KR20060001801A - Solvent extraction method of metal - Google Patents

Abstract

It provides a method to increase the extraction amount over the year and maintain the extraction amount. In winter and cold climates it becomes even more important.

A method of extracting a metal, characterized in that the temperature of the DBC solvent is kept at 25 ° C. or higher, and the separation ability of the solution and the solvent is improved to increase the extraction capacity.

Description

Solvent Extraction Method of Metals {SOLVENT EXTRACTION METHOD OF METAL}

BRIEF DESCRIPTION OF THE DRAWINGS It is an aspect of schematic diagram of the solvent heating apparatus to which this invention is applied.

Fig. 2 shows one aspect of the gold extraction amount when the DBC is warmed up and not warmed up.

The present invention relates to a solvent extraction method of gold.

In particular, the present invention relates to countermeasures in the case where the solvent becomes low temperature in the winter or low temperature region, and the extraction of metal becomes difficult.

Gold extraction is a fast reaction, so the mixer settler is used for continuous operation. In the mixer settler, the aqueous phase and the solvent phase are separated into phases, and dibutylcarbitol (hereinafter referred to as DBC) after gold extraction is recovered. The DBC after gold extraction is subjected to reduction and separation of gold in a gold reduction step, and then sent to a DBC storage tank before gold extraction and sent to a mixer setter with a metering pump for use in gold extraction operations.

The DBC corresponds to the fourth petroleum and the third petroleum and has been used at room temperature.

Therefore, the temperature of the DBC supplied to the gold extraction fluctuated under the influence of the liquid temperature and the temperature before the gold extraction.

Unexpectedly, in the above-mentioned problem, even in Unexamined-Japanese-Patent No. 2001-316735 (patent document 1: Paragraph 0025, 0046, FIG. 1, etc.), the temperature at the time of gold extraction by DBC was not conscious at all.

This is thought to be because the DBC has a high extraction rate and was not very aware of the effects of temperature by those skilled in the art.

Japanese Unexamined Patent Application Publication No. 02-310326 (Patent Document 2: Example 2, etc.) also has a technique relating to extraction of gold using DBC, but there is no description regarding temperature.

[Patent Document 1] Japanese Unexamined Patent Publication No. 2001-316735

[Patent Document 2] Japanese Patent Application Laid-Open No. 02-310326

 Therefore, in winter, when the temperature decreases, it is recognized that the extraction capacity is lowered compared to the summer season, and this measure has led to a demand for a method of maintaining a constant extraction capacity over the year.

In addition, this problem becomes more important problem in cold districts.

The present inventors made the following invention in order to solve the said problem.

That is, the present invention,

(1) A method for extracting metal solvents, wherein the temperature of the DBC solvent is continuously maintained at 25 ° C. or higher to improve the separation ability of the solution and the solvent, thereby increasing the extraction capacity.

(2) The method for extracting a solvent according to (1), wherein the solvent is heated directly or indirectly.

(3) The temperature of the treatment solution to be brought into contact with the DBC solvent is maintained at 26 ° C. or higher with a heat medium, and the temperature of the DBC solvent is maintained at 25 ° C. or higher by contact with the heated solution. Solvent extraction method of the metal, characterized in that to improve the extraction capacity by

(4) The temperature of the treatment solution to be brought into contact with the DBC solvent is maintained at 26 ° C. or higher by a heat exchanger, and the temperature of the DBC solvent is maintained at 25 ° C. or higher by contact with the heated solution. Solvent extraction method of the metal, characterized in that to improve the extraction capacity.

(5) The solvent extraction method of metal as described in said (4) characterized by detecting the solvent temperature after metal extraction, and controlling the heating temperature of the liquid before metal extraction.

(6) The solution used for scrubbing of the solvent after metal extraction is also heated to enable scrubbing with the temperature of the DBC solvent maintained at 25 ° C. or higher, wherein the metal according to the above (4) and (5) Solvent Extraction Method.

(7) A metal solvent extraction method, wherein the heat exchanger according to (4) to (6) uses steam and / or hot water as a heat medium.

(8) The heat exchanger according to the above (4) to (7) is a cell-and-tube system, the inner wall is made of Teflon lining, and the solvent extraction of the metal is carried out by flowing the target treatment liquid in addition to the Teflon tube or the Teflon tube. Way.

(9) A metal solvent extraction method, wherein the metal according to (4) to (8) is gold.

Best Mode for Carrying Out the Invention

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail.

The liquid of interest according to the present invention is an acid bath in which gold is dissolved. For example, hydrochloric acid. The concentration of gold is, for example, a liquid of 1 to 50 g / L.

Gold in the liquid is extracted by DBC as a solvent. At this time, the inventors found out that the extraction amount of gold (at the same time, the specific gravity is also different) varies depending on the temperature of the solvent. For this reason, it is preferable to raise especially the solvent temperature, when outside air, such as winter, is low.

In addition, it can be maintained at 25 ℃ or more, it is possible to maintain a constant amount of extraction, it is possible to maintain a constant processing capacity is an important factor in the corporate activities.

However, in order to raise the temperature of a solvent directly, since it raises many restrictions and required equipment cost depending on a region, it is preferable to raise the temperature of the process liquid previously with a heat medium.

A heat medium is a method by a heat exchanger etc., for example.

