JP2006016657A - Method for solvent-extracting metal - Google Patents

Method for solvent-extracting metal Download PDF

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JP2006016657A
JP2006016657A JP2004194904A JP2004194904A JP2006016657A JP 2006016657 A JP2006016657 A JP 2006016657A JP 2004194904 A JP2004194904 A JP 2004194904A JP 2004194904 A JP2004194904 A JP 2004194904A JP 2006016657 A JP2006016657 A JP 2006016657A
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solvent
temperature
extraction
metal
dbc
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Kazuhiro Hatano
和浩 波多野
Takayoshi Fujii
孝悦 藤井
Katsumi Saito
勝美 齋藤
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Nippon Mining Holdings Inc
Eneos Corp
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Nippon Mining and Metals Co Ltd
Nippon Mining Co Ltd
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Priority to JP2004194904A priority Critical patent/JP2006016657A/en
Priority to KR1020040089106A priority patent/KR20060001801A/en
Priority to CNB2004101036628A priority patent/CN100354438C/en
Publication of JP2006016657A publication Critical patent/JP2006016657A/en
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
    • C22B3/20—Treatment or purification of solutions, e.g. obtained by leaching
    • C22B3/26—Treatment or purification of solutions, e.g. obtained by leaching by liquid-liquid extraction using organic compounds
    • C22B3/302—Ethers or epoxides
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B11/00—Obtaining noble metals
    • C22B11/04—Obtaining noble metals by wet processes
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
    • C22B7/006—Wet processes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

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  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Extraction Or Liquid Replacement (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for solvent-extracting gold, which increases an extracted amount throughout a year, and keeps the extracted amount. <P>SOLUTION: The method for solvent-extracting a metal comprises keeping a temperature of a DBC solvent at 25°C or higher, and improving a phase splitting property of a solution and the solvent to enhance the extraction capability. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、金の溶媒抽出方法に関する。
特に冬季或いは低温度の地域に於いて、溶媒が低温と成り金属の抽出が困難に成る場合に於ける対策に関するものである。 The present invention relates to a gold solvent extraction method.
In particular, the present invention relates to countermeasures in the case where the temperature of the solvent becomes low and extraction of the metal becomes difficult in winter or in a low temperature region.

金抽出は、反応が早いためミキサーセットラーを用いて連続操作を行っている。ミキサーセットラーでは、水溶液相と溶媒相を分相させ、金抽出後のジブチルカルビトール（以下DBCと称す。）を回収している。 金抽出後のDBCは、金還元工程で金を還元分離した後、金抽出前DBC貯槽に送られ、定量ポンプにてミキサーセットラーに送り、金抽出操作に用いている。 Since gold extraction is fast, continuous operation is performed using a mixer setler. In the mixer setler, the aqueous phase and the solvent phase are separated, and dibutyl carbitol (hereinafter referred to as DBC) after gold extraction is recovered. The DBC after gold extraction is reduced and separated in the gold reduction process, then sent to the DBC storage tank before gold extraction, sent to the mixer setler with a metering pump, and used for gold extraction operation.

DBCは第４類第３石油類に該当し、これまでは常温で用いていた。
そのため金抽出に供与されるDBCの温度は、金抽出前液温度および気温の影響を受け変動していた。 DBC falls under Class 4 and Class 3 petroleum, and so far it was used at room temperature.
For this reason, the temperature of DBC provided for gold extraction fluctuated due to the effects of the temperature before the gold extraction and the temperature.

上記の問題は、意外にも特開２００１−３１６７３５号（特許文献１：段落００２５、００４６、図１等）においてもDBCによる金抽出時の温度は、全く意識されていない。
これは、DBCが、抽出率が高く、温度による影響を当業者は余り意識しなかったためと思われる。 Surprisingly, the temperature at the time of gold extraction by DBC is not conscious of the above problem even in Japanese Patent Application Laid-Open No. 2001-316735 (Patent Document 1: Paragraphs 0025 and 0046, FIG. 1 and the like).
This seems to be because DBC has a high extraction rate and the person skilled in the art was not much aware of the influence of temperature.

また特開平０２−３１０３２６号（特許文献２：実施例２等）にもDBCを用いた金の抽出に関しての記述があるが、温度に関する記載は全く無い。 Japanese Patent Laid-Open No. 02-310326 (Patent Document 2: Example 2 etc.) also describes gold extraction using DBC, but there is no description about temperature.

