CN113929325B - Method for preparing spherical tetracalcium aluminoferrite solid solution by jointly adopting airflow crushing-radio frequency plasma technology - Google Patents

Method for preparing spherical tetracalcium aluminoferrite solid solution by jointly adopting airflow crushing-radio frequency plasma technology Download PDF

Info

Publication number
CN113929325B
CN113929325B CN202111300237.8A CN202111300237A CN113929325B CN 113929325 B CN113929325 B CN 113929325B CN 202111300237 A CN202111300237 A CN 202111300237A CN 113929325 B CN113929325 B CN 113929325B
Authority
CN
China
Prior art keywords
radio frequency
solid solution
frequency plasma
spherical
preparing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202111300237.8A
Other languages
Chinese (zh)
Other versions
CN113929325A (en
Inventor
孙化强
吴文达
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fuzhou University
Original Assignee
Fuzhou University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fuzhou University filed Critical Fuzhou University
Priority to CN202111300237.8A priority Critical patent/CN113929325B/en
Publication of CN113929325A publication Critical patent/CN113929325A/en
Application granted granted Critical
Publication of CN113929325B publication Critical patent/CN113929325B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B7/00—Hydraulic cements
    • C04B7/36—Manufacture of hydraulic cements in general
    • C04B7/364—Avoiding environmental pollution during cement-manufacturing
    • C04B7/367—Avoiding or minimising carbon dioxide emissions
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B7/00—Hydraulic cements
    • C04B7/36—Manufacture of hydraulic cements in general
    • C04B7/38—Preparing or treating the raw materials individually or as batches, e.g. mixing with fuel
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B7/00—Hydraulic cements
    • C04B7/36—Manufacture of hydraulic cements in general
    • C04B7/43—Heat treatment, e.g. precalcining, burning, melting; Cooling
    • C04B7/44—Burning; Melting
    • C04B7/4453—Burning; Melting using plasmas or radiations

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Ecology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Environmental Sciences (AREA)
  • Public Health (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Plasma & Fusion (AREA)
  • Thermal Sciences (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)

Abstract

The invention belongs to the field of building material preparation, and particularly relates to a method for preparing spherical C by combining airflow crushing-radio frequency plasma technology 4 The process of preparing AF solid solution includes two steps, including the first mixing calcium material, aluminum material, iron material and alkali metal component in the weight proportion of C 4 Mixing and proportioning the chemical dose of the AF solid solution, and carrying out air flow crushing in advance to obtain superfine powder; then the superfine powder is treated by plasma high temperature through a radio frequency plasma system to obtain the C with high activity and sphericization 4 AF solid solution. The invention provides a combined jet milling-radio frequency plasma system for preparing C 4 The AF solid solution breaks through the technical thought inertia of 'two-grinding and one-burning' preparation of portland cement or clinker by single ore, only needs 'one-grinding and one-burning' in the traditional sense, and has the obvious advantage of low carbon. C prepared by the method 4 The AF solid solution has ultrahigh hydration activity and regular spherical morphology, and can be used as a cement concrete additive with ultrahigh strength, high toughness, high wear resistance and high corrosion resistance.

