CN117107054A - Composite binder for agglomeration of zinc-containing solid wastes and agglomeration method of zinc-containing solid wastes - Google Patents
Composite binder for agglomeration of zinc-containing solid wastes and agglomeration method of zinc-containing solid wastes Download PDFInfo
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- CN117107054A CN117107054A CN202311059688.6A CN202311059688A CN117107054A CN 117107054 A CN117107054 A CN 117107054A CN 202311059688 A CN202311059688 A CN 202311059688A CN 117107054 A CN117107054 A CN 117107054A
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- containing solid
- solid waste
- agglomeration
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- 239000002910 solid waste Substances 0.000 title claims abstract description 77
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 title claims abstract description 76
- 229910052725 zinc Inorganic materials 0.000 title claims abstract description 76
- 239000011701 zinc Substances 0.000 title claims abstract description 76
- 239000011230 binding agent Substances 0.000 title claims abstract description 68
- 238000005054 agglomeration Methods 0.000 title claims abstract description 43
- 230000002776 aggregation Effects 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 43
- 239000002131 composite material Substances 0.000 title claims abstract description 38
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 84
- 229910052742 iron Inorganic materials 0.000 claims abstract description 42
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 15
- 238000002156 mixing Methods 0.000 claims abstract description 8
- 239000000203 mixture Substances 0.000 claims description 14
- 239000002245 particle Substances 0.000 claims description 10
- 239000010802 sludge Substances 0.000 claims description 6
- 229910052710 silicon Inorganic materials 0.000 claims description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 239000010703 silicon Substances 0.000 claims description 2
- 239000004484 Briquette Substances 0.000 claims 1
- 239000000440 bentonite Substances 0.000 abstract description 11
- 229910000278 bentonite Inorganic materials 0.000 abstract description 11
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 abstract description 11
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 239000000126 substance Substances 0.000 abstract description 3
- 239000002253 acid Substances 0.000 abstract 1
- 150000002894 organic compounds Chemical class 0.000 abstract 1
- 239000011499 joint compound Substances 0.000 description 14
- 239000008188 pellet Substances 0.000 description 14
- 239000000428 dust Substances 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 6
- 238000001035 drying Methods 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 239000002956 ash Substances 0.000 description 5
- 230000009172 bursting Effects 0.000 description 5
- 238000010304 firing Methods 0.000 description 5
- 239000012535 impurity Substances 0.000 description 5
- 238000005453 pelletization Methods 0.000 description 5
- 238000007605 air drying Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- QJZYHAIUNVAGQP-UHFFFAOYSA-N 3-nitrobicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic acid Chemical compound C1C2C=CC1C(C(=O)O)C2(C(O)=O)[N+]([O-])=O QJZYHAIUNVAGQP-UHFFFAOYSA-N 0.000 description 3
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000004021 humic acid Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000001768 carboxy methyl cellulose Substances 0.000 description 2
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 2
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000009270 solid waste treatment Methods 0.000 description 2
- 239000002912 waste gas Substances 0.000 description 2
- 239000004115 Sodium Silicate Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229940068041 phytic acid Drugs 0.000 description 1
- 239000000467 phytic acid Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
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
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)
Abstract
The invention provides a composite binder for agglomeration of zinc-containing solid wastes and an agglomeration method of the zinc-containing solid wastes, wherein the composite binder comprises the following components in percentage by mass: 5-10:8-12 of iron mud, an MHA binder and water. The agglomeration method of the zinc-containing solid waste comprises the following steps: adding the composite binder into zinc-containing solid waste, mixing, and agglomerating; wherein the mass of the composite binder is 0.8-1.2% of the mass of the zinc-containing solid waste. According to the invention, the bentonite is replaced by the iron mud, so that the grade of the metallized agglomerate can be effectively improved, and the energy consumption is reduced; meanwhile, the addition of the organic compound plant acid substance binder can reduce the introduction of harmful elements and improve the falling strength and compressive strength of the agglomeration.
Description
Technical Field
The invention relates to the technical field of metal solid waste treatment, in particular to a composite binder for agglomeration of zinc-containing solid waste and an agglomeration method of the zinc-containing solid waste.
