CN101254393A - Secondary zinc oxide slurry treating light concentration SO2 flue gas method and device thereof - Google Patents

Secondary zinc oxide slurry treating light concentration SO2 flue gas method and device thereof Download PDF

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CN101254393A
CN101254393A CNA2008100494608A CN200810049460A CN101254393A CN 101254393 A CN101254393 A CN 101254393A CN A2008100494608 A CNA2008100494608 A CN A2008100494608A CN 200810049460 A CN200810049460 A CN 200810049460A CN 101254393 A CN101254393 A CN 101254393A
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slurry
zinc
zinc oxide
collecting tank
pump
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CNA2008100494608A
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CN101254393B (en
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赵传和
卢迪
王健
翟延忠
汤伟
徐诗艳
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河南豫光金铅股份有限公司
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Abstract

The invention relates to a method which adopts secondary zinc oxide slurry to treat SO2 off-gas having low concentration, as well as the device thereof, and has the following steps: water or filtrate is used for preparing slurry together with secondary zinc oxide; the slurry is delivered to the liquid collecting trough of a torrential scrubber; the slurry in the liquid collecting trough is pumped into the reverse spraying tower nozzle of the torrential scrubber through a circulation pump, the slurry is delivered to an oxidation tower through an agitator pump, sulfuric acid is added from the top part of the oxidation tower, compressed air is input from the bottom end, the oxidated slurry is discharged into an acid hydrolysis trough, and the acid hydrolysis slurry is pumped into a box filter press through a pressing filter pump for realizing solid-liquid separation; the secondary zinc oxide slurry is adopted to absorb the SO2 in the smelter off-gas, so as to enable the processed off-gas to reach standard discharge, and reduce the pollution to the environment caused by the SO2 off-gas of a lead-zinc smeltery, thereby having the advantages of high operating rate, good working condition, low equipment failure rate, high desulfurization efficiency, etc., and enabling the sulfur, zinc and lead resources to be comprehensively utilized.

Description

Secondary zinc oxide slurry treating light concentration SO 2The method of flue gas and device thereof
Technical field
The invention belongs to the non-ferrous metal metallurgy industry, relate in particular to a kind of employing secondary zinc oxide slurry and administer low concentration SO 2The secondary zinc oxide slurry treating light concentration SO of flue gas 2The method of flue gas and device thereof.
Background technology
The method of flue gas desulfurization is varied, has reached hundreds ofly, but can be divided into wet method, semidry method and dry method three major types by technological process.Wet method is most widely used in the world, and technology is the most ripe.China's exhuast gas desulfurization technology was just studied in sulfuric acid industry and colored metallurgical industrial as far back as the fifties, to the low concentration SO of burning generation 2The processing research of flue gas just begins the seventies.But up to the present, the flue gas desulfurization technique that China is comparatively ripe mainly is two subtractions, lime method etc., and what these two kinds of methods were used in coloured industry is more.
The shortcoming one of two alkaline process generates calcium sulfite when being the sodium sulfite regeneration that absorb to generate, though most of oxidable be calcium sulfate, always have a certain amount of calcium sulfite not oxidized, influence the utilization again of gypsum; The 2nd, the part sodium salt can be lost in the filter cake, causes to partially absorb liquid consumption, increases operating cost; The 3rd, the regeneration absorption liquid contains calcium ion, must soften, otherwise easily cause fouling, causes equipment, line clogging.
Lime method adopts the SO in the lime slurry absorption flue gas 2, at first generating calcium sulfite, oxidation generates gypsum then, can abandon or reclaim gypsum.Lime method shortcoming one is the CaSO that the milk of lime direct desulfurization generates 31/2H 2O and CaCO 42H 2O solubility is extremely low, easily reaches the supersaturation crystallization and separates out, and produces fouling, causes equipment, line clogging when serious and can't move; The 2nd, the calcium sulfate that desulfurization generates contains a small amount of calcium sulfite, and influence is recycled, and causes second environmental pollution easily when storing up.
Adopt zinc oxide to remove sulfur in smoke in the exploitation filling pipe end mountain of Wetting sulfur method mineral bureau the eighties and carried out half industrial test, but owing on pipeline, equipment stop up, do not have good solution, make the zinc oxide method application of not succeeding.
