CN111893297A - Preparation method of cold-pressed block of converter fly ash - Google Patents
Preparation method of cold-pressed block of converter fly ash Download PDFInfo
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- CN111893297A CN111893297A CN202010783618.5A CN202010783618A CN111893297A CN 111893297 A CN111893297 A CN 111893297A CN 202010783618 A CN202010783618 A CN 202010783618A CN 111893297 A CN111893297 A CN 111893297A
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- 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
- C22B1/244—Binding; Briquetting ; Granulating with binders organic
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- 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
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/02—Working-up flue dust
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- 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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Abstract
The invention relates to the technical field of recycling of solid waste resources, in particular to a preparation method of a converter fly ash cold-pressing block. The preparation method comprises the following operations: adding the crushed iron ore, fluorite, ilmenite and blast furnace slag into the fly ash, mixing to prepare a mixed material containing components in specific percentage, then adding an adhesive, uniformly mixing, pressing into blocks and drying. The preparation method has high yield, and the obtained cold-pressed block has the advantages of good appearance quality, high strength, difficult pulverization and the like, can be applied to cold filling in a steelmaking link, and has great comprehensive benefits of treating solid wastes, protecting the environment, reducing steelmaking cost and the like.
Description
Technical Field
The invention relates to the field of recycling of solid waste resources, in particular to a preparation method of a converter fly ash cold-pressing block.
Background
The dust removal mode in the converter steelmaking process in China includes a wet method and a dry method. The dry dedusting and purifying rate is high, the occupied area of dedusting equipment is small, the maintenance and the management are easy, and the dry dedusting and purifying device is widely used in domestic large-scale iron and steel enterprises in recent years. The dust produced by dry dedusting is dedusting ash. 10-25kg of dust can be generated when 1T of steel is smelted.
In the steelmaking process, because of the high-temperature evaporation in an ignition zone, the iron brought by the floating of carbon monoxide bubbles and the addition of auxiliary materials such as lime and the like in the dry dedusting process, the dedusting ash contains a large amount of heavy metals, has small particles, seriously pollutes air, soil and underground water and causes the loss of a large amount of metal iron.
The recovery mode of the dust removal ash in the prior art is mainly to recycle the ingredients through sintering or to return to a converter for steelmaking after being processed into cold solid balls. The former uses the dust removal ash to replace part of iron ore powder to be matched as sintering raw materials to produce sintering ore, and finally metal iron is recovered by smelting in a blast furnace and a converter, so that the recovery period is relatively long, the cost is relatively high, and the low-melting-point metals such as zinc and the like have high content, thereby greatly influencing the smooth operation of the blast furnace, and causing the digestion treatment capacity and the types of waste steel matched with the converter to be seriously limited. The latter has a relatively short recovery period, but there are problems in the actual production process: if the yield is low, about 55-60%; the cold-setting ball has low strength, a large amount of powder can be generated in the production and conveying processes, the finished product and dust are mixed together and are inconvenient to use, and the screening can cause adverse effects on the environment; high additive formulation, high output weight per ton of ash, high cost of using a recessive process, and the like.
Disclosure of Invention
Aiming at the problems of low yield and high powder output in the cold ball fixing process in the prior art, the invention provides a preparation method of a converter fly ash cold-pressing block.
In order to achieve the purpose of the invention, the embodiment of the invention adopts the following technical scheme:
a preparation method of a converter fly ash cold-pressing block specifically comprises the following operations: adding the crushed iron ore, fluorite, ilmenite and blast furnace slag into dedusting ash, and mixing to prepare a mixed material, wherein the mixed material contains the following components in percentage by weight: 45-57% of TFe, 2-3% of MgO, 12-17% of CaO, and Al2O32.5 to 4.5 percent and TiO20.2-0.4%, S is less than or equal to 0.3%, P is less than or equal to 0.2%, and the balance is other impurities in the raw materials; adding adhesive, mixing, pressing into blocks, and oven drying.
The treatment method takes the dedusting ash of steel making as the main raw material, and the binder is added after the components are proportioned and pressed into the cold-pressed block, the obtained cold-pressed block has high yield, the finished product has the performances of good appearance quality, high strength, difficult pulverization and the like, can be applied to cold filler of a steel making link, and has great comprehensive benefits of treating solid waste, protecting the environment, reducing the steel making cost and the like. Meanwhile, the treatment method not only recovers beneficial components such as Fe, CaO and the like, but also can retain the activity of CaO in the fly ash, so that the obtained cold-pressed block can be directly added into a steelmaking converter, the effects of fluxing slag and strengthening dephosphorization can be achieved in the early stage of steelmaking, the melting rate of lime can be improved, and the lime consumption is reduced. The obtained cold-pressed block can also improve the slag alkalinity of the converter at the initial steelmaking stage and reduce the solubility of MgO in the slag, thereby reducing the erosion of the slag to the furnace lining.
