JP2001040431A - Method for recovering valuable matter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the fluidity of slag and to smoothly recover valuable metal by treating copper residues contg. valuable metal and industrial waste contg. metal and, while the generated slag is reduced, feeding a solvent contg. at least one kind among CaO, SiO2 and Fe therein. SOLUTION: Preferably, the flowing length of slag after the addition of a solvent is >=18 cm, where stainless strip steel with a V type groove of 5 cm width inclined in the longitudinal direction at 7.5 deg. inclined angle is heated at 200 to 250 deg.C in such a manner that the groove face is orientated toward the upper direction, the slag of 150 g is flowed down from the upper direction of 10 cm to the groove face, and, by the length in which it has flowed off the groove face, its fluidity is measured. Moreover, the slag is composed of, by weight, 5 to 35% Cu2O, 5 to 17% FeO, 1 to 15% ZnO, 20 to 45% SiO2, 25 to 45% CaO and 10 to 20% Al2O3. The slag G is poured into an electric type holding furnace 31, and a graphite electrode is inserted into the slag bath, which is energized and melted. For optimizing the viscosity of the slag G, jointly with reduction, a solvent is continuously poured, and refining is executed. Black copper I having about 70 to 90% copper grade can be obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for recovering valuable resources from slag, and more particularly, to a slag containing valuable metals and an industry containing metals in a fluidized bed gasification and melting furnace. The present invention relates to a method for recovering valuable resources from slag generated when processing waste.

[0002]

2. Description of the Related Art A fluidized-bed gasification and melting furnace is known, for example, from Japanese Patent Application Laid-Open No. Hei 10-132237, in which waste such as municipal waste is decomposed in a pyrolysis furnace to generate a pyrolysis gas. The pyrolysis residue is self-burned in a swirling melting furnace after removing the metal component. Further, according to JP-A-10-202225, a fluidized-bed gasification furnace for gasifying waste at a low temperature and a melting furnace for treating gaseous matter and char are used. Discloses a gasification and melting furnace for slagging. In the slag generated when processing industrial waste containing metals in a gasification melting furnace, unoxidized metal may be mixed in a molten state, so in this publication, it is discharged from the melting furnace A slag is introduced into the electric furnace to separate the metal from the slag.

[0003] In "Resources and Materials" (December 1997, "Special Issue on Recycling", pages 1022 to 1038), various shredder dust treatment methods are introduced.

In Japanese Patent Application No. 10-115629 (filed on Apr. 24, 1998), the present applicant puts copper slag and industrial waste into a fluidized-bed gasifier, and pneumatically feeds air from the lower part of the gasifier. To form a fluidized bed and gasify a part of the industrial waste by pyrolysis to recover the first incombustibles containing valuable metals from the gasifier, and to supply air from the lower part of the gasifier to the melting furnace. A second non-combustible material containing valuable metal and a pyrolysis gas generated in the gasification furnace, which are increased by swirling, to generate slag containing valuable metal, and separate and collect the valuable slag. A recovery method was proposed. In this method, Al, Cu, and the like contained in the industrial waste are contained in the first incombustible substance and are discharged together with the exhaust gas. The metal scraps on the screen are sorted by a magnetic separator to remove Fe scrap and other Cu.
Scrap, Al scrap, and copper slag containing Cu ₂ O are sorted out. The copper slag is reduced with graphite in an electric furnace, and black copper is recovered.

[0005] The slag generated when treating industrial waste containing copper slag and metals in a gasification melting furnace contains copper oxide. Generally, as a method for recovering copper from slag containing copper oxide, iron sulfide is put into molten slag to convert copper oxide into copper sulfide (FeS + Cu ₂ O → F).
There is known a method of separating and recovering slag from slag by producing an eO + Cu ₂ S) mat, and a method of separating and recovering copper oxide as metallic copper from slag by reducing slag using a hydrocarbon gas or solid carbon as a reducing agent. Have been.