At above-mentioned deficiency, nonferrous metallurgy studying and designing institute, Kunming once proposed a kind of technical solution, this scheme is that application number is 03104017.9, denomination of invention is " zinc oxide removes SO 2 from fume method and device ", this method is selected the capital equipment of tubulent contact tower as desulfurization for use, secondary zinc oxide with contain sulfur dioxide flue gas desulphurization reaction take place in tubulent contact tower, reach the purpose that purifies flue gas.There is following shortcoming in this method: (1) is owing to add oxygen-inhibiting agent in the circulation slurry, stoped zinc sulfite to be oxidized to the reaction of zinc sulfate, make the solids content in the circulation slurry be tending towards increasing, solids content very easily causes some position deposition, the obstruction of solid at equipment and pipeline up to 18-22%; (2) because the solubility of zinc sulfite is very little, so easily form fouling at some position (as screen hole place) of tubulent contact tower; (3) when adopting air oxidation process or acid hydrolyzation to handle filter-press residues, filter-press residues needs process pulp earlier, just can advance oxidation trough or acidolysis groove, has increased equipment investment; (4) when handling filter-press residues with air oxidation process, oxygen-inhibiting agent residual in the filter-press residues is unfavorable for air oxidation.
Summary of the invention
The objective of the invention is to address the above problem, the zinc oxide that obtains is as desulfurizing agent and secondary zinc oxide that utilizes plumbous smelting process fuming Zn extraction to gather dust to obtain or zinc metallurgical process rotary kiln gather dust, select for use rapids to remove the capital equipment of sulfur dioxide towards the washer conduct, it is that the slurry of 10-18% absorbs at rapids sulfur dioxide flue gas to low concentration in the washer that secondary zinc oxide is mixed with concentration, generate zinc sulfite, lead sulfite, the flue gas after the desulfurization is introduced the secondary zinc oxide slurry treating light concentration SO of smoke stack emission by blower fan 2The method of flue gas and device thereof.Desulfurization product zinc sulfite, lead sulfite etc. are handled through peroxidating, acidolysis, as the raw material and the plumbous raw material of smelting of zinc electrolysis; Adopt all operations continuously of pump of carrying slurry simultaneously, the method that the pump that interruption is used is established return duct in the suitable position of outlet is kept in motion the slurry in pipeline, the pump always, has solved the deposition of solid in the slurry, blocking pipe and equipment effectively.Described method is that a kind of technology is simple, and equipment is reliable, invests lessly, and desulfurized effect is good, the secondary zinc oxide slurry treating light concentration SO of non-secondary pollution 2The method of flue gas and device thereof.
For realizing above purpose, the technical solution used in the present invention is as follows:
A kind of secondary zinc oxide slurry treating light concentration SO 2The method of flue gas may further comprise the steps:
The first step: water or join churned mechanically that the preparation solid content is the slurry of 10-18% in the stock tank from the filtrate of filter press and secondary zinc oxide;
Second step: with pump the slurry for preparing be transported to rapid towards washer collecting tank in;
The 3rd step: the slurry in the collecting tank is got to rapids in the shower nozzle of the contrary spray tower of washer with circulating pump, slip is bottom-up ejection from shower nozzle, collide with from top to bottom gas in the described contrary spray tower, SO2 in the gas is absorbed by slurry, generate zinc sulfite, lead sulfite and a spot of zinc sulfate, zinc sulfite, lead sulfite still are suspended in the slurry, and zinc sulfate is dissolved in the water of slurry; Gas and slurry enter collecting tank from the bottom of contrary spray tower, realize gas-liquid separation in collecting tank; Gas is discharged from top vent upwards by behind the demister that is installed on collecting tank top, enters chimney by air-introduced machine again, and slurry falls into sump bottom and recycles;
The 4th step: when the pH value of the slurry in the described collecting tank reaches 4.8-5.2, from the arm that stirs delivery side of pump the part slurry is transported to the oxidizing tower, mend slurry from the inlet of circulating pump pipe then, keep the liquid level in the collecting tank that big fluctuation does not take place into new preparation;
