CN110559818A - Flue gas desulfurization method using secondary zinc oxide soot as desulfurizer - Google Patents
Flue gas desulfurization method using secondary zinc oxide soot as desulfurizer Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
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- B01D53/34—Chemical or biological purification of waste gases
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Abstract
the invention discloses a flue gas desulfurization method using secondary zinc oxide soot as a desulfurizing agent, which comprises a pulping process, an oxygen-enriched foam preparation process, a foam desulfurization process, a slurry filtration process after desulfurization, a purification and impurity removal process and a concentration and crystallization process2the absorption direction is carried out, the lengthy flow of subsequent oxidative desulfurization byproducts is removed, the foam absorption mode is utilized to reduce equipment blockage and scaling, the high-efficiency desulfurization production of zinc sulfate products by the smoke of the metallurgical furnace is realized, the environment-friendly treatment investment is changed into the environment-friendly benefit output, multiple purposes are achieved, and the national atmosphere pollution is preventedThe jig has positive promoting effect and obvious economic and environmental benefits.
Description
Technical Field
The invention relates to the technical field of treatment of industrial sulfur-containing tail gas, in particular to a flue gas desulfurization method using secondary zinc oxide soot as a desulfurizing agent.
background
in the prior art, flue gas desulfurization refers to the removal of sulfur oxides from flue gas or other industrial waste gas generated by an industrial furnace, which is abbreviated as FGD technology, and is essentially a process of absorbing acidic sulfur oxides in flue gas by using alkaline substances. The most commonly used types of alkaline substances are limes, sodium bases. The absorption methods include dry type, wet type, semi-wet type, etc., wherein the wet desulfurization method mainly adopts limestone-gypsum method, sodium-alkali method, double-alkali method, ammonia absorption method, etc., and the main reasons for adopting the methods are mature technology, low equipment requirement, simple process, wide desulfurizer (absorbent) obtaining way and convenient use. But also has a plurality of defects, such as large consumption of desulfurizer, high operation and maintenance cost, low comprehensive utilization rate of the produced sulfur-containing byproduct slag (such as gypsum, sulfenamide products and the like), easy secondary pollution and the like.
As early as the end of the 20 th century, researchers in China have studied the technology of applying zinc hypoxide soot to flue gas desulfurization and comprehensive utilization of desulfurization byproducts, but the industrial application of the zinc hypoxide soot and the comprehensive utilization of the desulfurization byproducts cannot be realized due to the technical problems of low absorption rate, poor equipment adaptability and the like in the flue gas desulfurization process. In recent years, some domestic large-scale lead-zinc smelting enterprises establish zinc oxide desulfurization industrial devices in succession, and key technical problems of low absorption rate, scaling, blockage and the like caused by the fact that zinc sulfite can not be converted into soluble zinc sulfate in time in the desulfurization process are not solved and are not successful. Domestic secondary zinc oxide soot is used as an absorbent for flue gas desulfurization, so that the industrial application is very few, and the successful application cases of the zinc oxide desulfurization technology are only two cases at present. The prior art is only applied to lead-zinc smelting enterprises, has high requirements on the grade and impurities of secondary zinc oxide, has long process in the aspect of zinc sulfite conversion, needs to oxidize and dissolve the zinc sulfite in subsequent treatment, and has certain limitation in the aspect of process technology and equipment.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a flue gas desulfurization method using secondary zinc oxide soot as a desulfurizing agent, wherein the secondary zinc oxide soot is used as the desulfurizing agent to carry out flue gas desulfurization and realize comprehensive utilization of desulfurization byproducts to produce industrial grade zinc sulfate heptahydrate.
