WO1993002219A1 - Procede pour la purification du minerai de cuivre ou de son alliage - Google Patents
Procede pour la purification du minerai de cuivre ou de son alliage Download PDFInfo
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- WO1993002219A1 WO1993002219A1 PCT/JP1992/000358 JP9200358W WO9302219A1 WO 1993002219 A1 WO1993002219 A1 WO 1993002219A1 JP 9200358 W JP9200358 W JP 9200358W WO 9302219 A1 WO9302219 A1 WO 9302219A1
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- molten metal
- copper
- slag
- oxide
- raw material
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B15/00—Obtaining copper
- C22B15/0026—Pyrometallurgy
- C22B15/0028—Smelting or converting
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B15/00—Obtaining copper
- C22B15/0026—Pyrometallurgy
- C22B15/0028—Smelting or converting
- C22B15/0052—Reduction smelting or converting
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B15/00—Obtaining copper
- C22B15/0026—Pyrometallurgy
- C22B15/006—Pyrometallurgy working up of molten copper, e.g. refining
Definitions
- the present invention relates to a method for purifying copper or a copper alloy from a copper raw material containing copper or a copper alloy, and more particularly, to Pb, Ni, Sb, S, Bi, As, or Fe, Sn, Z.
- the present invention relates to a method for purifying a copper or copper alloy raw material containing an impurity element such as n by efficiently removing the impurity element.
- copper has excellent thermal and electrical conductivity, and is widely and widely used in heat exchangers, electricity, materials for compress parts, materials, and the like. Copper is less expensive than iron, etc., and is expensive. Therefore, from the viewpoint of effective use of resources, used copper or copper alloy scrap or copper or copper alloy scrap generated after processing (hereinafter referred to as the Is sometimes simply referred to as copper scraps) and collected for reuse.
- copper scrap contains a large amount of impurity components such as dissimilar metal materials, metal, solder, plating, and insulators, and as such, is unsuitable for components and its use is severely restricted.
- the copper chips are manually sorted before dissolving, and the impurities are removed by performing magnetic separation and the like.
- this method is dependent on humans, there are limitations on the sorting ability, throughput, etc.
- the elements for example, t ⁇ ⁇ i, Sb, S-7-i3i, ⁇ ⁇ or e, 'n, Zn, etc.
- the method which is considered to be relatively effective is the method disclosed in Japanese Patent Application Laid-Open No. 61-217538.
- this method a small amount of phosphorus is added to the copper scrap after melting, and the impurity is floated and separated by oxidation treatment together with a part of the phosphorous oxide, and then the molten metal is kept in a highly oxidized state. After removing residual phosphorus by oxidation, it is subjected to a reduction treatment to remove oxygen.
- Fe, Sn, Zn, etc. can be removed relatively efficiently, but Pb, Ni, Sb, S, Bi, or As is difficult to remove.
- there is a problem that a considerable amount of P is mixed in the purified copper.
- the present invention has been made in view of the above circumstances, and its purpose is to dissolve and refine a raw material containing copper or copper alloy scraps or a copper raw material called a blister before purification. To efficiently separate and remove Pb, N ⁇ , Sb, S, Bi, As or Sn, Fe, Zn contained in the copper raw material and recover it as high-quality copper. To provide a possible purification method Things. B month
- the configuration of the refining method according to the present invention is used for refining a copper or copper alloy raw material containing at least one of Pb, Ni, Sb, S, Bi, and As.
- Step 1 Step of melting copper or copper alloy raw material
- Step 2 While increasing the oxygen concentration in the molten metal,
- At least i selected from the group consisting of Fe, Fe oxide, Mn, and Mn oxide is added, and Pb, Ni, Sb, S, Bi, and As in the molten metal are converted to Fs. e and / or slag as a composite oxide of Mn,
- Step 3 a step of removing generated slag
- Step 4 a step of subjecting the moisture to a source treatment
- copper or copper alloy contains at least one of Pb, Ni, Sb, S, Bi, As and at least one of Sn, Fe, and Zn,
- Step 1 Step of melting copper or copper alloy raw material
- Step 2a A step of oxidizing Sn, Fe, and Zn in the molten metal by increasing the oxygen concentration in the molten metal to form a slag.
- Step 2b Fe, Fe oxidation of the molten metal. At least one selected from the group consisting of oxides, Mn and Mri oxides, and Pb, Ni, Sb, S, Bi, and As in the molten metal are Fe. And slag as a composite oxide of Mn and Mn,
- Step 3 a step of removing generated slag
- Step 4 Step of reducing the molten metal
- step 2a by adjusting the oxygen concentration in the molten metal to be not less than 500 ⁇ , the Sn, Fe, and ⁇ can be more efficiently slagged and separated by flotation.
- step 2 or 2b at least one of Fe, Fe oxide, Mn, and Mn oxide (more preferably, Fe and / or Fe oxide) is added to the weight of the molten metal. 10 to 50,000 ppm, and as a method of addition, a method of spraying on the surface of the molten metal is adopted, and the molten metal is stirred by inert gas publishing or the like, and the resulting composite oxide is turned into slag on the surface of the molten metal. By floating, Pb, Ni, Sb, S, Bi, and As in the molten metal can be more efficiently removed.
- Si0 2 - sediment thereto by adding A 0 3 based flux It is better to remove it after attaching it.
