阅读说明：本技术 一种将含锌粉料飞行熔融生产直接法氧化锌的设备 (Equipment for producing direct method zinc oxide by flying and melting zinc-containing powder ) 是由 陈志伟 于 2020-12-06 设计创作，主要内容包括：本发明公开了一种将含锌粉料飞行熔融生产直接法氧化锌的设备,属于直接法氧化锌生产技术领域。目前直接法氧化锌生产设备主要有韦氏炉、回转窑和隧道窑,这几种设备存在能耗高、转化率低等问题,本发明利用旋风炉的旋风作用将含锌粉料在飞行状态下熔融,在高温还原气体中,传热传质效率非常高,含锌粉料中含有的锌元素迅速还原挥发为金属锌蒸气,粉状熔渣粘在旋风炉炉壁上并从排液口输出,净化后的含有锌蒸气的高温气体被气体冷确设备冷确,锌蒸气在冷确过程中被气体中的CO_2或氧气氧化为氧化锌,在收尘设备中收集,获得高品质的氧化锌。(The invention discloses equipment for producing direct method zinc oxide by flying and melting zinc-containing powder, and belongs to the technical field of direct method zinc oxide production. The present invention utilizes the cyclone action of cyclone furnace to melt zinc-containing powder material in flight state, and in the high-temp. reducing gas the heat-transfer and mass-transfer efficiency is very high, the zinc element contained in the zinc-containing powder material can be quickly reduced and volatilized into metal zinc vapour, the powdered slag is stuck on the wall of cyclone furnace and can be discharged from liquid outlet, the purified high-temp. gas containing zinc vapour is cooled by gas cooling equipment, and the zinc vapour is cooled by CO in the gas in the cooling process 2 Or oxidizing the oxygen into zinc oxide, and collecting the zinc oxide in dust collection equipment to obtain high-quality zinc oxide.)

1. The equipment for producing direct method zinc oxide by flying and melting zinc-containing powder comprises a cyclone furnace, oxygen-containing gas input equipment, gas cooling and determining equipment and dust collecting equipment, and is characterized in that: the cyclone furnace comprises powder feeding equipment, a powder feeding pipeline, an air inlet, an air outlet, a feeding hole and a furnace wall; the powder feeding pipeline comprises an outlet end and an inlet end, the outlet end is connected with the feeding port, and the inlet end is connected with the powder feeding equipment; the oxygen-containing gas input equipment is connected with the gas inlet channel, the gas inlet channel is connected with the gas inlet, the gas outlet channel is connected with the gas outlet channel, the gas outlet channel is connected with the gas cooling equipment, and the gas cooling equipment is connected with the dust collecting equipment.

2. The equipment for producing direct method zinc oxide by flying and melting zinc-containing powder according to claim 1 is characterized in that: the gas cooling device is a heat exchanger; the heat exchanger comprises an oxygen-containing gas inlet, a preheated gas outlet, a high-temperature waste gas inlet and a cold waste gas outlet; the oxygen-containing gas input equipment is connected with the gas inlet channel through the heat exchanger, the oxygen-containing gas input equipment is connected with the oxygen-containing gas inlet, and the preheated gas outlet is connected with the gas inlet channel; the air outlet channel is connected with the high-temperature waste gas inlet, and the cold waste gas outlet is connected with dust collecting equipment.

3. The equipment for producing direct method zinc oxide by flying and melting zinc-containing powder according to claim 2 is characterized in that: the heat exchanger is a regenerative heat exchanger; the regenerative heat exchanger comprises two regenerative chambers; one of the two regenerators is used for preheating the oxygen-containing gas, and the other regenerator is used for cooling the high-temperature exhaust gas; the oxygen-containing gas inlet and the preheated gas outlet are positioned in the regenerative chamber for preheating the oxygen-containing gas, and the high-temperature waste gas inlet and the cold-confirmation waste gas outlet are positioned in the regenerative chamber for cold-confirmation of the high-temperature waste gas; the preheated gas outlet is connected with the gas outlet channel through a closed high-temperature waste gas reversing gate plate; the high-temperature waste gas inlet is connected with the gas outlet channel through the high-temperature waste gas reversing flashboard in an open state; the preheated gas outlet is connected with the gas inlet channel through a preheated gas outlet reversing flashboard in an open state; the high-temperature waste gas inlet is connected with the gas inlet channel through the preheating gas outlet reversing flashboard in a closed state; the oxygen-containing gas inlet is connected with dust collection equipment through a cold waste gas reversing flashboard in a closed state; the cold waste gas outlet is connected with dust collection equipment through a cold waste gas reversing flashboard in an open state; the oxygen-containing gas inlet is connected with the oxygen-containing gas input equipment through the air inlet reversing flashboard in an open state; the cold waste gas outlet is connected with the oxygen-containing gas input device through the inlet reversing flashboard in a closed state.