[0006]

However, when iron sulfide is used, sulfur contained in iron sulfide is partially oxidized and S
Since O ₂ is generated, a desulfurization facility from exhaust gas is required. In addition, slag generated when treating waste containing metal and industrial waste containing metal in a gasification and melting furnace has a high copper oxide content, and metal slag is reduced from slag by a reduction method using graphite. In the process of separating the slag, the melting point rises due to a large change in the slag composition, and the fluidity drops drastically.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention reduces at least copper by reducing copper slag containing valuable metals and slag produced by treating industrial waste containing metals. In the method of recovering as valuables, while improving the fluidity of the slag while performing the reduction, specifically, CaO, whose flow length is 18 cm or more,
Provided is a method for recovering valuable resources, which comprises supplying a solvent containing at least one of SiO ₂ and Fe to the slag. However, as shown in FIG. 1, the flow length of 18 cm is a width of 5 cm inclined in the length direction at an inclination angle of 7.5 °.
Of the V-shaped grooved stainless steel strip with the groove face up and 20
Heat to 0-250 ° C and apply 1 cm
50 g of the slag is caused to flow down, and the fluidity of the slag is measured by the length of the slag flowing down the groove surface. Hereinafter, the present invention will be described in detail.

By the way, the composition of the slag generated when treating copper slag containing valuable metals and industrial waste containing metals in a gasification and melting furnace greatly differs depending on the raw material to be treated. An example is shown in Table 1.

[0009]

[Table 1]

When copper oxide is recovered from copper slag by reduction from the above-mentioned slag, copper oxide (Cu
_When 2O) is made of metallic copper, metallic copper separates from slag and precipitates and precipitates, so that slag is changed to one containing no Cu ₂ O, and fluidity is reduced. No. 1 of the slags in Table 1 was used. For methods 6, 7, 9, 12, and 15, a method using both reduction with an iron pipe and air blowing (condition—paragraph [00]
28]). Table 2 shows the results. Table 1
The reduction results for 6, 7, 9, 12, and 15 are 6 ', 7', 9 ', 12', and 15 ', respectively.

[0011]

[Table 2]

The metal recovered by this reduction is Cu85
-90%, Fe1-6%, Zn1-3%. Table 2
And 3, the slag No. 6, 9, and 12, it can be seen that FeO generated simultaneously with the reduction functions as a solvent and improves the fluidity. On the other hand, No. 7 and 15
The slag has a significantly reduced fluidity. The reason why the fluidity of the slag is improved on the one hand and reduced on the other hand is the Anorthite-SiO ₂ -CaO phase diagram, Anorthite
I tried to see to elucidate the like -CaO · SiO ₂ -FeO system phase diagram, but explanation based on the state diagram has been difficult. Empirically, the fluidity of the slag after reducing Cu ₂ O to metallic Cu is increased by (a) increasing the FeO content in the slag, and (b) when the above (a) is not satisfied,
In addition to (a), the content is increased by increasing the content of CaO and / or SiO ₂ and, if necessary, decreasing the content of Al ₂ O ₃ . That is, the slag No. 6 ′, 9 ′ and 12 ′ correspond to the above (A), and the slag Nos. 7 'not only greatly increases the FeO content, but also CaO and Si
Since it is necessary to increase the O ₂ content and reduce the Al ₂ O ₃ content, this corresponds to the above (b). Slug N
o. Slag No. 15 ′ is slag No. 15 in that it has a large unreduced Cu ₂ O content. 6 ', 7', 9 'and 12'
On the other hand, slag Nos. 21 is similar except for the FeO content. For this reason, when the content of Cu ₂ O is increased to 6.5% or more, the above (A) is not effective, and the content of CaO and SiO ₂ is increased and the content of Al ₂ O ₃ is increased by the above (B). It is necessary to reduce the content.

As the solvent, a substance containing SiO ₂ , such as silicate ore, and calcium carbonate as a substance containing CaO can be used. If the solvent forms SiO ₂ in SiO ₂ itself or slag, it can be used, for example. SiO ₂ -containing materials such as silica sand and Fayalite slag can also be used as the solvent. In addition, CaO-containing substances can also be used as the solvent. For example, Ca (O) -containing substances such as Ca (O
H) ₂ , CaO, and other CaO-containing substances can also be used as the solvent.

According to the method of the present invention, the slag before reduction is Cu ₂
O: 5 to 35% by weight, FeO: 5 to 17% by weight, Zn
O: 1 to 15 wt%, SiO _2: 20~45 wt%, C
aO-: 25 to 45 wt%, Al ₂ O _3: 10~20 wt%
Can be preferably applied. In the present invention, a solvent such as SiO ₂ is added while Cu ₂ O is reduced with graphite, for example. Specifically, since the melting point of the slag rises simultaneously with the reduction of Cu ₂ O by the graphite electrode of the electric furnace, SiO _{2 and the} like are continuously introduced into the slag by using a shoe provided in the electric furnace. I do. If the charging is interrupted, the melting point of the slag rises and the fluidity decreases. Therefore, even if charging is restarted, the solvent hardly dissolves into the slag.

