JP2011032553A - METHOD OF RECOVERING GOLD AND/OR PLATINUM GROUP ELEMENT FROM SiC-BASED SUBSTANCE - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve such a problem that it is an urgent necessity to establish a method in which the used material of a catalyst for purifying waste gas, using SiC being supposed to increase hereinafter as a carrier (base) material is treated to efficiently recover contained gold and/or platinum group element, because SiC is inactive and difficult to be oxidized. <P>SOLUTION: An SiC-based substance containing gold and/or platinum group element is fused and oxidized together with a slag having a composition in a range surrounded by points 1 to 5 of prescribed positions in a ternary phase diagram of CaO-SiO<SB>2</SB>-Al<SB>2</SB>O<SB>3</SB>or a slag comprising primarily the slag in a first furnace to produce a fused oxide, and the produced oxide is fused and reduced together with a reductant and metal copper or copper oxide in a second furnace to fractionate the produced oxide into a fused oxide layer and a fused metal layer and, thereby, the gold and/or platinum group element is extracted into the fused metal layer. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an exhaust gas purifying catalyst using silicon carbide (referred to as SiC) containing gold and / or platinum group elements in a supported form, and after use as a catalyst waste, The present invention relates to a method for efficiently recovering gold and / or platinum group elements from a SiC-based material containing gold and / or platinum group elements such as catalyst waste discarded before the mission is finished for some reason.

  In recent years, as described in Patent Documents 1 to 4 and the like, an exhaust gas purification system using a catalyst using SiC as a carrier (substrate) material for a gold and / or platinum group element has been put into practical use. Since SiC is excellent in heat resistance, it is expected to improve the performance and durability of the catalyst, particularly when used as a carrier material for a PM combustion catalyst for exhaust gas from a diesel engine, and its development is rapidly progressing and spreading.

  On the other hand, a method for recovering gold and / or platinum group elements from SiC-based materials such as catalyst waste after use that has finished its mission as a catalyst and catalyst waste that has been discarded before any mission has been completed Although a promising recovery method has been developed and put to practical use in Patent Documents 5 to 7, etc., SiC has a melting point of 2700 ° C. or higher, is chemically inert, and is essentially difficult to process, and is even more efficient. A method for treating a SiC-based material is desired.

JP-A-6-182214 JP-A-10-76162 JP 2001-349111 A JP 2003-262118 A JP 2007-224336 A JP 2008-88450 A JP 2008-88452 A

There is a problem that SiC is difficult to dissolve in a dry process, and according to Patent Document 5 using the above-described copper oxide slag, the mass ratio of SiC / Cu ₂ O is 0.2 at the maximum. Was limited.

Therefore, a method for treating the used material of the exhaust gas purification catalyst using SiC as a support (substrate) substance, which will be used more in the future, and recovering contained gold and / or platinum group elements more efficiently. Establishment is urgently needed.
In view of such a current situation, the present invention is intended to provide a method for recovering gold and / or platinum group elements contained in SiC-based materials more efficiently.

  The inventors of the present invention have studied a slag having a composition suitable for dissolving SiC, and injecting oxygen gas or oxygen-enriched air into the slag to oxidize the SiC-based material efficiently, thereby converting gold and platinum group elements. The inventors have found that it can be recovered and have completed the present invention.

That is, the present invention firstly provides a gold and / or platinum group element from a SiC-based material containing gold and / or a platinum group element (“gold and / or platinum group element” is sometimes referred to as “noble metal”). a method of recovering, the SiC-based material, CaO in _{CaO-SiO 2 -Al 2 O 3} 3 binary phase diagram, the composition of SiO _2, Al ₂ O ₃ (shown by mass%. forth.), respectively, 26.0%, 27.0%, 47.0% points 1, 55.0%, 35.0%, 10.0% points 2, 31.5%, 62.5%, 6.0% A slag having a composition within the range surrounded by point 3, 0.0%, 77.0%, 23.0% point 4, 8.0%, 45.0%, 47.0% point 5 A molten oxide is produced by melting and oxidizing in the first furnace together with the slag containing the slag as a main component, The produced oxide is melted and reduced in a second furnace together with a reducing agent and metallic copper or copper oxide, and separated into a molten oxide layer and a molten metal layer, whereby the gold and / or platinum group elements are obtained. A method for recovering gold and / or platinum group elements characterized by extracting the molten metal layer, and second, the gold and / or platinum group elements from a SiC-based material containing gold and / or platinum group elements. a method of recovering, the SiC-based material, CaO in _{CaO-SiO 2 -Al 2 O 3} 3 binary phase diagram, the composition of SiO _2, Al ₂ O _3, respectively, 26.0% 27.0% 47 0.0% point 1, 55.0%, 35.0%, 10.0% point 2, 31.5%, 62.5%, 6.0% point 3, 0.0%, 77. 0%, 23.0% point 4, 8.0%, 45.0%, 47.0% to point 5 And a slag having a composition within a range surrounded by the slag or a slag containing the slag as a main component, and melted and oxidized in the first furnace to form a molten oxide, and the generated oxide is reduced to a reducing agent and a metal. The gold and / or platinum group elements are extracted into the molten metal layer by melting and reducing treatment in a second furnace together with copper or copper oxide to separate the molten oxide layer and the molten metal layer, Provided is a method for recovering gold and / or platinum group elements, wherein at least a part of a molten oxide layer is used as a raw material for the slag in the first furnace.