As shown in FIG. 1, the target process liquid before gold extraction, for example, passes through a heat exchanger.

The heat exchanger is made of, for example, steam and / or hot water as the heat medium, and the inner wall of the heat exchanger is made of Teflon. In addition, a method of raising the temperature by passing the target treatment liquid through the tube using a Teflon tube or vice versa is also conceivable.

The target processing liquid exiting the steam heat exchanger is heated to about 26 to 60 ° C.

By contacting the heated solution with the DBC solvent, the temperature of the solvent after extraction is necessarily maintained at 25 ° C. or higher even in winter or cold.

Thereby, for example, the amount of gold extracted from the place where sedimentation is ensured is 38 g / L at 10 degreeC, and can raise the capability by 1.2 times or more to 47 g / L at 26 degreeC.

In addition, the temperature of the solvent fluctuates by sensing the temperature of the solvent after extraction and by sensing the temperature of the heat exchanger outlet of the target treatment liquid, so that the amount of steam of the heat exchanger, the hot water, or the amount of steam and the hot water of the heat exchanger can be automatically adjusted. Temperature control without water.

That is, in FIG. 1, the temperature of the solvent is detected at T2, and the temperature of the steam or hot water or the amount or temperature of the hot water is automatically adjusted by sensing the temperature to be treated at T1.

Example

Hereinafter, a specific example is demonstrated about FIG.

By the apparatus shown in FIG. 1, the temperature of the gold extraction liquid was heated to 26-39 degreeC by the heat exchanger.

As a result, as shown in Table 1, the temperature of DBC after extracting gold in the target process liquid in the mixer setler heated up to 26-30 degreeC.

Thereby, as shown in Table 1, the extraction amount by DBC of gold was separable even with 47-51 g / L, and operation became possible.

In addition, it is understood from FIG. 2 that the DBC temperature becomes a preferable gold extraction amount at 25 ° C or higher.

The temperature of DBC after extraction was measured at T1, and the amount of steam sensed the temperature T2 of the heat exchanger outlet of the target treatment liquid. The temperature of the DBC was constant by adjusting the amount of steam in the heat exchanger and adjusting it to a constant T2 temperature.

Compared with the case where heating was not carried out, more than 20% evaporation was possible.

DBC DBC Temperature ℃ Gold concentration g / L  Before Gaon 10 38 14 41 18 43  Warming 26 47 28 49 30 51

(Comparative Example)

When the heating was not carried out, the temperature of the DBC was 10 to 18 ° C., and the phase separation could not be continued unless the extraction amount of gold in the DBC was 38 to 43 g / L or less.

In addition, since the extraction amount of gold is low and the temperature (= specific gravity) of the DBC changes during the day, it is necessary to carefully adjust and manage the treatment liquid flow rate and the DBC flow rate in order to obtain the maximum extraction amount after securing powder separation. The work was troublesome.

According to the invention,

(1) It is possible to increase the extraction capacity throughout the year, but the effect of the extraction capacity is great, especially in winter or cold districts where the temperature is low.

(2) Indirect heating by the target treatment liquid of the solvent can ensure higher safety as compared with the direct heating method.

(3) As a treatment of one aspect in the previous step of the gold extraction method, there is a method in which the temperature of the solution is lowered to remove lead, tellurium and antimony in the solution, and the impurities are separated out and removed. In this case, in winter, the temperature of the solution becomes 5 ° C or lower, which significantly reduces the gold extraction capacity. However, by adopting the present invention, it is possible to prevent the fall of the gold extraction capacity in advance.

Claims (9)

 Dibutylcarbitol (hereinafter referred to as DBC) The temperature of the solvent is continuously maintained at 25 ° C or higher, and the solvent extraction of the metal is improved by improving the separation ability of the solution and the solvent and improving the extraction capacity. Way. The method of extracting a solvent according to claim 1, wherein the solvent is heated directly or indirectly. The temperature of the treatment solution to be brought into contact with the DBC solvent is maintained at 26 ° C. or higher by the heat medium, and the temperature of the DBC solvent is maintained at 25 ° C. or higher by contact with the heated solution. Solvent extraction method of a metal, characterized in that to increase the extraction capacity. The temperature of the treatment solution to be brought into contact with the DBC solvent is maintained at 26 ° C. or higher by a heat exchanger, and the temperature of the DBC solvent is maintained at 25 ° C. or higher by contact with the heated solution. Solvent extraction method of a metal, characterized in that to increase the extraction capacity. 5. The method for extracting solvent of metal according to claim 4, wherein the heating temperature of the liquid before metal extraction is controlled by detecting the solvent temperature after metal extraction. The method of extracting a metal according to claim 4, wherein the solution used for scrubbing the solvent after metal extraction is also heated to enable scrubbing with the temperature of the DBC solvent maintained at 25 ° C or higher. 7. The method of extracting a metal according to any one of claims 4 to 6, wherein the heat exchanger uses steam and / or hot water as a heat medium. The metal solvent according to any one of claims 4 to 6, wherein the heat exchanger is a cell-and-tube type system, and the inside wall is made of Teflon lining to heat the target treatment liquid in the Teflon tube or in addition to the Teflon tube. Extraction method. The method of extracting a solvent according to any one of claims 1 to 6, wherein the metal is gold.

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