JPS643931B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a copper manufacturing method that can prevent deposits from accumulating on the tip of a lance.

``Prior art'' In general, continuous copper smelting is a smelting process in which copper ore is smelted with pretreated powder concentrate and oxygen-enriched air through a top blowing lance into a smelting furnace. In the separation process, the solution overflowing from the furnace is introduced into a separation furnace and separated into glue and tangles. It consists of three processes: the copper manufacturing process, which converts to

For example, in the copper making furnace 1 shown in FIGS. 4 and 5, a blower lance 12 is provided in the upper part of the furnace body 11, and oxygen-enriched air is sent into the solution 13 from the blower lance 12.

In addition, the reference numeral 14 in the figure is a charging lance with a double pipe structure, and a pressurized tank 15 in which lime is stored is connected to the inner pipe, and the lime is transferred from the inner pipe to the outer pipe. The fluidity of the solution is improved by feeding oxygen-enriched air into the solution 13 from between the inner tube and feeding lime into the solution.

``Problems to be Solved by the Invention'' By the way, in the above-mentioned copper manufacturing method, the gas such as air or oxygen-enriched air blown out from the tip of the lance is very high-velocity; There was a problem in that splash was generated and this splash adhered to the tip of the lance, closing the opening at the tip of the lance. In addition, in order to remove the deposits on the lance tip, the worker must periodically tap the top of the lance to cause the deposits to fall off, or the worker must stop the air blowing inside the lance and melt the deposits on the lance tip. The former method is not only time-consuming but also puts a heavy burden on the worker, while the latter method melts the lance tip along with the deposits, making it necessary to add more lances. There was a problem that there was. There was also the problem that such work reduced the operating rate of the furnace.

``Object of the Invention'' The present invention provides a copper manufacturing method that can prevent deposits from accumulating on the tip of a lance and clogging it, and can save a large amount of cost for removing deposits. The purpose is to provide.

"Process leading up to the invention" When investigating the long history of use of lances in the above-mentioned copper manufacturing method, it was found that the charging lance 14, which feeds lime together with air, is unlikely to suffer from the above-mentioned problems; It was found that the tip of the tube was less likely to become occluded. The reason for this is that the lime powder blown out at high speed from the lance tip hits the deposits on the lance tip and abrades them or removes them by impact. Therefore, a method can be considered in which the amount of lime is increased, all four lances are used as charging lances, and lime is passed through all of these charging lances. However, the amount of lime charged into the copper furnace is determined by the amount and grade of glue entering the furnace and cannot be increased. Furthermore, if the amount of lime is increased, it is necessary to increase the heating by the auxiliary burner for heat balance, and more fuel is required.

``Means for Solving the Problems'' Therefore, the present inventors searched for a granular material that would not affect the heat balance in the furnace even when it was supplied into the copper-making furnace through a lance, and found that devised a method in which high-copper-grade powdered material such as precipitated copper and granular solid fuel sufficient to melt the high-copper-grade powdered material are simultaneously blown from a lance into a furnace. The high-copper-grade powder material such as precipitated copper is made by mixing a powder-grained copper raw material with a high copper content with a powder-grain solvent such as lime as necessary, and it is not introduced into the copper-making furnace from the separation furnace. It is different from.
According to this method, the temperature inside the furnace can be lowered by blowing high-copper-grade powder material as a refrigerant.
By supplementing with the combustion heat of granular solid fuel, deposits on the lance can be efficiently removed without affecting the heat balance in the copper making furnace, and it can also be used to process high copper grade powder materials such as precipitated copper. It has the advantage of

"Example" Hereinafter, one method according to the present invention will be described with reference to FIGS. 1 to 3. In addition, in these figures, the same reference numerals are given to the parts having the same configuration as those of the conventional example, and the explanation thereof will be omitted.

1 and 2 are diagrams showing a copper making furnace 2 used in the copper making method according to the present invention. This copper making furnace 2 is provided with four top blowing charging lances (lances) 14 having a double pipe structure. This charging lance 14 has an outer tube 14a and an inner tube 14b, and the tip thereof is as shown in FIG.
The distal end of the inner tube 14b is located above the distal end of the outer tube 14a. Further, pressurized tanks 15 are connected to the inner pipes 14b of these charging lances 14, respectively. This pressurized tank 15
has powder stored therein, and the inner pipe 1
Powder is supplied into the furnace body 11 through 4b. In addition, gases such as oxygen-enriched air,
It is blown into the furnace body 11 through the space between the outer tube 14a and the inner tube 14b.

In this copper manufacturing method, a high copper grade powder material made of powder precipitated copper, etc. to which a solvent has been added as necessary, and this high copper grade powder material are placed in the pressurized tank 15. The amount of heat required for melting powdered solid fuel such as powdered coal is mixed and stored, and this is transferred to the inner pipe 14 of the charging lance 14.
At the same time, oxygen-enriched air is sent into the furnace 11 through the outer tube 14a and the inner tube 14b.

In this copper manufacturing method, the powdered precipitated copper and powdered coal are blown through the inner tube 14b of the charging lance 14, so the powder blown out from the tip of the inner tube 14b is as shown in Fig. 3. As shown by the arrow in , it is sprayed onto the inner wall of the distal end opening of the outer tube 14a to remove deposits on the inner wall of the distal opening.