Description

Method for preparing spherical tetracalcium aluminoferrite solid solution by jointly adopting airflow crushing-radio frequency plasma technology
Technical Field
The invention belongs to the field of building material preparation, and particularly relates to a method for preparing spherical tetracalcium aluminoferrite C by jointly adopting an airflow crushing-radio frequency plasma technology 4 A method of AF solid solution.
Background
The production process of silicate cement is summarized as "two-grinding and one-burning", and is characterized by that firstly, the calcareous raw material, alumino-silicate clay and iron correction material are mixed according to a certain proportion, and milled, and then fired in a rotary kiln to obtain silicate clinker, and finally the silicate clinker, gypsum and mixed material are ground again together to obtain different kinds of silicate cement. Reference is also made to this process, both for laboratory and industrial production, and even for the preparation of single clinker minerals. The production energy consumption of the portland cement is high, the process is complex and tedious, and with the deepening of carbon peak reaching/carbon neutralization concept, the energy conservation and emission reduction of the cement industry face huge challenges.
CO currently in cement industry 2 The emission reduction technical measures mainly focus on finding out three cement products with alternative fuels, low calcium clinker and low clinker contentAnd (5) performing side treatment. In the aspect of preparing clinker by using alternative fuels, the replacement rate in China is only less than 2%, and is far lower than the replacement level of developed countries in Europe and America. The cement clinker technology based on the alternative fuel has a promising prospect in hydrogen energy and full electric energy technology, and the clinker can be calcined by adopting the hydrogen energy to reduce CO 2 Discharging more than 30%; the full-electric energy clinker calcining technology has no relevant industrialized data at present, and is mostly a research level in a laboratory. The plasma combustion technology is an oil-free ignition combustion technology which adopts direct current air plasma as an ignition source to realize cold start of a kiln without using one drop of oil, and the application of the prior clinker firing technology mainly focuses on coal powder ignition, so that the technology has obvious low-carbon advantage and higher operation efficiency. The plasma combustion technology can become a great development direction of the all-electric energy clinker calcining technology, and if certain special properties can be simultaneously endowed to cement, the technical advantages of the all-electric energy clinker calcining technology can also be highlighted, which is the CO required by developers in the field 2 The key technology of emission reduction needs to be further broken through in the field.
As the cement components are variable and the microelements exist, the hydration research of the cement is complex and variable, and the hydration characteristics of single clinker minerals are not lost as a better research method. It has been found that certain clinker minerals have particular performance advantages and can be used as an additive to portland cement, even though the content of such minerals is generally low in existing clinker systems. For example, the iron aluminate mineral phase has the characteristics of high later strength increase, good impact resistance and wear resistance and the like, so that a portland cement system with high iron phase content, even a sulphoaluminate cement system, is a new favorite in the industry. As a cement additive, the cement additive needs to be easy to produce and large in amount, and the iron-aluminum phase has a relatively low melting point, so that the ring formation and the skinning of a kiln are easily caused, and the cement additive is difficult to prepare by adopting a traditional kiln. Chinese patent CN102153144A discloses a preparation method of calcium aluminoferrite, but the process is tedious and long in period, and the yield is low; although the synthesis can be carried out at low temperature of 700 ℃, the hydration activity is obviously lower than the iron phase activity of the actual clinker. Patent CN201610109264.X discloses a preparation method of calcium aluminoferrite, which is a method for preparing calcium aluminoferrite mineral according to the traditional 'two-grinding and one-burning' process, and has relatively high energy consumption and no system formed in the process flow.
The above analysis shows that the traditional portland cement clinker sintering mode is difficult to break through the mode of 'two-grinding and one-burning', the novel fuel substitution technology is an important development direction for energy conservation and emission reduction in the sintering measure, and the novel portland cement clinker sintering mode is also suitable for preparing clinker single ore. To C 4 For AF solid solution, the realization of mass production of highly active C is currently lacking 4 The key technology of AF solid solution. If the plasma combustion technique can be introduced into C 4 In the preparation process of AF solid solution, high-activity C is realized 4 Preparation of AF solid solutions in bulk, with simultaneous addition of C 4 The particular properties or functions of AF solid solutions have significant technical advantages.
Disclosure of Invention
