CN115818656A - Method for producing mullite powder by microwave heating of coal gangue - Google Patents
Method for producing mullite powder by microwave heating of coal gangue Download PDFInfo
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- CN115818656A CN115818656A CN202211410339.XA CN202211410339A CN115818656A CN 115818656 A CN115818656 A CN 115818656A CN 202211410339 A CN202211410339 A CN 202211410339A CN 115818656 A CN115818656 A CN 115818656A
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- 239000003245 coal Substances 0.000 title claims abstract description 102
- 239000000843 powder Substances 0.000 title claims abstract description 37
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 title claims abstract description 25
- 229910052863 mullite Inorganic materials 0.000 title claims abstract description 25
- 238000010438 heat treatment Methods 0.000 title claims abstract description 19
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 14
- 230000005855 radiation Effects 0.000 claims abstract description 34
- 238000000034 method Methods 0.000 claims abstract description 16
- 238000000227 grinding Methods 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 38
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 24
- 229910052799 carbon Inorganic materials 0.000 claims description 24
- 239000006148 magnetic separator Substances 0.000 claims description 20
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 18
- 239000012535 impurity Substances 0.000 claims description 15
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 12
- 239000000377 silicon dioxide Substances 0.000 claims description 9
- 235000012239 silicon dioxide Nutrition 0.000 claims description 9
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 8
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 7
- 238000007885 magnetic separation Methods 0.000 claims description 6
- 238000005265 energy consumption Methods 0.000 abstract description 10
- 239000002910 solid waste Substances 0.000 abstract description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 22
- 239000000463 material Substances 0.000 description 18
- 238000001035 drying Methods 0.000 description 13
- 239000002994 raw material Substances 0.000 description 12
- 229910052742 iron Inorganic materials 0.000 description 11
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 10
- 238000005245 sintering Methods 0.000 description 9
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 8
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 8
- AMWRITDGCCNYAT-UHFFFAOYSA-L hydroxy(oxo)manganese;manganese Chemical compound [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 description 8
- 238000011068 loading method Methods 0.000 description 8
- 238000005352 clarification Methods 0.000 description 7
- 239000004575 stone Substances 0.000 description 7
- 229910052782 aluminium Inorganic materials 0.000 description 6
- 239000007789 gas Substances 0.000 description 6
- 239000002918 waste heat Substances 0.000 description 6
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 5
- 238000000498 ball milling Methods 0.000 description 5
- 239000004566 building material Substances 0.000 description 5
- 229910000019 calcium carbonate Inorganic materials 0.000 description 5
- GBAOBIBJACZTNA-UHFFFAOYSA-L calcium sulfite Chemical compound [Ca+2].[O-]S([O-])=O GBAOBIBJACZTNA-UHFFFAOYSA-L 0.000 description 5
- 235000010261 calcium sulphite Nutrition 0.000 description 5
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 4
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 4
- 239000000292 calcium oxide Substances 0.000 description 4
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 4
- 238000010924 continuous production Methods 0.000 description 4
- 239000013078 crystal Substances 0.000 description 4
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- 239000011707 mineral Substances 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 238000003860 storage Methods 0.000 description 4
- 239000004408 titanium dioxide Substances 0.000 description 4
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 3
- 239000006096 absorbing agent Substances 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 239000004568 cement Substances 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
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- 238000006297 dehydration reaction Methods 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 229910052748 manganese Inorganic materials 0.000 description 3
- 239000011572 manganese Substances 0.000 description 3
- 238000009768 microwave sintering Methods 0.000 description 3
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- 238000000746 purification Methods 0.000 description 3
- 239000011819 refractory material Substances 0.000 description 3
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- 238000001238 wet grinding Methods 0.000 description 3
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- 239000007788 liquid Substances 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
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Abstract
The invention provides a method for producing mullite powder by microwave heating of coal gangue, belonging to the technical field of solid waste utilization, wherein the coal gangue is subjected to first microwave radiation and crushing in sequence to obtain coal gangue crushed aggregates; roasting the coal gangue crushed aggregates under the action of second microwave radiation to obtain coal gangue clinker; and sequentially grinding and magnetically separating the coal gangue clinker to obtain mullite powder. According to the invention, microwave radiation is carried out on the coal gangue before crushing, so that the internal structure of the coal gangue is damaged, the hardness of the coal gangue is reduced, the coal gangue is easy to crush, and the crushing energy consumption is reduced; the later stage roasting adopts a microwave direct heating method, so that the roasting time is shortened, the roasting energy consumption is reduced, and the obtained mullite powder has good quality.
Description
Technical Field
The invention belongs to the field of solid waste utilization, and particularly relates to a method for producing high-quality mullite powder by microwave heating of high-aluminum carbon-containing coal gangue.
Background
The coal gangue is solid waste discharged in the coal mining process and the coal washing process, and is a black and gray rock which has lower carbon content and is harder than coal and is associated with a coal bed in the coal forming process. Most of coal gangue contains Al as main component 2 O 3 、SiO 2 And in addition, fe in different quantities 2 O 3 The carbon content is generally between 16 and 25% and the hardness is between 4.0 and 6.0.
China is a big coal producing country, particularly in places such as Shanxi Yunnan inner Mongolia Sichuan, the high-aluminum carbon-containing coal gangue has extremely rich yield, particularly, the coal gangue in places such as Shanxi Zuoyun, yangquan, inner Mongolia has extremely high aluminum content, and the main components are aluminum trioxide, silicon dioxide, carbon and ferric trioxide.
High-alumina coal gangue is one of the commonly used raw materials for producing mullite, but the traditional heating and firing period is long and the energy consumption is extremely high, the existing treatment method for producing building materials by using the high-alumina coal gangue is crushing, roasting, fine grinding and filter pressing of raw stone, and the coal gangue has high hardness and high crushing cost, so that the coal gangue almost accounts for half of the treatment cost in the early stage of roasting. The high-alumina coal gangue is extremely high in roasting energy consumption and long in roasting time, generally needs more than 6 hours for roasting, is extremely high in roasting energy consumption, and often has a phenomenon of half-cooked product, so that the product performance is unstable, and the energy consumption cost is high. The general industry crushes the high-alumina coal gangue to 3cm grain diameter, which consumes 15 kW.h/T and 1240 kW.h/T of roasting power. Most enterprises cannot run production, and large-area production stoppage occurs. Therefore, the invention is very important to invent a method for reducing the crushing difficulty and accelerating the roasting time.
Disclosure of Invention
The invention aims to provide a method for producing mullite powder by microwave heating of coal gangue, wherein the interface stress of the coal gangue is changed by microwave radiation before crushing, the hardness of the coal gangue is reduced, the coal gangue is easy to crush, the roasting time is shortened by direct microwave heating in later roasting, the energy consumption is reduced, the product quality is uniform, the environmental protection effect is good, the production cost is low, and the method is suitable for industrial production.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides a method for producing mullite powder by microwave heating of coal gangue, which comprises the following steps:
sequentially carrying out first microwave radiation and crushing on the coal gangue to obtain coal gangue crushed aggregates;
roasting the coal gangue crushed aggregates under the action of second microwave radiation to obtain coal gangue clinker;
sequentially grinding and magnetically separating the coal gangue clinker to obtain mullite powder;
the coal gangue comprises the following main components in percentage by weight: 30 to 50 percent of aluminum oxide, 35 to 45 percent of silicon dioxide, 0.1 to 0.3 percent of ferric oxide and 16 to 25 percent of carbon.
Preferably, the first microwave radiation time is 2-5min, the frequency is 2.45GHz, and the total input power is 10-20kW.
Preferably, the crushing is performed by coarse crushing and then fine crushing.
Preferably, the diameter of the coarsely crushed coal gangue block is 6-12cm; the diameter of the coal gangue blocks after fine crushing is 1-4cm.
Preferably, the roasting temperature is 1050-1200 ℃, and the roasting time is 1-2h; the frequency of the second microwave radiation is 2.45GHz, and the total input power is 20-40kW.
Preferably, the mill output particle size is-400 mesh, with-500 mesh accounting for 95%.
Preferably, the magnetic separation comprises the step of sequentially driving the ground coal gangue into a semi-countercurrent magnetic separator and a high-gradient magnetic separator for magnetic separation.
Preferably, the magnetic field intensity of the semi-countercurrent magnetic separator is 200-400 MT; the magnetic field intensity of the high-gradient magnetic separator is 700-900 MT.
Preferably, the ratio of aluminum to silicon of the mullite powder is 0.8-1: 1, the water content is 1-2%, and other impurities are 0.1-0.25%.
The invention has the beneficial technical effects that:
the invention provides a method for producing mullite powder by microwave heating of coal gangue, which comprises the steps of sequentially carrying out first microwave radiation and crushing on the coal gangue to obtain coal gangue crushed aggregates; performing microwave high-temperature roasting on the coal gangue crushed aggregates under the action of second microwave radiation to obtain coal gangue clinker; and sequentially grinding and magnetically separating the coal gangue clinker to remove impurities to obtain mullite powder. According to the invention, microwave radiation is carried out on the coal gangue before crushing, so that the internal structure of the coal gangue is damaged, the hardness of the coal gangue is reduced, the coal gangue is easy to crush, and the crushing energy consumption is reduced; the method of microwave direct heating is adopted in the later stage roasting, so that the roasting time is shortened, and the roasting energy consumption is reduced; carbon, iron oxide and the like in the coal gangue are good microwave absorbers, and the coal gangue violently moves to generate heat energy, so that the heating of materials is carried out simultaneously inside and outside, compared with the traditional heating, the phenomenon of material intergrowth cannot occur, the decomposition and combustion of the carbon are more thorough, the phenomenon of clinker black core cannot occur, the required temperature is 130 ℃ lower than that of the traditional heating, the sintering whiteness is 94%, the ratio of aluminum to silicon is 0.8-1, and the yield is more than 80%.
Drawings
FIG. 1 is a process flow chart of the production of mullite powder by microwave and coal gangue.
Detailed Description
The invention provides a method for producing mullite powder by microwave heating of coal gangue, which comprises the following steps:
sequentially carrying out first microwave radiation and crushing on the coal gangue to obtain coal gangue crushed aggregates;
roasting the coal gangue crushed aggregates under the action of second microwave radiation to obtain coal gangue clinker;
sequentially grinding and magnetically separating the coal gangue clinker to obtain mullite powder;
the coal gangue comprises the following main components in percentage by weight: 30 to 50 percent of aluminum oxide, 35 to 45 percent of silicon dioxide, 0.1 to 0.3 percent of ferric oxide and 16 to 25 percent of carbon.
The coal gangue is sequentially subjected to first microwave radiation and crushing to obtain coal gangue crushed aggregates.
In the invention, the coal gangue comprises the following main components in percentage by weight: 30 to 50 percent of aluminum oxide, 35 to 45 percent of silicon dioxide, 0.1 to 0.3 percent of ferric oxide and 16 to 25 percent of carbon; more preferably 35 to 45 percent of aluminum oxide, 38 to 42 percent of silicon dioxide, 0.15 to 0.25 percent of ferric oxide, 16 percent of carbon content, 0.2 to 0.3 percent of titanium dioxide, 2 to 3 percent of crystal water, 0.05 to 0.08 percent of calcium oxide, 0.2 to 0.5 percent of manganese oxide, 0.1 to 0.25 percent of the total of the rest and 2.45 g/cubic centimeter of specific gravity; the hardness of the coal gangue is preferably 4.0-6.0, and more preferably 4.5-5.5.
In the present invention, the time of the first microwave irradiation is preferably 2 to 5min, more preferably 3min; the frequency of the first microwave radiation is preferably 2.45GHz and the total power input of the first microwave radiation is preferably 10-20kW, more preferably 13-17 kW, most preferably 15kW. The first irradiation according to the invention is preferably carried out in a multimode microwave irradiation oven.
In the invention, the coal gangue has poor thermal conductivity and small thermal conductivity of various mineral components, the components have different microwave absorption capacities, the temperature gradient of the coal gangue is increased under the action of microwave radiation, so that the thermal stress is increased, and on the other hand, the liquid in the pores of the coal gangue is partially vaporized under the action of microwave radiation to generate high saturated vapor pressure. Therefore, the local thermal stress and the saturated vapor pressure of the liquid in the coal gangue exceed the tensile strength of the coal gangue through the first microwave radiation, so that the coal gangue is cracked to form cracks, the generation of the cracks can effectively promote the monomer dissociation for absorbing the microwave minerals and increase the effective reaction area for absorbing the microwave minerals, the crushing time of the coal gangue can be reduced, the strength of the coal gangue can be reduced, and the crushing cost can be reduced. The test result shows that the power consumption of the coal gangue raw ore which is not subjected to microwave irradiation is more than one time when the coal gangue raw ore is crushed to 2-3cm than after being subjected to microwave irradiation for 3 minutes, and the yield is reduced by half.
In the invention, the crushing is preferably performed by coarse crushing and then fine crushing; the block diameter of the coarsely crushed coal gangue is preferably 6-12cm, and more preferably 8-10cm; the coarse crushing is preferably performed using a jaw crusher. In the invention, the block diameter of the coal gangue after fine crushing is preferably 1-4cm, and more preferably 3cm; the fine crushing is preferably performed by a vertical hammer crusher.
After the coal gangue crushed aggregates are obtained, the coal gangue crushed aggregates are roasted under the action of second microwave radiation to obtain coal gangue clinker.
In the invention, the roasting temperature is preferably 1050-1200 ℃, more preferably 1100-1150 ℃, and the time is 1-2h, more preferably 1.5h; the frequency of the second microwave radiation is preferably 2.45GHz, and the total power input is preferably 20-40kW, and more preferably 25-30 kW.
In the invention, the coal gangue crushed aggregates are preferably conveyed to a storage bin through a threaded belt conveying device and are loaded into a special loading box for microwave high temperature through a feeder, and the specification of the loading box is as follows: length, width, height =2.5m 1.3 x 0.5m.
In the invention, the special charging box for the high temperature microwave is sent into a continuous production multi-mode microwave box-type kiln for high temperature roasting through a pusher, and the length, the width and the height of the multi-mode microwave box-type kiln are 20M in the kiln and 1.5M in the kiln and 1.2M in the kiln.
In the invention, the microwave is used for sintering the high-aluminum carbon-containing coal gangue raw material, and the process can be completed in a short time, thereby reducing a large amount of energy consumption. Carbon, iron oxide and the like in the coal gangue are good microwave absorbers, and heat energy is generated by the violent movement of the coal gangue, so that the heating of the materials is carried out inside and outside simultaneously, and compared with the traditional heating, the phenomenon of material half-cooked cannot occur, the decomposition and combustion of the carbon are thorough, and the phenomenon of clinker black core cannot occur. The experimental result shows that the required temperature is 130 ℃ lower than that of the traditional heating, the sintering whiteness is 94 percent, the aluminum-silicon ratio is 0.8-1, and the yield is more than 80 percent.
After obtaining the coal gangue clinker, sequentially grinding and magnetically separating the coal gangue clinker to remove impurities, thereby obtaining the mullite powder.
In the invention, the grinding mode is preferably ball milling, and more preferably water-added ball milling; the water addition amount is preferably 1-2 times of that of coal gangue clinker, and more preferably 1.5 times; the grinding time is preferably 10-20min, and more preferably 15min; the ground discharge particle size is preferably-400 meshes, more preferably-500 meshes accounting for 95 percent
In the invention, the magnetic separation is preferably carried out by adding the ground material into a semi-countercurrent magnetic separator and then adding the material into a high-gradient magnetic separator for magnetic separation; the magnetic field intensity of the semi-countercurrent magnetic separator is preferably 200-400 MT, more preferably 300MT; the magnetic field intensity of the high-gradient magnetic separator is preferably 700-900 MT, and more preferably 800MT. The invention removes strong magnetic iron by a semi-countercurrent magnetic separator, and the ore pulp after iron removal flows into a high-gradient magnetic separator to remove other weak magnetic minerals.
After the impurity-removed ore pulp is obtained, the invention dehydrates and dries the impurity-removed ore pulp to obtain the mullite powder.
In the present invention, the dehydrated water content is preferably 12 to 14%, more preferably 13%, and the dried water content is preferably 1 to 2%, more preferably 1.5%; the drying mode is preferably waste heat and microwave drying.
In the present invention, the mullite powder preferably has an aluminum-silicon ratio of 0.8 to 1:1; more preferably 0.85:1, most preferably 0.86:1.
the invention carries out environment-friendly treatment on the tail water and the tail gas.
In the invention, the tail water treatment mode is preferably pool clarification, and the clarified tail water is used as water for size mixing; and the tail gas treatment mode is preferably dust removal treatment, then the tail gas is introduced into a lime water pool to form calcium carbonate, calcium sulfite and the like, and the calcium carbonate, the calcium sulfite and the like are fished out and dried to be used as building material raw materials.
In the invention, the powder is dried by using microwave and waste heat drying equipment, so that the waste heat is utilized, and the characteristic that water is a good microwave absorber is also utilized, so that the drying speed is extremely high.
Example 1
1) Selecting 1 ton of Shanxi Daganyun left-cloud high-alumina carbon-containing coal gangue (ferric oxide 0.11%, aluminum oxide 37.66%, silicon dioxide 42.98%, titanium dioxide 0.3%, carbon content 16%, crystal water 2.5%, calcium oxide 0.06%, manganese oxide 0.3%, other total amount 0.1%, specific gravity 2.45 g/cubic centimeter), transporting 1 ton of stone raw material to a multimode microwave radiation furnace by using feeding equipment to perform first microwave radiation, performing microwave radiation for 3 minutes, wherein the microwave frequency is 2.45GHz, the total power is 15KW, then conveying the stone raw material to a frontal crusher by using discharging equipment to perform coarse crushing, the block diameter after crushing is 9CM, then conveying the material to a vertical hammer to perform fine crushing, and the particle size after crushing is 3CM;
2) Conveying the fine broken materials to a storage bin through a threaded belt conveying device, and loading the fine broken materials into a special microwave high-temperature loading box with specifications through a feeder; length, width, height =2.5m, 1.3, 0.5m;
feeding the special microwave high-temperature charging box into a continuous production multi-mode microwave box-type kiln (length, width and height; 20M in a furnace 1.5M 1.2M) through a pusher for high-temperature roasting, wherein the temperature is 1100 ℃, the constant temperature time is 1.5 hours, the microwave frequency is 2.45GHz, the input total power is 30KW, and clinker is sintered;
3) After cooling the clinker, sending the clinker to a lattice ball mill through a feeder, adding water for wet milling, wherein the water addition amount is 1.5 times of the mass of the clinker, the ball milling time is 15 minutes, and the discharged material has a granularity of 400 meshes, wherein the 500 meshes account for 95%;
pumping the ore pulp into a 300MT magnetic field intensity semi-countercurrent magnetic separator to remove strong magnetic iron, enabling the ore pulp after iron removal to flow into a high gradient magnetic separator, adjusting the magnetic field intensity to be 800MT, and removing impurities to obtain impurity-removed ore pulp;
the impurity-removed ore pulp flows into a thickening tank and enters a ceramic filter for dehydration to obtain powder, the water content is 13 percent, and the yield is 80.7 percent; conveying the water-containing powder to a drying device through a belt, drying through sintering waste heat and microwaves, and bagging the dried powder;
4) Tail water enters a clarification water tank, is used as water for size mixing after clarification, is recycled, and a very small amount of tail water enters a dust removal device for tail gas purification treatment, is introduced into a lime water tank through a fan to form calcium carbonate, calcium sulfite and the like, is fished out for drying, and is sold to a cement plant or a stirring station to be used as building material raw materials.
The powder is sampled and sent to Shandong mullite refractory material manufacturers for identification, and the identification result shows that the powder has excellent dispersion performance, less impurity content, high refractoriness, 95 percent of sintering whiteness, better mechanical strength, thermal stability and chemical stability, 0.86 percent of aluminum-silicon ratio and 0.1 percent of other impurities (carbon, iron and manganese).
The statistics show that the power consumption in the microwave crushing stage is 3.25 kW.h, and the power consumption in the microwave sintering stage is 45 kW.h.
Example 2
1) 1 ton of high-alumina coal gangue (ferric oxide 0.23%, aluminum oxide 42.36%, silicon dioxide 38%, titanium dioxide 0.25%, carbon content 20%, crystal water 2%, calcium oxide 0.05%, manganese oxide 0.4%, the total content of the rest 0.15%, and specific gravity 2.53 g/cubic centimeter) containing carbon is selected from Shanxi Daqin left cloud, 1 ton of stone raw material is conveyed to a multimode microwave radiation furnace by feeding equipment to carry out first microwave radiation, the microwave radiation is carried out for 2 minutes, the microwave frequency is 2.45GHz, the total power is 10KW, then the stone raw material is conveyed to a forehead type crusher by discharging equipment to carry out coarse crushing, the block diameter after crushing is 6CM, then the material is conveyed to a vertical hammer crusher to carry out fine crushing, and the particle size after crushing is 1CM;
2) Conveying the fine broken materials to a storage bin through a threaded belt conveying device, and loading the fine broken materials into a special microwave high-temperature loading box with specifications through a feeder; length, width, height =2.5m 1.3 x 0.5m;
feeding the special microwave high-temperature charging box into a continuous production multi-mode microwave box-type kiln (length, width and height; 20M in a furnace 1.5M 1.2M) through a pusher for high-temperature roasting, wherein the temperature is 1050 ℃, the constant-temperature time is 1 hour, the microwave frequency is 2.45GHz, the input total power is 20KW, and the clinker is roasted;
3) After cooling the clinker, sending the clinker to a lattice ball mill through a feeder, adding water for wet milling, wherein the water addition amount is 1 time of the mass of the clinker, the ball milling time is 10 minutes, and the discharged material has a granularity of 400 meshes, wherein the 80% of the 500 meshes;
pumping the ore pulp into a magnetic field intensity 200MT semi-countercurrent magnetic separator to remove strong magnetic iron, enabling the ore pulp after iron removal to flow into a high gradient magnetic separator, adjusting the magnetic field intensity to 700MT, and removing impurities to obtain impurity-removed ore pulp;
the impurity-removed ore pulp flows into a thickening tank and enters a ceramic filter for dehydration to obtain powder, the water content is 12 percent, and the yield is 77.6 percent; conveying the water-containing powder to a drying device through a belt, drying through sintering waste heat and microwaves, and bagging the dried powder;
4) Tail water enters a clarification water tank, is used as water for size mixing after clarification, is recycled, and a very small amount of tail water enters a dust removal device for tail gas purification treatment, is introduced into a lime water tank through a fan to form calcium carbonate, calcium sulfite and the like, is fished out for drying, and is sold to a cement plant or a stirring station to be used as building material raw materials.
The powder is sampled and sent to Shandong mullite refractory material manufacturers for identification, and the identification result shows that the powder has excellent dispersion performance, less impurity content, high refractoriness, 91 percent of sintering whiteness, better mechanical strength, thermal stability and chemical stability, 0.81 of aluminum-silicon ratio and 0.15 percent of other impurities (carbon, iron and manganese).
Through statistics, the power consumption in the microwave crushing stage is 2.8 kW.h, and the power consumption in the microwave sintering stage is 20 kW.h.
Example 3
1) Selecting 1 ton of Shanxi Dayun left-side high-alumina carbon-containing coal gangue (0.3 percent of ferric oxide, 50 percent of aluminum oxide, 45 percent of silicon dioxide, 0.3 percent of titanium dioxide, 25 percent of carbon content, 3 percent of crystal water, 0.08 percent of calcium oxide, 0.5 percent of manganese oxide, 0.25 percent of other total amount and 2.57 g/cubic centimeter), conveying 1 ton of stone raw material to a multimode microwave radiation furnace by using feeding equipment to perform first microwave radiation, performing microwave radiation for 5 minutes, wherein the microwave frequency is 915MHz, the total power is 20KW, then conveying the stone raw material to a frontal crusher by using discharging equipment to perform coarse crushing, the block diameter after crushing is 12CM, then conveying the material to a vertical hammer to perform fine crushing, and the crushed particle size is 4CM;
2) Conveying the fine broken materials to a storage bin through a threaded belt conveying device, and loading the fine broken materials into a special microwave high-temperature loading box with specifications through a feeder; length, width, height =2.5m 1.3 x 0.5m;
feeding the special microwave high-temperature charging box into a continuous production multi-mode microwave box-type kiln (length, width and height; 20M in a furnace 1.5M in 1.2M) through a pusher for high-temperature roasting, wherein the temperature is 1200 ℃, the constant temperature time is 2 hours, the microwave frequency is 915MHz, the input total power is 40KW, and the clinker is roasted;
3) Cooling the clinker, conveying the clinker to a lattice ball mill through a feeder, adding water for wet milling, wherein the water addition amount is 2 times of the mass of the clinker, the ball milling time is 20 minutes, and the discharged material has a particle size of 400 meshes, wherein 90 percent of-600 meshes;
pumping the ore pulp into a magnetic field intensity 400MT semi-countercurrent magnetic separator to remove strong magnetic iron, enabling the ore pulp after iron removal to flow into a high gradient magnetic separator, adjusting the magnetic field intensity to 900MT, and removing impurities to obtain impurity-removed ore pulp;
the ore pulp after impurity removal flows into a thickening tank and enters a ceramic filter for dehydration to obtain powder with the water content of 14 percent and the yield of 79.9 percent; conveying the water-containing powder to a drying device through a belt, drying through sintering waste heat and microwaves, and bagging the dried powder;
4) Tail water enters a clarification water tank, is used as water for size mixing after clarification, is recycled, and a very small amount of tail water enters a dust removal device for tail gas purification treatment, is introduced into a lime water tank through a fan to form calcium carbonate, calcium sulfite and the like, is fished out for drying, and is sold to a cement plant or a stirring station to be used as building material raw materials.
The powder is sampled and sent to Shandong mullite refractory material manufacturers for identification, and the identification result shows that the powder has excellent dispersion performance, less impurity content, high refractoriness, 89 percent of sintering whiteness, better mechanical strength, thermal stability and chemical stability, 0.84 percent of aluminum-silicon ratio and 0.25 percent of other impurities (carbon, iron and manganese).
Through statistics, the power consumption in the microwave crushing stage is 4.1 kW.h, and the power consumption in the microwave sintering stage is 80 kW.h.
Claims (9)
1. A method for producing mullite powder by microwave heating of coal gangue is characterized by comprising the following steps:
sequentially carrying out first microwave radiation and crushing on the coal gangue to obtain coal gangue crushed aggregates;
roasting the coal gangue crushed aggregates under the action of second microwave radiation to obtain coal gangue clinker;
sequentially grinding and magnetically separating the coal gangue clinker to obtain mullite powder;
the coal gangue comprises the following main components in percentage by weight: 30 to 50 percent of aluminum oxide, 35 to 45 percent of silicon dioxide, 0.1 to 0.3 percent of ferric oxide and 16 to 25 percent of carbon.
2. The method according to claim 1, wherein the first microwave radiation is for a time of 2-5min, has a frequency of 2.45GHz and has a total power input of 10-20kW.
3. The method of claim 1, wherein the breaking is coarse and then fine.
4. The method according to claim 3, wherein the diameter of the coarsely crushed coal gangue is 6-12cm; the diameter of the coal gangue blocks after fine crushing is 1-4cm.
5. The method according to claim 1, characterized in that the roasting temperature is 1050-1200 ℃ and the time is 1-2h; the frequency of the second microwave radiation is 2.45GHz, and the total input power is 20-40kW.
6. The method of claim 1, wherein the mill output particle size is-400 mesh.
7. The method of claim 1, wherein the magnetic separation comprises sequentially feeding the ground coal gangue clinker into a semi-countercurrent magnetic separator and a high gradient magnetic separator for magnetic separation and impurity removal.
8. The method of claim 7, wherein the magnetic field strength of the semi-countercurrent magnetic separator is 200-400 MT; the magnetic field intensity of the high-gradient magnetic separator is 700-900 MT.
9. The method according to any one of claims 1 to 8, wherein the mullite powder has an Al/Si ratio of 0.8 to 1:1, the water content is 1-2%, and other impurities are 0.1-0.25%.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102351446A (en) * | 2011-07-20 | 2012-02-15 | 盐城工学院 | Preparation method of gangue active mixed material |
| CN111018488A (en) * | 2019-12-06 | 2020-04-17 | 山西超牌煅烧高岭土有限公司 | Production method of microcrystalline mullite calcined kaolin, obtained product and application |
| CN112588282A (en) * | 2020-12-23 | 2021-04-02 | 山西晋坤矿产品股份有限公司 | Method for preparing binary composite catalytic cracking molecular sieve precursor from coal gangue |
| WO2022144014A1 (en) * | 2020-12-31 | 2022-07-07 | 郑州轻工业大学 | Mullite-based micro-nano-porous heat insulating refractory material and preparation method therefor |
| CN115057439A (en) * | 2022-07-05 | 2022-09-16 | 淮北师范大学 | Environment-friendly calcination-free coal gangue activation method |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102351446A (en) * | 2011-07-20 | 2012-02-15 | 盐城工学院 | Preparation method of gangue active mixed material |
| CN111018488A (en) * | 2019-12-06 | 2020-04-17 | 山西超牌煅烧高岭土有限公司 | Production method of microcrystalline mullite calcined kaolin, obtained product and application |
| CN112588282A (en) * | 2020-12-23 | 2021-04-02 | 山西晋坤矿产品股份有限公司 | Method for preparing binary composite catalytic cracking molecular sieve precursor from coal gangue |
| WO2022144014A1 (en) * | 2020-12-31 | 2022-07-07 | 郑州轻工业大学 | Mullite-based micro-nano-porous heat insulating refractory material and preparation method therefor |
| CN115057439A (en) * | 2022-07-05 | 2022-09-16 | 淮北师范大学 | Environment-friendly calcination-free coal gangue activation method |
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