Background
Along with the mass use of economic burden and scrap steel by iron and steel enterprises, the zinc content in furnace dust and dust mud in each working procedure is greatly increased, and the reutilization of iron-containing solid waste in the steel process is restricted. The zinc-containing solid waste mainly exists in blast furnace dust (cloth bag dust or venturi gas mud), converter OG mud or LT dust, electric furnace dust and the like. The fly ash has the other characteristic of containing a large amount of iron elements, is an important resource which can be recycled by iron and steel enterprises, but contains harmful elements, so that the recycling process is more complex. Therefore, researchers have developed a variety of process technologies for comprehensive recycling of zinc and iron and other useful elements, including raw material pretreatment, melt separation (blast furnace, etc.), and solid separation (rotary kiln, rotary hearth furnace, etc.) processes.
For a typical zinc-containing solid waste treatment process of a rotary hearth furnace in the steel industry, pretreatment processes such as mixing, pelletizing, drying, screening and the like are required to be carried out on the zinc-containing solid waste, the pelletizing quality plays a crucial role in the subsequent process, and in the pelletizing process, the selection of a binder is a key factor of the pelletizing quality.
The existing zinc-containing solid waste binder is still selected by referring to the pellet binder, and bentonite with the configuration not exceeding 2% of the total mixture mass is selected. Bentonite is the most widely applied inorganic binder in the production of iron and steel enterprises at present, has the characteristics of low cost, availability, sufficient resources, good balling and anti-cracking performance and the like, but can reduce the grade of pellet iron, increase the amount of ironmaking slag, improve the energy consumption and pollute the environment. The organic binder has the advantages of small dosage, less impurities, improvement of the grade of the pellet iron and the like, but has the problems of difficult addition and mixing, poor balling performance, poor heat performance of the green block, high production cost and the like, thereby influencing the wide application. Thus, the development of composite organic binders is an important direction of application for future agglomeration binders.
CN104988308A discloses an iron-rich composite binder for iron ore pellets, a preparation method and application thereof, wherein 10% of carboxymethyl cellulose (CMC) is added into iron mud, and the double binding effect of sodium silicate and tackifier in the iron mud is utilized to replace bentonite to realize the binding effect on the iron ore pellets, so that the balling performance of iron ore powder can be improved, and the falling strength and compressive strength of green pellets are improved. However, the existing carboxymethyl cellulose organic binder and petri poly binder have the defects of easy bursting of green pellets and poor pelletizing strength during preheating and heating, and the composite binder doped with bentonite can reduce the iron grade, and the introduced impurities can also deteriorate the metallurgical performance of the product, thus causing environmental pollution.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a composite binder for agglomeration of zinc-containing solid wastes and an agglomeration method of the zinc-containing solid wastes, wherein the binder is used for assisting in realizing the agglomeration process of the zinc-containing solid wastes, reducing introduced impurities, improving the agglomeration strength and providing high-quality raw materials for iron making and steel making.
In order to achieve the aim, the invention provides a composite binder for zinc-containing solid waste agglomeration, which comprises the following components in percentage by mass: 5-10:8-12, an MHA binder (humic acid binder) and water.
Compared with the traditional bentonite agglomeration process, the binder disclosed by the invention adopts the iron mud to replace bentonite, and the organic binder is added according to a certain proportion, so that the agglomeration strength can be effectively improved, the agglomeration is not easy to burst, al and Si elements are introduced as little as possible, the environmental pollution is avoided, and meanwhile, the organic binder can be consumed in the roasting process, and the iron grade and porosity of the agglomeration are improved.
Compared with carboxymethyl cellulose used in the prior art, the humic acid type pellet baking agent is introduced, so that the strength of the pellet at the later stage can be improved, the state is stable during baking, and burst is not easy to occur.
The composite binder for the zinc-containing solid waste agglomeration is preferably characterized in that the silicon content and the aluminum content in the iron sludge are respectively lower than 25 weight percent.
The composite binder for the zinc-containing solid waste agglomeration preferably has a particle size composition of more than 90% of particles smaller than 300 mesh.
The composite binder for the zinc-containing solid waste agglomeration is preferably such that the water content of the iron sludge is less than 5wt%.
The invention also provides a method for agglomerating zinc-containing solid waste, which comprises the following steps: adding the composite binder into zinc-containing solid waste, mixing, and agglomerating;
wherein the mass of the composite binder is 0.8-1.2% of the mass of the zinc-containing solid waste;
the composite binder is the composite binder for the zinc-containing solid waste agglomeration.
The method for agglomerating the zinc solid waste reduces the introduction of new impurities, and simultaneously adds the iron mud, thereby effectively improving the iron grade and being beneficial to the treatment of subsequent procedures.
