Method for separating molybdenum and rhenium through extracting under acidic condition

An acid condition and extraction technology, applied in the field of hydrometallurgy of molybdenum and rhenium, can solve the problems of long process flow, time-consuming and laborious, complicated operation, etc., and achieve the effect of short process flow, cost reduction and simple operation.

Active Publication Date: 2018-12-21
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The extraction method has been widely used in the hydrometallurgy of molybdenite because of its good selectivity, large production capacity and low cost, especially for the separation and recovery of molybdenum and rhenium from the mother liquor of decomposed molybdenite. Generally, a low-concentration amine extractant (such as N 235 , Alamine336, Alamine304, trioctylamine and tridecylamine, etc.) to extract rhenium, and then use high-concentration amine extractant to extract molybdenum, but in the process of extraction, the metal cations in the mother liquor (such as Fe 3+ 、Cu 2+ etc.) are easy to enter the organic phase, and generally need to be washed to remove Fe 3+ 、Cu 2+ and other impurities, the process is long, the operation is complicated, time-consuming and labor-intensive

Method used

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  • Method for separating molybdenum and rhenium through extracting under acidic condition
  • Method for separating molybdenum and rhenium through extracting under acidic condition

Examples

Experimental program
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Effect test

Embodiment 1

[0024] In this embodiment, the concentrated solution after acid precipitation treatment by POX process is the mother liquor, the content of molybdenum is 4.02g / L, and the content of rhenium is 0.03g / L;

[0025] (1) Adjust the pH value of the mother liquor to 2.0 with sulfuric acid, add the extractant I to the mother liquor at a ratio (O / A) of 2 / 1, fully contact at 25°C for 25 minutes, and molybdenum is extracted into the organic phase to obtain loaded molybdenum The organic phase of the molybdenum was named molybdenum sample Ⅰ, and the rhenium was left in the raffinate; the molybdenum-loaded organic phase was mixed with NH 3 Ammonia water with a mass fraction of 20% is mixed for stripping, the ratio (O / A) is 3 / 2, fully contacted at 25°C for 5 minutes, and molybdenum is stripped into the water phase to obtain ammonium molybdate solution, which is named stripping molybdenum Sample I: The organic phase after stripping is directly returned to the extraction for reuse;

[0026] Th...

Embodiment 2

[0030] In this embodiment, the concentrated solution after acid precipitation treatment by POX process is the mother liquor, the content of molybdenum is 1.52g / L, and the content of rhenium is 0.01g / L;

[0031] (1) Adjust the pH value of the mother liquor to 1.9 with sulfuric acid, add the extractant I to the mother liquor at a ratio (O / A) of 2 / 1, fully contact at 25°C for 30 minutes, and molybdenum is extracted into the organic phase to obtain loaded molybdenum The organic phase of the molybdenum was named molybdenum sample II, and the rhenium was left in the raffinate; the organic phase loaded with molybdenum was mixed with NH 3 Ammonia water with a mass fraction of 15% is mixed for stripping, the ratio (O / A) is 3 / 2, fully contacted at 25°C for 4 minutes, and molybdenum is stripped into the water phase to obtain ammonium molybdate solution, which is named stripping molybdenum Sample II: the organic phase after stripping is directly returned to the extraction for reuse;

[0...

Embodiment 3

[0036] In this embodiment, the concentrated solution after acid precipitation treatment by POX process is the mother liquor, the content of molybdenum is 10g / L, and the content of rhenium is 0.1g / L;

[0037](1) Adjust the pH value of the mother liquor to 2.1 with sulfuric acid, add the extractant I to the mother liquor at a ratio (O / A) of 2 / 1, fully contact at 25°C for 25 minutes, and molybdenum is extracted into the organic phase to obtain molybdenum-containing The organic phase of the molybdenum was named molybdenum sample III, and the rhenium was left in the raffinate; the organic phase loaded with molybdenum was mixed with NH 3 Ammonia water with a mass fraction of 20% is mixed for stripping, the ratio (O / A) is 3 / 2, fully contacted at 25°C for 5 minutes, and molybdenum is stripped into the water phase to obtain ammonium molybdate solution, which is named stripping molybdenum Sample III: The organic phase after stripping is directly returned to the extraction for reuse;

...

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Abstract

The invention discloses a method for separating molybdenum and rhenium through extracting under the acidic condition. The method comprises the following steps that (1) the pH value of mother liquid isadjusted, an extraction agent I and the mother liquid are evenly mixed and subjected to standing to be separated, molybdenum is extracted into an organic phase, rhenium is left in extraction raffinate, the organic phase loaded with molybdenum is subjected to reverse extraction through an alkaline reverse extraction agent I, and a molybdate solution is obtained; and (2) the pH value of the extraction raffinate obtained by extracting molybdenum is adjusted, the extraction raffinate and an extraction agent II are mixed and subjected to standing to be separated, rhenium is extracted into an organic phase, the organic phase loaded with rhenium is subjected to reverse extraction through an alkaline reverse extraction agent II, and a rhenate solution is obtained. According to the method, by adjusting the pH value of the solutions, the organic phase loaded with molybdenum and the organic phase loaded with rhenium can be obtained through extraction, washing and impurity removing are not needed, after reverse extraction through the alkaline reverse extraction agents, the high-purity molybdate solution and the high-purity rhenate solution are obtained, the technological process is short, operation is easy, and the wide application prospects are achieved.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy of molybdenum and rhenium, and in particular relates to a method for extracting and separating molybdenum and rhenium under acidic conditions. Background technique [0002] Both molybdenum and rhenium are rare precious metals, which have broad application prospects in industry: molybdenum and its compounds are widely used in steel, metal processing, electrical, metallurgy, building materials, machinery, petroleum, anti-corrosion, pigments, agriculture, military and other industries. Application: Rhenium and its compounds have excellent characteristics and catalytic properties, and are widely used in aviation, aerospace, medicine and catalysts and other fields. There are about 20 kinds of molybdenum ores that have been discovered so far. The ones with industrial value mainly include molybdenite, calcium molybdate ore, iron molybdate and lead molybdate ore, among which molybdenite is the mos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/40C22B34/34C22B61/00
CPCC22B34/34C22B61/00C22B3/409Y02P10/20
Inventor 勾明雷牛青山魏学锋彭淑鸽韩新义韩新付
Owner HENAN UNIV OF SCI & TECH
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