SU1468947A1 - Method of recovering vanadium from hydrochloric solutions - Google Patents

Abstract

The invention relates to rare metals, in particular to methods for extracting vanadium pentoxide. The purpose of the invention is to reduce the consumption of reagents. When vanadium is extracted from hydrochloric acid solutions, it is precipitated using isododecyl alcohol as an organic reagent, taken from COOTHO-t with vanadium in the initial solution 0.01-0.04: 1.0. 1 tab.

Description

The invention relates to rare metals, in particular, to methods for the extraction of vanadium pentoxide ().

The purpose of the invention is to reduce reagent consumption.

Example 1. To a 1000 MP hydrochloric acid solution containing 40 g / l of vanadium and a pH of 1.0, 1.45 g of isododecyl alcohol (IDA) was added, the ratio of IDA 0.01: 1. Under stirring and at a temperature of VO-SOO S, the mixture was stirred for 1 h. Then, the precipitate obtained was filtered, dried by air and subjected to thermal decomposition at 550 C.

As a result of the experiment, vanadium pentoxide of 71.0 g and 930 ml of mother liquor containing 0.18 g / l of vanadium were obtained, the degree of emission of vanadium in the sediment was 99.5%.

Thus, the consumption of organic reagent isododecyl alcohol to separate vanadium from acidic

solutions in the proposed method (0.065 kg IDS per 1 kg 5) is 17.7 times less than in the known (consumption of aliphatic amine per 1 kg. on average 1.15 kg). In addition, in the proposed method, in comparison with the known, the hydroxide or carbonate of alkali or alkaline-green metals is not used.

Example 2. To 1000 ml of a hydrochloric acid solution containing 38 g / l of vanadium and a pH of 1.2, 4.15 g of isododecyl alcohol (IDS) was added, the ratio of IDS: 0.03: 1. The mixture was kept under stirring and the temperature was kept for 1 h. Next, the precipitate obtained was filtered, dried on the substrate and subjected to thermal decomposition at 550 ° C.

As a result of the experiment, 67.23 g and 930 MP of the stock solution containing 0.21 g / l of vanadium were obtained; the degree of vanadium precipitation in the sediment was 99.4%.

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Thus, the consumption of organic reagent in the proposed method (0.195 kg of VAT per 1 kg) is 5.89 az less than in the known (the consumption of mine per 1 kg of V2.0j is on average 1.15 kg). In addition, in the method proposed, in comparison with the known method, the 1ShOD hydroxide of alkali or alkaline earth metals is not used.

Example 3. To 1000 ml of hydrochloric acid solution containing D5 g / l of vanadium and pH 0.7, 6.56 g of isododecyl alcohol were added (HflC: V ratio 0.04: 1). Under stirring and a temperature of 95 ° C, the mixture was kept for 1 h. Next, the resulting precipitate was filtered, dried in air, and subjected to thermal decomposition at.

As a result of the experiment, 79.69 g and 920 mp of the mother liquor containing 0.21 g / l of vanadium were obtained; the degree of vanadium precipitation in the sediment was 99.5%.

Thus, the consumption of organic reagent in the proposed method (0.26 kg of VAT per 1 kg of ViOs) is 4.42 times less than in the known method (the consumption of amine per 1 kg is on average 1.15 kg). In addition, in the proposed method, in comparison with the known method, alkali or alkaline earth metal hydroxide or carbonate is not used.

Example 4. To 1000 ml of a hydrochloric acid solution containing 40 g / l of vanadium and a pH of 1.2, 1.16 g of isododecyl alcohol was added (the ratio of IDS: Y = 0.008: 1). With stirring and kept the mixture for 1 hour. Then, the resulting precipitate was filtered, dried in air and subjected to thermal decomposition at 550 C. As a result of the experiment, 60.52 g of ViOg and 930 MP of the mother liquor containing g / l vanadium were obtained, the degree of vanadium precipitation amounted to 85.0%. Thus, reducing the consumption of isododel alcohol at its ratio to vanadium less than 0.01: 1 leads to a scientific degree of vanadium precipitation and loss of vanadium with the mother liquor.

Example 5. To 1000 ml of a hydrochloric acid solution containing 38 g / l of vanadium and pH “t, 0, was added 8.31 g

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five

40

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50

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isododecyl alcohol (VAT: V ratio of 0.06: 1).

Under stirring and at a temperature of 90 ° C, the mixture was kept for 1 h. Next, the resulting precipitate was filtered, dried in air and subjected to thermal decomposition at.

As a result of the experiment, 67.3 g and 930 MP of the stock solution containing 0.177 g / l of vanadium were obtained, the degree of emission of vanadium in the sediment was 99.5%.

Thus, an increase in the consumption of isododecyl alcohol with its ratio to vanadium of more than 0.04: 1 increases the cost of the product.

The table shows the data on the extraction, the quality of the product.

As can be seen from the table, the degree of vanadium recovery into the sediment according to the proposed and known methods is practically equal.

The quality of the vanadium sediment obtained from the solution after calcination meets the requirements of the specified specifications.

When using isododecyl alcohol j taken when its ratio to vanadium is more than 0.04: 1.0 (at a 99.5% recovery rate equal to that of a known method), the quality of the finished product deteriorates. The content of 5 in the finished product is reduced, since the calcination of a vanadium precipitate containing significant amounts of isododecyl alcohol results in a partial reduction of V to V, which degrades the quality of the finished product to a decrease in V, j05 and an increase in it.

The use of isododecyl alcohol, taken when its ratio to vanadium is less than 0.01: 1, is not enough to bond all vanadium into the complex compound, as a result of which vanadium is not completely separated from the solution into the sediment, which leads to loss of vanadas with the mother liquor .

The method thus makes it possible to reduce the cost of the finished product by reducing the consumption of organic reagent and eliminating the use of alkali and alkaline earth hydroxide or carbonate.

metals, exclude the presence of harmful substances in the mother liquors, since the complexes of isododecyl alcohol with vanadium are practically insoluble.

Claims (1)

Invention Formula A method for extracting vanadium from hydrochloric acid solutions, including precipitation by heating in the presence of organic reagent with semi- Vanadium-containing sediment, separation of the precipitate from the solution and subsequent calcining of the precipitate to obtain the finished product in the form of vanadium oxide (V), characterized in that, in order to reduce the consumption of reagents, the precipitation is carried out using isododecyl alcohol as an organic reagent, in relation to vanadium in the initial solution 0.01 th 200 200 200 200 200 200 40.0 40.0 40.0 40.0 40.0 40.0 14.20 14.20 14.21 14.22 12.60 14.20 99.5 99.5 99.54 99.61 88.2 89.5 1.15 0.020 0.061 0.082 0,010 0.122 56.65 18.85 14.02 115.0 9.42