Further, according to one embodiment of the present invention, the supply sources of the reducing agent and the solvent can be made common. That is, the reduction reaction of copper oxide by using metallic iron _{(Cu 2 O + Fe → FeO} + 2Cu) iron oxide produced by the (FeO becomes the solvent lowers the melting point of the slag as a reducing agent. Thereto, together SiO ₂ and CaO And add
Further effects can be obtained with respect to the addition of the melting point of copper slag.

[0016] The addition of FeO as solvent, a hydrocarbon gas or a solid carbon as a reducing agent, Cu ₂ in the slag
It can also be carried out by a method of adding FeO from the outside while reducing O. In another embodiment utilizing a redox reaction caused by the difference in affinity between copper and iron oxygen,
When contacting the metallic iron to slag containing Cu ₂ O, Cu ₂
O + Fe → FeO + 2Cu reaction occurs to generate Cu ₂ O and an equimolar amount of FeO. Therefore, 1 mol of Fe is substituted for 1 mol of Cu ₂ O removed from the slag by the reduction reaction.
O will be supplied. When metal iron is oxidized with oxygen, magnetite (Fe ₃ O ₄ ) having a high melting point may be generated. Therefore, an oxidation method that does not increase the oxygen potential, specifically, a method of adding solid carbon, It is preferable to generate Fayalite (2FeO.SiO ₂ ), which is a low-melting compound, by adding SiO ₂ .

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention, in particular,
An embodiment of a method for adding a solvent will be described with reference to the drawings.
FIG. 2 is a schematic configuration diagram showing a process of converting copper slag, a solvent, and industrial waste into exhaust gas and slag, and recovering valuable metals. FIG. 3 is a diagram showing a structure of a fluidized-bed gasifier for separating copper slag and industrial waste into pyrolysis gas and incombustible particles. FIG. 4 is a diagram showing a structure of a melting furnace that burns a pyrolysis gas containing incombustible particles and generates slag.

As shown in the schematic diagram of FIG.
Is stored in the first storage 1 and the industrial waste A2 containing metal
Etc. are stored in another second storage 2. The copper slag A1 and the solvent A3 are finely crushed by a crusher (not shown) from the first storage 1 and are supplied to the supply feeder 4 by the supply conveyor 3 by the supply conveyor 3 in the same manner as the crushed industrial waste A2 and the like. At this time, a step of removing large scraps of iron by applying a magnetic separator (not shown) may be provided. Next, a fixed amount is supplied from the supply feeder 4 into the fluidized bed gasifier 11.
Here, the sludge B can be introduced into the fluidized-bed gasification furnace 11 by a supply feeder (not shown) separately from the copper slag A1 and the solvent A3. The sludge B includes sewage sludge generated from general sewage, night soil sludge, neutralized sludge generated from wastewater treatment, and the like. Here, the copper slag A1 is preferably a slag having a copper grade of 20 to 80%. If the copper grade is 20% or less, the cost of variable costs becomes large, and if the Cu grade is 80% or more, it is more advantageous to solidify by some means and put it into a copper smelting converter plant. For the above reasons, the Cu grade is 30 to 50
% Is more preferable.

In the fluidized bed gasifier 11, as shown in FIG. 3, the input industrial waste A 2, copper slag A 1 and solvent A 3 are supplied into the gasifier 11 by air C pushed from a fluidized bed 12. Circulates in a fluidized bed (1)
3). The inside of the gasification furnace 11 is set to a temperature of 400 to 600 ° C.
Industrial waste A2 by reducing the air ratio to a reducing atmosphere
The waste plastic is pyrolyzed and gasified while controlling the combustion of the waste plastic. The temperature inside the gasification furnace 11 is 400 ° C.
Below, waste plastic is difficult to gasify, 600 ℃
Above it burns, more preferably 500 to 550
° C is good. The air C is sent in a speed range of 0.5 to 2.0 m / sec. Preferably, 1.5 m / se
c is good. When the speed is in this range, the copper slag particles float in the fluidized bed 13, and the particles collide with each other to gradually become spherical, and are pulverized to be finely divided.

