CN102389705B - Zinc oxide desulphurization system - Google Patents
Zinc oxide desulphurization system Download PDFInfo
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- CN102389705B CN102389705B CN2011103243459A CN201110324345A CN102389705B CN 102389705 B CN102389705 B CN 102389705B CN 2011103243459 A CN2011103243459 A CN 2011103243459A CN 201110324345 A CN201110324345 A CN 201110324345A CN 102389705 B CN102389705 B CN 102389705B
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Abstract
The invention discloses a zinc oxide desulphurization system comprising an absorption tower, a settling tank, a slurrying tank, an acidifying tank and a sulfur dioxide desorption tower, wherein the absorption tower is provided with an air inlet, an air outlet, an absorption liquid inlet and an absorption liquid outlet; the settling tank is communicated with the absorption liquid outlet; the slurrying tank is communicated with the settling tank, so that absorbent and supernatant liquor are sent to the absorption tower after being stirred; the acidifying tank is connected with a solid-contained slurry outlet of the settling tank; and the sulfur dioxide desorption tower is connected with the acidifying tank. According to the zinc oxide desulphurization system, by the control on the solid content and the pH value of the absorption liquid in the absorption tower, the problems of equipment blockage and scaling are obviously reduced and the absorption efficiency of SO2 is not influenced. In addition, without the discharge of any waste gas, waste liquid and waste solid, fully-closed operation is achieved. The equipment is simple, the operation and the maintenance are convenient and the cost is low; and compared with the traditional zinc oxide desulphurization, the zinc oxide desulphurization of the invention is short in process, convenient to operate and capable of realizing continuous operation.
Description
Technical field
The present invention relates to Zinc oxide desulfuration technology, especially relate to a kind of desulfurizing zinc oxide system.
Background technology
Traditional Zinc oxide desulfuration technology is as follows: contain slurries that the flue dust of zinc oxide (ZnO) or pure ZnO and water is mixed and contain sulfur dioxide (SO
2) the flue gas contact, react, generate zinc sulfite (ZnSO
3), ZnSO
3Precipitation is after the filter press press filtration, and the filter residue of formation send calcination department; Also have ZnSO
3In the situation that there is oxidation air to blast, oxidation reaction occurs, finally generate ZnSO
4, contain ZnSO
4, ZnSO
3, ZnO and impurity mixed solution, after Filter Press, contain a large amount of ZnSO in filtrate
4, be sent to the leaching section of wet method system.Filter residue is sent to slag disposal system or the roasting workshop section of zinc smeltery after super-dry.
Total chemical equation is as follows:
ZnO+SO
2-ZnSO
3
ZnO+SO
2+1/2O
2-ZnSO
4
But conventional oxidation zinc sulfur removal technology does not also have general popularization to open at home, traces it to its cause, roughly have following some:
(1) ZnSO
3Viscosity ratio is larger, the ZnSO in circulation fluid
3Be easy to deposit in equipment, pipeline, cause that Incrustation of pipe stops up, also very bad cleaning after fouling;
(2) ZnSO
3Be oxidized to ZnSO
4Need a large amount of oxidation airs to carry out oxidation, energy consumption is higher, and oxidation effectiveness is controlled by several factors, and oxidation efficiency is difficult to control;
(3) owing to there being a large amount of filter residues to filter out, and filter residue is difficult to accomplish that moisture content is very low, if filter bad, often filter residue is as sposh, make the non-constant of filter press factory building one deck operating environment, and these filter residues can't be accomplished totally-enclosed transportation in the process of outward transport, and plant area is caused secondary pollution;
(4) will be with ZnSO
4Solution and slag are separated, or with the ZnSO in slurries
3Filter out, all need filter press, and for continued operation, filter press must the using and the reserved, must arrange like this workman to operate and arrange filter cloth, and the slag that filters out must be transported, must build the filter press factory building, the whole system floor space is very large, and operating cost and investment are all very large;
On the whole, due to the tail gas desulfurization to enterprise, do not produce any benefit, so general investment is lower, equipment is more simple better, but conventional oxidation zinc sulfur removal technology, from zinc oxide slurrying, to follow-up Filter Press, all system scales are all little, but to allow a whole set of process operation is reliable and stable, good operational environment, automaticity be high, the auxiliary equipment such as this supporting electricity, instrument are all complete, and investment has often all surpassed enterprise's expection.The a lot of equipment of result just can be economized and economize, and just can simplify and simplify, and cause the extraordinary exemplary engineering of Zinc oxide desulfuration technology neither one, can't generally promote.
Summary of the invention
The present invention is intended to solve at least one of technical problem that exists in prior art.For this reason, one object of the present invention is to propose a kind of desulfurizing zinc oxide system, be difficult for during described desulfurizing zinc oxide system desulfurization producing stopping up fouling, and without any waste gas, waste liquid and useless solid discharging.