4. The equipment for producing direct method zinc oxide by flying and melting zinc-containing powder according to claim 2 is characterized in that: the heat exchanger is a regenerative heat exchanger; the regenerative heat exchanger comprises two regenerative chambers; one of the two regenerators is used for preheating the oxygen-containing gas, and the other regenerator is used for cooling the high-temperature exhaust gas; the oxygen-containing gas inlet and the preheated gas outlet are positioned in the regenerative chamber for preheating the oxygen-containing gas, and the high-temperature waste gas inlet and the cold-confirmation waste gas outlet are positioned in the regenerative chamber for cold-confirmation of the high-temperature waste gas; the oxygen-containing gas input device is connected with the oxygen-containing gas inlet through the air inlet reversing flashboard in an open state and is connected with the cold waste gas outlet through the air inlet reversing flashboard in a closed state; the dust collecting equipment is connected with the oxygen-containing gas inlet through the cold waste gas reversing gate in a closed state and is connected with the cold waste gas outlet through the cold waste gas reversing gate in an open state; the cyclone furnace further comprises a fuel inlet; the air inlet channel is connected with an air inlet of one cyclone furnace, a powder feeding device and a fuel inlet of the cyclone furnace are in a feeding state, an air outlet of the cyclone furnace is connected with an air inlet of the other cyclone furnace, a powder feeding device and a fuel inlet of the other cyclone furnace are in a feeding stopping state, and an air outlet of the other cyclone furnace is connected with an air outlet channel.

5. The equipment for producing direct method zinc oxide by flying and melting zinc-containing powder according to claim 4 is characterized in that: the fuel inlet is arranged on the powder feeding pipeline or near the powder feeding hole; the fuel input port is connected with a fuel flow regulation control device; the high-temperature waste gas inlet and the preheated gas outlet are respectively connected with the oxidized gas input device through the oxidized gas reversing gate plate, the oxidized gas reversing gate plate connected with the preheated gas outlet is in a closed state, and the oxidized gas reversing gate plate connected with the high-temperature waste gas inlet is in an open state.

6. The equipment for producing direct method zinc oxide by flying and melting zinc-containing powder according to any one of claims 1 to 4, characterized in that: and the air outlet channel is connected with an aerobic gas input device.

7. The equipment for producing direct method zinc oxide by flying and melting zinc-containing powder according to claim 3 or 4, characterized in that: a vent pipeline is arranged between the preheated gas outlet and the high-temperature waste gas inlet for connection; and the air pipe is provided with a gas flow regulating valve.

8. The equipment for producing direct method zinc oxide by flying and melting zinc-containing powder according to any one of claims 1 to 5, characterized in that: the air outlet channel comprises an air inlet and an air outlet, the inner space of the air outlet channel is basically cylindrical, and the air inlet and the air outlet are respectively positioned near two ends of the inner space and are in tangential connection with the inner space; the air outlet is connected with the air inlet, and the air outlet is connected with the air cooling and ensuring equipment.

9. The equipment for producing direct method zinc oxide by flying and melting zinc-containing powder according to any one of claims 1 to 5, characterized in that: the equipment for producing direct method zinc oxide by flying and melting zinc-containing powder also comprises a liquid discharge port; the liquid outlet is positioned at or near the bottom of the cyclone furnace; the hearth of the cyclone furnace is basically cylindrical, and the air inlet and the air outlet are respectively positioned near two ends of the cylindrical hearth and are in tangential connection with the cylindrical hearth; the feed inlet is located substantially in the center of the top of the cylindrical furnace.

10. The equipment for producing direct method zinc oxide by flying and melting zinc-containing powder according to any one of claims 1 to 5, characterized in that: the powder feeding equipment is used for inputting zinc-containing powder into a feeding hole through a powder feeding pipeline; the zinc-containing powder comprises one of or the optional combination of more than two of powdery zinc calcine, zinc-containing furnace dust generated by blast furnace iron making, zinc-containing smoke dust generated by steel making and waste slag generated by blast furnace zinc making.