The incombustibles containing copper slag which is not refined in the gasification furnace 11 is recovered outside the gasification furnace 11 from the side of the fluidized bed 12. Further, the pyrolysis gas E generated in the gasification furnace 11, the copper slag having a diameter of 100 to 250 μm containing pulverized Cu ₂ O, and the incombustible substance D2 of valuable metal having a high vapor pressure separated from waste plastic are melted. It is transferred directly to the furnace 21. At this time, the waste liquid L can be sprayed into the gasification furnace 11 from the furnace top by a spraying water pump (not shown). This is for maintaining the atmosphere in the gasification furnace 11 at the processing temperature.
The waste liquid includes ordinary waste acid and waste alkali.

In the melting furnace 21, as shown in FIG. 4, at the same time as the pyrolysis gas E or the like flows in, the air is supplied to make the air ratio 0.9 to 0.3 to oxidize the atmosphere, thereby In addition to burning gas, Al, F in industrial waste
Metals such as e and Cu are oxidized and melted. The combustion temperature can be adjusted by the supply amount of the industrial waste A2 such as the waste plastic, the sludge B, and the input amount of the air. The combustion air is preferably blown from the side wall of the melting furnace 21 to promote the formation of the swirling flow 25.

The pyrolysis gas E is burned into exhaust gas F and discharged from the exhaust gas outlet 22. Furthermore, Z in incombustibles
n and Pb are oxidized to fly ash H and discharged together with the exhaust gas F. Copper slag and metal oxides in industrial waste are melted at a high temperature and contact with each other in the swirling flow 25 while turning into slag and become large, and fall down due to gravity or centrifugal force.
It hits one side wall and falls. The dropped slag G is collected at the slag collection port 23 and collected outside. Recovered slag G
Contains a large amount of Cu ₂ O. Thus, it is possible to recover the quality of high slag G of Cu ₂ O from the lower copper slag-quality of Cu ₂ O.

FIG. 5 shows the slag G recovered from the melting furnace 21.
3 is a flowchart for refining valuable metals in an electric holding furnace 31 to recover valuable metals. The slag G recovered from the melting furnace 21 is poured into the electric holding furnace 31, a graphite electrode is inserted from above to reach the slag bath, an electric current flows between the graphite electrodes, and the slag G is melted by resistance heat of the slag G. . In order to make the viscosity of the slag in the electric holding furnace 31 appropriate, a solvent is introduced in parallel with the reduction. Carbon C, a component of coke M, is Cu ₂
Since O is reduced to generate Cu and CO, coke M can be used as a reducing agent. Pulverized coal,
LPG, iron and the like can be mentioned, but coke M is preferable because coke M can be uniformly charged on the slag solution surface with a simple device such as a hopper.

The temperature of the slag in the electric holding furnace 31 is 12
A temperature range from 50 to 1400C is preferred. This is Cu
The melting point of ₂ O is 1230 ° C. and the melting point of copper is 1080 ° C.
Is required to be at least higher than the melting point of Cu ₂ O. On the other hand, when the temperature exceeds 1,400 ° C., damage to the refractory becomes severe. By performing scouring for 0.5 to 1.0 hour, black copper I having a copper grade of about 70 to 90% can be obtained. Further, since the waste slag J is composed of a homogeneous glassy component such as silica sand or alumina, it can be used as a cement material for a roadbed or the like. Other examples of the furnace for treating slag include a flash smelting furnace, a reverberatory furnace, and a blast furnace. However, the composition of the raw slag fluctuates,
Electric holding furnace 3 that can perform the same processing even if the raw materials fluctuate
1 is most preferred.

FIG. 6 shows a melting furnace 21 or an electric holding furnace 31.
Is a flowchart showing a method of recovering valuable metals for recovering zinc, lead and the like in the form of salt from fly ash H generated from ash.
The fly ash H generated together with the exhaust gas F from the melting furnace 21 or the like can be cooled and collected by cooling water, and the cooled exhaust gas F can be transferred to the bag filter 51 to collect the fly ash H. Also, fly ash H generated during refining in the electric holding furnace 31
Collect. Exhaust gas F from which dioxin which is a harmful substance is adsorbed and removed can then be used to collect fly ash H by a bag filter 51. Since fly ash H contains Zn and Pb, Zn and Pb are further recovered by wet processing. I do.

The fly ash H collected in each step is put into a slurry tank, then leached with an aqueous sulfuric acid solution, and lead is precipitated as sulfate. The precipitated lead sulfate is turned into mud using a thickener, and then 50 to 60% grade lead sulfate is collected as slag using a filter. Zinc is dissolved in the slurry tank, and slaked lime (Ca (OH) ₂ ) is added to neutralize it.
The zinc is precipitated as a hydroxide salt, and the
0% of zinc hydroxide is recovered as slag. These recovered lead sulfates and the like are purified by other scouring methods to obtain metallic Zn, Pb
It is easy for the industry. The wastewater sludge at this time can be fed into the fluidized bed gasifier 1 again. Alternatively, it can be used as a cement material.