In order to achieve the purpose, the invention adopts the technical scheme that: a flue gas desulfurization method using secondary zinc oxide soot as a desulfurizing agent comprises the following process steps:
S1, pulping, namely mixing the secondary zinc oxide ash with clear water or return liquid in subsequent processes to prepare pulp, wherein the liquid-solid ratio is controlled to be (5-10): 1, stirring for 10-30 min at normal temperature, and overflowing to obtain slurry with uniform particle size and strong activity;
S2, an oxygen-enriched conversion-foam desulfurization process comprises the following three steps:
S21, an oxygen-enriched foaming process, namely transferring the slurry obtained in the S1 process into a transfer tank, adding a foaming agent with the volume of 1-5% of that of the slurry, injecting the prepared foaming agent slurry into a liquid storage tank of a desulfurization device, and introducing oxygen-enriched air with the oxygen content of 25-40% in volume percentage into the bottom of the liquid storage tank through a foam generator, wherein the foam diameter is 10-25 mm;
s22, a foam desulfurization process, wherein 70-90 ℃ sulfur-containing flue gas is introduced into a bottom flue gas inlet of a desulfurization device in the S21 process, the desulfurization device is in two groups of serial connection and is communicated up and down, two-stage desulfurization of the flue gas is realized through the two groups of serial desulfurization devices, the flue gas is ensured to be discharged up to the standard, the treated qualified flue gas is emptied through a flue gas pipeline, slurry after the flue gas is absorbed enters a circulation regulating pool for recycling, and the slurry after the desulfurization in the circulation regulating pool is qualified through determination of a PH value and a zinc-sulfur ratio and then enters the next process;
s23, a step of filtering desulfurized slurry, which is to perform clarification and separation on the qualified slurry with the pH value of 3-5 and the zinc-sulfur ratio of 0.8-1.0 after the step of S22, to obtain bottom slurry, return the bottom slurry to a furnace for batching after filter pressing, and mix the filter liquor after filter pressing with the supernatant of a transfer tank to obtain zinc sulfate solution to enter the next step;
s3, a zinc sulfate refining process comprises the following two steps:
S31, a purification and impurity removal process, namely maintaining the temperature of the zinc sulfate solution obtained in the S23 at 60-70 ℃, adjusting the pH value of the solution to 4.0-5.0, adding a purifying agent with the impurity theoretical amount of 1.2 times, performing two-stage continuous countercurrent purification, performing filter pressing to obtain slag, returning the slag to a reduction furnace for batching, further recovering valuable metals, and allowing the filtrate to enter the next process;
s32, a concentration and crystallization process, namely evaporating and concentrating the filtrate obtained in the S31 process, performing crystallization separation, air drying, and packaging a series of conventional processes to obtain an industrial grade zinc sulfate heptahydrate product, wherein the purity of the zinc heptahydrate is more than or equal to 98%, and the zinc content is more than or equal to 21%.
Further, the foaming agent is one or a mixture of more of sulfate group and sulfonic group, and the purifying agent is one or a mixture of zinc powder and antimony white powder.
Furthermore, the desulfurization device is in a column-shaped structure with narrow upper part and narrow middle part, the lower narrow part is a liquid storage tank, the middle wide part is a foam layer, the upper narrow part is a partition plate layer, and sulfur-containing flue gas is introduced from the lower part of the desulfurization device and is fully absorbed by the foam layer of the middle wide part.
further, a stirring device is arranged in the transit tank, the slurry is pumped to each process through a slurry pump, and a venturi structure is arranged inside the foam generator.
Further, a plate and frame filter press is selected for the filter pressing operation as described above.
further, the normal temperature environment as mentioned above means that the temperature is 20-25 ℃.
Furthermore, the desulfurization device is two groups of series-connected devices, including a first-stage desulfurization tower and a second-stage desulfurization tower, wherein the flue gas enters the top of the first-stage desulfurization tower from the bottom and flows out and enters the bottom of the second-stage desulfurization tower again.
