CN114887439A - Lead sulfate particle chemical agglomeration accelerant and application thereof - Google Patents
Lead sulfate particle chemical agglomeration accelerant and application thereof Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 21
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical group N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 claims description 17
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- 235000011130 ammonium sulphate Nutrition 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 13
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D51/00—Auxiliary pretreatment of gases or vapours to be cleaned
- B01D51/02—Amassing the particles, e.g. by flocculation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D49/00—Separating dispersed particles from gases, air or vapours by other methods
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D49/00—Separating dispersed particles from gases, air or vapours by other methods
- B01D49/003—Separating dispersed particles from gases, air or vapours by other methods by sedimentation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/025—Other waste gases from metallurgy plants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a lead sulfate particle chemical agglomeration accelerant and application thereof. The chemical agglomeration promoter comprises water-soluble inorganic polymer, anionic surfactant, specific resistance regulator and other main components. The chemical agglomeration accelerant can reduce the specific resistance of fine-grained lead sulfate particles in lead smelting flue gas, promote the agglomeration of the lead sulfate particles with the particle size of less than 10 microns into large particles, meet the requirement of dust removal on particle size, improve the electrostatic property and further improve the dust removal efficiency of electric dust collection.
Description
Technical Field
The invention relates to a particle chemical agglomeration agent, in particular to a lead sulfate particle chemical agglomeration accelerant, and also relates to an application of the lead sulfate particle chemical agglomeration accelerant in a lead smelting flue gas dust removal process, belonging to the technical field of non-ferrous smelting flue gas dust removal and non-ferrous metal particle recovery.
Background
The PM10 refers to particles with aerodynamic equivalent diameter below 10 microns in ambient air, can be suspended in the air for a long time, has large influence on atmospheric visibility, and is easy to be inhaled by human bodies or other animals to cause a series of diseases due to the characteristics of small particle size, large specific surface area, strong activity, easy attachment of toxic and harmful substances and the like of the PM 10. The nonferrous smelting PM10 has high heavy metal content, and if the nonferrous smelting PM10 enters the atmosphere, the nonferrous smelting PM can cause threat to human health, and therefore, nonferrous smelting factories adopt various types of dust collecting devices.
Different from the coal-fired industry, the valuable metal content of non-ferrous smelting particles usually reaches 50%, the recovery value is high, although the dust removal efficiency of the existing non-ferrous smelting electric dust collection can reach more than 90%, part of PM10 is difficult to remove due to small particle size, high specific resistance and poor electrostatic performance of particles such as lead sulfate and the like, and heavy metals such as lead, zinc, cadmium and the like contained in PM10 enter waste acid generated by a subsequent wet washing process, so that the loss of valuable metals is caused, and the difficulty of subsequent environmental protection treatment is increased; some of the finer particles are even discharged into the atmosphere, posing a greater threat to the ecological environment and human health.
At present, the deep removal technology for fine particulate matters such as PM10 is mainly divided into acoustic agglomeration, electric agglomeration, magnetic agglomeration and chemical agglomeration. The chemical agglomeration technology has the advantages of low cost and high agglomeration efficiency, can effectively remove fine particles in air without changing the existing dust removal technology, has great potential for realizing the synergistic removal of various pollutants, and can simultaneously strengthen the deep recovery of valuable metals in lead smelting. The core of the chemical agglomeration technology lies in selecting a proper agglomerating agent, so that the development of an economical, efficient and environment-friendly agglomerating agent has great significance for research in the field and production and life of people. Meanwhile, how to reduce the specific resistance of lead smelting particles in the chemical agglomeration process is also the key for improving the electric dust collection efficiency.
Disclosure of Invention
Aiming at the defects in the prior art, the first purpose of the invention is to provide a lead sulfate particle chemical agglomeration accelerant, which can reduce the specific resistance of fine-grained lead sulfate particles in lead smelting flue gas, promote lead sulfate particles below 10 microns to agglomerate into large particles, meet the particle size requirement of dust removal, improve the electrostatic property and greatly improve the dust removal efficiency.
The invention also aims to provide the application of the chemical agglomeration accelerant for lead sulfate particles in the dust removal process of the lead smelting flue gas, the specific resistance of the lead sulfate particles can be effectively reduced by spraying the chemical agglomeration accelerant into the flue gas in the dust removal process of the lead smelting flue gas, the wetting of superfine lead sulfate particles is promoted, the agglomeration of fine-grained lead sulfate particles into large particles is facilitated, and the electrostatic property of the lead sulfate particles is improved, so that the dust removal efficiency of the lead smelting flue gas is greatly improved, the pollution of harmful particles is reduced, and the recovery efficiency of valuable metals is improved.