The invention aims to provide a compound C 4 Method for producing AF solid solution, C produced by the method 4 The AF solid solution has the characteristics of adjustable sphere rate range, high yield and high hydration activity, short production period and large-scale application; meanwhile, the prior C is broken through in the preparation process 4 The traditional technical route of 'two-grinding (crushing) and one-burning' for preparing AF solid solution provides a novel technical route of 'one-grinding (crushing) and one-burning' for realizing low-energy-consumption preparation.
In order to achieve the above technical objects, the present invention provides the following technical solutions.
Preparation of spherical C by plasma technology 4 The process of preparing AF solid solution includes two steps, including the first mixing calcium material, aluminum material, iron material and alkali metal component in the weight proportion of C 4 Mixing and proportioning the chemical dose of the AF solid solution, and carrying out air flow crushing in advance to obtain superfine powder; then the superfine powder is treated by plasma high temperature through a radio frequency plasma system to obtain high-activity spherical C 4 AF solid solution.
Further, the calcareous raw materials are CaO and CaCO 3 Or Ca (OH) 2 The aluminum raw material is Al (OH) 3 Or gamma-Al 2 O 3 The iron raw material is Fe 2 O 3 Or Fe (OH) 3 (ii) a The alkali metal is Na-containing 2 O or K 2 Carbonate and sulfate of O.
Further, the calcium raw material, the aluminum raw material, the iron raw material and the alkali metal component are mixed according to effective CaO and Al 2 O 3 、Fe 2 O 3 、Na 2 The mass ratio of O to O is 45.62:20.77:32.59, and 1.0, and allowing the mixture to be uniformly mixed and then sending the mixture into a jet milling system.
Further, the jet mill is realized by a jet mill classifier, which mainly comprises:
further, the main operating parameters of the jet mill are: the compressed air flow is 5 to 15L/min, the installed power is 5 to 30Kw, the production capacity is 10 to 150Kg/h, and the discharged particle size is 2 to 75 mu m.
Furthermore, the preferable fineness range of the superfine powder is between 5 and 30 mu m.
The jet mill is connected with a radio frequency plasma system in series for use, specifically, the material outlet airflow of the jet mill is the material carrier gas transport airflow of the radio frequency plasma system, and the integrated series connection from pre-crushing of materials to direct spherical sintering is realized.
Further, the radio frequency plasma system mainly comprises the following parts: the device comprises a radio frequency plasma generator, a radio frequency plasma power supply, a gas and powder supply system, a reaction chamber, a collection chamber, a vacuum pumping system, an electrical control and measurement system and a cooling system.
Further, the operating parameters of the rf plasma are: the frequency is 3.5-5.0 MHz, the power is 30-200 kW, the working gas is high-purity nitrogen or air, and the flame core temperature of the radio frequency plasma generator is 1000-1600 ℃.
The radio frequency plasma generator generates high-temperature gas through electric arc, can work in oxidation, reduction or inert environment, can provide heat source for industrial furnaces with various functions such as gasification, cracking, reaction, melting and smelting and the like, and provides heat source for C 4 Combustion system for AF solid solution production. The ultrahigh flame temperature and the quick contact between the material and the heat source can realize the temperature C 4 The preparation of solid solutions of AF can be completed in a relatively short time.
The core of the invention is that a jet mill and a radio frequency plasma system are jointly adopted, and the gas outlet flow of the jet mill is the carrier gas transport flow of the radio frequency plasma system and is also part of working gas. The combined jet milling and rf plasma system has two technical advantages: on one hand, the production efficiency is improved due to the process connection; on the other hand, the ultrahigh temperature sintering of the plasma generator of the radio frequency plasma system and the rapid cooling of the cooling system lead the liquid-phase C 4 The AF solid solution forms spherical micro powder under the action of surface tension, does not need to be ground again, and realizes C 4 The AF solid solution preparation is 'one grinding and one burning' in the traditional sense, which is a significant breakthrough to the cement clinker burning and the clinker single ore preparation which are usually 'two grinding and one burning', and has obvious low-carbon advantage.
Further, the spherical shape C is preferable 4 The sphericity rate of the AF solid solution is controllable within the range of 50-95%.
The particle size range of the superfine powder obtained by the jet mill is in certain connection with the particle size range of the spherical powder obtained by a plasma spheroidization system, and generally, the discharge particle size range of the plasma combustion system is 1.0 to 2.0 times of the discharge particle size range of jet milling, which is related to the properties of materials.
C prepared by the invention 4 AF solid solutions also have higher activity. In the invention, the transportation and high-temperature sintering of raw materials are carried out in an airflow state, and the sintered C is rapidly cooled by the ultrahigh temperature of the plasma and the cooling system in the material sintering process 4 The AF solid solution is completely mineralized in a shorter contact time, and is more than C prepared by the traditional static sintering 4 AF exhibits a high hydration activity.
Compared with the prior art, the invention has the following beneficial effects:
(1) The method combines a jet mill and a radio frequency plasma system for C 4 Preparing AF solid solution by using the air outlet balloon of a jet mill as a carrier gas transport medium of radio frequency plasma and controlling the fineness range of superfine materials by using the jet millEnclosing the mixture in a range of 5 to 25 mu m, and performing radio frequency plasma high temperature treatment on the mixture to obtain the material C 4 The fineness range of the AF solid solution is 10 to 50 mu m, and the AF solid solution does not need to be ground again. Realize C 4 The preparation of AF solid solution by one grinding and one burning breaks through the thought inertia of the traditional technology of two grinding and one burning for preparing Portland cement or clinker minerals, and has obvious low carbon significance.
(2) The invention provides a C prepared by combining a jet milling-plasma treatment system 4 AF solid solutions have significant characteristics: the plasma combustion system can make the material obtain higher temperature instantly, the raw material is mineralized rapidly, C 4 The yield of AF solid solution is high; cooling system for high temperature C 4 The AF solid solution forms a regular sphere in a cooling link due to the action of surface tension, and the sphere rate can reach 95 percent at most. In addition, the hydration activity of the green stock is further enhanced due to the shorter firing time of the green stock in the plasma treatment system. C prepared by the invention 4 When the AF solid solution is used as a cement concrete additive, the AF solid solution has a certain spherical water reducing function and is beneficial to regulation and control of rheological property of cement concrete. The invention provides a method for preparing C by jointly adopting a jet milling-plasma treatment system 4 The most beneficial effect of AF solid solution is also an obvious technical innovation of the present invention.
(3) C provided by the invention 4 The preparation method of the AF solid solution has high yield and obviously shortened production. High purity C is often required for hydration characteristics studies 4 An AF solid solution; and C is required for cement-based materials with high fracture resistance and high corrosion resistance 4 The AF solid solution is introduced in the form of an additive, when C is present 4 The purity requirement of the AF solid solution is not high. The method provided by the invention can realize C with various purities 4 And (3) preparing the AF solid solution so as to meet the practical requirements of hydration research and additive application.
Drawings
Fig. 1 is a schematic view of a combined jet milling-rf plasma system, wherein a is a jet milling part, which comprises: (1) the gas supply system (2) is provided with a feeding system (3) and a jet milling system (4) is provided with a discharge carrier gas pipeline; the system comprises a radio frequency plasma system part, a carrier gas conveying material pipeline (4), a plasma generator (5), a power supply system (6), a cooling system (7), a sample collecting system (8).
FIG. 2 shows the spherical shape C obtained in examples 1 and 2 4 SEM photograph of AF solid solution, through the ratio of the spherical particles and irregular particles of a large number of statistics same sample, calculate out that the sphericity ratio of example 1 is 75%, the sphericity ratio of example 2 is 90%.
Detailed Description
The following examples are given for the detailed implementation and the specific operation procedures, but the scope of the present invention is not limited to the following examples. The reagent and the bulk industrial raw materials used in the invention are conventional products which can be purchased commercially without being noted by manufacturers.
Example 1
Preparation of spherical C by plasma technology 4 Method for preparing AF solid solution by combining jet mill and radio frequency plasma system 4 The preparation of the AF solid solution specifically comprises the following steps:
(1) Preparation of raw materials: mixing calcium carbonate powder (CaCO) 3 ) Alumina powder (Al) 2 O 3 ) Iron sesquioxide powder (Fe) 2 O 3 ) And sodium sulfate (K) 2 SO 4 ) Accurately weighing the materials according to the mass ratio of 59.74: 15.19: 23.92: 1.05 for standby and mixing the materials uniformly in advance.
(2) And (3) airflow crushing treatment: putting the pre-mixed mixture powder into airflow crushing equipment, wherein the main operation parameters of the airflow crushing machine are as follows: the compressed air flow is 6L/min, the installed power is 30Kw, the production capacity is 100Kg/h, and the discharged particle size is 2 to 60 μm.
(3) The radio frequency plasma high-temperature treatment system comprises the following parts: the device comprises a radio frequency plasma torch, a radio frequency plasma power supply, a gas and powder supply system, a reaction chamber, a collection chamber, a support, a vacuum pumping system, an electrical control and measurement system and a water chilling unit. The operating parameters of the rf plasma generation chamber were: the power is 120Kw, the frequency is 2.8MHz, the working gas is air, and the flame core temperature of the radio frequency plasma generator is 1200-1300 ℃. Wherein the feeding system of the radio frequency plasma is directly connected with the air outlet system of the jet mill.
(4) C 4 Collecting AF solid solution, and collecting the sintered C in a cooling collection chamber 4 AF solid solution.
Example 2
Preparation of spherical C by plasma technology 4 Method for preparing AF solid solution by combining jet mill and radio frequency plasma system 4 The preparation of the AF solid solution specifically comprises the following steps:
(1) Preparation of raw materials: mixing carbide slag powder (Ca (OH) 2 ) Aluminum hydroxide (Al (OH) 3 ) Iron sesquioxide powder (Fe) 2 O 3 ) And potassium sulfate (K) 2 SO 4 ) Accurately weighing according to the mass ratio of 48.10: 25.23: 25.98: 0.59 for standby and mixing uniformly in advance.
(2) And (3) airflow crushing treatment: putting the pre-mixed mixture powder into jet mill, wherein the main operation parameters of the jet mill are as follows: the compressed air flow is 10L/min, the installed power is 60Kw, the production capacity is 130kg/h, the feed particle size is not more than 5mm, the discharge particle size is 2-25 mu m, and the carrier gas flow is nitrogen.
(3) The radio frequency plasma high-temperature treatment system comprises the following parts: the device comprises a radio frequency plasma torch, a radio frequency plasma power supply, a gas and powder supply system, a reaction chamber, a collection chamber, a support, a vacuum pumping system, an electrical control and measurement system and a water chilling unit. The operating parameters of the rf plasma generation chamber were: the power is 180kw, the frequency is 3.5MHz, the working gas is nitrogen, and the flame core temperature of the radio frequency plasma generator is 1300-1400 ℃. Wherein the feeding system of the radio frequency plasma is directly connected with the air outlet system of the jet mill.
(4) C 4 Collecting AF solid solution, and collecting the sintered C in a cooling collection chamber 4 AF solid solution.
Example 3
Preparation of spherical C by plasma technology 4 Method for AF solid solution, combined use of jet mill-radio frequency plasma system for C 4 The preparation of the AF solid solution specifically comprises the following steps:
(1) Preparation of raw materials: mixing calcium carbonate (CaCO) 3 ) Aluminum ash (mainly containing Al) 2 O) 3 ) High iron red mud (Fe) 2 O 3 And the content of alkali metal) in a mass ratio of 45.62: 17.8: 36.52, accurately weighing for later use and mixing uniformly in advance.
(2) And (3) airflow crushing treatment: putting the pre-mixed mixture powder into jet mill, wherein the main operation parameters of the jet mill are as follows: the compressed air flow is 15L/min, the installed power is 60kW, the production capacity is 150kg/h, the feed particle size is not more than 8mm, the discharge particle size is 10-50 mu m, and the carrying air flow is air.
(3) The radio frequency plasma high-temperature treatment is carried out, and a radio frequency plasma system comprises the following parts: the device comprises a radio frequency plasma torch, a radio frequency plasma power supply, a gas and powder supply system, a reaction chamber, a collection chamber, a support, a vacuum pumping system, an electrical control and measurement system and a water chilling unit. The operating parameters of the rf plasma generation chamber were: the power is 150Kw, the frequency is 3.2MHz, the working gas is air, and the flame core temperature of the radio frequency plasma generator is 1250-1350 ℃. The feeding system of the radio frequency plasma is directly connected with the air outlet system of the jet mill, namely the running air flow of the jet mill is the carrier gas transport air flow of the radio frequency plasma system.
(4) Collecting samples, collecting the fired C in a cooling collection chamber 4 AF solid solution.
Comparative example 1
Preparation C in laboratory 4 The method for preparing the AF solid solution specifically comprises the following steps:
(1) Preparation of raw materials: analytically pure calcium hydroxide (Ca (OH) 2 ) Alumina (Al) 2 O 3 ) Iron oxide (Fe) 2 O 3 ) Accurately weighing according to the mass ratio of 48.10: 25.23: 25.98, and putting all materials into a ball mill for grinding until the fineness is lower than 75 mu m.
(2) And in the sintering stage, the uniformly mixed material is molded into a cylindrical cake by certain pressure, water can be added for wetting during pressing, and the cylindrical cake is put into a high-temperature furnace for sintering after being dried. The temperature of the high temperature furnace was set to be raised from normal temperature to 1350 ℃ and kept for 1 hour.
(3) And (3) quickly taking the sintered material out of the high-temperature furnace, placing the sintered material in air for quick cooling, crushing the sintered material into small particles after the sintered material is cooled to room temperature, putting the small particles into a ball mill for grinding again, and controlling the maximum particle size to be lower than 75 mu m. So far, the step C is finished through' two-grinding and one-burning 4 And (3) preparing an AF solid solution.
And (4) performance testing:
the C obtained in example 1 and example 2 was observed by a field emission scanning electron microscope 4 The microscopic morphology of the AF solid solution is shown in fig. 2. Calculated by using binarization and statistical software, example 1, C 4 The AF solid solution sphericity ratio is 75.09%, the sphericity ratio of example 2 is 91.26%, and the sphericity ratio of comparative example 1 is 5.73%. The results show that C with high sphericity can be prepared by using the radio frequency plasma system 4 AF solid solution.
The aluminate phase activities of examples 1 to 3 and comparative example 1 were also tested, the test method specifically refers to the determination method of chemical activity of light-burned magnesium oxide of ferrous metallurgy industry standard of the people's republic of China, the citric acid color development times of examples 1 to 3 and comparative example 1 were respectively 32.47s, 25.46s, 37.89s and 69.14s, and the results show that C in each example 4 The AF solid solution was significantly higher than the comparative example.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (4)

