SU633811A1 - Method of obtaining ammonium paramolybdate - Google Patents

Description

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The invention relates to methods for producing ammonium paramolybdate (PAMA) and can be used to obtain molybcene oxides and other compounds using extraction technology. ..-. ,

Methods are known for producing ammonium paralibdate by re-extraction. molybdenum with a 7-10% aqueous solution of ammonia with a volume ratio of organic and water phases equal to 1O: 1, as well as maintaining the equilibrium pH value of the aqueous phase within 4.8-5, O and the volume ratio of organic and water phases, equal to ZO-5O: I. Transited into the aqueous phase

molybdenum falls out of it in the form of ammonium polymolybdate. This product is converted into ammonium paramolcate by dissolving it with E. ammonia solution, filtering, evaporating the filtrate and separating the crystals from the solution.

However, the known methods are complicated, as it is necessary to carry out labor-intensive operadn to convert ammonium polymolybdate to parimolybdate.

Of the known methods, the closest to the technical essence and the result is a method of obtaining ammonium gshramolibdata from organic extracts containing molybdenum, an aqueous solution of ammonia while maintaining in the equilibrium aqueous phase the concentration of molybdenum 15O-50O g / l, free concentration of ammonia 1-5 g / l and the volume ratio of the organic and aqueous phases, equal to 5O: 1. Under such conditions, solid phase molybdenum reextration proceeds, which is released in the form of ammonium paramolybdate | 3j.

However, with this method, an increased contamination of the final npoajTKTa impurities is observed, and, in addition, a gel-like product is formed and the separation of the phases is difficult.

The purpose of the invention is to increase the purity of the final product and simplify the process.

Claims (1)

This is achieved by the fact that the recovery is carried out at an equilibrium of 5-8.5 and a volume ratio of the organic and aqueous phases from 3: 1 to 1: 3, Example. The molybdenum-saturated aqueous solution is treated with a 15% solution of polyapkylphosphoric nitrate in a hydrocarbon. The initial solution has the following composition, g / l: Molybdenum4.1 Sulfuric acid20,800 Iron0.320 Calcium0.120 Magnesium0.480 Phosphorus0.144 Sodium0.228 Mouse k0.50O, As a result of the extraction of molybdenum, its residual content in the water mixture decreased to 0,005 t / l. The extract obtained is treated with an aqueous solution of ammonia, containing 5% ammonium sulfate, at an equilibrium, and a volume ratio of organic and aqueous phases equal to 1: 2; The pH of the solution is regulated by changing the concentration of ammonia. The volume ratio of the organic aqueous phase in the process of solid э atenestrate is regulated by circulating an aqueous solution. The formed ammonium paramolybdate crystals are easily separated from the solution. The final product contains 0, O001 weight, 0, OOO. W% magnesium weight, 0,002% alci weight, 0, O02% iron weight and 0.04 wt atri. The grain size of the crystals is 80-100 µm. During the reextraction process, ore-separable emulsions are not formed, the separation of PAMA crystals proceeds without complications. Thus, the use of the proposed method allows to improve the quality of the final product and improve the process. Claims method of producing ammonium paramolybdate from organic extracts containing molybdenum, including molybdenum reextraction with aqueous ammonia solution, characterized in that, in order to increase the purity of the final product and simplify the process, reextraction is carried out at an equilibrium, 5-8.5 and volume ratio of organic and water phases from 3: 1 to 1: 3, Sources of information taken into account during the examination: 1. Zelikman A, H, Molybdenum, M ,, 1970, p., 158-174, 2 USSR Author's Certificate N- 396986, cl . C 01 q 39/00, 14,08,72. 3. USSR author's certificate NP 447916, class, C 01 Q 39 / OO, 27.04.73,