特開２００１−３１６７３５号JP 2001-316735 A 特開平０２−３１０３２６号JP 02-310326

よって気温が下がる冬期は、夏期と比べ抽出能力が低下する問題を認識し、この対策により一年を通じて一定の抽出能力を維持できる手法が要望されるに至った。
又この問題は、寒冷地においては、更に重要な問題となる。 Therefore, in winter when the temperature drops, the problem that the extraction capacity is lower than in the summer is recognized, and this measure has led to a demand for a method that can maintain a constant extraction capacity throughout the year.
This problem becomes a more important problem in cold regions.

本発明者らは、上記の問題を解決すべく、以下の発明を成した。
即ち本発明は、
（１） DBC溶媒の温度を、継続して２５℃以上に保持し、溶液と溶媒の分相性を良好にし、抽出能力を高めることを特徴とする金属の溶媒抽出方法。
（２）上記（１）の溶媒の加温方法に於いて、溶媒を直接或いは、間接的に昇温することを特徴とする金属の溶媒抽出方法。
（３）DBC溶媒と接触させる対象処理溶液の温度を、熱媒体により２６℃以上に保持し、前記昇温した溶液と接触させ、DBC溶媒の温度を２５℃以上に保持し、溶液と溶媒の分相性を良好にし、抽出能力を高めることを特徴とする金属の溶媒抽出方法
（４） DBC溶媒と接触させる対象処理溶液の温度を、熱交換器により２６℃以上に保持し、前記昇温した溶液と接触させ、DBC溶媒の温度を２５℃以上に保持し、溶液と溶媒の分相性を良好にし、抽出能力を高めることを特徴とする金属の溶媒抽出方法。 In order to solve the above problems, the present inventors made the following invention.
That is, the present invention
(1) A method for extracting a solvent of a metal, wherein the temperature of the DBC solvent is continuously maintained at 25 ° C. or more, the phase separation between the solution and the solvent is improved, and the extraction ability is increased.
(2) The method for extracting a solvent of a metal according to (1), wherein the temperature of the solvent is increased directly or indirectly.
(3) The temperature of the target treatment solution to be brought into contact with the DBC solvent is maintained at 26 ° C. or higher with a heating medium, brought into contact with the heated solution, and the temperature of the DBC solvent is maintained at 25 ° C. or higher. Metal solvent extraction method characterized in that phase separation is improved and extraction ability is enhanced (4) The temperature of the target treatment solution to be contacted with the DBC solvent is maintained at 26 ° C. or higher by a heat exchanger, and the temperature is increased. A metal solvent extraction method characterized by contacting with a solution, maintaining the temperature of the DBC solvent at 25 ° C. or more, improving the phase separation between the solution and the solvent, and increasing the extraction capability.

（５）金属抽出後の溶媒温度を検知し、金属抽出前液の加熱温度を制御することを特徴とする上記（４）記載の金属の溶媒抽出方法。
（６）金属抽出後の溶媒のスクラビングに供する溶液も加温し、DBC溶媒の温度を２５℃以上に保持したスクラビングを可能とすることを特徴とする上記（４）及び又は（５）記載の金属の溶媒抽出方法。
（７）上記（４）〜（６）記載の熱交換器が、蒸気及び又は温水を熱媒体としたことを特徴とする金属の溶媒抽出方法。 (5) The method for extracting a metal solvent according to (4), wherein the solvent temperature after metal extraction is detected and the heating temperature of the pre-metal extraction solution is controlled.
(6) The solution to be used for scrubbing the solvent after metal extraction is also heated to enable scrubbing while maintaining the temperature of the DBC solvent at 25 ° C. or higher. (4) and / or (5) Metal solvent extraction method.
(7) A method for extracting a metal solvent, wherein the heat exchanger according to (4) to (6) above uses steam and / or hot water as a heat medium.

（８）上記（４）〜（７）記載の熱交換器がシェル アンド チューブ方式であり、内壁をテフロンライニングとし、テフロンチューブ内或いはテフロンチューブ外に対象処理液を流し、加温することを特徴とする金属の溶媒抽出方法。
（９）上記（４）〜（８）記載の金属が、金であることを特徴とする金属の溶媒抽出方法。 (8) The heat exchanger described in the above (4) to (7) is a shell-and-tube system, the inner wall is made of Teflon lining, and the target treatment liquid is flowed inside or outside the Teflon tube and heated. A method for extracting a metal solvent.
(9) The solvent extraction method for metals, wherein the metal described in (4) to (8) is gold.