Compared with the prior art, the invention has the beneficial effects that: the invention adopts an oxygen-enriched conversion process to convert the insoluble zinc sulfite generated in the desulfurization process of the secondary zinc oxide soot into zinc sulfate in time and promote the reaction to be favorable for SO2the absorption direction is carried out, so that the tedious process of subsequent oxidation and desulfurization by-products is avoided; the foam desulfurization process is adopted, and the foam absorption mode reduces equipment blockage and scaling; and treating and refining the desulfurized zinc sulfate solution to obtain an industrial grade zinc sulfate heptahydrate product. Can solve the problem of comprehensive recovery of the secondary zinc oxide soot, and simultaneouslyThe method realizes the efficient desulfurization of the flue gas of the metallurgical furnace to produce the zinc sulfate product, achieves multiple purposes, has positive promotion effect on the prevention and control of regional atmosphere pollution by implementing the project, and has remarkable economic and environmental benefits. The secondary zinc oxide ash is used for producing zinc sulfate products by flue gas desulfurization, so that the purposes of treating waste by waste and comprehensively utilizing resources are realized. The method is worthy of popularization in the environmental protection industry and the metallurgy industry, and has obvious technical advancement and popularization significance.
drawings
FIG. 1 is a process scheme of the present invention.
Detailed Description
The following detailed description is provided in conjunction with the embodiments and with reference to the accompanying drawings in order to provide a further explanation of the technical features and advantages of the present invention.
As shown in figure 1, the flue gas desulfurization method using the secondary zinc oxide soot as a desulfurizing agent comprises the following process steps:
S1, pulping, namely mixing the secondary zinc oxide ash with clear water or return liquid in subsequent processes to prepare pulp, wherein the liquid-solid ratio is controlled to be (5-10): 1, stirring for 10-30 min at normal temperature, and overflowing to obtain slurry with uniform particle size and strong activity;
s2, an oxygen-enriched conversion-foam desulfurization process comprises the following three steps:
S21, an oxygen-enriched foaming process, namely transferring the slurry obtained in the S1 process into a transfer tank, adding a foaming agent with the volume of 1-5% of that of the slurry, injecting the prepared foaming agent slurry into a liquid storage tank of a desulfurization device, and introducing oxygen-enriched air with the oxygen content of 25-40% in volume percentage into the bottom of the liquid storage tank through a foam generator, wherein the foam diameter is 10-25 mm;
S22, a foam desulfurization process, wherein 70-90 ℃ sulfur-containing flue gas is introduced into a bottom flue gas inlet of a desulfurization device in the S21 process, the desulfurization device is in two groups of serial connection and is communicated up and down, two-stage desulfurization of the flue gas is realized through the two groups of serial desulfurization devices, the flue gas is ensured to be discharged up to the standard, the treated qualified flue gas is emptied through a flue gas pipeline, slurry after the flue gas is absorbed enters a circulation regulating pool for recycling, and the slurry after the desulfurization in the circulation regulating pool is qualified through determination of a PH value and a zinc-sulfur ratio and then enters the next process;
S23, a step of filtering desulfurized slurry, which is to perform clarification and separation on the qualified slurry with the pH value of 3-5 and the zinc-sulfur ratio of 0.8-1.0 after the step of S22, to obtain bottom slurry, return the bottom slurry to a furnace for batching after filter pressing, and mix the filter liquor after filter pressing with the supernatant of a transfer tank to obtain zinc sulfate solution to enter the next step;
S3, a zinc sulfate refining process comprises the following two steps:
s31, a purification and impurity removal process, namely maintaining the temperature of the zinc sulfate solution obtained in the S23 at 60-70 ℃, adjusting the pH value of the solution to 4.0-5.0, adding a purifying agent with the impurity theoretical amount of 1.2 times, performing two-stage continuous countercurrent purification, performing filter pressing to obtain slag, returning the slag to a reduction furnace for batching, further recovering valuable metals, and allowing the filtrate to enter the next process;
s32, a concentration and crystallization process, namely evaporating and concentrating the filtrate obtained in the S31 process, performing crystallization separation, air drying, and packaging a series of conventional processes to obtain an industrial grade zinc sulfate heptahydrate product, wherein the purity of the zinc heptahydrate is more than or equal to 98%, and the zinc content is more than or equal to 21%.
