SU1296618A1 - Method for extracting bismuth from metal-containing solutions - Google Patents

Abstract

This invention relates to methods for extracting bismuth from metal-containing solutions and can be used to separate and concentrate bismuth from aqueous solutions. The purpose of the invention is to improve the sanitary conditions of the process. Bismuth is extracted by extraction from metal-containing solutions by introducing tartrate ions, Trilon B, sodium hydroxide to a concentration of 1.5-2.5 M in solution and sodium ethyldithiocarbamate to a solution, then removing the impurities of metals with chloroform and, prior to the extraction of bismuth, alkaline solution first converted into acetic acid, and then ammonium converted. 1 tab. (Ls

Description

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This invention relates to the extraction recovery of bismuth from a metal containing solutions and can be used to separate and concentrate bismuth from aqueous solutions.

The aim of the invention is to improve the sanitary conditions of the process,

Example 1. In a separating funnel, 10 ml of a solution containing μg: bismuth 400, iron 4000, copper 4000, antimony 1000, tin 1000 and silver 500 are added 5 ml of a 20% sodium tartrate (potassium) solution. 10 ml of the two-water Trilonab solution, 2 drops of O, 1% solution of cresol red, and neutralized with 8 mol of sodium hydroxide solution until the red or yellow color turns pink. B neutralized solution is added with 10 ml of a 6-molar solution of sodium hydroxide, 3 ml of a 1% aqueous solution of sodium diethyldithiocarbamate and water to 40 ml of the solution and 10 ml of chloroform. The contents of the funnel were shaken for 1 minute and after separation of the layers the organic layer was drained. Another 2 ml of 1% sodium diethyldithiocarbamate solution is poured into the funnel and the extraction of metal impurities with 10 ml chloroform is repeated. The alkaline solution is neutralized with acetic acid until the pink color of the solution turns yellow, then with ammonia before the color changes to pink again and another 2 l of excess ammonia is added. 3 ml of 1% sodium diethyldithiocarbamate solution, 10 ml of chloroform are poured into the ammonia solution. The contents of the funnel were shaken for 1 minute and, after separation of the layers, the extract was filtered through glass wool with 1-2 anhydrous sodium sulfate. Another 2 ml of 1% sodium diethyldithiocarbamate solution, 5 ml of chloroform is added to the funnel, shaken for 30-40 seconds and after separation of the layers the organic layer is also filtered through sodium sulfate and glass wool, through which 2 ml of chloroform is then passed.

The amount of bismuth extracted in the extract is determined by the known photometric thiourea method. The recovery rate is 400 kg bismuth at 1.5 M sodium hydroxide concentration in the solution before separation.

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The formation of metal impurities was 100%.

Example2 10 ml of a solution containing mcg: bismuth 2, iron 10000, copper 4000, antimony 1000, sulfur brom 500, zinc 10000 and lead 100000 are poured into the separatory funnel and the process is carried out as in Example 1 with the difference that they take 10 molar sodium hydroxide solution i.e. A 2.5 M sodium hydroxide solution is created to separate the metal impurities.

Bismuth in the extract is determined by a known x-ray method. The recovery rate of 2 µg of bismuth was 100%.

PRI and MER 3. A sample of lead concentrate is decomposed in a known manner and a solution is obtained containing µg: bismuth 260, iron 10780, silver 258, copper 200, zinc 20940, lead 114460. The process is carried out as in Example 1 with the difference that an 8-molar solution of sodium hydroxide is taken, i.e. a 2 M sodium hydroxide solution is created to separate the metal impurities.

Bismuth in the extract is determined by a known x-ray method. The recovery rate of 260 µg bismuth in this example was 100%.

The results of the experiments to assess the effect of the concentration of sodium hydroxide in the solution in the separation of metal impurities on the degree of bismuth extraction are shown in the table,

At concentrations of sodium hydroxide less than 1.5 M and more than 2.5 M, as well as when the content in the initial bismuth solution is less than 2 µg and more than 400 µg, the degree of extraction of bismuth becomes less than 95%.

The use of the invention makes it possible to exclude highly toxic potassium cyanide from applications in the analysis methods and thereby to provide the opportunity for a wider distribution of express and sensitive extraction-X-ray spectral analysis methods in the analytical control of technological products and in research.

Claims (1)

The invention of the method of extraction of bismuth extraction from metal-containing solutions, including the introduction into the solution of tartr 3112666184 ions, Trilon B, sodium hydroxide inatri are introduced to its sodium diethylcarbamate concentration followed by 1.5-2.5 M in solution, separated by viscimetric dimethyldiabiobamate extraction by viscous metals by chloroform mute extraction with chloroform, which is different, and before the extraction of bismuth alkaline Since, in order to improve the solution of the solution, the hydroxide, acetic acid, and then ammonia is transferred first under the nitrite conditions of the process. Solution containing mcg: iron 4000, tin 1000 and silver 500 At 1 M NaOH copper h000, antimony 1000, Solution containing μg: iron 10000, copper 4000, antimony 1000, silver 500, zinc 10000, lead 100000, with 10 M NaOH 0,220,32100 0.550.65,100 1,0101,010 100 2,0201,919 95.0 Solution after decomposition of the lead concentrate sample Content, µg: iron 10780, silver 258, copper 200, zinc 20940, lead 114460, at 8 M NaOH 26.0260 26.2 260100 26.0260 27.4 260100 Content, mcg: iron 1870, silver 87, copper 100, zinc 4730 and lead 74500, with 8 M NaOH