- Si0 used 2 - A1 2 0 3 based fluxes are, when the Si0 2 and A1 2 0 3 100 parts by weight of the total amount of, Si0 2: 70 to 90 parts by weight of A1 2 0 3: 30 ⁇
- the amount is preferably in the range of 10 parts by weight, and the amount of addition is preferably in the range of 0.005 to 0.10% based on the total weight of the molten metal.
- the addition of the solid or gaseous reducing agent (preferably, the solid reducing agent) and the blowing of the inert gas are performed in parallel.
- FIG. 1 is a graph showing the relationship between the oxygen concentration of the molten metal after the oxidation treatment in step 2a and the impurity metal element concentration in the molten metal.
- FIG. 2 is a graph showing, in comparison, the Sn concentration in the molten metal when the oxidation treatment in step 2a was performed in an induction melting furnace and a reflection furnace.
- FIG. 3 is a graph showing the relationship between the oxygen concentration in the melt and the Pb concentration of the melt in step 2a.
- FIG. 4 is a graph showing the Ni concentration in the molten metal in which only the oxidation treatment in step 2a was performed, and in the case where the composite oxide formation processing in step 2 or 2b was performed thereafter. is there.
- FIG. 5 is a graph showing the relationship between the amount of Fe added and the Ni concentration in the molten metal in step 2 or 2b.
- FIG. 6 is a graph showing the relationship between the oxygen concentration in the melt and the Ni fishing rate in the melt in step 2 or 2b.
- FIG. 7 is a graph showing the effect of the Fe oxide addition form on the effect of removing Ni from the molten metal when performing step 2 or 2b.
- FIG. 8 is a graph showing the relationship between the Fe concentration in the molten metal and the method of adding the Fe oxide in Step 2 or 2b.
- FIG. 9 is a graph showing the relationship between the presence or absence of Ar blowing in step 2 or 2b and the effect of removing the impurity metal element.
- FIG. 10 is a graph showing the relationship between the effect of removing impurity metal elements and the amount of Fe oxide sprayed in step 2 or 2b.
- FIG. 11 shows that the addition form of Fe in step 2 or 2b 4 is a graph showing shadow hairs affecting the removal effect of P b and Ni.
- FIG. 12 is a graph showing a change in the concentration of the impurity metal element in the molten metal due to the retention after the complex oxide forming treatment in step 2 or 2b.
- FIG. 13 is a graph showing the relationship between the number of repetitions and the amount of impurity elements in the molten metal when the composite oxide forming treatment of step 2 or 2b is repeated a plurality of times.
- FIG. 14 is a graph showing the relationship between the temperature of the molten metal and the concentration of impurity elements in the molten metal at the time of removing the slag in step 3.
- the first FIG. 5 is a C u 2 0 and S i 0 2 state diagram.
- the first 6 figure, C u O (and C u0 2) and A 1 - is a state diagram of 0 3.
- FIG. 17 is a graph showing the relationship between the reduction treatment time in step 4 and the gas concentration on the surface of the molten metal.
- FIG. 18 is a graph showing the relationship between the reduction treatment time in step 4 and the gas concentration on the surface of the molten metal.
- FIG. 19 is a schematic diagram showing the state of the molten metal interface before the reduction treatment in step 4.
- FIG. 20 is a schematic diagram showing the state of the molten metal interface at the time of the source processing in step 4.
- FIG. 21 is a graph showing the relationship between the injection or time of Ar gas injection during the reduction treatment in step 4 and the oxygen concentration in the molten metal.
- Fig. 22 is a graph showing the relationship between the Ar gas injection or blowing time and oxygen concentration in the molten metal during the reduction treatment in step 4. It is rough.
- FIG. 23 is a graph showing the relationship between the reduction treatment time in step 4 and the amount of oxygen in the molten metal.
- FIG. 24 is a graph showing the relationship between the reduction treatment time in step 4 and the amount of oxygen in the molten metal.
- Sn, Fe, and Zn can be easily obtained by supplying a gaseous oxygen source (oxygen gas, air, etc.) or a solid oxygen source (eg, CuO, etc.) to the dissolved raw material. Since it is oxidized and floats on the surface of the molten metal as oxide, it can be easily removed.
- a gaseous oxygen source oxygen gas, air, etc.
- a solid oxygen source eg, CuO, etc.
- the method comprises one selected from the group consisting of Fe, Fe oxide, Mn, and M n oxide.
- Fe (Mn) -based flux Using flux (hereinafter sometimes referred to as Fe (Mn) -based flux), Pb, Ni, Sb, S, Bi, and As are removed as a composite oxide of Fe and / or Mn. The step of removing is added.
- step 1 oxygen is removed by reducing the molten metal to obtain copper from which impurity elements have been removed. And the processing of them, Fe, When Sn and Zn are not contained, the above steps 1, 2, 3, and 4 are carried out in this order, while Pb, Ni, Sb, S, Bi, As When Fe, Sn, and Zn are included together with at least one of the above, the steps are performed in the order of step 1, step 2a, step 2b, step 3, and step 4.
- This step is a step of dissolving the copper raw material as the first step of the purification method according to the present invention.
- Copper raw materials include copper incineration wire scraps produced by incinerating the resin coating on the surface of compress wires, Ni-plated copper wire scraps, fin materials, plate materials, pipe materials, etc. obtained from waste materials such as mature exchangers.
- Various copper scraps such as J1 or blisters generated by cutting of products or blisters are used, and these may be mixed with remaining hot water of refined copper or remaining hot water that may be generated in the manufacturing process. It can also be used.
