CN108395123B - High-activity 99-grade calcium oxide electric burning kiln and burning method - Google Patents
High-activity 99-grade calcium oxide electric burning kiln and burning method Download PDFInfo
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- CN108395123B CN108395123B CN201810408004.1A CN201810408004A CN108395123B CN 108395123 B CN108395123 B CN 108395123B CN 201810408004 A CN201810408004 A CN 201810408004A CN 108395123 B CN108395123 B CN 108395123B
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- 239000000292 calcium oxide Substances 0.000 title claims abstract description 87
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 title claims abstract description 87
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 title claims abstract description 85
- 230000000694 effects Effects 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 29
- 229910021532 Calcite Inorganic materials 0.000 claims abstract description 112
- 238000010438 heat treatment Methods 0.000 claims abstract description 50
- 238000001354 calcination Methods 0.000 claims abstract description 39
- 238000000465 moulding Methods 0.000 claims description 36
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 32
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 21
- 229910052760 oxygen Inorganic materials 0.000 claims description 21
- 239000001301 oxygen Substances 0.000 claims description 21
- 230000005674 electromagnetic induction Effects 0.000 claims description 19
- 229910052751 metal Inorganic materials 0.000 claims description 19
- 239000002184 metal Substances 0.000 claims description 19
- 230000001681 protective effect Effects 0.000 claims description 19
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 16
- 239000001569 carbon dioxide Substances 0.000 claims description 15
- 239000002245 particle Substances 0.000 claims description 15
- 239000000919 ceramic Substances 0.000 claims description 13
- 238000009413 insulation Methods 0.000 claims description 12
- 238000009423 ventilation Methods 0.000 claims description 11
- 230000006698 induction Effects 0.000 claims description 10
- 238000007599 discharging Methods 0.000 claims description 9
- 238000003837 high-temperature calcination Methods 0.000 claims description 7
- 238000004806 packaging method and process Methods 0.000 claims description 7
- 238000004321 preservation Methods 0.000 claims description 7
- 238000005485 electric heating Methods 0.000 claims description 5
- 238000003825 pressing Methods 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000000748 compression moulding Methods 0.000 claims description 3
- 238000000227 grinding Methods 0.000 claims description 3
- 238000012216 screening Methods 0.000 claims description 3
- 235000012255 calcium oxide Nutrition 0.000 claims 14
- 230000007547 defect Effects 0.000 abstract description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 10
- 238000010521 absorption reaction Methods 0.000 description 7
- 238000007493 shaping process Methods 0.000 description 7
- 239000007789 gas Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 229910000019 calcium carbonate Inorganic materials 0.000 description 5
- 238000004590 computer program Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000003801 milling Methods 0.000 description 4
- 235000004237 Crocus Nutrition 0.000 description 3
- 241000596148 Crocus Species 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 238000005262 decarbonization Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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- 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
- C04B2/00—Lime, magnesia or dolomite
- C04B2/10—Preheating, burning calcining or cooling
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/02—Oxides or hydroxides
- C01F11/04—Oxides or hydroxides by thermal decomposition
- C01F11/06—Oxides or hydroxides by thermal decomposition of carbonates
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/60—Optical properties, e.g. expressed in CIELAB-values
- C01P2006/65—Chroma (C*)
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
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- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Materials Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
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Abstract
The invention discloses a high-activity 99-grade calcium oxide electric burning kiln and a calcining method, aiming at solving the defects that the calcium oxide calcining cannot achieve high-purity and high-activity double high quality and the calcium oxide product cannot meet the high-end requirement required in the market. The device comprises a kiln body and a kiln car movably arranged in the kiln body, calcite forming blocks are stacked on the kiln car, a kiln door is arranged on the kiln body, heating wires are arranged on the inner wall of the kiln body and the inner surface of the kiln door, an air inlet hole is formed in the kiln car, one end of the air inlet hole is communicated with the inner cavity of the kiln body, the other end of the air inlet hole is connected with an air inlet mechanism, a temperature detector and a pressure detector are arranged in the inner cavity of the kiln body, the air inlet mechanism comprises an air storage tank, a solenoid valve, a flow detector and a controller, an air inlet pipe is arranged between the air storage tank and the air inlet hole, the solenoid valve and the flow detector are arranged on the air inlet pipe, and the heating wires, the temperature detector, the pressure detector, the solenoid valve and the flow detector are all electrically connected to the controller.
