CN111410442B - High-quality production process of active calcium oxide - Google Patents

High-quality production process of active calcium oxide Download PDF

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CN111410442B
CN111410442B CN202010308057.3A CN202010308057A CN111410442B CN 111410442 B CN111410442 B CN 111410442B CN 202010308057 A CN202010308057 A CN 202010308057A CN 111410442 B CN111410442 B CN 111410442B
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calcite
calcium oxide
blocky
parts
pouring
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CN111410442A (en
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何家平
许其林
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Anhui Oriental Calcium Co ltd
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Anhui Oriental Calcium Co ltd
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C21/00—Disintegrating plant with or without drying of the material
    • 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
    • C04B2/104—Ingredients added before or during the burning process
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
    • C08L83/04—Polysiloxanes
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
    • C09K5/08—Materials not undergoing a change of physical state when used
    • C09K5/14—Solid materials, e.g. powdery or granular
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/38—Boron-containing compounds
    • C08K2003/382—Boron-containing compounds and nitrogen
    • C08K2003/385—Binary compounds of nitrogen with boron
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
    • C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure

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  • Engineering & Computer Science (AREA)
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Abstract

The invention relates to a high-quality production process of active calcium oxide, which comprises the following steps: (1) selecting blocky calcite; (2) arranging a vent hole; (3) arranging a pouring hole, and pouring high-heat-conductivity pouring sealant; (4) the circulating hot air impacts on the blocky calcite, the temperature is 380-420 ℃, and the calcining time is 4-6 hours; (5) continuously heating to 800-1000 ℃, and calcining for 10-12 h; (6) removing the heat-conducting adhesive tape to obtain high-quality calcium oxide; the method has the advantages that the method selects the blocky calcite with moderate size, omits the crushing and screening processes, and utilizes the circulating hot air to impact on the blocky calcite, so that the surface of the blocky calcite and the inner wall of the vent hole are uniformly heated, and the heating uniformity of the blocky calcite is improved; set up heat conduction adhesive tape, can reduce cubic calcite surface and inside temperature difference inside high temperature transfer to cubic calcite in the case of calcining, at cubic calcite calcination in-process, increase titanium dioxide's disengagement amount to realize preparing high-quality calcium oxide.

Description

High-quality production process of active calcium oxide
Technical Field
The invention relates to the technical field of calcium oxide production, in particular to a high-quality production process of active calcium oxide.
Background
China is one of the earliest countries for producing and utilizing calcium oxide. Although China is a big energy country, the traditional lime kiln has large pollution, poor quality, high energy consumption and low yield due to the backward process, the quality of the burnt lime cannot meet the quality requirement, and the difference is very large compared with the world advanced full-automatic calcination. The traditional calcium oxide production method generally adopts limestone as a raw material, the limestone and solid fuel are mixed together and are loaded into a kiln body for calcination, and the calcium oxide produced by the method is easy to mix with ash, the ash is not easy to separate, and the quality of the calcium oxide is seriously influenced.
Chinese patent with an authorization publication number of CN105217974A discloses a production process and a device of high-quality calcium oxide, wherein in the first step of the invention, calcite is selected as a raw material, and the raw material is cleaned and drained; secondly, crushing calcite, and screening calcite particles with the particle size close to that of the calcite particles for later use; thirdly, feeding calcite raw material into a shuttle kiln for calcination; fourthly, discharging the calcium oxide out of the kiln, cooling the calcium oxide to about 400 ℃, and then discharging the calcium oxide out of the kiln, and grinding the calcium oxide at more than 200 ℃; fifthly, immediately sending the ground calcium oxide into a closed drying bin for cooling, immediately bagging and packaging when the calcium oxide is cooled to about 50 ℃, wherein the time interval from the calcium oxide discharging from a kiln to the completion of packaging is within 30 minutes.
However, the above production process has the following drawbacks: in the calcining process of the calcite, the separation of carbon dioxide is slowly carried out from the surface to the inside, and in the second step, the calcite needs to be crushed, and calcite particles with approximate particle size are screened for later use; if the particle size of the crushed calcite is larger, the temperature on the surface and in the calcite is not uniform enough when the calcite is heated, so that the phenomenon of under-burning or over-burning exists, and the quality of the calcined calcium oxide is influenced; if the particle size of the crushed calcite is smaller, the crushing and screening process wastes time and labor.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a high-quality production process of active calcium oxide, which is beneficial to improving the heating uniformity of calcite, and can save the screening process and save time and labor.