- As the melting furnace a known furnace such as a reflection furnace or an induction melting furnace may be used.
- This step is used when the raw material contains one or more of Fe, Sn, and Zn, and supplies a solid, Z, or gaseous oxygen source to the molten metal.
- the oxygen concentration is increased, and the Sn, Fe, and Zn contained in the molten metal are turned into slag as oxides. That is, Sn, Fe, and Zn in the molten metal can be relatively easily removed because they are easily oxidized by the oxidation treatment of the molten metal to form slag and float on the surface of the molten metal. .
- Oxygen or air (generally, air) is used as a source of oxygen in the form of oxygen, and a gaseous oxidant such as air is more preferable as the oxidant.
- a gaseous oxidant such as air is more preferable as the oxidant.
- most of Zn tends to be oxidized after evaporating to the surface of the molten metal. It is desirable to use.
- the solid oxygen source may be sprayed on the surface of the melt or blown into the melt together with the carrier gas, but the most efficient method is to blow into the melt.
- the gaseous oxygen source is supplied by a method of blowing upward toward the surface of the molten metal or a method of blowing the molten oxygen into the molten metal, and a more preferable method is a method of blowing into the molten metal.
- This oxidation step may be performed using only one of the solid oxygen source and the gaseous oxygen source, or both may be used together.
- the solid oxygen source may be applied to the surface of the molten metal.
- a method of spraying and blowing a gaseous oxygen source into the molten metal, a method of blowing a solid oxygen source together with the gaseous oxygen source into the molten metal, and the like can be employed.
- the supply amount of the solid oxygen source or gaseous oxygen source should be adjusted so that the oxygen concentration in the molten metal is 500 ppm or more. It is desirable to control.
- Fig. 1 shows a high-frequency induction melting furnace with a capacity of 3 tons, and a copper raw material (Cu-1 wt% Fe-1 wt% Sn-1 wt% Zn-1 wt% Pb).
- a copper raw material Cu-1 wt% Fe-1 wt% Sn-1 wt% Zn-1 wt% Pb.
- Fe and Zn can be sufficiently reduced by setting it to 500 ⁇ or more.
- Fig. 3 shows the result of examining the relationship between the oxygen concentration and the Pb concentration in the molten metal by the oxidation treatment in the same experiment as above, and the Pb in the molten metal was removed by simple oxidation treatment alone. Unfortunately, a large amount of oxygen must be supplied. This tendency was the same for Ni, and it was confirmed that Ni was more difficult to remove by oxidation than Pb.
- This oxidation step is performed to remove Fe, Sn, and Zn contained in the raw materials. ⁇ If you use raw materials that do not contain elements, you do not need to perform this step.
- the slag generated in this step may be removed once before moving to the next step, or the next step may be carried out while leaving it on the surface of the molten metal, and may be removed at once in step 3. .
- At least one selected from the group consisting of Fe, Fe oxide, Mn, and Mn oxide is added to the molten metal, and Pb, Ni, Sb, S, Bi in the molten metal are added. , As are removed.
- Pb, Ni, Sb, S, Bi, As in the molten metal are oxidized as compared with Fe, Sn, Zn. Difficult, cannot be successfully removed by simply oxidizing the molten metal.
- one or more of Fe, Fe oxide, Mn, and Mn oxide are added to the molten metal, and Pb, Ni, Sb, S, Bi, As are expressed as Fe and / or Mn. It was confirmed that when the composite oxide was used, the composite oxide floated on the surface of the molten metal as slag and could be easily removed.
- Fig. 4 shows the results when the lump copper melt containing lOOOOppra Ni was used.
- Fig. 5 shows the result of examining the relationship between the amount of Fe added to remove Ni and the Ni concentration in the molten copper raw material (however, the treatment temperature was set to 1200 and the oxygen concentration was set to 100000ppffl). It can be seen that, in order to efficiently remove Ni from the molten metal, it is necessary to add Fe at least twice the amount of Ni in the molten metal.
- FIG. 6 is Ru der shows the results of examining the oxygen concentration of the copper material in the molten metal and (0 2 ZN i ratio) the relationship between N i concentration in the melt.
- the molten metal temperature was 1200
- the amount of Fe added was 4 times the Ni concentration in the molten metal
- the oxygen concentration was adjusted by the amount of air blown.
- Ni in the molten metal can be efficiently removed if the oxygen concentration in the molten metal is set to at least twice the Ni concentration.
- Ni (or Pb) is a complex oxide with Fe (or Mn) [Ni (or Pb) adheres to the Fe (or Mn) oxide. , Including the melted state].
- the method 3 is the most preferable in increasing the removal efficiency of Ni (or Pb, Sb, S, Bi, As), and the method 2 is the next.
- the method (1) does not provide a sufficient Ni (or Pb, Sb, S, Bi, As) removal effect
- the method (2) also has a considerably superior Ni (or Pb, Sb).
- b, S, B i, A s) The removal effect can be obtained.
- the most preferable method is the method (1). The following experiments were conducted to confirm these trends. Show data.
- Results First Figure 7 is the N i initial concentration use the copper raw material melt is Iotaomikuron'omikuronroroita, the case where the treatment temperature was set to 1200'C, examined the relationship between the addition form of Fe 2 0 3 and N i removal efficiency It is shown. As is evident from this figure, the most effective method is to use both Fe 2 O 3 spray and Fe 2 O 3 Ar injection in order to increase the Ni removal efficiency. induction ⁇ of Fe 2 0 3 scatter and molten metal properly is simultaneously blown method, the most bad is Fe 2 0 s and a r to use a a r public ring.