The 5th step: add a spot of sulfuric acid from the top of oxidizing tower, the pH value of slurry is wherein adjusted to 4.0-4.5, to slurry, feed compressed air by plastic microporous pipe from the oxidizing tower bottom simultaneously, most of zinc sulfite and lead sulfite in the slurry are oxidized to zinc sulfate and lead sulfate, zinc sulfate is dissolved in the water in the slurry, lead sulfate still is suspended in the slurry, and the gas of generation is discharged from the oxidizing tower top, merges in the low concentration SO2 fume of desire improvement;
The 6th step: the slurry after the oxidation enters in the acidolysis groove, slowly adds sulfuric acid from acidolysis groove top, and stirs with mechanical agitation, and zinc oxide, lead oxide and zinc sulfite, lead sulfite and sulfuric acid reaction remaining in the slurry generate zinc sulfate, aluminum sulfate; Zinc sulfate is water-soluble, and lead sulfate still is suspended in the slurry; The gas that reaction generates is discharged from acidolysis groove top, merges to the low concentration SO that desire is administered 2In the flue gas; Slurry pH value in the acidolysis groove is controlled to be 2.0-2.5;
The 7th goes on foot: with the press filtration pump the intact slurry of acidolysis is got to and realized Separation of Solid and Liquid in the chamber-type press filter; The solid of separating is mainly lead sulfate, and the raw material plumbous as refining returns plumbous smelting system, and the liquid of separating is solution of zinc sulfate.
Joining the used secondary zinc oxide of slurry is that the ZnO that contains of plumbous smeltery fuming Zn extraction output is 50--80%, and PbO is the secondary zinc oxide of 8--15%.
Joining the used secondary zinc oxide of slurry is that the ZnO that contains of the rotary kiln output of zinc smeltery is 50--80%, and PbO is the secondary zinc oxide of 8--15%.
In step 7, the liquid that filter press is separated is solution of zinc sulfate, when zinc ion concentration reaches 100g/L when above, send the raw material of zinc factory as electrolytic zinc, perhaps send the zinc salt workshop as the raw material of producing zinc sulfate, perhaps send the nano zine oxide workshop as producing the raw material of nano zine oxide, when ion concentration does not reach 100g/L, return and join stock tank and join slurry again.
Feed compressed air in the oxidizing tower bottom by plastic microporous pipe, compressed-air actuated pressure is 0.3-0.4Mp, and compressed-air actuated feeding amount also will satisfy slurry in the oxidizing tower is stirred except that the oxidation needs that satisfy slurry, prevents the needs of slurry deposition.
A kind of secondary zinc oxide slurry treating light concentration SO 2The device of flue gas comprises the stock tank of joining of preparing secondary zinc oxide slurry,
Select for use rapids to administer low concentration SO as secondary zinc oxide towards washer 2The equipment of flue gas, rapids towards the collecting tank of washer by pump and pipeline with join the stock tank connection, rapids is connected towards the contrary spray tower of washer by circulating pump and rapids towards the collecting tank of washer, contrary spray tower and top-down sulfur dioxide flue gas pipeline are connected, rapids is a demister towards the collecting tank top of washer, rapids is connected by blower fan and chimney towards the washer top vent
Rapids is provided with and the rapid stirring pump that connects towards the collecting tank of washer towards the liquid collecting trough rim of washer, stir pump and connect the collecting tank of rapids from the circulating pump opposite towards washer, sump bottom from rapids towards washer is connected the collecting tank of rapids towards washer again, stir the slurry of pump from circulating pump opposite extraction collecting tank, be driven at a high speed the collecting tank slurry from sump bottom again, make the slurry in the collecting tank be in the turbulence state, prevent that the solid in the slurry from depositing in collecting tank
Stir between delivery side of pump pipe and the oxidizing tower and establish an arm, by this arm the slurry that pH value in the collecting tank reaches 4.8-5.2 is transported in the oxidizing tower, the top exit of oxidizing tower is connected the sulfur dioxide flue gas pipeline, oxidizing tower is provided with sulfuric acid and adds inlet, oxidizing tower is connected with extraneous by air compressor machine, the discharge gate of oxidizing tower is connected the acidolysis groove, on the acidolysis groove, have sulfuric acid inlet and reaction gas outlet, reaction gas outlet and low concentration sulphur dioxide flue gas pipeline are connected, and the acidolysis groove is connected by press filtration pump and chamber-type press filter.
