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Embodiment Construction

[0015] Below in conjunction with the production process flowchart of accompanying drawing, the present invention will be described in detail with specific embodiment:

[0016] The production process flow chart of the accompanying drawing describes a high-purity bismuth impurity removal and refining process, and its rough bismuth is produced according to the following process: first, smelting bismuth, magnesium, calcium, lead scum or leaching slag is put into a reverberatory furnace Heating, freeing lead, extracting crude lead; then putting the deleaded slag into the ash blowing furnace, adding molten sodium hydroxide at a temperature of 400°C, melting and heating to 900°C, blowing in and stirring with oxygen-enriched air melt, and then remove the alkali slag to produce coarse bismuth containing more than 70% bismuth.

[0017] Its high-purity bismuth is produced according to the following process: melt the crude bismuth prepared above and raise the temperature to 680-720°C, add...

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Abstract

This invention relates to an electrolysis technique of ore magma of fluorosilicic acid of bismuth mine. Bismuth concentrate is used as raw material of ore magma to enter into slurry tank, after slurry and add chlorhydric acid to adjust acid, the above-mentioned serofluid is consecutively added into electrolyte tank of ore magma, extraction and electroextraction of bismuth are completed simultaneously by effect that electrolyte tank is imported direct current, cathode that has electrolysed scorifys bismuth powder falling on bottom of membrane bag with sponginess, spongio-bismuth is pressed into pressure filter of spongio-bismuth by equipment of drawing powder and spongio-bismuth is pressed to be block and dewatered, smelted to metallic crude bismuth, hypso-pure bismuth of which the final content is 99.999% is epurated by importing chlorine gas, natrium hydroxydatum to eliminate miscellaneous object.

Description

technical field [0001] The invention relates to a process for removing impurities and refining high-purity bismuth, and belongs to the technical field of pyrometallurgy of nonferrous metals. Background technique [0002] Bismuth is in group 5 of the periodic table, its chemical atomic weight is 208.9804, and the outer electron is 6S 2 6P 3 , usually shown as +3 valence and +5 valence, and in a few cases it is shown as +2 valence, +1 valence, -3 valence and -1 valence; metal bismuth is a silver-gray shiny solid, brittle, easy to break, and hard. The specific gravity is 9.78, soluble in dilute HNO 3 , hot H 2 SO 4 and concentrated hydrochloric acid. [0003] Bismuth is a rare metal with very little stock in nature. Most of it coexists with lead, tungsten and molybdenum deposits, and it has no mining value itself. In industry, it is mainly recovered from the by-products of lead-zinc mines and copper mines, and bismuth can also be recovered from tin mines. The crude bismu...

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Application Information

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IPC IPC(8): C22B30/06C22B9/10
Inventor 李进新
Owner CHENZHOU YUTENG CHEM IND
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