A kind of desulfurizing zinc oxide system according to the embodiment of the present invention, comprise: absorption tower, limit reaction chamber in described absorption tower, and the lower sidewall on described absorption tower is provided with air inlet and is provided with gas outlet with the top of sending into sulfur-containing smoke gas and described absorption tower, and the bottom that the side wall upper part on described absorption tower is provided with absorption liquid import and described absorption tower is provided with the absorption liquid outlet; Subsider, described subsider is communicated with to receive from described absorption liquid and exports the absorption liquid of output and stir the described absorption liquid of sedimentation with described absorption liquid outlet, the top of described subsider is formed with supernatant outlet and overflows with the supernatant with after sedimentation, the bottom of described subsider be formed with for discharge solid content after sedimentation be 30～50% slurries contain the outlet of stereoplasm liquid; Slurrying tank, described slurrying tank is communicated with to receive the supernatant that overflows from described subsider with described subsider, the top of described slurrying tank is provided with the absorbent entrance to add the absorbent that contains zinc oxide, and described absorbent and described supernatant are sent in described absorption tower after stirring; The acidifying groove, to be connected to receive described solid content be 30～50% slurries in the stereoplasm liquid outlet that contains of described acidifying groove and described subsider, the top of described acidifying groove is provided with waste acid liquor entrance and gas vent, and the lower sidewall of described acidifying groove is provided with the outlet of acidifying slurries; The sulfur dioxide desorption tower, described sulfur dioxide desorption tower is the void tower with the one-level spraying layer, the slurries that the desorption tower upside has acidifying slurries entrance to be connected with described acidifying groove and to flow out after acidifying groove internal reaction to receive, the top of described sulfur dioxide desorption tower are provided with the sulfur dioxide outlet, bottom is provided with the slurries outlet and sidewall is provided with air intake.
According to the desulfurizing zinc oxide system of the embodiment of the present invention, the solid content of the absorption liquid by controlling the circulation in absorption tower, not higher than 8%, stops up and scale problems thereby reduced significantly equipment.Lower solid content can reduce fouling, the blockage problem of equipment, pipeline, reduces simultaneously wearing and tearing, improves service life.And after the solid content reduction, as long as the pH value of controlling the absorption liquid in absorption tower, greater than 5.2, can not have influence on SO
2Absorption efficiency.In addition, because absorbent is that zinc is smelted calcining or electric dirt, usually do not need to buy from outside, the zinc sulfate slurries that when sulfur dioxide gas is conveyed to relieving haperacidity, acidifying obtains are conveyed to zinc and smelt leaching system, saved the cost of material in each system, and, without any waste gas, waste liquid and useless solid discharging, realized zero-emission in whole system, met the demand of environmental protection.In addition, equipment is simple, and convenient operation and maintenance and cost are low, compares the desulfurization of conventional oxidation zinc, and flow process is short and easy to operate, can realize continuous operation.
In addition, also have following additional technical feature according to desulfurizing zinc oxide system of the present invention:
Described desulfurizing zinc oxide system further comprises the first scraper component, described the first scraper component comprises: first scrapes plate, described first scrape plate rotatably be located in described subsider with the solid matter that will be deposited on the subsider bottom scrape make solids mass-energy pass through told and contain the outlet of stereoplasm liquid and discharge; With the first drive unit, it is rotatable that plate is scraped in described the first drive unit driving described first.
Wherein said subsider comprises: the column section; With the taper section, described taper section is connected to the below of described column section while form the inverted cone shape, wherein saidly contains stereoplasm liquid outlet and is formed on the bottom of described taper section, thereby make the sedimentation of being more convenient for of solid matter in slurries.
Described desulfurizing zinc oxide system further comprises: the first valve, described the first valve are located at the flow with the slurries of controlling described solid content 30%～50% of containing between stereoplasm liquid outlet and described acidifying groove of described subsider.
Described desulfurizing zinc oxide system further comprises the first mixing component, and described the first mixing component comprises: the first stirring parts, described the first stirring parts rotatably are located in described slurrying tank and stir with described absorbent and supernatant in described slurrying tank; With the second drive unit, it is rotatable that described the second drive unit drives described the first stirring parts.