Inlet of circulating pump Guan Shangshe adds the arm of the secondary zinc oxide slurry of new preparation.The liquid that chamber-type press filter is separated is connected zinc factory, and the solid of separating is connected plumbous factory.All operations continuously of pump that all carry slurry are interrupted the pump that uses and establish return duct in the suitable position of outlet, the slurry in pipeline, the pump are kept in motion, to prevent the deposition of solid in the slurry, blocking pipe and equipment.
The present invention is for two alkaline process and lime method, do not need the outsourcing desulfurizing agent, the processing of desulfurization product (zinc sulfate, lead sulfate etc.) combines with production technology plumbous, the zinc smeltery, to comprehensive reutilizations such as zinc sulfate, lead sulfates, characteristics have been embodied because of condition suiting measures to different conditions, once proposed " zinc oxide removes SO 2 from fume method and device " with respect to Kunming nonferrous metallurgy studying and designing institute following advantage was arranged: adopt plumbous the gather dust secondary zinc oxide that obtains and the zinc of fuming Zn extraction of smelting to smelt the rotary kiln secondary zinc oxide that obtains that gathers dust and directly join slurry, do not need pulverising apparatus; Characteristics such as the absorption tower selects for use rapids towards washer, and it adopts the dynamic wave technology, has the absorption efficiency height, and shower nozzle does not stop up, and SR is little; Absorb slag direct oxidation, acidolysis processing, make technological process short, the system configuration compactness, small investment, technical conditions are controlled easily, and are easy to operate; Adopt effective anti-blockage method, successfully solved pipeline, device blockage, make system job rate height, labour intensity is low, can be widely used in smelting, the improvement of the low concentration sulphur dioxide flue gas of industry such as sulfuric acid, smelting power plant for self-supply.
Description of drawings
Fig. 1 is a process chart of the present invention.
The specific embodiment
A kind of secondary zinc oxide slurry treating light concentration SO 2The method of flue gas may further comprise the steps:
The first step: water or join churned mechanically that the preparation solid content is the slurry of 10-18% in the stock tank 2 from the filtrate of filter press and secondary zinc oxide;
Second step: the slurry for preparing is transported to rapid in 1 collecting tank 1-1 of washer with pump;
The 3rd step: the slurry among the collecting tank 1-1 is got to rapids in the shower nozzle of the contrary spray tower 1-2 of washer 1 with circulating pump 5, slip is bottom-up ejection from shower nozzle, collide with from top to bottom gas in the described contrary spray tower, SO2 in the gas is absorbed by slurry, generate zinc sulfite, lead sulfite and a spot of zinc sulfate, zinc sulfite, lead sulfite still are suspended in the slurry, and zinc sulfate is dissolved in the water of slurry; Gas and slurry enter collecting tank 1-1 from the bottom of contrary spray tower 1-2, realize gas-liquid separation in collecting tank; Gas is discharged from top vent upwards by behind the demister that is installed on collecting tank top, enters chimney by air-introduced machine 10 again, and slurry falls into sump bottom and recycles;
The 4th step: when the pH value of the slurry in the described collecting tank reaches 4.8-5.2, from the arm of the outlet of stirring pump 4 the part slurry is transported to the oxidizing tower 6, mend slurry from the inlet tube of circulating pump 5 then, keep the liquid level in the collecting tank that big fluctuation does not take place into new preparation;
The 5th step: add a spot of sulfuric acid from the top of oxidizing tower 6, the pH value of slurry is wherein adjusted to 4.0-4.5, to slurry, feed compressed air by plastic microporous pipe from the oxidizing tower bottom simultaneously, most of zinc sulfite and lead sulfite in the slurry are oxidized to zinc sulfate and lead sulfate, zinc sulfate is dissolved in the water in the slurry, lead sulfate still is suspended in the slurry, and the gas of generation is discharged from oxidizing tower 6 tops, merges in the low concentration SO2 fume of desire improvement;
The 6th step: the slurry after the oxidation enters in the acidolysis groove 7, slowly adds sulfuric acid from acidolysis groove 7 tops, and stirs with mechanical agitation, and zinc oxide, lead oxide and zinc sulfite, lead sulfite and sulfuric acid reaction remaining in the slurry generate zinc sulfate, lead sulfate; Zinc sulfate is water-soluble, and lead sulfate still is suspended in the slurry; The gas that reaction generates is discharged from acidolysis groove top, merges to the low concentration SO that desire is administered 2In the flue gas; Slurry pH value in the acidolysis groove is controlled to be 2.0-2.5;
The 7th goes on foot: with press filtration pump 8 the intact slurry of acidolysis is got in the chamber-type press filter 9 and realized Separation of Solid and Liquid; The solid of separating is mainly lead sulfate, and the raw material plumbous as refining returns plumbous smelting system, and the liquid of separating is solution of zinc sulfate.
