CN101289265A - Treating method for dezincifying from zinc-containing sludge of blast furnace - Google Patents
Treating method for dezincifying from zinc-containing sludge of blast furnace Download PDFInfo
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- CN101289265A CN101289265A CNA2007100397406A CN200710039740A CN101289265A CN 101289265 A CN101289265 A CN 101289265A CN A2007100397406 A CNA2007100397406 A CN A2007100397406A CN 200710039740 A CN200710039740 A CN 200710039740A CN 101289265 A CN101289265 A CN 101289265A
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Abstract
The invention discloses a zinc-removal treatment method of zinc-contained sludge in a blast furnace. The zinc-removal treatment method of the invention comprises the steps that (1) the determination of concentration is carried out for zinc-contained sludge of different material sources; (2) the concentration of the zinc-contained sludge is adjusted to a scope as required; (3) primary cyclone separation is conducted; and (4) secondary cyclone separation is carried out. The zinc-removal treatment method of the invention effectively overcomes the defect that the zinc-removal and separation effect of a cyclone separator is directly influenced by the change of industrial mines in the smelting of the blast furnace, the change of composition of raw materials and the change of the concentration of zinc-contained sludge after the sedimentation that exert impacts on a simple cyclone separation method. The zinc content of the sludge in the blast furnace is lowered below 0.2 percent and the zinc-contained sludge is directly recycled as iron-smelting raw material, which results in that the waste of resources can be avoided and the environmental pollution can also be reduced.
Description
Technical field
The present invention relates to a kind of treatment process of metallurgy industry zinc-containing sludge, be specifically related to a kind of method that dezincifying from zinc-containing sludge of blast furnace is handled.
Background technology
In the blast-furnace smelting production process, produce a large amount of dedusting of blast furnace gas ashes, through gravitational dust collection, secondary wet dust removal, post precipitation, form zinc-containing sludge, and contain compositions such as a large amount of iron, carbon in the zinc-containing sludge, can be used as good iron-smelting raw material resource.But owing to contain a certain amount of zinc composition in the zinc-containing sludge, directly recycle the standard that can surpass blast furnace feeding zinc amount, influence blast furnace ordinary production and work-ing life.For excavating its potential iron-smelting raw material resource and avoiding causing serious environmental pollution because of throwing aside zinc-containing sludge.
In the last few years, strengthened the technical study that dezincifying from zinc-containing sludge of blast furnace is handled both at home and abroad.Be applied to industrial dezincify method at present and mainly contained pyrotic smelting method, cyclonic separation method, magnetic method, flotation process and chemical extraction method etc.The facility investment of pyrotic smelting method is big, energy consumption and running cost height, maintenance difficulties are big, and has the secondary pollution problem; Magnetic method, flotation process and chemical extraction method etc. are because low to the rate of recovery that valence component is arranged in the mud, perhaps because floor space is big, operating environment is poor, operation and maintenance cost height, so all do not obtain wide popularization and application.And the cyclonic separation method has characteristics such as technology is simple, facility investment is few, oam is convenient, running cost is low, non-secondary pollution because of it, is subjected to common concern.
This processing method is carried out wet classification to the particle in the zinc-containing sludge of blast furnace by particle diameter, zinc-containing sludge of blast furnace is separated into fine grain high zinc mud and contains coarse grained low zinc mud, high zinc mud send cement mill, small furnace etc. to utilize after processed again, low zinc mud reclaims as iron-smelting raw material after vacuum hydroextractor is handled, and reaches waste decrement and resource reutilization purpose.But existing cyclonic separation method reclaims blast furnace mud its defective is arranged, when blast-furnace smelting industrial and mineral and composition of raw material were changed, adaptability was relatively poor, influences the dezincify effect of cyclonic separation method.Because use the cyclonic separation method its specific technical requirements is arranged, must (see Table the relation between 1 particle diameter and zinc content according to the particle characteristics of mud, zinc content is few in the macrobead, and zinc content is many in the small-particle) and the preceding sludge concentration of control charging, good dezincify separating effect just can be obtained.Otherwise application cyclonic separation method is carried out dezincify significant limitation is arranged.