Description
Technical Field
The invention relates to a calcium oxide calcining technology, in particular to a high-activity 99-grade calcium oxide electric burning kiln and a calcining method.
Background
China is a big country for producing calcium oxide, but the field of high-purity and high-activity calcium oxide cannot meet the high-end standard requirement due to the backward process. The disadvantages of the traditional production process are as follows: the high-activity products mostly adopt ultra-high temperature short calcination time, although the activity is improved, the content of calcium oxide is obviously reduced; high-purity calcium oxide is calcined at high temperature for a long time, the purity is improved, but the activity is obviously reduced. The traditional production process can not obtain double-height products and can not meet the high-end requirement required in the market.
Disclosure of Invention
The invention overcomes the defects that the calcination of the calcium oxide can not reach high-purity and high-activity dual-high quality and the calcium oxide product can not reach the high-end requirement required in the market, and provides the high-activity 99-grade calcium oxide electric burning kiln and the calcination method.
In order to solve the technical problems, the invention adopts the following technical scheme: the utility model provides a high activity 99 level calcium oxide electric kiln, including the kiln body, the activity sets up the kiln car in the kiln body, pile up the calcite shaping piece that forms by broken calcite compression molding on the kiln car, be equipped with the kiln door on the kiln body, all install the heating wire on the kiln internal wall and on the kiln door internal surface, be equipped with the inlet port on the kiln car, inlet port one end and kiln body inner chamber intercommunication, the mechanism of admitting air is connected to the inlet port other end, thermodetector is installed to kiln body inner chamber, thermodetector, pressure detector, the mechanism of admitting air includes the gas holder, the solenoid valve, flow detector, the controller, install the intake pipe between gas holder and the inlet port, the solenoid valve, flow detector all installs in the intake pipe, the heating wire, thermodetector, pressure detector, the solenoid valve, flow detector all electricity is connected on the controller, kiln body upper end is equipped with the gas outlet.
During calcium oxide production, high-quality calcite is firstly crushed, then the calcite is pressed into calcite forming blocks with brick-shaped structures, and the calcite forming blocks are stacked on a kiln car, so that a sufficient ventilation gap is reserved between every two adjacent calcite forming blocks. And then pushing the kiln car into the kiln body, closing the kiln door, and starting the electric kiln to calcine the calcite molding blocks. In the calcining process, oxygen is introduced into the kiln body through the air inlet hole to remove carbon dioxide, so that the separated carbon dioxide can be rapidly discharged, and the high purity of the calcium oxide product is favorably ensured. The controller controls the heating power of the heating wire according to the temperature in the kiln body detected by the temperature detector, so that the temperature in the kiln body can be accurately controlled. The controller controls the flow of the oxygen introduced into the kiln body through the pressure in the kiln body detected by the pressure detector, feeds the actual oxygen flow detected by the flow detector back to the controller, and controls the opening of the electromagnetic valve according to the fed-back oxygen flow information. The controller can be arranged in a computer program control system, the oxygen flow and the temperature and pressure in the kiln body are controlled by the computer program control system, and a fireman can master the furnace condition and adjust the furnace condition according to the detection data, thereby simplifying the operation and reducing the labor intensity. The calcium oxide produced by the electric burning kiln with the structure can reach high quality with high purity and high activity, and the calcium oxide product can meet the high-end requirement required in the market.
Preferably, the kiln car is provided with a heat insulation base in a lifting way, and the air inlet is arranged on the heat insulation base. The heat insulation base is reciprocated up and down in a certain range in the calcining process of the calcite forming block, so that the uniform heating calcining of each position of the calcite forming block is facilitated, the phenomena of green burning and overburning are avoided, and the quality of calcium oxide is ensured.
Preferably, a plurality of supporting tubes are mounted on the upper surface of the kiln car, the lower ends of the supporting tubes are communicated with the air inlet holes, a plurality of layers of trays are arranged above the kiln car at intervals, the trays are sleeved on the supporting tubes, limiting flanges which are turned upwards are arranged at the edges of the trays, a plurality of air vents are arranged in the trays and are communicated with the supporting tubes, a plurality of air outlet holes are arranged on the upper surface of each tray and correspond to each air vent, and the air outlet holes are communicated with the air vents.
