JP4984122B2 - Method for recovering gold or platinum group elements from SiC-based materials - Google Patents
Method for recovering gold or platinum group elements from SiC-based materials Download PDFInfo
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- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical group [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 title claims description 44
- 239000000463 material Substances 0.000 title claims description 41
- 229910052737 gold Inorganic materials 0.000 title claims description 38
- 239000010931 gold Substances 0.000 title claims description 38
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 title claims description 37
- 238000000034 method Methods 0.000 title claims description 25
- 229910052751 metal Inorganic materials 0.000 claims description 33
- 239000002184 metal Substances 0.000 claims description 33
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 32
- 229910052802 copper Inorganic materials 0.000 claims description 32
- 239000010949 copper Substances 0.000 claims description 32
- 238000007254 oxidation reaction Methods 0.000 claims description 19
- 230000003647 oxidation Effects 0.000 claims description 18
- 239000007789 gas Substances 0.000 claims description 17
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 12
- 239000001301 oxygen Substances 0.000 claims description 12
- 229910052760 oxygen Inorganic materials 0.000 claims description 12
- 238000011084 recovery Methods 0.000 claims description 11
- 239000003054 catalyst Substances 0.000 claims description 10
- 239000002699 waste material Substances 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 6
- 238000000746 purification Methods 0.000 claims description 6
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 claims description 5
- 239000005751 Copper oxide Substances 0.000 claims description 5
- 229910000431 copper oxide Inorganic materials 0.000 claims description 5
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 4
- 229910001882 dioxygen Inorganic materials 0.000 claims description 4
- 239000002893 slag Substances 0.000 description 15
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 238000007664 blowing Methods 0.000 description 3
- 239000010419 fine particle Substances 0.000 description 3
- 230000004907 flux Effects 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 229910000510 noble metal Inorganic materials 0.000 description 3
- 229910052763 palladium Inorganic materials 0.000 description 3
- 229910052697 platinum Inorganic materials 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000002156 mixing Methods 0.000 description 2
- 239000010948 rhodium Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical compound [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000012876 carrier material Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052741 iridium Inorganic materials 0.000 description 1
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 229910052762 osmium Inorganic materials 0.000 description 1
- SYQBFIAQOQZEGI-UHFFFAOYSA-N osmium atom Chemical compound [Os] SYQBFIAQOQZEGI-UHFFFAOYSA-N 0.000 description 1
- 238000006864 oxidative decomposition reaction Methods 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 239000010970 precious metal Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229910052703 rhodium Inorganic materials 0.000 description 1
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 1
- 229910052707 ruthenium Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
Classifications
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- 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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- Processing Of Solid Wastes (AREA)
- Catalysts (AREA)
- Manufacture And Refinement Of Metals (AREA)
Description
本発明は、排ガス浄化用触媒の廃棄物等のＳｉＣ系物質からその中に含有される金または白金族元素を回収する方法に関するものである。 The present invention relates to a method for recovering gold or platinum group elements contained therein from SiC-based materials such as wastes of exhaust gas purification catalysts.
最近、ＳｉＣを金または白金族元素の担体（基体）物質として用いた触媒による排ガス浄化システムの実用化が進められている。ＳｉＣは耐熱性に優れるため、特にディーゼルエンジンの排ガスのＰＭ燃焼用触媒の担体物質として用いると触媒の性能・耐久性が向上するものと期待されているが、触媒としての使命を終えた使用後の触媒廃棄物から金または白金族元素を回収する方法については下記のように種々提案されているものの、ＳｉＣは融点が２７００℃以上で且つ化学的に不活性でもあり、適切な回収方法はまだ開発されるに至っていないのが現状である。
さらにＳｉＣは乾式プロセスの溶融スラグ中に溶解させにくいという問題がある。本発明者らの実験によると、ＳｉＣ系物質を単独で電気炉内の溶融スラグに投入したところ、ＳｉＣ系物質は固体のまま溶融スラグ表面上に浮上し、強制的にＳｉＣ系物質を溶融スラグ中に没入させる操作を行わない限り、溶融スラグ中に完全に溶解させることは困難である。また溶解したとしても、未反応のＳｉＣがスラグ中に残存することがあり、これではＳｉＣ系物質の廃棄物触媒を処理し、含有される金または白金族元素を回収することはできない。したがって、今後使用が増えるであろうと予測されるＳｉＣを用いた排ガス浄化用触媒の使用済み材料を処理し含有される金または白金族元素を回収する方法の確立が急務となっている。
本発明は、このような現状に鑑み、ＳｉＣ系物質に含有される金または白金族元素の回収を行う方法を提供しようというものである。
Furthermore, there is a problem that SiC is difficult to dissolve in the molten slag of the dry process. According to the experiments by the present inventors, when the SiC-based material was put alone into the molten slag in the electric furnace, the SiC-based material floated on the surface of the molten slag as it was solid, and the SiC-based material was forcibly removed from the molten slag. Unless the operation of immersing in is performed, it is difficult to completely dissolve in the molten slag. Further, even if dissolved, unreacted SiC may remain in the slag, and this makes it impossible to treat the waste catalyst of the SiC-based material and recover the contained gold or platinum group elements. Accordingly, there is an urgent need to establish a method for treating a used material of an exhaust gas purification catalyst using SiC, which is expected to be used in the future, and recovering contained gold or platinum group elements.