Further, the foaming agent is one or a mixture of more of sulfate group and sulfonic group, and the purifying agent is one or a mixture of zinc powder and antimony white powder. The desulfurizing device is a cylindrical tower-shaped structure with an upper narrow part and a lower narrow part and a middle wide part, the lower narrow part is a liquid storage tank, the middle wide part is a foam layer, the upper narrow part is a partition plate layer, sulfur-containing flue gas is introduced from the lower part of the desulfurizing device, and the foam layer at the middle wide part is fully absorbed. And a stirring device is arranged in the transit tank, the slurry is pumped to each process through a slurry pump, and a venturi structure is arranged in the foam generator. And a plate-and-frame filter press is selected for filter pressing operation. The normal temperature environment is that the temperature is 20-25 ℃. The desulfurization device is two sets of serial-type, including one section desulfurizing tower and second-stage desulfurizing tower, the flue gas gets into the bottom of top outflow and reentrant second-stage desulfurizing tower from one section desulfurizing tower bottom.
The first embodiment is as follows:
The flue gas desulfurization of the metallurgical furnace is treated by hazardous waste of certain environmental protection enterprises, and the amount of the flue gas to be treated is 60000m3H, flue gas SO2The concentration is 3500mg/m3the components of the zinc hypoxide soot are 26.8 percent of zinc, 2.56 percent of tin, 0.74 percent of lead, 1.25 percent of copper and 0 percent of nickel.98％。
The secondary zinc oxide soot is prepared by the following process steps:
1. pulping, mixing the secondary zinc oxide ash with clear water or return liquid of subsequent procedures to prepare pulp, and controlling the liquid-solid ratio to be 6: 1, stirring for 30min at normal temperature, and sending the overflowed slurry to an oxygen-enriched conversion-foam desulfurization process;
2. oxygen-enriched conversion-foam desulfurization, namely adding 1 percent of foaming agent into the overflow slurry of the former step in a transfer tank, stirring, injecting into a liquid storage tank at the bottom of the first and second foam desulfurization tower respectively, introducing oxygen-enriched air for bubbling, and controlling the volume of the first foam layer to be 10m3The volume of the two-stage foam layer is 20m3And opening a flue gas shutoff valve to introduce uniform flue gas to the bottom of the first section of foam desulfurization tower. The flue gas after the first-stage desulfurization enters a foam layer from the bottom of a second-stage desulfurization tower to carry out second-stage desulfurization, and the emission concentration of the qualified desulfurized flue gas is 197mg/m3. And (3) discharging the slurry at the bottom of the first-stage foam desulfurization tower after the pH value is measured to be less than 4.5, carrying out liquid-solid separation, conveying the solution containing 85g/l of zinc to a zinc sulfate refining process, and returning the slag to a pyrometallurgical furnace for batching. And (3) the slurry at the bottom of the second-section foam desulfurization tower passes through a circulating tank, is supplemented into a transfer tank, is mixed with fresh slurry of a foaming agent, is adjusted to have a zinc-sulfur ratio of 1.1, and returns to a liquid storage tank at the bottom of the first-section foam desulfurization tower for circulating desulfurization.
3. Refining zinc sulfate, namely adjusting the temperature of the zinc sulfate solution in the previous process to 60-70 ℃, respectively adding purifying agents such as zinc powder and antimony white powder according to the theoretical amount of 1.2 times to perform two-stage continuous countercurrent purification, wherein the concentration of zinc in the purification end point solution is 100g/l, the concentration of copper and nickel is less than 20mg/l, performing filter pressing to obtain slag, returning the slag to a reduction furnace for blending to further recover valuable metals such as tin and lead, performing conventional evaporation concentration → crystallization separation → air drying → packaging on the filtrate, wherein the evaporation concentration end point temperature is not more than 60 ℃, and the crystallization starting temperature is strictly controlled below 39 ℃, thus obtaining an industrial grade zinc sulfate heptahydrate product through the processes, wherein the purity of the zinc sulfate heptahydrate is not less than 98%, and the zinc.
example two:
The flue gas desulfurization of the metallurgical furnace is treated by hazardous waste of certain environmental protection enterprises, and the amount of the flue gas to be treated is 60000m3H, flue gas SO2The concentration is 3500mg/m3Sub-oxidation usedthe zinc ash comprises 61.36% of zinc, 0.09% of tin, 2.74% of lead, 0.25% of copper and 0.08% of nickel.