In this manner, in this copper manufacturing method, deposits on the tip of the lance can be removed by abrasion caused by powder particles, and the opening at the tip of the lance can be prevented from being clogged. Therefore, it is possible to omit the work to remove deposits from the tip of the lance, thereby reducing the time and labor involved, and the number of lances to be added can be reduced. Moreover, for this reason, the number of inspections of the lance tip can be reduced, the operating rate of the furnace can be improved, and the operation can be stabilized. Furthermore, since deposits on the tip of the lance are constantly removed and good air circulation is maintained, oxygen efficiency and thermal efficiency are improved. In addition, since powdered coal is charged with the amount of heat required to melt the powdered precipitated copper, it is possible to compensate for the lack of heat due to the charging of the precipitated copper. Can handle refrigerants.

In the above embodiment, powdered precipitated copper is used as the high copper grade powder material, but it is not limited to this, and any high copper grade 3 mm under material may be used.

In addition, in the above embodiment, the precipitated copper powder and the powdered coal are mixed in advance, but this is not necessarily the case; instead, they may be stored in separate containers and the mixing ratio may be controlled depending on the situation of the solution. It's okay.

"Example" Next, an experimental example to clarify the above effects will be introduced. In this experimental example, the number of lances to be added is compared between a conventional copper manufacturing method and an experiment 1 and an experiment 2 using the copper manufacturing method of the present invention.

First, the conventional copper manufacturing method is performed using a copper manufacturing furnace 1 under the following conditions.

Cu29.6%, Fe25.4%, S27.9%, _SiO2 9.0%,
The ore prepared in advance to have a composition of 0.5% CaO is dried, charged to a smelting furnace at 30t/h, blown to a grain quality of 66%, passed through a separation furnace, and then transferred to a copper making furnace at 14.3t. /
The copper making furnace was operated with H glue flowing in continuously.

The operating conditions of the copper furnace are as follows.

Glue inflow rate...14.3t/H Glue grade...66% Charged lime amount...1.0t/H Lance air blow rate...7700Nm ³ /H 80% lance oxygen blow rate... ^1400Nm3 /H Total air flow rate …9100Nm ³ /H Number of lances…4 Air flow per lance…2275Nm ³ /H Auxiliary burner oil…110/H Blister copper spillage…8.9t/H Spillage from copper furnace…3.2t/H H On the other hand, Experiment 1 using the copper manufacturing method of the present invention was conducted using the copper manufacturing furnace 2 as follows. Note that description of the same conditions as in the case of the conventional copper manufacturing method described above will be omitted.

First, a precipitated mixture of powdered precipitated copper, which requires 60 g of oil per tonne to dissolve, and 860 kg of powdered coal in a dry state is placed in a pressurized tank. Then, it was operated for 24 hours under the following conditions.

80% oxygen air flow rate... ^1400Nm3 /H Lance air flow rate...7700Nm3/H Amount of charged lime... ^1.0t /H Sedimentation mixture...500Kg/H Auxiliary burner oil...100/H In addition, this Experiment 2 using the copper manufacturing method of the invention was conducted under the same conditions as Experiment 1 above, increasing the amount of the precipitation mixture to 1.0 t, and operating for 24 hours. In addition, the auxiliary burner oil consumed 70/H.

The above experimental results are shown in Table 1.

As is clear from this table, the number of additional lances is significantly reduced in the copper manufacturing method of the present invention compared to the conventional copper manufacturing method. Therefore, the copper manufacturing method of the present invention can significantly reduce the number of times the lance tip is blocked. It can also be seen that the larger the amount of the precipitation mixture, the better the results.

"Effects of the Invention" As explained above, according to the present invention, a high copper grade powder material and a powder granular solid fuel having an amount of heat necessary to melt the high copper grade powder material are By blowing into the copper furnace through the lance, it is possible to prevent deposits from accumulating on the tip of the lance and clogging it.
Therefore, a great deal of effort is required to remove the deposits;
In addition to saving time and effort, there is no need to add lances, and the operating rate of the furnace can be improved.In addition, it is possible to process refrigerants such as high copper grade powder materials at the same time. This has the effect of being able to.

[Brief explanation of the drawing]

1 to 3 are views showing one embodiment of the present invention, in which FIG. 1 is a front view thereof, FIG. 2 is a plan view thereof, and FIG. 3 is an enlarged cross-sectional view of the arrowed part in FIG. 1. 4 and 5 are views showing a conventional copper making furnace, with FIG. 4 being a front view thereof and FIG. 5 being a plan view thereof. 2... Copper making furnace, 13... Solution, 14... Charging lance (lance).

【table】

Claims (1)

[Claims] 1. While introducing the glue produced through the smelting furnace and the separation furnace into the copper making furnace, oxygen-enriched air is fed into the solution in the copper making furnace through the top blowing lance to In the copper manufacturing method, which converts impurities into blister copper by oxidizing and removing impurities, the oxygen-enriched air and the high copper-grade powder material, which is different from the glue, and the high-copper-grade powder material necessary to melt the high-copper grade powder material are used together with the oxygen-enriched air. A copper manufacturing method characterized by blowing a heat amount of powdery solid fuel into a copper manufacturing furnace through the lance.