CN114410963A - Binder for acid-washed sludge and gravity ash cooled agglomerated pellets and preparation method thereof - Google Patents
Binder for acid-washed sludge and gravity ash cooled agglomerated pellets and preparation method thereof Download PDFInfo
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- CN114410963A CN114410963A CN202210094611.1A CN202210094611A CN114410963A CN 114410963 A CN114410963 A CN 114410963A CN 202210094611 A CN202210094611 A CN 202210094611A CN 114410963 A CN114410963 A CN 114410963A
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- 239000008188 pellet Substances 0.000 title claims abstract description 53
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- 230000005484 gravity Effects 0.000 title claims abstract description 42
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- 238000002156 mixing Methods 0.000 claims abstract description 34
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- 239000008158 vegetable oil Substances 0.000 claims abstract description 31
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000000440 bentonite Substances 0.000 claims abstract description 29
- 229910000278 bentonite Inorganic materials 0.000 claims abstract description 29
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- 238000005406 washing Methods 0.000 claims abstract description 17
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- 238000000034 method Methods 0.000 claims description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- 238000001035 drying Methods 0.000 claims description 6
- 238000000465 moulding Methods 0.000 claims description 5
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 229910052717 sulfur Inorganic materials 0.000 claims description 3
- 229910052725 zinc Inorganic materials 0.000 claims description 3
- 239000011701 zinc Substances 0.000 claims description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 2
- 239000006227 byproduct Substances 0.000 claims description 2
- 238000007670 refining Methods 0.000 claims description 2
- 239000011593 sulfur Substances 0.000 claims description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims 2
- 239000004927 clay Substances 0.000 claims 1
- 239000000377 silicon dioxide Substances 0.000 claims 1
- 235000012239 silicon dioxide Nutrition 0.000 claims 1
- 239000002131 composite material Substances 0.000 abstract description 21
- 230000000694 effects Effects 0.000 abstract description 4
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- 229910052751 metal Inorganic materials 0.000 abstract 1
- 239000002184 metal Substances 0.000 abstract 1
- 150000002739 metals Chemical class 0.000 abstract 1
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 238000007711 solidification Methods 0.000 abstract 1
- 230000008023 solidification Effects 0.000 abstract 1
- 239000000428 dust Substances 0.000 description 16
- 230000008569 process Effects 0.000 description 9
- 239000011324 bead Substances 0.000 description 6
- 238000003723 Smelting Methods 0.000 description 5
- 238000005265 energy consumption Methods 0.000 description 5
- 238000005554 pickling Methods 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 239000004484 Briquette Substances 0.000 description 3
- 239000007767 bonding agent Substances 0.000 description 3
- 229910052791 calcium Inorganic materials 0.000 description 3
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 238000003912 environmental pollution Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 229920002472 Starch Polymers 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 238000007596 consolidation process Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- -1 humic acid modified bentonite Chemical class 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000010310 metallurgical process Methods 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 235000010755 mineral Nutrition 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000000053 physical method Methods 0.000 description 2
- 229920002401 polyacrylamide Polymers 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 239000008107 starch Substances 0.000 description 2
- 235000019698 starch Nutrition 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
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- 238000004458 analytical method Methods 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 235000012216 bentonite Nutrition 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 235000011116 calcium hydroxide Nutrition 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000001768 carboxy methyl cellulose Substances 0.000 description 1
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 1
- 229920003123 carboxymethyl cellulose sodium Polymers 0.000 description 1
- 229940063834 carboxymethylcellulose sodium Drugs 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011362 coarse particle Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000004021 humic acid Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 229940050906 magnesium chloride hexahydrate Drugs 0.000 description 1
- DHRRIBDTHFBPNG-UHFFFAOYSA-L magnesium dichloride hexahydrate Chemical compound O.O.O.O.O.O.[Mg+2].[Cl-].[Cl-] DHRRIBDTHFBPNG-UHFFFAOYSA-L 0.000 description 1
- 238000001465 metallisation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001698 pyrogenic effect Effects 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 description 1
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 235000020985 whole grains Nutrition 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/242—Binding; Briquetting ; Granulating with binders
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/248—Binding; Briquetting ; Granulating of metal scrap or alloys
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a binder for acid-washing sludge and gravity ash cooled agglomerated pellets and a preparation method thereof, wherein the binder comprises the following components in percentage by mass: 10-45% of bentonite and 55-90% of vegetable oil asphalt; the preparation method comprises mixing bentonite 10-45% and vegetable oil asphalt 55-90%, and grinding to obtain the composite binder. According to an ideal molecular theory model of the composite binder, vegetable oil asphalt which is rich in hydrophilic groups and has viscosity is selected as an organic component, and the proportion of the inorganic component and the organic component is scientifically regulated and controlled to prepare the composite binder. The composite binder has the advantages of improving the strength of the pellets, low cost, no pollution, no harm and the like on the premise of not influencing the grade of metals in the cold-bonded pellets. The composite binder and the metallurgical solid wastes are subjected to cold solidification pelletizing, so that the valuable elements in the metallurgical solid wastes are recycled, the vegetable oil asphalt with huge yield is absorbed, the resources can be further saved, the cost is reduced, and the effect is improved.