Technical Field

The invention belongs to the technical field of direct method zinc oxide production, and particularly relates to equipment for producing direct method zinc oxide by flying and melting zinc-containing powder.

Background

At present, equipment for producing direct method zinc oxide mainly comprises a Vickers furnace, a rotary kiln and a tunnel kiln, and the equipment has the problems of high energy consumption, low conversion rate and the like. The invention discloses a device and a method for producing direct zinc oxide by a novel tunnel kiln in a grading manner, which is an improvement compared with the traditional Webster kiln and a rotary kiln, but the invention has the advantages that coal-fired dust, pellet flying dust and the like are mixed into the produced zinc oxide products at two ends of the tunnel kiln, primary and secondary products containing more impurities are produced at two ends of the tunnel kiln, only high-grade products containing less impurities are produced at the middle section of the tunnel kiln, the high-grade products cannot be completely converted into high-grade zinc oxide products containing less impurities, the combustion of coal is utilized in the tunnel kiln in a layer combustion manner, the energy utilization efficiency is low, the reduction efficiency of zinc-containing pellets is low, more than 3 percent of zinc is usually contained in waste slag, and the zinc is not fully utilized.

Disclosure of Invention

In order to solve the problems, the invention provides equipment for producing direct method zinc oxide by flying and melting zinc-containing powder, which comprises a cyclone furnace, oxygen-containing gas input equipment, gas cooling and determining equipment and dust collecting equipment; the cyclone furnace comprises powder feeding equipment, a powder feeding pipeline, an air inlet, an air outlet, a feeding hole and a furnace wall; the powder feeding pipeline comprises an outlet end and an inlet end, the outlet end is connected with the feeding port, and the inlet end is connected with the powder feeding equipment; the oxygen-containing gas input equipment is connected with the gas inlet channel, the gas inlet channel is connected with the gas inlet, the gas outlet channel is connected with the gas outlet channel, the gas outlet channel is connected with the gas cooling equipment, and the gas cooling equipment is connected with the dust collecting equipment.

The cyclone furnace further comprises a fuel inlet; the fuel inlet is arranged on the powder feeding pipeline or near the powder feeding hole; the fuel input port is connected with a fuel flow regulating and controlling device.

The hearth of the cyclone furnace is basically cylindrical, and the air inlet and the air outlet are respectively positioned near two ends of the cylindrical hearth and are in tangential connection with the cylindrical hearth; the feed inlet is located substantially in the center of the top of the cylindrical furnace.

The device for producing direct method zinc oxide by flying and melting zinc-containing powder also comprises a liquid discharge port; the liquid discharge port is located at or near the bottom of the cyclone furnace.

The air outlet channel comprises an air inlet and an air outlet, the inner space of the air outlet channel is basically cylindrical, and the air inlet and the air outlet are respectively positioned near two ends of the inner space and are in tangential connection with the inner space; the air outlet is connected with the air inlet, and the air outlet is connected with the air cooling and ensuring equipment.

As an improvement of equipment for producing direct method zinc oxide by flying and melting zinc-containing powder, the gas cooling equipment uses a heat exchanger; the heat exchanger comprises an oxygen-containing gas inlet, a preheated gas outlet, a high-temperature waste gas inlet and a cold waste gas outlet; the oxygen-containing gas input equipment is connected with the gas inlet channel through the heat exchanger, the oxygen-containing gas input equipment is connected with the oxygen-containing gas inlet, and the preheated gas outlet is connected with the gas inlet channel; the air outlet channel is connected with the high-temperature waste gas inlet, and the cold waste gas outlet is connected with dust collecting equipment.

As an improvement of equipment for producing direct method zinc oxide by flying and melting zinc-containing powder, the heat exchanger uses a regenerative heat exchanger; the heat accumulating type heat exchanger comprises two heat accumulating chambers; one of the two regenerators is used for preheating the oxygen-containing gas, and the other regenerator is used for cooling the high-temperature exhaust gas; the oxygen-containing gas inlet and the preheated gas outlet are positioned in the regenerative chamber for preheating the oxygen-containing gas, and the high-temperature waste gas inlet and the cold-confirmation waste gas outlet are positioned in the regenerative chamber for cold-confirmation of the high-temperature waste gas; the preheated gas outlet is connected with the gas outlet channel through a closed high-temperature waste gas reversing gate plate; the high-temperature waste gas inlet is connected with the gas outlet channel through the high-temperature waste gas reversing flashboard in an open state; the preheated gas outlet is connected with the gas inlet channel through a preheated gas outlet reversing flashboard in an open state; the high-temperature waste gas inlet is connected with the gas inlet channel through the preheating gas outlet reversing flashboard in a closed state; the oxygen-containing gas inlet is connected with dust collection equipment through a cold waste gas reversing flashboard in a closed state; the cold waste gas outlet is connected with dust collection equipment through a cold waste gas reversing flashboard in an open state; the oxygen-containing gas inlet is connected with the oxygen-containing gas input equipment through the air inlet reversing flashboard in an open state; the cold waste gas outlet is connected with the oxygen-containing gas input device through the inlet reversing flashboard in a closed state.

