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A method for efficient selective adsorption recovery of rhenium and mercury from multi-component mixed waste acid of copper smelting

A technology of selective adsorption and copper smelting, applied in the direction of improving process efficiency, etc., can solve the problems of difficult production of ammonium rhenate, pollution of rhenium-rich liquid, high toxicity of mercury, etc., and achieve the effects of low cost, easy industrialization, and short process

Active Publication Date: 2021-08-10
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, when the ion exchange method is used to recover rhenium in waste acid in existing studies, basically only the adsorption performance and effect of the target element rhenium are considered, and the influence of mercury is not considered.
Since a small amount of mercury in copper smelting waste acid exists in the form of complex anions, the ion exchange resin will inevitably adsorb part of the complex anions of mercury in the waste acid during the process of adsorbing the target element rhenium, and in the process of analyzing the target element rhenium Part of mercury will also be decomposed together with rhenium, resulting in a certain amount of mercury ions in the rhenium-rich solution, which will pollute the rhenium-rich solution. In the concentrated solution, it is difficult to produce high-purity ammonium rhenate (above 99.9%). On the other hand, the mercury evaporated is highly toxic and becomes a serious pollution source.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] Step 1. Resin pretreatment

[0067] Measure 80ml of D304 type anion exchange resin, pour it into a 200ml beaker, add 80ml of circulating water of copper smelting enterprise, 80ml of tap water respectively, soak and swell at room temperature statically for 15h, pour off the swelling water after swelling, and use circulating water and tap water with a volume ratio of 1 Washing with mixed water of 1:1 to pH=7, adding 200ml of mixed alkali of KOH and ammonia water, wherein the mass concentration of KOH is 0.2%, the concentration of ammonia water is 0.1%, the alkali immersion transformation is 2h, and the resin is washed to pH with circulating water after the transformation is completed = 7.5, use a copper smelting multi-component mixed waste acid in Northwest China to carry out acid leaching transformation for 24 hours, after the transformation is completed, it will not be washed with water, and it will be used directly.

[0068] Step 2. Pretreatment of multiple mixed waste...

Embodiment 2

[0077] Step 1. Resin pretreatment

[0078] Measure 50ml of D304 type anion exchange resin, pour it into a 200ml beaker, add 50ml of tap water and 50ml of demineralized water respectively, soak and swell at room temperature statically for 10 hours, pour off the swelling water after the swelling is completed, wash the resin with tap water until pH = 7, add NaOH and Mixed alkali 100ml of ammonia water, wherein the mass concentration of NaOH is 2.5%, the concentration of ammonia water is 0.5%, the alkali leaching transformation is 5h, after the transformation is completed, the resin is washed to pH=9.0 with tap water, and the mixed acid of 2.5% sulfuric acid and hydrofluoric acid is used (The mass ratio of sulfuric acid and hydrofluoric acid is 9:1) acid leaching transformation for 8 hours, after the transformation, wash with tap water to pH = 5 and set aside.

[0079] Step 2. Pretreatment of multiple mixed waste acids

[0080] Take SO from a copper smelter in Central China 2 Se...

Embodiment 3

[0088] Step 1. Resin pretreatment

[0089] Measure 40ml of D304 anion exchange resin, pour it into a 200ml beaker, add 100ml of demineralized water, soak and swell for 30 hours at room temperature, pour off the swelling water after the swelling is completed, wash the resin with demineralized water until pH = 7, add 8% ammonia water 60ml for alkali Immersion transition 10h, after the transformation is over, use demineralized water to wash the resin to pH=8.5, adopt 3.0% sulfuric acid and hydrochloric acid mixed acid (the mass ratio of sulfuric acid and hydrochloric acid is 9:1) acid leaching transformation for 30h, and the transformation ends and demineralized water washing to pH = 4 and ready to use.

[0090] Step 2. Pretreatment of multiple mixed waste acids

[0091] Take SO from a copper smelter in Southwest China 2 Secondary power wave cooling and purification of 25L of dirty acid, adding amphoteric polyacrylamide flocculant at a rate of one ten thousandth, settling for 2...

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Abstract

The invention discloses a method for efficiently selectively adsorbing and recovering rhenium and mercury from multi-component mixed waste acids of copper smelting, and belongs to the technical field of comprehensive recovery of rare and precious metals. The process steps include pretreatment of resin, pretreatment of multi-component mixed waste acid, synergistic co-adsorption of rhenium and mercury in multi-component mixed waste acid, and analysis of rhenium and mercury in rich resin. The present invention uses weakly basic chelating anion exchange resin to directly and selectively absorb and recover rhenium and mercury from multi-component mixed waste acid of copper smelting, and optimizes the specific process, so that rhenium and mercury in multi-component mixed waste acid can be recovered. Mercury is recovered separately, which effectively improves the recovery effect of rhenium and mercury, realizes the recovery of rare metal rhenium in the copper smelting industry and the enrichment of harmful element mercury, which is beneficial to the subsequent production of rhenium and mercury related products, and its process is simple , short process, high product purity, low pollution, low cost and easy industrialization.

Description

technical field [0001] The invention belongs to the technical field of comprehensive recovery of rare and precious metals, and more specifically relates to a new method for simultaneously selectively adsorbing and recovering rhenium and mercury from multi-component mixed waste acids of copper smelting by using anion exchange resin. Background technique [0002] Rhenium is one of seven rare metals with an abundance in the Earth's crust of only 10 -8 %, is a veritable scattered metal. Rhenium has a high melting point second only to tungsten at 3170°C, its boiling point is as high as 5900°C, and its density is second only to heavy platinum group metals at 21.02g / cm 3 , rhenium's high melting point, high corrosion resistance and strong plasticity make it possible to form alloy materials with a variety of transition metals with excellent performance and "rhenium effect". , special crucibles, super-temperature materials, etc. have special and critical uses. At the same time, du...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B61/00C22B43/00
CPCC22B7/006C22B43/00C22B61/00Y02P10/20
Inventor 张福元徐娟
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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