Table 1 particle diameter and zinc content relation
| Particle diameter stepping (μ m) | Zinc content % |
| ＞76 | 0.142 |
| 76-50 | 0.188 |
| 50-30 | 0.115 |
| 30-10 | 0.126 |
| ≤10 | 1.463 |
The zinc-containing sludge that takes place when the Iron and Steel Enterprises in China blast-furnace smelting does not at present still carry out dezincify and handles, and contains directly discarded that zinc mud has, and promptly contaminate environment is wasted valuable iron-smelting raw material resource again.Processing does not also have the complete method that adaptability is strong, processing accuracy is high of a cover to dezincifying from zinc-containing sludge of blast furnace.
The objective of the invention is to: a kind for the treatment of method for dezincifying from zinc-containing sludge of blast furnace is provided, treating method for dezincifying from zinc-containing sludge of blast furnace of the present invention overcomes simple cyclonic separation method effectively because of being subjected to the variation of blast-furnace smelting industrial and mineral, material composition change and post precipitation zinc-containing sludge change in concentration etc., directly influences the defective of the dezincify separating effect of cyclone separator; Treating method for dezincifying from zinc-containing sludge of blast furnace of the present invention is reduced to the zinc content in the blast furnace mud below 0.2%, directly recycles as iron-smelting raw material, has both avoided the wasting of resources, has also reduced environmental pollution simultaneously.
Summary of the invention
The invention provides a kind for the treatment of method for dezincifying from zinc-containing sludge of blast furnace, described method comprises: (1) detects the concentration of different supplied materials zinc-containing sludges; (2) before flowing into concentration of hydraulic mixture adjustment groove, adjust zinc-containing sludge concentration in target zone 12-18%; (3) by the mud variable frequency pump mud is sent into a cyclone separator dezincify; (4) dilution of low zinc mud concentration; (5) secondary cyclonic separation.
For the zinc-containing sludge of blast furnace supplied materials, because of its concentration of hydraulic mixture random variation is very big, directly carries out dezincify and handle, can influence the dezincify effect of cyclonic separation, therefore need carry out the concentration of hydraulic mixture adjustment.Concentration detects and automatic its main purpose of thin up is that the zinc-containing sludge concentration of blast furnace supplied materials 10-35% random variation is adjusted in the needed concentration range automatically, the stable 12-18% that is controlled in.
According to treating method for dezincifying from zinc-containing sludge of blast furnace of the present invention, on settling tank to concentration is adjusted pipeline between the groove, install be used to measure zinc-containing sludge supplied materials concentration at the linear density instrument, because the specific gravity data of material (appearance matter) can detect in advance in the zinc-containing sludge, by the formula calculating concentration:
Concentration=y (1-x)/x (1-y)
Wherein: the x-solution density
The y-solute density
With the density value of the zinc-containing sludge that detects, be converted into the concentration (seeing Table 2) of zinc-containing sludge.
Table 2 concentration and density corresponding relation
| Concentration % | 10 | 12 | 15 | 18 | 25 | 30 | 35 | 40 |
| Density kg/m 3 | 1087 | 1106 | 1136 | 1168 | 1250 | 1316 | 1389 | 1471 |
According to treating method for dezincifying from zinc-containing sludge of blast furnace of the present invention, zinc-containing sludge concentration is adjusted, tie up to settling tank and to the pipeline between the concentration adjustment groove, one group of dilution water valve that connects service water is installed, described service water dilution water valve is opened service water automatically and is carried out mud, water mixing according to the concentration of hydraulic mixture data that detect.Detailed process is: send the zinc-containing sludge flow, the density signal (analog quantity) that detect to controller, controller will be carried out signal and send the dilution water flow to and take into account the dilution water flow adjustable valve that is installed on the service water pipeline, by variable valve by-pass valve control aperture, and adjust the dosage of dilution water automatically according to the zinc-containing sludge concentration of charging, reach and satisfy the concentration range requirement that zinc-containing sludge concentration sets.
According to treating method for dezincifying from zinc-containing sludge of blast furnace of the present invention, described concentration is adjusted in the groove and is provided with stirrer to prevent the mud sediment blocking pipe.
According to treating method for dezincifying from zinc-containing sludge of blast furnace of the present invention, described mud frequency transformer is liquid level and the flow automatic transmission running of adjusting groove according to concentration, to keep the balance of mud amount turnover, makes system be in the continuous operation state all the time.