The above object of the present invention is achieved by the following technical solutions:
a high-quality production process of active calcium oxide comprises the following steps:
(1) selecting blocky calcite;
(2) the upper surface and the lower surface of the blocky calcite are provided with vent holes, and the density of the vent holes is 20-30/m2；
(3) Arranging a plurality of horizontally-penetrating pouring holes on the side surface of the massive calcite, wherein the pouring holes are not communicated with the vent holes, and pouring high-heat-conductivity pouring sealant into the pouring holes;
(4) placing the punched blocky calcite in a calcining box, and impacting circulating hot air on the blocky calcite at the temperature of 380-420 ℃ for calcining for 4-6 h;
(5) continuously heating to 800-1000 ℃, and calcining for 10-12 h to obtain high-quality calcium oxide;
(6) and after cooling to room temperature, removing the heat-conducting adhesive tape, and crushing the high-quality calcium oxide.
By adopting the technical scheme, the blocky calcite with moderate volume and regular appearance is selected for standby, the crushing and screening processes are omitted, the vent holes and the glue pouring holes are formed in the blocky calcite, and then the high-heat-conductivity pouring sealant is poured into the glue pouring holes; then, the blocky calcite is placed in a calcining box, the blocky calcite is calcined, circulating hot air impacts on the blocky calcite, the surface of the blocky calcite and the inner wall of the vent hole are uniformly heated, and the heating uniformity of the blocky calcite is improved; high heat conduction casting glue forms the heat conduction adhesive tape in the encapsulating hole, under the heating condition, heat conduction adhesive tape solidification speed is faster, the curing effect is better, and heat conduction adhesive tape has good heat conduction, the radiating effect, can be inside high temperature transfer to cubic calcite calcining the incasement, reduce cubic calcite surface and inside temperature difference, in cubic calcite calcination process, increase titanium dioxide's disengagement volume, thereby realize preparing high-quality calcium oxide, and the steam generator has the advantages of simple process, time saving and labor saving, and high product quality.
The present invention in a preferred example may be further configured to: the side wall of the calcining box close to the bottom is provided with a first air inlet, the side wall of the calcining box close to the top is provided with a second air inlet, the top of the calcining box is provided with a first air suction opening, the bottom of the calcining box is provided with a second air suction opening, the first air inlet is matched with the first air suction opening for operation, the second air inlet is matched with the second air suction opening for operation, and the first air inlet and the second air inlet are alternately operated.
By adopting the technical scheme, hot air is fed into the calcining box by utilizing the first air inlet, impacts on the lower surface of the massive calcite and passes through the massive calcite through the vent hole, and then is extracted from the first air suction port; after the air supply of the first air inlet is finished, the second air inlet supplies hot air into the calcining box again, the hot air impacts the upper surface of the blocky calcite and passes through the blocky calcite through the vent hole, and the hot air is pumped out from the second air suction port; first air intake, second air intake alternate operation help realizing the surface and the inside even heating of blocky calcite, further improve the homogeneity of being heated of blocky calcite.
The present invention in a preferred example may be further configured to: the vent holes in the step (2) comprise a first vent hole and a second vent hole which are vertically connected and have different apertures, and adjacent vent holes are arranged in an inverted mode.
Through adopting above-mentioned technical scheme, the aperture in first ventilation hole and second ventilation hole is different, and first ventilation hole is vertical arranges with the second ventilation hole, it is big to show the one end aperture in ventilation hole, the other end aperture is little, hot-blast big aperture one end that tends to follow the ventilation hole is sent into, send out from the small aperture one end in ventilation hole, because adjacent ventilation hole is the setting of arranging that reverses, at first air intake, under the air supply effect of second air intake, help hot-blast impact in turn at the upper and lower surface of cubic calcite, thereby realize the surface and the inside even heating to the cubic calcite, air supply efficiency and hot-blast heating efficiency to the calcite have been improved.
The present invention in a preferred example may be further configured to: and the first vent hole and the second vent hole are formed by processing a spiral reamer.