And the air outlet channel is connected with an oxidizing gas input device, and the oxidizing gas input device is used for inputting oxidizing gas to oxidize zinc vapor output by the cyclone furnace into zinc oxide.

As an improvement of equipment for producing direct method zinc oxide by flying and melting zinc-containing powder, the heat exchanger uses a regenerative heat exchanger; the heat accumulating type heat exchanger comprises two heat accumulating chambers; one of the two regenerators is used for preheating the oxygen-containing gas, and the other regenerator is used for cooling the high-temperature exhaust gas; the oxygen-containing gas inlet and the preheated gas outlet are positioned in the regenerative chamber for preheating the oxygen-containing gas, and the high-temperature waste gas inlet and the cold-confirmation waste gas outlet are positioned in the regenerative chamber for cold-confirmation of the high-temperature waste gas; the oxygen-containing gas input device is connected with the oxygen-containing gas inlet through the air inlet reversing flashboard in an open state and is connected with the cold waste gas outlet through the air inlet reversing flashboard in a closed state; the dust collecting equipment is connected with the oxygen-containing gas inlet through the cold waste gas reversing gate in a closed state and is connected with the cold waste gas outlet through the cold waste gas reversing gate in an open state; the air inlet channel is connected with an air inlet of one cyclone furnace, a powder feeding device and a fuel inlet of the cyclone furnace are in a feeding state, an air outlet of the cyclone furnace is connected with an air inlet of the other cyclone furnace, a powder feeding device and a fuel inlet of the other cyclone furnace are in a feeding stopping state, and an air outlet of the other cyclone furnace is connected with an air outlet channel.

In order to ensure that the zinc vapor is oxidized before entering the regenerator, the high-temperature waste gas inlet and the preheated gas outlet are respectively connected with the oxidizing gas input device through the oxidizing gas reversing gate plate, the oxidizing gas reversing gate plate connected with the preheated gas outlet is in a closed state, and the oxidizing gas reversing gate plate connected with the high-temperature waste gas inlet is in an open state.

In order to ensure that the zinc vapor can be oxidized before entering the regenerator for cooling, a vent pipeline can be arranged between the preheated gas outlet and the high-temperature waste gas inlet for connection; and a gas flow regulating valve is arranged on the vent pipeline.

Drawings

The equipment for producing direct method zinc oxide by flying and melting zinc-containing powder and the beneficial technical effects thereof are explained in detail below with reference to the attached drawings and the specific implementation mode.

Fig. 1, 2, 3, 4, 5, and 6 are schematic structural diagrams of a first embodiment, a second embodiment, a third embodiment, a fourth embodiment, a fifth embodiment, and a sixth embodiment of the present invention, respectively.

Detailed Description

Example 1

Referring to fig. 1, fig. 1 shows a device for producing direct method zinc oxide by flying and melting zinc-containing powder, which comprises a cyclone furnace 1, an oxygen-containing gas input device 2, a gas cooling device 3 and a dust collecting device 4; the cyclone furnace 1 comprises powder feeding equipment 5, a powder feeding pipeline 6, an air inlet 7, an air outlet 8, a feeding hole 9 and a furnace wall 10; the powder feeding pipeline 6 comprises an outlet end 11 and an inlet end 12, the outlet end 11 is connected with the feeding port 9, and the inlet end 12 is connected with the powder feeding equipment 5; the oxygen-containing gas input equipment 2 is connected with the gas inlet channel 14, the gas inlet channel 14 is connected with the gas inlet 7, the gas outlet 8 is connected with the gas outlet channel 15, the gas outlet channel 15 is connected with the gas cooling and determining equipment 3, and the gas cooling and determining equipment 3 is connected with the dust collecting equipment 4.

The cyclone furnace also comprises a fuel inlet 13, and the fuel inlet 13 is arranged on the powder feeding pipeline 6; the fuel input port 13 is connected to a fuel flow rate regulation control device 16.

