JPH08218128A - Method for smelting copper - Google Patents

Abstract

PURPOSE: To increase the treating quantity of raw material are without using expensive pure oxygen in an autogeneous furnace or a blowing type smelting furnace, in a copper smelting operating method. CONSTITUTION: In the autogeneous furnace or the blowing type smelting furnace, copper sulfide ore consisting essentially of copper, iron and sulfur is simultaneously blown with the air or oxygen enriched air into the autogeneous furnace and smelted at high temp. with oxidizing combustion reaction to obtain a matte consisting essentially of the copper and molten slag consisting essentially of iron. Into these furnaces, oxidized roasting ore of the copper sulfide ore and/or the copper sulfide ore are added to the copper sulfide ore and blown. By this method, the treating quantity of the copper sulfide ore in the autogeneous furnace or the blowing type smelting method is increased to increase the copper productivity.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a copper smelting method, and more specifically, it is a copper smelting method in which copper sulfide ore is blown into a flash furnace at the same time as air or oxygen-enriched air to perform oxidative smelting. The present invention relates to a method or a copper smelting method by injection smelting (also referred to as MI method) in which copper sulfide ore is blown into a molten mat and slag from a lance at the same time as oxygen-enriched air.

Most of copper smelting in Japan is carried out by any of the above-mentioned methods, although some of the smelting is carried out by a reverberatory furnace-converter (resources and materials, 1993.1).
2, "non-ferrous smelting", pages 937-976).

By the way, in the flash smelting smelting, a small amount of solvent (silica ore, limestone, etc.), powder coke, smoke ash, and a repeating raw material between steps are used for copper sulfide ore, if necessary, in one or two.
After mixing more than one seed, it is dried, and the dried material is blown into the flash furnace at the same time as preheated air or oxygen-enriched air, and the reaction is promoted by the oxidation combustion of iron and sulfur, at a high temperature of about 60%. This is a method for producing both a copper-containing grade matte and a slag melt containing iron and silicic acid as main components.

Conventionally, in a copper smelting method using a flash furnace, air was used for oxidative combustion, so it was necessary to increase the amount of air blown in order to increase the production amount. However, the increase in the amount of air required the enhancement of the gas treatment equipment attached to the smelting furnace, which was practically impossible.
80% oxygen concentration separated from air as oxygen for combustion
The above-mentioned high-purity oxygen is used, and the oxygen-enriched air to which it is added has been used to increase the production amount of the smelting furnace (see "Non-ferrous smelting" above).

In the flash smelting process, raw materials such as copper sulfide ore are blown into the upper part of the furnace at the same time as air or oxygen-enriched air, and while reacting with oxygen while falling in a space having a height of about 5 m. The iron and sulfur in the raw material are oxidized by the reaction between the melt and the solid due to melting of the charge and the reaction between the melt and the solid. Such an oxidation reaction also occurs in a blow-type smelting furnace. That is, in this smelting method, a raw material such as copper sulfide ore is blown into a melt such as mat or slag together with oxygen-enriched air, but the basis of the reaction is the oxidation of iron and sulfur, and the reaction product is also a flash furnace. Similar mats and slags are obtained.

[0006]

The separation of oxygen from the air necessary to obtain oxygen-enriched air involves considerable power consumption. Specifically, when the applicant's smelter operation example is shown, if the production capacity of the flash furnace is increased from 75 t / h to 90 t / h (that is, 1.2 times), the cost of the oxygen plant is 1.47.
It has doubled (Non-ferrous Smelting No., Table 6 on page 973), and this tendency is becoming more and more remarkable as the production volume increases. There is a problem in terms of energy saving here. Furthermore, as the production volume of the flash smelting furnace is increased more and more, the oxygen concentration to be blown in becomes higher, and finally the operation will be carried out only with oxygen.

Originally, in the copper smelting by the flash smelting furnace, a high temperature reaction was caused by the oxidative combustion of iron and sulfur in the copper ore, which was an energy-saving type smelting method that does not require a special fuel, but With the increase in electricity cost, it cannot be said that it is an energy-saving smelting method. Here, there is a need to provide a novel copper smelting method that does not use such power consumption type oxygen in the reaction at all or can suppress it to the extent that it is not disadvantageous in terms of power consumption even if it is used.