In view of such a current situation, the present invention intends to provide a method for recovering gold or platinum group elements contained in SiC-based materials.
ＳｉＣ系物質を処理し含有される金または白金族元素を回収するためには、ＳｉＣを分解して溶融スラグ成分とし、かつＳｉＣ系物質に含有されていた金または白金族元素を金属銅中に移行させることが必要である。発明者らはこれらの知見を基に種々検討の結果、以下の発明を見出した。 In order to recover the gold or platinum group element contained by treating the SiC-based material, SiC is decomposed into a molten slag component, and the gold or platinum group element contained in the SiC-based material is contained in the metallic copper. It is necessary to migrate. As a result of various studies based on these findings, the inventors have found the following invention.
すなわち本発明は第１に、金または白金族元素を含有するＳｉＣ系物質から該金または白金族元素を回収する方法において、前記ＳｉＣ系物質を金属銅と共に炉内で酸化処理し、Ｓｉ酸化物と銅酸化物を含有する溶融酸化物（スラグ）層と前記金または白金族元素を含有する溶融金属銅（メタル）層とに分離することを特徴とする金または白金族元素の回収方法；第２に、金または白金族元素を含有するＳｉＣ系物質から該金または白金族元素を回収する方法において、前記ＳｉＣ系物質を溶融金属銅と共に炉内で酸化処理し、該炉内の上層溶融層としてＳｉ酸化物と銅酸化物を主体とする溶融酸化物（スラグ）層を、該炉内の下層溶融層として前記金または白金族元素を含有する溶融金属銅（メタル）層を形成させることによって、該溶融金属銅（メタル）層中に該金または白金族元素を回収することを特徴とする金または白金族元素の回収方法；第３に、前記炉内に装入する前記ＳｉＣ系物質／前記金属銅の質量比が０.４５以下である前記第１または２記載の回収方法；第４に、前記酸化処理は酸素ガスまたは酸素含有ガスを前記炉内に導入して行う前記第１〜３のいずれかに記載の回収方法；第５に、前記酸化処理は前記炉内の温度を１１００〜１６００℃に維持して行う前記第１〜４のいずれかに記載の回収方法；第６に、前記炉内に装入する前記ＳｉＣ系物質は５ｍｍ目の篩を通過する粒度である前記第１〜５のいずれかに記載の回収方法；第７に、前記ＳｉＣ系物質は金または白金族元素を担持したＳｉＣを主体とする排ガス浄化用触媒廃棄物である前記第１〜６のいずれかに記載の回収方法を提供する。 That is, according to the present invention, first, in a method for recovering a gold or platinum group element from an SiC based material containing gold or a platinum group element, the SiC based material is oxidized in a furnace together with metallic copper, and a Si oxide is obtained. A method for recovering gold or platinum group elements, comprising: a molten oxide (slag) layer containing copper oxide and a molten metal copper (metal) layer containing gold or platinum group elements; 2. In the method for recovering the gold or platinum group element from the SiC or the platinum group element-containing SiC-based material, the SiC-based material is oxidized together with molten metal copper in a furnace, and the upper molten layer in the furnace By forming a molten oxide (slag) layer mainly composed of Si oxide and copper oxide as a molten metal copper (metal) layer containing the gold or platinum group element as a lower molten layer in the furnace The melting A method for recovering gold or platinum group elements, wherein the gold or platinum group elements are recovered in a genus copper (metal) layer; third, the SiC-based material / metal copper charged in the furnace The recovery method according to the first or second aspect, wherein the mass ratio is 0.45 or less; fourth, the oxidation treatment is performed by introducing oxygen gas or oxygen-containing gas into the furnace. 5. The recovery method according to any one of the first to fourth, wherein the oxidation treatment is performed while maintaining the temperature in the furnace at 1100-1600 ° C .; sixth, the furnace The recovery method according to any one of 1 to 5 above, wherein the SiC-based material charged in the inside has a particle size passing through a 5 mm sieve; seventh, the SiC-based material carries gold or a platinum group element 1 to 6 above, which are exhaust gas purification catalyst waste mainly composed of SiC. It provides a recovery method according to any Re.
