Method for the selective extraction of molybdenum and bismuth

 

(57) Abstract:

The invention relates to the production of highly pure compounds molybdenum and bismuth from various raw materials. In the method for the selective extraction of molybdenum and bismuth conduct leaching of molybdenum and bismuth chloride solutions, sorption of bismuth on the anion exchange resin, the desorption of bismuth. Before adsorption of bismuth spend the sorption of molybdenum and other heavy metals in phosphate-acidic cation exchanger at pH 0.0 to 0.5, and the correlation of phases V:V=1:4-1:10 for 4-8 h, followed by selective desorption of molybdenum with obtaining a purified solution containing the molybdenum, and the selection of the obtained solutions of high-purity compounds molybdenum and bismuth. The method allows to increase the selectivity of the extraction of molybdenum and bismuth, and the degree of their purity. table 1.

The inventive method relates to a hydrometallurgical rare metals, particularly molybdenum and others. Most effectively the inventive method can be used to obtain highly pure compounds molybdenum and bismuth from various raw materials.

Known methods hydrometallurgical extraction of rare metals and bismuth from copper-bismuth concentrates and middlings residual high extraction of molybdenum and bismuth into finished products, as well as low quality connections.

The closest in technical essence and the achieved result of the claimed method is a method of extraction of molybdenum and bismuth from copper-bismuth concentrates, including leaching of bismuth chloride solutions, sorption of bismuth, followed by purification from impurities, desorption of bismuth, the precipitation of basic bismuth nitrate and calcination [3]. According to this method to remove impurities accompanying metals, including molybdenum, after adsorption of bismuth anion exchange resin washed first with 0.2 to 0.5 N. hydrochloric acid and then with water.

The disadvantages of this method are the low degree of separation from molybdenum and impurities, insufficient extraction of molybdenum and bismuth into finished products, low quality molybdenum and bismuth products.

The technical result is to increase the selectivity of the extraction of molybdenum and bismuth and their purity. This technical result is achieved by a method for the selective extraction of molybdenum and bismuth conduct leaching of molybdenum and bismuth chloride solutions, sorption of bismuth on the anion exchange resin, desorption bismuth, according to the second cation exchanger at a pH of 0.0 to 0.5, the correlation of phases Vsolution:Vcation-exchange= 1:4-1:10 for 4-8 hours, followed by selective desorption of molybdenum with obtaining a purified solution containing the molybdenum, and the selection of the obtained solutions of high-purity compounds molybdenum and bismuth.

At a pH of more than 0.5 is not reached the necessary degree of purification from impurities, and reduces the degree of extraction of molybdenum and bismuth in the finished product. The lower bound pH of 0.0 is determined by the savings of acid. When the ratio of phases Vsolution:Vcation-exchangemore than 1:10 is not achieved cleaning solution from impurities, and reduces the content of molybdenum and bismuth in the finished product. The lower limit of the ratio of the phases Vsolution:Vcation-exchangeless than 1:4 is determined by the savings of the cation. When the duration of the process of sorption of molybdenum and related metals less than 4 hours not achieved the necessary degree of purification from impurities and low extraction of molybdenum and bismuth in the finished product. The upper bound of the length more than 8 hours determined by the economy of the process.

This method allows to increase the degree of separation and recovery of molybdenum and bismuth in the finished products and their purity.

The way re is about electrometallurgical plant, containing in %: Bi 3,9; Pb 12,4; Mo 15,5; Zn 23,3; Fe 7,2, videlacele 2M solution of hydrochloric acid in the presence of an oxidant (HNO3) at a ratio of T:W = 1:3 for 2 hours. After leaching the content of the main components in the filtrate were, g/l: Bi 2,9; Mo 15,6; Pb 0,85; Zn 12,7; Fe 5,3; HCl 18,3 (pH 0,16). The resulting solution was subjected to extraction of molybdenum and related heavy metals by sorption on the phosphate cation exchanger SF-5 column volume of 100 ml at a pH of 0.16, the correlation of phases Vsolution: Vcation-exchange= 1:4 for 4 hours. Desorption of molybdenum with saturated cation exchange resin was performed 10% ammonia solution. From the resulting solution containing 70 g/l of molybdenum, known methods received net paramolybdate ammonium, corresponding to the requirements of the applicable SPECIFICATIONS.

Purified from molybdenum and bismuth impurities, the solution was deployed on the sorption of bismuth on the anion exchange resin EP-1P. Desorption of bismuth spent 5 N. a solution of nitric acid at a speed bandwidth solution of 3 volume the volume of ion exchanger per hour. Of marketable fractions of the eluate was besieged basic bismuth nitrate, which was progulivali at a temperature of 650oC to remove oxides of nitrogen. The quality of the salt obtained above qualifications THE CHP 6-09-4310-76. Parallel wiring is the result of the conducted experiments, that sorption of molybdenum and other heavy metals on the phosphate cation exchanger reduces the content of impurities in the oxide of bismuth to molybdenum 60%; lead, 20% iron 10% and receive oxide of bismuth containing 99.7% of Bi2O3after melting which received highly pure metallic bismuth containing more than 99.99% bismuth and suitable for use in the synthesis of high-temperature superconducting materials (HTSC) materials. An additional advantage of the proposed method is associated obtaining pure compounds of molybdenum, which increases the economic performance of the extraction process bismuth.

Thus, the implementation of the inventive method can provide a high degree of separation and recovery of molybdenum and bismuth, increase the yield of molybdenum and bismuth into finished products, which gives the possibility to use the highly pure bismuth compounds in the synthesis of HTS materials, as well as provides associated obtaining pure compounds of molybdenum.

LITERATURE

1. Chazova L. A., Glazkov, E. N., Osintsev S. A. and other Semi-industrial tests hydrometallurgy processing copper-visahow concentrates - ferrous metals, 1966, N to Science, Alma-ATA, 1973, S. 153.

3. Kiselev, S. P., Shevrin, N., Krotov Century. And. Hydrometallurgical processing of copper-bismuth concentrates with obtaining salts of bismuth - ferrous metals, 1981, N 6, S. 19-21.

Method for the selective extraction of molybdenum and bismuth from various raw materials, including leaching of chloride solutions, sorption of bismuth on the anion exchange resin, the desorption of bismuth, characterized in that before the sorption of bismuth spend the sorption of molybdenum and other heavy metals in phosphate-acidic cation exchanger at pH 0.0 to 0.5, and the ratio of the phases V solution : V cation exchange resin = 1 : 4 to 1 : 10 for 4 - 8 h, followed by selective desorption of molybdenum with obtaining a purified solution containing the molybdenum, and the selection of the obtained solutions of high-purity compounds molybdenum and bismuth.

 

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