In the above method for agglomerating zinc-containing solid waste, preferably, the particle size of the zinc-containing solid waste is less than 200 mesh, and the content of solid waste particles is 60% or more.
In the above method for agglomerating zinc-containing solid wastes, preferably, the water content of the zinc-containing solid wastes is less than 5wt%.
In the above method for agglomerating zinc-containing solid wastes, preferably, the agglomeration is cylindrical in shape, and its diameter and height are 8-15mm.
According to the specific embodiment of the present invention, preferably, the above-mentioned agglomeration method of zinc-containing solid wastes includes the following steps:
(1) Drying and grinding zinc-containing solid waste to ensure that the solid waste particles with the granularity smaller than 200 meshes are more than 60 percent and the water content is lower than 5 percent;
(2) The mass ratio is 100:5-10:10 iron mud, MHA and water are uniformly mixed to obtain a composite binder, the composite binder is added into zinc-containing solid waste and mixed, and the composite binder accounts for 0.8-1.2% of the mass of the zinc-containing solid waste to obtain a mixture;
(3) And (3) performing agglomeration molding on the mixture by adopting a briquetting machine to obtain zinc-containing solid waste agglomeration.
In the step (3), the processing capacity of each briquetting machine is 35t/h, and the briquetting machines press fully mixed materials into cylinders, and the diameter direction and the height direction are both 8-15mm. The zinc-containing solid waste cold agglomeration is obtained by the agglomeration method, and is transported to a main machine of a chain grate machine, a rotary kiln and a ring cooler to form a roasting system; the green blocks are dried and preheated on a grate, baked and solidified in a rotary kiln and cooled in a ring cooler.
The invention also provides a zinc-containing solid waste agglomeration obtained by the zinc-containing solid waste agglomeration method.
The technical scheme provided by the invention has the following beneficial effects:
compared with the agglomeration process of bentonite serving as a binding agent, the agglomeration method disclosed by the invention adopts iron mud to replace bentonite, so that the grade of metallized agglomeration can be effectively improved, and the energy consumption is reduced; meanwhile, the addition of the organic re-phytic acid substance binder can reduce the introduction of harmful elements, improve the falling strength and compressive strength of the pelleting, lighten the burden of the iron-making process for absorbing zinc-containing solid waste to a certain extent, and find a feasible way for the digestion of the gravity ash.
Detailed Description
The technical solution of the present invention will be described in detail below for a clearer understanding of technical features, objects and advantageous effects of the present invention, but should not be construed as limiting the scope of the present invention.
The MHA binder used in the embodiment of the invention is a novel composite binder developed by the university of south and middle school, and the main component of the MHA binder is humic acid substances.
Example 1
The invention provides a method for agglomerating zinc-containing solid waste, which comprises the following steps:
iron mud, MHA binder and water are mixed according to the following ratio of 100:5:10, uniformly mixing the components in a mass ratio to obtain a composite binder;
adding a composite binder into the zinc-containing solid waste, wherein the composite binder accounts for 0.8% of the mass of the zinc-containing solid waste, and obtaining a mixture;
and briquetting the mixture by adopting a briquetting machine with briquetting capacity of 35t/h, wherein the mixture is pressed into cylinders with the diameter direction and the height direction of 12mm, so as to obtain briquettes, namely zinc-containing solid waste briquettes.
Through testing, the falling strength (the number of times of complete falling of the green block is ensured) of the green block is more than 5 times, the compressive strength is more than 15N, and the burst temperature of the green block is more than 600 ℃.
The zinc-containing solid waste obtained in the embodiment is agglomerated and then transported to a main machine of a chain grate machine, a rotary kiln and a ring cooler through a belt to form a roasting system, so that roasting treatment is completed. Wherein the green blocks are dried and preheated on a grate, baked and solidified in a rotary kiln and cooled in a ring cooler.
The chain grate comprises a 4-section, a forced air drying section, an induced draft drying section, a preheating I section and a preheating II section.
The green blocks are dried in the forced air drying section, so that the adhesion water of the green blocks is removed, and meanwhile, the lower green blocks can be prevented from being excessively wet. The hot air flow for forced air drying comes from the third cooling section of the circular cooler, and the hot waste gas of the cooling section is sent to the forced air drying section through a fan and a pipeline system. The temperature of the hot waste gas in the three cooling sections of the annular cooler is 300-350 ℃, so that a cold air valve is arranged on the pipeline, and part of cold air is added, so that the temperature of the blast drying air is controlled to be 180-250 ℃, and the hot air flow is controlled by a fan inlet guide plate, so that the constant pressure of a grate air box is protected. The blast drying section is provided with a bellows.