The secondary zinc oxide soot is prepared by the following process steps:
1. Pulping, mixing the secondary zinc oxide ash with clear water or return liquid of subsequent procedures to prepare pulp, and controlling the liquid-solid ratio to be 10: 1, stirring for 30min at normal temperature, and sending the overflowed slurry to an oxygen-enriched conversion-foam desulfurization process;
2. oxygen-enriched conversion-foam desulfurization, namely, 3 percent of foaming agent is added into the overflow slurry of the former step in a transfer tank, the mixture is stirred and then is respectively injected into a liquid storage tank at the bottom of the first section of foam desulfurization tower and the second section of foam desulfurization tower, oxygen-enriched air is introduced into the liquid storage tanks for bubbling, and the volume of the first section of foam layer is controlled to be 10m3The volume of the two-stage foam layer is 20m3And opening a flue gas shutoff valve to introduce uniform flue gas to the bottom of the first section of foam desulfurization tower. The flue gas after the first-stage desulfurization enters a foam layer from the bottom of a second-stage desulfurization tower to carry out second-stage desulfurization, and the emission concentration of the qualified desulfurized flue gas is 98mg/m3. And (3) discharging the slurry at the bottom of the first-stage foam desulfurization tower after the pH value is measured to be less than 4.5, carrying out liquid-solid separation, wherein the solution contains 121g/l of zinc, conveying the solution to a zinc sulfate refining process, and returning the slag to a pyrometallurgical furnace for batching. And (3) the slurry at the bottom of the second-section foam desulfurization tower passes through a circulating tank, is supplemented into a transfer tank, is mixed with fresh slurry of a foaming agent, is adjusted to have a zinc-sulfur ratio of 1.1, and returns to a liquid storage tank at the bottom of the first-section foam desulfurization tower for circulating desulfurization.
3. Refining zinc sulfate, namely adjusting the temperature of the zinc sulfate solution in the previous process to 60-70 ℃, respectively adding purifying agents such as zinc powder and antimony white powder according to the theoretical amount of 1.2 times to perform two-stage continuous countercurrent purification, wherein the concentration of zinc in the purification end point solution is 145g/l, and the concentration of copper and nickel in the purification end point solution is less than 20mg/l, performing filter pressing to obtain slag, returning the slag to a reduction furnace for blending to further recover valuable metals such as tin and lead, performing conventional evaporation concentration → crystallization separation → air drying → packaging on the filtrate, wherein the evaporation concentration end point temperature is not more than 60 ℃, and the crystallization starting temperature is strictly controlled below 39 ℃, thus obtaining an industrial grade zinc sulfate heptahydrate product through the processes, wherein the purity of the zinc sulfate heptahydrate is not.
Example three:
the flue gas desulfurization of the metallurgical furnace is treated by hazardous waste of certain environmental protection enterprises, and the amount of the flue gas to be treated is 60000m3h, flue gas SO2The concentration is 3500mg/m3the components of the zinc hypoxide soot are 39.12 percent of zinc, 0.08 percent of tin, 5.04 percent of lead, 3.25 percent of copper and 1.28 percent of nickel.