Calcite forming blocks are stacked on the tray for calcination, and the ventilation gap between the Calcite forming blocks is large. When carrying out logical oxygen decarbonization, oxygen passes through the inlet port inflow stay tube to through the air vent outflow on the air vent follow tray, let in between the calcite shaping piece, the ventilation effect is good, is favorable to the thorough discharge of carbon dioxide, ensures the high purity of product. When the calcination is accomplished and is unloaded, only need take off the tray from the stay tube layer upon layer, with the calcium oxide on the tray pour into the milling machine and carry out the crocus can, it is convenient to unload. The limiting flanging plays a good role in protecting the calcite forming block, and the phenomenon of toppling is prevented.
Preferably, an inductance coil is installed in the side wall of the kiln body, the upper end and the lower end of the inductance coil are respectively close to the upper end and the lower end of the kiln body, a heating body is arranged in the calcite forming block and comprises an electromagnetic induction metal core and protective ceramic, and the electromagnetic induction metal core is sealed in the protective ceramic.
When the electric burning furnace kiln heats and calcines the calcite molding block through the electric heating wire, the induction coil is electrified to carry out electromagnetic heating on the electromagnetic induction metal core in the calcite molding block, so that the calcite molding block is heated by outwards inwards and inwards at the same time, the internal and external heat absorption balance of the calcite molding block is ensured, the phenomena of local burning and overburning are avoided, and the quality of a calcium oxide product is effectively improved.
Preferably, the outer wall of the inductance coil is sleeved with a protective sleeve. The protective sleeve plays a good role in heat insulation protection for the inductance coil.
Preferably, one part of the induction coil is arranged in the kiln body, the other part of the induction coil is arranged in the kiln door, and the two parts of the induction coils are inserted and conducted. This structural arrangement facilitates the mounting arrangement of the inductor coils.
A calcium oxide calcining method using a high-activity 99-grade calcium oxide electric kiln,
firstly, selecting calcite as a raw material, cleaning and draining;
secondly, crushing calcite, and screening calcite particles with the particle size close to that of the calcite particles for later use;
thirdly, pressing calcite particles into cuboid calcite forming blocks, and then dehydrating and drying;
fourthly, stacking the dehydrated and dried calcite forming blocks on a kiln car, pushing the kiln car into the kiln body, and covering a kiln door;
fifthly, calcining the calcite molding block by an electric burning furnace kiln, heating for 20-30 hours through a medium-temperature heating and heat absorbing stage at 500-850 ℃ to enable the calcite molding block to reach 850 ℃ from outside to inside; then heating for 10-15 hours in a high-temperature calcination stage at 850-1150 ℃, wherein the heating rate is controlled at 15-20 ℃ per hour; then carrying out a temperature balancing and preserving stage at 1150 ℃ for 25-35 hours; introducing oxygen into the kiln body to remove carbon dioxide in the high-temperature calcination stage and the constant-temperature and heat-preservation stage;
and sixthly, discharging the calcium oxide out of the kiln after the temperature in the kiln body is reduced to 580 ℃, immediately performing grinding operation in a fully-closed workshop after discharging the calcium oxide out of the kiln, quickly putting the calcium oxide into a bag for packaging, and controlling the time from discharging the calcium oxide out of the kiln to finishing packaging within one hour.
Because the separation of carbon dioxide in the calcium carbonate calcination process is slowly carried out from the surface to the inside of calcium carbonate, the calcium carbonate with large particle size is more difficult to calcine than the calcium carbonate with small particle size, and the calcium carbonate with uneven size is more difficult to calcine together, so that the calcite is crushed, the calcite is not easy to crack after being crushed, and then calcite particles with similar particle size are screened out and pressed into cuboid calcite forming blocks for calcination, which is of great importance for ensuring the quality of products. The electric burning furnace is adopted for heating and calcining, so that the calcite molding block can be uniformly heated in all gaps, no dead angle exists, and quick combustion and quick cooling can be realized due to the fact that electric burning flames are uniform and release heat simultaneously. The calcium oxide does not contain ash and impurities after being calcined, so that the obtained calcium oxide has good activity, high purity and less impurities. And (3) dehydrating and drying before calcining the calcite forming block to remove volatile substances. The calcining process of the calcite forming block comprises a medium-temperature heating and heat absorbing stage, a high-temperature calcining stage, a constant temperature stage and a heat preservation stage, wherein the temperature rise speed in the high-temperature calcining stage is controlled to be 15-20 ℃ per hour, if the temperature rise speed is too high, namely the external heating temperature is too high, the surface overburning phenomenon is easily caused, the high activity acquisition is directly influenced, the CO2 separation is difficult due to too low heating temperature, and the content of the effective calcium oxide is reduced. Oxygen is introduced into the kiln body to remove carbon dioxide in the high-temperature calcination stage and the constant-temperature and heat-preservation stage, so that the separated carbon dioxide can be quickly discharged, and the high purity of the calcium oxide product is favorably ensured. The calcium oxide is milled and packaged within one hour after being taken out of the kiln, so that the calcium oxide product is prevented from absorbing impurities and moisture in the air to influence the quality. The calcium oxide produced by the method can reach high purity and high activity, and the calcium oxide product can meet the high-end requirement required in the market.