本発明によれば、
（１）年間を通じて、抽出能力のアップを図れるが、特に気温の低い冬季或いは寒冷地において、抽出能力アップの効果が大きい。
（２）溶媒の対象処理液による間接加熱は、直接加熱法と比較して、より高い安全性を確保できる。 According to the present invention,
(1) Although the extraction capacity can be improved throughout the year, the effect of increasing the extraction capacity is great especially in winter or cold regions where the temperature is low.
(2) Indirect heating with the target treatment liquid of the solvent can ensure higher safety compared to the direct heating method.

（３）金抽出法の前工程における一態様の処理として、溶液中の鉛、テルル、アンチモンを除去するため、溶液の温度を下げ、前記不純物を析出分離・除去している方法があるが、この場合、冬季は、溶液の温度が５℃以下と成り、金抽出能力が著しく低下する。しかし、本発明を採用することで、金抽出能力の低下を未然に防止できる。  (3) As a process of one aspect in the previous step of the gold extraction method, in order to remove lead, tellurium and antimony in the solution, there is a method in which the temperature of the solution is lowered and the impurities are separated and removed. In this case, in the winter season, the temperature of the solution is 5 ° C. or lower, and the gold extraction ability is significantly reduced. However, by adopting the present invention, it is possible to prevent a decrease in gold extraction capability.

以下本発明に関して、詳細に説明する。
本発明に関する対象の液は、金が溶解する酸性浴である。例えば、塩酸酸性である。金の濃度は、例えば １〜５０ｇ／Ｌの液である。 Hereinafter, the present invention will be described in detail.
The liquid of interest with respect to the present invention is an acidic bath in which gold dissolves. For example, hydrochloric acid acidity. The gold concentration is, for example, a liquid of 1 to 50 g / L.

該液中の金を溶媒であるDBCにより、抽出する。この際に、溶媒の温度により、金の抽出量が（同時に比重も異なる）異なることを本発明者等は、知見している。このため溶媒の温度を冬季等の外気の低い場合は、特にあげることが望ましい。
また、継続して２５℃以上に保持できることにより、一定の抽出量が維持できることとなり、一定の処理能力を維持できることとなり、企業活動上重要な要素となる。
ただ直接溶媒の温度を上げるには、地域によっては、多くの制約や必要となる設備費の増大を招くことから、予め対象の処理液を熱媒体により、温度を上昇させて置くことが望ましい。 Gold in the liquid is extracted with DBC as a solvent. At this time, the present inventors have found that the amount of gold extraction (at the same time the specific gravity differs) depends on the temperature of the solvent. For this reason, it is desirable to raise the temperature of the solvent particularly when the outside air is low, such as in winter.
Moreover, since it can maintain at 25 degreeC or more continuously, a fixed extraction amount can be maintained, a fixed processing capability can be maintained, and it becomes an important factor in corporate activity.
However, in order to directly raise the temperature of the solvent, there are many restrictions and an increase in necessary equipment costs depending on the region. Therefore, it is desirable to place the target treatment liquid at an elevated temperature in advance with a heat medium.

熱媒体とは、例えば熱交換器等による方法がある。
図１に示すように、例えば金の抽出前の対象処理液は、熱交換器に通される。
熱交換器は、例えば蒸気及び又は温水を熱媒体とし、熱交換器の内壁は、テフロン性とする。 更にテフロンチューブを用いて、チューブ内に対象処理液を通過し、昇温させる方法、或いはその反対の態様も考えられる。 Examples of the heat medium include a method using a heat exchanger.
As shown in FIG. 1, for example, the target treatment liquid before gold extraction is passed through a heat exchanger.
The heat exchanger uses, for example, steam and / or hot water as a heat medium, and the inner wall of the heat exchanger is made of Teflon. Further, a method of using a Teflon tube to pass the target treatment liquid into the tube and raising the temperature, or the opposite mode is also conceivable.

