JPS59166639A - Heat recovery method and apparatus in zinc refining installation - Google Patents

Abstract

PURPOSE:To enhance the heat efficiency in a Zn-refining process, by heating a Zn sintered ore by utilizing the heat of the waste ore discharged from the electric heating distillation furnace in Zn-refining installation. CONSTITUTION:The coke preheated to about 800 deg.C in a coke preheating furnace 2 is put in a bin 4 while a Zn sintered ore heated to about 1,000 deg.C in preheating installation 3 is stored in a bin 5 at once. The high temp. sintered ore and the coke as a reducing agent are charged into an electric heating distillation furnace 1 from the bins 4, 5 and heated to 1,000 deg.C or more by electric heating to reduce the Zn-compound in the sintered ore to metal Zn which is, in turn, further introduced into a condenser 6 as Zn-vapor to be converted to solid Zn. The waste ore with a temp. of 1,000 deg.C or more discharged from the distillation furnace 1 heats the air from a fan 9 to about 650 deg.C in a waste ore cooling installation 7. This high temp. air is sent to a preheated gas generating furnace 8 to burn fuel and the generated high temp. gas is fed to the sintered ore preheating installation 3 to preheat the Zn sintered ore.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention recovers the heat of Konaji zinc waste discharged from an electric distillation furnace (N-air furnace) in a zinc smelting facility and uses it to preheat sintered ore. This relates to a heat recovery method and equipment in a zinc smelting facility that uses V strained zinc.

Among the zinc smelting equipment, the distillation method uses sintered ore, reducing agent, and coke from L~ in a bottle (
After mixing the sintered ore and coke from a) and (b) into a preheating furnace (c) and preheating the mixture, transfer to an electric distillation furnace (d).
The zinc is heated to about 1,000°C, and the zinc is taken out from the distillation furnace (d) in vapor form. [7, Distillation lfi, to obtain lead I~, -power, the discharged ore that was not galvanized in the electric distillation furnace (d) was heated to about 1000℃.
The distillation furnace (d) is then discharged to the outside.

In conventional zinc smelting equipment, waste ore (including coke) discharged from a two-distribution thermal distillation furnace at about 1000°C is cooled with water in a water cooling device (f) to reduce waste ore to about 700°C and -1
After cooling naturally, the coke is collected into the bin (b).
~, a part of the discharged ore is sintered in a sintering machine (g) so that it can be collected in a bin (a) (c (7)).

However, in the conventional method, when waste ore with a high temperature of about IDDO°C is discharged from the distillation furnace (d), it is cooled with water or allowed to cool naturally, so that heat is not wasted and energy is not wasted. Nso.

In addition to the water cooling and natural cooling methods mentioned above, conventional methods include
One method is to install a cooling facility and exchange heat between the waste ore and the cooling air within the cooling facility, and the high-temperature scum is dissipated into the atmosphere or sent to other facilities, or the high-temperature gas is guided to a waste heat boiler. A method of recovering heat as steam was also being adopted.

1 or 1, the former method had the drawbacks of not being able to save energy at all, and the latter method being unsuitable for plants that do not require steam and requiring high equipment costs.

The present invention has been made to utilize the heat of high-temperature discharged ore for preheating sintered ore, thereby saving energy and making effective use of heat.

Embodiments of the present invention will be explained below with reference to the drawings.

The second one is a 111i lead j11! using the device of the present invention.
This shows an overview of the 1-hole equipment, including an electric distillation furnace (electric furnace) (
The preheating furnace for preheating the sintered ore to be charged to 1) and the coke from 1 to 1 is divided into a coke preheating furnace (2) and a sintered ore preheating equipment (3). and preheating equipment (3)
The sintered ore and coke, which were preheated separately in the Pino F41
, f5) and then heated and charged into the electric distillation furnace (1), and the 4F lead heated and wandered in the distillation furnace (1) is converted into a vapor state as in the conventional method shown in Fig. 1. The zinc is taken out at a temperature of 1000 mL, and is led to a condenser (6) where it is quenched and obtained as distilled zinc.

The apparatus of the present invention is such that the heat of the waste ore that has been zincized in the electric distillation furnace (1) and discharged from the distillation furnace (1) can be used for preheating the sintered ore. As shown in the frame of two-dot chain line 1 in Fig. 2 and as shown in detail in Fig. 3, the sintered ore preheating equipment (3), the discharged ore cooling equipment (7), and the preheating gas generating furnace (8) are included. The waste ore discharged from the distillation furnace (1) is guided to the waste ore cooling equipment (7) where it is exchanged with cooling air, and the high temperature air is sent to the preheating gas generator (8). The sintered ore is heated to an even higher temperature by burning the fuel, and this high-temperature gas is led to the sintered ore preheating equipment (3) to preheat the sintered ore.