Preferably, an inductance coil is installed in the side wall of a kiln body of the electric kiln, the upper end and the lower end of the inductance coil are respectively close to the upper end and the lower end of the kiln body, in the process of pressing the calcite molding block, a heating body is installed in the calcite molding block, the heating body comprises an electromagnetic induction metal core and protective ceramics, the electromagnetic induction metal core is hermetically arranged in the protective ceramics, in the process of calcining the calcite molding block by the electric kiln, the inductance coil is electrified to electromagnetically heat the electromagnetic induction metal core in the calcite molding block, so that the calcite molding block is simultaneously heated from outside to inside and from inside to outside; and sixthly, taking out a heating body in the calcium oxide before the calcium oxide is taken out of the kiln and ground.
When the electric burning furnace kiln heats and calcines the calcite molding block through the electric heating wire, the induction coil is electrified to carry out electromagnetic heating on the electromagnetic induction metal core in the calcite molding block, so that the calcite molding block is heated by outwards inwards and outwards simultaneously, the internal and external heat absorption balance of the calcite molding block is ensured, the local burning and overburning phenomena are avoided, and the quality of a calcium oxide product is effectively improved.
Preferably, the electric kiln repeatedly lifts and lowers the kiln car up and down during the process of calcining the calcite molded blocks. The kiln car is lifted up and down in a reciprocating manner, so that the uniform heating and calcination of all positions of the calcite forming blocks are facilitated, the phenomena of raw burning and overburning are avoided, and the quality of calcium oxide is ensured.
Preferably, a plurality of support tubes are mounted on the upper surface of the kiln car, the lower ends of the support tubes are communicated with the air inlet holes, a plurality of layers of trays are arranged above the kiln car at intervals, the trays are sleeved on the support tubes, limit flanges which are turned upwards are arranged at the edges of the trays, a plurality of air vents are arranged in the trays and are communicated with the support tubes, a plurality of air outlet holes are arranged on the upper surface of the tray corresponding to each air vent, and the air outlet holes are communicated with the air vents; and fourthly, stacking calcite forming blocks on a tray on the kiln car, and reserving a ventilation gap between the calcite forming blocks.
When leading to oxygen and removing carbon, oxygen passes through the inlet port inflow stay tube to through the air vent outflow from the venthole on the tray, let in between the calcite shaping piece, the ventilation effect is good, is favorable to carbon dioxide's thorough discharge, ensures the high purity of product. When the calcination is accomplished and is unloaded, only need take off the tray from the stay tube layer upon layer, with the calcium oxide on the tray pour into the milling machine and carry out the crocus can, it is convenient to unload. The limiting flanging plays a good role in protecting the calcite forming block, and the phenomenon of dumping is prevented.
Compared with the prior art, the invention has the beneficial effects that: the calcium oxide produced by the calcium oxide electric burning kiln can reach high purity and high activity, and the calcium oxide product can reach the high-end requirement required in the market.
Drawings
FIG. 1 is a schematic structural view of a kiln body of the present invention;
FIG. 2 is a schematic structural view of a kiln car of the present invention;
FIG. 3 is a schematic view of the partial structure of FIG. 2 of the present invention;
fig. 4 is a cross-sectional view of a calcite shaped block of the present invention;
in the figure: 1. the kiln body, 2, kiln car, 3, calcite shaping piece, 4, kiln door, 5, heating wire, 6, inlet port, 7, thermal-insulated base, 8, stay tube, 9, tray, 10, spacing turn-ups, 11, air vent, 12, guide rail, 13, venthole, 14, flange, 15, block, 16, inductance coils, 17, electromagnetic induction metal core, 18, protective ceramics, 19, protective sheath, 20, spout, 21, gyro wheel, 22, guide post, 23, lift piston cylinder, 24, sleeve pipe.