Joining the used secondary zinc oxide of slurry is that the ZnO that contains of plumbous smeltery fuming Zn extraction output is 50--80%, and PbO is the secondary zinc oxide of 8--15%.
Joining the used secondary zinc oxide of slurry is that the ZnO that contains of the rotary kiln output of zinc smeltery is 50-80%, and PbO is the secondary zinc oxide of 8--15%.
In step 7, the liquid that filter press 9 is separated is solution of zinc sulfate, when zinc ion concentration reaches 100g/L when above, send the raw material of zinc factory as electrolytic zinc, perhaps send the zinc salt workshop as the raw material of producing zinc sulfate, perhaps send the nano zine oxide workshop as producing the raw material of nano zine oxide, when ion concentration does not reach 100g/L, return and join stock tank 2 and join slurry again.
Feed compressed air in the oxidizing tower bottom by plastic microporous pipe, compressed-air actuated pressure is 0.3-0.4Mp, and compressed-air actuated feeding amount also will satisfy slurry in the oxidizing tower is stirred except that the oxidation needs that satisfy slurry, prevents the needs of slurry deposition.
A kind of secondary zinc oxide slurry treating light concentration SO 2The device of flue gas, what comprise the preparation secondary zinc oxide slurry joins stock tank 2,
A, select for use rapids to administer low concentration SO as secondary zinc oxide towards washer 1 2The equipment of flue gas, rapids towards the collecting tank 1-1 of washer 1 by pump 3 and pipeline with join stock tank 2 connections, rapids is connected with the contrary spray tower 1-2 of rapids towards washer 1 by circulating pump 5 towards the collecting tank 1-1 of washer 1, contrary spray tower 1-2 and top-down sulfur dioxide flue gas pipeline are connected, rapids is a demister towards the collecting tank 1-1 top of washer 1, rapids is connected by blower fan 10 and chimney towards washer 1 top vent
B, be provided with the mixing pump 4 that the collecting tank with turbulent impulse scrubber 1 connects at the liquid collecting trough rim of turbulent impulse scrubber 1; Mixing pump 4 is connected the collecting tank of turbulent impulse scrubber 1 from circulating pump 5 opposites; Connect again the collecting tank of turbulent impulse scrubber 1 from the sump bottom of turbulent impulse scrubber 1; Mixing pump 4 extracts the slurry the collecting tank from circulating pump 5 opposites; Be driven at a high speed the collecting tank slurry from sump bottom again; Make the slurry in the collecting tank be in the turbulence state; Prevent that the solid in the slurry from depositing in collecting tank 1-1
Establish an arm between c, the outlet that stirs pump 4 and the oxidizing tower 6, by this arm the slurry that pH value in the collecting tank reaches 4.8-5.2 is transported in the oxidizing tower 6, the top exit of oxidizing tower is connected the sulfur dioxide flue gas pipeline, oxidizing tower is provided with sulfuric acid and adds inlet, oxidizing tower is connected with extraneous by air compressor machine 11, the discharge gate of oxidizing tower is connected acidolysis groove 7, on acidolysis groove 7, have sulfuric acid inlet and reaction gas outlet, reaction gas outlet and low concentration sulphur dioxide flue gas pipeline are connected, and acidolysis groove 7 is connected by press filtration pump 8 and chamber-type press filter 9.
Establish the arm of the secondary zinc oxide slurry of adding new preparation on the inlet tube of circulating pump 5.
The liquid that chamber-type press filter 9 is separated is connected zinc factory, and the solid of separating is connected plumbous factory.
All operations continuously of pump that all carry slurry are interrupted the pump that uses and establish return duct in the suitable position of outlet, the slurry in pipeline, the pump are kept in motion, to prevent the deposition of solid in the slurry, blocking pipe and equipment.