蒸気熱交換器を出た対象処理液は、２６〜６０℃程度に昇温される。
該昇温した処理液とDBC溶媒とが接触することにより、必然的に抽出後の溶媒の温度は、冬季或いは、冷寒地であっても２５℃以上の保持されることになる。
これにより、例えば分相性を確保したところでの金の抽出量は、１０℃では３８g/Lであったものが、２６℃では４７g/Lと、１.２倍以上の能力アップを図ることができる。 The target processing liquid exiting the steam heat exchanger is heated to about 26 to 60 ° C.
When the heated treatment liquid and the DBC solvent come into contact with each other, the temperature of the solvent after extraction is inevitably maintained at 25 ° C. or higher even in winter or in cold and cold regions.
As a result, for example, the gold extraction amount at the time when phase separation is ensured was 38 g / L at 10 ° C., but it was 47 g / L at 26 ° C., which can increase the capacity by 1.2 times or more. .

又溶媒の温度は、抽出後の溶媒の温度を感知し、対象処理液の熱交換器出口の温度を感知することにより、熱交換器の蒸気量及び又は温水を自動的に調整できるようにすることにより、変動の無い温度管理ができる。
即ち図１においては、Ｔ２において、溶媒の温度を検知し、Ｔ１の処理対象温度を感知し、蒸気量及び又は温水の温度或いは液量を自動調節する。 In addition, the temperature of the solvent senses the temperature of the solvent after extraction, and senses the temperature of the heat exchanger outlet of the target treatment liquid, so that the steam amount and / or hot water of the heat exchanger can be automatically adjusted. Therefore, temperature control without fluctuation can be performed.
That is, in FIG. 1, at T2, the temperature of the solvent is detected, the temperature to be treated at T1 is sensed, and the vapor amount and / or the temperature or amount of hot water are automatically adjusted.

以下図１に則して、具体例を説明する。
図１に示す装置により金抽出前液の温度を熱交換器により加温し、２６〜３９℃とした。
この結果、表１に示すように対象処理液中の金をミキサーセットラーにおいて、抽出した後のDBCの温度は、２６〜３０℃と昇温した。
これにより、金のDBCによる抽出量を表１に示すように４７〜５１g/Lとしても分相性を確保でき、操業が可能と成った。
また図２からＤＢＣの温度が、２５℃以上において、好ましい金の抽出量となることが把握される。
抽出後のDBCの温度は、Ｔ１において測定し、蒸気量は、対象処理液の熱交換器出口の温度Ｔ２を感知し、熱交換器の蒸気量を調整し、一定したＴ２温度と成るように調整し、DBCの温度を一定とした。
加温を行わなかった場合と比べ、２割以上の増産が可能となった。

Figure 2006016657
A specific example will be described below with reference to FIG.
The temperature of the gold pre-extraction solution was heated by a heat exchanger using the apparatus shown in FIG.
As a result, as shown in Table 1, the temperature of the DBC after extracting the gold in the target treatment liquid with a mixer setler was raised to 26 to 30 ° C.
As a result, even when the amount of gold extracted by DBC is 47 to 51 g / L as shown in Table 1, phase separation can be ensured and operation is possible.
Further, it can be seen from FIG. 2 that when the temperature of the DBC is 25 ° C. or higher, a preferable gold extraction amount is obtained.
The temperature of DBC after extraction is measured at T1, and the amount of steam is detected by detecting the temperature T2 at the outlet of the heat exchanger of the target treatment liquid, and the amount of steam in the heat exchanger is adjusted so that the T2 temperature becomes constant. Adjustment was made to keep the temperature of the DBC constant.
Compared to the case without heating, it was possible to increase production by more than 20%.
Figure 2006016657

（比較例）
加温を行わなかった場合、DBCの温度は、１０〜１８℃となり、DBC中の金の抽出量を、３８〜４３g/L以下にしなければ分相性を確保し、操業を継続することが出来なかった。
また、金の抽出量が低く、１日の間でDBCの温度（＝比重）が変化するため、分相性を確保した上で抽出量の最大を得るためには、対象処理液流量とDBC流量のきめ細かい調整・管理が必要となり、抽出作業も煩雑であった。 (Comparative example)
If heating is not performed, the temperature of DBC will be 10-18 ° C. If the amount of gold extracted in DBC is 38-43 g / L or less, phase separation is ensured and operation can be continued. There wasn't.
In addition, since the amount of gold extraction is low and the temperature (= specific gravity) of DBC changes during one day, the target treatment liquid flow rate and DBC flow rate are necessary to obtain the maximum extraction amount while ensuring phase separation. Detailed adjustment and management were required, and the extraction work was complicated.