Description
Technical Field
The invention relates to the technical field of secondary resource utilization of acid-washing sludge in a metallurgical process, in particular to a binder for acid-washing sludge cold-bonded pellets.
Background
With the rapid development of the metallurgical industry in China, the influence of dust and mud generated in the production process of iron and steel enterprises on the environment is more and more paid attention by people. The stainless steel can generate a large amount of pickling wastewater after pickling and passivation, and the pickling sludge is neutralized and precipitated to become pickling sludge and has the characteristics of high water content, high TFe, high viscosity and the like. The gravity dust is coarse particles removed by a gravity dust remover, wherein the coarse gas discharged from the top of the blast furnace carries a large amount of dust of raw fuel and particles generated by violent reaction in a high-temperature area. The gravity dust removal ash has the characteristics of high C content, large particles and the like. The acid-washing sludge and the gravity dust removal ash are good metallurgical secondary resources, and the landfill treatment not only increases the space cost and causes environmental pollution, but also can not recycle valuable elements in the dust and mud.
At present, the main ways for recycling the acid-washing sludge include: physical method, wet method, fire method-wet method combined process, pelletizing method and sintering method. The physical method has low harmful element removal efficiency and is only used as a pretreatment process of a wet method or a fire method. The wet method has the problems of serious industrial pollution, high leaching agent consumption, fussy impurity removal and the like. The pyrogenic process has the problems of large metallization rate fluctuation, poor product quality, large energy consumption and the like. The sintering method has the defects of limitation in the granularity of the added dust and mud, difficulty in controlling the dust and mud mixture, cyclic enrichment of harmful elements and the like. The cold-solidified pellet process in the pellet method has the advantages of uniform finished product size, simple process, low energy consumption, simple equipment and the like. Therefore, the cold-bonded pellets are generally used for recycling the dust and mud. The metallurgical dust and mud are cold-solidified and formed and then are put into a blast furnace for use, so that the resource recycling is realized, the environmental pollution is reduced, and the energy consumption is reduced.
The cold consolidation forming process is that various dusts generated in the metallurgical process are added with a binder, mixed uniformly, pressed into a briquette with certain shape, size, density and strength, and then consolidated through corresponding low-temperature drying (less than 300 ℃) to improve the strength of the briquette. The briquette can be used as a raw material for blast furnace smelting, a coolant and a slag former for converter smelting, and can also be used as a raw material for direct reduction and smelting reduction. The key to determining the quality of the cold-bonded pellets is the binder. The binders can be classified according to the main binder components into: inorganic binder, organic binder and composite binder: the inorganic binder mainly comprises: bentonite, water glass, slaked lime, magnesium chloride hexahydrate and the like. The organic binder mainly comprises: polyvinyl alcohol, polyacrylamide, sodium carboxymethyl cellulose, sodium carboxymethyl starch, and the like. The composite binder is formed by combining an organic component and an inorganic component, and has the advantages of both the inorganic binder and the organic binder, so that the composite binder becomes a research hotspot at present. The bentonite has excellent performance, low cost and mature application, but has high burning residue rate, thereby seriously reducing the iron grade of pellet ore, increasing the slag amount of blast furnace ironmaking smelting, reducing the blast furnace coefficient and increasing the fuel consumption; the organic binder has good binding effect and small dosage, but has high price and immature application. Therefore, most of the researchers at present use bentonite-based composite binders for research. Such as: humic acid modified bentonite composite binder, polyacrylamide modified bentonite composite binder and carboxymethyl cellulose sodium modified bentonite composite binder.