With secondary zinc oxide and industry water or to be mixed with solid content from the filtrate of filter press in joining stock tank 2 be the 10-18% secondary zinc oxide slurry, with being pumped into rapids in the collecting tank 1-1 of washer 1, send into the rapid contrary bottom-up injection of shower nozzle of spraying among the tower 1-2 in washer 1 through circulating pump 5, in contrary spray tower 1-2 mass transport process taking place with top-down sulfur dioxide flue gas carries out desulfurization, flue gas after the desulfurization and slurry fall into collecting tank 1-1 by contrary spray tower 1-2 bottom, in collecting tank 1-1, carry out gas, liquid two is separated, gas after the separation is by after the demister foam removal on collecting tank 1 top, towards washer 1 top vent, send into smoke stack emission through rapids by blower fan 10.Liquid falls into collecting tank 1-1 after the gas-liquid separation, with the SO of the new secondary zinc oxide slurry that replenishes in circulating pump 5 circulation absorption flue gases 2When the PH of the slurry among the collecting tank 1-1 reaches 4.5-5.2 and proportion and reaches 1.7, enter in the oxidizing tower 6 by an arm that stirs pump 4 outlets, the air that blasts by air compressor machine 11 in oxidizing tower 6 carries out oxidation to the slurry in the oxidizing tower, the pH value that adds slurry in the sulfuric acid adjustment oxidizing tower during oxidation is 4.0-4.5, mainly be that zinc sulfite is oxidized to zinc sulfate, the air that while air compressor machine 11 blasts effectively stirs the slurry in the oxidizing tower, prevents the deposition of solid in the slurry; Oxidizing process produces contains SO 2Gas turns back to the low concentration SO that desire is administered by the top exit of oxidizing tower 2In the flue gas.Slurry after the oxidation is drained into acidolysis groove 7 by the discharge gate of oxidizing tower 6, adds an amount of sulfuric acid at acidolysis groove 7 tops, makes zinc oxide remaining in the slurry, lead oxide and zinc sulfite, lead sulfite and sulfuric acid reaction generate zinc sulfate, lead sulfate; Zinc sulfate is water-soluble, and lead sulfate still is suspended in the slurry, and the slurry pH value in the acidolysis groove is controlled to be 2.0-2.5; The gas that reaction generates is discharged from acidolysis groove top, merges to the low concentration SO that desire is administered 2In the flue gas; Material after the acidolysis is squeezed into through press filtration pump 8 and is carried out Separation of Solid and Liquid in the chamber-type press filter 9, the liquid of separating is mainly solution of zinc sulfate, when solution of zinc sulfate concentration reaches 100g/L, send zinc factory to reclaim zinc or preparation zinc sulfate crystal, also can be used to prepare nano zine oxide.The solid of separating is mainly lead sulfate, the raw material that send plumbous factory to smelt as lead.
Step is: join slurry----absorbs and----absorbs the slurries oxidation and----absorb slurries acidolysis----and absorb the slurries separation.Join that ZnO is 50--80% in the used secondary zinc oxide of slurry, PbO is 8--10%.In joining stock tank, be mixed with the slurry that solid content is 10-18%, the slurry for preparing squeezed into rapids in washer, at rapids slurry and SO in the washer with pump 2Absorption reaction takes place, when the pH value of loop slurry reaches 4.8-5.2, proportion reaches at 1.7 o'clock, an arm that absorbs the stirring pump discharge of slurries from rapids towards washer enters and carries out oxidation the oxygen column, the PH that adjusts the oxidation slurries is 4.0-4.5, and the pressure that is blasted the air of oxidizing tower by air compressor machine is controlled to be 0.3-0.4Mp, and the air capacity that air compressor machine blasts is except that the oxidation needs that satisfy slurry, also to satisfy slurry in the oxidizing tower is stirred, prevent the needs of slurry deposition; The intact slurries of oxidation are handled through sulfuric acid solution again, make secondary zinc oxide, lead oxide and the zinc sulfite, lead sulfite and the sulfuric acid reaction that have neither part nor lot in reaction, generate zinc sulfate, lead sulfate fully, and acidolysis terminal point PH is controlled to be 2.0-2.5; The intact slurries of acidolysis are squeezed into chamber-type press filter through the press filtration pump and are carried out Separation of Solid and Liquid, obtain solution of zinc sulfate, sulfuric acid lead skim after the separation.When the zinc particles concentration of solution of zinc sulfate reaches 100g/L when above, send zinc factory as electrolytic zinc raw material or send the zinc salt workshop as producing the raw material of zinc sulfate, can also be as the raw material of producing nano zine oxide, when solution of zinc sulfate zinc particles concentration does not reach 100g/L, then return and join stock tank and participate in joining slurry, reach more than the 100g/L until zinc particles concentration; Lead sulfate returns plumbous smelting system, as plumbous raw materials for metallurgy.