According to treating method for dezincifying from zinc-containing sludge of blast furnace of the present invention, described zinc-containing sludge is sent to by the mud variable frequency pump before the cyclone separator, and pressure detecting instrument, concentration detector and the flow detector on the pipeline carries out pressure detection between concentration adjustment groove to No. time cyclone separator, concentration detects and flow detection by being installed on.
According to treating method for dezincifying from zinc-containing sludge of blast furnace of the present invention, described low zinc mud concentration dilution function, be that low zinc mud after the dezincify is dense, reach 60-70%, easy blocking pipe and equipment, cause system's operational failure, so to the pipeline between the cyclone separator, one group of low zinc mud concentration of the automatic dilution of dilution water valve that connects service water is installed, safeguards system steady running at low zinc pump.
According to treating method for dezincifying from zinc-containing sludge of blast furnace of the present invention, described secondary cyclonic separation, be dezincify efficient and the effective recycling that guarantees zinc-containing sludge, before zinc-containing sludge enters second separator, by being installed on once the pressure detecting instrument of low zinc mud storage tank to the pipeline between the secondary cyclone separator, concentration detector and flow detector carry out pressure detection, concentration detects and flow detection, reach the recovery requirement as the zinc content in the low zinc mud storage tank, then directly utilize vacuum hydroextractor to carry out reclaiming after the processed, as do not reach requirement, then carry out the dezincify of secondary cyclonic separation and handle.
The present invention, just the adjustment of inhomogenous zinc-containing sludge concentration is even with supplied materials, and concentration stabilize is controlled in the 12-18% scope.Use technical parameters such as concentration control, flow adjustment and pressure detection, zinc-containing sludge of blast furnace is carried out the cyclonic separation dezincify handle, reach the dezincify separating effect of high zinc mud, low zinc mud.To hang down zinc mud and recycle, reduce production costs, reduce discharging and guard ring environment pollution, improve the operating safety of blast-furnace smelting simultaneously, prolong the work-ing life of blast furnace as the iron-smelting raw material resource.
The simple declaration of accompanying drawing
Fig. 1 is a dezincifying from zinc-containing sludge processing flow chart of the present invention.
Embodiment
Below, with reference to accompanying drawing, more specific description the present invention.
Embodiment 1
Be depicted as a blast furnace dezincify processing technological flow, (1) representative is used to handle the settling tank of dedusting of blast furnace gas water, dedusting water is after precipitation process, the top clear water recycles, and the mud that precipitates is sent into concentration adjustment groove (4) by sludge pump (21), because the concentration of hydraulic mixture random variation of supplied materials is very big, variation range directly influences cyclonic separation dezincify efficient 10～35%.Adjust groove (4) before so advance concentration at mud, carrying out concentration (2) detects, according to the concentration of hydraulic mixture data that detect, automatically open service water dilution water valve (3), carry out mud, water mixing, flow into concentration of hydraulic mixture then and adjust groove (4), the concentration that turns round is simultaneously adjusted in the groove stirrer preventing the mud sediment blocking pipe, and by mud variable frequency pump (5) mud is sent into a cyclone separator (7) and carry out the dezincify processing.
Mud variable frequency pump (5) is liquid level and the flow automatic transmission running of adjusting groove according to concentration, to keep the balance of mud amount turnover, makes system be in the continuous operation state all the time.
A cyclone separator (7), its effect is carried out particle separation with the uniform mud of supplied materials concentration, the promptly low zinc mudflow of underflow mud after the separation is gone into following once low zinc mud storage tank (6), add service water in the once low zinc mud storage tank (6) and carry out concentration dilution, and mix by the running that stirrer is set in the low zinc mud storage tank (6) once, do not make the coarse particles mud sediment, be sent to secondary cyclone separator (9) or select switching valve (18) to send into vacuum hydroextractor (15) processing by once hanging down zinc pump (17) outlet selection switching valve (19) then.
Secondary cyclone separator (9) is according to the decision of the dezincify situation of a cyclone separator (7), after mud is handled through a dezincify, when its zinc content does not reach the blast furnace recovery index as yet, need further carry out dezincify handles, this moment, the mud logistics can select to enter dezincify for the second time, the mud zinc content is further reduced, reach the recovery requirement.Otherwise select vacuum hydroextractor (15) to carry out processed by switching valve (18).