In the exhausting and drying section, the recovered hot exhaust gas from the heat-resisting fan at the lower part of the preheating section 2 is exhausted downwards from the upper part of the material layer, so that the raw block is dehydrated and dried, and can bear the temperature of more than 700 ℃ of the preheating section 1 without bursting.
In the preheating section I, hot air flow above 700 ℃ passes through the material layer to continuously dry the raw blocks and start oxidation, so that the baked blocks can withstand high temperature above 1000 ℃ in the preheating section 2.
In the preheating section II, the roasting block is further heated and oxidized, and partial consolidation and hardening are completed, so that the raw block has certain strength, can withstand the impact of falling from a grate to a rotary kiln, and is not broken in the rotary motion process of the rotary kiln. The heat source is from the hot air flow at 1050 deg.c in the kiln tail of the rotary kiln.
The temperature of the roasting block at the lowest layer on the grate bed of the grate machine is controlled to be about 750 ℃ when the roasting block leaves the grate machine and enters the rotary kiln, so that the grate plate of the grate machine is not damaged due to the fact that the grate plate of the grate machine is subjected to too high temperature.
The green block is dried and preheated on a grate. The preheated roasting block has enough strength and enters the rotary kiln through a shoveling plate and a large chute. The discharge rate of the shovel plate is generally not more than 3 percent.
The ash box at the head of the chain grate and the bulk cargo at the kiln tail of the rotary kiln enter a special bucket elevator for roasting blocks through an ash bin and return to the rotary kiln, and two bucket elevators are configured for 1 use; the rest ash boxes of the grate and the bulk materials of the air boxes of the grate are transported by 2 buried scraper conveyors and then transported to a briquetting chamber to participate in briquetting by a tape machine. The belt ash conveying system is provided with an environment for dust removal.
The kiln head cover and the kiln tail cover of the rotary kiln adopt sealing devices, the temperature is controlled to 1150-1350 ℃, and a structural cooling fan is arranged.
After the treatment, the roasting ball is obtained. Through testing, the compressive strength of the roasting balls is more than 2620N/roasting balls; the iron grade was 65.15% and the porosity was 21.8%.
Example 2
The invention provides a method for agglomerating zinc-containing solid waste, which is the same as that of example 1, and is characterized in that the mass ratio of iron mud, MHA binder and water is 100:7.5:10.
through testing, the falling strength of the briquettes obtained in the embodiment is more than 6 times, the compressive strength is more than 15N, and the bursting temperature of the briquettes is more than 600 ℃.
The same firing treatment as in example 1 was employed to obtain fired pellets having a compressive strength of > 2648N/piece, an iron grade of 65.22% and a porosity of 22.3%.
Example 3
The invention provides a method for agglomerating zinc-containing solid waste, which is the same as that of example 1, and is characterized in that the mass ratio of iron mud, MHA binder and water is 100:10:10.
through testing, the falling strength of the briquettes obtained in the embodiment is more than 5 times, the compressive strength is more than 15N, and the bursting temperature of the briquettes is more than 600 ℃.
The same firing treatment as in example 1 was employed to obtain fired pellets having a compressive strength of > 2661N/piece, an iron grade of 65.3% and a porosity of 22.6%.
Example 4
The invention provides a method for agglomerating zinc-containing solid waste, which is the same as that of example 1, and is characterized in that the mass ratio of iron mud, MHA binder and water is 100:10:10, the composite binder accounts for 1.2 percent of the mass of the zinc-containing solid waste.
The drop strength of the briquettes obtained in this example is greater than 5 times, the compressive strength is greater than 15N, and the bursting temperature of the briquettes is greater than 600 ℃.
The same firing treatment as in example 1 was employed to obtain fired pellets having a compressive strength of > 2660N/piece, an iron grade of 65.48% and a porosity of 23.1%.
Comparative example 1
The invention provides a method for agglomerating zinc-containing solid waste, which comprises the following steps:
iron sludge, CMA binder, water at a ratio of 100:5:10, uniformly mixing the components in a mass ratio to obtain a composite binder;
adding a composite binder into the zinc-containing solid waste, wherein the composite binder accounts for 0.8% of the mass of the zinc-containing solid waste, and obtaining a mixture;
and briquetting the mixture by adopting a briquetting machine with briquetting capacity of 35t/h, wherein the mixture is pressed into cylinders with the diameter direction and the height direction of 12mm, so as to obtain briquettes, namely zinc-containing solid waste briquettes.