Through adopting above-mentioned technical scheme, first ventilation hole, second ventilation hole form through spiral reamer processing, show that the inner wall in first ventilation hole, second ventilation hole is helical curved surface, when hot-blast when first ventilation hole, second ventilation hole, partial heat can persist in first ventilation hole, second ventilation hole, help improving hot-blast heating degree to the inside of cubic calcite, further reduce cubic calcite surface and inside temperature difference.
The present invention in a preferred example may be further configured to: the glue pouring holes are distributed on the geometric middle line of the blocky calcite, and the glue pouring holes are uniformly distributed along the height direction of the blocky calcite.
Through adopting above-mentioned technical scheme, the region at the geometric centre line place of cubic calcite is regional for the inside center of cubic calcite, belongs to the most difficult hot spot of receiving, and the encapsulating hole is arranged in inside center region, and the heat conduction adhesive tape has good heat conduction effect, can transmit the temperature on cubic calcite surface to the inside center of cubic calcite regional to improve the degree of being heated of inside center region.
The present invention in a preferred example may be further configured to: and (5) solidifying the heat-conducting adhesive strips in the step (6) in the glue pouring holes by adopting high-heat-conducting pouring glue.
Through adopting above-mentioned technical scheme, high heat conduction casting glue is filled downthehole at the encapsulating, and along with the rising of temperature, high heat conduction casting glue solidifies into heat conduction adhesive tape, because calcination temperature is higher, heat conduction adhesive tape solidification is effectual, and heat conduction adhesive tape's structure compactness is higher, conveniently shifts out heat conduction adhesive tape, reduces the heat conduction adhesive tape rupture downthehole at the encapsulating, has improved production technology's stability.
The present invention in a preferred example may be further configured to: the pulverization in the step (6) is carried out in a nitrogen atmosphere.
By adopting the technical scheme, the calcium oxide is easy to absorb water in the air, so that the crushing process is limited to be carried out in a nitrogen environment, the water absorption and deterioration of the calcium oxide are reduced, and the quality of the calcium oxide is further improved.
The present invention in a preferred example may be further configured to: the high-thermal-conductivity pouring sealant is prepared by mixing a component A and a component B in a weight ratio of 1: 1; the component A is mainly prepared from the following components in parts by weight: 100 parts of vinyl silicone oil, 30-80 parts of inorganic heat-conducting filler and 1.5-5 parts of platinum catalyst; the component B is mainly prepared from the following components in parts by weight: 70-80 parts of vinyl silicone oil, 20-25 parts of hydrogen-containing silicone oil, 30-80 parts of inorganic heat-conducting filler and 0.5-2 parts of ethynylcyclohexane.
By adopting the technical scheme, the high-thermal-conductivity pouring sealant is prepared by mixing the component A and the component B, vinyl silicone oil is used as a main component, inorganic thermal-conductive filler is used as an auxiliary material, ethynylcyclohexane is used as an inhibitor, the component A and the component B are mixed and stirred, and then a mixture is cured and molded at a calcining temperature, the components have good fluidity, and after a thermal-conductivity adhesive tape is molded, the thermal-conductivity adhesive tape is easy to demould and move out, so that the thermal-conductivity adhesive tape is convenient to separate from massive calcite.
The present invention in a preferred example may be further configured to: the inorganic heat-conducting filler is prepared by the following method: mixing silicon carbide and boron nitride in a weight ratio of 1:1, adding a silane coupling agent in a spraying mode under a stirring state, heating to 100 +/-5 ℃, continuing stirring for 30min, and cooling to room temperature for later use.
By adopting the technical scheme, the silicon carbide and the boron nitride are inorganic fillers with excellent heat-conducting property, and the silane coupling agent is sprayed on the surfaces of the silicon carbide and the boron nitride in the application, so that the surface activity of the silicon carbide and the boron nitride is improved, and the bonding tightness of the silicon carbide, the boron nitride and the vinyl silicone oil is improved.