Next, the waste liquid L is sprayed to the exhaust gas F from the melting furnace 21 in the waste liquid decomposition tower 26, and the cooling water is sprayed in the quenching tower 41 to cool the exhaust gas F and discharge the exhaust gas F to the atmosphere. It can be cooled until it can. This waste liquid decomposition tower 2
In step 6, a step of incinerating the waste liquid L can be included. The waste liquid generated in smelting contains metal ions and acids, and the waste liquid generated in general sewage contains inorganic substances and organic substances. These are desirably incinerated. By exposing the waste liquid L to high temperature, organic substances and the like and acids and the like are decomposed, and inorganic substances and metal ions and the like can be converted into oxides and collected by the bag filter 51. Further, the cooled exhaust gas F generated in the electric holding furnace 31 is burned in the secondary combustion furnace to decompose harmful substances, and is similarly cooled by the cooling water in the quenching tower 41. The quenching of the exhaust gas F is performed when the temperature is in the range of 250 to 500 ° C., because harmful substances such as dioxin are resynthesized. Therefore, the time in this temperature range is reduced to prevent the harmful substances from being generated again. It is. Activated carbon K is blown during the transfer of the quenched exhaust gas F to the bubble filter 51. The organic substance is adsorbed by blowing activated carbon K having an average particle size of 10 to 20 μm into the exhaust gas path together with air. Although the generation of dioxin and the like is suppressed by the high-temperature combustion in the melting furnace 21, it is difficult to always completely suppress the generation. Therefore, harmful substances can be removed by blowing activated carbon K during discharge of the exhaust gas F. In practice, the exhaust gas F discharged from the quenching tower 41 contains dioxin of 1 ng / m ³ or less, but the dioxin concentration can be reduced to 0.1 ng / m ³ or less by blowing activated carbon K.

Next, the reduction test with iron will be described. Slag 1 on alumina crucible with inner diameter 58mmφ and height 70mm
After adding 50 g and maintaining the temperature at 1,300 ° C. for 30 minutes, a reduction operation with metallic iron was performed. The reduction was carried out by the following four methods, and the progress of the reduction was examined by sampling the slag during the reduction and analyzing the copper. Reduction method (1) Hold the iron bar in a state of being immersed in the slag. (2) The iron bar is held in a state of being immersed in the slag, and 500 ml / min of air is blown from a porcelain tube. (3) The cut iron bar is held in a state of being immersed in the slag, and 500 ml / min of nitrogen is blown from a porcelain tube. (4) Hold the iron pipe in a state of being immersed in the slag, and blow 500 ml / min of air into the pipe. (5) Hold the cut iron bar in a state of being immersed in the slag, and mechanically stir the slag with an L-shaped stainless steel bar. FIG. 7 shows the result.

The following can be seen from FIG. (A) In any of the reduction methods, the reduction proceeds with time. (B) Agitation of slag by blowing air and nitrogen is effective in increasing the reduction rate ((2),
(3)). (C) Even if air is used for stirring, the copper produced by the reduction is not re-oxidized to slag ((2), (4)). (D) The slag can be stirred mechanically in addition to gas stirring ((5)).

[0030] Precious metals are included in industrial wastes containing metals, even in trace amounts. Gold that is nobler than copper in the process of slagged copper being precipitated as metallic copper by reduction,
Metals, such as silver, platinum, and palladium, behave together with copper. Therefore, the noble metal is concentrated in the recovered metal. Next, an experiment of reducing Cu ₂ O with iron will be described.

[0031]

【Example】

Example 1 A slag having a composition substantially equal to that of the slag 15 in Table 1 was obtained.
Reduction and stirring were performed by blowing 500 ml / min of air from the immersed iron pipe, and SiO _{2 was} added simultaneously and concurrently with the reduction. Table 3 shows the results.

[0033]

[Table 3]

The addition rate of the SiO ₂ is the ratio of the additive amount of SiO ₂ with respect to prereduced slag weight. The addition of SiO ₂ significantly improved the flow length of the slag after reduction.

Example 2 Table 4 shows that slag generated by treating industrial waste containing copper slag and metal in a gasification and melting furnace, and the slag was reduced by blowing air into an iron pipe to recover the metal. The behavior of gold at the time is shown.