1. Preparation of spherical tetracalcium aluminoferrite C by combined gas flow crushing-radio frequency plasma technology 4 The AF solid solution process includes two main steps, including the first mixing of calcium material, aluminum material, iron material and alkali metal component in tetracalcium aluminoferrite C 4 Compounding AF solid solution with chemical dosageAnd is processed by a jet mill in advance to obtain superfine powder; then the superfine powder is treated by plasma high temperature in a radio frequency plasma system to obtain high activity spherical C 4 An AF solid solution; the jet mill is used in series with a radio frequency plasma system, in particular to the jet mill material outlet gas flow is the material carrier gas transport gas flow of the radio frequency plasma system, thus realizing the integrated series connection from the pre-milling of the material to the direct spherical sintering;
the calcareous raw material is CaO and CaCO 3 Or Ca (OH) 2 ；
The aluminum raw material is Al (OH) 3 Or gamma-Al 2 O 3 The iron raw material is Fe 2 O 3 Or Fe (OH) 3 ；
The alkali metal is Na-containing 2 O or K 2 A carbonate or sulfate of O;
the jet mill mainly comprises a draught fan, a crushing system, a cyclone separator and a dust remover, wherein the operating parameters of the crushing system are as follows: the compressed air flow is 5 to 15L/min, the installed power is 5 to 30kw, the production capacity is 10 to 150kg/h, and the discharged particle size is 2 to 75 mu m; the operation parameters of the radio frequency plasma system are as follows: the frequency is 3.5-5.0 MHz, the power is 30-200 kW, and the working gas is high-purity nitrogen or air.
2. The method of claim 1, wherein the gas stream pulverization and radio frequency plasma technology are adopted in combination to prepare the spherical C 4 The method for preparing AF solid solution is characterized in that the radio frequency plasma system mainly comprises the following parts: the device comprises a radio frequency plasma generator, a radio frequency plasma power supply, a gas and powder supply system, a reaction chamber, a collection chamber, a support, a vacuum pumping system, an electrical control and measurement system and a cold water system.
3. The method of claim 1, wherein the gas stream pulverization and radio frequency plasma technology are adopted in combination to prepare the spherical C 4 The method for preparing the AF solid solution is characterized in that the flame core temperature of a radio frequency plasma generator is 1000 to 1600 ℃.
4. Such as rightThe method for preparing spherical C by combining air flow pulverization and radio frequency plasma technology according to claim 1 4 A method of producing an AF solid solution, characterized in that the spherical C is 4 The sphericity ratio of the AF solid solution is 50% -95%.
CN202111300237.8A 2021-11-04 2021-11-04 Method for preparing spherical tetracalcium aluminoferrite solid solution by jointly adopting airflow crushing-radio frequency plasma technology Active CN113929325B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111300237.8A CN113929325B (en) 2021-11-04 2021-11-04 Method for preparing spherical tetracalcium aluminoferrite solid solution by jointly adopting airflow crushing-radio frequency plasma technology

