CN107519745A - A kind of zinc oxide desulfurization method suitable for zinc abstraction system - Google Patents
A kind of zinc oxide desulfurization method suitable for zinc abstraction system Download PDFInfo
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- CN107519745A CN107519745A CN201610443232.3A CN201610443232A CN107519745A CN 107519745 A CN107519745 A CN 107519745A CN 201610443232 A CN201610443232 A CN 201610443232A CN 107519745 A CN107519745 A CN 107519745A
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- Prior art keywords
- zinc
- cleaning solution
- circulating slot
- ripple washer
- pump
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
- B01D53/502—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific solution or suspension
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/73—After-treatment of removed components
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/80—Semi-solid phase processes, i.e. by using slurries
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/025—Other waste gases from metallurgy plants
Abstract
The present invention relates to a kind of zinc oxide desulfurization method for being used to remove caused SO 2 tail gas in zinc abstraction system, absorbed using two-stage dynamic wave scrubbing, aeration tower forces oxidation, after doctor solution dechlorination, return to Zn system synthetical recovery zinc, this method desulfuration efficiency is high, production cost is low, pipeline is not easily blocked, doctor solution is used for synthetical recovery zinc, and be particularly suitable for use in zinc abstraction system.
Description
Technical field
The present invention relates to a kind of zinc oxide desulfurization method for being used to remove caused SO 2 tail gas in zinc abstraction system.
Background technology
Zinc oxide is the intermediate product of lead-zinc smelting system, carry out caused sulfur dioxide in removing system using zinc oxide, desulphurization cost can be substantially reduced, so just there is research to this method from the 1980s at home, but because desulfurization degree is low, line clogging, desulfurization product can not comprehensive reutilization the reason for, fail commercial Application.
The content of the invention
It is an object of the invention to change the deficiency of existing zinc oxide desulfurization technology, and provide a kind of zinc oxide desulfurization method suitable for zinc abstraction system.
The technical solution adopted for the present invention to solve the technical problems is：A kind of zinc oxide desulfurization method suitable for zinc abstraction system, it is as follows the step of this method：
Step 1）, by zinc abstraction system turn round Rotary Kiln caused by intermediate products ZnO powder zinc oxide intermediate bunker is delivered to by the jet pump that gasifies, the belt conveyer scale by the installation of intermediate bunker bottom and screw(-type) feeder deliver to ZnO powder with stock tank again, ZnO powder and water are mixedly configured into suspension in stock tank, by stirring, cleaning solution is obtained；
Step 2）, will be squeezed into respectively in I and II dynamic wave scrubber circulating slot with the cleaning solution prepared in stock tank by delivery pump, the inverse shower nozzle being again respectively delivered to cleaning solution by the circulating pump on I and II dynamic wave scrubber circulating slot in I and II dynamic wave scrubber, via the cleaning solution that inverse shower nozzle sprays upwards turbulence froth zone is formed with the sulfur dioxide flue gas entered at the top of first order kinetics ripple washer reverse jet tube, foam interface is constantly updated, and sulfur dioxide flue gas is fully absorbed generation zinc sulfite.Flue gas enters at the top of second motive force ripple washer reverse jet tube after washing, and zinc oxide slurries that inverse shower nozzle sprays upwards counter current contacting again, further scrubbing CO_2 are washed with second motive force ripple.
Step 3）, the cleaning solution in second motive force ripple washer circulating slot drained into first order kinetics ripple washer circulating slot, the cleaning solution in first order kinetics ripple washer circulating slot is drained into PH regulating tanks by the bypass of circulating pump branch pipe again, acidification is first carried out to cleaning solution in PH regulating tanks；
Step 4), the cleaning solution after acidified processing in PH regulating tanks squeezed into oxidizing tower by supporting delivery pump, continue oxidation reaction with the air that oxidation fan blasts, then drain into intermediate storage tank；
Step 5）, using filter pressing pump supporting in intermediate storage tank by step 4）Cleaning solution after middle oxidation reaction squeezes into diaphragm filter press, carries out separation of solid and liquid, obtains solid-state filter residue and crosses cleaner liquid；
Step 6）, by step 5）In cleaner liquid of crossing dechlorination groove is squeezed into by delivery pump, dechlorinated to crossing cleaner liquid, the cleaner liquid of crossing after dechlorination squeezes into filter press through the supporting delivery pump of groove that dechlorinates and carries out press filtration, obtains solid-state filter residue and crosses cleaner liquid；
Step 7）, by step 6）Solution after middle press filtration squeezes into zinc abstraction leaching system, synthetical recovery zinc.
Described step 1）The granularity of middle ZnO powder is 150~250 mesh, and wherein zinc oxide content is 75%.