Select secondary cyclone separator (9) to carry out dezincify, its function further reduces the zinc content in the mud, low zinc mudflow after the secondary dezincify is gone into the low zinc groove (10) of secondary, and will hang down zinc mud by the low zinc pump (11) of secondary and send into vacuum hydroextractor (15) processing, the low zinc mud after vacuum hydroextractor (15) is handled can be used as the iron-smelting raw material resource and is reclaimed.High and low zinc mud data see Table 3 after the dezincify.
Table 3 dezincify separates the high and low zinc dump analysis data in back
The top overflow mud of a cyclone separator (7) also claims high zinc mud to utilize overbottom pressure to flow into gravity thickener (8), high zinc mud carries out concentrating and precipitating, concentration and will concentrate mud through gravity thickener sludge pump (16) entering high zinc mud storage tank by gravity thickener (8), the stirrer that turns round simultaneously prevents high zinc mud precipitation.High zinc mud is sent into sheet frame water extracter (14) by high-pressure pump, low-pressure pump (13) and is carried out processed, to finish the processing of high zinc mud.
The inventive method comprises that using two online concentration meters measures zinc-containing sludge supplied materials concentration; One group of connection service water dilution water valve is installed on settling tank to the pipeline between the concentration adjustment groove, adjusts and follow the tracks of zinc-containing sludge concentration automatically; Zinc-containing sludge after the adjustment of concentration adjustment groove collection concentration, concentration is adjusted interior two stirrers that turn round automatically of groove and is prevented the mud sediment blocking pipe; Two frequency conversion slush pumps turn round automatically according to flow, liquid level change and keep the balance of mud amount turnover, make system be in the continuous operation state all the time; Pressure detecting instrument, concentration detector and flow detector are positioned on the pipeline that zinc-containing sludge is sent to cyclone separator, carry out pressure detection, concentration detects and flow detection; The automatic regulating valve that connects service water is installed on low zinc groove and is used for low zinc mud concentration dilution to the pipeline between the cyclone separator.
Treatment process of the present invention puts into operation in Baosteel one zinc-containing sludge of blast furnace project.
Flow detector: KROHNE, Q:0-80M3/H, I:4-20MA, P:1000HZ;
Pressure detecting instrument: the horizontal and rivers and creeks YOKOGAWA-EJA:138W in Chongqing;
Density tester: EMERSON-F200S.
Earlier the zinc-containing sludge with the blast furnace supplied materials carries out flow detection, then by being installed in the density that density instrument on the pipeline detects zinc-containing sludge, because the specific gravity data of material (appearance matter) can detect in advance in the zinc-containing sludge, by the formula calculating concentration:
Concentration=y (1-x)/x (1-y)
Wherein: the x-solution density
The y-solute density
With the density value of the zinc-containing sludge that detects, be converted into the concentration (seeing Table 2) of zinc-containing sludge.
Table 2 concentration and density corresponding relation
| Concentration % | 10 | 12 | 15 | 18 | 25 | 30 | 35 | 40 |
| Density kg/m 3 | 1087 | 1106 | 1136 | 1168 | 1250 | 1316 | 1389 | 1471 |
Send the zinc-containing sludge flow, the density signal (analog quantity) that detect to controller, controller will be carried out signal and send the dilution water flow to and take into account the dilution water flow adjustable valve that is installed on the service water pipeline, by variable valve by-pass valve control aperture, and adjust the dosage of dilution water automatically according to the zinc-containing sludge concentration of charging, reach and satisfy the concentration range requirement that zinc-containing sludge concentration sets.