- the Figure 8 is shows the results of examining the ⁇ of F e 3 ⁇ 4 of the Fe 2 0 3 amount in the melt for the case where various changed Fe 2 0 3 addition form, from FIG. obvious that as the Fe 2 0 3 the blown method is adopted to increase the F e concentration of the melt is markedly into the molten metal, it can be seen that rather inhibits purification effect. In contrast the case where a method of spraying a Fe a (to the melt surface, F e concentration in the melt even when increasing the Fe 2 0 3 added pressure amount does not go N ⁇ .
- Figure 9 is use the copper alloy melt containing respectively iOOppm a P b and N i, at a treatment temperature of 1200 * C, spraying of Fe 2 0 3 only, there have the Fe 2 0 3 scatter and A r public
- This figure shows the results of examining the relationship between the processing time and the concentrations of Ni and Pb in the molten metal in the case of using the alloying together.
- the effect of the melt agitation by A r blowing was not observed almost, N i and P b in the molten metal can be sufficiently removed by simply spraying the Fe 2 0 3 You can see that.
- F e relative solution water 2000ppm
- Fe 2 O a 2 wt%
- Fe 3 0 4 The result of examining the effect of removing Ni and Pb when 2% by weight was sprayed on a hot water surface and left for 3 minutes was shown.
- the F e oxide as is also clear from this figure is the most effective Fe 2 0 a, Fe a 0 4 and F e even considerable N i (or P b) to obtain the removal effect I can do it.
- the molten metal after treatment may be static depending on the particle size of the generated oxide or composite oxide. Floating fine granular products by placing and calming Is considered to be effective. Therefore, a molten copper raw material containing lOOppra each of Fe, Sn, Zn, Ni, and Pb was used.
- step 2a the oxygen concentration was increased to lOOOOppm by air publishing to produce Without removing the oxides that form, as step 2b, Fe 2 O 3 was sprayed at 2% by weight based on the weight of the molten metal, and the impurity metal concentration immediately after induction stirring for 15 minutes, and then Induction The search was stopped and the melt was calmed down. After 1 hour, the impurity element concentration was examined. The results shown in Fig. 12 were obtained.
- Step 2a and Step 2b are performed successively, the oxides of F e, Sn, and Zn generated in the oxidation step of Step 2a are fine, Even during the treatment in step 3, a part of the oxide is dispersed in the molten metal, but by calming the molten metal, these fine oxides float on the surface of the molten metal, and the F The contents of e, Sn and Zn are considerably reduced.
- the portability of Pb and Ni hardly changed before and after quenching, and therefore composite oxides such as Pb and Ni would be floated and separated on the molten metal surface immediately. Seem.
- the preferred addition amount of Fe, Mn and their oxides added in step 2b based on the weight of the molten metal is in the range of 10 to 50.000 PPM per step. That is, this step 2b may be performed only once when the amount of the impurity metal element to be removed is relatively small, but it is often performed a plurality of times when the amount of the impurity metal element to be removed is large. In this case, it is desirable that the amounts of Fe, Mn, and their oxides added in each step be within the above ranges.
- Fig. 1.3 shows how Ni and Pb are reduced when the process 2b is repeated several times, using a copper melt containing lOppm each as Ni and Pb. It can be seen that as the number of repetitions increases, the amount of impurity elements decreases.
- the treatment temperature is set to, for example, about 1200 to 1230 * C, preferably about 1100 to 1200 so that the slag generated in step 2 or 2b becomes a sticky solid or semi-molten state.
- the control is preferable because oxides and composite oxides floating on the surface of the molten metal are well captured by the slag.
- step 2 the slag floating on the surface of the molten metal after the completion of step 2 or 2b is removed. It is advisable to remove the slag according to the usual method, but it is preferable to add the following measures at the time of the slag removal, because the workability is improved and the Cu loss can be suppressed to increase the Cu yield. .
- the slag floating on the surface of the molten metal at the end of the step 2 or 2b contains a large amount of impurities generated in the oxidation step together with the oxides of the impurity elements and the composite oxides with Fe and Mn as described above.
- Copper oxide (especially Cu 20 ) is contained.
- copper oxide is used as a matrix component and floats on the surface of the molten metal in a state where the oxides of the above-mentioned impurity elements and composite oxides are dispersed. are doing. Therefore, if this slag is removed from the molten metal surface without any contrivance, an equivalent amount of copper oxide is taken out together with the impurity metal component, and the Cu loss may increase so that Cu loss cannot be neglected.
- the temperature of the molten metal is raised to a temperature higher than the temperature at which the copper oxide dissolves in the molten metal.
- This is a method of removing some of the slag after returning to the molten metal, and the preferred temperature at this time is in the range of 1225 to 00.
- step 14 shows that after the copper alloy containing lOOppm each of Fe, Sn, Ni, and Pb was dissolved in the atmosphere, the oxygen concentration was increased to 10,000 ppm by blowing air in step 2a, and in subjected to induction ⁇ the Fe 2 0 3 double against molten metal weight was sprayed on soluble water surface, then in the case of performing the skimming after raising the melt temperature to 1200-1400, skimming
- the relationship between the temperature of the previous molten metal and the weight of the removed slag weight ratio when the weight of the removed slag is 100 when the temperature of the molten metal is 1200
- the impurity element concentration of the obtained molten metal are examined. It is shown.