[0036]

[Table 4]

[0037]

As described above, according to the present invention, valuable metals including shredder dust and gold in copper slag can be smoothly recovered as slag. Can be effectively used as a raw material for cement.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining an outline of a slag fluidity test method. is there.

FIG. 2 is a drawing for explaining one embodiment of the gasification melting method in the present invention.

FIG. 3 is a view showing a schematic structure of a fluidized-bed gasification furnace used in the gasification melting method.

FIG. 4 is a drawing showing a schematic structure of a melting furnace used in the gasification melting method.

FIG. 5 is a view showing a step of producing black copper from slag produced by the method of the present invention.

FIG. 6 is a diagram showing a process of recovering zinc and lead from fly ash generated in a melting furnace or an electric holding furnace.

FIG. 7 is a graph illustrating the results of a copper oxide reduction test with iron.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st storage 2 2nd storage 3 Supply conveyor 4 Supply feeder 11 Fluidized bed gasifier 12 Fluidized bed 13 Fluidized bed 21 Melting furnace 22 Exhaust gas discharge port 23 Slag recovery port 24 Auxiliary burner 25 Swirling flow 26 Waste liquid Decomposition tower 31 Electric holding furnace 41 Quenching tower 51 Bag filter 52 Activated carbon blowing device 61 Washing tower 71 Mist cotrel 81 Exhaust chimney

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C22B 9/10 101 F27B 17/00 A 11/02 B09B 3/00 ZAB F27B 17/00 302E 303A 303D (72 ) Inventor Kazuhiro Asai 1-1-2 Shiroganecho, Hitachi City, Ibaraki Prefecture Nippon Mining & Metals Co., Ltd.Technology Development Center (72) Inventor Shiro Kawai 2-10-1, Toranomon, Minato-ku, Tokyo Nippon Mining & Metals Co., Ltd. 72) Inventor Toshikazu Higashi 2-10-1, Toranomon, Minato-ku, Tokyo Within Nikko Techno Service Co., Ltd. (72) Inventor Takahiko Okura 2-1-1 Toranomon, Minato-ku, Tokyo Nikko Techno Service F Term (reference) 4D004 AA43 AA46 AB03 AB07 BA02 BA05 CA09 CA13 CA15 CA27 CA29 CA32 CA36 CA37 CB32 CB46 CC01 CC02 CC04 CC11 CC12 DA01 DA03 DA0 6 DA10 DA20 4K001 AA01 AA04 AA09 AA41 BA12 EA03 GB05 HA02 KA02 KA05 KA06

Claims (8)

[Claims] 1. A copper slag containing valuable metal and a product containing metal
Reducing slag generated by processing industrial waste
To recover at least copper as a valuable resource
To improve the flow of the slag while performing the reduction
CaO, SiO _TwoAnd a solvent containing at least one of Fe
A valuable resource recovery method characterized by supplying to slag. 2. A slag having a flow length of 18 after addition of a solvent.
The valuable resource recovery method according to claim 1, which is not less than cm. However,
5 cm wide V tilted in the length direction at a tilt angle of 7.5 °
The grooved stainless steel bar with the groove face up and 200 ~
Heat to 250 ° C and apply 150 cm from above
g of slag is allowed to flow down, and the flowability is measured by the length of the slag flowing down the groove surface. 3. The slag comprises 5 to 35% by weight of Cu ₂ O, 5 to 17% by weight of FeO, 1 to 15% by weight of ZnO, _{20 to} 45% by weight of SiO _{2, and} 25 to 45% of CaO.
The valuable resource recovery method according to claim 1 or 2, wherein the method substantially comprises Al ₂ O ₃ : 10 to 20% by weight. 4. The valuable resource recovery method according to claim 1, wherein the reducing agent is metallic iron, and FeO generated by oxidizing the metallic iron is used as a solvent. 5. The valuable resource recovery method according to claim 4, wherein the reducing agent is metallic iron, and the slag is stirred while passing air or a non-oxidizing gas through the iron pipe. 6. The valuable resource recovery method according to claim 4, wherein the reducing agent is lump iron, and the lump iron is charged while mechanically stirring the slag. 7. The valuable resource recovery method according to claim 1, wherein the slag is slag generated by treating the copper slag and industrial waste in a gasification and melting furnace. 8. The method according to claim 1, wherein at least one selected from the group consisting of gold, silver, platinum, and palladium further contained in the valuable material is recovered. Valuables collection method.