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A method for extracting copper from an aqueous solution

An aqueous solution and extraction technology, applied in the field of copper extraction, can solve problems such as viscosity increase, disturbance of aqueous solution and extraction solution dispersion, aqueous solution damage, etc.

Inactive Publication Date: 2004-03-17
OUTOTEC OYJ
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Neutral salts can easily increase the viscosity of the aqueous solution to damage, even to 3cP, which also disturbs the dispersion of the aqueous solution and the extract, and leads to a large number of raffinate droplets
Especially when the desired dispersion is such that the organic solution is the continuous phase and the water is in the form of droplets (dispersed phase), the increase in the viscosity of the aqueous solution can make it difficult to achieve this dispersion
Viscosity increase and disadvantages caused by neutral salts have not been considered before
Clearly, the mix itself also affects mix persistence

Method used

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  • A method for extracting copper from an aqueous solution
  • A method for extracting copper from an aqueous solution
  • A method for extracting copper from an aqueous solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A series of experiments have been carried out which show that when the viscosity of the organic phase is increased by increasing the extractant content during copper extraction according to the invention, the separation of the organic phase and the aqueous solution from each other is facilitated. Table 1 shows the composition of the extract and the results obtained.

[0035] An aqueous solution is prepared using ion-exchanged water, copper sulfate and sulfuric acid. The solution had a copper content of 2 g / l, a sulfuric acid content of 52 g / l and a pH of 1.8. The extract was prepared by mixing different ratios of extractants (commercially available) shown in the above table and kerosene solution D70 (commercially available) as a diluent. The mixing and contacting of the extract and the copper sulfate solution (aqueous solution) was carried out at room temperature with an O / A phase ratio of 1.0, thereby obtaining the copper content values ​​of the solutions in the table...

Embodiment 2

[0041] The aqueous solution was prepared to have a copper content of 1.5 g / l, a sulfuric acid content of 50 g / l, and a pH of 1.8. The following three extracts were also prepared.

[0042] 1.Acorga M 5640 5.0% by volume

[0043] D70 95% by volume

[0044] 2.Acorga M 5640 15.0% by volume

[0045] D70 85% by volume

[0046] 3. Acorga M 5640 25.0% by volume

[0047] D70 75% by volume

[0048] The above-mentioned first solution represents the extraction solution in the prior art.

[0049] The extraction equilibrium curve EEQ and stripping equilibrium curve SEQ as shown in Figures 2, 3 and 4 are determined for the above-mentioned extract and aqueous solution using methods used by experts in the field. Figure 2 illustrates the prior art, Figures 3 and 4 illustrate the method according to the invention. Next, extraction calculations were performed for a copper extraction process with two extraction stages operating under the countercurrent principle and two stripping stag...

Embodiment 3

[0059] In this example, the performance values ​​according to the prior art are shown in FIG. 5 and the performance values ​​according to the method according to the invention are shown in FIGS. 6 and 7 , based on the provided stage calculations. These again show that the inventive method facilitates a considerable reduction in the size of the device. The copper content in the aqueous solution is 3 g / l, ie still a dilute solution. The normal solution is given first in the table at 8.5% by volume of extractant, followed by 15 and 25% by volume according to the invention (as in the examples above). Used extractant and diluent are identical with embodiment 2. The temperature of the extract is 18 degrees Celsius.

[0060] quantity

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Abstract

The invention relates to a method for extracting copper in liquid-liquid solvent extraction from aqueous solutions with a high sulphate content, by raising the viscosity of the extraction solution and by dispersing the aqueous solution into drops, achieving a dense drop aggregation. The viscosity of the extraction solution may be raised either by increasing the content of the actual extractant, the extraction reagent, in the extraction solution or by using a diluting agent with a higher viscosity than that of the diluting agent normally used. By raising the viscosity of the extraction solution the mixing durability of the extraction dispersion can be increased and resulting of that the amount of residual drops is decreased. Other advantages are that the extraction solution flow of the extraction process decreases in relation to the flow of the aqueous solution acting as the copper source and that the size of the extraction equipment needed is reduced.

Description

technical field [0001] The present invention relates to a method for extracting copper from an aqueous solution containing a high content of sulfate by liquid-liquid solvent extraction by increasing the viscosity of the extraction solution and by dispersing the aqueous solution into droplets and forming dense droplet aggregates. The viscosity of the extract can be increased by increasing the actual extractant-extraction reagent volume in the extract or by using a high viscosity diluent with a viscosity greater than normally used diluents. By increasing the viscosity of the extractant, the mixing persistence of the dispersed phase of the extract can be enhanced and result in fewer raffinate droplets. Other advantages reside in the attenuation of the flow rate of the extraction liquid during the extraction process relative to the flow rate of the aqueous solution from which the copper is sourced, and a reduction in the size of the extraction equipment required. Background tech...

Claims

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Application Information

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IPC IPC(8): B01D11/04C22B3/26C22B15/00
CPCB01D11/0457C22B15/0084C22B3/0005Y02P10/20C22B3/26
Inventor 布鲁尔·尼曼斯蒂格-埃里克·胡尔托尔姆劳诺·里尔加埃萨·林戴尔埃罗·埃克曼朱哈尼·里拉雷默·库西斯托佩蒂·佩卡拉
Owner OUTOTEC OYJ
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