Although the flash smelting furnace has been described above, it is necessary to use more oxygen than the present oxygen enrichment ratio (40 to 50%) in order to increase the production amount even in the blow-in type smelting furnace. And face similar issues. An object of the present invention is to provide a copper smelting method capable of improving productivity while solving the above problems.

[0009]

In order to solve the above problems, the present inventor has conducted diligent research and, as a result, oxidizes and roasts a part of copper sulfide ore into a smelting furnace such as a flash smelting furnace and Oxidation into a smelting furnace such as a flash smelting furnace by leaching copper from the ore or roasted ore with an aqueous sulfuric acid solution and mixing the remaining residue with copper sulfide ore and smelting in a smelting furnace such as a flash smelting furnace. The present invention has been completed by finding that the copper production capacity of the furnace can be increased without blowing oxygen for combustion.

That is, the first aspect of the present invention is a copper smelting method in which copper sulfide ore and air or oxygen-enriched air are simultaneously blown into a flash smelting furnace to further oxidize and roast copper sulfide ore. A copper smelting method characterized by blowing into a smelting furnace, the second of the present invention is a copper smelting method in which a copper sulfide ore and air or oxygen-enriched air are simultaneously blown into a smelting furnace to perform oxidative smelting. ,
Oxidizing roasting ore of copper sulfide ore is leached with an aqueous sulfuric acid solution, and a copper smelting method characterized by further blowing the remaining residue into a flash furnace, the third of the present invention is copper sulfide ore or air or In a copper smelting method in which oxygen-enriched air is simultaneously blown into a flash smelting furnace to oxidize and smelt, an oxidizing roasted ore of copper sulfide ore is leached with an aqueous sulfuric acid solution, and the remaining residue and oxidized roasted ore of copper sulfide ore are removed. Further, it is a copper smelting method characterized by blowing into a flash furnace.

First, oxidative roasting of copper sulfide ore common to the first to third aspects of the present invention will be described. Oxidation roasting of copper sulfide ore has been tried as a pretreatment method for recovering copper from the oxidation roasted ore by a wet method, but it is difficult to recover the copper content, gold, silver, etc. in the wet processing residue. This oxidative roasting / wet method was not industrially feasible because a large amount of material remains. or,
Although a method of reducing and smelting an oxidized roasted ore of copper sulfide in an electric furnace is also used in foreign countries, it is not a mainstream smelting method because it consumes a large amount of electric energy. On the other hand, the present invention aims to utilize the oxidized roasted ore, which is basically different from the conventional one, by positioning the oxidized roasting of copper sulfide ore as a pretreatment method for the oxidation smelting.

In the oxidation roasting of copper sulfide ore according to the present invention, it is not necessary to leave S necessary for mat formation unoxidized and to leave SO in the ore by oxidizing all or almost all of S.
This is a so-called complete roasting method in which 2 is used, but S in the ore does not necessarily become SO2, and there is no problem if it remains in the roasted ore in the form of sulfate. However, when the oxidation is stopped in the form of sulfate, the ratio of S in the ore remaining in the form of the original sulfide often becomes high, and the efficiency of oxidative roasting deteriorates. Specifically, copper grade 22 to be charged into a smelting furnace such as a flash furnace
When copper sulfide ore containing 49%, 13-32% of iron grade and 16-39% of sulfur grade is oxidized and roasted at a temperature of preferably 500 ° C. or higher and 1000 ° C. or lower, more preferably 600 ° C. or higher and 800 ° C. or lower, copper Quality 23-51%, Iron quality 14-3
Oxides of 9% and sulfur grade 6% or less are obtained. The optimum oxidation roasting temperature varies depending on the composition of the copper sulfide ore, but if the temperature is 500 ° C. or lower, the oxidation is insufficient, and if the temperature is 1000 ° C. or higher, the copper sulfide ore softens and dissolves, and the oxidation becomes insufficient. The oxidizing roasted ore thus obtained has an oxygen grade of 12 to 2
It has 3% oxygen. Sulfur in the oxidation roasting ore is preferably 0.1 to 6% or less, more preferably 4% or less.

In the first aspect of the present invention, the oxidized roasting ore is
By charging the flash furnace by a known charging means such as an ore burner, a part of the oxygen in the roasted ore is used for the oxidation reaction of iron and sulfur in the sulfide ore. The remaining oxygen becomes a slag-forming component.