The Chinese patent document CN 110629021A provides a binder for normal-temperature consolidation of pellets by converter solid dust waste, and the process adopted by the patent introduces phosphorus element for reducing the plasticity and toughness of steel, thereby hindering the popularization and application of the technology. The chinese patent document CN 109134946 a provides an environment-friendly binder for powdery materials and a preparation method thereof, the binder needs to be dried and crushed for the second time in the preparation process, the preparation process is complex, and the problems of large dust emission, high energy consumption and the like exist. The Chinese patent document CN 109971947A provides a cold-bonded pellet and a preparation and use method thereof, and a mixture of starch and water is used as a binder, so that the problems of high production cost, poor high-temperature performance and the like exist, and the temperature range of a blast furnace, a converter and an electric furnace is difficult to reach. In view of the technical defects, the invention provides a binder for pickling sludge and gravity ash cooled agglomerated pellets.
Disclosure of Invention
In order to achieve the purpose, the invention utilizes an ideal molecular structure model PXYn. In the present invention, the ideal model PXYnComprises a hydrophilic group X which has chemical action with the surface of the mineral powder and a hydrophilic group (Y) which enhances the hydrophilicity of the surface of the mineral; the heat stability is good and the heat stability is good; the appropriate molecular weight (degree of polymerization n). For PXYnThis ideal model employs the HMO algorithm in quantum chemistry, through group electronegativity, ionic bond fraction, CMC calculations, and bond property studies. Further obtains the scientific result that carboxyl (-COOH) is an ideal mineral-philic group, hydroxyl (-OH) is an ideal hydrophilic group, and benzene ring with unsaturated aromatic structure and molecular chain with space network structure are excellent organic frame, and based on the ideal model and the realization that the cost of organic components in the composite binder is higher, the vegetable oil asphalt with high yield and low price contains hydrophilic group carboxyl and hydrophilic group hydroxyl, and the vegetable oil asphalt is used as the organic component of the composite binderThe invention can obtain good bonding performance and reduce the cost of the composite bonding agent, so the bonding agent selects the vegetable oil asphalt as one of the components of the bonding agent.
Specifically, the invention firstly provides a binder for acid-washing sludge and gravity ash cooled agglomerated pellets, which comprises the following components in percentage by mass: 10-45% of bentonite and 55-90% of vegetable oil asphalt.
Furthermore, the mass percent of the bentonite is 40-45%, and the mass percent of the vegetable oil asphalt is 55-60%.
Further, the vegetable oil pitch is a by-product of the refining of vegetable oil.
The invention also provides a preparation method of the binder for the acid-washed sludge and the gravity ash cooled agglomerated pellets, which comprises the steps of mixing 10-45% of bentonite and 55-90% of vegetable oil asphalt, and mixing and grinding the bentonite and the vegetable oil asphalt to obtain the binder.
The invention also provides acid-washed sludge and gravity ash cooled agglomerated pellets, which comprise the following components in percentage by mass: 78.3-82.5% of acid-washing sludge, 15.7-16.5% of gravity ash and 1-6% of binder; wherein the binder comprises the following components in percentage by mass: 10-45% of bentonite and 55-90% of vegetable oil asphalt.
Further, the water content of the acid-washing sludge is 0-5%, the sulfur content is 0-5%, the zinc content in the gravity dedusting ash is 0-1%, the carbon content is 0-50%, and sigma (Na) in the bentonite is++K+)/Σ(Ca2+Mg2+)≥1。
The invention provides a preparation method of acid-washing sludge and gravity ash cooled agglomerated pellets, which comprises the steps of uniformly mixing acid-washing sludge and gravity ash, and adding a binder and water; the mixing amount of the binder is 0.5-8% of the mass of the acid-washed sludge and the gravity ash, and the mixing amount of the water is 3-10%; cold press molding is carried out by adopting the pressure of 25MPa after mixing and grinding to obtain green balls; drying the green balls to obtain balls; wherein the binder comprises the following components in percentage by mass: 10-45% of bentonite and 55-90% of vegetable oil asphalt.
Further, the acid-washed sludge and the gravity dedusting ash are uniformly mixed according to the mass ratio of 5: 1.
Furthermore, the mixing amount of the binder is 1% -6%, and the mixing amount of the water is 8%.
Furthermore, the mass percent of the bentonite in the binder is 40-45%, and the mass percent of the vegetable oil asphalt is 55-60%.