Described step 1）Prepare cleaning solution proportioning according to：The ratio between the volume of the weight of ZnO powder with adding water is 5 tons~12 tons：100 cubic metres.
Described step 2）The pH value control of the middle cleaning solution for absorbing sulfur dioxide：The pH value control for the cleaning solution that first order kinetics ripple washer sprays against shower nozzle is 5.0~6.0, and the pH value control for the cleaning solution that second motive force ripple washer sprays against shower nozzle is 6.0~7.0.
Described step 2）In rinse water pipeline is set on pump discharge pipeline, flushing blowoff valve is set on pump inlet pipeline, to prevent cleaning solution pump and its pipe sedimentation from blocking.
Described step 2）Described in the washing of flue gas scrubbed liquid after, then by herringbone demister foam removal supporting in second motive force ripple after, chimney qualified discharge is discharged to by booster fan.
Described step 3）In acidification used in acid be sulfuric acid.
Described step 5）Described in solid-state filter residue be lead sulfate, zinc oxide, zinc sulfite, the impurity in raw material.
Described step 6）Described in cross cleaner liquid carry out dechlorination be using the copper ashes after autoxidation with excessively cleaner liquid chemically reacted in acid condition, acid is sulfuric acid.
The beneficial effects of the invention are as follows desulfuration efficiency to be up to 98%（Improve 10%）, desulphurization cost is low 60%, pipeline is not easily blocked, desulfurization product can comprehensive reutilization, without secondary pollution.
Brief description of the drawings
Fig. 1 is Zinc oxide desulfuration technology FB(flow block) of the present invention.
Embodiment
It is as follows the step of this method as shown in figure 1, a kind of zinc oxide desulfurization method suitable for zinc abstraction system：
Step 1）, by zinc abstraction system turn round Rotary Kiln caused by intermediate products ZnO powder zinc oxide intermediate bunker 2 is delivered to by the jet pump 1 that gasifies, the belt conveyer scale 3 by the installation of the bottom of intermediate bunker 2 and screw(-type) feeder 4 deliver to ZnO powder with stock tank 5 again, ZnO powder and water are mixedly configured into suspension in stock tank 5, by stirring, cleaning solution is obtained；
Step 2）, it will be squeezed into respectively in first order kinetics ripple washer circulating slot 9 and second motive force ripple washer circulating slot 6 with the cleaning solution prepared in stock tank 5 by delivery pump, cleaning solution is delivered to by the inverse shower nozzle in first order kinetics ripple washer circulating slot 9 and second motive force ripple washer circulating slot 6 by the circulating pump on first order kinetics ripple washer circulating slot 9 and second motive force ripple washer circulating slot 6 respectively again, via the cleaning solution that inverse shower nozzle sprays upwards turbulence froth zone is formed with the sulfur dioxide flue gas entered at the top of the reverse jet tube of first order kinetics ripple washer 8, foam interface is constantly updated, sulfur dioxide flue gas is fully absorbed generation zinc sulfite.Flue gas enters at the top of the reverse jet tube of second motive force ripple washer 7 after washing, the zinc oxide slurries sprayed upwards against shower nozzle with second motive force ripple washer 7 counter current contacting again, further scrubbing CO_2.
For cleaning solution in first order kinetics ripple washer circulating slot 9 and second motive force ripple washer circulating slot 6 while the rapid flushing of forced circulation is washed, which part absorbs the solid-state zinc sulfite of generation and the oxygen in flue gas carries out oxidation reaction（It can reach 70%）, generate solution of zinc sulfate；
Step 3）, the cleaning solution in second motive force ripple washer circulating slot 6 drained into first order kinetics ripple washer circulating slot 9, the cleaning solution in first order kinetics ripple washer circulating slot 9 is drained into PH regulating tanks 10 by the bypass of circulating pump branch pipe again, acidification is first carried out to cleaning solution in PH regulating tanks 10, the zinc oxide and sulfuric acid reaction generation solution of zinc sulfate of absorbing reaction are had neither part nor lot in during acidification；
Step 4), the cleaning solution after acidified processing in PH regulating tanks 10 squeezed into oxidizing tower 11 by supporting delivery pump, the air blasted with oxidation fan 16 continues oxidation reaction, then drains into medial launder 12；
Step 5）, using filter pressing pump supporting on medial launder 12 by step 4）Cleaning solution after middle oxidation reaction squeezes into diaphragm filter press 13, carries out separation of solid and liquid, obtains solid-state filter residue and crosses cleaner liquid；
Step 6）, by step 5）In cleaner liquid of crossing dechlorination groove 14 is squeezed into by delivery pump, dechlorinated to crossing cleaner liquid, the cleaner liquid of crossing after dechlorination squeezes into filter press 15 through the supporting delivery pump of groove 14 that dechlorinates and carries out press filtration, obtains that objectionable impurities is low, is not less than 80g/l solution containing zinc；
Step 7）, by step 6）Solution after middle press filtration squeezes into zinc abstraction leaching system, synthetical recovery zinc.