Through testing, the dropping strength (the number of times of complete dropping of the green block is ensured) of the green block is more than 4 times, the compressive strength is more than 13.2N, and the burst temperature of the green block is more than 580 ℃.
The same firing treatment as in example 1 was employed to obtain fired pellets having a compressive strength of > 2628N/piece, an iron grade of 65.11% and a porosity of 18%.
Comparative example 2
The invention provides a method for agglomerating zinc-containing solid waste, which comprises the following steps:
iron mud, bentonite and water are mixed according to the following ratio of 100:5:10, uniformly mixing the components in a mass ratio to obtain a binder;
adding a binder into the zinc-containing solid waste, wherein the binder accounts for 0.8% of the mass of the zinc-containing solid waste, and obtaining a mixture;
and briquetting the mixture by adopting a briquetting machine with briquetting capacity of 35t/h, wherein the mixture is pressed into cylinders with the diameter direction and the height direction of 12mm, so as to obtain briquettes, namely zinc-containing solid waste briquettes.
Through testing, the dropping strength (the number of times of complete dropping of the green block is ensured) of the green block is more than 4 times, the compressive strength is more than 13.2N, and the burst temperature of the green block is more than 580 ℃.
The same firing treatment as in example 1 was employed to obtain fired pellets having a compressive strength of > 2650N/piece, an iron grade of 64.5% and a porosity of 16.8%.
Compared with the existing method for producing zinc-containing solid waste agglomeration by using bentonite as a binder, the agglomeration method provided by the invention has the advantage that the falling strength of the green agglomerates and the compression strength of the baked agglomerates are obviously improved. Meanwhile, other impurities are prevented from being introduced, and the grade of main elements is improved.
Claims (9)
1. The composite binder for the zinc-containing solid waste agglomeration comprises the following components in percentage by mass: 5-10:8-12 of iron mud, an MHA binder and water.
2. The composite binder for zinc-containing solid waste agglomeration according to claim 1, wherein the silicon content and the aluminum content in the iron sludge are respectively lower than 25wt%.
3. The composite binder for zinc-containing solid waste agglomeration of claim 1, wherein the iron sludge has a particle size composition of more than 90% of particles smaller than 300 mesh.
4. The composite binder for zinc-containing solid waste agglomeration of claim 1, wherein the water content of the iron sludge is less than 5wt%.
5. A method of agglomeration of zinc-bearing solid waste comprising: adding the composite binder into zinc-containing solid waste, mixing, and agglomerating;
wherein the mass of the composite binder is 0.8-1.2% of the mass of the zinc-containing solid waste;
the composite binder is the composite binder for zinc-containing solid waste agglomeration according to any one of claims 1 to 4.
6. The method for agglomerating zinc-containing solid wastes according to claim 5, wherein the particle size of the zinc-containing solid wastes is 60% or more in terms of solid waste particles having a particle size of less than 200 mesh.
7. The method for agglomerating zinc-containing solid wastes according to claim 5, wherein the moisture content of the zinc-containing solid wastes is less than 5% by weight.
8. The method for agglomerating zinc-containing solid wastes according to claim 5, wherein the shape of the agglomerate is cylindrical, and the diameter and the height thereof are 8-15mm.
9. A zinc-containing solid waste briquette obtained by the method for briquetting zinc-containing solid waste according to any one of claims 5 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311059688.6A CN117107054A (en) | 2023-08-22 | 2023-08-22 | Composite binder for agglomeration of zinc-containing solid wastes and agglomeration method of zinc-containing solid wastes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311059688.6A CN117107054A (en) | 2023-08-22 | 2023-08-22 | Composite binder for agglomeration of zinc-containing solid wastes and agglomeration method of zinc-containing solid wastes |
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| Publication Number | Publication Date |
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| CN117107054A true CN117107054A (en) | 2023-11-24 |
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| CN202311059688.6A Pending CN117107054A (en) | 2023-08-22 | 2023-08-22 | Composite binder for agglomeration of zinc-containing solid wastes and agglomeration method of zinc-containing solid wastes |
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| Country | Link |
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| CN (1) | CN117107054A (en) |
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- 2023-08-22 CN CN202311059688.6A patent/CN117107054A/en active Pending
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