In addition, the present invention thirdly relates to a method for recovering the gold and / or platinum group element from the SiC type material containing gold and / or platinum group element, wherein the SiC type material is CaO—SiO ₂ —Al ₂ O. ₃ Points 1, 55.0%, 35.0%, 10. Where the compositions of CaO, SiO ₂ and Al ₂ O ₃ in the ternary phase diagram are 26.0%, 27.0% and 47.0%, respectively. 0% point 2, 31.5%, 62.5%, 6.0% point 3, 0.0%, 77.0%, 23.0% point 4, 8.0%, 45.0 %, 47.0% of the slag having a composition in the range surrounded by the point 5 or slag mainly composed of the slag and metallic copper, and melted and oxidized in a first furnace to at least part of the metallic copper And oxidizing the SiC-based material into a molten layer of oxide and a molten layer of metal to thereby separate the gold And / or after the platinum group element is extracted into the molten layer of the metal, the oxide is melted and reduced in the second furnace together with the reducing agent to separate the molten oxide layer and the molten metal layer. The method for recovering gold and / or platinum group elements, characterized by extracting the gold and / or platinum group elements into the molten metal layer. Fourth, a SiC-based material containing gold and / or platinum group elements a method of recovering gold and / or platinum group elements from the SiC-based material, CaO in _{CaO-SiO 2 -Al 2 O 3} 3 binary phase diagram, the composition of SiO _2, Al ₂ O _3, respectively, 26 0.0%, 27.0%, 47.0% points 1, 55.0%, 35.0%, 10.0% points 2, 31.5%, 62.5%, 6.0% Point 3, 0.0%, 77.0%, 23.0% Point 4, 8.0%, 4 0.05% or 47.0% of the slag having a composition within the range surrounded by the point 5 or slag mainly composed of the slag and metallic copper, and melted and oxidized in a first furnace, and at least the metallic copper The gold and / or platinum group elements are extracted into the molten layer of the metal by oxidizing a part of the SiC-based material and separating it into a molten layer of the oxide and a molten layer of the metal, The gold and / or platinum group elements are extracted into the molten metal layer by melting and reducing treatment in a second furnace together with a reducing agent and separating into a molten oxide layer and a molten metal layer, and then the molten metal Provided is a method for recovering gold and / or platinum group elements, wherein a layer is used as the metallic copper in the first furnace.

Further, according to the fifth aspect of the present invention, in the method for recovering the gold and / or platinum group element from the SiC-based material containing gold and / or platinum group element, the SiC-based material is CaO—SiO ₂ —Al ₂ O. ₃ Points 1, 55.0%, 35.0%, 10. Where the compositions of CaO, SiO ₂ and Al ₂ O ₃ in the ternary phase diagram are 26.0%, 27.0% and 47.0%, respectively. 0% point 2, 31.5%, 62.5%, 6.0% point 3, 0.0%, 77.0%, 23.0% point 4, 8.0%, 45.0 %, 47.0% of the slag having a composition in the range surrounded by the point 5 or slag mainly composed of the slag and metallic copper, and melted and oxidized in a first furnace to at least part of the metallic copper And oxidizing the SiC-based material into a molten layer of an oxide and a molten layer of a metal. And / or after extracting the platinum group element into the molten layer of the metal, the oxide is melted and reduced in a second furnace together with a reducing agent to separate into a molten oxide layer and a molten metal layer, A method for recovering gold and / or platinum group elements, characterized in that at least a part of a molten oxide layer is used in the first furnace as a raw material for the slag. Sixth, containing gold and / or platinum group elements a method of recovering gold and / or platinum group elements from the SiC-based material which, the SiC-based material, CaO in _{CaO-SiO 2 -Al 2 O 3} 3 binary phase diagram, the composition of SiO _2, Al ₂ O ₃ 26.0%, 27.0%, 47.0% points 1, 55.0%, 35.0%, 10.0% points 2, 31.5%, 62.5%, 6 0.0% point 3, 0.0%, 77.0%, 23.0% point 4, 8.0 45.0%, 47.0% of the slag having a composition surrounded by the point 5 or the slag containing the slag as a main component and the metallic copper by melting and oxidizing in the first furnace And extracting the gold and / or platinum group elements into the molten layer of metal by oxidizing at least a part of the SiC-based material and separating the oxide-based material into a molten layer of oxide and a molten layer of metal, and then oxidizing the oxidized material. The product is melted and reduced in a second furnace together with a reducing agent, and is separated into a molten oxide layer and a molten metal layer, the molten metal layer is the metal copper, and at least a part of the molten oxide layer is the slag. A method for recovering gold and / or platinum group elements, characterized in that both are used in the first furnace as raw materials.