Claims (9)

1, a kind of secondary zinc oxide slurry treating light concentration SO 2The method of flue gas is characterized in that: may further comprise the steps:
The first step: water or join churned mechanically that the preparation solid content is the slurry of 10-18% in the stock tank (2) from the filtrate of filter press and secondary zinc oxide;
Second step: the slurry for preparing is transported to rapids in the collecting tank (1-1) of (1) of washer with pump;
The 3rd step: the slurry in the collecting tank (1-1) is got to rapids in the shower nozzle of the contrary spray tower (1-2) of washer (1) with circulating pump (5), slip is bottom-up ejection from shower nozzle, collide with from top to bottom gas in the described contrary spray tower, SO2 in the gas is absorbed by slurry, generate zinc sulfite, lead sulfite and a spot of zinc sulfate, zinc sulfite, lead sulfite still are suspended in the slurry, and zinc sulfate is dissolved in the water of slurry; Gas and slurry enter collecting tank (1-1) from the bottom of contrary spray tower (1-2), realize gas-liquid separation in collecting tank; Gas is discharged from top vent upwards by behind the demister that is installed on collecting tank top, enters chimney by air-introduced machine (10) again, and slurry falls into sump bottom and recycles;
The 4th step: when the pH value of the slurry in the described collecting tank reaches 4.8-5.2, from the arm of the outlet of stirring pump (4) the part slurry is transported to the oxidizing tower (6), mend slurry from the inlet tube of circulating pump (5) then, keep the liquid level in the collecting tank that big fluctuation does not take place into new preparation;
The 5th step: add a spot of sulfuric acid from the top of oxidizing tower (6), the pH value of slurry is wherein adjusted to 4.0-4.5, to slurry, feed compressed air by plastic microporous pipe from the oxidizing tower bottom simultaneously, most of zinc sulfite and lead sulfite in the slurry are oxidized to zinc sulfate and lead sulfate, zinc sulfate is dissolved in the water in the slurry, lead sulfate still is suspended in the slurry, and the gas of generation is discharged from oxidizing tower (6) top, merges in the low concentration SO2 fume of desire improvement;
The 6th step: the slurry after the oxidation enters in the acidolysis groove (7), slowly add sulfuric acid from acidolysis groove (7) top, and stir with mechanical agitation, zinc oxide, lead oxide and zinc sulfite, lead sulfite and sulfuric acid reaction remaining in the slurry generate zinc sulfate, lead sulfate; Zinc sulfate is water-soluble, and lead sulfate still is suspended in the slurry; The gas that reaction generates is discharged from acidolysis groove top, merges to the low concentration SO that desire is administered 2In the flue gas; Slurry pH value in the acidolysis groove is controlled to be 2.0-2.5;
The 7th step: the intact slurry of acidolysis is got to realization Separation of Solid and Liquid in the chamber-type press filter (9) with press filtration pump (8); The solid of separating is mainly lead sulfate, and the raw material plumbous as refining returns plumbous smelting system, and the liquid of separating is solution of zinc sulfate.
2, secondary zinc oxide slurry treating light concentration SO according to claim 1 2The method of flue gas is characterized in that: joining the used secondary zinc oxide of slurry is that the ZnO that contains of plumbous smeltery fuming Zn extraction output is 50--80%, and PbO is the secondary zinc oxide of 8--15%.
3, secondary zinc oxide slurry treating light concentration SO according to claim 1 2The method of flue gas is characterized in that: joining the used secondary zinc oxide of slurry is that the ZnO that contains of the rotary kiln output of zinc smeltery is 50--80%, and PbO is the secondary zinc oxide of 8--15%.
