JPS5950735B2 - How to operate a Ren ``Kan'' furnace - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for operating a smelting furnace, which charges coal into the smelt fireplace to reduce the copper content in the charcoal and reduce power consumption.

In copper smelting, molten karami discharged from a smelting furnace such as a flash smelting furnace is further transferred to an electric furnace called a renhime furnace, where the copper contained in the karami is separated and recovered as sludge.

It is known that in order to reduce the copper content of karami, it is possible to adjust the karami composition, add a reducing agent, lower the copper quality of the karami that coexists with karami, etc. Slag, iron sulfide ore, etc. are charged into the smelting furnace.

However, although the method of charging blast furnace slag and iron sulfide ore to the smelting furnace contributes to lowering the copper content of karami,
A large amount of electricity is consumed to melt these, and therefore, there is a disadvantage that the economic benefit of recovering copper from karami is reduced by the economic disadvantage of increased power consumption.

Therefore, the present inventors discovered that by charging coal instead of blast furnace slag or pyrite, it would be possible to reduce the copper content of karami, recover copper, and reduce power consumption by using the combustion heat of coal. We focused on this and conducted a study in actual operation.

As a result, if we simply charge coal into the Rehime Furnace, the coal will burn due to the oxygen in the air, which will react with the karami and have no effect on lowering the copper content, and the heat of combustion of the coal will consume electricity. It has become clear that even though the purpose was to reduce the volume, the temperature of the exhaust gas in the fireplace was increased unnecessarily, resulting in poor thermal efficiency.

Therefore, we further investigated the operating method of the Renhime Furnace, and as a result, we arrived at the present invention.

Therefore, an object of the present invention is to reduce the copper content of karami in a wrought fireplace, recover copper, and reduce power consumption. The object of the present invention is to operate a rehime furnace by the method described.

That is, instead of directly charging coal into a smelting furnace, the coal and solid slag crushed to a size of 100 mm or less, preferably about 50 mm are mixed in advance before charging, and this mixture is charged.

The reason why coal and solid wood are mixed and charged in this way is to prevent the charged coal from coming into direct contact with air and burning without reacting with the coal, and to wrap the coal in solid wood. It is.

In this case, in order to prevent the coal from heating rapidly and generating intense black smoke at the beginning of charging, if necessary, only a relatively small amount of solid coal may be charged before charging the mixture. You may also leave it in there.

Next, the hard layer is charged so that the mixed layer of coal is completely covered by the hard layer.

As a result, the coal burns at an appropriate combustion speed by suppressing the circulation of air from the surrounding area, and during that time, it reacts with magnetite, etc. in the karami, reducing it and lowering the oxygen potential of the karami. Reduces copper content.

In addition, the combustion heat of coal is transmitted to the Japanese National Railways, etc., and acts effectively as a heat source for melting the coal, so it can be used efficiently.

Next, the method of operating the rehime furnace of the present invention will be explained in more detail with reference to FIG.

1 is a forging furnace, and 2 is an electrode.

3 is a molten karami held in the furnace 1.

Numeral 4 is a coal bin, and 5 is a Japanese National Railways bin, in which coal 6 and National Railway 7 are stored.

Also, feeders 8 and 9 are provided at the outlet of each bottle.
The coal cut from the feeder 8 is placed on the belt conveyor 10HM equipped with a weighing machine, and the coal cut from the feeder 9 is placed on the belt conveyor 11 equipped with a weighing machine. The coal passes through a belt conveyor 12 and is placed on a belt conveyor 11 like coal.

The belt conveyor 11 is designed to convey the loaded material to the furnace bin 13, and a feeder 14 is provided at the outlet of the furnace bin 13, so that the contents of the furnace bin 13 can be cut out to the shuttle conveyor 15. It looks like this.

The shuttle conveyor 15 moves back and forth, and the furnace 1
Loads can be supplied to hoppers 16 and 17 that open toward the inside of the container.

In such equipment, first, the feeders 8 and 9 are operated to cut out a desired amount of coal and JNR at the same time, and the coal and JNR are charged into a furnace bin 13 via a belt conveyor 11.

During this time, coal and JNR are thoroughly mixed.

In this case, if necessary, only the feeder 9 may be operated for a short period of time so that only the JNR is charged into the furnace bin]3.

Next, when the desired amount of coal has been cut out, the feeder 8 is stopped and only the JNR is continuously cut out, with an amount sufficient to cover the layer of the mixture of coal and JNR when it is later charged into the wrought iron. of Japanese National Railways is charged into the furnace bin 13.

In this way, in the furnace bin 13, a mixture of coal and Japanese National Railways is stored in the lower layer, and a desired amount of Japanese National Railways is stored in the upper layer.

The feeder 14 and shuttle conveyor 15 are operated with this as one charge amount, and the hopper 16.1 is first loaded.
If the mixture of coal and JNR is evenly distributed and charged into hoppers 7 and then the solid iron is similarly distributed and charged into hoppers 16 and 17, the mixture of coal and JNR will be placed on top of the column 3 in the wrought iron furnace. The material is then charged, then covered and charged in a "hard-warm" state.

It goes without saying that the above-mentioned charging of coal and Japanese National Railways is carried out intermittently at appropriate time intervals so that the effect of the reduction action in the wire method furnace is not interrupted.

If the Rehime Furnace is operated in the manner described in detail above, the copper content in the karami can be reduced by the reducing action of the coal and copper can be recovered effectively, while the combustion heat of the coal can be reduced. By effectively using the power, it is possible to reduce power consumption, which has a large economic effect.

Example Using the wrought iron furnace equipment shown in Figure 1, a mixture of 300 kg of coal with a grain size of 28 mm and 7 tons of Japanese National Railways with a grain size of 50 mm on average was mixed with a solid! The forge furnace was operated by charging 3 tons of the mixture at one time, charging the mixture into the forge furnace, and then charging only the Japanese National Railways, six times a day.

As a result, compared to the case where blast furnace slag is used as a copper-lowering agent, the copper content of 400 tons/day of karami processed in the forging fireplace was reduced by 0.1% by weight, and the power consumption of the forging furnace was reduced by 13%.
A savings of 940KWH/day was achieved.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of wrought iron furnace equipment for implementing the present invention. 1... Renhime Furnace, 2... Electrode, 4...
...Coal bottle, 5...JNR bottle, 13...
...Furnace bottle, 16,17...Hopper.

Claims (1)

[Claims] 1. A mixture of coal and solid coal is charged into the furnace, and then only the solid coal is charged, so that the coal charged into the furnace is covered with a layer of solid solids. The operating method of Renhime Furnace.