  Finally, according to the present invention, seventhly, the recovery method according to any one of first to sixth, wherein the oxidation treatment is performed by introducing oxygen gas or oxygen-enriched air into the first furnace. The recovery method according to any one of 1 to 7, wherein the molten oxide generated in the first furnace is discharged from the furnace and then brought into contact with water to be charged into the second furnace as a granular material. Ninth, the recovery method according to any one of the first to eighth aspects, wherein the slag is in a liquid phase at 1200 to 1600 ° C.

According to the present invention, a large amount of SiC-based material can be oxidized using low-cost slag, and gold and / or platinum group elements can be efficiently recovered.
In addition, the heat energy cost to be supplied by the heat generated by the oxidative decomposition of SiC, which is the main component of the raw material to be treated, and the heat of oxidation of the added metal copper in the first furnace is reduced, and the C content of SiC is combusted. As a result, the exhaust gas is discharged out of the system, and the Si component is oxidized to become the flux component Si oxide (SiO ₂ ), thereby reducing the flux cost to be supplied.
Furthermore, if at least a part of the oxide discharged from the second furnace is repeatedly used as the raw material for the slag in the first furnace, the slag cost can be reduced.
In addition, if the metal layer generated in the second furnace is repeatedly used as the metal copper in the method of charging the metal copper into the first furnace, the metal copper cost can be reduced.

_{CaO-SiO 2 -Al 2 O 3} 3 binary phase diagram showing the composition of the slag according to the present invention.

  The platinum group element in the present invention refers to 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 invention, the term “SiC-based material containing gold and / or platinum group elements” is a general term for substances mainly composed of SiC containing gold and / or platinum group elements in various forms. Preferably, it is a SiC-based material containing SiC in excess of 50% by mass, and may contain other additive substances, PM (particulate matter in 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.

In general, “slag” is a so-called slag formed by melting and integrating various oxides such as SiO ₂ , CaO, MgO, Al ₂ O ₃ , FeO, and MnO and by-produced in a metal smelting process. However, in the present invention, the slag charged into the first furnace is mainly composed of CaO, SiO ₂ and Al ₂ O ₃ so as to achieve the above-mentioned problem, and is defined so that the composition is in a specific range. is there.
By using the slag having the defined composition, it is possible to efficiently oxidize a SiC-based material containing gold and / or platinum group elements, further lower the melting point of the slag, and improve the fluidity.

  When a converter or rotary furnace is used as the first furnace (sometimes referred to as an oxidation furnace) in the present invention, contact / mixing of SiC-based material with slag or metallic copper is promoted by tilting or rotating as required. And can be oxidized by blowing oxygen gas or oxygen-enriched air over the surface with a lance. Furthermore, the molten oxide layer is first extracted by tilting after the oxidation treatment and then melted. Since the metal copper layer can be extracted, both layers can be easily separated.

Further, by directly blowing oxygen gas or oxygen-enriched air into the solution in the first furnace through a lance or tuyere, stirring of the solution can be promoted, and the oxidation rate of SiC can be further increased.
In addition, since the molten oxide after the oxidation treatment has a specific gravity smaller than that of the molten metal copper, it is melted by leaving the mixed melt (liquid phase) of the molten oxide and the molten metal copper after the oxidation treatment in the furnace. The oxide becomes the upper layer and the molten metal copper becomes the lower layer and is easily separated from each other.

In addition, an electric furnace can be used as the second furnace (sometimes referred to as a reduction furnace) in the present invention.
The molten oxide discharged from the first furnace is once cooled and stocked as a solid material is collected, charged into the second furnace, the electric furnace, and melted by adding a reducing agent and flux as required. Reduce. Since the unreacted SiC-based material brought in mixed with the molten oxide from the first furnace acts as a reducing agent in the second furnace and is oxidatively decomposed, the second furnace reduces an insufficient amount as necessary. What is necessary is just to add an agent.
Note that the molten oxide and molten metal copper produced in the electric furnace are easily separated from each other, with the molten oxide as the upper layer and the molten metal copper as the lower layer. Can be collected separately.