- the amount of the removed slag can be reduced to about 1/10, and the copper discharged together with the impurity metal oxide can be reduced. It can be seen that the amount of oxide can be significantly reduced. Moreover the heating temperature 1400 e C or less, do it suppressed Ri certainty below 1370'C good, impure elements there is no possibility to return to the melt Te cowpea to raise the temperature.
- the temperature of the molten metal at the time of removing slag should be set in the range of 1230-1370 . Then as a good or correct means for increasing the efficiency of removal of slag, Si0 2 on the surface of the molten metal - adding A1 2 0 3 based flux, the slag is above floating on the molten metal surface were allowed to adhere to the flux There is a method of removing.
- This method facilitates the removal of slag by attaching the slag to a flux that has poor wettability with respect to the molten copper and has good wettability with respect to the slag floating on the surface of the molten metal.
- action of SiO a and [alpha] 1 2 0 3 in said Si0 2 ⁇ ⁇ 1 8 ⁇ 3 based flux can and described child as follows.
- the copper melt has the effect of wettability adsorbs good slag and slag of poor yet melt surface wettability, reaction of Cu 2 0 and Si0 2 which is a main component of slag of the following It is on the street. That first 5 Figure Cu 2 0 - indicates Si0 2 system equilibrium diagram, the melting point of Cu 2 0 is Ru 1230 der. Therefore, at a normal temperature of 1100 to 1200 at which the copper raw material is melted, Cu 20 exists in a semi-molten state.
- Si0 2 has a melting point of about 1700, the Te dissolution temperature odor copper are present in a solid state, because the eutectic point is present in the Si0 2 8% in Cu 2 0- Si0 2 system, Si0 As 2 increases by more than 8%,
- the Cu 2 0 * A1 2 0 3 Cu 2 0 and A1 2 0 3 are more stable compound at a temperature in the vicinity of 1200 Generate.
- the Cu 2 0'Al 2 0 s may be easily broken, and also has a work is A1 2 0 3 for adsorbing slag because they exist in solid and A1 3 0, copper Since the separability from the molten metal is also good, the workability and efficiency of removing the slag can be significantly improved.
- the viscosity of the slag on the surface of the molten metal is low.
- the amount of the flux is preferably in the range of 0.005 to 0.10% based on the weight of the molten metal, based on the experimental results shown in Table 2 below.
- the hula Tsu box is pure Si0 2 and A1 2 0 3 other but were mixed at a predetermined ratio, and out naturally occurring as a Si0 2 source and A1 2 0 3 source
- CaAl 2 SiO e (Anorthite) ⁇ NaAlSiaOe (Albite), KAl 2 (Si 3 Al) 0, o (OH. F) 2 (Muscorite) , or the like can be a child to be used as the raw material.
- Raw material Electric copper ingot 80% Commercial copper scrap 20%
- Step 4 (reduction step):
- the oxygen taken in the molten metal in the step 2, 2a or 2b of removing the impurity metal element is removed. That is, in Steps 2, 2a and 2b, a considerable amount of oxygen (or air) is blown or an oxide is added to oxidize and remove the impurity element components.
- the molten metal contains a large amount of oxygen (usually over 100 ppm).
- a reduction process to reduce the oxygen concentration to less than about 200 ppm is essential to meet the copper alloy specifications.
- This reduction can, of course, be performed according to a conventional method, but the oxygen concentration of the molten copper after steps 1 to 3 is extremely high as described above. Therefore, in order to reduce the oxygen concentration of the molten copper to the target level in a short time, it is desired to employ the following reduction method. That is, as a preferable reduction method to be carried out as the step 4, a reducing agent is added to the surface of the copper melt, and at the same time, an inert gas is blown into the melt and an inert gas is blown into Z or the melt surface. A reduction is made by attaching a tag.
- C 0 gas such as 2 and CO generated, some of which are part while being dispersed release upwardly dissolves into the melt. And it crowded only soluble to the melt of oxygen present in these C 0 2 and CO gas and molten metal is thus trapped in the partial pressure difference into the inert gas bubbles blown into the molten metal, the molten metal with an inert gas Dissipated outside. At this time, if the inert gas is also sprayed onto the surface of the molten metal, oxygen floating on the surface of the molten metal is quickly dissipated into the upper space without dissolving into the molten metal again. That is, reduction can be performed more efficiently.
- C 0 gas such as 2 and CO generated
- a solid reducing agent such as charcoal and a gaseous reducing agent such as hydrogen and C 0 can be used, and a powdery solid reducing agent such as charcoal is more preferable.
- Oxygen present as oxide is Cu 2 0 + C—2 Cu + C0 T
- Oxygen dissolved in the molten metal as a gas is as follows: 0 2 + 2C-2C0 Cu Cu 20 and 02 in the molten metal are reduced by C of charcoal and released as CO gas.
- the reduction reaction is expected to proceed mainly by the following reaction. That is, when a reducing agent such as charcoal is sprayed on the surface of the molten metal,
- FIG. 17 shows the change in gas intensity just above the surface of the molten metal by gas chromatography, and when charcoal (C) was added to the surface of the molten metal, O 2 gas and CO 2 gas were rapidly generated. The amount of these gases generated hardly changes over time. On the other hand, almost no CO gas was generated immediately after the addition of charcoal (C), and the amount generated did not change over time.
- Fig. 18 shows the change in gas concentration in the molten metal by the partial pressure equilibrium method.