The secondary zinc oxide soot is prepared by the following process steps:
1. pulping, mixing the secondary zinc oxide ash with clear water or return liquid of subsequent procedures to prepare pulp, and controlling the liquid-solid ratio to be 8: 1, stirring for 30min at normal temperature, and sending the overflowed slurry to an oxygen-enriched conversion-foam desulfurization process;
2. Oxygen-enriched conversion-foam desulfurization, namely, 3 percent of foaming agent is added into the overflow slurry of the former step in a transfer tank, the mixture is stirred and then is respectively injected into a liquid storage tank at the bottom of the first section of foam desulfurization tower and the second section of foam desulfurization tower, oxygen-enriched air is introduced into the liquid storage tanks for bubbling, and the volume of the first section of foam layer is controlled to be 10m3The volume of the two-stage foam layer is 20m3And opening a flue gas shutoff valve to introduce uniform flue gas to the bottom of the first section of foam desulfurization tower. The flue gas after the first-stage desulfurization enters a foam layer from the bottom of a second-stage desulfurization tower to carry out second-stage desulfurization, and the emission concentration of the qualified desulfurized flue gas is 167mg/m3. And (3) discharging the slurry at the bottom of the first-stage foam desulfurization tower after the pH value is measured to be less than 4.5, carrying out liquid-solid separation, conveying the solution containing 105g/l of zinc to a zinc sulfate refining process, and returning the slag to a pyrometallurgical furnace for batching. And (3) the slurry at the bottom of the second-section foam desulfurization tower passes through a circulating tank, is supplemented into a transfer tank, is mixed with fresh slurry of a foaming agent, is adjusted to have a zinc-sulfur ratio of 1.1, and returns to a liquid storage tank at the bottom of the first-section foam desulfurization tower for circulating desulfurization.
3. refining zinc sulfate, namely adjusting the temperature of the zinc sulfate solution in the previous process to 60-70 ℃, respectively adding purifying agents such as zinc powder and antimony white powder according to the theoretical amount of 1.2 times to perform two-stage continuous countercurrent purification, wherein the concentration of zinc in the purification end point solution is 120g/l, the concentration of copper and nickel is less than 20mg/l, performing filter pressing to obtain slag, returning the slag to a reduction furnace for blending to further recover valuable metals such as tin and lead, performing conventional evaporation concentration → crystallization separation → air drying → packaging on the filtrate, wherein the evaporation concentration end point temperature is not more than 60 ℃, and the crystallization starting temperature is strictly controlled below 39 ℃, thus obtaining an industrial grade zinc sulfate heptahydrate product through the processes, wherein the purity of the zinc sulfate heptahydrate is not less than 98%, and the zinc.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "mounted on" another element, it can be directly mounted on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
The present invention is described in detail and completely by the technical solutions in the above embodiments, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Claims (7)
1. a flue gas desulfurization method using secondary zinc oxide soot as a desulfurizing agent is characterized by comprising the following process steps:
S1, pulping, namely mixing the secondary zinc oxide ash with clear water or return liquid in subsequent processes to prepare pulp, wherein the liquid-solid ratio is controlled to be (5-10): 1, stirring for 10-30 min at normal temperature, and overflowing to obtain slurry with uniform particle size and strong activity;
S2, an oxygen-enriched conversion-foam desulfurization process comprises the following three steps:
S21, an oxygen-enriched foaming process, namely transferring the slurry obtained in the S1 process into a transfer tank, adding a foaming agent with the volume of 1-5% of that of the slurry, injecting the prepared foaming agent slurry into a liquid storage tank of a desulfurization device, and introducing oxygen-enriched air with the oxygen content of 25-40% in volume percentage into the bottom of the liquid storage tank through a foam generator, wherein the foam diameter is 10-25 mm;