  When the molten oxide discharged from the first furnace is brought into contact with a large amount of water to form a granular material (that is, granulated), unreacted SiC brought into the molten oxide. Since the system substance is exposed on the surface of the fine particles of the granular material, the reactivity as the reducing agent is significantly accelerated in the second furnace.

The SiC-based material containing gold and / or platinum group element, CaO in _{CaO-SiO 2 -Al 2 O 3} 3 binary phase diagram, the composition of SiO _2, Al ₂ O _3, respectively 26.0% 27. 0%, 47.0% point 1, 55.0%, 35.0%, 10.0% point 2, 31.5%, 62.5%, 6.0% point 3, 0.0 %, 77.0%, 23.0% point 4, 8.0%, 45.0%, 47.0%, or a slag having a composition within a range surrounded by point 5 or the slag as a main component The molten oxide is produced by melting and oxidizing treatment in the first furnace together with the slag, and the produced oxide is melted and reduced in the second furnace together with the reducing agent and metallic copper or copper oxide to obtain the molten oxide. The gold and / or platinum group elements are extracted into the molten metal layer by separating into a molten metal layer and a molten metal layer. Correspondingly, speaking invention in more detail using at least a portion of the molten oxide layer in the first furnace as a raw material for the slag, it is as follows.

1. The SiC-based material and the slag are charged into an oxidation furnace (first furnace), and a uniform oxide solution is formed while oxidizing with oxygen gas or oxygen-enriched air.
In the present invention, the oxygen-enriched air is not particularly limited in terms of oxygen concentration, but an oxygen concentration of 40% (represented by volume ratio, the same applies hereinafter) or higher is preferable from the viewpoint of improving the oxidation treatment speed.
2. In the present invention, the oxide solution is granulated and dried as a powder, charged into a reduction furnace (second furnace, preferably an electric furnace) with flux, metallic copper or copper oxide, coke, and melted and reduced. The molten metal layer (also referred to as molten copper) and molten oxide (also referred to as molten slag) in which gold and platinum group elements are melted are separated into two layers.
3. Most of the gold and platinum group elements migrate into the molten copper produced in the electric furnace.
4). Since the molten slag discharged from the electric furnace contains almost no gold or platinum group elements, it can be discarded or reused for roadbed materials, etc., but at least a part of the molten slag is repeatedly used in the first furnace as the raw material of the slag. Can be charged.
5). The molten copper produced in the electric furnace is further oxidized to further concentrate the gold and platinum group elements while oxidizing the copper content.

The SiC-based material containing gold and / or platinum group element, CaO in _{CaO-SiO 2 -Al 2 O 3} 3 binary phase diagram, the composition of SiO _2, Al ₂ O _3, respectively 26.0% 27. 0%, 47.0% point 1, 55.0%, 35.0%, 10.0% point 2, 31.5%, 62.5%, 6.0% point 3, 0.0 %, 77.0%, 23.0% point 4, 8.0%, 45.0%, 47.0%, or a slag having a composition within a range surrounded by point 5 or the slag as a main component The gold and the metal copper are melted and oxidized in a first furnace together with slag and oxidized to separate at least a part of the metal copper and the SiC-based material into a molten oxide layer and a molten metal layer. After extracting the platinum group element into the molten layer of the metal, the oxide is melted in the second furnace together with the reducing agent. And reducing the molten oxide layer and the molten metal layer, and if necessary, the molten metal layer is the metal copper and at least a part of the molten oxide layer is the raw material for the slag. More specifically, the invention used in the furnace is as follows.

1. The first furnace is loaded with SiC-based material, the slag, and metallic copper (which may contain impurities such as metallic copper produced in the second furnace or nugget copper obtained by crushing a copper wire to 2 to 3 mm). While entering and oxidizing with oxygen gas or oxygen-enriched air, at least a part of metallic copper and the SiC-based material are oxidized and separated into two layers of an oxide solution layer and a molten metal layer centered on the molten copper.
In this case, it is preferable to oxidize 10 to 70% of the charged metal copper, and it is more preferable to oxidize 15 to 55%.
2. Most gold and platinum group elements migrate into the molten copper.
3. The molten copper is further oxidized to further concentrate the gold and platinum group elements while oxidizing the copper content.
4). The oxide solution is granulated and dried as a powder and charged into a reduction furnace (second furnace, preferably an electric furnace) together with flux and coke.
5). Since the molten slag discharged from the electric furnace contains almost no gold or platinum group elements, it can be discarded or reused for roadbed materials, etc., but at least a part of the molten slag is repeatedly used in the first furnace as the raw material for the slag. Can be charged.
6). If the molten copper produced | generated with the electric furnace is inserted into a 1st furnace as metallic copper, new metallic copper can be saved and cost reduction can be aimed at.