Detailed Description
The technical scheme of the invention is further described in detail by the following specific embodiments in combination with the attached drawings:
example (b): a high-activity 99-grade calcium oxide electric burning kiln (see attached figures 1 to 4) comprises a kiln body 1 and a kiln car 2 movably arranged in the kiln body, wherein a guide rail 12 is arranged below the kiln body, a sliding groove 20 is formed in the lower surface of the kiln car, a roller 21 is arranged in the sliding groove, the sliding groove on the kiln car is matched with the guide rail, and the roller is supported on the guide rail. Pile up the calcite shaping piece 3 that is formed by broken calcite compression molding on the kiln car, leave ventilation gap between the calcite shaping piece, be equipped with kiln door 4 on the kiln body, all install heating wire 5 on kiln internal wall and the kiln door internal surface on the kiln, be equipped with inlet port 6 on the kiln car, inlet port one end and kiln body inner chamber intercommunication, the mechanism of admitting air is connected to the inlet port other end, thermodetector is installed to kiln body inner chamber, thermodetector, pressure detector, the mechanism of admitting air includes the gas holder, the solenoid valve, flow detector, the controller, install the intake pipe between gas holder and the inlet port, the solenoid valve, flow detector all installs in the intake pipe, the heating wire, thermodetector, pressure detector, the solenoid valve, the equal electricity of flow detector is connected on the controller, kiln body upper end is equipped with the gas outlet.
The kiln car is provided with a heat insulation base 7 in a lifting way, and the air inlet is arranged on the heat insulation base. The lower surface of the heat insulation base is connected with a guide post 22 and a telescopic rod of a lifting piston cylinder, the lifting piston cylinder 23 is installed below the heat insulation base on the kiln car, a guide hole matched with the guide post is formed in the lower portion of the heat insulation base on the kiln car, and the guide post is movably inserted into the guide hole.
The kiln car upper surface is last to install a plurality of stay tubes 8, and the stay tube lower extreme all communicates with the inlet port, and kiln car top interval is equipped with a plurality of layers of tray 9, and the tray suit is on the stay tube, and the tray edge is equipped with the spacing turn-ups 10 that upwards turns up, is equipped with a plurality of air vent 11 in the tray, and the air vent communicates the stay tube, corresponds with every air vent on the tray upper surface and is equipped with a plurality of venthole 13, venthole and air vent intercommunication. The tray is provided with a sleeve 24 at the connecting position with the support tube, the lower surface of the previous tray is supported at the upper end of the sleeve on the next tray, the outer wall of the sleeve is provided with a plurality of through holes, and the through holes penetrate through the support tube. The outer wall of the lower end of the supporting pipe is step-shaped, and the tray at the lowest part is supported on the transition surface at the step-shaped position of the lower end of the supporting pipe. A circle of flange 14 is arranged at the edge of an air outlet on the upper surface of the tray, a cover cap 15 is connected to the flange, and a ventilation gap is formed between the cover cap and the flange. The arrangement of the flange and the cover cap prevents the crushed calcium oxide from falling into the air outlet, and ensures the circulation of the air outlet.
An inductance coil 16 is arranged in the side wall of the kiln body, the upper end and the lower end of the inductance coil are respectively close to the upper end and the lower end of the kiln body, a heating body is arranged in the calcite forming block and comprises an electromagnetic induction metal core 17 and protective ceramic 18, and the electromagnetic induction metal core is sealed in the protective ceramic. The outer wall of the inductance coil is sleeved with a protective sleeve 19. The protective sleeve plays a role in heat insulation protection for the inductance coil. One part of the inductance coil is arranged in the kiln body, the other part of the inductance coil is arranged in the kiln door, and the two parts of the inductance coil are inserted and conducted.
During calcium oxide production, high-quality calcite is firstly crushed, then the calcite is pressed into calcite forming blocks with brick-shaped structures, and the calcite forming blocks are stacked on a kiln car, so that a sufficient ventilation gap is reserved between every two adjacent calcite forming blocks. And then pushing the kiln car into the kiln body, closing the kiln door, and starting the electric kiln to calcine the calcite molding blocks. In the calcining process, oxygen is introduced into the kiln body through the air inlet hole to remove carbon dioxide, so that the separated carbon dioxide can be rapidly discharged, and the high purity of the calcium oxide product is favorably ensured. The controller controls the heating power of the heating wire according to the temperature in the kiln body detected by the temperature detector, so that the temperature in the kiln body can be accurately controlled. The controller controls the flow of the oxygen led into the kiln body through the pressure in the kiln body detected by the pressure detector, feeds back the actual oxygen flow detected by the flow detector to the controller, and controls the opening of the electromagnetic valve according to the fed-back oxygen flow information. The controller can be arranged in a computer program control system, the oxygen flow and the temperature and the pressure in the kiln body are controlled by the computer program control system, a fireman can master the furnace condition and adjust the furnace condition according to the detection data, the operation is simplified, and the labor intensity is reduced. When the electric burning furnace kiln heats and calcines the calcite molding block through the electric heating wire, the induction coil is electrified to carry out electromagnetic heating on the electromagnetic induction metal core in the calcite molding block, so that the calcite molding block is heated by outwards inwards and outwards simultaneously, the internal and external heat absorption balance of the calcite molding block is ensured, the local burning and overburning phenomena are avoided, and the quality of a calcium oxide product is effectively improved.
A calcium oxide calcining method using a high-activity 99-grade calcium oxide electric kiln,
firstly, selecting calcite as a raw material, cleaning and draining;
secondly, crushing calcite, controlling the granularity to be 60-100 meshes, and screening calcite particles with the approximate particle size for later use;
thirdly, pressing the calcite particles into cuboid calcite molding blocks, wherein the size of each calcite molding block is 250mm × 120mm × 50mm, and then dehydrating and drying; the hardness of the calcite raw ore is 3-4 level, the hardness of the calcite forming block is controlled below 2 level through pressure control in the press-mounting process, and micro-gaps are formed in the press-mounted calcite forming block, so that the calcined calcium oxide product is fine in crystallization;
fourthly, stacking the dehydrated and dried calcite forming blocks on a kiln car, pushing the kiln car into the kiln body, and covering a kiln door;
fifthly, calcining the calcite molding block by an electric burning furnace kiln, heating for 20-30 hours through a medium-temperature heating and heat absorbing stage at 500-850 ℃, and heating for 24 hours in the embodiment to enable the calcite molding block to reach 850 ℃ from outside to inside; then heating for 10-15 hours at 850-1150 ℃ in the high-temperature calcination stage, wherein the heating time is 12 hours in the embodiment, and the heating speed is controlled at 15-20 ℃ per hour; then, after a constant temperature and heat preservation stage at 1150 ℃ for 25-35 hours, the temperature is controlled to be 30 hours in the embodiment; introducing oxygen into the kiln body to remove carbon dioxide in the high-temperature calcination stage and the constant-temperature and heat-preservation stage;
and sixthly, discharging the calcium oxide out of the kiln after the temperature in the kiln body is reduced to 580 ℃, immediately performing grinding operation in a totally-closed workshop after discharging, and quickly packaging the calcium oxide in bags, wherein the time from discharging the calcium oxide out of the kiln to finishing packaging is controlled within one hour.
Installing an inductance coil in the side wall of a kiln body of an electric kiln, wherein the upper end and the lower end of the inductance coil are respectively close to the upper end and the lower end of the kiln body, in the process of pressing the calcite molding block, a heating body is installed in the calcite molding block, the heating body is pressed in the calcite molding block and comprises an electromagnetic induction metal core and protective ceramics, the electromagnetic induction metal core is sealed and arranged in the protective ceramics, in the process of calcining the calcite molding block by the electric kiln, the inductance coil is electrified to carry out electromagnetic heating on the electromagnetic induction metal core in the calcite molding block, so that the calcite molding block is heated from outside to inside and from inside to outside simultaneously; and sixthly, taking out the heating body in the calcium oxide before the calcium oxide is taken out of the kiln and ground, wherein the taken-out heating body can be repeatedly used.
The kiln car is characterized in that a plurality of support tubes are mounted on the upper surface of the kiln car, the lower ends of the support tubes are communicated with air inlet holes, a plurality of layers of trays are arranged above the kiln car at intervals, the trays are sleeved on the support tubes, limit flanges which are turned upwards are arranged at the edges of the trays, a plurality of air vents are arranged in the trays and are communicated with the support tubes, a plurality of air outlet holes are arranged on the upper surface of the tray and correspond to each air vent, and the air outlet holes are communicated with the air vents; and fourthly, stacking calcite forming blocks on a tray on the kiln car, and reserving a ventilation gap between the calcite forming blocks. When carrying out logical oxygen decarbonization, oxygen passes through the inlet port inflow stay tube to through the air vent outflow on the air vent follow tray, let in between the calcite shaping piece, the ventilation effect is good, is favorable to the thorough discharge of carbon dioxide, ensures the high purity of product. When the calcination is accomplished and is unloaded, only need take off the tray from the stay tube layer upon layer, with the calcium oxide on the tray pour into the milling machine and carry out the crocus can, it is convenient to unload. The limiting flanging plays a good role in protecting the calcite forming block, and the phenomenon of dumping is prevented. In the process of calcining the calcite molding block by the electric kiln, the kiln car is repeatedly lifted up and down.
The process is a more critical link, 100 g of calcium oxide produced by the scheme is placed in 400 ml of water (water temperature is 25 ℃) and heated to 80 ℃ within one minute, when the temperature is reduced from 1150 ℃ to 200 ℃, the water absorption of the calcium oxide reaches 3-4%, if the temperature is reduced to 100 ℃, the water absorption reaches 5-6%, the calcium oxide is processed at 500 ℃, the processing time exceeds one hour, the water absorption of the calcium oxide reaches 1-1.5%, and the water absorption is very quick. According to the scheme, the calcium oxide is reduced to 580 ℃ from 1150 ℃, the calcium oxide is immediately subjected to milling operation in a fully-closed workshop after being discharged from the kiln, and is quickly packaged in a bag, the time from the discharge of the calcium oxide to the completion of packaging is controlled within one hour, the moisture absorbed by the calcium oxide is extremely small, and the quality of a calcium oxide product is ensured.
The quality indexes of the calcite raw material adopted by the scheme are as follows:
the quality indexes of the calcium oxide produced by the scheme are as follows:
the calcium oxide that this scheme was produced carries out contrast experiment with traditional calcium oxide, weighs calcium oxide 100 grams, arranges the 400 milliliters aquatic of 25 degrees centigrade temperature in, and intensive mixing records 1 minute solution temperature, and the data is as follows:
the data in the table show that the calcium oxide product produced by the technical scheme of the invention achieves double high quality of high purity and high activity, and can meet the high-end requirement on calcium oxide in the market.
The above-described embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and other variations and modifications may be made without departing from the spirit of the invention as set forth in the claims.
Claims (9)
1. A high-activity 99-grade calcium oxide electric burning furnace kiln is characterized by comprising a kiln body and a kiln car movably arranged in the kiln body, wherein calcite forming blocks formed by compression molding of crushed calcite are stacked on the kiln car, a kiln door is arranged on the kiln body, electric heating wires are respectively arranged on the inner wall of the kiln body and the inner surface of the kiln door, an air inlet hole is formed in the kiln car, one end of the air inlet hole is communicated with the inner cavity of the kiln body, the other end of the air inlet hole is connected with an air inlet mechanism, a temperature detector and a pressure detector are arranged in the inner cavity of the kiln body, the air inlet mechanism comprises an air storage tank, an electromagnetic valve, a flow detector and a controller, an air inlet pipe is arranged between the air storage tank and the air inlet hole, the electromagnetic valve and the flow detector are both arranged on the air inlet pipe, the electric heating wires, the temperature detector, the pressure detector, the electromagnetic valve and the flow detector are all electrically connected on the controller, and an air outlet is formed in the upper end of the kiln body; in the calcining process, oxygen is introduced into the kiln body through the air inlet hole to remove carbon dioxide, so that the separated carbon dioxide can be quickly discharged; an inductance coil is installed in the side wall of the kiln body, the upper end and the lower end of the inductance coil are respectively close to the upper end and the lower end of the kiln body, a heating body is arranged in the calcite forming block and comprises an electromagnetic induction metal core and protective ceramic, and the electromagnetic induction metal core is sealed and arranged in the protective ceramic.
2. The high activity grade 99 calcium oxide electric furnace kiln as claimed in claim 1, wherein the kiln car is provided with a heat insulation base in a lifting manner, and the air inlet is provided on the heat insulation base.
3. The high activity grade-99 calcium oxide electric furnace kiln as claimed in claim 1, wherein a plurality of support tubes are installed on the upper surface of the kiln car, the lower ends of the support tubes are all communicated with the air inlet holes, a plurality of layers of trays are arranged above the kiln car at intervals, the trays are sleeved on the support tubes, the edges of the trays are provided with limit flanges which are turned upwards, a plurality of air vents are arranged in the trays and communicated with the support tubes, and a plurality of air outlet holes are arranged on the upper surface of the trays corresponding to each air vent and communicated with the air vents.