本発明によれば、被処理原料の主成分であるＳｉＣの酸化分解に伴う発熱および当初の溶融金属銅の酸化熱によって熱エネルギーコストが節減され、且つ、ＳｉＣのＣ分は燃焼して排ガスとなって系外へ排出され、またＳｉＣのＳｉ分が酸化されて生じるＳｉ酸化物（ＳｉＯ2）はフラックス成分であるために新たなフラックスの添加は必要に応じた最小限で済みスラグの発生量が少なくなり、操業面で有利となる。その上で、ＳｉＣ系物質中に含有される金または白金族元素を溶融金属銅（メタル）層の中に高い回収率で効率的に回収することができる。 According to the present invention, the heat energy cost is reduced by the heat generated by the oxidative decomposition of SiC, which is the main component of the raw material to be treated, and the initial heat of oxidation of the molten metal copper, and the C content of SiC is burned to produce exhaust gas. Since the Si oxide (SiO 2 ) generated when the Si content of SiC is oxidized and discharged from the system is a flux component, the addition of new flux can be minimized as required, and the amount of slag generated This is advantageous in terms of operation. In addition, gold or platinum group elements contained in the SiC-based material can be efficiently recovered at a high recovery rate in the molten metal copper (metal) layer.
本発明における白金族元素は元素の周期表第VIII族に属するルテニウムＲｕ、ロジウムＲｈ、パラジウムＰｄ、オスミウムＯｓ、イリジウムＩｒ、白金Ｐｔの６元素を示す。本明細書中で金とこの白金族元素を総称して貴金属ということがある。 The platinum group element in the present invention represents six elements of ruthenium Ru, rhodium Rh, palladium Pd, osmium Os, iridium Ir, and platinum Pt belonging to Group VIII of the periodic table of elements. In the present specification, gold and this platinum group element are sometimes collectively referred to as noble metals.
本発明において「金または白金族元素を含有するＳｉＣ系物質」とは、金または白金族元素を担持等の種々の形態で含有するＳｉＣを主体とする物質の総称であって、好ましくはＳｉＣを５０質量％を超えて含有するＳｉＣ主体の材料であり、他の添加物質やＰＭ（ディーゼルエンジンからの排ガスの粒子状物質）などが含有されている場合がある。このＳｉＣ系物質としては、例えば、上記のディーゼルエンジンの排ガス浄化用触媒の廃棄物、さらに電子部品廃棄物等が挙げられる。 In the present invention, the “SiC-based substance containing gold or platinum group element” is a general term for substances mainly composed of SiC containing gold or platinum group element in various forms such as supporting, preferably SiC. It is a SiC-based material that contains more than 50% by mass, and may contain other additive substances, PM (particulate matter of exhaust gas from diesel engines), and the like. Examples of the SiC-based material include waste of the exhaust gas purification catalyst of the diesel engine, and electronic component waste.
本発明において用いられる金属銅は純度に制限はなく、勿論、金または白金族元素が含有されていても、さらには、鉄、クロム等の不純物元素が含有されていても不都合なく使用することができる（後述の実施例では実質的に純度１００質量％の金属銅を使用した）。 The copper metal used in the present invention is not limited in purity, and of course, it can be used without any inconvenience even if it contains gold or platinum group elements or even contains impurity elements such as iron and chromium. (In the examples described later, metallic copper having a purity of substantially 100% by mass was used).