- 02 gas and CO 2 gas were rapidly generated immediately after the charcoal (C) was added, and even when the time had elapsed, these gases There is almost no change in the concentration of.
- C0 gas is hardly generated even after charcoal is added, and the amount generated does not change much with the lapse of time.
- the first 9 figure is a conceptual diagram showing a situation in the vicinity of soluble water surface prior to spray charcoal (C) on the surface of the melt, the melt surface are present 0 2 gas and N 2 gas, the molten metal Contains a large amount of oxides such as Cu 20 .
- Fig. 20 is a conceptual diagram showing the situation immediately after the charcoal (C) was sprayed and covered on the surface of the molten metal.
- 0 2 gas and C 0 2 gas ⁇ is high, also the amount of dissolved 0 2 gas and C 0 2 gas in the molten metal of the molten metal table surface vicinity also has a multi-in. It is considered that the amount of oxides such as Cu 20 in the molten metal was reduced.
- step 4 of the present invention the oxygen concentration in the molten metal is reduced in a short time by adding a reducing agent and blowing an inert gas into the molten metal and / or by spraying the molten gas onto the surface of the molten metal.
- a reducing agent blowing an inert gas into the molten metal and / or by spraying the molten gas onto the surface of the molten metal.
- the copper melt was reduced under the following conditions, and the results shown in Fig. 23 were obtained.
- Fig. 24 shows the results of a similar study of the relationship between the amount of oxygen in the molten copper and the treatment time.
- the amount of oxygen which was It was found that it decreased to about 250 ppm after one minute, and to almost zero after 40 minutes.
- Oxidizing means air blowing
- Oxygen concentration in molten metal after treatment 400 ⁇
- Step 2 b composite oxide treatment
- Raw material used Commercial copper scrap 100% blended (JIS No.2 copper wire scrap level)
- Oxidizing means air spray
- Oxygen concentration in molten metal after treatment 4000 ppm Process 2b (composite oxide treatment)
- Ar gas is used for 10 J ⁇ Z using 20 mm0 (3 pieces) X
- Impurity metal elements Fe, Sn, Zn, Pb.Ni: 20 ppm or less Oxygen concentration: 1 90 ppra
- Raw material used Commercial copper scrap 100% compounded (JIS No. 2 copper wire scrap level)
- Oxidizing means air spray
- Impurity metal elements Fe, Sn, Zn, Pb, Ni: 20 ppm or less
- Oxygen port 190 ppm
- Raw material used Commercial copper scrap 100% blended (JIS No.2 copper wire scrap
- Process 1 (dissolution) Melting furnace: 5 ton heavy oil fired reverberatory furnace
- Oxygen concentration in molten metal after treatment 400 O ppm
- Step 2 b composite oxide treatment
- Impurity metal elements Fe, Sn, Zn, Pb, Ni: 2 O ppm or less Oxygen concentration: 200 ppm
- Raw material used Commercial copper scrap 100% blended (JIS No. 2 copper wire scrap level)
- Oxidizing means air blowing
- Oxygen concentration in molten metal after treatment 400 ppm
- Step 2 b composite oxide treatment
- Impurity metal elements Fe, Sn, Zn, Pb, Ni: each less than 20 ppra Oxygen concentration: 200 ppm
- Raw material used Commercial copper scrap 100% compounded (JIS No. 2 copper wire scrap level)
- Oxidizing means air blowing
- Impurity metal elements Fe, Sn, Zn, Pb, Ni: 20 ppm or less Oxygen concentration: 200 ppffl
- Raw material used Commercial copper scrap 100% blended (JS No.2 copper wire scrap level)
- Process 1 (dissolution) Melting furnace: 5-ton heavy oil fired reverberatory furnace
- Oxidizing means Oxygen spray
- Oxygen concentration in molten metal after treatment 400 Oppm
- Step 2 b composite oxide treatment
- Impurity metal elements Fe, Sn, Zn, Pb, Ni: 20 ppm or less for each oxygen content: 180 ppm
- Raw material used Commercial copper scrap 100% compounded (JIS No. 2 copper wire scrap level)
- Oxygen concentration during melting after treatment 400 Oppm
- Step 2 b composite oxide treatment
- Impurity metal elements Fe, Sn, Zn, Pb, Ni: 20 ⁇ or less Oxygen concentration: 180 ppm
- Raw material used Commercial copper scrap 100% compounded (JIS No. 2 copper wire scrap level)
- Oxidizing means oxygen injection and spraying Oxygen concentration in molten metal after treatment: 800 ppra
- Step 2 b composite oxide treatment
- Charcoal was added to the surface of the molten metal at 1% by weight based on the weight of the molten metal, and then Ar gas was applied at 8 £ / min using two bolus plugs (MP-70) 20 mm (2 pieces) made of Isolite. Inject 0 minutes.