(9) is a cooling air fan that pushes approximately 20℃ cooling air into the discharged ore cooling equipment (7), and 00 is the sintered ore preheating equipment (
This is an exhaust fan that sucks in approximately 300°C exhaust from the air conditioner (3) and releases it into the atmosphere through the dust collector (01). The exhaust gas from 3) is sucked in by the exhaust fan 00) so that the pressure inside the towers of both equipment +7+ and (31) can be controlled to be below a certain level. The pressure control valve 03) is installed on the suction side of the cooling air fan (9) in order to keep the pressure in the cooling equipment (7) constant by operating accordingly. 3) A pressure control valve is installed on the suction side of the exhaust fan 00) to operate according to the pressure inside the preheating equipment (3) and keep the pressure inside the preheating equipment (3) constant. 7)
There is a pipe line that guides the hot air that enters the preheating gas generating furnace (8) through the dust remover (25) as combustion air to the preheating gas generating furnace (8), or the remainder of the hot air is sent to the preheating gas generating furnace (8). This is a pipe that leads to the preheating gas generator (8) so that it can be used with dilution air to lower the gas concentration after combustion, and pipe Q4). θG) or the father pipe (15) is equipped with a dilution air control valve 07). 081 is a conduit for supplying fuel to the preheating gas generating furnace (8), and a fuel control valve Q9) is provided in the middle. (2
0) is a combustion air fan that pushes combustion air to the preheating gas generating furnace (8), and 1) is a pipe line that has an air control valve (22) in the middle and leads the combustion air to the preheating gas generating furnace (8). It is.

As shown in Figure 2, the discharged ore cooled in the discharged ore cooling equipment (7) is separated into fine sintered ore and coke, and the fine sintered ore is collected and sent to the sintering machine. The coke is recovered and returned to the coke preheating furnace (2). Shi3I
This allows the sintering machine to be replenished with sintered ore. (2
a is make-up coke.

Since the present invention has the above configuration, an electric distillation furnace (
The waste ore discharged at high temperature (approximately 1000° C.) without being zincized in step 1) is charged to the waste ore cooling equipment (7). The high-temperature waste ore charged into the cooling equipment (7) undergoes heat exchange within the waste ore cooling equipment (7) with normal temperature air sucked from the atmosphere by the cooling air fan (9). The temperature of the discharged ore is approximately 400℃
After being discharged from the cooling equipment (7), the fine sintered ore is divided into fine sintered ore and coke, and the fine sintered ore is led to the sintered ore preheating equipment (3) through sinter P9 (231). , the coke is led to the coke preheating furnace (2) and recycled.

- The exhaust cooling equipment (7) removes heat from the high-temperature exhaust ore, and the hot air (approximately 650°C) is sent to the preheated gas generator (8) through the Preheating gas generating furnace (8
A portion of the hot air entering the combustion chamber is used as combustion air, and the remaining hot air is used as dilution air to lower the gas temperature after combustion in the preheating gas generator (8). In the preheating gas generating furnace (8), fuel is supplied through the pipe (18), so this fuel is combusted with the hot air, and the high temperature gas (approximately 1000°C) obtained by this force is used to preheat the sintered ore. Equipment (3)
The sintered ore is sent to the sintered ore preheating equipment (3). Ru. Preheat the sintering plate to a constant temperature (about 800°C) at about 50°C. At this time, the sintered ore preheated in the sintered ore preheating equipment (3) is discharged at a certain temperature + summer < about 800℃).
/i: Is it necessary to control the temperature and flow rate of the preheating gas coming out of the preheating gas generator (8)? In this case,
The splint I, combustion air, and dilution air entering the preheating gas generator (8) are connected to the conduit (18) +' Q41,
Fuel control pallet installed in Q5): lq),
ts baking 2 [:ff 7 ) Rollharz (16), by adjusting the dilution air control valve αη automatically or manually.

Further, the preheating gas generating furnace (8) is equipped with a combustion air fan (1) so that combustion air can be sent from a combustion air fan (20).This combustion air fan (20) is used under the following conditions.