4. The high activity grade 99 calcium oxide electric furnace according to claim 1, wherein the outer wall of the induction coil is sleeved with a protective sleeve.
5. The high activity grade 99 calcium oxide electric furnace kiln as claimed in claim 1, wherein one part of the inductance coil is arranged in the kiln body, the other part is arranged in the kiln door, and the two parts of the inductance coil are inserted and conducted.
6. A calcium oxide calcination method using the high activity grade 99 calcium oxide electric kiln according to claim 1,
firstly, selecting calcite as a raw material, cleaning and draining;
secondly, crushing calcite, and screening calcite particles with the particle size close to that of the calcite particles for later use;
thirdly, pressing calcite particles into cuboid calcite forming blocks, and then dehydrating and drying;
fourthly, stacking the dehydrated and dried calcite molding blocks on a kiln car, pushing the kiln car into the kiln body, and covering a kiln door;
fifthly, calcining the calcite molding block by using an electric kiln, heating for 20-30 hours through a medium-temperature heating and heat absorbing stage at 500-850 ℃ to enable the temperature of the calcite molding block to reach 850 ℃ from outside to inside; then heating for 10-15 hours in a high-temperature calcination stage at 850-1150 ℃, wherein the heating rate is controlled at 15-20 ℃ per hour; then carrying out a constant temperature and heat preservation stage at 1150 ℃ for 25-35 hours; introducing oxygen into the kiln body to remove carbon dioxide in the high-temperature calcination stage and the constant-temperature and heat-preservation stage;
and sixthly, discharging the calcium oxide out of the kiln after the temperature in the kiln body is reduced to 580 ℃, immediately performing grinding operation in a totally-closed workshop after discharging, and quickly packaging the calcium oxide in bags, wherein the time from discharging the calcium oxide out of the kiln to finishing packaging is controlled within one hour.
7. The calcine method of high activity grade 99 calcine electric kiln, according to claim 6, wherein the induction coil is installed in the side wall of the kiln body of the electric kiln, the upper and lower ends of the induction coil are respectively close to the upper and lower ends of the kiln body, during the press-fitting of the calcite forming block, the heating body is installed in the calcite forming block, the heating body is pressed in the calcite forming block, the heating body comprises an electromagnetic induction metal core and a protective ceramic, the electromagnetic induction metal core is sealed in the protective ceramic, during the calcine process of the calcite forming block by the electric kiln, the induction coil is electrified to carry out electromagnetic heating on the electromagnetic induction metal core in the calcite forming block, so that the calcite forming block is heated from outside to inside and from inside to outside simultaneously; and sixthly, taking out a heating body in the calcium oxide before the calcium oxide is taken out of the kiln and ground.
8. The calcia calcining method of the high-activity grade-99 calcia electric calcining kiln as claimed in claim 6, wherein the kiln car is repeatedly lifted up and down during the process of calcining the calcite molded blocks by the electric calcining kiln.
9. The calcine calcining method of the high activity grade 99 calcine electric kiln as recited in claim 6, wherein a plurality of support tubes are installed on the upper surface of the kiln car, the lower ends of the support tubes are all communicated with the air inlet holes, a plurality of layers of trays are arranged above the kiln car at intervals, the trays are sleeved on the support tubes, the edges of the trays are provided with limit flanges which are turned upwards, a plurality of vent holes are arranged in the trays, the vent holes are communicated with the support tubes, a plurality of air outlet holes are arranged on the upper surface of the tray corresponding to each vent hole, and the air outlet holes are communicated with the vent holes; and fourthly, stacking calcite forming blocks on a tray on the kiln car, and reserving a ventilation gap between the calcite forming blocks.
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| CN204848667U (en) * | 2015-08-31 | 2015-12-09 | 建德市新安江永合塑胶厂 | Calcium oxide calcining kiln device |
| CN204874307U (en) * | 2015-08-31 | 2015-12-16 | 建德市新安江永合塑胶厂 | Calcium oxide calcining kiln |
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Denomination of invention: High activity 99 level calcium oxide electric calcination furnace and calcination method Effective date of registration: 20231208 Granted publication date: 20221223 Pledgee: Zhejiang Jiande Rural Commercial Bank Co.,Ltd. Yangxi Sub branch Pledgor: JIANDE TAIHE NEW MATERIAL Co.,Ltd. Registration number: Y2023330002972 |
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