In the second aspect of the present invention, the residue after leaching the oxidized roasted ore with sulfuric acid is charged into the flash furnace by an ore burner or the like, so that a part of the oxygen in the residue is iron and iron in the sulfide ore. Used for sulfur oxidation reaction. Specifically, when the roasted ore of the above components is leached with an aqueous solution containing 30 to 200 g / L of sulfuric acid, 50 to 85% of copper in the roasted ore is leached, and copper grade 1
0 to 22%, iron grade 22 to 47% and oxygen grade 10
A leaching residue of 22% is obtained. This leach residue is utilized by the oxidation reaction.

In addition to copper, the leaching residue contains gold and silver, and these noble metals are 95% by the smelting process of the residue.
It is recovered in the above high yield. Further, the wet-treated residue contains a large amount of metals such as copper, and the disposal of the residue leads to environmental pollution. Since it is processed at a high temperature of 1200 ° C or higher in the smelting furnace, the residue is converted into stable kalami containing iron and silicic acid as the main components and is effectively utilized as a cement raw material.

By leaching the oxidized roasting ore, an acidic solution having a copper concentration of 30 to 100 g / L is obtained. From this solution, the copper content is extracted by a known method, for example, a solvent extraction method, Further, it is back-extracted with a sulfuric acid solution to obtain a normal copper-sulfuric acid solution. From this solution, a purity of 99.
99% copper bullion can be recovered. The second aspect of the present invention described above is suitable for smelting sulfide ore having a high copper grade of 40 to 45%.

A third aspect of the present invention is a method in which the first roasting ore for oxidation and the second leaching residue for the same are shared, and an ore having a high copper grade and an ore having a low copper grade are provided in one smelter. Suitable for processing.

In the first to third aspects of the present invention, the proportion of oxidized roasted ore and / or leaching residue (hereinafter referred to as "oxidized roasted ore") is 5 to 50% by weight with respect to the entire copper ore. Is preferred. If this ratio is less than 5%, the amount of oxygen supplied from the oxidizing roasting ore or the like will be insufficient, leading to a decrease in production efficiency or an increase in electric power cost, while the above ratio is 50%.
If it exceeds%, the amount of S for forming a mat is insufficient, and the recovery yield of valuable metals such as copper decreases. More preferable results are obtained when the proportion of the oxidizing roasting ore is 10 to 30% by weight.

According to the first to third embodiments of the present invention,
Oxidation smelting can be done with air. If this method is implemented, the smelter will be a simple facility without oxygen production facilities, and equipment costs, maintenance costs, operating costs, etc. will be reduced. on the other hand,
The production amount can be increased by using a part of oxygen in the oxidation roasting ore for the oxidation reaction of iron and sulfur. In this method, the proportion of oxidized roasted ore in the total copper ore is preferably 10 to 30% by weight.

According to the first to third alternative embodiments of the present invention, the oxidative smelting can preferably be carried out with 21-30% oxygen enriched air. This method becomes an embodiment in a current smelter having an oxygen production facility, and the production amount is increased by performing an oxidation reaction by an oxidizing roasting ore without or together with the capacity enhancement of the facility. be able to.

In the present invention, the copper sulphide ore, the roasting oxide ore and / or the leaching residue are uniformly mixed in advance and blown into the flash smelting furnace, whereby a solid-solid reaction between these oxides and copper sulphide or The melt-melt reaction can be accelerated.

Although the constitution of the present invention has been described in detail above, the solvent, powder coke, auxiliary fuel, smoke ash, utilization method / conditions for repeating between steps, etc. in the flash smelting furnace are known. It goes without saying that these techniques can be appropriately adopted depending on the situation.

The above-mentioned additional blowing of the roasted copper sulfide ore characterized by the present invention can be applied to the blow-type smelting method. In this case, the copper sulfide ore and its oxidized roasted ore and It is possible to additionally blow in the leaching residue of the roasted ore.
Further, the specific configuration described in paragraph numbers 0012 to 0018 and 0021 can be appropriately adopted.

[0024]

In the present invention, oxygen contained in the form of an oxide in the oxidation roasting ore and / or sulfuric acid leaching residue of copper sulfide ore is used for the oxidation reaction of iron and sulfur of copper sulfide ore. Increase the production capacity of the smelting furnace. Here, the copper oxide in the oxidizing and roasting ore is not transferred to the slag as it is, but is recovered in the mat with a yield comparable to that of the conventional smelting method. Less than,
The present invention will be described in more detail by way of examples.