Preferably, the mixed material contains 48-54 wt% of TFe, 2-3 wt% of MgO, 13-16 wt% of CaO and Al2O33 to 4% and TiO20.25～0.35％，S≤0.25％，P≤0.15％。
Preferably, the mixed material contains 50-52 wt% of TFe, 2.5 wt% of MgO, 14.5 wt% of CaO and Al2O33.5% and TiO20.3％，S≤0.2％，P≤0.1％。
Preferably, the adhesive is prepared from the following raw materials in parts by weight: 1-2 parts of soapstone, 3-5 parts of novolac epoxy resin and 0.2-0.5 part of associative polyurethane thickener. The raw materials are matched for use, so that the obtained cold-pressed block has better high-temperature stability. The adhesive can play an excellent bonding role with less dosage, can reduce the amount of impurities brought into a finished product, and reduces the material cost.
Preferably, the adhesive is prepared from the following raw materials in parts by weight: 1.5 parts of soapstone, 4 parts of novolac epoxy resin and 0.35 part of associative polyurethane thickener.
Preferably, the preparation method of the adhesive comprises the following steps: and dissolving the novolac epoxy resin in water to prepare 5-20 wt% of novolac epoxy resin solution, adding the associative polyurethane thickener, uniformly mixing, and adding the soapstone to uniformly disperse, thus obtaining the epoxy resin composition.
Preferably, the method for uniformly mixing after adding the adhesive comprises the following steps: placing the mixed material in a crushing and stirring device in an air atmosphere, and adding the adhesive under the crushing and stirring of 2000-15000 rpm, wherein the mass of the novolac epoxy resin in the adhesive is 1-3% of the mass of the mixed material; crushing and stirring until the mixed material and the adhesive are uniformly mixed. Under the condition of high-speed crushing and stirring, the adhesive is fully contacted with the materials to play a bonding role. Meanwhile, water in the adhesive is fully contacted with calcium oxide in the mixed material under the conditions of high-speed crushing and stirring to react to generate calcium hydroxide and release heat, and the calcium hydroxide reacts with carbon dioxide to generate calcium carbonate, so that the strength of the obtained cold-pressed block can be enhanced, and the phenomenon of pulverization of the cold-pressed block during storage can be reduced.
Preferably, the method for pressing into blocks is as follows: and pressing the uniformly mixed materials for 0.08-0.1 s under the pressure of 10-12 MPa once, maintaining the pressure, exhausting, pressing for 0.07-0.09 s under the pressure of 13-15 MPa, maintaining the pressure, exhausting, and pressing for 0.9-0.95 s under the pressure of 13-15 MPa for molding. The invention can further improve the strength of the obtained cold-pressed block by pressing the material for three times under different pressures.
Preferably, the drying is carried out at 180-220 ℃ until the water content is less than or equal to 2%.
Preferably, the crushing is crushing to D90Is 1.5 to 2 mm.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
The embodiment provides a preparation method of a converter fly ash cold-pressed block, which specifically comprises the following operations:
(1) crushing to D90Adding 1.5-2 mm iron ore, fluorite, ilmenite and blast furnace slag into dedusting ash, and mixing to prepare a mixed material, wherein the mixed material comprises the following components in percentage by weight: TFe 50.5%, MgO 2.5%, CaO14.5%, Al2O33.5％，TiO20.3 percent of S, 0.2 percent of P, and the balance of other impurities in the raw materials;
(2) dissolving 4 parts of F-44 novolac epoxy resin in water to prepare 10 wt% novolac epoxy resin solution, adding 0.35 part of RM-12W associative polyurethane thickener (Dow), mixing uniformly, adding 1.5 parts of soapstone, and dispersing uniformly to obtain the adhesive;
(3) placing the mixed material obtained in the step (1) in a crushing and stirring device in an air atmosphere, adding the adhesive obtained in the step (2) under the crushing and stirring of 10000rpm, wherein the mass of the novolac epoxy resin in the adhesive is 2% of the mass of the mixed material; crushing and stirring until the mixed material is uniformly mixed with the adhesive; keeping the materials in the air atmosphere all the time in the crushing and stirring process;
(4) pressing the uniformly mixed material obtained in the step (3) under the pressure of 11MPa for 0.09s, maintaining pressure and exhausting, pressing under the pressure of 14MPa for 0.08s, maintaining pressure and exhausting, and finally pressing under the pressure of 14MPa for 0.93s (the medium pressure time is 0.03s, the pressurization time is 0.4s, and the pressurization and pressure maintenance time is 0.5s) to prepare a brick shape of 53 multiplied by 110 multiplied by 24mm, so as to obtain a wet pressed block;
(5) and drying the obtained test pressing block at 180-220 ℃ until the water content is less than or equal to 2 percent to obtain the test pressing block.