The device for producing direct method zinc oxide by flying and melting zinc-containing powder also comprises a liquid discharge port 17, and the liquid discharge port 17 is positioned at the bottom of the cyclone furnace 1 or near the bottom.

Embodiment 1 can input fuel into the cyclone furnace 1 through the fuel input port 13, and the temperature in the cyclone furnace 1 can be controlled to 1300-1400 ℃ to generate CO and CO by controlling the appropriate ratio of the fuel and the oxygen-containing gas through the oxygen-containing gas input device 2 or the fuel flow adjusting control device 16₂The content of CO in the reducing gas meets the requirement of zinc reduction; zinc-containing powder is input into the cyclone furnace 1 through a powder feeding device 5, the zinc-containing powder can be powdery zinc calcine or other zinc-containing powder, under the cyclone action in the cyclone furnace 1, the zinc-containing powder is dispersed in high-temperature reducing gas and is in a flying state, the heat and mass transfer efficiency is very high, the zinc-containing powder is rapidly melted into a liquid state and is reduced to separate out metal zinc vapor and slag in a melting state; the slag in the melting state is separated and adhered to the furnace wall 10 under the action of cyclone centrifugal force, the slag in the melting state flows downwards to the liquid outlet 17 to be output under the action of gravity, the purified high-temperature gas containing zinc vapor enters the gas cooling device 3 through the gas outlet channel 15 to be cooled and cooled, and the zinc vapor is cooled by CO in the gas₂Oxidized into zinc oxide, and collected in the dust collecting equipment 4, and all the obtained zinc oxide is a high-grade zinc oxide product containing few impurities.

Example 2

Referring to FIG. 2, FIG. 2 shows an apparatus for producing direct process zinc oxide by flying fusion of zinc-containing powder, which is substantially the same as in example 1 (FIG. 1), except that its fuel inlet 13 is not provided in the powder feed conduit 6, but is provided in the vicinity of the feed inlet 9; fig. 2 is also different from fig. 1 in that the air outlet passage 15 includes an air inlet 18 and an air outlet 19, the hollow of the air outlet passage 15 is substantially cylindrical, and the air inlet 18 and the air outlet 19 are respectively located near two ends of the cylindrical hollow and are tangentially connected with the cylindrical hollow; the air outlet 8 is connected with the air inlet 18, and the air outlet 19 is connected with the gas cooling device 3.

Compared with the embodiment 1, the embodiment 2 has the advantages that the high-temperature gas discharged from the cyclone furnace 1 is input into the cylindrical hollow air outlet channel 15 from the tangential air inlet 18 and is tangentially discharged from the air outlet 19, a centrifugal rotation effect is generated in the air outlet channel 15, the high-temperature gas output from the cyclone furnace 1 can be further purified and separated from molten dust, so that residual molten dust which cannot be completely purified and separated in the cyclone furnace 1 is prevented from entering the dust collecting equipment 4, the purity of a zinc oxide product can be improved, and high-grade zinc oxide meeting the quality requirement of the national standard GB/T3494-2012 can be produced.

Example 3

Referring to fig. 3, fig. 3 shows an installation for producing direct zinc oxide by flying and melting zinc-containing powder, which is essentially the same as in example 1 (fig. 1), except that the gas cooling installation 3 used is a heat exchanger; the heat exchanger comprises an oxygen-containing gas inlet 20, a preheated gas outlet 21, a high-temperature waste gas inlet 22 and a cold waste gas outlet 23; the oxygen-containing gas input device 2 is connected with the gas inlet channel 14 through a heat exchanger, the oxygen-containing gas input device 2 is connected with an oxygen-containing gas inlet 20, and a preheated gas outlet 21 is connected with the gas inlet channel 14; the air outlet channel 15 is connected with a high-temperature waste gas inlet 22, and a cold waste gas outlet 23 is connected with the dust collecting device 4.

If air which is not preheated is input into the cyclone furnace 1, the temperature in the cyclone furnace 1 is difficult to control to reach 1300-1400 ℃, and the content of CO in the high-temperature reducing gas meets the requirement of zinc reduction, so that oxygen-enriched air is required to be used. The use of oxygen-enriched air increases the combustion rate and intensity of the fuel, allowing a smaller volume of combustion gas to give off more heat than air, but because the fire-facing surface of the wall 10 is refractory, the interior of the cyclone furnace 1 is of a more refractory materialThe refractory materials on the furnace wall 10 close to the air inlet 7 are intensively washed by the oxygen-enriched air carrying fuel and are combusted at high speed to release heat, so that the local temperature is easy to overheat and often reaches over 1600 ℃, the refractory materials are easy to burn out, namely, the refractory materials are high-temperature-resistant corundum refractory materials, and generally burn out after being used for 3-4 months, and the furnace needs to be shut down for maintenance. Example 3 use of a Heat exchanger as a gas Cooling device, Zinc vapour being CO-reacted in the Heat exchanger₂The heat released by the oxidation of the zinc oxide can be used for heating the oxygen-containing gas, air is used as the oxygen-containing gas, the air can be heated to above 700 ℃, the preheating temperature of the air can be greatly increased, the temperature in the cyclone furnace 1 can be controlled to reach 1300-1400 ℃, and the content of CO in the reducing gas can meet the requirement of zinc reduction. The air combustion speed and the intensity are lower than those of oxygen-enriched air, so that local temperature overheating can be reduced, and under the condition of using corundum refractory materials, the furnace needs to be shut down for maintenance after 8-12 months, so that the service life of the kiln is prolonged, and the production cost of the oxygen-enriched air can be saved.

The heat exchanger mainly comprises a dividing wall type heat exchanger and a heat accumulating type heat exchanger, the heat accumulating type heat exchanger can improve the air preheating temperature by more than 500 ℃ compared with the dividing wall type heat exchanger, and the heat accumulating type heat exchanger is preferably used in the invention.

Example 4

Referring to fig. 4, fig. 4 shows an apparatus for producing direct process zinc oxide by flying and melting zinc-containing powder, which is substantially the same as in example 3 (fig. 3) except that the heat exchanger used is a regenerative heat exchanger; the regenerative heat exchanger includes two regenerators 24; one of the two regenerators 24 is used for preheating the oxygen-containing gas and the other is used for cooling the high temperature exhaust gas; the oxygen-containing gas inlet 20 and the preheated gas outlet 21 are located in the regenerator 24 for preheating the oxygen-containing gas, and the high-temperature exhaust gas inlet 22 and the cold-confirmation exhaust gas outlet 23 are located in the regenerator 24 for cold-confirmation high-temperature exhaust gas; the preheated gas outlet 21 is connected with the gas outlet passage 15 through a closed high-temperature waste gas reversing gate plate 25 (right side in fig. 4); the high-temperature exhaust gas inlet 22 is connected with the gas outlet passage 15 through a high-temperature exhaust gas reversing gate 25 in an open state (left side in fig. 4); the preheated gas outlet 21 is connected with the gas inlet channel 14 through a preheated gas outlet reversing flashboard 28 in an open state (the right side in the figure 4); the high-temperature exhaust gas inlet 22 is connected with the gas inlet channel 14 through a preheating gas outlet reversing gate plate 28 in a closed state (on the left side in fig. 4); the oxygen-containing gas inlet 20 is connected to the dust collecting apparatus 4 through a cold flue gas reversing shutter 26 in a closed state (right side in fig. 4); the cold confirmation exhaust gas outlet 23 is connected to the dust collecting apparatus 4 through a cold confirmation exhaust gas reversing shutter 26 in an open state (left side in fig. 4); the oxygen-containing gas inlet 20 is connected to the oxygen-containing gas introducing equipment 2 through an intake changeover damper 27 in an open state (right side in fig. 4); the cold flue gas outlet 23 is connected to the oxygen-containing gas feed device 2 via a closed inlet diverter gate 27 (to the left in fig. 4).

Embodiment 4 also differs from embodiment 3 in that an oxic gas inlet means 29 is connected to the outlet passage 15.

The high-temperature waste gas reversing gate plate 25, the cold waste gas reversing gate plate 26, the intake reversing gate plate 27 and the preheated gas exhaust reversing gate plate 28 are used for reversing operation, and are in an open state before reversing, and become a closed state after reversing, and are in a closed state before reversing, and become an open state after reversing. The reversing operation is generally performed once every 10 to 60 minutes. By reversing the operation, the two regenerators can be used alternately for preheating the oxygen-containing gas or for cooling the hot exhaust gas.

Embodiment 4 can preheat the air to more than 1200 ℃ because of adopting the regenerative heat exchanger, can make the content of CO in the high-temperature reducing gas reach the requirement of zinc reduction when controlling the temperature in the cyclone furnace 1 to more than 1500 ℃, because the reaction temperature is improved greatly, the reduction speed of zinc in the zinc-containing powder is also improved greatly, make the zinc that the zinc-containing powder contains fully reduce and gasify to the zinc vapour in the cyclone furnace 1, can make the waste residue zinc content that the drain outlet 17 discharges less than 0.1%.

The direct zinc oxide technology of the Wechsler furnace, the tunnel kiln and the like has high energy consumption, wastes caused by high zinc content in waste slag and can not be completely converted into high-grade zinc oxide, so that the economic benefit is realized only by using zinc calcine with high zinc content, and the economic benefit is not realized by using zinc calcine with lower zinc content or zinc-containing metallurgical waste. Example 4 can fully reduce the zinc in the zinc-containing powder, and all the zinc can be converted into high-grade zinc oxide, and some metallurgical waste materials with lower zinc content can also generate economic benefits, so the zinc-containing powder can be ground into powdery raw materials by using zinc calcine, or can be ground into powdery raw materials by using other raw materials with lower zinc content, such as zinc-containing furnace dust generated by blast furnace ironmaking, zinc-containing smoke dust generated by steel making, waste slag generated by blast furnace zinc smelting, and the like, or can be optionally combined by more than two of the raw materials, and the industrial waste residue with lower zinc content and the material with higher zinc content are matched for use, so that the industrial waste residue can be recycled.

Example 5

Referring to fig. 5, fig. 5 shows an apparatus for producing direct process zinc oxide by flying and melting zinc-containing powder, which is substantially the same as in example 3 (fig. 3) except that the heat exchanger used is a regenerative heat exchanger; the regenerative heat exchanger includes two regenerators 24; one of the two regenerators 24 is used for preheating the oxygen-containing gas and the other is used for cooling the high temperature exhaust gas; the oxygen-containing gas inlet 20 and the preheated gas outlet 21 are located in the regenerator 24 for preheating the oxygen-containing gas, and the high-temperature exhaust gas inlet 22 and the cold-confirmation exhaust gas outlet 23 are located in the regenerator 24 for cold-confirmation high-temperature exhaust gas; the oxygen-containing gas introducing device 2 is connected to the oxygen-containing gas inlet 20 through the intake changeover shutter 27 (shown on the right in fig. 5) in an open state, and is connected to the cold flue gas outlet 23 through the intake changeover shutter 27 (shown on the left in fig. 5) in a closed state; the dust collecting apparatus 4 is connected to the oxygen-containing gas inlet 20 through a cold waste gas reversing shutter 26 (shown on the right in fig. 5) in a closed state, and is connected to the cold waste gas outlet 23 through a cold waste gas reversing shutter 26 (shown on the left in fig. 5) in an open state; the air inlet channel 14 is connected with the air inlet 7 of one cyclone furnace 1, the powder feeding device 5 and the fuel inlet 13 of the cyclone furnace 1 are in a feeding state, the air outlet 8 of the cyclone furnace 1 is connected with the air inlet 7 of the other cyclone furnace 1, the powder feeding device 5 and the fuel inlet 13 of the other cyclone furnace 1 are in a feeding stop state, and the air outlet 8 of the other cyclone furnace 1 is connected with the air outlet channel 15.

Embodiment 5 (fig. 5) is also different from embodiment 3 (fig. 3) in that the high-temperature off-gas inlet 22 and the pre-heat gas outlet 21 are connected to the oxidizing gas supply device 29 through the oxidizing gas turning shutter 31, respectively, the oxidizing gas turning shutter 31 connected to the pre-heat gas outlet 21 is in a closed state (as shown in the right side of fig. 5), and the oxidizing gas turning shutter 31 connected to the high-temperature off-gas inlet 22 is in an open state (as shown in the left side of fig. 5).

The intake reversing shutter 27, the cold waste gas reversing shutter 26, and the oxidizing gas reversing shutter 31 are used for reversing operation, and are opened before reversing and closed after reversing, and are closed before reversing and opened after reversing. The reversing operation is generally performed once every 10 to 60 minutes.