In summary, the invention includes at least one of the following beneficial technical effects:
1. according to the application, the vent holes and the glue pouring holes are formed in the massive calcite, the high-heat-conduction pouring glue is poured into the glue pouring holes, circulating hot air passes through the massive calcite through the vent holes and can heat the surface and the interior of the massive calcite, the high-heat-conduction pouring glue is solidified in the glue pouring holes to form the heat-conduction adhesive tape, the heat-conduction adhesive tape can transfer the high temperature of the surface of the massive calcite to the interior of the massive calcite, the temperature difference between the surface and the interior of the massive calcite can be reduced, and the surface and the interior of the massive calcite can be heated uniformly;
2. hot air is alternately pumped into the first air inlet and the second air inlet and respectively impacts the upper surface and the lower surface of the blocky calcite, and tends to be blown in from the large-aperture end of the vent hole, so that the heating efficiency of the hot air on the blocky calcite is improved;
3. the first vent hole and the second vent hole are formed by machining through spiral reamers, so that heat is favorably accumulated in the first vent hole and the second vent hole, the internal temperature of the massive calcite is increased, and the temperature difference between the surface and the inside of the massive calcite is reduced;
4. because the temperature is higher in the calcining process, the curing speed of the high-heat-conduction encapsulating adhesive is high, the compactness of the heat-conduction adhesive tape is excellent, the demolding effect of the heat-conduction adhesive tape is good, and the heat-conduction adhesive tape can be conveniently moved out of the encapsulating hole;
5. the crushing process is carried out in a nitrogen environment, which is beneficial to further improving the quality of calcium oxide;
6. the method selects the blocky calcite with the proper size, omits the crushing and screening processes, and has the advantages of time saving and labor saving;
7. the process has short calcining time and greatly shortened production process.
Drawings
Figure 1 is a schematic representation of the structure of calcined, bulk calcite.
Fig. 2 is a sectional view of the calcining box, which is used for embodying the position relationship of the first air inlet, the second air inlet, the first air suction opening and the second air suction opening.
Fig. 3 is a schematic structural view of a first vent hole and a second vent hole in the fifth embodiment.
In the figure, 0, bulk calcite; 1. a vent hole; 11. a first vent hole; 12. a second vent hole; 2. filling glue holes; 3. calcining the box; 31. a first air inlet; 32. a second air inlet; 33. a first suction opening; 34. a second suction opening; 4. a heat conducting adhesive tape.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and examples.
The vinyl silicone oil is purchased from Guanguan Tianshu silica gel technology Co., Ltd, and the trade name is TNVF-viscosity; the hydrogen-containing silicone oil is purchased from silicone raw material company Limited of polymer industry in Guangzhou city; calcite is mined from the gaquzhou congqu river district top town fairy cave dolomite ore, and figure 1 is the simple and easy structure schematic diagram of cubic calcite in this application, and cubic calcite is rough in surface, unsmooth in reality.
The inorganic heat-conducting filler is prepared by the following method:
(1) weighing 250 parts of silicon carbide and 250 parts of boron nitride and KH 57010 parts by weight respectively;
(2) mixing silicon carbide and boron nitride at a weight ratio of 1:1, adding a silane coupling agent KH-570 in a spraying manner under a stirring state, heating to 100 ℃, continuously stirring for 30min, and cooling to room temperature for later use.
Preparation example one of high thermal conductivity pouring sealant:
a high heat conduction pouring sealant is prepared by mixing a component A and a component B in a weight ratio of 1: 1;
the component A is prepared by the following steps: (1) preparing materials: weighing 100 parts of vinyl silicone oil, 30 parts of inorganic heat-conducting filler and 1.5 parts of platinum catalyst according to parts by weight; (2) mixing the components, grinding and dispersing uniformly for later use;
the component B is prepared by the following steps: (1) preparing materials: weighing 70 parts of vinyl silicone oil, 20 parts of hydrogen-containing silicone oil, 30 parts of inorganic heat-conducting filler and 0.5 part of ethynylcyclohexane according to parts by weight; (2) the components are mixed, ground and dispersed uniformly for later use.
Preparation example two of high thermal conductivity pouring sealant:
a high heat conduction pouring sealant is prepared by mixing a component A and a component B in a weight ratio of 1: 1;
the component A is prepared by the following steps: (1) preparing materials: weighing 100 parts of vinyl silicone oil, 50 parts of inorganic heat-conducting filler and 3 parts of platinum catalyst according to parts by weight; (2) mixing the components, grinding and dispersing uniformly for later use;
the component B is prepared by the following steps: (1) preparing materials: weighing 75 parts of vinyl silicone oil, 20 parts of hydrogen-containing silicone oil, 50 parts of inorganic heat-conducting filler and 1 part of ethynylcyclohexane according to parts by weight; (2) the components are mixed, ground and dispersed uniformly for later use.