Example 2
The embodiment provides a preparation method of a converter fly ash cold-pressed block, which specifically comprises the following operations:
(1) crushing to D90Adding 1.5-2 mm iron ore, fluorite, ilmenite and blast furnace slag into dedusting ash, and mixing to prepare a mixed material, wherein the mixed material comprises the following components in percentage by weight: TFe 50%, MgO 2.5%, CaO14.5%, Al2O33.5％，TiO20.3 percent of S, 0.15 percent of P, 0.08 percent of P, and the balance of other impurities in the raw materials;
(2) dissolving 3.5 parts of F-44 novolac epoxy resin in water to prepare 5 WT% novolac epoxy resin solution, adding 0.3 part of DeuRheo WT-10 associated polyurethane thickener (Hamming Sophite), mixing uniformly, adding 1 part of soapstone, and dispersing uniformly to obtain the adhesive;
(3) placing the mixed material obtained in the step (1) in a crushing and stirring device in an air atmosphere, adding the adhesive obtained in the step (2) under the crushing and stirring of 8000rpm, wherein the mass of the novolac epoxy resin in the adhesive is 1.5% of that of the mixed material; crushing and stirring until the mixed material is uniformly mixed with the adhesive; keeping the materials in the air atmosphere all the time in the crushing and stirring process;
(4) pressing the uniformly mixed mixture obtained in the step (3) for 0.08s under the pressure of 10.5MPa, maintaining the pressure and exhausting, pressing for 0.09s under the pressure of 12.5MPa, maintaining the pressure and exhausting, and finally pressing for 0.95s under the pressure of 14.5MPa (the medium pressure time is 0.05s, the pressurization time is 0.4s, and the pressurization and pressure maintenance time is 0.5s) to prepare a brick shape of 50 multiplied by 100 multiplied by 200mm, so as to obtain a wet pressed block;
(5) and drying the obtained test pressing block at 180-220 ℃ until the water content is less than or equal to 2 percent to obtain the test pressing block.
Example 3
The embodiment provides a preparation method of a converter fly ash cold-pressed block, which specifically comprises the following operations:
(1) crushing to D90Adding 1.5-2 mm iron ore, fluorite, ilmenite and blast furnace slag into dedusting ash, and mixing to prepare a mixed material, wherein the mixed material comprises the following components in percentage by weight: TFe 52%, MgO 2.5%, CaO14.5%, Al2O33.5％，TiO20.3 percent of S, 0.17 percent of P, 0.09 percent of P, and the balance of other impurities in the raw materials;
(2) dissolving 4.5 parts of F-44 novolac epoxy resin in water to prepare 15 wt% novolac epoxy resin solution, adding 0.4 part of RM-8W associative polyurethane thickener (Dow), mixing uniformly, adding 2 parts of soapstone, and dispersing uniformly to obtain the adhesive;
(3) placing the mixed material obtained in the step (1) in a crushing and stirring device in an air atmosphere, adding the adhesive obtained in the step (2) under the crushing and stirring of 12000rpm, wherein the mass of the novolac epoxy resin in the adhesive is 2.5% of the mass of the mixed material; crushing and stirring until the mixed material is uniformly mixed with the adhesive; keeping the materials in the air atmosphere all the time in the crushing and stirring process;
(4) pressing the uniformly mixed mixture obtained in the step (3) for 0.1s under the pressure of 11.5MPa, maintaining pressure and exhausting, pressing for 0.07s under the pressure of 14.5MPa, maintaining pressure and exhausting, and finally pressing for 0.9s under the pressure of 14.5MPa (the medium pressure time is 0.05s, the pressurization time is 0.4s, and the pressurization and maintenance time is 0.45s) to prepare a brick shape of 50 multiplied by 60mm, so as to obtain a wet pressed block;
(5) and drying the obtained test pressing block at 180-220 ℃ until the water content is less than or equal to 2 percent to obtain the test pressing block.
