JPH0125817B2 - - Google Patents

Description

[Detailed description of the invention] The present invention deals with dust generated in iron manufacturing and steel manufacturing processes,
A device that efficiently performs a series of treatments such as recovering useful metals such as Zn from slag by utilizing the sensible heat of steelmaking slag, and fixing the remaining harmful components in the slag. It is related to.

For example, in electric furnace operation, although there are slight variations depending on the raw materials used, approximately 1 to 2% of the raw materials used are
Dust (same below weight percent) is generated from the dust collector, and this dust contains lead oxide, cadmium oxide, zinc oxide, etc., and if these contents are large, it may cause a pollution problem. However, since there is no complete dust treatment equipment, the cost of dust treatment can have a significant impact on the product price. And this kind of thing is not limited to dust from electric furnaces, but also applies to other dust and sludge generated at steelworks.

Therefore, the present invention aims to provide an apparatus for effectively treating dust and sludge that still contain these useful metals.
An agglomeration device for forming sludge into agglomerates of a desired size, a calciner for calcining the agglomerates sent out from the agglomeration device, and a calcined product sent out from the calciner. In the airtight room, there is a slag ladle that receives the slag and steel slag, an airtight room that stores the slag ladle so that it can be accessed and removed,
This is a dust and sludge processing device consisting of a combination of a bubbling gas supply device for promoting the reaction between the calcined material and steel slag, and a dust collector that collects volatile matter from the airtight chamber and the calcining furnace. If the steel slag used is collapsible, such as converter slag, it can be used to prevent disintegration or as a modifier to accelerate the reaction between the slag and dust or sludge mixture (by lowering the melting point), and to reduce the product. A disintegration prevention and reaction accelerator consisting of at least one member selected from red mud, slate, shale, various types of karami, sandstone, masa soil, foundry waste sand, and coal ash, which reduces the disintegration as much as possible after solidification. Sometimes a hopper is provided for insertion.

The apparatus of the present invention will be described in detail below with reference to the drawings showing one embodiment. In the drawings, 1 is a pelletizer;
2 is a briquette machine which granulates or briquettes the dust collected during electric furnace operation and, if necessary, adds coke powder, etc., and puts it into the hopper 3. 4 is lined with castable in a calcining furnace, and if necessary, the cylindrical object can be fully opened so that the castable can be easily relined, and the bottom is made of steel or lining so that the molded briquettes etc. do not get wet. A steel bar is stretched, coke or charcoal is placed on top of it, the upper cover is moved, the belt conveyor 5 is driven, the formed briquettes are put in, and the coke, etc. is removed from the lowermost steel or steel bar wall using a gas burner. After igniting and operating the motor of dust collector 6,
Open the damper 7, ignite the briquettes, etc., and calcinate them sequentially from the bottom. When the fire reaches the top, stop the damper 7, open the lower part of the calciner, and pour the briquettes into the calcined material hopper 8. Drops about 1/2 of the ore, etc.

On the other hand, the steelmaking slag is placed in a slag pot 10 placed on a sliding cart 9 and introduced into an airtight chamber 11, and the flow rate and pressure are adjusted by a bubbling gas (O ₂ , N ₂ , air, etc.) control device 12. Then, bubbling gas is blown into the mixture of slag and calcined material from the lance pipe to stir it. At this time, the disintegration prevention and reaction accelerator may be supplied from the hopper 13. In this way, volatile metals such as Zn and Pb accumulate in the airtight chamber 11, so the damper 14 is opened and the cyclone 15 and dust collector 16 collect the dust. In addition, the addition of calcined dust briquettes, etc., is stopped until the molten diffusion reaction in the molten slag has finished, and when the volatilization of Zn, Pb, etc. has stopped, they are taken out of the processing chamber and cooled, and then crushed and magnetically separated. It is treated and used for roadbed materials, etc.

In addition, the recovered volatilized crude zinc is used as a raw material for galvanizing, but if the content of coke, etc. in dust briquettes increases, CO gas is generated when it is introduced into molten slag, causing a homing phenomenon and leaving it as it is. If you put it in, it will overflow from the slag pot and you can only process a small amount.

In addition, when briquettes are processed in a calcining furnace, about 50% of volatile matter is
% is collected by the dust collector 16, and most of the reducing substances such as coke are digested as energy, so
Since there is little CO gas generation, there is almost no forming phenomenon, so continuous feeding processing is possible, and since it is calcined and red-hot, there is less heat consumption, and it is better than processing briquettes etc. at room temperature. It can process large quantities and is effective for processing dust briquettes, etc. If the Zn content in electric furnace dust or sludge is low and there is little merit in collecting it without improving the Zn quality of the volatile matter, use an existing discount dust collector or environmental dust collector together. It's okay.

According to the present invention, as configured as described above, the large amount of energy possessed by steelmaking slag can be used effectively and efficiently. It is possible to input it as a fuel or to treat it as a red-hot dust briquette, etc., and it is possible to save energy and perform efficient processing.

[Brief explanation of drawings]

The drawing is a schematic explanatory diagram of the device of the present invention.

Claims (1)

[Scope of Claims] 1. An agglomeration device for forming dust and sludge into agglomerates of a desired size, and a calcining furnace for calcining the agglomerates sent out from the agglomeration device. A slag ladle that receives the calcined material and the steelmaking slag sent out from the calcining furnace, an airtight room that stores the slag pot so that it can be taken in and out, and a reaction between the calcined material and the steelmaking slag in the airtight chamber. A dust and sludge processing device comprising a combination of a bubbling gas supply device for acceleration and a dust collector that collects volatile matter from the airtight chamber and the calciner. 2. An agglomeration device for forming dust and sludge into agglomerates of a desired size, a calcination furnace for calcining the agglomerates sent out from the agglomeration device, and a calcination furnace for calcining the agglomerates sent out from the calcination furnace. A slag ladle that receives the calcined material, the steel slag, and a disintegration prevention/reaction accelerator, an airtight chamber that stores the slag ladle so that it can be accessed and removed, and a reaction between the calcined material and the steel slag in the airtight chamber. A processing device for dust and sludge comprising a combination of a bubbling supply device for promoting oxidation and a dust collector for collecting volatile matter from the airtight chamber and the calcining furnace.