[0025]

【Example】

Example 1 Copper sulfide ore containing 30% of copper, 30% of sulfur and 25% of iron was oxidized and roasted at 700 ° C. in a fluidized-bed roasting furnace to obtain copper grade 35%, iron grade 29%, oxygen. 16% roasted ore 190
kg is mixed with 1340 kg of copper sulphide ore and 9 per hour
When 1.8 tons of the mixture and a small amount of solvent were charged into the flash furnace at the same time as air having a temperature of 870 ° C. and 770 Nm 3 / min and 30 m 3 / min oxygen (oxygen concentration 95%), Table 1 in FIG.
As shown in (3), a mat with a copper grade of about 60%, an iron grade of 15%, a sulfur grade of 23% and a slag with an iron grade of 38% and a silicic acid grade of 32% were obtained. A mat having a copper content of 27.8 tons could be obtained, and an increase treatment of about 1.3 times was possible as compared with Comparative Example 1 described later. A process diagram of Example 1 is shown in FIG.

Example 2 Copper sulfide ore having a copper grade of 43%, an iron grade of 17% and a sulfur grade of 30% was oxidized and roasted at 730 ° C., and the roasted ore was leached with an aqueous solution containing sulfuric acid (sulfuric acid concentration 120 g / L). As a result, 80% of the copper content in the roasted ore was leached, and copper grade was 19% and iron grade was 37.
%, Oxygen residue 17% was obtained. This residue is 31
0 kg is mixed with 1340 kg of copper sulfide ore and 99 per hour
Tonnes of mixture and a small amount of solvent, air at a temperature of 950 ° C., air of 770 Nm3 / min and oxygen of 30 m3 / min (oxygen concentration 95
%) At the same time, the copper grade was about 60%, the iron grade was 15%, and the sulfur grade was 2 as shown in Fig. 1 (Table 1).
A matte of 3% and a slag of 38% iron grade and 32% silicic acid grade were obtained. The copper in the leaching solution was 70 g / L, and the purity was 99.99% by solvent extraction and electrowinning.
The copper ingot of this was easily recovered. A mat of 27.2 tons of copper and 14 tons of copper metal were obtained. As a result, an increase process of about 1.9 times as compared with Comparative Example 1 described later was made possible. A process drawing of the second embodiment is shown in FIG.

Comparative Example 1 Copper sulphide ore containing 30% of copper, 30% of sulfur and 25% of iron 1
A small amount of solvent, 72 tons per hour, was charged into the flash furnace together with air at a temperature of about 820 ° C and 770 Nm3 / min of oxygen (oxygen concentration 95%) at 30 m3 / min. ), A mat with a copper grade of 60%, an iron grade of 15%, a sulfur grade of 23% and a slag with an iron grade of 38% and a silicic acid grade of 32% were obtained. Only 21.4 tonnes of matte could be produced and the amount of copper could not be increased.

Comparative Example 2 In order to increase production in the flash smelting furnace of Comparative Example 1, copper sulfide ore containing 30% copper, 30% sulfur and 25% iron was added at 80.80% per hour.
4 tons of a small amount of solvent, air at a temperature of about 800 ° C, 740 Nm 3 / min and 60 m 3 / min oxygen (oxygen concentration 95%)
It was charged into the flash furnace together with, and as shown in Figure 2 (Table 2), copper grade 60%, iron grade 15%, sulfur grade 23% matte and iron grade 38%, silicic acid grade 32% slag. was gotten. In this example, the amount of oxygen was set to 60 m @ 3, which was twice as large as that in Comparative Example 1 in order to try the increase treatment, but only a matte of 23.8 tons in terms of copper amount was obtained, which was not a preferable operation.

[0029]

In the past, expensive oxygen was required to increase the production of copper in a smelting furnace such as a flash smelting furnace, but as described above, according to the present invention, even if expensive oxygen is not used, It has become possible to oxidize and roast a part of copper sulfide ore in advance, and effectively use the oxygen that has reacted with copper and iron obtained here in a smelting furnace such as a flash furnace. Further, since roasting of copper sulfide ore becomes self-burning roasting, the increase in fuel cost due to the addition of the roasting step is of little concern. Furthermore, since the leaching residue after oxidation and roasting can be effectively used in a smelting furnace such as a flash smelting furnace, for example, for a copper raw material with high copper-containing grade, There was also an economic effect that copper bullion could be directly recovered at a lower cost than processing in a smelting furnace.

[Brief description of drawings]

FIG. 1 is a chart (Table 1) showing a physical quantity balance of a smelting method according to an example of the present invention.

FIG. 2 is a chart showing a physical quantity balance of a smelting method according to a comparative example.

FIG. 3 is a process chart of Example 1 of the present invention.

FIG. 4 is a process diagram of Example 2 of the present invention.

[Procedure amendment]

[Submission date] January 30, 1996

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction content]

In the oxidation roasting of copper sulfide ore according to the present invention, it is not necessary to leave S necessary for mat formation unoxidized and to leave SO in the ore by oxidizing all or almost all of S.
_This is a so-called complete roasting method in which 2 is used, but S in the ore does not necessarily become SO _2, and there is no problem even if it remains in the roasted ore in the form of sulfate. However, when the oxidation is stopped in the form of sulfate, the ratio of S in the ore remaining in the form of the original sulfide often becomes high, and the efficiency of oxidative roasting deteriorates. Specifically, copper grade 22 to be charged into a smelting furnace such as a flash furnace
When copper sulfide ore containing 49%, 13-32% of iron grade and 16-39% of sulfur grade is oxidized and roasted at a temperature of preferably 500 ° C. or higher and 1000 ° C. or lower, more preferably 600 ° C. or higher and 800 ° C. or lower, copper Quality 23-51%, Iron quality 14-3
Oxides of 9% and sulfur grade 6% or less are obtained. The optimum oxidation roasting temperature varies depending on the composition of the copper sulfide ore, but if the temperature is 500 ° C. or lower, the oxidation is insufficient, and if the temperature is 1000 ° C. or higher, the copper sulfide ore softens and dissolves, and the oxidation becomes insufficient. The oxidizing roasted ore thus obtained has an oxygen grade of 12 to 2
It has 3% oxygen. Sulfur in the oxidation roasting ore is preferably 0.1 to 6% or less, more preferably 4% or less.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] 0025

[Correction method] Change

[Correction content]

[0025]

Example 1 Copper sulfide ore containing 30% of copper, 30% of sulfur and 25% of iron was oxidized and roasted at 700 ° C. in a fluidized-bed roasting furnace to obtain a copper grade of 35% and an iron grade. Roasted ore 190 with 29% and oxygen grade 16%
kg is mixed with 1340 kg of copper sulphide ore and 9 per hour
When 1.8 tons of the mixture and a small amount of solvent were charged into the flash furnace at the same time as air having a temperature of 870 ° C. of 770 Nm ³ / min and 30 m ^{3 /} min of oxygen (oxygen concentration 95%), the table of FIG. 1
As shown in (3), a mat with a copper grade of about 60%, an iron grade of 15%, a sulfur grade of 23% and a slag with an iron grade of 38% and a silicic acid grade of 32% were obtained. A mat having a copper content of 27.8 tons could be obtained, and an increase treatment of about 1.3 times was possible as compared with Comparative Example 1 described later. A process diagram of Example 1 is shown in FIG.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0026

[Correction method] Change

[Correction content]

Example 2 Copper sulfide ore having a copper grade of 43%, an iron grade of 17% and a sulfur grade of 30% was oxidized and roasted at 730 ° C., and the roasted ore was leached with an aqueous solution containing sulfuric acid (sulfuric acid concentration 120 g / L). As a result, 80% of the copper content in the roasted ore was leached, and copper grade was 19% and iron grade was 37.
%, Oxygen residue 17% was obtained. This residue is 31
0 kg is mixed with 1340 kg of copper sulfide ore and 99 per hour
Ton of mixture and a small amount of solvent, air at a temperature of 950 ° C. and oxygen of 770 Nm ³ / min and 30 m ^{3 /} min (oxygen concentration 95
%) At the same time, the copper grade was about 60%, the iron grade was 15%, and the sulfur grade was 2 as shown in Fig. 1 (Table 1).
A matte of 3% and a slag of 38% iron grade and 32% silicic acid grade were obtained. The copper in the leaching solution was 70 g / L, and the purity was 99.99% by solvent extraction and electrowinning.
The copper ingot of this was easily recovered. A mat of 27.2 tons of copper and 14 tons of copper metal were obtained. As a result, an increase process of about 1.9 times as compared with Comparative Example 1 described later was made possible. A process drawing of the second embodiment is shown in FIG.