Example 4
The embodiment provides a preparation method of a converter fly ash cold-pressed block, which specifically comprises the following operations:
(1) crushing to D90Adding 1.5-2 mm iron ore, fluorite, ilmenite and blast furnace slag into dedusting ash, and mixing to prepare a mixed material, wherein the mixed material comprises the following components in percentage by weight: TFe 48%, MgO 2%, CaO 13%, Al2O33％，TiO20.25 percent of S, 0.21 percent of P, and the balance of other impurities in the raw materials;
(2) dissolving 3 parts of F-44 novolac epoxy resin in water to prepare 5 wt% novolac epoxy resin solution, adding 0.2 part of RM-12W associative polyurethane thickener (Dow), mixing uniformly, adding 1 part of soapstone, and dispersing uniformly to obtain the adhesive;
(3) placing the mixed material obtained in the step (1) in a crushing and stirring device in an air atmosphere, adding the adhesive obtained in the step (2) under the crushing and stirring of 5000rpm, wherein the mass of the novolac epoxy resin in the adhesive is 1% of the mass of the mixed material; crushing and stirring until the mixed material is uniformly mixed with the adhesive; keeping the materials in the air atmosphere all the time in the crushing and stirring process;
(4) pressing the uniformly mixed mixture obtained in the step (3) for 0.09s under the pressure of 10MPa, maintaining pressure and exhausting, pressing for 0.08s under the pressure of 13MPa, maintaining pressure and exhausting, and finally pressing for 0.95s under the pressure of 13MPa (the medium pressure time is 0.05s, the pressurization time is 0.4s, and the pressurization and pressure maintenance time is 0.5s) to prepare a brick shape of 50 multiplied by 100 multiplied by 200mm, so as to obtain a wet pressed block;
(5) and drying the obtained test pressing block at 180-220 ℃ until the water content is less than or equal to 2 percent to obtain the test pressing block.
Example 5
The embodiment provides a preparation method of a converter fly ash cold-pressed block, which specifically comprises the following operations:
(1) crushing to D90Adding 1.5-2 mm iron ore, fluorite, ilmenite and blast furnace slagMixing the fly ash into a mixed material, wherein the mixed material comprises the following components in percentage by weight: 54% of TFe, 3% of MgO, 16% of CaO, and Al2O34％，TiO20.35 percent of the total weight of the raw materials, 0.24 percent of S, 0.13 percent of P and the balance of other impurities in the raw materials;
(2) dissolving 5 parts of F-44 novolac epoxy resin in water to prepare 15 wt% novolac epoxy resin solution, adding 0.5 part of RM-12W associative polyurethane thickener (Dow), mixing uniformly, adding 2 parts of soapstone, and dispersing uniformly to obtain the adhesive;
(3) placing the mixed material obtained in the step (1) in a crushing and stirring device in an air atmosphere, adding the adhesive obtained in the step (2) under the crushing and stirring of 13000rpm, wherein the mass of the novolac epoxy resin in the adhesive is 3% of the mass of the mixed material; crushing and stirring until the mixed material is uniformly mixed with the adhesive; keeping the materials in the air atmosphere all the time in the crushing and stirring process;
(4) pressing the uniformly mixed mixture obtained in the step (3) for 0.08s under the pressure of 12MPa, maintaining pressure and exhausting, pressing for 0.07s under the pressure of 15MPa, maintaining pressure and exhausting, and finally pressing for 0.9s under the pressure of 15MPa (the medium pressure time is 0.05s, the pressurization time is 0.35s, and the pressurization and pressure maintenance time is 0.5s) to prepare a brick shape of 53 multiplied by 110 multiplied by 24mm, so as to obtain a wet pressed block;
(5) and drying the obtained test pressing block at 180-220 ℃ until the water content is less than or equal to 2 percent to obtain the test pressing block.
Example 6
The embodiment provides a preparation method of a converter fly ash cold-pressed block, which specifically comprises the following operations:
(1) crushing to D90Adding 1.5-2 mm iron ore, fluorite, ilmenite and blast furnace slag into dedusting ash, and mixing to prepare a mixed material, wherein the mixed material comprises the following components in percentage by weight: TFe 45%, MgO 2%, CaO 12%, Al2O32.5％，TiO20.2 percent of S, 0.26 percent of P, 0.18 percent of P, and the balance of other impurities in the raw materials;
(2) dissolving 3 parts of F-44 novolac epoxy resin in water to prepare 5 wt% novolac epoxy resin solution, adding 0.2 part of RM-12W associative polyurethane thickener (Dow), mixing uniformly, adding 1 part of soapstone, and dispersing uniformly to obtain the adhesive;
(3) placing the mixed material obtained in the step (1) in a crushing and stirring device in an air atmosphere, adding the adhesive obtained in the step (2) under the crushing and stirring of 2000rpm, wherein the mass of the novolac epoxy resin in the adhesive is 1% of that of the mixed material; crushing and stirring until the mixed material is uniformly mixed with the adhesive; keeping the materials in the air atmosphere all the time in the crushing and stirring process;
(4) pressing the uniformly mixed mixture obtained in the step (3) for 0.09s under the pressure of 10MPa, maintaining pressure and exhausting, pressing for 0.09s under the pressure of 13MPa, maintaining pressure and exhausting, and finally pressing for 0.93s under the pressure of 15MPa (the medium pressure time is 0.03s, the pressurization time is 0.4s, and the pressurization and pressure maintenance time is 0.5s) to prepare a brick shape of 50 multiplied by 100 multiplied by 200mm, so as to obtain a wet pressed block;
(5) and drying the obtained test pressing block at 180-220 ℃ until the water content is less than or equal to 2 percent to obtain the test pressing block.
Example 7
The embodiment provides a preparation method of a converter fly ash cold-pressed block, which specifically comprises the following operations:
(1) crushing to D90Adding 1.5-2 mm iron ore, fluorite, ilmenite and blast furnace slag into dedusting ash, and mixing to prepare a mixed material, wherein the mixed material comprises the following components in percentage by weight: TFe 57%, MgO 3%, CaO 17%, Al2O34.5％，TiO20.4 percent of S, 0.23 percent of P, 0.16 percent of P, and the balance of other impurities in the raw materials;
(2) dissolving 5 parts of F-44 novolac epoxy resin in water to prepare 20 wt% novolac epoxy resin solution, adding 0.5 part of RM-12W associative polyurethane thickener (Dow), mixing uniformly, adding 2 parts of soapstone, and dispersing uniformly to obtain the adhesive;
(3) placing the mixed material obtained in the step (1) in a crushing and stirring device in an air atmosphere, adding the adhesive obtained in the step (2) under the crushing and stirring of 15000rpm, wherein the mass of the novolac epoxy resin in the adhesive is 3% of the mass of the mixed material; crushing and stirring until the mixed material is uniformly mixed with the adhesive; keeping the materials in the air atmosphere all the time in the crushing and stirring process;
(4) pressing the uniformly mixed mixture obtained in the step (3) for 0.08s under the pressure of 12MPa, maintaining pressure and exhausting, pressing for 0.08s under the pressure of 15MPa, maintaining pressure and exhausting, and finally pressing for 0.93s under the pressure of 15MPa (the medium pressure time is 0.03s, the pressurization time is 0.4s, and the pressurization and pressure maintenance time is 0.5s) to prepare a brick shape of 50 multiplied by 60mm, so as to obtain a wet pressed block;
(5) and drying the obtained test pressing block at 180-220 ℃ until the water content is less than or equal to 2 percent to obtain the test pressing block.
Comparative example 1
The comparative example provides a preparation method of a converter fly ash cold-pressed block, which specifically comprises the following operations:
(1) crushing to D90Adding 1.5-2 mm iron ore, fluorite, ilmenite and blast furnace slag into dedusting ash, and mixing to prepare a mixed material, wherein the mixed material comprises the following components in percentage by weight: TFe 50.5%, MgO 2.5%, CaO14.5%, Al2O33.5％，TiO20.3 percent of S, 0.2 percent of P, and the balance of other impurities in the raw materials;
(2) preparing 4 parts of starch into 10 wt% of starch slurry, adding 0.35 part of RM-12W associative polyurethane thickener (Dow), uniformly mixing, adding 1.5 parts of soapstone, and uniformly dispersing to obtain the adhesive;
(3) placing the mixed material obtained in the step (1) in a crushing and stirring device in an air atmosphere, adding the adhesive obtained in the step (2) under the crushing and stirring of 10000rpm, wherein the mass of the novolac epoxy resin in the adhesive is 2% of the mass of the mixed material; crushing and stirring until the mixed material is uniformly mixed with the adhesive; keeping the materials in the air atmosphere all the time in the crushing and stirring process;
(4) pressing the uniformly mixed mixture obtained in the step (3) for 0.09s under the pressure of 11MPa, maintaining pressure and exhausting, pressing for 0.08s under the pressure of 14MPa, maintaining pressure and exhausting, and finally pressing for 0.93s under the pressure of 14MPa (the medium pressure time is 0.03s, the pressurization time is 0.4s, and the pressurization and pressure maintenance time is 0.5s) to prepare a brick shape of 53 multiplied by 110 multiplied by 24mm, so as to obtain a wet pressed block;
(5) and drying the obtained test pressing block at 180-220 ℃ until the water content is less than or equal to 2 percent to obtain the test pressing block.
Comparative example 2
The comparative example provides a preparation method of a converter fly ash cold-pressed block, which specifically comprises the following operations:
(1) crushing to D90Adding 1.5-2 mm iron ore, fluorite, ilmenite and blast furnace slag into dedusting ash, and mixing to prepare a mixed material, wherein the mixed material comprises the following components in percentage by weight: TFe 50.5%, MgO 2.5%, CaO14.5%, Al2O33.5％，TiO20.3 percent of S, 0.2 percent of P, and the balance of other impurities in the raw materials;
(2) dissolving 4 parts of F-44 novolac epoxy resin in water to prepare 10 wt% novolac epoxy resin solution, and then adding 1.5 parts of soapstone to disperse uniformly to obtain the adhesive;
(3) placing the mixed material obtained in the step (1) in a crushing and stirring device in an air atmosphere, adding the adhesive obtained in the step (2) under the crushing and stirring of 10000rpm, wherein the mass of the novolac epoxy resin in the adhesive is 2% of the mass of the mixed material; crushing and stirring until the mixed material is uniformly mixed with the adhesive; keeping the materials in the air atmosphere all the time in the crushing and stirring process;
(4) pressing the uniformly mixed mixture obtained in the step (3) for 0.09s under the pressure of 11MPa, maintaining pressure and exhausting, pressing for 0.08s under the pressure of 14MPa, maintaining pressure and exhausting, and finally pressing for 0.93s under the pressure of 14MPa (the medium pressure time is 0.03s, the pressurization time is 0.4s, and the pressurization and pressure maintenance time is 0.5s) to prepare a brick shape of 53 multiplied by 110 multiplied by 24mm, so as to obtain a wet pressed block;
(5) and drying the obtained test pressing block at 180-220 ℃ until the water content is less than or equal to 2 percent to obtain the test pressing block.
Comparative example 3
The comparative example provides a preparation method of a converter fly ash cold-pressed block, which specifically comprises the following operations:
(1) crushing to D90Adding 1.5-2 mm iron ore, fluorite, ilmenite and blast furnace slag into dedusting ash, and mixing to prepare a mixed material, wherein the mixed material comprises the following components in percentage by weight: TFe 50.5%, MgO 2.5%, CaO14.5%, Al2O33.5％，TiO20.3 percent of S, 0.2 percent of P, and the balance of other impurities in the raw materials;
(2) dissolving 4 parts of F-44 novolac epoxy resin in water to prepare 10 wt% novolac epoxy resin solution, adding 0.35 part of carboxymethyl cellulose for uniform dispersion, and then adding 1.5 parts of soapstone for uniform dispersion to obtain the adhesive;
(3) placing the mixed material obtained in the step (1) in a crushing and stirring device in an air atmosphere, adding the adhesive obtained in the step (2) under the crushing and stirring of 10000rpm, wherein the mass of the novolac epoxy resin in the adhesive is 2% of the mass of the mixed material; crushing and stirring until the mixed material is uniformly mixed with the adhesive; keeping the materials in the air atmosphere all the time in the crushing and stirring process;
(4) pressing the uniformly mixed mixture obtained in the step (3) for 0.09s under the pressure of 11MPa, maintaining pressure and exhausting, pressing for 0.08s under the pressure of 14MPa, maintaining pressure and exhausting, and finally pressing for 0.93s under the pressure of 14MPa (the medium pressure time is 0.03s, the pressurization time is 0.4s, and the pressurization and pressure maintenance time is 0.5s) to prepare a brick shape of 53 multiplied by 110 multiplied by 24mm, so as to obtain a wet pressed block;
(5) and drying the obtained test pressing block at 180-220 ℃ until the water content is less than or equal to 2 percent to obtain the test pressing block.
Comparative example 4
The comparative example provides a preparation method of a converter fly ash cold-pressed block, which specifically comprises the following operations:
(1) crushing to D90Adding 1.5-2 mm iron ore, fluorite, ilmenite and blast furnace slag into dedusting ash, and mixing to prepare a mixed material, wherein the mixed material comprises the following components in percentage by weight: TFe 50.5%, MgO 2.5%, CaO14.5%, Al2O33.5％，TiO20.3 percent of S, 0.2 percent of P, and the balance of other impurities in the raw materials;
(2) dissolving 4 parts of F-44 novolac epoxy resin in water to prepare 10 wt% novolac epoxy resin solution, adding 0.35 part of RM-12W associative polyurethane thickener (Dow), mixing uniformly, adding 1.5 parts of soapstone, and dispersing uniformly to obtain the adhesive;
(3) placing the mixed material obtained in the step (1) in a crushing and stirring device in an air atmosphere, adding the adhesive obtained in the step (2) under the crushing and stirring of 10000rpm, wherein the mass of the novolac epoxy resin in the adhesive is 2% of the mass of the mixed material; crushing and stirring until the mixed material is uniformly mixed with the adhesive; keeping the materials in the air atmosphere all the time in the crushing and stirring process;
(4) pressing the uniformly mixed mixture obtained in the step (3) by 14MPa for 0.93s (the medium pressure time is 0.03s, the pressurization time is 0.4s, and the pressurization and pressure maintaining time is 0.5s) to prepare a brick shape of 53 multiplied by 110 multiplied by 24mm to obtain a wet pressed block;
(5) and drying the obtained test pressing block at 180-220 ℃ until the water content is less than or equal to 2 percent to obtain the test pressing block.
Comparative example 5
The comparative example provides a preparation method of a converter fly ash cold-pressed block, which specifically comprises the following operations:
(1) crushing to D90Adding 1.5-2 mm iron ore, fluorite, ilmenite and blast furnace slag into dedusting ash, and mixing to prepare a mixed material, wherein the mixed material comprises the following components in percentage by weight: TFe 50.5%, MgO 2.5%, CaO14.5%, Al2O36.5％，TiO20.3 percent of S, 0.2 percent of P, and the balance of other impurities in the raw materials;
(2) dissolving 4 parts of F-44 novolac epoxy resin in water to prepare 10 wt% novolac epoxy resin solution, adding 0.35 part of RM-12W associative polyurethane thickener (Dow), mixing uniformly, adding 1.5 parts of soapstone, and dispersing uniformly to obtain the adhesive;
(3) placing the mixed material obtained in the step (1) in a crushing and stirring device in an air atmosphere, adding the adhesive obtained in the step (2) under the crushing and stirring of 10000rpm, wherein the mass of the novolac epoxy resin in the adhesive is 2% of the mass of the mixed material; crushing and stirring until the mixed material is uniformly mixed with the adhesive; keeping the materials in the air atmosphere all the time in the crushing and stirring process;
(4) pressing the uniformly mixed mixture obtained in the step (3) for 0.09s under the pressure of 8MPa, maintaining pressure and exhausting, pressing for 0.08s under the pressure of 11MPa, maintaining pressure and exhausting, and finally pressing for 0.93s under the pressure of 17MPa (the medium pressure time is 0.03s, the pressurization time is 0.4s, and the pressurization and pressure maintenance time is 0.5s) to prepare a brick shape of 53 multiplied by 110 multiplied by 24mm, so as to obtain a wet pressed block;
(5) and drying the obtained test pressing block at 180-220 ℃ until the water content is less than or equal to 2 percent to obtain the test pressing block.
Comparative example 6
The comparative example provides a preparation method of a converter fly ash cold-pressed block, which specifically comprises the following operations:
(1) crushing to D90Adding 1.5-2 mm iron ore, fluorite, ilmenite and blast furnace slag into dedusting ash, and mixing to prepare a mixed material, wherein the mixed material comprises the following components in percentage by weight: TFe 50.5%, MgO 2.5%, CaO 20%, Al2O33.5％，TiO20.3 percent of S, 0.2 percent of P, and the balance of other impurities in the raw materials;
(2) dissolving 4 parts of F-44 novolac epoxy resin in water to prepare 10 wt% novolac epoxy resin solution, adding 0.35 part of RM-12W associative polyurethane thickener (Dow), mixing uniformly, adding 1.5 parts of soapstone, and dispersing uniformly to obtain the adhesive;
(3) placing the mixed material obtained in the step (1) in a crushing and stirring device in an air atmosphere, adding the adhesive obtained in the step (2) under the crushing and stirring of 10000rpm, wherein the mass of the novolac epoxy resin in the adhesive is 2% of the mass of the mixed material; crushing and stirring until the mixed material is uniformly mixed with the adhesive; keeping the materials in the air atmosphere all the time in the crushing and stirring process;
(4) pressing the uniformly mixed mixture obtained in the step (3) for 0.09s under the pressure of 11MPa, maintaining pressure and exhausting, pressing for 0.08s under the pressure of 17MPa, maintaining pressure and exhausting, and finally pressing for 0.93s under the pressure of 17MPa (the medium pressure time is 0.03s, the pressurization time is 0.4s, and the pressurization and pressure maintenance time is 0.5s) to prepare a brick shape of 53 multiplied by 110 multiplied by 24mm, so as to obtain a wet pressed block;
(5) and drying the obtained test pressing block at 180-220 ℃ until the water content is less than or equal to 2 percent to obtain the test pressing block.
Examination example
The results of the examination of the low-temperature reduction degradation rate and the expansion rate after the converter fly ash cold-pressed blocks obtained in the above examples 1 to 7 and comparative examples 1 to 6 were placed for 30 days at 30 ± 5 ℃ and 45% ± 5% RH, after which 100 blocks were arbitrarily selected, and the test results are shown in table 1:
TABLE 1 compressive Strength, powdering ratio and expansion ratio
The results show that the converter fly ash cold-pressed block prepared by the preparation method provided by the embodiment of the invention has higher compressive strength, excellent anti-pulverization performance and extremely low expansion rate, and the performance of each aspect is superior to that of each proportion.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents or improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. The preparation method of the cold pressing block for the converter fly ash is characterized by comprising the following operations: adding the crushed iron ore, fluorite, ilmenite and blast furnace slag into dedusting ash, and mixing to prepare a mixed material, wherein the mixed material contains the following components in percentage by weight: 45-57% of TFe, 2-3% of MgO, 12-17% of CaO, and Al2O32.5 to 4.5 percent and TiO20.2-0.4%, S is less than or equal to 0.3%, and P is less than or equal to 0.2%; adding adhesive, mixing, pressing into blocks, and oven drying.
2. The method for preparing the cold pressed block of converter fly ash according to claim 1, wherein the mixed material comprises 48-54 wt% of TFe, 2-3 wt% of MgO, 13-16 wt% of CaO and Al2O33 to 4% and TiO20.25～0.35％，S≤0.25％，P≤0.15％。
3. The converter dedusting ash cooler of claim 2The preparation method of the briquette is characterized in that the mixed material contains 50-52 wt% of TFe, 2.5 wt% of MgO, 14.5 wt% of CaO and Al2O33.5% and TiO20.3％，S≤0.2％，P≤0.1％。
4. The method for preparing the cold pressing block of converter fly ash according to claim 1, wherein the binder is composed of the following raw materials in parts by weight: 1-2 parts of soapstone, 3-5 parts of novolac epoxy resin and 0.2-0.5 part of associative polyurethane thickener.
5. The method for preparing the cold pressing block of converter fly ash according to claim 4, wherein the binder is composed of the following raw materials in parts by weight: 1.5 parts of soapstone, 4 parts of novolac epoxy resin and 0.35 part of associative polyurethane thickener.
6. The method for preparing the cold pressed block of converter fly ash according to claim 4 or 5, wherein the method for preparing the adhesive comprises the following steps: and dissolving the novolac epoxy resin in water to prepare 5-20 wt% of novolac epoxy resin solution, adding the associative polyurethane thickener, uniformly mixing, and adding the soapstone to uniformly disperse, thus obtaining the epoxy resin composition.
7. The method for preparing the cold pressed block of converter fly ash according to claim 6, wherein the method for uniformly mixing after adding the binder comprises the following steps: placing the mixed material in a crushing and stirring device in an air atmosphere, and adding the adhesive under the crushing and stirring of 2000-15000 rpm, wherein the mass of the novolac epoxy resin in the adhesive is 1-3% of the mass of the mixed material; crushing and stirring until the mixed material and the adhesive are uniformly mixed.
8. The method for preparing the cold pressed block of converter fly ash according to claim 7, wherein the method for pressing the cold pressed block into the block is as follows: and pressing the uniformly mixed materials for 0.08-0.1 s under the pressure of 10-12 MPa once, maintaining the pressure, exhausting, pressing for 0.07-0.09 s under the pressure of 13-15 MPa, maintaining the pressure, exhausting, and pressing for 0.9-0.95 s under the pressure of 13-15 MPa for molding.
9. The preparation method of the cold pressed block of converter fly ash according to claim 1, wherein the drying is drying at 180-220 ℃ until the moisture is less than or equal to 2%.
10. The method of making a cold block of converter fly ash according to claim 1, wherein said crushing is to D90Is 1.5 to 2 mm.
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| CN114410879A (en) * | 2021-08-26 | 2022-04-29 | 新疆八一钢铁股份有限公司 | Slagging method for replacing fluorite with tailings and coarse ash pellets |
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