A method for selectively recovering rhenium from high-arsenic waste acid system

A selective and systematic technology, applied in the direction of improving process efficiency, etc., can solve the problems of poor selective extraction performance and low separation rate of rhenium and arsenic, and achieve the effects of low cost, simple process flow and less washing wastewater

Active Publication Date: 2021-08-31
CHANGSHA RES INST OF MINING & METALLURGY
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  • Abstract
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Problems solved by technology

The extraction method is a relatively mature method for separating and enriching rhenium. The conventional extraction and recovery process uses the mixed organic phase of N235, 2-octanol, and 260# solvent oil as the extraction agent. After multi-stage centrifugal extraction, back extraction, concentration, Ammonium rhenate products are obtained after crystallization. For example, Tongling Nonferrous Metals adopts this method to recover rhenium in copper smelting waste acid. However, in the process of extracting rhenium, a large amount of impurity metal arsenic enters the loaded organic phase with rhenium, and tap water needs to be used as a detergent to remove it. In addition to the impurity metal As in the loaded organic phase, the selective extraction performance of rhenium is poor, and the separation rate of rhenium and arsenic is low

Method used

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  • A method for selectively recovering rhenium from high-arsenic waste acid system

Examples

Experimental program
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Effect test

Embodiment 1

[0026] A method for selectively recovering rhenium from a high-arsenic waste acid system containing H + 0.38mol / L, As6.62g / L, Fe 39.08mg / L, Pb 17.22mg / L, Zn 271.75mg / L, Re 42.5ug / L, Cl - 1.97g / L, F - 0.1g / L,SO 4 2- 13.64g / L, including the following steps:

[0027] Using a mixed extractant to directly extract high-arsenic waste acid to obtain a rhenium-rich organic phase; the mixed extractant includes trioctylamine, N1923, isoamyl alcohol and sulfonated kerosene, the quality of trioctylamine, N1923, isoamyl alcohol and sulfonated kerosene The percentages are 10%, 4%, 18% and 68% respectively; during extraction, O / A=1:2, extraction time 10min, single-stage extraction, room temperature. It is determined that in this step, the extraction rate of rhenium is 99.2%, and the separation rate of rhenium and arsenic is 99.46%.

[0028] In this embodiment, the separation rate of rhenium and arsenic is (1-(the amount of arsenic in the collected rhenium material / the amount of arsenic i...

Embodiment 2

[0030] Compared with Example 1, this example differs in that sodium hyposulfite is added to the high-arsenic waste acid before using the mixed extractant to extract the high-arsenic waste acid, and the amount of sodium hyposulfite added is 1.1 times the theoretical amount for reducing arsenic.

[0031] It is determined that in this step, the extraction rate of rhenium is 99.2%, and the separation rate of rhenium and arsenic is 99.78%.

Embodiment 3

[0033] A method for selectively recovering rhenium from a high-arsenic waste acid system containing H + 0.52mol / L, As6.25g / L, Fe 41.2mg / L, Pb 17.32mg / L, Zn 255.6mg / L, Re 287.1ug / L, Cl - 2.7g / L, F - 0.13g / L,SO 4 2- 16.64g / L, including the following steps:

[0034] Using a mixed extractant to directly extract high-arsenic waste acid to obtain a rhenium-rich organic phase; the mixed extractant includes trioctylamine, N1923, isoamyl alcohol and sulfonated kerosene, the quality of trioctylamine, N1923, isoamyl alcohol and sulfonated kerosene The percentages are 14%, 5%, 12% and 69% respectively; during extraction, O / A=1:2, extraction time 10min, three-stage extraction, normal temperature. It is determined that in this step, the extraction rate of rhenium is 99.61%, and the separation rate of rhenium and arsenic iron is 100%.

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Abstract

The invention discloses a method for selectively recovering rhenium from a high-arsenic waste acid system, which comprises the following steps: (1) using a mixed extractant to extract high-arsenic waste acid to obtain an organic phase rich in rhenium; the mixed extractant Including trioctylamine, N1923, isoamyl alcohol and sulfonated kerosene, the mass proportions of trioctylamine, N1923, isoamyl alcohol and sulfonated kerosene are respectively 8‑25%, 2‑5%, 10‑20 % and 50-80%; (2) washing the rhenium-rich organic phase obtained in the step (1) with water, then back-extracting with a back-extraction agent, and collecting the back-extraction solution is the rhenium enrichment solution. The invention adopts the optimized mixed extractant to extract high-arsenic waste acid, the mixed extractant has good selective extraction of rhenium, the product rhenium compound has higher purity, does not require a large number of subsequent purification operations, and the amount of washing wastewater is less.

Description

technical field [0001] The invention belongs to the field of hydrometallurgical resource recovery, in particular to a method for recovering valuable metals from high-arsenic waste acid systems. Background technique [0002] The high-arsenic waste acid system is generally the waste acid produced in the acid production process of non-ferrous metal pyrometallurgy flue gas, which contains not only copper, cadmium, zinc, arsenic, fluorine, chlorine and sulfate ions, but also some of which contain high-value rhenium . Due to the complex composition of smelting raw materials, the content of rhenium in waste acid varies from tens of micrograms to tens of milligrams. [0003] At present, the methods for recovering rhenium from waste acid in my country mainly include: sulfuration precipitation method, ion exchange method and extraction method. The sulfidation precipitation method makes rhenium precipitate into the slag for enrichment by adding a sulfide agent. This method is only su...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B3/40C22B61/00
CPCC22B7/006C22B61/00C22B3/402Y02P10/20
Inventor 雷湘曾娟余侃萍刘孟李义伟魏来李立张玉凤
Owner CHANGSHA RES INST OF MINING & METALLURGY
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