S22, a foam desulfurization process, wherein 70-90 ℃ sulfur-containing flue gas is introduced into a bottom flue gas inlet of a desulfurization device in the S21 process, the desulfurization device is in two groups of serial connection and is communicated up and down, two-stage desulfurization of the flue gas is realized through the two groups of serial desulfurization devices, the flue gas is ensured to be discharged up to the standard, the treated qualified flue gas is emptied through a flue gas pipeline, slurry after the flue gas is absorbed enters a circulation regulating pool for recycling, and the slurry after the desulfurization in the circulation regulating pool is qualified through determination of a PH value and a zinc-sulfur ratio and then enters the next process;
S23, a step of filtering desulfurized slurry, which is to perform clarification and separation on the qualified slurry with the pH value of 3-5 and the zinc-sulfur ratio of 0.8-1.0 after the step of S22, to obtain bottom slurry, return the bottom slurry to a furnace for batching after filter pressing, and mix the filter liquor after filter pressing with the supernatant of a transfer tank to obtain zinc sulfate solution to enter the next step;
S3, a zinc sulfate refining process comprises the following two steps:
S31, a purification and impurity removal process, namely maintaining the temperature of the zinc sulfate solution obtained in the S23 at 60-70 ℃, adjusting the pH value of the solution to 4.0-5.0, adding a purifying agent with the impurity theoretical amount of 1.2 times, performing two-stage continuous countercurrent purification, performing filter pressing to obtain slag, returning the slag to a reduction furnace for batching, further recovering valuable metals, and allowing the filtrate to enter the next process;
S32, a concentration and crystallization process, namely evaporating and concentrating the filtrate obtained in the S31 process, performing crystallization separation, air drying, and packaging a series of conventional processes to obtain an industrial grade zinc sulfate heptahydrate product, wherein the purity of the zinc heptahydrate is more than or equal to 98%, and the zinc content is more than or equal to 21%.
2. The method for desulfurizing flue gas by using zinc hypoxide soot as desulfurizing agent according to claim 1, wherein the foaming agent is one or more of sulfuric acid group and sulfonic acid group, and the purifying agent is one or more of zinc powder and antimony white powder.
3. the method of claim 2, wherein the desulfurization unit has a column-like structure with narrow upper and lower parts, a middle part and a wide middle part, the lower narrow part is a liquid reservoir, the middle wide part is a foam layer, the upper narrow part is a partition layer, sulfur-containing flue gas is introduced from the lower part of the desulfurization unit, and the foam layer is fully absorbed in the middle wide part.
4. The method for flue gas desulfurization using zinc hypoxide soot as a desulfurizing agent according to claim 3, wherein a stirring device is installed in the transition tank, the slurry is pumped to each process step through a slurry pump, and a venturi structure is installed inside the foam generator.
5. The flue gas desulfurization method using zinc hypoxide soot as a desulfurizing agent according to claim 4, wherein the filter press operation is performed by using a plate and frame filter press.
6. the method for desulfurizing flue gas by using zinc hypoxide soot as desulfurizing agent according to claim 5, wherein the normal temperature environment is 20-25 ℃.
7. The method for desulfurizing flue gas by using zinc hypoxide soot as desulfurizing agent according to claim 6, wherein the desulfurizing device is composed of two series-connected sets including a first desulfurizing tower and a second desulfurizing tower, and flue gas flows from the bottom of the first desulfurizing tower to the top and then flows into the bottom of the second desulfurizing tower again.
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| CN201910921186.7A CN110559818A (en) | 2019-09-27 | 2019-09-27 | Flue gas desulfurization method using secondary zinc oxide soot as desulfurizer |
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| CN201910921186.7A CN110559818A (en) | 2019-09-27 | 2019-09-27 | Flue gas desulfurization method using secondary zinc oxide soot as desulfurizer |
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| CN111850309A (en) * | 2020-07-23 | 2020-10-30 | 宝武集团环境资源科技有限公司 | Method and device for treating secondary zinc oxide dust |
| CN116116206A (en) * | 2022-12-16 | 2023-05-16 | 河北博泰环保科技有限公司 | Synergistic desulfurization method using secondary zinc oxide secondary dust |
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| CN116116206A (en) * | 2022-12-16 | 2023-05-16 | 河北博泰环保科技有限公司 | Synergistic desulfurization method using secondary zinc oxide secondary dust |
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Application publication date: 20191213 |