本発明が適用される溶媒加温装置の略図の一態様である。It is one aspect | mode of the schematic of the solvent heating apparatus with which this invention is applied. ＤＢＣを加温した場合と加温しない場合の金抽出量の一態様を示す。The one aspect | mode of the gold extraction amount when not heating when DBC is heated is shown.

Claims (9)

ジブチルカルビトール（以下DBCと称す。）溶媒の温度を継続して、２５℃以上に保持し、溶液と溶媒の分相性を良好にし、抽出能力を高めることを特徴とする金属の溶媒抽出方法。 A metal solvent extraction method characterized by maintaining the temperature of dibutyl carbitol (hereinafter referred to as DBC) solvent at 25 ° C. or higher, improving the phase separation between the solution and the solvent, and increasing the extraction capability. 請求項１の溶媒の加温方法に於いて、溶媒を直接或いは、間接的に昇温することを特徴とする金属の溶媒抽出方法。 2. The method for extracting a solvent of a metal according to claim 1, wherein the temperature of the solvent is increased directly or indirectly. DBC溶媒と接触させる対象処理溶液の温度を、熱媒体により２６℃以上に保持し、前記昇温した溶液と接触させ、DBC溶媒の温度を２５℃以上に保持し、溶液と溶媒の分相性を良好にし、抽出能力を高めることを特徴とする金属の溶媒抽出方法。 The temperature of the target treatment solution to be brought into contact with the DBC solvent is maintained at 26 ° C. or higher with a heating medium, brought into contact with the heated solution, the temperature of the DBC solvent is maintained at 25 ° C. or higher, and the phase separation between the solution and the solvent is increased. A method for extracting a solvent of a metal, characterized by improving the extraction capability. DBC溶媒と接触させる対象処理溶液の温度を、熱交換機により２６℃以上に保持し、前記昇温した溶液と接触させ、DBC溶媒の温度を２５℃以上に保持し、溶液と溶媒の分相性を良好にし、抽出能力を高めることを特徴とする金属の溶媒抽出方法。 The temperature of the target treatment solution to be brought into contact with the DBC solvent is kept at 26 ° C. or higher by a heat exchanger, brought into contact with the heated solution, the temperature of the DBC solvent is kept at 25 ° C. or more, and the phase separation between the solution and the solvent is increased. A method for extracting a solvent of a metal, characterized by improving the extraction capability. 金属抽出後の溶媒温度を検知し、金属抽出前液の加熱温度を制御することを特徴とする請求項４記載の金属の溶媒抽出方法。 5. The method for extracting a solvent of a metal according to claim 4, wherein the temperature of the solvent after the metal extraction is detected and the heating temperature of the solution before the metal extraction is controlled. 金属抽出後の溶媒のスクラビングに供する溶液も加温し、DBC溶媒の温度を２５℃以上に保持したスクラビングを可能とすることを特徴とする請求項４及び又は５記載の金属の溶媒抽出方法。 6. The method for extracting a metal from a solvent according to claim 4 or 5, wherein the solution used for scrubbing the solvent after metal extraction is also heated to enable scrubbing while maintaining the temperature of the DBC solvent at 25 ° C. or higher. 請求項４〜６記載の熱交換器が、蒸気及び又は温水を熱媒体としたことを特徴とする金属の溶媒抽出方法。 7. The metal solvent extraction method according to claim 4, wherein the heat exchanger uses steam and / or hot water as a heat medium. 請求項４〜７記載の熱交換器が、シェル アンド チューブ方式であり、内壁をテフロンライニングとし、テフロンチューブ内或いはテフロンチューブ外に対象処理液を流し、加温することを特徴とする金属の溶媒抽出方法。 The heat exchanger according to any one of claims 4 to 7, which is a shell-and-tube method, has an inner wall made of Teflon lining, and the target treatment liquid is poured into or out of the Teflon tube and heated. Extraction method. 請求項１〜８記載の金属が、金であることを特徴とする金属の溶媒抽出方法。

The metal extraction method according to claim 1, wherein the metal is gold.

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