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Method for enriching rhenium from copper smelting waste acid

A technology of copper smelting and waste acid, applied in the direction of improving process efficiency, etc., can solve the problems of large reagent consumption, poor extraction selectivity, secondary environmental pollution, etc., achieve effective separation and efficient recovery, mild desorption conditions, and low cost Effect

Active Publication Date: 2017-11-17
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The recovery of rhenium in this process is fast, high in purity, and under mild conditions. However, most of the extraction agents used in the extraction process are amine extractants, which make the extraction selectivity poor, prone to salt formation reactions, and have large extraction capacity, volatile extraction agents, and Large consumption, high processing cost, easy to cause secondary environmental pollution and other problems
[0007] To sum up, the existing technology for recovering rhenium from copper smelting waste acid has disadvantages such as difficulty in extracting low-concentration rhenium, high processing costs, and easy pollution of the environment.

Method used

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  • Method for enriching rhenium from copper smelting waste acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Using the copper smelting waste acid provided by a certain company A as raw material, the inductively coupled plasma emission spectrometer was used to detect that the copper smelting waste acid contained 1260 mg / L of copper, 394 mg / L of arsenic, 604 mg / L of iron, and Rhenium 65 mg / L, containing 79440 mg / L sulfuric acid.

[0028] Add calcium hydroxide and calcium oxide to the sedimentation tank equipped with waste acid from copper smelting in a weight ratio of 4 to 6:1 until the pH of the solution is 8, press filter to separate, and collect the filtrate in the liquid storage tank (pH adjustment tank), pass sulfuric acid into the liquid storage tank to adjust the pH of the filtrate to 5, and pass the rhenium-containing filtrate through the biochar adsorption tower for pretreatment. When the concentration of each interfering ion is less than 5 mg / L, pass the rhenium-containing solution through the copper-loaded biological The carbon adsorption tower absorbs and enriches rh...

Embodiment 2

[0030] Using copper smelting waste acid provided by a company B as raw material, using inductively coupled plasma emission spectrometer to detect, the copper smelting waste acid contained 952 mg / L of copper, 586 mg / L of arsenic, 814 mg / L of iron, and Rhenium 76 mg / L, containing 56870 mg / L sulfuric acid.

[0031] Add calcium hydroxide and calcium oxide to the sedimentation tank equipped with waste acid from copper smelting in a weight ratio of 4 to 6:1 until the pH of the solution is 12, press filter to separate, and collect the filtrate in the liquid storage tank (pH adjustment tank), pass sulfuric acid into the liquid storage tank to adjust the pH of the filtrate to 6, and pass the rhenium-containing filtrate through the biochar adsorption tower for pretreatment, when the concentration of each interfering ion is less than 5 mg / L, pass the rhenium-containing solution through the copper-loaded biochar The adsorption tower absorbs and enriches rhenium, and when the adsorption re...

Embodiment 3

[0033] Using copper smelting waste acid provided by a certain company C as raw material, the inductively coupled plasma emission spectrometer was used to detect that the copper smelting waste acid contained 1380 mg / L of copper, 471 mg / L of arsenic, 985 mg / L of iron, and Rhenium 49 mg / L, containing 58640 mg / L sulfuric acid.

[0034] In the sedimentation tank equipped with waste acid from copper smelting, add a precipitant mixed with calcium hydroxide and calcium oxide in a weight ratio of 4-6:1 until the pH of the solution is 10, separate by pressure filtration, and collect the filtrate in the liquid storage tank (pH adjustment tank), pass sulfuric acid into the storage tank to adjust the pH of the filtrate to 7, and pass the rhenium-containing filtrate through the biochar adsorption tower for pretreatment, when the concentration of each interfering ion is less than 5 mg / L, pass the rhenium-containing solution through the copper-loaded biochar The adsorption tower absorbs and e...

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Abstract

The invention discloses a method for enriching rhenium from copper smelting waste acid. According to the adopted technical schemes, precipitant is added into the copper smelting waste acid containing low-concentration rhenium until pH of a solution is 8-12, filter pressing and separating are conducted, filtrate is collected, the pH is adjusted to 1-8, the filtrate is pretreated through a biological carbon adsorption tower, interfering ions are further removed, then the rhenium in the solution is absorbed through a copper-carrying biological carbon adsorption tower, adsorption is stopped after adsorption reaches saturation, elution with an alkaline liquid and concentration are conducted, and rhenium-containing enrichment liquid is obtained. According to the method for enriching the rhenium from the copper smelting waste acid, technology is reasonable, no-pollution is achieved, the operation condition is mild, the recovery rate is up to over 99%, the maximum adsorption capacity is that 100 mg rhenium can be absorbed by per gram of adsorbent, rhenium enrichment is increased by more than 100 times, and rapid and efficient recovery of the low-concentration rhenium in the copper smelting waste acid can be realized.

Description

technical field [0001] The invention belongs to the field of chemical separation, and in particular relates to a method for enriching rhenium from copper smelting waste acid. Background technique [0002] Independent deposits of rare metal rhenium are very rare, mainly in the form of ReS 2 The form is associated with molybdenite, copper sulfide ore and porphyry copper ore. In copper concentrate, rhenium is mainly copper rhenium ore (CuReS 4 ) and rhenium pyroxene (ReS 2 ) exists in the form of copper ore in the pyrometallurgy process, the vast majority of rhenium is in the form of Re 2 o 7 The form volatilizes into the flue gas, and the rhenium-containing flue gas is pickled by the elution tower, and the rhenium is converted into HReO 4 The form exists in copper smelting waste acid. The spent acid contains 3-30 mg / L of rhenium, and after removing arsenic, heavy metals and neutralization treatment of alkaline substances, most of the rhenium enters the arsenic filter cak...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B61/00
CPCC22B7/006C22B61/00Y02P10/20
Inventor 胡晖孙龙利王涛陈晓晖
Owner FUZHOU UNIV
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