本発明における前記の炉として転炉または回転炉を用いると、必要に応じて傾動または回転させることによってＳｉＣ系物質と溶融金属銅の接触・混合を促進させることができ、かつ、酸素ガスまたは酸素含有ガスをランスによって表面上から吹き付けて酸化処理することができ、さらに、酸化処理後に傾動させることによって最初に溶融酸化物層を抜き出し、その後溶融金属銅層を抜き出すことができるので、両層を容易に分離することができる。
また、炉内の溶体中に酸素ガスまたは酸素含有ガスを直接に吹き込むことによって、溶体の撹拌を促し、ＳｉＣの酸化速度を速めることもできる。
なお、酸化処理後の溶融酸化物は溶融金属銅より比重が小さいので、炉内酸化処理後の溶融酸化物と溶融金属銅との混合溶融体（液相）を炉内で静置することにより、溶融酸化物は上層、溶融金属銅は下層となって容易に相互に分離される。
When a converter or a rotary furnace is used as the furnace in the present invention, contact / mixing of SiC-based material and molten metal copper can be promoted by tilting or rotating as required, and oxygen gas or oxygen It is possible to oxidize the contained gas by spraying from the surface with a lance, and furthermore, by tilting after the oxidization treatment, the molten oxide layer can be extracted first, and then the molten metal copper layer can be extracted. It can be easily separated.
Further, by directly blowing oxygen gas or oxygen-containing gas into the solution in the furnace, stirring of the solution can be promoted, and the oxidation rate of SiC can be increased.
In addition, since the molten oxide after the oxidation treatment has a specific gravity smaller than that of the molten metal copper, the mixed melt (liquid phase) of the molten oxide and the molten metal copper after the oxidation treatment in the furnace is left in the furnace. The molten oxide becomes the upper layer and the molten metal copper becomes the lower layer and is easily separated from each other.
また、ＳｉＣ系物質を酸化処理するためには、装入される金属銅の量に応じたＳｉＣ系物質の配合比のコントロールも重要である。炉内に装入されるＳｉＣ系物質／金属銅の質量比は０.４５以下が好ましい。この質量比が０.４５を超える場合は、装入されたＳｉＣ系物質の一部が酸化処理されずに未反応で残留する。
なお、酸化処理の操業は、金または白金族元素を溶融金属銅層に移行させるため、当初の溶融金属銅の一部を酸化されずに残して終了することが必要である。
In addition, in order to oxidize the SiC-based material, it is also important to control the blending ratio of the SiC-based material according to the amount of metal copper to be charged. The mass ratio of SiC-based material / metal copper charged in the furnace is preferably 0.45 or less. When this mass ratio exceeds 0.45, part of the charged SiC-based material remains unreacted without being oxidized.
It should be noted that the operation of the oxidation treatment needs to be terminated while leaving a part of the original molten metal copper unoxidized in order to transfer gold or platinum group elements to the molten metal copper layer.
酸化処理時の炉内温度は１１００〜１６００℃が好ましい。１１００℃未満では酸化速度が低く、且つ溶融相の上層、下層への分離が困難となる。一方、１６００℃を超えると、炉内耐火物の損傷を招くようになるので好ましくない。上記炉内温度は１３００〜１５００℃がさらに好ましい。 The furnace temperature during the oxidation treatment is preferably 1100 to 1600 ° C. If it is less than 1100 ° C., the oxidation rate is low, and it becomes difficult to separate the molten phase into an upper layer and a lower layer. On the other hand, if the temperature exceeds 1600 ° C., the refractory in the furnace is damaged, which is not preferable. The furnace temperature is more preferably 1300-1500 ° C.
酸化処理反応を促進させるためには、炉内に装入されるＳｉＣ系物質は５ｍｍ目の篩を通過する粒度であることが好ましく、５ｍｍ目を超える粒度では酸化速度が低下する。
また、上記ＳｉＣ系物質は破砕されて微粒が発生する場合があり、この場合には酸素含有ガスの炉内への吹き込み（酸化処理）によってその微粒が炉外へ飛散する可能性があるが、上記ＳｉＣ系物質（またはその微粒）を、５ｍｍ目の篩を通過する粒度の範囲内で、造粒することによって飛散を防止することができる。
In order to promote the oxidation treatment reaction, it is preferable that the SiC-based material charged in the furnace has a particle size that passes through a 5 mm sieve, and the oxidation rate decreases at a particle size exceeding the 5 mm particle.
In addition, the SiC-based material may be crushed to generate fine particles. In this case, the fine particles may be scattered outside the furnace by blowing oxygen-containing gas into the furnace (oxidation treatment). Scattering can be prevented by granulating the SiC-based material (or its fine particles) within the range of the particle size passing through the 5 mm sieve.
また、酸素含有ガスは酸素濃度に特に制限はないが、酸化処理速度向上の点から酸素濃度４０％以上の酸素含有ガスが好ましい。 Further, the oxygen concentration of the oxygen-containing gas is not particularly limited, but an oxygen-containing gas having an oxygen concentration of 40% or more is preferable from the viewpoint of improving the oxidation treatment rate.
本発明の溶融酸化物（スラグ）層はＳｉＣ系物質の酸化により生じたＳｉ酸化物と金属銅の一部の酸化により生じた銅酸化物によって形成されるが、必要に応じてＣａ酸化物、Ａｌ酸化物、Ｆｅ酸化物、Ｎａ酸化物などのフラックス（酸化物等）を少量添加して、スラグ流動性を向上させ、または操業スラグ温度を低下させて、より良好なスラグを形成することもできる。 The molten oxide (slag) layer of the present invention is formed by the Si oxide generated by the oxidation of the SiC-based material and the copper oxide generated by the oxidation of a part of the copper metal. A small amount of fluxes (oxides, etc.) such as Al oxide, Fe oxide, Na oxide may be added to improve slag fluidity or lower operating slag temperature to form better slag. it can.
本発明によって得られた前記の金または白金族元素を含有する溶融金属銅層からは種々の溶融法または電解法などの公知の方法によって金または白金族元素をさらに分別回収することができる。 From the molten metal copper layer containing the gold or platinum group element obtained by the present invention, the gold or platinum group element can be further separated and recovered by known methods such as various melting methods or electrolysis methods.
以下に本発明の実施例を記載するが、本発明の技術的範囲はこの記載に限定されるものではないことは言うまでもない。 Examples of the present invention will be described below, but it goes without saying that the technical scope of the present invention is not limited to this description.
［実施例１］ ハニカム形状のＳｉＣの基体にＰｔ、Ｐｄ、Ａｕの３種の貴金属を担持したＳｉＣを９５質量％含有するＳｉＣ系物質を使用した。このＳｉＣ系物質の貴金属含有率を表１に示す。転炉内に溶融した金属銅５０５ｋｇと５ｍｍ目の篩を通過した上記ＳｉＣ系物質２０３ｋｇを装入した。装入後、転炉内においてランスにより酸素含有ガスとして酸素含有率４０％の酸素富化空気を装入物の表面上から吹きつけ、装入物温度を１４００〜１４５０℃に維持し、金属銅が半分程度にまで減少した時点で吹き込み（酸化処理）を終了し、その後静置させて上方が溶融酸化物（スラグ）層、下方が溶融メタル（金属銅）層の２層に分離した。転炉を傾動させて上層の溶融酸化物層を取鍋に排出し、炉内に溶融メタル（金属銅）分を残した。両層の重量、貴金属含有率、処理前後の物量を表２に示す。 [Example 1] A SiC-based material containing 95% by mass of SiC supporting three kinds of noble metals Pt, Pd, and Au on a honeycomb-shaped SiC substrate was used. Table 1 shows the noble metal content of this SiC-based material. In the converter, 505 kg of molten metal copper and 203 kg of the SiC-based material that passed through a 5 mm sieve were charged. After charging, oxygen enriched air having an oxygen content of 40% is blown from the surface of the charge as an oxygen-containing gas by a lance in the converter, and the charge temperature is maintained at 1400 to 1450 ° C. Blowing (oxidation treatment) was terminated when the amount of the metal was reduced to about half, and then allowed to stand to separate into a molten oxide (slag) layer on the upper side and a molten metal (metal copper) layer on the lower side. The converter was tilted and the upper molten oxide layer was discharged into a ladle, leaving the molten metal (metallic copper) in the furnace. Table 2 shows the weight of both layers, the precious metal content, and the amount before and after the treatment.
上記のとおり、ＳｉＣ系物質中の白金族元素（Ｐｔ、Ｐｄ）および金をそれぞれ９７.５％、９７.６％、９７.７％という高収率且つ高濃度で溶融金属銅中に移行させて回収することができたことがわかる。 As described above, platinum group elements (Pt, Pd) and gold in SiC-based materials are transferred into molten metal copper in high yields and high concentrations of 97.5%, 97.6%, and 97.7%, respectively. It can be seen that it was recovered.
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