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111300237.8A CN113929325B (en) 2021-11-04 2021-11-04 Method for preparing spherical tetracalcium aluminoferrite solid solution by jointly adopting airflow crushing-radio frequency plasma technology

Publications (2)

Publication Number Publication Date
CN113929325A CN113929325A (en) 2022-01-14
CN113929325B true CN113929325B (en) 2022-12-09

Family

ID=79285805

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202111300237.8A Active CN113929325B (en) 2021-11-04 2021-11-04 Method for preparing spherical tetracalcium aluminoferrite solid solution by jointly adopting airflow crushing-radio frequency plasma technology

Country Status (1)

Country Link
CN (1) CN113929325B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115159877B (en) * 2022-07-06 2023-05-26 西安康桥能源技术有限责任公司 Method for producing cement clinker by using electric power or natural gas as driving heat source

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103466667B (en) * 2013-09-10 2015-12-09 清华大学 A kind of using plasma high temperature pyrolytic cracking (HTP) prepares the method for nano magnesia
CN103771523B (en) * 2014-01-15 2015-01-28 北京科技大学 Method for preparing micro-fine spherical Mn3O4 powder by using MnCO3 as raw material
CN105600813B (en) * 2016-01-15 2017-07-11 武汉大学 A kind of method that utilization discharge plasma sintering technique prepares tricalcium aluminate
CN105753341B (en) * 2016-02-26 2017-08-29 西南石油大学 A kind of preparation method of calcium aluminoferrite

Also Published As

Publication number Publication date
CN113929325A (en) 2022-01-14

Similar Documents

Publication Publication Date Title
CN109437607B (en) Preparation method of high-density sintered magnesia
CN113860780B (en) Preparation method of high-activity spherical calcined coal gangue powder
CN100595154C (en) Method for extracting aluminum oxide from fly ash and coproducing cement by carbide slag or cyanamide slag
CN102626670B (en) Method for preparing high purity iron ore by reducing and magnetizing red mud in rotary kiln
WO2017016062A1 (en) Low-calcium silicate cement, and preparation method and hardening method thereof
CN113929325B (en) Method for preparing spherical tetracalcium aluminoferrite solid solution by jointly adopting airflow crushing-radio frequency plasma technology
CN101984080A (en) Process and device for separating iron and aluminum silica slag from red mud and removing alkali metal
CN103288426A (en) Method for preparing special fracturing propping agent for shale gas by utilizing industrial waste
WO2020057094A1 (en) Silicon carbide closed-cell ceramic prepared by using industrial silicon-based waste residue and preparation method therefor
CN101591150A (en) A kind of method of utilizing silico-calcium slag and carbide slag to produce silicate cement
CN113200558B (en) Production process for producing microcrystalline alpha-alumina by microwave calcination
CN108675911A (en) A kind of carbide acetylene production technology for reducing carbide slag and generating
CN109133934A (en) The method for preparing silicon carbide-based porous ceramics using oxidation silicon substrate solid waste
CN103992049B (en) Bessemer furnace slag is utilized to correct the cement clinker preparation method of irony
CN1325432C (en) Agglomeration method for synthesizing mullite by using high aluminous fly ash
CN113880463B (en) Method for producing magnesium oxide for magnesium phosphate cement by radio frequency plasma technology
CN101417867B (en) Method for preparing silicate magnesium slag concrete by using magnesium slag
Zhi et al. Effect of Al (OH) 3 particle size on microstructures and strengths of porous MgAl2O4 ceramics
CN111170749B (en) Method for preparing fused forsterite by utilizing magnesite tailings through electric melting
CN101259969B (en) Technique for preparing aluminum oxide
CN110498621B (en) Preparation method of superfine purified concentrate powder sintered magnesia
CN111439990A (en) Magnesium-aluminum-carbon gunning mix for high-titanium blast furnace slag high-temperature carbonization electric furnace and preparation method thereof
CN116874293A (en) Densification cordierite ceramic with pure phase structure and preparation method thereof
TWM580585U (en) Water purification sludge recycling treatment system
CN115504690A (en) Preparation method of activated kaolinite

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant