JP5306136B2 - Method of charging ore raw material and solvent into smelting furnace - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for charging an ore raw material and a solvent to a refining furnace, by which an increase in the variation of the grade of SiO<SB>2</SB>in slag which has been a problem in the conventional method is suppressed as far as possible, and which can achieve stabilization of slag components. <P>SOLUTION: In the method for charging the ore raw material and the solvent to the refining furnace, a pulverized and dried solvent 10 mainly composed of silicic acid ore is conveyed to directly before a refining furnace by a first conveyance system, on the other hand, a pulverized and dried ore raw material 20 is conveyed to directly before the refining furnace by a second conveying system, and the solvent 10 and the ore raw material 20 are mixed directly before their charge to the refining furnace and are then charged to the refining furnace. In the method, the solvent 10 is charged within a chamber 31 into an air flow where the ore raw material 20 is conveyed by an air current by a pneumatic tube 21, then they are uniformly mixed, and thereafter, the mixture is charged to the refining furnace. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a method for charging an ore raw material and a solvent into a smelting furnace, and more specifically, a pulverized and dried solvent composed mainly of silicate ore is transported by a first transport system to immediately before the smelting furnace, To the smelting furnace where the crushed and dried ore raw material is transported to the smelting furnace by the second transport system, and the solvent and the ore raw material are mixed and charged immediately before the smelting furnace is charged. Relates to a method for charging ore raw materials and solvents.

In copper smelting, Fe in copper ore is oxidized in a smelting furnace such as a flash smelting furnace or a reflection furnace and combined with SiO ₂ added as a solvent to form slag, and Cu is concentrated as a mat of sulfide melt. Then, SiO ₂ as the solvent that was ground silicate mineral is used. Silicate ores are crushed to a particle size almost the same as that of copper concentrate, and generally to an average particle size of about 100 μm. The specific amount used is the weight ratio of copper concentrate. About 10%.

  Conventionally, for example, as shown in Patent Document 1, the solvent is dried and pulverized together with copper concentrate as an ore raw material, and then charged into a smelting furnace such as a flash furnace. However, in recent years, the demand for copper has increased as the amount of ore processing increases due to the decline in copper quality in copper concentrates, and the increase in production of electronic devices such as home appliances and computers has increased copper production. It was desired. Along with this, the amount of solvent used has also increased.

  Therefore, the applicant of the present application does not significantly increase the number of facilities and the transportation system, and the equivalent of the weight that has been used for drying or transporting the solvent for the drying of the ore and the drying of the solvent and the constituent raw materials until now. By switching to drying, we invented a method for operating a non-ferrous metal smelter capable of increasing the throughput of copper concentrate and filed a patent application (Patent Document 2). In the method shown in Patent Document 2, silicate ore as a solvent and crushed and dried copper concentrate are transported by separate dedicated transport systems and transported by a dry ore conveyor immediately before charging into a smelting furnace. The solvent is added to the incoming copper concentrate. According to this method, it is possible to dedicate the dryer for ore drying without significantly increasing the number of facilities and the transportation system, and the weight equivalent to the previous drying and transportation of the solvent is transferred to the ore drying. This makes it possible to increase the copper concentrate throughput.

Japanese Patent No. 3307444 JP 2009-68062 A

  As described above, in the operation method of the non-ferrous metal smelter of Patent Document 2, the solvent processing / transport system and the copper concentrate processing / transport system are separated in order to enable an increase in copper production. Specifically, as shown in FIG. 6, for the copper concentrate 20, after drying with a dryer (not shown), it is sent to the dust chamber 31 by the air feeding pipe 21, and further via the dry ore flow conveyor 33, The smelting furnace is charged into the smelting furnace. On the other hand, with respect to the solvent 10, the raw material silicate ore is crushed by the ball mill 11, transported to the 200 t solvent bottle 13 by the aprobator 12, and then passed through the high flow lift 14, air slider 15, 20 t solvent bottle 18, and screw The copper concentrate 20 is transported onto a dry ore flow conveyor 33 that conveys the copper concentrate 20 and is charged into the flash smelting furnace together with the copper concentrate 20.

  However, in the above charging method, the copper concentrate was dropped and supplied from the dust chamber onto the dry ore flow conveyor by opening and closing the seal damper. There is a problem that the concentration of the solvent changes even if the solvent is supplied in a certain amount. In addition, the screw conveyor used for cutting out the solvent may cause a large flow, which may cause variations in the amount of solvent introduced.

In addition, since the solvent was just put on the copper concentrate (dry ore) flowing through the dry ore flow conveyor, the solvent and the copper concentrate were not sufficiently stirred, and the amount of the solvent introduced varied. In some cases, it became non-uniform, and this was reflected as it was in the charging ore, and the quality of SiO ₂ in the produced slag could vary. If the SiO ₂ grade in the slag varies, unrecovered copper remains in the slag, and the slag loss increases. In this regard, in the case of the above-described charging method, the SiO ₂ quality variation in the copper concentrate was 8 to 47% (see FIG. 4). In this case, it is thought that the conventional problems can be solved by installing a stirrer in the post-process rather than the dry ore flow conveyor that transports copper concentrate to the flash furnace, but such a stirrer is installed on the equipment. It is extremely impractical to secure a place to do this, and a large-scale capital investment is required.

Therefore, the present invention makes it possible to use a dryer exclusively for ore drying without greatly increasing the number of equipment and the transport system in the conventional method, and by transferring the equivalent of the weight previously dried and transported to ore drying to a copper ore. To a smelting furnace capable of stabilizing the slag component by minimizing the increase in SiO ₂ grade variation in the slag, which was a problem of the conventional method, while maintaining the increase in the concentrate processing amount An object of the present invention is to provide a method for charging ore raw materials and solvents.

  In order to achieve the above object, the invention described in claim 1 is characterized in that a pulverized and dried mainly silicate ore solvent is conveyed by the first conveying system just before the smelting furnace, while the pulverized and dried ore raw material is a first one. Method of charging ore material and solvent into the smelting furnace, transported immediately before the smelting furnace by the transport system of 2, and mixed with the solvent and ore raw material just before charging into the smelting furnace. In this method, the solvent is introduced into the air stream in which the ore raw material is being air-carryed and mixed uniformly, and then charged into the smelting furnace.

  In order to achieve the above object, the invention according to claim 2 is characterized in that the pulverized and dried mainly silicate ore solvent is conveyed by the first conveying system to just before the smelting furnace, while the crushed and dried ore raw material is Method of charging ore material and solvent into the smelting furnace, transported immediately before the smelting furnace by the transport system of 2, and mixed with the solvent and ore raw material just before charging into the smelting furnace. In the above, the ore raw material conveyed by airflow through the air pipe is collected, and the ore is introduced into the chamber by supplying a solvent into the chamber that supplies the recovered ore raw material to a conveying conveyor for conveying the recovered ore raw material to the smelting furnace. A raw material and a solvent are uniformly mixed in an air stream, and then charged into a smelting furnace by a conveyor.

  In order to achieve the above object, the invention described in claim 3 is a method for charging an ore material and a solvent that have not been recovered in a chamber in the method for charging an ore material and a solvent into a smelting furnace according to claim 2. Or 2 or more cyclones are arrange | positioned and the ore raw material and solvent which were collect | recovered by the cyclone are further supplied to a conveyance conveyor, It is characterized by the above-mentioned.

  In order to achieve the above object, the invention described in claim 4 is the method of charging the ore material and the solvent into the smelting furnace according to claim 3, wherein the ore material and the solvent not recovered by the cyclone are removed by a bag filter. It is recovered and charged into a smelting furnace.

According to the method of charging the ore raw material and the solvent into the smelting furnace according to the present invention, by introducing the solvent into the chamber, the capital investment is minimized, and the airflow flowing through the chamber is sufficient. Since the stirring effect is also obtained, it is possible to suppress variations in the quality of SiO ₂ in the slag. As a result, the reaction in the furnace can be made uniform, and the slag component can be stabilized. As a result, the slag loss is reduced and the copper recovery rate is improved.

It is explanatory drawing which shows the charging equipment for implementing the charging method of the ore raw material and the solvent to the smelting furnace which concerns on this invention. It is an enlarged view near the chamber It is a figure which shows the sampling position of a dust removal apparatus. Is a graph showing the quality of the SiO ₂ in the conventional method. Is a graph showing the quality of the SiO ₂ in the method of the present invention. It is explanatory drawing which shows the charging equipment for implementing the charging method of the ore raw material and the solvent to the conventional smelting furnace.

  Hereinafter, a method for charging an ore raw material and a solvent into a smelting furnace according to the present invention will be described based on a preferred embodiment. FIG. 1 is an explanatory view showing a charging facility for carrying out a method for charging an ore raw material and a solvent into a smelting furnace according to the present invention.

  The charging facility shown in FIG. 1 includes a first transport system for transporting a pulverized and dried solvent 10 mainly composed of silicate ore to a smelting furnace, and a crushed and dried ore raw material 20 just before the smelting furnace. The solvent 10 and the ore raw material 20 are mixed immediately before charging into the smelting furnace and charged into the smelting furnace.

  First, the 1st conveyance system which conveys the solvent 10 to just before a smelting furnace is demonstrated. First, the silicate ore used as the solvent 10 is transported from the storage location to the pulverizer 11 by a silicate ore transport facility (not shown), and is finely pulverized by the pulverizer 11 so that the average particle size is about 100 μm. The pulverized solvent 10 is transported to a solvent bottle 13 by an eprobeta 12 where it is temporarily stored. The solvent bottle 13 has a size that accommodates about 200 t of the solvent 10.

  The solvent 10 stored in the solvent bottle 13 is cut out by a predetermined amount from the solvent bottle 13, carried to the roof level of a smelting furnace (not shown) by a high flow lift 14, and continuously provided on the outlet side of the high flow lift 14. It is carried to the air slider 15. The air slider 15 is connected to the chamber 31, which will be described later.

  Next, the 2nd conveyance system which conveys the ore raw material 20 just before a smelting furnace is demonstrated. The ore raw material 20 is dried by a dryer and a cage mill (not shown) and finely pulverized to an average particle size of about 100 μm. The crushed ore raw material 20 is air-flowed through a pneumatic tube 21 to a chamber 31 installed near the roof level of a smelting furnace (not shown). In addition, the airflow conveyance in the air pipe 21 is performed by the intake of the exhaust gas fan.

  The ore raw material 20 conveyed to the chamber 31 by airflow is dropped by gravity due to a decrease in the flow velocity in the chamber 31 and collected in the lower portion of the chamber 31, and as it is in a smelting furnace (flash furnace) not shown by the dry ore flow conveyor 33. It is transported to the loading entrance. In addition, the dry ore flow conveyor 33 is provided with two systems of 1 system and 2 system in parallel.

  On the other hand, as shown in FIG. 2, two primary cyclones 35 a and six secondary cyclones 35 b are disposed behind the chamber 31, and the ore raw material 20 and the solvent 10 that cannot be recovered by the chamber 31 are disposed. It is configured to collect and supply to the dry ore flow conveyor 33. In FIG. 2, only one primary cyclone 35a and three secondary cyclones 35b are shown, but they are also arranged in parallel on the back side of the figure.

  A screw conveyor 16 and a rotary valve 17 are disposed between the air slider 15 and the chamber 31 in order to supply the solvent conveyed by the high flow lift 14 to the chamber 31, and are conveyed via the air slider 15. The solvent that has been introduced is further conveyed through the screw conveyor 16, and a predetermined amount is introduced into the chamber 31 by the rotary valve 17. As a result, the solvent is mixed with the ore raw material 20 in the air flow in the chamber 31 and supplied to the dry ore flow conveyor 33 in a uniform state. Then, the mixture of the ore raw material 20 and the solvent supplied to the dry ore flow conveyor 33 is removed of dust by the dust removing device 37 and charged into a smelting furnace (not shown) via the dry ore bottle 39.

  On the other hand, the ore raw material 20 and the solvent 10 that could not be captured in the chamber 31 are recovered by the primary cyclone 35 a and the secondary cyclone 35 b and supplied to the dry ore flow conveyor 33. Although not shown, a bag filter is installed behind the primary cyclone 35a and the secondary cyclone 35b, and the ore raw material 20 and the solvent 10 that could not be captured by the primary cyclone 35a and the secondary cyclone 35b are finally obtained. The ore raw material 20 and the solvent 10 recovered by the bag filter are charged into a smelting furnace (not shown).

As described above, according to the method for charging the ore raw material and the solvent into the smelting furnace according to the present invention, the solvent 10 is placed in the chamber 31 for collecting the ore raw material 20 that is conveyed by the air flow through the air pipe 21. It is possible to suppress variations in the SiO ₂ quality in the slag because the ore raw material 20 and the solvent 10 that have been introduced and mixed in the air stream are charged into the smelting furnace by the dry ore flow conveyor 33. It becomes. This also reduces slag loss and increases the copper recovery rate.

Next, with respect to the charging method of the ore raw material and the solvent into the smelting furnace, the SiO ₂ quality of the charging ore according to the conventional method and the method of the present invention was measured, and the comparison results are shown in FIG. 4 and FIG. For the measurement sample, a sampling container is placed at the position shown in FIG. 3 of the dust removal device 37 (see FIG. 1) installed in the subsequent process of the dry ore flow conveyor 33, and the mixture of the ore raw material 20 and the solvent 10 is separated by 10 minutes. Collected at Here, FIG. 3 is a diagram showing a sampling position of the dust removing device 37, and is a view of the dust removing device 37 as viewed from directly above. In addition, since the dry ore flow conveyor 33 has two systems of 1 system and 2 systems in parallel, each location of both systems (6 locations of 1 system A, B, C and 2 systems A, B, C) ). The dry ore flow conveyor 33 is transported in one system at a concentrate of 90 tons / hour, a solvent of 10 tons / hour, and a total amount of 100 tons / hour.

As a result, the grade of SiO ₂ of the charging ore in the conventional method is 8 to 47%, average 24% (see FIG. 4), and the grade of SiO ₂ of the charging ore in the method of the present invention is 16 to 19% and average 17 % (See FIG. 5). In addition, since the solvent 10 can be mixed more uniformly than the conventional method, the slag loss can be reduced by about 0.07%.

  As described above, the preferred embodiment of the present invention has been described in detail. However, the present invention is not limited to the specific embodiment, and within the scope of the gist of the present invention described in the claims, Needless to say, various modifications and changes are possible.

DESCRIPTION OF SYMBOLS 10 Solvent 11 Crusher 12 Eprobeta 13 Solvent bottle 14 High flow lift 15 Air slider 16 Screw conveyor 17 Rotary valve 18 Solvent bottle 19 Screw conveyor 20 Ore raw material 21 Pneumatic feed pipe 31 Chamber 35a Primary cyclone 35b Secondary cyclone 33 Dry ore flow conveyor 37 Garbage removal device 39

Claims (4)

The pulverized and dried mainly silicate ore solvent is transported to the smelting furnace by the first transport system, while the crushed and dried ore raw material is transported to the smelting furnace by the second transport system, In the method for charging the ore raw material and the solvent into the smelting furnace, which is mixed immediately before charging the solvent and the ore raw material into the smelting furnace and charged into the smelting furnace,
A method for charging an ore material and a solvent into a smelting furnace, wherein the solvent is charged into an air stream in which the ore material is conveyed and mixed uniformly and then charged into the smelting furnace. . The pulverized and dried mainly silicate ore solvent is transported to the smelting furnace by the first transport system, while the crushed and dried ore raw material is transported to the smelting furnace by the second transport system, In the method for charging the ore raw material and the solvent into the smelting furnace, which is mixed immediately before charging the solvent and the ore raw material into the smelting furnace and charged into the smelting furnace,
The chamber is prepared by collecting the ore material that is conveyed by airflow through an air pipe and introducing the solvent into a chamber that supplies the recovered ore material to a conveyor for conveying the collected ore material to the smelting furnace. The ore raw material and the solvent are uniformly mixed in an air current in the air, and then charged into the smelting furnace by the transport conveyor. The method for charging the ore raw material and the solvent into the smelting furnace. In the charging method of the ore raw material and the solvent to the smelting furnace according to claim 2,
One or more cyclones for recovering ore raw materials and solvents not recovered in the chamber are arranged, and the ore raw materials and solvents recovered by the cyclones are further supplied to the conveyor. Ore raw material and solvent charging method. In the charging method of the ore raw material and the solvent to the smelting furnace according to claim 3,
A method for charging an ore material and a solvent into a smelting furnace, wherein the ore material and the solvent not recovered by the cyclone are recovered by a bag filter and charged into the smelting furnace.

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