4, secondary zinc oxide slurry treating light concentration SO according to claim 1 2The method of flue gas, it is characterized in that: in step 7, the liquid that filter press (9) is separated is solution of zinc sulfate, when zinc ion concentration reaches 100g/L when above, send the raw material of zinc factory, perhaps send the zinc salt workshop, perhaps send the nano zine oxide workshop as the raw material of producing nano zine oxide as the raw material of producing zinc sulfate as electrolytic zinc, when ion concentration does not reach 100g/L, return and join stock tank (2) and join slurry again.
5, secondary zinc oxide slurry treating light concentration SO according to claim 1 2The method of flue gas, it is characterized in that: feed compressed air in the oxidizing tower bottom by plastic microporous pipe, compressed-air actuated pressure is 0.3-0.4Mp, and compressed-air actuated feeding amount is except that the oxidation needs that satisfy slurry, also to satisfy slurry in the oxidizing tower is stirred, prevent the needs of slurry deposition.
6, a kind of secondary zinc oxide slurry treating light concentration SO 2The device of flue gas, what comprise the preparation secondary zinc oxide slurry joins stock tank (2), it is characterized in that:
A, select for use rapids to administer low concentration SO as secondary zinc oxide towards washer (1) 2The equipment of flue gas, rapids towards the collecting tank (1-1) of washer (1) by pump (3) and pipeline and join stock tank (2) connection, rapids is connected towards the contrary spray tower (1-2) of washer (1) by circulating pump (5) and rapids towards the collecting tank (1-1) of washer (1), contrary spray tower (1-2) is connected with top-down sulfur dioxide flue gas pipeline, rapids is a demister towards collecting tank (1-1) top of washer (1), rapids is connected by blower fan (10) and chimney towards washer (1) top vent
B, be provided with the mixing pump (4) that the collecting tank with turbulent impulse scrubber (1) connects at the liquid collecting trough rim of turbulent impulse scrubber (1); Mixing pump (4) is connected the collecting tank of turbulent impulse scrubber (1) from circulating pump (5) opposite; Connect again the collecting tank of turbulent impulse scrubber (1) from the sump bottom of turbulent impulse scrubber (1); Mixing pump (4) extracts the slurry the collecting tank from circulating pump (5) opposite; Be driven at a high speed the collecting tank slurry from sump bottom again; Make the slurry in the collecting tank be in the turbulence state; Prevent that the solid in the slurry from depositing in collecting tank (1-1)
C, establish an arm between the outlet of stirring pump (4) and the oxidizing tower (6), by this arm the slurry that pH value in the collecting tank reaches 4.8-5.2 is transported in the oxidizing tower (6), the top exit of oxidizing tower is connected the sulfur dioxide flue gas pipeline, oxidizing tower is provided with sulfuric acid and adds inlet, oxidizing tower is connected with extraneous by air compressor machine (11), the discharge gate of oxidizing tower is connected acidolysis groove (7), on acidolysis groove (7), have sulfuric acid inlet and reaction gas outlet, reaction gas outlet and low concentration sulphur dioxide flue gas pipeline are connected, and acidolysis groove (7) is connected by press filtration pump (8) and chamber-type press filter (9).
7, secondary zinc oxide slurry treating light concentration SO according to claim 6 2The device of flue gas is characterized in that: the arm of establishing the secondary zinc oxide slurry of adding new preparation on the inlet tube of circulating pump (5).
8, secondary zinc oxide slurry treating light concentration SO according to claim 6 2The device of flue gas is characterized in that: the liquid that chamber-type press filter (9) is separated is connected zinc factory, and the solid of separating is connected plumbous factory.
9, secondary zinc oxide slurry treating light concentration SO according to claim 6 2The device of flue gas is characterized in that: all operations continuously of pump that all carry slurry, and be interrupted the pump that uses and establish return duct in the suitable position of outlet, the slurry in pipeline, the pump is kept in motion, to prevent the deposition of solid in the slurry, blocking pipe and equipment.
CN2008100494608A 2008-04-02 2008-04-02 Method and device for secondary zinc oxide slurry treating light concentration SO2 flue gas CN101254393B (en)

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