■ The waste ore charged to the waste ore cooling equipment (7) is
7) Reacts with 02 in the air (17), and is used to replenish 02 in the preheating gas generating furnace (8) when 02 in the recovered hot air is zero or insufficient. Conversely, if there is no reaction (only heat exchange) in the cooling equipment (power furnace), the combustion air fan (20
) is unpleasant.

■ It is used to increase the slag quality when the amount of recovered hot air that has passed through the exhaust cooling equipment (7) is insufficient to the amount of scum required by the sintering preheating equipment.

■ Used when the sintered ore preheating equipment (3) must be operated even if the exhaust ore cooling equipment (7) is out of order (7) and there is no recovered hot air.

The sintered ore preheating equipment (3) heats sintering to a certain temperature (approximately 8
The exhaust gas Id used for preheating at 00°C is sucked in by an exhaust fan (10) and turned into clean gas through a dust collector (type of dust collector), which is then discharged to the atmosphere.

As described above, according to the present invention, the heat of high-temperature waste ore discharged without being zincized in the zinc smelting equipment is recovered (1), and after the heat is further raised to a higher temperature, the heat is Since it is used to preheat the sintered ore, the heat of the high-temperature discharged ore can be used effectively, and another heat ffQ can be used to preheat the sintered ore.
can be omitted, energy saving can be achieved, and along with this, energy saving of other equipment and productivity improvement of other equipment can also be achieved. Furthermore, by providing an exhaust fan on the exit side of the process and dissipating the exhaust gas into the atmosphere to maintain a constant pressure level in each facility, it is possible to stabilize the system.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram of a distillation method in conventional zinc smelting equipment, Figure 2 is a schematic diagram of a distillation method zinc smelting equipment equipped with the apparatus of the present invention, and Figure 6 is an implementation of the apparatus of the present invention. FIG. 2 is a schematic diagram illustrating an example. (1)...Electric distillation furnace, (3)...Sintered ore preheating equipment, (
Crab - Exhaust ore cooling equipment, (8)・Preheating gas generator, (9
)...Cooling air fan, θ0)...Exhaust fan. Figure 2 Procedures Amendment (Voluntary) December 1981
September 9, Mr. Kazuo Wakasugi, Commissioner of the Japan Patent Office, Indication of the case 1982 Patent Application No. 37892 2 Name of the invention 3 Heat recovery method and device in zinc smelting equipment 3 Person making amendments Patent applicant Port of Tokyo Japan Mining Co., Ltd., 2-10-1 Toranomon, Ward
(Name) 4. Agent 3-5-3 Uchikanda, Chiyoda-ku, Tokyo Subject of amendment (1) The amended appendix in the scope of claims column of the specification is as follows. (If) Correction of drawings Figures 1, 2, and 3 shall be corrected as shown in the attached sheet. 7 List of supporting documents (1) One document stating the amended scope of claims (2) Drawings One document Claims [Zinc smelting is characterized by cooling the discharged ore through heat exchange with air, burning fuel with the heated air, and preheating sintered ore with the resulting high-temperature residue.] Heat recovery method in equipment. 2) An ore cooling facility is installed to exchange heat between the discharged ore discharged without being zincized from the electrothermal distillation furnace of the zinc smelting facility and air; A preheated gas generating furnace is provided to burn the firing material with the hot air, and the gas heated to high temperature in the preheated gas generating furnace is guided to the sintering furnace for sintering. A heat recovery device for a zinc smelting facility, characterized in that the 1-Y gas can be used to preheat ore, and the 1-Y gas used to preheat the sintered ore in the sintered ore preheating facility is released to the atmosphere. =199

Claims (1)

[Claims] 1) Exhaust ore discharged after being galvanized in an electric distillation furnace of a zinc smelting facility is cooled by heat exchange with air, and the heated air is used to generate fuel. A heat recovery method in a zinc smelting plant fi, which is characterized by preheating sintered ore with the high-temperature residue obtained by combustion. 2) Install a waste ore cooling equipment that exchanges heat with air and the waste ore that is zincized and discharged without +1 in the electric distillation furnace of the zinc smelting equipment, and take in the hot air taken out from the waste ore cooling equipment. A preheating gas generating furnace is installed so that the fuel is combusted with the hot air, and the high temperature gas in the preheating gas generating furnace is guided to the sintered ore preheating equipment to preheat the sintered ore. A heat recovery device for a zinc smelting facility (C), characterized in that it can be used for sintering, and the exhaust gas used for preheating sintered ore in the sintered ore preheating facility is released into the atmosphere.