JPS61266527A - Method for recycling water crushed slag generated in nonferrous metal smelting - Google Patents

Abstract

PURPOSE:To recycle water crushed slag without using fuel only for drying, by water treating slag generated at nonferrous metal smelting, then passing and drying it through a chain conveyer for drawing out flue cinder of waste heat boiler in smelting furnace and supplying the slag to smelting process together with flue cinder. CONSTITUTION:To an under part of a waste heat boiler 1, the chain conveyer 2 for drawing out flue cinder generated in the boiler 1 is provided. A slag introducing hole 2a is provided to the tail of the conveyer 2. Slag contg. water which is stored in hopper and dewatered is taken out continuously by a belt conveyer 3, and introduced to the hole 2a. Next, the introduced slag is moved while being exposed to high temp. of the boiler 1, discharged 2b, introduced to a recycling equipment, and returned to the smelting furnace. Consequently, a rotary dryer for drying slag is made unnecessary, further since the heat of the boiler 1 is utilized directly, the use of heavy oil, only for slag dryer is also unnecessary.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The invention relates to a method for recycling %I discharged from a smelting process into a smelting process.

[Conventional technology]

The trowels produced in non-ferrous metal smelting contain a considerable amount of the target poor metal, which is usually recycled into the smelting process to recover the metal.

Now, we will explain steel smelting as a representative example. The steel smelting process is
The furnace shown in Figure 8g5 consists of a smelting furnace, a separation furnace, and a steelmaking furnace. and a steamed rice cake is generated. After a long time, these are separated into two layers by a 70% difference in a separation furnace, the upper layer of sulfur is discarded, and the lower layer of sulfur is sent to a steelmaking furnace. In the steelmaking furnace, solvent is added again and air is blown into the steelmaking furnace to produce crude steel and steelmaking. It is crushed and recycled into the smelting furnace.

In addition, the gas discharged from the separation furnace and steelmaking furnace is introduced into a waste heat boiler and the waste heat is recovered.

After the smoke ash is removed, it is sent to a sulfuric acid factory and the SO contained therein is
2 is effectively utilized, and the removed smoke ash is recycled to the smelting furnace along with Wangji Steelmaking.

In the above-mentioned recycling process, if the pulverized steel trowel (hereinafter referred to as trowel) is wet, it may cause problems such as clogging of the feed system chute to the still furnace. There are concerns that this may lead to

Therefore, conventionally, the pulverized water is temporarily stored in a hopper, the recycling route of which is shown in FIG. 5, and drained to reduce the water content to about 3 parts. The drained eel is taken out one after another and dried using a rotary dryer. The dried material is discharged from the rotary dryer area at a temperature of 70 to 80°C, and is received by a belt conveyor and transported to a recycling facility.

[Problem to be solved by the invention]

By the way, when drying with the above-mentioned rotary dryer is performed, for example, when the generation rate of the iron is 12 to 3 T/hour, the electric oil is 0.6 to 1
．． Not only is OkJ/day required.

This is because the temperature of the rotary dryer discharged from the rotary dryer is high. -The belt of the belt conveyor that receives and transports the food is subject to severe wear and tear, and has to be replaced every 2 to 3 months.

In view of the above-mentioned 4I circumstances, the present invention aims to provide a method for recycling water granules that does not use fuel only for drying and does not cause wear and tear on the equipment.

[Means to resolve the problem]

The present invention has been made to achieve the above objectives,
Is the method a crushed bell? In this method, ash is supplied to the tail of a chain conveyor for extracting ash from a waste heat boiler, moved along with the ash inside the boiler, dried, and then recycled to the smelting process using recycling equipment.

[Specific purchase and operation of the invention]

The following description will be made with reference to non-inventive drawings.

Figure @1 and Figure 'j42 show an example of a steel smelting apparatus and flow in which the uninvented method is implemented, and the reference numeral 1 in the figures is a waste heat boiler. A chain conveyor 2 is provided at the bottom of the waste heat boiler 1 for extracting smoke generated within the boiler to the outside. A bell inlet 2a' is provided at the tail of the chain conveyor 2, and the water-containing sea urchin is stored in a hopper and drained as shown in the flow shown in Fig. 2a. The introduced sludge moves along with the smoke ash while being exposed to the high temperature of the boiler, is discharged from the discharge port 2b, is introduced into the recycling equipment, and is returned to the '1# furnace. Therefore, −? There is no need for a rotary dryer for drying, and the heat from the waste heat boiler is directly used.
Takadomari is not used only for fa drying. In addition, smoke ash is powder-like, as shown in Figure 3, and because of its hygroscopic properties, it tends to harden easily, causing clogging of the chain case and extraction chute, or clogging of the screen that separates the lumps. As shown in Figure 4, which shows the total content of particles with a given particle size, Suizakuhime has a much coarser particle size than smoke ash (by mixing it with smoke ash, it is possible to sprinkle smoke ash on the water ash). The problem caused by the group closure described above is resolved.

Hereinafter, the invention will be explained in more detail by showing examples.

〔Example〕

1! ! #jA steelmaking furnace The water from the steelmaking furnace is discharged at a rate of 2 to 3'r/hour, and the water is crushed and stored in a hopper. This crushed water is drained in a hopper and has a water content of 3wt. This was extracted continuously at a speed of about 2T/hour, and 4m/f
There were 4 people on the tail 2aK of chain conveyor 2 moving at + speed. In the gay 2-, the 1100'e smelting exhaust gas cools down to 600°C at the outlet, and the chain conveyor 2 is exposed to the outlet gas at this reduced temperature. Also.

Inside the boiler, 200~aooky/hour of smoke is generated and is continuously extracted by the chain conveyor 2. The water content introduced through the inlet 2a is dried while being moved on the chain conveyor 2 while being exposed to the outlet gas of the waste heat boiler, and becomes 0.5 to 0.5 wt% of moisture, and the water content is removed from the outlet along with smoke ash. 2b is discharged and introduced into recycling equipment.

In this case, the temperature of the extracted drying material was about 45°C, and it was not possible to operate it for a long period of time. However, no closure of the yarn path occurred.

The degree of dryness was freely adjusted by changing the running speed of the chain conveyor. Distributions that occur with a large number of target-poor kI4 items can also be processed in the same month.

〔effect〕

As described above, the method according to the present invention is intended only for drying granulated water, does not require two devices or fuel, and furthermore, it uses fine powder and hygroscopic smoke ash to close the yarn path.
Don't get rid of it, M's many strengths.

[Brief explanation of drawings]

Figures 1 and 2 show an example of a steel refining device implementing the method of the present invention; Figure 11 shows a chain conveyor at the bottom of the waste heat boiler for drying ice crushers; Is diagram 2 a flow? Figure 3 shows the particle size of smoke ash,
FIG. 4 is a diagram showing the proportion of large YIA in a predetermined grain size of loose water granulation, and FIG. 5 is a diagram showing the flow of a conventional steel smelting method. Engineering... Waste heat boiler, 2°°°°... Chain conveyor, 2a... Water crusher A4 population, 2t3...
...Discharge port, 3...Belt conveyor.

Claims (1)

[Claims] In a method of pulverizing ■ generated during the smelting of nonferrous metals and recycling it to the smelting process, the pulverized ■ is dried by passing it through a chain conveyor for extracting smoke ash from the waste heat boiler of the smelting furnace. A method for recycling fracked water generated in non-ferrous metal smelting, which is characterized by recycling it together with smoke and ash into the smelting process.