In the embodiments 4 and 5, the regenerative heat exchanger is used, but the high-temperature waste gas reversing gate 25 and the preheated gas outlet reversing gate 28 in the embodiment 4 are both in contact with the high-temperature gas with the temperature of more than 1500 ℃ output by the cyclone furnace 1, the working environment is very severe, frequent switching operation is easy to damage, and the furnace shutdown maintenance is required generally after about 6 months of use. In embodiment 5, two cyclone furnaces 1 are required to be connected in series, but a high-temperature waste gas reversing gate plate 25 and a preheated gas outlet reversing gate plate 28 are not required, so that the failure rate is greatly reduced, and the molten dust carried by the high-temperature gas is separated by the two cyclone furnaces 1 connected in series, so that the high-temperature gas entering the regenerator is cleaner, the molten dust is prevented from entering the dust collecting equipment 4, the purity of a zinc oxide product is improved, and high-grade zinc oxide meeting the quality requirements of national standard GB/T3494-2012 can be produced.

Example 6

Referring to fig. 6, fig. 6 shows an apparatus for producing direct process zinc oxide by flying and melting zinc-containing powder, which is substantially the same as in example 5 (fig. 5), except that an oxidizing gas reversing gate 31 and an oxidizing gas feeding device 29 are not provided, and a vent pipe 32 is connected between a preheated gas outlet 21 and a high-temperature exhaust gas inlet 22; the ventilation duct 32 is provided with a gas flow rate adjustment valve 33.

If the metal zinc vapor directly enters the regenerator 24 and then permeates into the refractory material on the regenerator wall 30 to be condensed into metal zinc, after the metal zinc vapor is exchanged, the metal zinc condensed in the refractory material is oxidized with the oxygen-containing gas input into the regenerator 24 to generate zinc oxide to generate volume expansion, the refractory material on the regenerator wall 30 is damaged, and the regenerator needs to be shut down for maintenance after being used for 6-8 months. The oxidizing gas input device 29 in the embodiments 4 and 5 is used for inputting oxidizing gas, which can rapidly oxidize the metal zinc vapor into zinc oxide before entering the regenerator 24, and the embodiment 6 can control the proper flow rate of the oxidizing gas and the metal zinc vapor entering the high-temperature exhaust gas inlet 22 to rapidly oxidize the metal zinc vapor into zinc oxide by adjusting the gas flow regulating valve 33. Therefore, the situation that metal zinc vapor is condensed into metal zinc to cause damage in the refractory material on the regenerator wall 30 can be avoided, the regenerator can be used for more than 18 months and needs to be overhauled, and the service life of the regenerator can be greatly prolonged.

The oxidizing gas input device 29 or the ventilation pipeline 32 can also oxidize the oxidizing gas and CO in the high-temperature reducing gas output by the cyclone furnace 1 to release heat, and then the heat is recovered by the heat exchanger, and the recovered heat is used for heating the oxygen-containing gas input by the oxygen-containing gas input device 2.

In the above embodiment, the dust collecting apparatus 4 includes a bag dust collector, and the oxygen-containing gas input apparatus 2 may employ a blower; the air inlet 7, the air outlet 8 and the feed inlet 9 are respectively arranged on the furnace wall 10; the powder feeding device 5 is used for inputting the zinc-containing powder into a feeding hole 9 through a powder feeding pipeline 6; the powder feeding device 5 can adopt a device for feeding powder materials, such as an impeller feeder, a screw feeder and the like, and can also adopt other conventional devices as long as the powder materials can be fed into the inlet end 12 of the powder feeding pipeline 6; the hearth of the cyclone furnace 1 is basically cylindrical, and the air inlet 7 and the air outlet 8 are respectively positioned near two ends of the cylindrical hearth and are in tangential connection with the cylindrical hearth; the feed opening 9 is located substantially in the centre of the top of the cylindrical furnace.

In the above embodiment, the fuel input port 13 may input liquid fuel, gas fuel, and pulverized solid fuel, which is usually pulverized coal. When the powdery solid fuel is used, the powdery solid fuel can be mixed with zinc-containing powder in proportion according to the required amount in advance, and then the mixture is input into the cyclone furnace 1 from the inlet end 12 by using the powder feeding device 5, wherein the inlet end 12 is an input port for the zinc-containing powder and is also a fuel input port, so that a separate fuel input port 13 and a separate fuel flow regulation and control device 16 are not required to be arranged.

The independent arrangement of the fuel inlet 13 and the fuel flow regulating and controlling device 16 can conveniently regulate and control the temperature and the CO content in the hearth, avoid the waste caused by excessive use of fuel and also avoid the insufficient use of fuel to ensure that the zinc-containing powder cannot be fully reduced.

The present invention is not limited to the above-described specific modes. In light of the above teachings, those skilled in the art can make appropriate modifications to the above embodiments, and such modifications are intended to fall within the scope of the claimed invention. Certain terminology is used in the description for convenience only and is not limiting.