CN114410985A - Zinc leaching slag treatment system and treatment method - Google Patents
Zinc leaching slag treatment system and treatment method Download PDFInfo
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- CN114410985A CN114410985A CN202210126001.5A CN202210126001A CN114410985A CN 114410985 A CN114410985 A CN 114410985A CN 202210126001 A CN202210126001 A CN 202210126001A CN 114410985 A CN114410985 A CN 114410985A
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- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 title claims abstract description 64
- 229910052725 zinc Inorganic materials 0.000 title claims abstract description 64
- 239000011701 zinc Substances 0.000 title claims abstract description 64
- 238000002386 leaching Methods 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000002893 slag Substances 0.000 title claims description 27
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims abstract description 76
- 238000001035 drying Methods 0.000 claims abstract description 67
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 48
- 239000003546 flue gas Substances 0.000 claims abstract description 48
- 239000011787 zinc oxide Substances 0.000 claims abstract description 39
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 238000010791 quenching Methods 0.000 claims abstract description 12
- 230000000171 quenching effect Effects 0.000 claims abstract description 12
- 239000000428 dust Substances 0.000 claims description 42
- 239000000463 material Substances 0.000 claims description 30
- 239000000779 smoke Substances 0.000 claims description 29
- 238000002156 mixing Methods 0.000 claims description 25
- 239000000446 fuel Substances 0.000 claims description 18
- 238000004806 packaging method and process Methods 0.000 claims description 13
- 238000007599 discharging Methods 0.000 claims description 8
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 150000002739 metals Chemical class 0.000 claims description 6
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 4
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 4
- 241001330002 Bambuseae Species 0.000 claims description 4
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 4
- 239000011425 bamboo Substances 0.000 claims description 4
- 230000003009 desulfurizing effect Effects 0.000 claims description 4
- 238000012856 packing Methods 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 abstract description 11
- 239000002918 waste heat Substances 0.000 abstract description 6
- 238000011084 recovery Methods 0.000 abstract description 4
- 238000005272 metallurgy Methods 0.000 abstract description 2
- 229910044991 metal oxide Inorganic materials 0.000 abstract 1
- 150000004706 metal oxides Chemical class 0.000 abstract 1
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 229910052732 germanium Inorganic materials 0.000 description 3
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 description 3
- 238000009854 hydrometallurgy Methods 0.000 description 3
- 229910052738 indium Inorganic materials 0.000 description 3
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000009853 pyrometallurgy Methods 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B19/00—Obtaining zinc or zinc oxide
- C22B19/34—Obtaining zinc oxide
- C22B19/38—Obtaining zinc oxide in rotary furnaces
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/005—Preliminary treatment of scrap
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a zinc leaching residue treatment system and a zinc leaching residue treatment method, belongs to the field of metallurgy, and solves the problems of large equipment floor area, high investment cost and low waste heat recovery efficiency in the prior art. The invention comprises a drying device, a feeding system, a rotary kiln, a water quenching tank and a flue gas system, wherein the drying device adopts an external heating type dryer, the external heating type dryer comprises a drying cylinder and a heat exchange chamber, the drying cylinder is positioned in the heat exchange chamber, the heat exchange chamber is communicated with a kiln tail settling chamber, two ends of the drying cylinder are respectively provided with a cylinder head cover and a cylinder tail cover, the cylinder head cover is connected with a rotary kiln chute, and the flue gas system is connected with the external heating type dryer. The treatment method comprises the following steps: and (3) drying the zinc leaching residues in a drying cylinder, then feeding the dried zinc leaching residues into a rotary kiln, feeding the valuable metal oxides and the flue gas into a heat exchange chamber through a kiln tail settling chamber, carrying out heat exchange with the drying cylinder, feeding the flue gas into a flue gas system, and collecting the zinc oxide. The invention fully utilizes the flue gas waste heat of the rotary kiln and solves the problem that the traditional drier needs to be independently provided with a heat source.
Description
Technical Field
The invention belongs to the field of metallurgy, and particularly relates to a zinc leaching residue treatment system and a zinc leaching residue treatment method.
Background
At present, zinc smelting mainly comprises zinc hydrometallurgy and zinc pyrometallurgy, and the zinc hydrometallurgy accounts for more than 80 percent. In the zinc hydrometallurgy process, zinc leaching residues with the same zinc yield are produced, and the water content of the zinc leaching residues is generally as high as 35-40%. At present, the zinc leaching slag is treated by a rotary kiln volatilization method, a top-blown furnace method and a side-blown furnace method at home, valuable metals such as zinc, lead, indium, germanium and the like in the slag are recovered, and because the rotary kiln volatilization method has mature process and simple operation, more than 90 percent of the zinc leaching slag is treated by a rotary kiln at present at home. The rotary kiln volatilization method is characterized in that coke powder is used as a fuel and a reducing agent, valuable metals such as zinc, lead, indium, germanium and the like in zinc leaching residues are reduced to enter smoke, then the smoke is oxidized to form oxides, and the oxides and the smoke enter a dust collection system to be captured, so that a zinc oxide product with high grade is obtained. Because the water content of zinc leaching residues is high, the water content of materials is controlled to be 12-18% and then the materials are conveyed to a rotary kiln for disposal after being dried in advance or mixed with other dry materials. The traditional pre-drying method generally adopts a counter-flow rotary drying kiln, and uses coal, heavy oil, natural gas or coal gas for heat supply, thereby increasing the occupied area and the equipment investment. The flue gas amount is increased sharply with other dry material ingredients, wherein the moisture content of the flue gas is generally above 12%, the dew point of the flue gas is greatly reduced, and the corrosion probability of equipment is increased. In order to reduce the influence of flue gas on equipment corrosion in engineering, the temperature of the flue gas in cooling or waste heat recovery equipment, dust collection equipment and a flue gas pipeline is generally controlled to be 30 ℃ above the dew point, so that the investment cost and the occupied area of a flue gas system of the equipment are directly increased, and the recovery amount of the waste heat is reduced.
Disclosure of Invention
The invention aims to provide a zinc leaching residue treatment system to solve the problems of large equipment floor area, high investment cost and low waste heat recovery efficiency of the conventional process for performing reduction volatilization treatment on zinc leaching residue by using a rotary kiln.
Another object of the invention is to provide a zinc leaching residue treatment method.
The technical scheme of the invention is as follows: the utility model provides a zinc leaching slag processing system, including drying device, the feeding system, the rotary kiln, shrend groove and flue gas system, be equipped with the rotary kiln chute on the rotary kiln, the rotary kiln both ends are equipped with kiln head and kiln tail settling chamber respectively, the bottom export of kiln head passes through the shrend chute and connects the shrend groove, drying device adopts outer hot type desiccator, outer hot type desiccator includes drying cylinder and heat exchange chamber, drying cylinder is located the heat exchange chamber, the heat exchange chamber is linked together with kiln tail settling chamber, the heat exchange chamber bottom is equipped with out the hopper, be connected with drying cylinder chute on the drying cylinder, drying cylinder both ends are equipped with barrel head cover and barrel tail cover respectively, barrel head cover passes through the feeding system and links to each other with the rotary kiln chute, flue gas system links to each other with outer hot type desiccator.
As a further improvement of the invention, the lower part of the heat exchange chamber is provided with a plurality of baffles along the length direction.
As a further development of the invention, the outer wall of the drying cylinder is provided with a plurality of fins parallel to its axis.
As a further improvement of the invention, the flue gas system comprises a dust collector, a zinc oxide trap, a desulphurization device, a demister and an exhaust funnel; the cylinder tail cover is communicated with a dust collector, and the dust collector is connected with an exhaust cylinder through a first induced draft fan; the heat exchange chamber is connected with the zinc oxide catcher, and the zinc oxide catcher is connected with the desulphurization unit, the demister and the exhaust funnel in sequence through the second induced draft fan.
As a further improvement of the invention, the drying device also comprises a box type scattering feeder which is connected with the drying cylinder chute through a leaching residue quantitative feeder.
As a further improvement of the invention, the device also comprises a first hoisting machine, wherein an outlet is arranged at the bottom of the cylinder tail cover, and the outlet at the bottom of the cylinder tail cover is connected with a feed inlet of the first hoisting machine; a first scraper conveyor is arranged below an outlet at the bottom of the dust collector, and the discharging end of the first scraper conveyor is connected with a feeding hole of a first elevator; the discharge gate of first lifting machine links to each other with box batcher of breaing up.
As a further improvement of the invention, the feeding system comprises a material returning bin, a fuel bin, a mixing bin, a cylinder mixer and a second elevator, wherein the drying cylinder is obliquely arranged, the cylinder head cover is positioned at the low end of the drying cylinder, the bottom of the cylinder head cover is provided with an outlet, the bottom outlet of the cylinder head cover is connected with a feeding hole of the second elevator, and the bottom outlet of the kiln tail settling chamber is connected with the feeding hole of the second elevator; the discharge gate and the return bin of second lifting machine link to each other, and the return bin links to each other with mixing bunker, and the bunker links to each other with mixing bunker, and mixing bunker links to each other with the material loading end that the drum mixed the machine, and the unloading end that the drum mixed the machine links to each other with the rotary kiln chute.
As a further improvement of the invention, a second scraper conveyor is arranged below the discharge hopper, and the discharging end of the second scraper conveyor is connected with a smoke dust packaging machine.
As a further improvement of the invention, a third scraper conveyor is arranged below the bottom outlet of the zinc oxide catcher, and a zinc oxide packaging machine is arranged at the discharging end of the third scraper conveyor.
A zinc leaching slag treatment method comprises the following steps:
A. zinc leaching residues are sequentially fed to a chute of a drying cylinder by a box type scattering feeder and a leaching residue quantitative feeder, then enter the drying cylinder to be dried, the dried zinc leaching residues are discharged from an outlet at the bottom of a cylinder head cover and are conveyed to a material returning bin by a second elevator, and materials collected by a cylinder tail cover are conveyed to the box type scattering feeder for proportioning by the first elevator;
B. zinc leaching residues in the return bin enter a mixing bin, fuel in the fuel bin enters the mixing bin, mixed materials in the mixing bin enter a cylindrical mixer, and the mixed materials are mixed in the cylindrical mixer and then enter a rotary kiln through a rotary kiln chute;
C. in the rotary kiln, valuable metals in zinc leaching residues are reduced to enter flue gas, then are oxidized to form oxides, and enter a heat exchange chamber together with the flue gas through a kiln tail settling chamber, materials flowing out of the kiln tail settling chamber are conveyed to a material returning bin by a second lifting machine, kiln slag produced by the rotary kiln is discharged from a bottom outlet of a kiln head and flows into a water quenching tank through a water quenching chute;
D. the flue gas entering the heat exchange chamber from the kiln tail settling chamber exchanges heat with the drying cylinder, the zinc leaching residue in the drying cylinder is heated and dried by using the temperature of the flue gas, and when the flue gas flows through the heat exchange chamber, under the action of the baffle, a part of smoke dust settles at the bottom of the heat exchange chamber and is discharged from the discharge hopper, and the smoke dust is conveyed to a smoke dust packaging machine for packaging through a second scraper conveyor;
E. the rest flue gas enters a zinc oxide catcher under the action of a second induced draft fan to collect zinc oxide products, the zinc oxide products are discharged from a bottom outlet of the zinc oxide catcher and are conveyed to a zinc oxide packaging machine by a third scraper conveyor to be packaged, and the rest flue gas is desulfurized by a desulfurizing device, demisted by a demister and then exhausted by an exhaust funnel;
F. steam produced in the drying cylinder enters the dust collector under the action of the first induced draft fan, collected smoke dust is discharged from a bottom outlet of the dust collector, the smoke dust is conveyed to a feed inlet of the first lifting machine through the first scraper conveyor, the smoke dust is conveyed to a box type scattering feeder through the first lifting machine, and the rest steam is emptied through the exhaust funnel.
The invention has the beneficial effects that:
1. according to the invention, the external heating type dryer is arranged behind the rotary kiln, so that the drying and reduction volatilization treatment of zinc leaching residues are realized on the same production line, the waste heat of flue gas of the rotary kiln is fully utilized, the problem that a heat source needs to be independently configured in the traditional dryer is solved, the occupied area of equipment is saved, and the investment cost is saved.
2. According to the external heating type dryer, the fins are arranged on the outer wall of the drying cylinder, so that the heat transfer efficiency of the external heating type dryer is improved, and the utilization rate of the heat of flue gas is improved; the baffle is arranged in the heat exchange chamber, the flow resistance of the smoke in the heat exchange chamber is increased, the residence time of the smoke in the heat exchange chamber is prolonged, the utilization rate of the heat of the smoke can be improved, and part of the smoke can be effectively collected, wherein the part of the smoke is zinc oxide with lower zinc content, so that the grade of zinc oxide products in the zinc oxide catcher is improved.
3. The method has reasonable process flow and high production efficiency.
Drawings
FIG. 1 is a schematic view of a zinc leaching residue treatment system according to the present invention.
In the figure: 1-a fuel bunker; 2-a fuel constant feeder; 3-returning the material bin; 4-returning the material quantitative feeder; 5-mixing the materials in a storage bin; 6-quantitative material feeder of mixture; 7-drum mixer; 8-a rotary kiln; 81-kiln tail settling chamber; 82-kiln head; 83-burner; 84-chute of rotary kiln; 9-water quenching chute; 10-a second hoist; 11-box type scattering feeder; 12-leaching residue quantitative feeder; 13-external heating type drier; 131-a drying cylinder; 132-a cartridge head cover; 133-cylinder tail cover; 134-a heat exchange chamber; 135-a baffle; 136-a fin; 137-a discharge hopper; 138-drying cylinder chute; 14-a second scraper conveyor; 15-a first hoist; 16-a dust collector; 17-a first induced draft fan; 18-an exhaust funnel; 19-a first scraper conveyor; 21-zinc oxide trap; 22-a second induced draft fan; 23-a desulfurization unit; 24-a demister; 25-a third scraper conveyor; 26-zinc oxide packaging machine; 27-smoke packaging machine; 28-combustion-supporting device; 29-water quenching tank.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1, a zinc leaching slag treatment system comprises a drying device, a feeding system, a rotary kiln 8, a water quenching tank 29 and a flue gas system, wherein the rotary kiln 8 is provided with a rotary kiln chute 84, the rotary kiln chute 84 is made of high-temperature resistant steel or water-cooled wall, two ends of the rotary kiln 8 are respectively provided with a kiln head 82 and a kiln tail settling chamber 81, the kiln head 82 is provided with a burner 83, the burner 83 is connected with an air blower 28, the bottom outlet of the kiln head 82 is connected with the water quenching tank 29 through the water quenching chute 9, the drying device adopts an external heating type dryer 13, the external heating type dryer 13 comprises a drying cylinder 131 and a heat exchange chamber 134, the drying cylinder 131 is positioned in the heat exchange chamber 134, refractory materials are built in the heat exchange chamber 134, the heat exchange chamber 134 is communicated with the kiln tail settling chamber 81, the bottom of the heat exchange chamber 134 is provided with a discharge hopper 137, the drying cylinder chute 138 is connected to the drying cylinder 131, two ends of the drying cylinder 131 are respectively provided with a cylinder head cover 132 and a cylinder tail cover 133, the barrel head cover 132 and the barrel tail cover 133 are positioned outside the heat exchange chamber 134, the barrel head cover 132 is connected with the rotary kiln chute 84 through a feeding system, and the flue gas system is connected with the external heating type dryer 13.
A plurality of baffles 135 are provided along the length of the lower portion of the heat exchange chamber 134.
The outer wall of the drying cylinder 131 is provided with a plurality of fins 136 parallel to the axis thereof.
The flue gas system comprises a dust collector 16, a zinc oxide catcher 21, a desulphurization device 23, a demister 24 and an exhaust funnel 18; the cylinder tail cover 133 is communicated with the dust collector 16, and the dust collector 16 is connected with the exhaust cylinder 18 through a first induced draft fan 17; the heat exchange chamber 134 is connected with the zinc oxide catcher 21, and the zinc oxide catcher 21 is sequentially connected with the desulphurization device 23, the demister 24 and the exhaust stack 18 through a second induced draft fan 22.
Still include box batcher 11 that breaks up, box batcher 11 inside lining polyethylene macromolecular material that breaks up, box batcher 11 that breaks up links to each other with dry section of thick bamboo chute 138 through leaching sediment batcher 12.
The automatic feeding device also comprises a first lifter 15, wherein an outlet is formed in the bottom of the cylinder tail cover 133, and the outlet in the bottom of the cylinder tail cover 133 is connected with a feeding hole of the first lifter 15; a first scraper conveyor 19 is arranged below an outlet at the bottom of the dust collector 16, and the discharging end of the first scraper conveyor 19 is connected with a feeding hole of the first elevator 15; the discharge port of the first hoister 15 is connected with the box type scattering feeder 11.
The feeding system comprises a return bin 3, a fuel bin 1, a mixing bin 5, a cylinder mixer 7 and a second elevator 10, wherein a drying cylinder 131 is obliquely arranged, a cylinder head cover 132 is positioned at the low end of the drying cylinder 131, an outlet is formed in the bottom of the cylinder head cover 132, the outlet in the bottom of the cylinder head cover 132 is connected with a feeding hole of the second elevator 10, and the outlet in the bottom of a kiln tail settling chamber 81 is connected with the feeding hole of the second elevator 10; the discharge gate of second lifting machine 10 links to each other with return bin 3, and return bin 3 links to each other with mixing bunker 5 through return quantitative feeder 4, and bunker 1 passes through fuel quantitative feeder 2 and links to each other with mixing bunker 5, and mixing bunker 5 passes through mixing material quantitative feeder 6 and links to each other with the material loading end of drum mixer 7, and the unloading end of drum mixer 7 links to each other with rotary kiln chute 84.
A second scraper conveyor 14 is arranged below the discharge hopper 137, and the discharge end of the second scraper conveyor 14 is connected with a smoke packing machine 27.
A third scraper conveyor 25 is arranged below the bottom outlet of the zinc oxide catcher 21, and a zinc oxide packing machine 26 is arranged at the blanking end of the third scraper conveyor 25.
The dust collector 16 and the zinc oxide collector 21 adopt a cloth bag dust collector or an electric dust collector, and the outer walls of the cloth bag dust collector and the electric dust collector are provided with heat insulation cotton.
The second induced draft fan 22 is made of corrosion-resistant materials and is controlled in a frequency conversion mode.
The fuel constant feeder 2 and the return constant feeder 4 are controlled by frequency conversion.
The zinc leaching slag is dried by adopting an external heating type dryer 13, a drying heat source utilizes a rotary kiln 8 to treat high-temperature dust-containing flue gas generated in the zinc leaching slag process, the flue gas and the drying cylinder 131 realize heat transfer in a heat exchange chamber 134 to heat the zinc leaching slag in the drying cylinder, and the zinc leaching slag is continuously dried in the drying cylinder 131 under the action of heat transfer.
The device has simple structure and high degree of mechanization, and can realize automatic control of the process.
A zinc leaching slag treatment method comprises the following steps:
A. zinc leaching residues are sequentially fed to a drying cylinder chute 138 through a box type scattering feeder 11 and a leaching residue quantitative feeder 12, then enter a drying cylinder 131 to be dried, the dried zinc leaching residues are discharged from a bottom outlet of a cylinder head cover 132 and are conveyed to a material returning bin 3 through a second lifting machine 10, and materials collected by a cylinder tail cover 133 are conveyed to the box type scattering feeder 11 through a first lifting machine 15 to be proportioned;
B. zinc leaching residues in the return bin 3 are weighed and metered by a return quantitative feeder 4 and then enter a mixing bin 5, fuel in the fuel bin 1 is weighed and metered by a fuel quantitative feeder 2 and then enters the mixing bin 5, the zinc leaching residues and the fuel are simultaneously discharged into the mixing bin 5 to realize first mixing, mixed materials in the mixing bin 5 are weighed and metered by a mixed material quantitative feeder 6 and then discharged into a cylinder mixer 7, and the materials are mixed for the second time in the cylinder mixer 7 and then enter a rotary kiln 8 through a rotary kiln chute 84;
C. burning fuel in a rotary kiln 8, controlling the temperature of a burning zone in the rotary kiln at 1100-1250 ℃ by adjusting a fuel constant feeder 2, a burner 83 and an air blower 28, reducing valuable metals such as zinc, lead, indium and germanium in zinc leaching slag into flue gas in the rotary kiln 8, oxidizing the valuable metals into oxides, enabling the oxides and the flue gas to enter a heat exchange chamber 134 through a kiln tail settling chamber 81, conveying materials flowing out of the kiln tail settling chamber 81 to a return bin 3 through a second elevator 10, discharging kiln slag produced by the rotary kiln 8 from a bottom outlet of a kiln head 82, and enabling the kiln slag to flow into a water quenching tank 29 through a water quenching chute 9;
D. the flue gas entering the heat exchange chamber 134 from the kiln tail settling chamber 81 exchanges heat with the drying cylinder 131, the zinc leaching residue in the drying cylinder 131 is heated and dried by using the temperature of the flue gas, when the flue gas flows through the heat exchange chamber 134, under the action of the baffle 135, a part of smoke (low-grade zinc oxide) settles at the bottom of the heat exchange chamber 134 and is discharged from the discharge hopper 137, and the smoke is conveyed to the smoke packaging machine 27 through the second scraper conveyor 14 for packaging;
E. the rest flue gas enters a zinc oxide catcher 21 under the action of a second induced draft fan 22 to collect zinc oxide products, the zinc oxide products are discharged from a bottom outlet of the zinc oxide catcher 21 and are conveyed to a zinc oxide packing machine 26 by a third scraper conveyor 25 to be packed, and the rest flue gas is desulfurized by a desulfurizing device 23, demisted by a demister 24 and then emptied by an exhaust funnel 18;
F. the flue gas produced in the drying cylinder 131 mainly contains water vapor, the water vapor enters the dust collector 16 under the action of the first induced draft fan 17, the collected smoke dust is discharged from the bottom outlet of the dust collector 16 and is conveyed to the feed inlet of the first lifting machine 15 by the first scraper conveyor 19, the collected smoke dust is conveyed to the box type scattering feeder 11 by the first lifting machine 15, and the rest water vapor is exhausted through the exhaust cylinder 18.
Claims (10)
1. The utility model provides a zinc leaching slag processing system, includes drying device, feeding system, rotary kiln, shrend groove and flue gas system, be equipped with the rotary kiln chute on the rotary kiln, the rotary kiln both ends are equipped with kiln head and kiln tail settling chamber respectively, and the bottom export of kiln head passes through the shrend chute and connects shrend groove, its characterized in that: the drying device adopts outer hot type desiccator (13), and outer hot type desiccator (13) are including drying cylinder (131) and heat exchange chamber (134), and drying cylinder (131) are located heat exchange chamber (134), and heat exchange chamber (134) are linked together with kiln tail settling chamber (81), and heat exchange chamber (134) bottom is equipped with out hopper (137), is connected with drying cylinder chute (138) on drying cylinder (131), and drying cylinder (131) both ends are equipped with a section of thick bamboo hood (132) and a section of thick bamboo tail cover (133) respectively, and a section of thick bamboo hood (132) link to each other with rotary kiln chute (84) through the feeding system, the flue gas system links to each other with outer hot type desiccator (13).
2. The zinc leach slag treatment system according to claim 1, wherein: a plurality of baffles (135) are arranged at the lower part of the heat exchange chamber (134) along the length direction.
3. The zinc leach slag treatment system according to claim 2, wherein: the outer wall of the drying cylinder (131) is provided with a plurality of fins (136) parallel to the axis of the drying cylinder.
4. A zinc leach slag treatment system according to any one of claims 1 to 3, wherein: the flue gas system comprises a dust collector (16), a zinc oxide catcher (21), a desulphurization device (23), a demister (24) and an exhaust funnel (18); the cylinder tail cover (133) is communicated with a dust collector (16), and the dust collector (16) is connected with an exhaust cylinder (18) through a first induced draft fan (17); the heat exchange chamber (134) is connected with the zinc oxide catcher (21), and the zinc oxide catcher (21) is sequentially connected with the desulfurizing device (23), the demister (24) and the exhaust funnel (18) through the second induced draft fan (22).
5. The zinc leach slag treatment system according to claim 4, wherein: the device is characterized by further comprising a box type scattering feeder (11), wherein the box type scattering feeder (11) is connected with a drying cylinder chute (138) through a leaching residue quantitative feeder (12).
6. The zinc leach slag treatment system according to claim 5, wherein: the automatic feeding device is characterized by further comprising a first hoisting machine (15), an outlet is formed in the bottom of the cylinder tail cover (133), and the outlet in the bottom of the cylinder tail cover (133) is connected with a feeding hole of the first hoisting machine (15); a first scraper conveyor (19) is arranged below an outlet at the bottom of the dust collector (16), and the discharging end of the first scraper conveyor (19) is connected with the feeding hole of a first lifting machine (15); the discharge port of the first hoister (15) is connected with the box type scattering feeder (11).
7. The zinc leach slag treatment system according to claim 6, wherein: the feeding system comprises a return bin (3), a fuel bin (1), a mixing bin (5), a cylinder mixer (7) and a second elevator (10), the drying cylinder (131) is obliquely arranged, a cylinder head cover (132) is positioned at the low end of the drying cylinder (131), an outlet is formed in the bottom of the cylinder head cover (132), the outlet in the bottom of the cylinder head cover (132) is connected with a feeding hole of the second elevator (10), and the outlet in the bottom of the kiln tail settling chamber (81) is connected with the feeding hole of the second elevator (10); the discharge gate of second lifting machine (10) links to each other with return feed bin (3), and return feed bin (3) link to each other with mixing bunker (5), and bunker (1) links to each other with mixing bunker (5), and mixing bunker (5) link to each other with the material loading end of drum mixer (7), and the unloading end of drum mixer (7) links to each other with rotary kiln chute (84).
8. The zinc leach slag treatment system according to claim 7, wherein: a second scraper conveyor (14) is arranged below the discharge hopper (137), and the discharging end of the second scraper conveyor (14) is connected with a smoke packaging machine (27).
9. The zinc leach slag treatment system according to claim 8, wherein: a third scraper conveyor (25) is arranged below an outlet at the bottom of the zinc oxide catcher (21), and a zinc oxide packing machine (26) is arranged at the discharging end of the third scraper conveyor (25).
10. A zinc leaching slag treatment method is characterized by comprising the following steps:
A. zinc leaching residues are sequentially fed to a drying cylinder chute (138) through a box type scattering feeder (11) and a leaching residue quantitative feeder (12), then the zinc leaching residues enter a drying cylinder (131) to be dried, the dried zinc leaching residues are discharged from a bottom outlet of a cylinder head cover (132) and are conveyed to a return bin (3) through a second lifting machine (10), and materials collected by a cylinder tail cover (133) are conveyed to the box type scattering feeder (11) through a first lifting machine (15) to be proportioned;
B. zinc leaching residues in the return bin (3) enter a mixing bin (5), fuel in the fuel bin (1) enters the mixing bin (5), mixed materials in the mixing bin (5) enter a cylindrical mixer (7), and are mixed in the cylindrical mixer (7) and then enter a rotary kiln (8) through a rotary kiln chute (84);
C. in the rotary kiln (8), valuable metals in zinc leaching residues are reduced to enter flue gas, then are oxidized to form oxides, and enter a heat exchange chamber (134) together with the flue gas through a kiln tail settling chamber (81), materials flowing out of the kiln tail settling chamber (81) are conveyed to a return bin (3) by a second lifting machine (10), kiln residues produced by the rotary kiln (8) are discharged from a bottom outlet of a kiln head (82) and flow into a water quenching tank (29) through a water quenching chute (9);
D. flue gas entering a heat exchange chamber (134) from a kiln tail settling chamber (81) exchanges heat with a drying cylinder (131), zinc leaching residues in the drying cylinder (131) are heated and dried by using the temperature of the flue gas, when the flue gas flows through the heat exchange chamber (134), under the action of a baffle (135), a part of smoke dust is settled at the bottom of the heat exchange chamber (134) and discharged from a discharge hopper (137), and the smoke dust is conveyed to a smoke dust packaging machine (27) for packaging through a second scraper conveyor (14);
E. the rest flue gas enters a zinc oxide catcher (21) under the action of a second induced draft fan (22) to collect zinc oxide products, the zinc oxide products are discharged from a bottom outlet of the zinc oxide catcher (21) and are conveyed to a zinc oxide packaging machine (26) by a third scraper conveyor (25) to be packaged, and the rest flue gas is desulfurized by a desulfurizing device (23), demisted by a demister (24) and then emptied by an exhaust funnel (18);
F. steam produced in the drying cylinder (131) enters the dust collector (16) under the action of a first induced draft fan (17), collected smoke dust is discharged from a bottom outlet of the dust collector (16), the smoke dust is conveyed to a feed inlet of a first lifting machine (15) by a first scraper conveyor (19), the smoke dust is conveyed to a box type scattering feeder (11) by the first lifting machine (15), and residual steam is emptied through an exhaust cylinder (18).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210126001.5A CN114410985A (en) | 2022-02-10 | 2022-02-10 | Zinc leaching slag treatment system and treatment method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210126001.5A CN114410985A (en) | 2022-02-10 | 2022-02-10 | Zinc leaching slag treatment system and treatment method |
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Application publication date: 20220429 |