- Impure metal elements Fe, Sn, Zn, Pb, Ni: 20 ppra or less
- Raw material used Commercial copper scrap 100% compounded (JIS No. 2 copper wire scrap level)
- Process 1 (dissolution) Melting furnace: 3-ton high-frequency grooved induction melting furnace
- Oxidation means: Oxygen spray and Cu0 addition
- Oxygen concentration in molten metal after treatment 800 Oppm
- Step 2 b composite oxide treatment
- Impurity metal elements Fe, Sn, Zn, Pb, Ni: each less than 20 ppra Oxygen concentration: 190 ppm
- Raw material used Commercial copper scrap 100% blended (JIS No. 2 copper wire scrap level)
- Oxidizing means Inject Cu 0 with air 'Oxygen concentration in molten metal after treatment: 8000 ppra
- Step 2 b composite oxide treatment
- Impurity metal elements Fe, Sn, Zn, Pb, Ni
- Oxygen concentration 200 ⁇
- Raw material used Commercial copper scrap 100% blended (JIS No.2 copper wire scrap level)
- Oxidizing means oxygen injection
- Oxygen concentration in molten metal after treatment 800 ppm
- Step 2 b composite oxide treatment
- Impurity metal elements Fe, Sn, Zn, Pb, Ni: 20 ppm or less Oxygen concentration: 200 ppm
- Raw material used Commercial copper scrap 100% compounded (JIS No. 2 copper wire scrap level)
- Process 1 (dissolution) Melting furnace: 3 ton high-frequency grooved induction melting furnace
- Oxidizing means oxygen injection
- Oxygen concentration in molten metal after treatment 800 Oppm
- Step 2 b composite oxide treatment
- Impurity metal elements Fe, Sn, Zn, Pb, Ni: less than 20 ppm each Oxygen concentration: 200 ppm
- Raw material used Commercial copper scrap 100% blended (JIS No.2 copper wire scrap level)
- Oxidizing means oxygen injection
- Oxygen concentration in molten metal after treatment 800 Oppm
- Step 2 b composite oxide treatment
- Impurity metal elements Fe, Sn, Zn, Pb, Ni: 20 ppra or less Oxygen vacancy: 200 ppm
- Raw material used Commercial copper scrap 100% compounded (JIS No. 2 copper wire scrap level)
- Oxidizing means oxygen injection and spraying
- Oxygen concentration in molten metal after treatment 800 Oppm
- Step 2 b composite oxide treatment
- Impurity metal elements Fe, Sn, Zn, Pb, Ni: 20 ppni or less Each oxygen content: 190 ppm
- Raw material used Commercial copper scrap 100% compounded (JIS No. 2 copper wire scrap level)
- Oxygen concentration in molten metal after treatment 800 Oppra Process 2b (composite oxide treatment)
- Impurity metal elements Fe, Sn, Zn, Pb, Ni: 20 ppm or less Oxygen concentration: 190 ppm
- Example 1 3 In step 2 b in L 6, except for using F e O, F e 3 C , a Mn O or Mn 0 2 in place of the F e 2 0 3 is in the same manner The results were similar was gotten. Uffl nature of production
- the present invention is configured as described above.
- Pb, Ni, Sb, S, Bi, and A contained in copper or copper alloy chips are removed.
- s or F ; e, Sn, and Zn can be efficiently removed and the final reduction treatment can be performed, and copper or copper alloy scrap can be used industrially effectively as a recycled material. .
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE69229387T DE69229387T2 (de) | 1991-07-15 | 1992-03-25 | Verfahren zum reinigen von kupferrohmaterial für kupfer oder seine legierungen |
US07/988,960 US5364449A (en) | 1991-07-15 | 1992-03-25 | Process for refining crude material for copper or copper alloy |
EP92907624A EP0548363B1 (en) | 1991-07-15 | 1992-03-25 | Process for refining raw material for copper or its alloys |
CA002091677A CA2091677C (en) | 1991-07-15 | 1992-03-25 | Process for refining crude material for copper or copper alloy |
FI931112A FI104268B (fi) | 1991-07-15 | 1993-03-12 | Menetelmä kuparin tai kuparilejeeringin raakamateriaalin puhdistamiseksi |
Applications Claiming Priority (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP19998591A JP2636985B2 (ja) | 1991-07-15 | 1991-07-15 | 銅または銅合金溶湯の還元法 |
JP3/199985 | 1991-07-15 | ||
JP3/308536 | 1991-10-28 | ||
JP3/308534 | 1991-10-28 | ||
JP30853491A JP2561986B2 (ja) | 1991-10-28 | 1991-10-28 | NiめっきCu−Fe系合金屑の溶解方法 |
JP3/308535 | 1991-10-28 | ||
JP30853591A JP2561987B2 (ja) | 1991-10-28 | 1991-10-28 | 銅屑の溶解方法 |
JP30853691A JP2515071B2 (ja) | 1991-10-28 | 1991-10-28 | 銅の溶解法 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1993002219A1 true WO1993002219A1 (fr) | 1993-02-04 |
Family
ID=27475989
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1992/000358 WO1993002219A1 (fr) | 1991-07-15 | 1992-03-25 | Procede pour la purification du minerai de cuivre ou de son alliage |