In the slag used in the present invention, the composition of CaO, SiO ₂ and Al ₂ O _{3 in} the CaO—SiO ₂ —Al ₂ O ₃ ternary phase diagram is 26.0%, 27.0% and 47.0%, respectively. Point 1, 55.0%, 35.0%, 10.0% Point 2, 31.5%, 62.5%, 6.0% Point 3, 0.0%, 77.0%, 23 Slag having a composition within a range surrounded by points 5 of 0.0% point 4, 8.0%, 45.0%, 47.0% or the slag as a main component (preferably the content of the slag is 80 Mass% or more). The slag having this specific composition can be melted at 1200 to 1600 ° C. to efficiently oxidize a SiC-based material containing gold and / or platinum group elements, and further improve the fluidity of the slag.
If the slag is outside the above predetermined range, all of the low melting point, the oxidation treatment efficiency, and the high fluidity cannot be satisfied.

In the present invention, the amount of SiC-based material processed using the predetermined slag, that is, the mass ratio of SiC / slag is 1.14 at the maximum, preferably 0.03 to 0.67.
Moreover, it is preferable that the SiC type | system | group substance in this invention is a particle size which passes a 5 mm sieve, More preferably, it is a 0.1-3.0 mm diameter.

In all the following examples, slag having a composition of CaO, SiO ₂ and Al ₂ O ₃ of 30.0%, 35.0% and 35.0%, respectively, was used.

[Example 1-1]
The composition of the SiC-based material (also referred to as SiC raw material) (the solid composition is expressed by mass ratio in both% and ppm) is SiC 95%, and represents the content of gold and platinum group elements (Pt, Pd, Rh). It is shown in 1.

The operation procedure is shown below.
1. 285 kg of the slag having the predetermined composition was charged into an oxidation furnace.
2. 263 kg of SiC raw material was charged into an oxidation furnace.
3. For 24 hours after charging, oxygen-enriched air of 40% oxygen (gas composition is volume ratio) was blown at 55 m ³ / hour while heating with a heavy oil burner.
4). After completion of the blowing, the oxidation furnace was tilted to take out the molten oxide. The extracted oxide was water-crushed and dried. As a result, 675 kg of dried oxide was obtained.
5). The total amount of the oxide obtained, 210 kg of copper oxide, 170 kg of quicklime, and 20 kg of coke were charged into an electric furnace and melted and reduced at 1350 ° C.
6). As a result of the smelting reduction, it was separated into an upper layer oxide and a lower layer molten metal.
7). The mass of the molten metal in the lower layer was 168 kg.
8). It was confirmed that the copper quality in the upper layer oxide (slag) was 0.5%, the Pt, Pd, Rh, and Au quality was less than 10 ppm as shown in Table 2, and the recovery rate was 99% or more.
9. At least a part of 850 kg of slag discharged from the electric furnace was repeated to the oxidation furnace as a raw material for slag. In this case, in the oxidation furnace, a slag composition was adjusted by adding a flux component necessary for constituting a predetermined slag composition as needed.

[Example 1-2]
The composition of the SiC raw material is SiC 95%, and the content of platinum group elements (Pt, Ru) is shown in Table 3.

The operation procedure is shown below.
1. 228 kg of the slag having the predetermined composition was charged into an oxidation furnace.
2. 210 kg of SiC raw material was charged into an oxidation furnace.
3. 24 hours after charging, oxygen-enriched air of 40% oxygen was blown at 44 m ³ / hour while heating with a heavy oil burner.
4). After completion of the blowing, the oxidation furnace was tilted to take out the molten oxide. The extracted oxide was water-crushed and dried. As a result, 540 kg of dried oxide was obtained.
5). The total amount of the oxide obtained, 168 kg of copper oxide, 137 kg of quicklime, and 15 kg of coke were charged into an electric furnace and melted and reduced at 1350 ° C.
6). As a result of the smelting reduction, it was separated into an upper layer oxide and a lower layer molten metal.
7). The mass of the molten metal in the lower layer was 135 kg.
8). It was confirmed that the copper grade in the upper layer oxide (slag) was 0.5%, the Pt and Ru grades were less than 10 ppm as shown in Table 4, and the recovery rate was 99% or more.
9. At least a part of 678 kg of slag discharged from the electric furnace was repeated to the oxidation furnace as slag raw material. In this case, in the oxidation furnace, a slag composition was adjusted by adding a flux component necessary for constituting a predetermined slag composition as needed.