Preparation example three of high thermal conductivity pouring sealant:
a high heat conduction pouring sealant is prepared by mixing a component A and a component B in a weight ratio of 1: 1;
the component A is prepared by the following steps: (1) preparing materials: weighing 100 parts of vinyl silicone oil, 70 parts of inorganic heat-conducting filler and 4 parts of platinum catalyst according to parts by weight; (2) mixing the components, grinding and dispersing uniformly for later use;
the component B is prepared by the following steps: (1) preparing materials: weighing 75 parts of vinyl silicone oil, 20 parts of hydrogen-containing silicone oil, 70 parts of inorganic heat-conducting filler and 1.5 parts of ethynylcyclohexane according to parts by weight; (2) the components are mixed, ground and dispersed uniformly for later use.
Preparation example four of high thermal conductivity pouring sealant:
a high heat conduction pouring sealant is prepared by mixing a component A and a component B in a weight ratio of 1: 1;
the component A is prepared by the following steps: (1) preparing materials: weighing 100 parts of vinyl silicone oil, 80 parts of inorganic heat-conducting filler and 5 parts of platinum catalyst according to parts by weight; (2) mixing the components, grinding and dispersing uniformly for later use;
the component B is prepared by the following steps: (1) preparing materials: weighing 80 parts of vinyl silicone oil, 25 parts of hydrogen-containing silicone oil, 80 parts of inorganic heat-conducting filler and 2 parts of ethynylcyclohexane according to parts by weight; (2) the components are mixed, ground and dispersed uniformly for later use.
The first embodiment is as follows:
a high-quality production process of active calcium oxide comprises the following steps: (Calcite and calcining case Structure see FIGS. 1 and 2)
(1) Selecting blocky calcite 0 with the size of about 50cm by 40cm by 30 cm;
(2) the upper and lower surfaces of the blocky calcite 0 are provided with vent holes 1, the aperture is 50mm, and the density of the vent holes 1 is 20/m2；
(3) The side surface of the block-shaped calcite 0 is provided with glue filling holes 2 which horizontally penetrate through the block-shaped calcite 0, the hole diameter is 40mm, the number of the glue filling holes is 3, the glue filling holes 2 are not communicated with the vent holes 1, the glue filling holes 2 are distributed on the geometric midline of the block-shaped calcite 0, the glue filling holes 2 are uniformly distributed along the height direction of the block-shaped calcite 0, and a glue filling gun is used for filling the first preparation example into the glue filling holes 2;
(4) placing the punched blocky calcite 0 into a calcining box 3, and impacting the blocky calcite 0 by circulating hot air, wherein the temperature in the calcining box 3 is 400 ℃, and calcining for 5 hours;
(5) continuously heating to 800 ℃, and calcining for 10h to obtain high-quality calcium oxide;
(6) after cooling to room temperature, the heat-conducting adhesive tape 4 is removed, and then high-quality calcium oxide is crushed in a nitrogen environment;
wherein, in the step (4), the circulating hot air impacts on the blocky calcite 0, a first air inlet 31 is arranged on the side wall of the calcining box 3 close to the bottom, a second air inlet 32 is arranged on the side wall of the calcining box 3 close to the top, a first air suction opening 33 is arranged on the top of the calcining box 3, a second air suction opening 34 is arranged on the bottom of the calcining box 3, the first air inlet 31 and the first air suction opening 33 work in a matching mode, the second air inlet 32 and the second air suction opening 34 work in a matching mode, the first air inlet 31 and the second air inlet 32 work alternately, hot air is pumped from the first air inlet 31, the temperature is 420 ℃, part of the hot air impacts on the surface of the blocky calcite 0, and part of the hot air penetrates through the blocky calcite 0 through the vent holes 1 and then is pumped out through the first air suction opening 33; pumping hot air from a second air inlet 32 at the temperature of 420 ℃, impacting part of the hot air on the surface of the blocky calcite 0, enabling part of the hot air to pass through the blocky calcite 0 through the vent hole 1, and pumping out the hot air through a second air pumping port 34; circulating the above hot air pumping process.
Example two:
the high-quality production process of the active calcium oxide is different from the first embodiment in that the second preparation example is poured into the glue pouring hole 2 in the step (3).