Zinc-containing sludge after the concentration adjustment is sent into concentration adjust groove, for preventing sludgd deposition and playing the mud uniform mixing, the stirrer of automatic running is set in concentration is adjusted groove, and the frequency conversion slush pump can be according to the processing flow of road, back cyclone separator, liquid level change that concentration is adjusted groove and the automatic speed regulation running; The zinc-containing sludge of frequency conversion slush pump output is connected with one group of cyclone separator, bottom underflow mudflow after the cyclone separator dezincify is handled goes into to hang down zinc mud storage tank, because low zinc mud is dense, easy blocking pipe, must add water and dilute, therefore install one and connected the automatic regulating valve that service water is used to dilute low zinc mud concentration; The isolated high zinc mud in cyclone separator top, flow automatically to the gravity thickener, high zinc mud is after gravity thickener concentration, be transferred to a high zinc mud storage tank by slush pump, automatically the stirrer that turns round according to liquid level is set in high zinc mud storage tank, and by high-pressure pump, low-pressure pump the mud in the high zinc mud storage tank is sent into the sheet frame water extracter by pipeline and carry out processed, the high zinc mud cake after the dehydration is transported outward with car.
For guaranteeing that the low zinc mud after the dezincify reaches the recycling requirement, on treatment process, be provided with secondary eddy flow dezincify facility simultaneously, the stock pump that send that hangs down zinc mud storage tank is connected with the secondary cyclone separator with vacuum hydroextractor respectively by pipeline.Reach the recovery requirement as the zinc content in the low zinc mud storage tank, then directly utilize vacuum hydroextractor to carry out reclaiming after the processed, as do not reach requirement, then carry out the dezincify of secondary eddy flow and handle.The high zinc mud in top after the secondary cyclone separator is handled is sent into mud foldback hole by pipeline, the low zinc mudflow in bottom after the secondary cyclone separator separates is gone into the low zinc mud storage tank of following secondary, and by service water automatic regulating valve thin up, the low zinc mud after the dilution is sent into vacuum hydroextractor by slush pump and is carried out processed.
Contain zinc mud after over-richness adjustment, eddy flow dezincify separating treatment, reached the separation of high zinc mud, low zinc mud, the technical requirements that wherein low zinc mud zinc content on average reclaims less than 0.2% blast furnace, the system's dezincify rate and the mud rate of recovery see Table 4 all above more than 70%.
The table 4 dezincify rate and the rate of recovery
| Project | Rate of recovery % | Dezincify rate % |
| On average | 75％ | 85％ |
The present invention overcomes simple cyclonic separation method effectively and is subjected to the variation of blast-furnace smelting industrial and mineral, material composition change and post precipitation zinc-containing sludge change in concentration etc., directly influences the defective of the dezincify separating effect of cyclone separator.Just the adjustment of inhomogenous zinc-containing sludge concentration is even with supplied materials, and concentration stabilize is controlled in the 12-18% scope.Use technical parameters such as concentration control, flow adjustment and pressure detection, zinc-containing sludge of blast furnace is carried out the cyclonic separation dezincify handle, reach the separation of high zinc mud, low zinc mud.To hang down zinc mud and recycle, reduce production costs, reduce discharging and guard ring environment pollution, improve the operating safety of blast-furnace smelting simultaneously, prolong the work-ing life of blast furnace as the iron-smelting raw material resource.
Claims (8)
1, a kind for the treatment of method for dezincifying from zinc-containing sludge of blast furnace utilizes the cyclonic separation method that zinc-containing sludge of blast furnace is carried out dezincify, it is characterized in that this method comprises:
(1) concentration of the different supplied materials zinc-containing sludges of detection;
(2) before flowing into concentration of hydraulic mixture adjustment groove, adjust zinc-containing sludge concentration in target zone 12-18%;
(3) by the mud variable frequency pump mud is sent into a cyclone separator dezincify;
(4) dilution of low zinc mud concentration;
(5) secondary cyclonic separation.
2, treating method for dezincifying from zinc-containing sludge of blast furnace as claimed in claim 1, it is characterized in that, the concentration of the supplied materials zinc-containing sludge of above-mentioned (1) detects, tie up to settling tank to concentration adjust install on the pipeline between the groove be used to measure zinc-containing sludge supplied materials density at the linear density instrument, by the formula calculating concentration.
Concentration=y (1-x)/x (1-y)
Wherein: the x-solution density
The y-solute density
3, treating method for dezincifying from zinc-containing sludge of blast furnace as claimed in claim 1, it is characterized in that, the zinc-containing sludge concentration of above-mentioned (2) is adjusted, tie up to settling tank and to the pipeline between the concentration adjustment groove, one group of dilution water valve that connects service water is installed, described service water dilution water valve is opened service water automatically and is carried out mud, water mixing according to the concentration of hydraulic mixture data that detect.
4, treating method for dezincifying from zinc-containing sludge of blast furnace as claimed in claim 1 is characterized in that, the concentration of above-mentioned (2) is adjusted in the groove and is provided with stirrer to prevent the mud sediment blocking pipe.
5, treating method for dezincifying from zinc-containing sludge of blast furnace as claimed in claim 1, it is characterized in that, the mud frequency transformer of above-mentioned (3) is liquid level and the flow automatic transmission running of adjusting groove according to concentration, to keep the balance of mud amount turnover, makes system be in the continuous operation state all the time.
6, treating method for dezincifying from zinc-containing sludge of blast furnace as claimed in claim 1, it is characterized in that, the zinc-containing sludge of above-mentioned (3) is sent to before the cyclone separator, and pressure detecting instrument, concentration detector and the flow detector on the pipeline carries out pressure detection between concentration adjustment groove to No. time cyclone separator, concentration detects and flow detection by being installed on.
7, treating method for dezincifying from zinc-containing sludge of blast furnace as claimed in claim 1, it is characterized in that, the low zinc mud concentration dilution function of above-mentioned (4) ties up to low zinc pump and to the pipeline between the cyclone separator one group of low zinc mud concentration of the automatic dilution of dilution water valve that connects service water is installed.
8, treating method for dezincifying from zinc-containing sludge of blast furnace as claimed in claim 1, it is characterized in that, the secondary cyclonic separation of above-mentioned (5), tying up to zinc-containing sludge enters before the secondary cyclone separator, low zinc mud storage tank to pressure detecting instrument, concentration detector and flow detector on the pipeline between the secondary cyclone separator carries out pressure detection, concentration detects and flow detection by being installed on once, and zinc content does not reach to reclaim and requires then to carry out secondary separation in the low zinc mud groove.
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| CN104582856B (en) * | 2012-06-11 | 2018-03-27 | 弗吉尼亚理工大学知识产权公司 | The method for being separated and being dehydrated to fine grained |
| CN109183013A (en) * | 2018-10-25 | 2019-01-11 | 济南实达紧固件有限公司 | A kind of method that use mud cake containing zinc replaces zinc oxide to prepare phosphating solution |
| CN110328044A (en) * | 2019-08-15 | 2019-10-15 | 什邡鑫联环保科技有限公司 | A kind of method of blast furnace dust resource utilization |
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| US9789492B2 (en) | 2010-02-01 | 2017-10-17 | Virginia Tech Intellectual Properties, Inc. | Cleaning and dewatering fine coal |
| US10457883B2 (en) | 2010-02-01 | 2019-10-29 | Virginia Tech Intellectual Properties, Inc. | Method of separating and de-watering fine particles |
| US10562038B2 (en) | 2010-02-01 | 2020-02-18 | Virginia Tech Intellectual Properties, Inc. | Cleaning and dewatering fine coal |
| US10913912B2 (en) | 2010-02-01 | 2021-02-09 | Virginia Tech Intellectual Properties, Inc. | Methods for separating and dewatering fine particles |
| US11331676B2 (en) | 2010-02-01 | 2022-05-17 | Virginia Tech Intellectual Properties, Inc. | Cleaning and dewatering fine coal |
| CN104582856B (en) * | 2012-06-11 | 2018-03-27 | 弗吉尼亚理工大学知识产权公司 | The method for being separated and being dehydrated to fine grained |
| CN102749121A (en) * | 2012-07-17 | 2012-10-24 | 北京矿冶研究总院 | Online detection method for thickener mud-water interface height |
| CN109183013A (en) * | 2018-10-25 | 2019-01-11 | 济南实达紧固件有限公司 | A kind of method that use mud cake containing zinc replaces zinc oxide to prepare phosphating solution |
| CN110328044A (en) * | 2019-08-15 | 2019-10-15 | 什邡鑫联环保科技有限公司 | A kind of method of blast furnace dust resource utilization |
| CN112619886A (en) * | 2021-01-22 | 2021-04-09 | 太原钢铁(集团)有限公司 | Dust removal recycling system |
| CN112619886B (en) * | 2021-01-22 | 2022-05-27 | 太原钢铁(集团)有限公司 | Dust removal recycling system |
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