The binder special for acid-washed sludge and gravity ash cooled agglomerated pellets provided by the invention is used for preparing cooled agglomerated pellets from acid-washed sludge and gravity ash, the cost of the binder can be effectively reduced, the strength of the cooled agglomerated pellets is improved, the utilization rate of the acid-washed sludge is fully improved, and the environmental pollution is reduced.
The cold bonded pellet prepared by using the binder, the acid-washing sludge and the gravity ash has the following advantages:
(1) the finished product has uniform size, and does not need to be subjected to whole grain treatment.
(2) The finished product after further processing has a larger repose angle due to the special geometric shape when entering a furnace for smelting, and reduces material segregation.
(3) The ball pressing equipment is simple, the investment is saved, the management is easy, the energy consumption is low, and the method is an energy-saving and environment-friendly agglomeration method.
The invention is a composite binder of organic binder and inorganic binder, and has the advantages of low mixing amount, wide raw material source, friendly production equipment and environment and low cost.
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The technical contents of the preferred embodiments of the present invention will be more clearly and easily understood by referring to the drawings attached to the specification. The present invention may be embodied in many different forms of embodiments and the scope of the invention is not limited to the embodiments set forth herein.
FIG. 1 is a process flow diagram of the present invention. In the embodiment of the invention, the raw materials of acid-washing sludge, gravity dedusting ash and bentonite are provided by a certain stainless steel factory, wherein the water content of the acid-washing sludge is about 55 percent, and the dried chemical components are as follows: 18.4%, 0.57%, 3.13%, 4.67%, 16.97% and 2.09% for TFe, Ni, Cr, S, Ca and Si, respectively; gravitational dedusting ash: TFe, Cr, Zn, Ni, C, Si and Ca are 17.29%, 1.05%, 0.56%, 0.38%, 43.25%, 4.26% and 1.41%, respectively; bentonite: TFe, Al, Si, K, Ca and Ti were 12.63%, 17.64%, 54.57%, 4.22%, 3.39% and 1.48%, respectively.
Example 1
Preparation of binder
The mixing amount of the bentonite is 40 percent and the mixing amount of the vegetable oil asphalt is 60 percent, and the bentonite and the vegetable oil asphalt are mixed and ground for 15-20 minutes to obtain the composite binder.
Preparation of acid-washed sludge and gravity dedusting ash cold-bonded pellets
Uniformly mixing the acid-washed sludge and the gravity dedusting ash according to the proportion of 5:1, adding the binder, wherein the mixing amount of the binder is 2%, and the mixing amount of the water is 8%, mixing and grinding for 15-20 minutes, cooling and standing for 5-10 minutes, performing cold press molding under the pressure of 25MPa to obtain green pellets, wherein the mass of each green pellet is 2.5-3.0g, and drying the green pellets at 120 ℃ for 2 hours to obtain the green pellets. Wherein, the proportion of each component is shown in table 1. The average falling strength of the green pellets was 9 times, and the average compressive strength of the green pellets was 66.4N. The average dropping strength of the beads was 128 times, and the average compressive strength of the beads was 220.92N.
TABLE 1
| Name (R) | Acid-washing sludge | Gravitational dust removal ash | Binder | Water (W) |
| Ratio (%) | 75 | 15 | 2 | 8 |
Example 2
Preparation of binder
The mixing amount of the bentonite is 45 percent and the mixing amount of the vegetable oil asphalt is 55 percent, and the bentonite and the vegetable oil asphalt are mixed and ground for 15 to 20 minutes.
Preparation of acid-washed sludge and gravity dedusting ash cold-bonded pellets
Uniformly mixing the acid-washed sludge and the gravity dedusting ash according to the proportion of 5:1, adding the composite binder, wherein the mixing amount of the composite binder is 4%, the mixing amount of water is 8%, mixing and grinding for 15-20 minutes, cooling and standing for 5-10 minutes, performing cold press molding under the pressure of 25MPa to obtain green pellets, wherein the mass of each green pellet is 2.5-3.0g, and drying the green pellets at 120 ℃ for 2 hours to obtain the green pellets. Wherein the proportion of each component is shown in table 2, the average falling strength of the green pellets is 19 times, and the average compression strength of the green pellets is 79.8N. The average falling strength of the beads was 172 times, and the average compressive strength of the beads was 249.65N.
TABLE 2
| Name (R) | Acid-washing sludge | Gravitational dust removal ash | Binder | Water (W) |
| Ratio (%) | 75 | 15 | 4 | 8 |
Example 3
Preparation of binder
The mixing amount of the bentonite is 45 percent and the mixing amount of the vegetable oil asphalt is 55 percent, and the bentonite and the vegetable oil asphalt are mixed and ground for 15 to 20 minutes.
Preparation of acid-washed sludge and gravity dedusting ash cold-bonded pellets
Uniformly mixing the acid-washed sludge and the gravity dedusting ash according to the proportion of 5:1, adding the composite binder, wherein the mixing amount of the composite binder is 4%, the mixing amount of water is 8%, mixing and grinding for 15-20 minutes, cooling and standing for 5-10 minutes, performing cold press molding under the pressure of 25MPa to obtain green pellets, wherein the mass of each green pellet is 2.5-3.0g, and drying the green pellets at 120 ℃ for 2 hours to obtain the green pellets. Wherein, the proportion of each component is shown in table 3. The average falling strength of the green pellets was 27 times, and the average compressive strength of the green pellets was 89.5N. The average dropping strength of the beads was 210 times, and the average compressive strength of the beads was 216.4N.
TABLE 3
| Name (R) | Acid-washing sludge | Gravitational dust removal ash | Binder | Water (W) |
| Ratio (%) | 72 | 14 | 6 | 8 |
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (10)
1. The binder for the acid-washed sludge and the gravity ash cooled agglomerated pellets is characterized by comprising the following components in percentage by mass: 10-45% of bentonite and 55-90% of vegetable oil asphalt.
2. The binder for acid-washed sludge and gravity ash cooled agglomerated pellets according to claim 1, wherein the bentonite accounts for 40-45% by mass, and the vegetable oil asphalt accounts for 55-60% by mass.
3. The binder for acid-washed sludge and gravity ash cooled agglomerated pellets of claim 1, wherein the vegetable oil pitch is a by-product of vegetable oil refining.
4. A preparation method of a binder for acid-washed sludge and gravity ash cooled agglomerated pellets is characterized in that the binder is obtained by mixing 10-45% of bentonite and 55-90% of vegetable oil asphalt and grinding the bentonite and the vegetable oil asphalt.
5. The acid-washed sludge and gravity ash cooled agglomerated pellets are characterized by comprising the following components in percentage by mass: 78.3-82.5% of acid-washing sludge, 15.7-16.5% of gravity ash and 1-6% of binder; wherein the binder comprises the following components in percentage by mass: 10-45% of bentonite and 55-90% of vegetable oil asphalt.
6. The acid-washed sludge and gravity ash cooled agglomerated pellets of claim 5, wherein the acid-washed sludge has a water content of 0-5%, a sulfur content of 0-5%, a zinc content of 0-1%, a carbon content of 0-50% in the gravity ash, and sigma (Na) in the bentonite clay++K+)/Σ(Ca2+Mg2+)≥1。
7. A preparation method of acid-washed sludge and gravity ash cooled agglomerated pellets is characterized in that the acid-washed sludge and the gravity ash are uniformly mixed and then added with a binder and water; the mixing amount of the binder is 0.5-8% of the mass of the acid-washed sludge and the gravity ash, and the mixing amount of the water is 3-10%; cold press molding is carried out by adopting the pressure of 25MPa after mixing and grinding to obtain green balls with the granularity of 6.4-12.7 mm; drying the green balls at the temperature lower than 300 ℃ to obtain the green balls; wherein, the content of silicon dioxide in the ball is 0-5.5%, and TFe is not less than 55%; wherein the binder comprises the following components in percentage by mass: 10-45% of bentonite and 55-90% of vegetable oil asphalt.
8. The method for preparing acid-washed sludge and gravity ash cold-bonded pellets according to claim 7, wherein the acid-washed sludge and the gravity dedusting ash are mixed uniformly according to the mass ratio of 5: 1.
9. The method for preparing acid-washed sludge and gravity ash cold-bonded pellets as claimed in claim 7, wherein the mixing amount of the binder is 1% -6% and the mixing amount of the water is 8%.
10. The method for preparing acid-washed sludge and gravity ash cold-bonded pellets as claimed in claim 7, wherein the mass percentage of bentonite in the binder is 40-45%, and the mass percentage of vegetable oil asphalt is 55-60%.
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