Described step 1）The granularity of middle ZnO powder is 150~250 mesh, and wherein zinc oxide content is 75%.
Described step 1）It is middle prepare cleaning solution proportioning according to：The ratio between the volume of the weight of ZnO powder with adding water is 5 tons~12 tons：100 cubic metres.
Described step 2）The pH value control of the middle cleaning solution for absorbing sulfur dioxide：The pH value control for the cleaning solution that first order kinetics ripple washer sprays against shower nozzle is 5.0~6.0, and the pH value control for the cleaning solution that second motive force ripple washer sprays against shower nozzle is 6.0~7.0.
Claims (1)
- A kind of 1. zinc oxide desulfurization method suitable for zinc abstraction system, it is characterised in that：This method The step of it is as follows：Step 1), by zinc abstraction system turn round Rotary Kiln caused by intermediate products ZnO powder pass through Gasification jet pump (1) is delivered to zinc oxide intermediate bunker (2), then by intermediate bunker (2) The belt conveyer scale (3) and screw(-type) feeder (4) of bottom installation deliver to ZnO powder with stock tank (5) in, ZnO powder and water are mixedly configured into suspension in stock tank (5), passed through Stirring is crossed, obtains cleaning solution；Step 2), the cleaning solution for preparing in stock tank (5) will be matched somebody with somebody by delivery pump squeeze into one-level respectively In dynamic wave scrubber circulating slot (9) and second motive force ripple washer circulating slot (6), then lead to Cross on first order kinetics ripple washer circulating slot (9) and second motive force ripple washer circulating slot (6) Circulating pump cleaning solution is delivered to first order kinetics ripple washer circulating slot (9) and two level respectively Inverse shower nozzle in dynamic wave scrubber circulating slot (6), the washing sprayed upwards via inverse shower nozzle Liquid is formed with the sulfur dioxide flue gas entered at the top of first order kinetics ripple washer (8) reverse jet tube Turbulence froth zone, foam interface are constantly updated, and sulfur dioxide flue gas is fully absorbed generation sulfurous Sour zinc；Flue gas enters at the top of second motive force ripple washer (7) reverse jet tube after washing, with two level The zinc oxide slurries that the inverse shower nozzle of dynamic wave scrubber (7) sprays upwards counter current contacting again, enters One-step removal sulfur dioxide；Step 3), the cleaning solution in second motive force ripple washer circulating slot (6) drained into first order kinetics Ripple washer circulating slot (9), then by the washing in first order kinetics ripple washer circulating slot (9) Liquid drains into PH regulating tanks (10) by the bypass of circulating pump branch pipe, in PH regulating tanks (10) Acidification is first carried out to cleaning solution；Step 4), the cleaning solution after acidified processing in PH regulating tanks (10) passed through into supporting conveying Pump squeezes into oxidizing tower (11), and it is anti-that the air blasted with oxidation fan (16) continues oxidation Should, then drain into medial launder (12)；Step 5), using filter pressing pump supporting on medial launder (12) by after oxidation reaction in step 4) Cleaning solution squeeze into diaphragm filter press (13), carry out separation of solid and liquid, obtain solid-state filter residue and mistake Cleaner liquid；Step 6), by step 5) cross cleaner liquid by delivery pump squeeze into dechlorination groove (14), it is right Cross cleaner liquid to be dechlorinated, cleaner liquid is crossed through the supporting delivery pump of groove (14) that dechlorinates after dechlorination Squeeze into filter press (15) and carry out press filtration, obtain objectionable impurities it is low, containing zinc not less than 80g/l Solution；Step 7), the solution after press filtration in step 6) is squeezed into zinc abstraction leaching system, synthetical recovery Zinc.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610443232.3A CN107519745A (en) | 2016-06-19 | 2016-06-19 | A kind of zinc oxide desulfurization method suitable for zinc abstraction system |
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| CN201610443232.3A CN107519745A (en) | 2016-06-19 | 2016-06-19 | A kind of zinc oxide desulfurization method suitable for zinc abstraction system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113462893A (en) * | 2021-07-22 | 2021-10-01 | 云南云铜锌业股份有限公司 | Zinc powder wet-adding device and method |
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2016
- 2016-06-19 CN CN201610443232.3A patent/CN107519745A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113462893A (en) * | 2021-07-22 | 2021-10-01 | 云南云铜锌业股份有限公司 | Zinc powder wet-adding device and method |
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Application publication date: 20171229 |