In order to achieve the technical purpose, the invention provides a lead sulfate particle chemical agglomeration accelerant, which comprises the following components in percentage by mass: 0.001-2% of water-soluble inorganic polymer; 0.01 to 0.3 percent of anionic surfactant; 0.1 to 5 percent of specific resistance regulator; water and the balance. The further preferable lead sulfate particle chemical agglomeration accelerant consists of the following components in percentage by mass: 0.5 to 1.5 percent of water-soluble inorganic polymer; 0.1 to 0.3 percent of anionic surfactant; 1 to 4 percent of specific resistance regulator; water and the balance. Further preferred chemical agglomeration promoters are those which increase the median particle size of the lead sulfate particles from about 7 microns to about 27 microns, reduce the proportion of PM10 particles from about 67% to about 12%, and reduce the specific resistance from about 884M Ω · cm to about 63M Ω · cm.
The water-soluble inorganic polymer component adopted by the chemical agglomeration accelerant for lead sulfate particles provided by the invention mainly plays a role in promoting the bonding agglomeration among fine-grained lead sulfate particles; the adopted anionic surfactant mainly plays a role in emulsification and dispersion in a system to play a role in solubilization, and can reduce the surface tension of the chemical agglomeration promoter to facilitate atomization, improve the wetting property of superfine lead sulfate particles, facilitate agglomeration among lead sulfate particles, and improve the surface electrostatic property of the lead sulfate particles; the specific resistance regulator can effectively enhance the conductivity of the lead sulfate particles, reduce the specific resistance of the lead sulfate particles, and is beneficial to improving the electrostatic property of the surfaces of the lead sulfate particles, thereby improving the electrostatic dust removal efficiency. The chemical agglomeration accelerant for lead sulfate particles provided by the invention can effectively reduce the specific resistance and surface tension of lead sulfate particles through the synergistic effect among the water-soluble inorganic polymer, the anionic surfactant and the specific resistance regulator, promotes the wetting of superfine lead sulfate particles, is beneficial to agglomeration of fine-grained lead sulfate particles into large particles, and simultaneously improves the electrostatic property of the lead sulfate particles, thereby greatly improving the dust removal efficiency of lead smelting flue gas.
In a preferred embodiment, the water-soluble inorganic polymer is polyaluminium chloride and/or polyferric sulfate. The optimized water-soluble inorganic polymer has good adhesion, water solubility and temperature resistance, the characteristic of good water solubility can be quickly dissolved in water and spray addition can be realized, the bonding performance is good, the bonding agglomeration among fine-grained lead sulfate particles can be effectively promoted, the temperature resistance is good, and the dust removal requirement of high-temperature smoke can be met. Polyaluminum chloride and polyferric sulfate are conventional commercial products.
As a preferred embodiment, the anionic surfactant is sodium lauryl sulfate. The preferred anionic surfactant has good emulsibility, water solubility and biodegradability, can play a role in solubilization in a system, can reduce the surface tension of the agglomeration agent to facilitate atomization, and can improve the surface electrostatic property of the lead sulfate particles.
Preferably, the specific resistance regulator is ammonium sulfate. Ammonium sulfate is used as the specific resistance regulator, ammonium ions of the ammonium sulfate have a good effect of regulating the specific resistance of the lead sulfate particles, and the sulfate ions of the ammonium sulfate are consistent with anions in the lead sulfate particles, so that new impurities cannot be introduced. Especially, part of ammonium sulfate is heated in the flue to be decomposed to generate NH 3 Can also increase the affinity of the dust surface to ionsThe power is mixed, thereby reducing the specific resistance value of the dust, being beneficial to improving the electric precipitation efficiency, and the generated SO 2 The sulfuric acid can be formed in the subsequent flue gas acid making link. The ammonium sulfate salt is easy to dissolve in water, can improve the ion content on the particle surface, improve the surface conductivity, promote the agglomeration among the lead sulfate particles through the electrostatic action and improve the electrostatic property on the surface of the lead sulfate particles, thereby improving the electrostatic dust removal efficiency
The invention also provides application of the lead sulfate particle chemical agglomeration accelerant to the dust removal process of lead smelting flue gas.
As a preferable scheme, the dust removal is high-temperature electrostatic dust removal or spray dust removal.
The preparation method of the lead sulfate particle chemical agglomeration accelerant comprises the following steps: firstly, adding water into a container, keeping the room temperature and stirring conditions, adding the water-soluble inorganic polymer, the surfactant and the specific resistance regulator according to the proportion, then continuously stirring until all the components are completely dissolved in the water and uniformly mixed, and then packaging for later use.