Country Status (6)
Country | Link |
---|---|
US (1) | US5364449A (ja) |
EP (1) | EP0548363B1 (ja) |
CA (1) | CA2091677C (ja) |
DE (1) | DE69229387T2 (ja) |
FI (1) | FI104268B (ja) |
WO (1) | WO1993002219A1 (ja) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5714117A (en) * | 1996-01-31 | 1998-02-03 | Iowa State University Research Foundation, Inc. | Air melting of Cu-Cr alloys |
JP3040768B1 (ja) * | 1999-03-01 | 2000-05-15 | 株式会社 大阪合金工業所 | 鋳造欠陥、偏析および酸化物の含有を抑制した銅合金鋳塊の製造方法 |
US6395059B1 (en) * | 2001-03-19 | 2002-05-28 | Noranda Inc. | Situ desulfurization scrubbing process for refining blister copper |
US6478847B1 (en) | 2001-08-31 | 2002-11-12 | Mueller Industries, Inc. | Copper scrap processing system |
JP4593397B2 (ja) * | 2005-08-02 | 2010-12-08 | 古河電気工業株式会社 | 回転移動鋳型を用いた連続鋳造圧延法による無酸素銅線材の製造方法 |
CN111961878B (zh) * | 2020-09-03 | 2022-09-09 | 宁波长振铜业有限公司 | 一种降低废杂铜中高熔点杂质元素的方法 |
CN111961877B (zh) * | 2020-09-03 | 2022-09-09 | 宁波长振铜业有限公司 | 一种净化废杂铜熔体的方法 |
CN113897508B (zh) * | 2021-09-27 | 2022-03-11 | 宁波金田铜业(集团)股份有限公司 | 一种锡青铜用清渣剂及其使用方法 |
CN113652564B (zh) * | 2021-10-19 | 2021-12-14 | 北京科技大学 | 一种利用返回料冶炼高温合金的方法 |
CN114645138B (zh) * | 2022-03-16 | 2023-11-21 | 杭州富通集团有限公司 | 铜杆的加工方法 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60162737A (ja) * | 1984-02-03 | 1985-08-24 | Nippon Steel Corp | 粗銅精錬法 |
JPS61217538A (ja) * | 1985-03-25 | 1986-09-27 | Furukawa Electric Co Ltd:The | 銅の連続溶解鋳造法 |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE346807B (ja) * | 1969-12-23 | 1972-07-17 | Boliden Ab | |
US3682623A (en) * | 1970-10-14 | 1972-08-08 | Metallo Chimique Sa | Copper refining process |
HU169980B (ja) * | 1975-04-16 | 1977-03-28 | ||
JPS52146718A (en) * | 1976-06-01 | 1977-12-06 | Kobe Steel Ltd | Method and raw material for smelting copper scrap |
JPS5412409A (en) * | 1977-06-30 | 1979-01-30 | Fuji Electric Co Ltd | Transformer for converter |
SE7909179L (sv) * | 1979-11-06 | 1981-05-07 | Boliden Ab | Forfarande for rening av icke-jernmetallsmeltor fran fremmande element |
US4318737A (en) * | 1980-10-20 | 1982-03-09 | Western Electric Co. Incorporated | Copper refining and novel flux therefor |
JPS5827939A (ja) * | 1981-08-13 | 1983-02-18 | Sumitomo Electric Ind Ltd | 電線用銅材の製造方法 |
JPS59211541A (ja) * | 1983-05-18 | 1984-11-30 | Nippon Mining Co Ltd | 粗銅の真空精製方法 |
SU1105512A1 (ru) * | 1983-05-20 | 1984-07-30 | Предприятие П/Я А-7155 | Флюс дл рафинировани черновой меди |
JPS59226131A (ja) * | 1983-06-06 | 1984-12-19 | Nippon Mining Co Ltd | 粗銅の真空精製装置 |
SE445361B (sv) * | 1984-12-12 | 1986-06-16 | Boliden Ab | Forfarande for upparbetning av sekundera metalliska smeltmaterial innehallande koppar |
SU1735410A1 (ru) * | 1990-07-04 | 1992-05-23 | Луганский Центр Научно-Технического Творчества Молодежи "Союз" | Способ плавки меди и ее сплавов |
HU209327B (en) * | 1990-07-26 | 1994-04-28 | Csepel Muevek Femmueve | Process for more intensive pirometallurgic refining primere copper materials and copper-wastes containing pb and sn in basic-lined furnace with utilizing impurity-oriented less-corrosive, morestaged iron-oxide-based slag |
-
1992
- 1992-03-25 DE DE69229387T patent/DE69229387T2/de not_active Expired - Fee Related
- 1992-03-25 CA CA002091677A patent/CA2091677C/en not_active Expired - Fee Related
- 1992-03-25 WO PCT/JP1992/000358 patent/WO1993002219A1/ja active IP Right Grant
- 1992-03-25 US US07/988,960 patent/US5364449A/en not_active Expired - Lifetime
- 1992-03-25 EP EP92907624A patent/EP0548363B1/en not_active Expired - Lifetime
-
1993
- 1993-03-12 FI FI931112A patent/FI104268B/fi not_active IP Right Cessation
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60162737A (ja) * | 1984-02-03 | 1985-08-24 | Nippon Steel Corp | 粗銅精錬法 |
JPS61217538A (ja) * | 1985-03-25 | 1986-09-27 | Furukawa Electric Co Ltd:The | 銅の連続溶解鋳造法 |
Non-Patent Citations (1)
Title |
---|
See also references of EP0548363A4 * |
Also Published As
Publication number | Publication date |
---|---|
CA2091677C (en) | 2000-10-24 |
FI104268B1 (fi) | 1999-12-15 |
FI931112A (fi) | 1993-04-08 |
FI931112A0 (fi) | 1993-03-12 |
DE69229387T2 (de) | 2000-03-23 |
EP0548363A1 (en) | 1993-06-30 |
US5364449A (en) | 1994-11-15 |
CA2091677A1 (en) | 1993-01-16 |
FI104268B (fi) | 1999-12-15 |
EP0548363A4 (ja) | 1994-01-12 |
EP0548363B1 (en) | 1999-06-09 |
DE69229387D1 (de) | 1999-07-15 |
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