Described desulfurizing zinc oxide system further comprises the second mixing component, described the second mixing component comprises: the second stirring parts, described the second stirring parts rotatably are located in described acidifying groove and stir and react with the described solid impurity in described acidifying groove and waste acid liquor; With the 3rd drive unit, it is rotatable that described the 3rd drive unit drives described the second stirring parts.Described desulfurizing zinc oxide system further comprises:
The downstream that the first pump, described the first pump are connected to described absorption tower is conveyed in described subsider with a part of absorption liquid with in described absorption tower and another part absorption liquid is sent in absorption tower by absorption liquid import circulation; The second pump, described the second pump are connected between described slurrying tank and described absorption tower and are used for fresh absorbent slurry is sent into absorption tower; With the 3rd pump, described the 3rd pump is connected between described acidifying groove and sulfur dioxide desorption tower, is used for slurries in the acidifying groove are sent into the sulfur dioxide desorption tower.
Described desulfurizing zinc oxide system further comprises: the second valve, described the second valve are located between described the first pump and described subsider, to control the flow that is pumped into the absorption liquid in subsider from absorption tower.
Described desulfurizing zinc oxide system also comprises: remove slurries outlet after free sulfur dioxide in the 4th pump, described the 4th pump and described sulfur dioxide desorption tower and be connected with the slurries with flowing out in described sulfur dioxide desorption tower and send.
Described absorption tower is void tower.
Desulfurizing zinc oxide system according to the embodiment of the present invention, with calcining or roasted dust of zinc as absorbent, end product can be got back to again the wet-leaching system that zinc is smelted, realized without any waste discharge, and the solid content in absorption liquid is low, can solve pipeline and equipment and stop up and scale problems.in addition, compare conventional oxidation zinc desulphurization system, saved oxidation fan according to the desulfurizing zinc oxide system of the embodiment of the present invention, absorption tower side entering type agitator, the equipment such as filter press, and do not produce extra waste residue in desulfurizer, do not need again the arrangement personnel go operation and muck haulage, power consumption, maintenance cost, operating cost is lower, equipment is simple, flow process is short, easy to operate, can realize continuous operation, in acidization, can carry out comprehensive reutilization to the Waste Sulfuric Acid of full factory again, make the integrated artistic power consumption, operating cost, overall investment is lower.
Additional aspect of the present invention and advantage part in the following description provide, and part will become obviously from the following description, or by practice of the present invention, recognize.
Description of drawings
Above-mentioned and/or additional aspect of the present invention and advantage are from obviously and easily understanding becoming the description of embodiment in conjunction with following accompanying drawing, wherein:
Fig. 1 is the schematic diagram according to the desulfurizing zinc oxide system of the embodiment of the present invention; With
Fig. 2 is the process chart that adopts the zinc oxide desulfurization method of the desulfurizing zinc oxide system shown in Fig. 1.
The specific embodiment
Below describe embodiments of the invention in detail, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or the element with identical or similar functions from start to finish.Be exemplary below by the embodiment that is described with reference to the drawings, only be used for explaining the present invention, and can not be interpreted as limitation of the present invention.
In description of the invention, it will be appreciated that, term " on ", orientation or the position relationship of the indications such as D score, " left side ", " right side ", " top ", " end ", " interior ", " outward " be based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, rather than indicate or hint that the device of indication or element must have specific orientation, with specific orientation, construct and operation, therefore can not be interpreted as limitation of the present invention.In addition, term " first ", " second " etc. only are used for describing purpose, and can not be interpreted as indication or hint relative importance.
In description of the invention, need to prove, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection " should be done broad understanding, for example, can be to be fixedly connected with, and can be also to removably connect, or connect integratedly; Can be directly to be connected, also can indirectly be connected by intermediary, can be the connection of two element internals.For the ordinary skill in the art, can concrete condition understand above-mentioned term concrete meaning in the present invention.
Below with reference to a kind of desulfurizing zinc oxide system of Fig. 1 description according to the embodiment of the present invention.
Desulfurizing zinc oxide system according to the embodiment of the present invention comprises: absorption tower 1, subsider 2, slurrying tank 3, acidifying groove 4 and sulfur dioxide desorption tower 5.As shown in Figure 1, absorption tower 1 limits reaction chamber for void tower and inside, and the lower sidewall on absorption tower 1 is provided with air inlet 11 in order to send into sulfur-containing smoke gas, and the top on absorption tower 1 is provided with gas outlet 12, and the side wall upper part on absorption tower 1 is provided with absorption liquid import 13 and bottom is provided with absorption liquid outlet 14.Alternatively, absorption liquid import 13 is at least two that are spaced apart from each other, and is connected with a plurality of absorption liquid spouts 15 in order to spray the absorption liquid that contains zinc oxide (ZnO) in the reaction chamber on absorption tower 1 in each absorption liquid import 13.Thus, sulfur-containing smoke gas enters in absorption tower 1 from air inlet 11, the absorption liquid that contains zinc oxide (ZnO) from absorption liquid import 13 enter into the interior downward motion in absorption tower 1 and with the sulfur-containing smoke gas that upwards flows on absorption tower the 1 reverse sulphur that contacts to remove sulfur-containing smoke gas, and control the solid content of the circulating absorption solution in absorption tower 1 in 8%, and the interior pH value of control absorption tower circulating absorption solution is greater than 5.2.
Subsider 2 and absorption liquid outlet 14 is communicated with to receive from the absorption liquids of absorption liquid outlet 14 outputs and stirs the sedimentation absorption liquid to obtain supernatant and solid impurity, wherein contains ZnSO in solid impurity
3, unreacted ZnO and do not participate in a large number impurity in the absorption liquid that reacts completely.Wherein the top of subsider 2 is formed with supernatant outlet 21 and overflows with the supernatant with after sedimentation, and the bottom of subsider 2 is formed with and contains stereoplasm liquid outlet 22 for the slurries of discharging the solid content 30%～50% after sedimentation.
Slurrying tank 3 is communicated with to receive the supernatant that overflows from subsider 2 with subsider 2, particularly, be provided with supernatant entrance 32 to receive supernatant above slurrying tank 3, the top of slurrying tank 3 is provided with absorbent entrance 31 to add the absorbent that contains zinc oxide (ZnO), and absorbent and supernatant are sent in absorption tower 1 after stirring pulp.Particularly, be provided with absorbent outlet 33 in the bottom of slurrying tank 3, export 33 by absorbent after absorbent and supernatant stirring pulp and discharge and be recycled in absorption tower 1, therefore make according to the desulfurizing zinc oxide system of the embodiment of the present invention and discharge without any waste solid impurity.Alternatively, the described absorbent that contains zinc oxide is calcining and/or the flue dust that sulfuric acid obtains, and its zinc oxide content is all higher than 50%.Wherein the one of ordinary skilled in the art knows, and zinc calcine is the product of zinc concentrate gained after roasting, mainly contains zinc oxide (ZnO), zinc sulfate (ZnSO
4), zinc sulphide (ZnS) etc.
Acidifying groove 4 is connected with the stereoplasm liquid outlet 22 that contains of subsider 2, particularly, is provided with impurity entrance 44 at the top of acidifying groove 4 to receive the slurries of solid content 30%～50%, contains a large amount of ZnSO in these slurries
3, unreacted ZnO and do not participate in a large number solid impurities in the absorption liquid that reacts completely.The top of acidifying groove 4 is provided with for the waste acid liquor entrance 41 that feeds Waste Sulfuric Acid, and Waste Sulfuric Acid is for producing the spent acid that produces in sulfate system and wherein being mixed with the materials such as flue dust, arsenic, mercury, fluorine, chlorine.The top of acidifying groove 4 also is provided with for the gas vent 42 of discharging sulfur dioxide gas, and the lower sidewall of acidifying groove 4 is provided with acidifying slurries outlet 43, and thus, Waste Sulfuric Acid and solid impurity react generation SO in acidifying groove 4
2Gas and contain ZnSO
4The acidifying slurries of solution.Regulate the pH value of acidifying slurries in acidifying groove 4, and liquid-solid ratio, making these slurries can meet the requirement of leaching system in wet method is that liquid-solid ratio is 8-10: 1, pH value is 5.0-5.2.
Sulfur dioxide desorption tower 5 is connected with acidifying groove 4 and is the void tower with the one-level spraying layer, particularly, be provided with acidifying slurries entrance 54 on the top of sulfur dioxide desorption tower 5 to receive the acidifying slurries that flow out after acidifying groove 4 internal reactions, the top of sulfur dioxide desorption tower 5 is provided with sulfur dioxide outlet 51, bottom is provided with slurries outlet 52 and sidewall is provided with air intake 53, with the acidifying slurries with air interior reverse the contact with the SO in desorption acidifying slurries of sulfur dioxide desorption tower 5
2And obtain desorption SO
2After slurries, these slurries are sent to leaching system.The sulfur dioxide gas of discharging in acidifying groove 4 and sulfur dioxide desorption tower 5 simultaneously is fed in sulfate system and carries out relieving haperacidity.
According to the desulfurizing zinc oxide system of the embodiment of the present invention, the solid content of the absorption liquid by controlling the circulation in absorption tower 1, not higher than 8%, stops up and scale problems thereby reduced significantly equipment.Lower solid content can reduce fouling, the blockage problem of equipment, pipeline, reduces simultaneously wearing and tearing, improves service life.And after the solid content reduction, as long as the pH value of controlling the absorption liquid in absorption tower 1, greater than 5.2, can not have influence on SO
2Absorption efficiency.In addition, because absorbent is that zinc is smelted calcining or electric dirt, usually do not need to buy from outside, the zinc sulfate slurries that when sulfur dioxide gas is conveyed to relieving haperacidity, acidifying obtains are conveyed to zinc and smelt leaching system, saved the cost of material in each system, and, without any waste gas, waste liquid and useless solid discharging, realized zero-emission in whole system, met the demand of environmental protection.In addition, equipment is simple, and convenient operation and maintenance and cost are low, compares the desulfurization of conventional oxidation zinc, and flow process is short and easy to operate, can realize continuous operation.
As shown in Figure 1, according to one embodiment of present invention, desulfurizing zinc oxide system further comprises the first scraper component 61, the first scraper component 61 comprises that first scrapes plate 611 and the first drive unit 612, wherein first scrape plate 611 and rotatably be located in subsider 2 and scrape solid matter can be discharged by containing stereoplasm liquid outlet 22 with the solid matter that will be deposited on subsider 2 bottoms, the first drive unit 612 drives first, and to scrape plate 611 rotatable.
Alternatively, as shown in fig. 1, subsider 2 comprises column section 20a and taper section 20b, taper section 20b is connected to the below of column section 20a and forms the inverted cone shape, thereby make solid impurity in the slurries of solid content 30%～50% be more convenient for sedimentation and discharge, wherein contain stereoplasm liquid outlet 22 and be formed on the bottom of taper section 20b.
In further embodiment of the present invention, desulfurizing zinc oxide system also comprises the first valve 71, the first valve 71 is located at the flow of discharging from subsider 2 with the slurries of controlling solid content 30%～50% between the outlet 22 of stereoplasm liquid and acidifying groove 4 that contains of subsider 2, as shown in Figure 1.
According to one embodiment of present invention, desulfurizing zinc oxide system also further comprises the first mixing component 62 and the 3rd mixing component 63.The first mixing component 62 comprises the first stirring parts 621 and the second drive unit 622, wherein the first stirring parts 621 rotatably is located in slurrying tank 3 and stirs with absorbent and supernatant in slurrying tank 3, and it is rotatable that the second drive unit 622 drives the first stirring parts 621.
The second mixing component 63 comprises the second stirring parts 631 and the 3rd drive unit 632, wherein the second stirring parts 631 rotatably is located in acidifying groove 4 and stirs and react with slurries and waste acid liquor to the interior solid content 30%～50% of acidifying groove 4, and it is rotatable that the 3rd drive unit 632 drives the second stirring parts 631.
Desulfurizing zinc oxide system further comprises: the first pump 81, the second pump 82 and the 3rd pump 83, the downstream that the first pump 81 is connected to absorption tower 1 is conveyed in subsider 2 with a part of absorption liquid with in absorption tower 1 and another part absorption liquid is sent in absorption tower 1 by absorption liquid import 13 circulations, the second pump 82 is connected between slurrying tank 3 and absorption tower 1 and is connected between acidifying groove 4 and sulfur dioxide desorption tower 5 for the interior slurries of acidifying groove 4 are sent into sulfur dioxide desorption tower 5 for fresh absorbent slurry being sent into absorption tower 1, the three pump 83.
Alternatively, as shown in Figure 1, also be provided with the second valve 72 between the first pump 81 and subsider 2, to control, be pumped into the flow of the absorption liquid in subsider 2 from absorption tower 1.
As shown in Figure 1, desulfurizing zinc oxide system also can comprise in the 4th pump 84, the four pumps 84 and sulfur dioxide desorption tower 5 that it is the wet-leaching system that the slurries outlet 52 that removes after free sulfur dioxide is connected so that the slurries of outflow in sulfur dioxide desorption tower 5 are sent to next step operation.
The Zinc oxide desulfuration technology of the desulfurizing zinc oxide system that adopts the embodiment of the present invention is described below with reference to Fig. 1 and Fig. 2.
Described Zinc oxide desulfuration technology comprises the following steps:
S1, with sulfur-containing smoke gas and the absorption liquid that contains zinc oxide reverse sulphur in contacting to remove sulfur-containing smoke gas in absorption tower 1.
S2, the absorption liquid after desulfurization is transported in subsider 2 and carries out sedimentation and obtain slurries and the supernatant of solid content 30%～50%, wherein contain ZnSO in the slurries of solid content 30%～50%
3, unreacted ZnO and do not participate in a large number solid impurities in the absorption liquid that reacts completely.
S3, be transmitted back in absorption tower 1 supernatant and the absorbent that contains zinc oxide are stirred pulp in slurrying tank 3 after, alternatively, the described absorbent that contains zinc oxide is calcining and/or the flue dust that sulfuric acid obtains.
S4, solid impurity and waste acid liquor are reacted and generate SO in acidifying groove 4
2And the acidifying slurries, contain zinc sulfate ZnSO in the acidifying slurries
4Solution.
S5, with the acidifying slurries with air interior reverse the contact with the SO in desorption acidifying slurries of sulfur dioxide desorption tower 5
2And obtain desorption SO
2After slurries.
S6, with the SO that generates in step S4
2With the SO that generates in step S5
2Relieving haperacidity.
Wherein, with desorption SO
2After the liquid-solid ratio of slurries be controlled to be 8-10: 1, pH value is controlled to be 5.0-5.2 to be used for wet-leaching, for example can, by being controlled at liquid-solid ratio and the pH value of the acidifying slurries in the acidifying groove in step S4, reach desorption SO
2After the liquid-solid ratio of slurries be controlled to be 8-10: 1, pH value is controlled to be 5.0-5.2.
Control the solid content of described absorption liquid not higher than 8% in step S1, thereby can reduce ZnSO
3Content, and then reduced significantly that equipment stops up and scale problems.Lower solid content can reduce fouling, the blockage problem of equipment, pipeline, reduces simultaneously wearing and tearing, improves service life.Further, after solid content reduces in step S1, control the pH value of absorption liquid greater than 5.2, can not have influence on SO
2Absorption efficiency.
Alternatively, the absorption liquid that is transported to absorption tower in from the bottom on absorption tower sulfur-containing smoke gas and will contains zinc oxide is transported in absorption tower from the top on absorption tower.Wherein, the calcining that obtained by sulfuric acid of the described absorption liquid that contains zinc oxide and/or flue dust and water mix.
In examples more of the present invention, absorption tower 1 and sulfur dioxide desorption tower 5 are void tower, and equipment is simple, and convenient operation and maintenance and cost are low.
Below with reference to Fig. 1 and Fig. 2, sweetening process according to the desulfurizing zinc oxide system of the embodiment of the present invention is described.
Sulfur-containing smoke gas enters in absorption tower 1 from air inlet 11, the absorption liquid that contains zinc oxide (ZnO) from absorption liquid import 13 enter into the interior downward motion in absorption tower 1 and with the sulfur-containing smoke gas that upwards flows on absorption tower 1 reverse the contact, sulfur dioxide and zinc oxide (ZnO) that absorption liquid is drawn in sulfur-containing smoke gas react, and generate ZnSO
3Or zine hydrosulfite Zn (HSO
3)
2, in order to prevent ZnSO
3Scale problems, control the solid content of the circulating absorption solution in absorption tower 1, make solid content not higher than 8%, and the interior pH value of controlling the absorption tower circulating absorption solution is greater than 5.2.After reacting completely, absorption liquid is discharged absorption tower 1 from absorption liquid outlet 14, and wherein a part of absorption liquid is admitted in subsider 2 and stirs sedimentation by the first pump 81, and another part again circulates and absorbs in absorption tower 1 by absorption liquid import 13.
Be sent to a part of absorption liquid in subsider 2, by the stirring settlement action of the first mixing component 61, with ZnSO
3, unreacted ZnO and in a large number do not participate in the calcining impurity that reacts and settle down in the lump completely, the underflow solid content of subsider 2 is controlled at 30～50%, the slurries of solid content 30%～50% can flow automatically in acidifying groove 4 by containing stereoplasm liquid outlet 22 thus, and supernatant flows out by the supernatant outlet 22 of subsider 2 and the supernatant entrance by slurrying tank 3 flow in slurrying tank 3.
The absorbent that contains zinc oxide (ZnO) is input to the absorbent entrance 31 of slurrying tank 3 and then joins in slurrying tank 3 by charging system (scheming not shown), after slurrying tank 3 inner absorbents and supernatant stirring pulp, by the second pump 82, be sent in absorption tower 1 to form the absorption liquid of circulation.
The a large amount of ZnSO that contain that contain stereoplasm liquid outlet 22 outflows from subsider 2
3, the solid impurity such as ZnO the slurries of solid content 30%～50% enter in acidifying groove 4, the Waste Sulfuric Acid that is mixed with the materials such as flue dust, arsenic, mercury, fluorine, chlorine enters in acidifying groove 4 by waste acid liquor entrance 41, solid impurity and Waste Sulfuric Acid react, and generate SO
2And contain ZnSO
4The slurries of solution, wherein stir accelerated reaction by the 3rd mixing component 63.Regulate pH value and the liquid-solid ratio of acidifying slurries in acidifying groove 4, making final slurries can meet the requirement of leaching system in wet method is that liquid-solid ratio is 8-10: 1, pH value is 5.0-5.2.
The acidifying slurries of from the acidifying slurries outlet 43 of acidifying groove 4, discharging enter into sulfur dioxide desorption tower 5 by acidifying slurries entrance 54, air enters into sulfur dioxide desorption tower 5 from air intake 53, thus the acidifying slurries with air interior reverse the contact with the SO in desorption acidifying slurries of sulfur dioxide desorption tower 5
2And obtain desorption SO
2After slurries, these slurries are sent to leaching system.The sulfur dioxide gas of discharging in acidifying groove 4 and sulfur dioxide desorption tower 5 simultaneously is fed in sulfate system and carries out relieving haperacidity.
Desulfurizing zinc oxide system according to the embodiment of the present invention, with calcining or roasted dust of zinc as absorbent, end product can be got back to again the wet-leaching system that zinc is smelted, realized without any waste discharge, and the solid content in absorption liquid is low, can solve pipeline and equipment and stop up and scale problems.in addition, compare conventional oxidation zinc desulphurization system, saved oxidation fan according to the desulfurizing zinc oxide system of the embodiment of the present invention, absorption tower side entering type agitator, the equipment such as filter press, and do not produce extra waste residue in desulfurizer, do not need again the arrangement personnel go operation and muck haulage, power consumption, maintenance cost, operating cost is lower, equipment is simple, flow process is short, easy to operate, can realize continuous operation, in acidization, can carry out comprehensive reutilization to the Waste Sulfuric Acid of full factory again, make the integrated artistic power consumption, operating cost, overall investment is lower.
In the description of this specification, the description of reference term " embodiment ", " some embodiment ", " illustrative examples ", " example ", " concrete example " or " some examples " etc. means to be contained at least one embodiment of the present invention or example in conjunction with specific features, structure, material or the characteristics of this embodiment or example description.In this manual, the schematic statement of above-mentioned term not necessarily referred to identical embodiment or example.And the specific features of description, structure, material or characteristics can be with suitable mode combinations in any one or more embodiment or example.
Although illustrated and described embodiments of the invention, those having ordinary skill in the art will appreciate that: in the situation that do not break away from principle of the present invention and aim can be carried out multiple variation, modification, replacement and modification to these embodiment, scope of the present invention is limited by claim and equivalent thereof.
Claims (10)
1. a desulfurizing zinc oxide system, is characterized in that, comprising:
Absorption tower, limit reaction chamber in described absorption tower, and the lower sidewall on described absorption tower is provided with air inlet and is provided with gas outlet with the top of sending into sulfur-containing smoke gas and described absorption tower, and the bottom that the side wall upper part on described absorption tower is provided with absorption liquid import and described absorption tower is provided with the absorption liquid outlet;
Subsider, described subsider is communicated with to receive from described absorption liquid and exports the absorption liquid of output and stir the described absorption liquid of sedimentation with described absorption liquid outlet, the top of described subsider is formed with the supernatant outlet and overflows with the supernatant with after sedimentation, and the stereoplasm liquid that contains that the bottom of described subsider is formed with for the slurries of the solid content 30%～50% after the discharge sedimentation exports;
Slurrying tank, described slurrying tank is communicated with to receive the supernatant that overflows from described subsider with described subsider, the top of described slurrying tank is provided with the absorbent entrance to add the absorbent that contains zinc oxide, and described absorbent and described supernatant are sent in described absorption tower after stirring;
The acidifying groove, described acidifying groove is connected to receive the slurries of described solid content 30%～50% with the stereoplasm liquid outlet that contains of described subsider, the top of described acidifying groove is provided with waste acid liquor entrance and gas vent, and the lower sidewall of described acidifying groove is provided with the outlet of acidifying slurries;
The sulfur dioxide desorption tower, described sulfur dioxide desorption tower is the void tower with the one-level spraying layer, the slurries that the desorption tower upside has acidifying slurries entrance to be connected with described acidifying groove and to flow out after acidifying groove internal reaction to receive, the top of described sulfur dioxide desorption tower are provided with the sulfur dioxide outlet, bottom is provided with the slurries outlet and sidewall is provided with air intake.
2. desulfurizing zinc oxide system according to claim 1, is characterized in that, further comprises the first scraper component, and described the first scraper component comprises:
First scrapes plate, and described first scrapes plate rotatably is located in described subsider with the solid matter that will be deposited on the subsider bottom and scrapes and make solid matter contain the outlet of stereoplasm liquid and discharge by described; With
The first drive unit, it is rotatable that plate is scraped in described the first drive unit driving described first.
3. desulfurizing zinc oxide system according to claim 2, is characterized in that, described subsider comprises:
The column section; With
Taper section, described taper section are connected to the below of described column section and form the inverted cone shape, and the wherein said stereoplasm liquid that contains exports the bottom that is formed on described taper section.
4. desulfurizing zinc oxide system according to claim 1, is characterized in that, further comprises:
The first valve, described the first valve are located at the flow with the slurries of controlling described solid content 30%～50% of containing between stereoplasm liquid outlet and described acidifying groove of described subsider.
5. desulfurizing zinc oxide system according to claim 2, is characterized in that, further comprises the first mixing component, and described the first mixing component comprises:
The first stirring parts, described the first stirring parts rotatably are located in described slurrying tank and stir with described absorbent and supernatant in described slurrying tank; With
The second drive unit, it is rotatable that described the second drive unit drives described the first stirring parts.
6. desulfurizing zinc oxide system according to claim 5, is characterized in that, further comprises the second mixing component, and described the second mixing component comprises:
The second stirring parts, described the second stirring parts rotatably are located in described acidifying groove and stir and react with the described solid impurity in described acidifying groove and waste acid liquor; With
The 3rd drive unit, it is rotatable that described the 3rd drive unit drives described the second stirring parts.
7. desulfurizing zinc oxide system according to claim 1, is characterized in that, further comprises:
The downstream that the first pump, described the first pump are connected to described absorption tower is conveyed in described subsider with a part of absorption liquid with in described absorption tower and another part absorption liquid is sent in absorption tower by absorption liquid import circulation;
The second pump, described the second pump are connected between described slurrying tank and described absorption tower and are used for fresh absorbent slurry is sent into absorption tower; With
The 3rd pump, described the 3rd pump are connected between described acidifying groove and sulfur dioxide desorption tower, are used for slurries in the acidifying groove are sent into the sulfur dioxide desorption tower.
8. desulfurizing zinc oxide system according to claim 7, is characterized in that, further comprises:
The second valve, described the second valve is located between described the first pump and described subsider.
9. desulfurizing zinc oxide system according to claim 7, is characterized in that, also comprises:
Removing slurries outlet after free sulfur dioxide in the 4th pump, described the 4th pump and described sulfur dioxide desorption tower is connected with the slurries with flowing out in described sulfur dioxide desorption tower and sends.
10. the described desulfurizing zinc oxide system of any one according to claim 1-9, is characterized in that, described absorption tower is void tower.
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| CN2011103243459A CN102389705B (en) | 2011-10-21 | 2011-10-21 | Zinc oxide desulphurization system |
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| CN2011103243459A CN102389705B (en) | 2011-10-21 | 2011-10-21 | Zinc oxide desulphurization system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102698588B (en) * | 2012-05-04 | 2014-08-06 | 杭州三耐环保科技有限公司 | Control method for desulfuration treatment of zinc oxide |
| CN102974182B (en) * | 2012-11-21 | 2015-05-20 | 长沙有色冶金设计研究院有限公司 | Method for treating smelting flue gas containing secondary zinc oxide |
| CN103349901B (en) * | 2013-06-14 | 2016-07-06 | 中国恩菲工程技术有限公司 | Flue gas processing method and equipment thereof |
| GB2539363A (en) | 2014-06-12 | 2016-12-21 | Nec Corp | Communication system |
| CN105717328A (en) * | 2015-06-16 | 2016-06-29 | 阜阳师范学院 | Physical quantity sensor |
| CN104959007B (en) * | 2015-06-19 | 2017-12-22 | 国惠环保新能源有限公司 | The multitube water surface is from shock wave gas cleaning plant and method |
| CN106268265A (en) * | 2016-11-04 | 2017-01-04 | 成都清源天成环保工程有限公司 | A kind of complete desulphurization system of arcola |
| CN106731632A (en) * | 2016-12-30 | 2017-05-31 | 云南雄冶科技有限公司 | The device and its technique of a kind of zinc oxide removing sulfur dioxide in flue gas |
| CN107349775B (en) * | 2017-08-22 | 2023-04-07 | 吉林工业职业技术学院 | Wet type unit and method for desulfurizing and purifying carbon roasting flue gas |
| CN107837698B (en) * | 2017-11-16 | 2024-01-16 | 中国恩菲工程技术有限公司 | Dry powder slurrying and charging system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1449861A (en) * | 2003-02-11 | 2003-10-22 | 昆明有色冶金设计研究院 | Method and device for removing sulphur dioxide in flue gas by zinc oxide |
| CN202289862U (en) * | 2011-10-21 | 2012-07-04 | 中国恩菲工程技术有限公司 | Zinc oxide desulfurization system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1449861A (en) * | 2003-02-11 | 2003-10-22 | 昆明有色冶金设计研究院 | Method and device for removing sulphur dioxide in flue gas by zinc oxide |
| CN202289862U (en) * | 2011-10-21 | 2012-07-04 | 中国恩菲工程技术有限公司 | Zinc oxide desulfurization system |
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