The lead sulfate particle chemical agglomeration accelerant provided by the invention can be prepared into concentrated solution in advance, and then water is added to dilute the concentrated solution to the required concentration on site when the accelerant is used, so that the product is convenient to store and transport. During the use process, the additive is added into the smoke in a spraying mode.
Compared with the prior art, the technical scheme of the invention has the following beneficial technical effects:
the chemical agglomeration accelerant for lead sulfate particles provided by the invention is composed of a water-soluble inorganic polymer, an anionic surfactant and a specific resistance regulator, and the components have a synergistic effect, so that the specific resistance of fine-grained lead sulfate particles in lead smelting flue gas can be reduced, and the agglomeration of the lead sulfate particles with the particle size of less than 10 microns into large particles is promoted, so that the particle size requirement of dust removal is met, the electrostatic property is improved, and the dust removal efficiency is greatly improved.
The lead sulfate particle chemical agglomeration accelerant provided by the invention has the advantages of good environmental compatibility, simple production process, easy operation, wide component sources and low price.
The application of the lead sulfate particle chemical agglomeration accelerant in the lead smelting flue gas dust removal process is obvious in agglomeration effect of fine-grained lead sulfate particles, the fine lead sulfate particles can be efficiently agglomerated into large-volume particles, and the surface static performance of the fine lead sulfate particles is improved, so that the dust removal efficiency of lead smelting flue gas is greatly improved, the pollution of harmful particles is reduced, and the valuable metal recovery efficiency is improved.
Drawings
FIG. 1 is a graph showing the particle size distribution of lead sulfate particles after different treatments;
FIG. 2 is a scanning electron micrograph of lead sulfate particles after different treatments: a is untreated lead sulfate particles; b and c are 1% PAC + 0.25% SDS + 3% (NH) 4 ) 2 SO 4 Treated lead sulfate particles; c and d are 1% PFS + 0.25% SDS + 1% (NH) 4 ) 2 SO 4 Treated lead sulfate particles.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the summary of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and 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.
The lead sulfate particle chemical agglomeration accelerant comprises the following components in percentage by mass: 0.001-2% of water-soluble inorganic polymer, 0.01-0.3% of anionic surfactant, 0.1-5% of specific resistance regulator and the balance of water. The preferred water-soluble inorganic polymer is polyaluminium chloride or polyferric sulfate, and the preferred specific resistance regulator is ammonium sulfate. The preferred anionic surfactant is sodium lauryl sulfate
When the lead sulfate particle chemical agglomeration accelerant is prepared, water is firstly added into a container, the room temperature and stirring conditions are kept, the water-soluble inorganic polymer, the surfactant and the specific resistance regulator are added according to the proportion, then the stirring is continued until all the components are completely dissolved in the water and are uniformly mixed, and the mixture is packaged for later use. The chemical agglomeration accelerant for lead sulfate particles is prepared by the method.
The method comprises the steps of carrying out a chemical agglomeration experiment by taking lead sulfate particles as representative substances of lead smelting flue gas particles, quantitatively spraying lead sulfate particle chemical agglomeration accelerators from examples 1-4 and comparative examples 1-4 onto the surfaces of the lead sulfate particles in sequence by using spraying, simulating a chemical agglomeration process, carrying out agglomeration growth on the lead sulfate particles under the action of an agglomerating agent, measuring the particle size distribution of the lead sulfate particles by using a laser particle size analyzer before and after the experiment, counting the ratio of the particle sizes of the lead sulfate particles below 10 microns, and measuring the specific resistance of the lead sulfate particles by using a dust specific resistance tester (a four-probe method).
Example 1
Lead sulfate particle chemical agglomeration accelerant: polyaluminium chloride with the concentration of 1 percent; sodium dodecyl sulfate, concentration 0.25%; ammonium sulfate with concentration of 1% and water in balance. After treatment with this solution, the median particle diameter D50 of the lead sulfate particles was 15.895 μ M, the proportion was 27.34% at a particle diameter of 10 μ M, and the specific resistance was found to be 245.81 M.OMEGA.cm.
Example 2
Lead sulfate particle chemical agglomeration accelerant: polyaluminium chloride with the concentration of 1 percent; sodium dodecyl sulfate, concentration 0.25%; ammonium sulfate with a concentration of 3% and the balance water. After treatment with this solution, the median particle diameter D50 of the lead sulfate particles was 27.784 μ M, the ratio was 12.95% at a particle diameter of 10 μ M, and the specific resistance was measured to be 63.12 M.OMEGA.cm.
Example 3
Lead sulfate particle chemical agglomeration accelerant: polymeric ferric sulfate, the concentration is 1%; sodium dodecyl sulfate, concentration 0.25%; ammonium sulfate with concentration of 1% and water in balance. After the treatment with the solution, the median particle diameter D50 of the lead sulfate particles was 24.083 μ M, the ratio of the lead sulfate particles to the particle diameter of 10 μ M was 14.40%, and the specific resistance was found to be 74.27 M.OMEGA.cm.
Example 4
Lead sulfate particle chemical agglomeration accelerant: polymeric ferric sulfate, the concentration is 1%; sodium dodecyl sulfate, concentration 0.25%; ammonium sulfate with a concentration of 3% and the balance water. After the treatment with this solution, the median particle diameter D50 of the lead sulfate particles was 16.299 μ M, the ratio was 26.41% at a particle diameter of 10 μ M, and the specific resistance was measured to be 15.9 M.OMEGA.cm.
Comparative example 1
The formulation used for the chemical agglomeration promoter in this example was substantially the same as that used in example 1, except that ammonium sulfate was not added in this example. After treatment with the solution, the median particle diameter D50 of the lead sulfate particles was 14.143 μ M, the percentage of the lead sulfate particles with a particle diameter of 10 μ M was 36.85%, and the specific resistance was 8291.14 M.OMEGA.cm.
Comparative example 2
The formulation used for the chemical agglomeration promoter in this example was substantially the same as that used in example 3, except that ammonium sulfate was not added in this example. After treatment with this solution, the median particle diameter D50 of the lead sulfate particles was 12.769 μ M, the percentage of particles having a particle diameter of 10 μ M was 37.00%, and the specific resistance was found to be 191.95 M.OMEGA.cm.
Comparative example 3
In the embodiment, only ammonium sulfate is added into the chemical agglomeration accelerant, the concentration is 1 percent, and the balance is water. After treatment with this solution, the median particle diameter D50 of the lead sulfate particles was 11.717 μ M, the ratio was 35.65% at a particle diameter of 10 μ M, and the specific resistance was found to be 16.48 M.OMEGA.cm.
Comparative example 4
In the embodiment, only ammonium sulfate is added into the chemical agglomeration accelerant, the concentration is 3 percent, and the balance is water. After the treatment with this solution, the median particle diameter D50 of the lead sulfate particles was 14.04. mu.m, the content thereof at 10 μ M was 30.47%, and the specific resistance was found to be 12.23 M.OMEGA.cm.
Comparative example 5
In this example, the lead sulfate particles were not treated at all, and the median particle diameter D50 of the lead sulfate particles was 7.778 μ M, the content thereof at 10 μ M was 67.92%, and the measured specific resistance was 884.93M Ω · cm.
The detection and statistical results are shown in the following table, the particle size distribution curve and the electron micrograph of the treated chemical agglomeration agent prepared in the above examples and comparative examples:
the results of the tests and statistics are shown in the following table:
the experimental results of the agglomeration effect test of the soot agglomeration agent prepared in the above examples and comparative examples are shown in the following table:
a large number of research results show that the larger the particle size of the particles is, the more easily the particles are captured by the dust collector, the electrostatic dust collector has lower removal efficiency on high specific resistance particles such as lead sulfate particles, and on one hand, when the high specific resistance dust reaches a dust collecting electrode, the charges are not easily released, and the later charged dust can be rejected; on the other hand, because a larger potential gradient is formed between the smoke dust layers, when the electric field intensity in the smoke dust layers is larger than a critical value, back corona is caused, secondary flying of smoke dust is serious, and dust collection efficiency is reduced. As can be seen from the table, the untreated lead sulfate particles had a median particle diameter D50 of 7.778 μ M, a content ratio of up to 67.92% at a particle diameter of 10 μ M, and a specific resistance of 884.93 M.OMEGA.cm.
As can be seen from FIG. 1, after the treatment with the chemical agglomeration promoter, the particle size distribution curves of the lead sulfate particles are shifted to the right, which shows that the overall particle size increases, wherein 1% PAC + 0.25% SDS + 3% (NH) 4 ) 2 SO 4 And 1% PFS + 0.25% SDS + 1% (NH) 4 ) 2 SO 4 The grain diameter distribution curve of the treated lead sulfate grains is most obvious to move to the right. Taking untreated lead sulfate particles, 1% PAC + 0.25% SDS + 3% (NH) 4 ) 2 SO 4 And 1% PFS + 0.25% SDS + 1% (NH) 4 ) 2 SO 4 The treated lead sulfate particles are analyzed by a scanning electron microscope, and as can be seen from fig. 2, the untreated lead sulfate particles (fig. 2-a) are relatively loose in whole and have small particle size; and 1% PAC + 0.25% SDS + 3% (NH) 4 ) 2 SO 4 (FIGS. 2-b and 2-c) and 1% PFS + 0.25% SDS + 1% (NH) 4 ) 2 SO 4 The particle size of the treated lead sulfate particles is increased (fig. 2-d and fig. 2-e), which is caused by the adhesion, adsorption and bridging of the chemical agglomeration promoter, so that the lead sulfate particles are aggregated and grown to form large agglomerates.
By analyzing the proportion of the lead sulfate particles D50 and PM10 under different treatmentsAs is clear from the results of comparison example 1, the specific resistance of the soot was rather increased when treated with the solutions containing only PAC and SDS, while in examples 1 and 2, PAC + SDS and (NH) were used 4 ) 2 SO 4 The specific resistance decreased significantly upon treatment, and 1% PAC + 0.25% SDS + 3% (NH) 4 ) 2 SO 4 During treatment, the median particle size of the lead sulfate is increased to 27.784 micrometers, and the proportion of particles with the particle size of 10 micrometers is reduced to 12.95%; comparative example 2, which shows a decrease in dust specific resistance when treated with PFS and SDS alone, and example 3, which shows a decrease in dust specific resistance when treated with 1% PFS + 0.25% SDS + 1% (NH) 4 ) 2 SO 4 During treatment, the median particle size of the lead sulfate is increased to 24.083 micrometers, and the proportion of particles with the particle size of 10 micrometers is reduced to 14.40%; in comparative examples 3 and 4, only the ammonium sulfate solution treated the lead sulfate particles, although the specific resistance was lowered, the effect of increasing the particle size of the lead sulfate particles was inferior to that of examples 2, 3 and 4.
As is clear from the results of the experiments, PAC, PFS, SDS + (NH) were used 4 ) 2 SO 4 The compound solution can promote the growth of lead sulfate particles and the reduction of specific resistance to a greater extent, and integrates the particle size increasing effect and the reduction of the specific resistance of the lead sulfate particles, and 1 percent PAC +0.25 percent SDS +3 percent (NH) is used 4 ) 2 SO 4 And 1% PFS + 0.25% SDS + 1% (NH) 4 ) 2 SO 4 The treatment effect is best.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (7)
1. A lead sulfate particle chemical agglomeration accelerant is characterized in that: the paint comprises the following components in percentage by mass:
0.001-2% of water-soluble inorganic polymer;
0.01 to 0.3 percent of anionic surfactant;
0.1 to 5 percent of specific resistance regulator;
water and the balance.
2. The accelerator for chemical agglomeration of lead sulfate particles according to claim 1, wherein: the composite material comprises the following components in percentage by mass:
0.5 to 1.5 percent of water-soluble inorganic polymer;
0.1 to 0.3 percent of anionic surfactant;
1 to 4 percent of specific resistance regulator;
water and the balance.
3. A lead sulfate particle chemical agglomeration enhancer as claimed in claim 1 or 2, wherein: the water-soluble inorganic polymer is polyaluminium chloride and/or polyferric sulfate.
4. A lead sulfate particle chemical agglomeration enhancer as claimed in claim 1 or 2, wherein: the anionic surfactant is sodium dodecyl sulfate.
5. A lead sulfate particle chemical agglomeration enhancer as claimed in claim 1 or 2, wherein: the specific resistance regulator is ammonium sulfate.
6. Use of a lead sulphate particle chemical agglomeration promoter according to any one of claims 1 to 5, wherein: the method is applied to the dust removal process of the lead smelting flue gas.
7. Use of a lead sulphate particle chemical agglomeration accelerant according to claim 6, wherein: the dust removal is high-temperature electrostatic dust removal or spray dust removal.
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| CN101513583A (en) * | 2009-02-16 | 2009-08-26 | 华中科技大学 | Coal-fired ultrafine grain chemical agglomeration promotor |
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| CN101513583A (en) * | 2009-02-16 | 2009-08-26 | 华中科技大学 | Coal-fired ultrafine grain chemical agglomeration promotor |
| CN102513211A (en) * | 2011-12-16 | 2012-06-27 | 江苏瑞帆环保装备股份有限公司 | Method for quenching and tempering dust of sintering machine head and special device thereof |
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