[Procedure amendment 4]

[Document name to be amended] Statement

[Name of item to be corrected] 0027

[Correction method] Change

[Correction content]

Comparative Example 1 Copper sulphide ore containing 30% of copper, 30% of sulfur and 25% of iron 1
A small amount of solvent of 72 tons per hour was charged into the flash smelting furnace together with air having a temperature of about 820 ° C. and oxygen (oxygen concentration 95%) of 770 Nm ³ / min and 30 m ^{3 /} min. As shown in Table 2), a mat with 60% copper grade, 15% iron grade, 23% sulfur grade and slag with 38% iron grade and 32% silicic acid grade were obtained. Only 21.4 tonnes of matte could be produced and the amount of copper could not be increased.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0028

[Correction method] Change

[Correction content]

Comparative Example 2 In order to increase production in the flash smelting furnace of Comparative Example 1, copper sulfide ore containing 30% copper, 30% sulfur and 25% iron was added at 80.80% per hour.
4 tons of a small amount of solvent, air at a temperature of about 800 ° C., oxygen of 740 Nm ³ / min and 60 m ^{3 /} min (oxygen concentration 95%)
It was charged into the flash furnace together with, and as shown in Figure 2 (Table 2), copper grade 60%, iron grade 15%, sulfur grade 23% matte and iron grade 38%, silicic acid grade 32% slag. was gotten. In this example, the amount of oxygen was set to 60 m ^{3 which} is twice as much as that in Comparative Example 1 in order to try the increase treatment, but only a matte of 23.8 tons in terms of copper amount was obtained, which was not a preferable operation.

Claims (11)

[Claims] 1. In a copper smelting method in which copper sulfide ore is blown into an autoclave at the same time as air or oxygen-enriched air, an oxidizing roasted ore of copper sulfide is blown into the autoclave. Characteristic copper smelting method. 2. A copper smelting method in which copper sulfide ore is blown into an autoclave at the same time as air or oxygen-enriched air to be oxidized and smelted, and an oxidizing roasted ore of copper sulfide ore is leached with an aqueous sulfuric acid solution to leave a residue. The method for smelting copper is further characterized by blowing the mixture into a flash furnace. 3. A copper smelting method in which copper sulfide ore is blown into an autoclave at the same time as air or oxygen-enriched air to be oxidized and smelted. A copper smelting method, characterized by further blowing an oxidation roasting ore of copper sulfide ore into a flash furnace. 4. The oxidation roasting ore and / or the entire copper ore
Or the said leaching residue is 5 to 50 weight%, The copper smelting method in any one of Claim 1 to 3 characterized by the above-mentioned. 5. The copper smelting method according to claim 1, wherein the oxidation smelting is performed with air. 6. The method according to claim 1, wherein the oxidative smelting is performed with oxygen-enriched air.
5. The copper smelting method according to any one of 1 to 4. 7. Oxidative roasting of copper sulfide ore is performed at 500 to 1000.
The copper smelting method according to any one of claims 1 to 6, wherein the copper smelting method is performed at ℃. 8. The copper sulphide ore, the oxidation roasting ore and / or the leaching residue are preliminarily uniformly mixed and blown into a flash smelting furnace according to any one of claims 1 to 7. Copper smelting method. 9. A copper smelting method of blowing copper sulfide ore simultaneously with oxygen-enriched air into a molten mat and a slag, further comprising blowing an oxidizing roasted ore of copper sulfide ore. 10. A copper smelting method in which copper sulfide ore is blown into a molten mat and slag at the same time as oxygen-enriched air, in which an oxidizing roasted ore of copper sulfide ore is leached with a sulfuric acid solution, and the remaining residue is further blown. Copper smelting method characterized by. 11. A copper smelting method in which copper sulfide ore is blown into a molten mat and slag at the same time as oxygen-enriched air, and a residue of copper sulfide ore oxidized and roasted is leached with sulfuric acid. A copper smelting method characterized by further blowing in a sinter.