[Example 1-3]
The composition of the SiC raw material is SiC 95%, and the content of platinum group elements (Pt, Ir) is shown in Table 5.

The operation procedure is shown below.
1. 172 kg of slag having the predetermined composition was charged into an oxidation furnace.
2. 158 kg of SiC raw material was charged into an oxidation furnace.
3. 24 hours after charging, oxygen-enriched air of 40% oxygen was blown at 33 m ³ / hour while heating with a heavy oil burner.
4). After completion of the blowing, the oxidation furnace was tilted to take out the molten oxide. The extracted oxide was water-crushed and dried. As a result, 405 kg of dried oxide was obtained.
5). The total amount of the oxide obtained, 126 kg of copper oxide, 100 kg of quicklime, and 12 kg of coke were charged into an electric furnace and melted and reduced at 1350 ° C.
6). As a result of the smelting reduction, it was separated into an upper layer oxide and a lower layer molten metal.
7). The mass of the molten metal in the lower layer was 100 kg.
8). It was confirmed that the copper grade in the upper layer oxide (slag) was 0.5%, the Pt and Ir grades were less than 10 ppm as shown in Table 6, and the recovery rate was 99% or more.
9. At least a part of 512 kg of slag discharged from the electric furnace was repeated to the oxidation furnace as a raw material for slag. In this case, in the oxidation furnace, a slag composition was adjusted by adding a flux component necessary for constituting a predetermined slag composition as needed.

[Example 2-1]
The SiC raw material having the same composition as in Example 1-1 (Table 1) was used. Moreover, the nugget copper obtained by crushing a copper wire to 2-3 mm is Cu 99.9%, and does not contain Pt, Pd, Rh, Au, Ru, and Ir.

The operation procedure is shown below.
1. 600 kg of nugget copper was charged into the oxidation furnace.
2. 285 kg of the slag having the predetermined composition was charged into an oxidation furnace.
3. 263 kg of SiC raw material was charged into an oxidation furnace.
4). After charging, while heating with a heavy oil burner, oxygen-enriched air of 40% oxygen was blown at 55 m ³ / hour until the amount of charged metal copper reached 50%.
5). After completion of the blowing, the oxidation furnace was allowed to stand and separated into a molten oxide layer and a molten metal copper layer, and then the oxidation furnace was tilted to take out the molten oxide. The extracted oxide was water-crushed and dried. As a result, 1010 kg of dried oxide was obtained.
6). The molten metal copper was 300 kg, and most of the gold and platinum group elements were transferred therein.
7). The total amount of the oxide obtained, 170 kg of quicklime, and 28 kg of coke were charged into an electric furnace and melt-reduced at 1300 ° C.
7). As a result of the smelting reduction, it was separated into an upper layer oxide and a lower layer molten metal.
8). The mass of the molten metal produced in the electric furnace was 320 kg.
9. Confirmed that the copper grade in the oxide (slag) discharged from the electric furnace is 0.5%, Pt, Pd, Rh, Au grade is less than 10ppm as shown in Table 7, and the recovery rate is 99% or more. did.
10. The molten metal obtained in the electric furnace was charged into the oxidation furnace as metallic copper instead of at least part of the nugget copper.
11. At least a part of 820 kg of slag discharged from the electric furnace was repeated to the oxidation furnace as a raw material for slag. In this case, in the oxidation furnace, a slag composition was adjusted by adding a flux component necessary for constituting a predetermined slag composition as needed.

[Example 2-2]
The SiC raw material having the same composition as in Example 1-2 was used. Moreover, nugget copper is Cu 99.9% and does not contain Pt, Pd, Rh, Au, Ru, and Ir.

The operation procedure is shown below.
1. 480 kg of nugget copper was charged into the oxidation furnace.
2. 228 kg of the slag having the predetermined composition was charged into an oxidation furnace.
3. 210 kg of SiC raw material was charged into an oxidation furnace.
4). After the above charging, oxygen enriched air of 40% oxygen was blown at 44 m ³ / hour while heating with a heavy oil burner until the amount of charged metal copper reached 50%.
5). After completion of the blowing, the oxidation furnace was allowed to stand and separated into a molten oxide layer and a molten metal copper layer, and then the oxidation furnace was tilted to take out the molten oxide. The extracted oxide was water-crushed and dried. As a result, 810 kg of dried oxide was obtained.
6). The molten metal copper was 240 kg, and most of the gold and platinum group elements were transferred therein.
7). The total amount of the oxide obtained, 135 kg of quicklime, and 22 kg of coke were charged into an electric furnace and melted and reduced at 1300 ° C.
8). As a result of the smelting reduction, it was separated into an upper layer oxide and a lower layer molten metal.
9. The mass of the molten metal obtained in the electric furnace was 255 kg.
10. It was confirmed that the copper quality in the oxide (slag) discharged from the electric furnace was 0.5%, the Pt and Ru quality was less than 10 ppm as shown in Table 8, and the recovery rate was 99% or more.
11. The molten metal obtained in the electric furnace was charged into the oxidation furnace as metallic copper instead of part of the nugget copper.
12 At least a part of 657 kg of slag discharged from the electric furnace was repeated to the oxidation furnace as slag raw material. In this case, in the oxidation furnace, the slag composition was adjusted by adding a flux component constituting the slag as necessary.

[Example 2-3]
The SiC raw material having the same composition as in Example 1-3 was used. Moreover, nugget copper is Cu 99.9% and does not contain Pt, Pd, Rh, Au, Ru, and Ir.

The operation procedure is shown below.
1. 360 kg of nugget copper was charged into the oxidation furnace.
2. 172 kg of slag having the predetermined composition was charged into an oxidation furnace.
3. 158 kg of SiC raw material was charged into an oxidation furnace.
4). After the above charging, oxygen enriched air of 40% oxygen was blown at 33 m ³ / hour while heating with a heavy oil burner until the amount of charged metal copper reached 83%.
5). After completion of the blowing, the oxidation furnace was allowed to stand and separated into a molten oxide layer and a molten metal copper layer, and then the oxidation furnace was tilted to take out the molten oxide. The extracted oxide was water-crushed and dried. As a result, 605 kg of dried oxide was obtained.
6). The molten metal copper was 300 kg, and most of the gold and platinum group elements were transferred therein.
7). The total amount of the oxide obtained, 100 kg of quicklime, and 6 kg of coke were charged into an electric furnace and melted and reduced at 1300 ° C.
8). As a result of the smelting reduction, it was separated into an upper layer oxide and a lower layer molten metal.
9. The mass of the molten metal obtained in the electric furnace was 193 kg.
10. It was confirmed that the copper grade in the oxide (slag) discharged from the electric furnace was 0.5%, the Pt and Ir grades were less than 10 ppm as shown in Table 9, and the recovery rate was 99% or more.
11. The molten metal obtained in the electric furnace was charged into the oxidation furnace as metallic copper instead of at least part of the nugget copper.
12 At least a part of 495 kg of slag discharged from the electric furnace was repeated to the oxidation furnace as slag raw material. In this case, in the oxidation furnace, the slag composition was adjusted by adding a flux component constituting the slag as necessary.

Claims (9)

A method of recovering gold and / or platinum group elements from the SiC-based material containing gold and / or platinum group element, the SiC-based material, CaO in _{CaO-SiO 2 -Al 2 O 3} 3 binary phase diagram, The composition of SiO ₂ and Al ₂ O ₃ is 26.0%, 27.0%, 47.0% points 1, 55.0%, 35.0%, 10.0% points 2, 31. 5%, 62.5%, 6.0% point 3, 0.0%, 77.0%, 23.0% point 4, 8.0%, 45.0%, 47.0% point 5 is melted and oxidized in the first furnace together with slag having a composition within a range surrounded by 5 or a slag mainly composed of the slag to produce a molten oxide, and the produced oxide is reduced with a reducing agent and a metal. Fused and reduced in the second furnace together with copper or copper oxide to separate into molten oxide layer and molten metal layer Gold and / or recovery of PGM, characterized in that to extract the gold and / or platinum group element into the molten metal layer by a. A method of recovering gold and / or platinum group elements from the SiC-based material containing gold and / or platinum group element, the SiC-based material, CaO in _{CaO-SiO 2 -Al 2 O 3} 3 binary phase diagram, The composition of SiO ₂ and Al ₂ O ₃ is 26.0%, 27.0%, 47.0% points 1, 55.0%, 35.0%, 10.0% points 2, 31. 5%, 62.5%, 6.0% point 3, 0.0%, 77.0%, 23.0% point 4, 8.0%, 45.0%, 47.0% point 5 is melted and oxidized in the first furnace together with slag having a composition within a range surrounded by 5 or a slag mainly composed of the slag to produce a molten oxide, and the produced oxide is reduced with a reducing agent and a metal. Fused and reduced in the second furnace together with copper or copper oxide to separate into molten oxide layer and molten metal layer And the gold and / or platinum group element is extracted into the molten metal layer by using at least a part of the molten oxide layer as a raw material for the slag in the first furnace. Or a platinum group element recovery method. A method of recovering gold and / or platinum group elements from the SiC-based material containing gold and / or platinum group element, the SiC-based material, CaO in _{CaO-SiO 2 -Al 2 O 3} 3 binary phase diagram, The composition of SiO ₂ and Al ₂ O ₃ is 26.0%, 27.0%, 47.0% points 1, 55.0%, 35.0%, 10.0% points 2, 31. 5%, 62.5%, 6.0% point 3, 0.0%, 77.0%, 23.0% point 4, 8.0%, 45.0%, 47.0% point And slag having a composition within a range surrounded by 5 or slag mainly composed of the slag and metallic copper, and melted and oxidized in a first furnace to oxidize at least a part of the metallic copper and the SiC-based material. The gold and / or platinum group by separating into a molten layer of oxide and a molten layer of metal After the element is extracted into the molten layer of the metal, the oxide and the reducing agent are melted and reduced in a second furnace and separated into a molten oxide layer and a molten metal layer. A method for recovering gold and / or platinum group elements, comprising extracting platinum group elements into the molten metal layer. A method of recovering gold and / or platinum group elements from the SiC-based material containing gold and / or platinum group element, the SiC-based material, CaO in _{CaO-SiO 2 -Al 2 O 3} 3 binary phase diagram, The composition of SiO ₂ and Al ₂ O ₃ is 26.0%, 27.0%, 47.0% points 1, 55.0%, 35.0%, 10.0% points 2, 31. 5%, 62.5%, 6.0% point 3, 0.0%, 77.0%, 23.0% point 4, 8.0%, 45.0%, 47.0% point And slag having a composition within a range surrounded by 5 or slag mainly composed of the slag and metallic copper, and melted and oxidized in a first furnace to oxidize at least a part of the metallic copper and the SiC-based material. The gold and / or platinum group by separating into a molten layer of oxide and a molten layer of metal After the element is extracted into the molten layer of the metal, the oxide and the reducing agent are melted and reduced in a second furnace and separated into a molten oxide layer and a molten metal layer. A method for recovering gold and / or platinum group elements, wherein after the platinum group elements are extracted into the molten metal layer, the molten metal layer is used as the metallic copper in the first furnace. A method of recovering gold and / or platinum group elements from the SiC-based material containing gold and / or platinum group element, the SiC-based material, CaO in _{CaO-SiO 2 -Al 2 O 3} 3 binary phase diagram, The composition of SiO ₂ and Al ₂ O ₃ is 26.0%, 27.0%, 47.0% points 1, 55.0%, 35.0%, 10.0% points 2, 31. 5%, 62.5%, 6.0% point 3, 0.0%, 77.0%, 23.0% point 4, 8.0%, 45.0%, 47.0% point And slag having a composition within a range surrounded by 5 or slag mainly composed of the slag and metallic copper, and melted and oxidized in a first furnace to oxidize at least a part of the metallic copper and the SiC-based material. The gold and / or platinum group by separating into a molten layer of oxide and a molten layer of metal After the element is extracted into the molten layer of the metal, the oxide is melted and reduced in the second furnace together with the reducing agent to separate into a molten oxide layer and a molten metal layer. A method for recovering gold and / or platinum group elements, wherein at least a part is used as a raw material for the slag in the first furnace. A method of recovering gold and / or platinum group elements from the SiC-based material containing gold and / or platinum group element, the SiC-based material, CaO in _{CaO-SiO 2 -Al 2 O 3} 3 binary phase diagram, The composition of SiO ₂ and Al ₂ O ₃ is 26.0%, 27.0%, 47.0% points 1, 55.0%, 35.0%, 10.0% points 2, 31. 5%, 62.5%, 6.0% point 3, 0.0%, 77.0%, 23.0% point 4, 8.0%, 45.0%, 47.0% point And slag having a composition within a range surrounded by 5 or slag mainly composed of the slag and metallic copper, and melted and oxidized in a first furnace to oxidize at least a part of the metallic copper and the SiC-based material. The gold and / or platinum group by separating into a molten layer of oxide and a molten layer of metal After the element is extracted into the molten layer of the metal, the oxide is melted and reduced in a second furnace together with a reducing agent to separate the molten oxide layer and the molten metal layer, A method for recovering gold and / or platinum group elements, characterized by using metallic copper and at least a part of the molten oxide layer as a raw material for the slag in the first furnace.   The recovery method according to claim 1, wherein the oxidation treatment is performed by introducing oxygen gas or oxygen-enriched air into the first furnace.   The molten oxide generated in the first furnace is charged into the second furnace as a granular material by contacting with water after being discharged from the furnace. Collection method.   The recovery method according to any one of claims 1 to 8, wherein the slag is in a liquid phase at 1200 to 1600 ° C.

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