Example three:
the high-quality production process of the active calcium oxide is different from the first embodiment in that the third preparation example is poured into the glue pouring hole 2 in the step (3).
Example four:
the high-quality production process of the active calcium oxide is different from the first embodiment in that the fourth preparation example is poured into the glue pouring hole 2 in the step (3).
Example five:
a high-quality production process of active calcium oxide comprises the following steps:
(1) selecting blocky calcite 0 with the size of about 50cm by 40cm by 30 cm;
(2) set up ventilation hole 1 on cubic calcite 0's upper and lower surface, ventilation hole 1 includes vertical continuous and not first ventilation hole 11 and second ventilation hole 12 in aperture, and first ventilation hole 11 forms through spiral reamer processing with second ventilation hole 12, and the aperture of first ventilation hole 11 is about 50mm, and the aperture of second ventilation hole 12Is 30mm, 2 first vent holes 11 and 2 second vent holes 12 are arranged in the embodiment, the adjacent vent holes 1 are arranged in an inverted mode, and the density of the vent holes 1 is 20/m2；
(3) The side surface of the massive calcite 0 is provided with glue filling holes 2 which horizontally penetrate through the side surface, the aperture is 40mm, the number of the glue filling holes is 3, the glue filling holes 2 are not communicated with the vent holes 1, the glue filling holes 2 are distributed on the geometric midline of the massive calcite 0, the glue filling holes 2 are uniformly distributed along the height direction of the massive calcite 0, and a third preparation example is filled into the glue filling holes 2;
(4) placing the punched blocky calcite 0 into a calcining box 3, and impacting the blocky calcite 0 by circulating hot air at the temperature of 400 ℃ for calcining for 5 hours;
(5) continuously heating to 800 ℃, and calcining for 10h to obtain high-quality calcium oxide;
(6) after cooling to room temperature, the heat conducting rubber strip 4 is removed, and then the high-quality calcium oxide is crushed in the nitrogen environment.
Comparative example one:
the invention discloses a high-quality calcium oxide production process in Chinese patent with the publication number of CN105217974A, and compares the high-purity calcium oxide 1# in the invention mentioned in the application.
Comparative example two:
a high-quality production process of active calcium oxide comprises the following steps:
(1) selecting blocky calcite with the size of about 50cm by 40cm by 30 cm;
(2) placing the blocky calcite in a calcining box, wherein the temperature in the calcining box is 400 ℃, and calcining for 5 hours;
(3) continuously heating to 800 ℃, and calcining for 10h to obtain high-quality calcium oxide;
(4) after cooling to room temperature, high-quality calcium oxide is crushed.
Comparative example three:
compared with the three phases of the embodiment, the high-quality production process of the active calcium oxide omits the steps of arranging the pouring hole 2 and pouring the high-heat-conduction pouring sealant.
The detection means is as follows:
(1) coefficient of thermal conductivity: testing the pouring sealant samples of the first preparation example to the fourth preparation example according to the ASTMD5470-2001 standard;
(2) uniformity of heating of bulk calcite: after the step (5) is finished, the heat-conducting adhesive tape is moved out by virtue of the clamping pincers, then the thermocouple is used for measuring the temperature of the surface of the massive calcite and the inside of the glue filling hole, and the temperature difference between the surface temperature and the inside temperature of the massive calcite is used for representing the heating uniformity;
(3) purity of calcium oxide: each sample of the examples and comparative examples was sent to the quality supervision and testing institute of Heilongjiang province for testing.
The results of the thermal conductivity measurements are shown in the following table:
sample (I) Thermal conductivity (W/(m.k))
Preparation example 1 2800
Preparation example two 3000
Preparation example three 3200
Preparation example four 3300
As can be seen from the above table, the sample prepared by the preparation example of the application has a thermal conductivity of 2800W/(m.k) or more and has excellent thermal conductivity.
The test results for the uniformity of heating of bulk calcite 0 are shown in the following table:
sample (I) Temperature difference (. degree.C.)
Example one 0
Example two 0
EXAMPLE III 0
Example four 0
EXAMPLE five 0
According to the table, after the production process is used for calcining, the temperature difference between the surface and the inside of the massive calcite 0 is 0 ℃, and therefore after the production process is used for calcining, the surface and the inside of the massive calcite 0 are heated uniformly, and the efficiency of calcining the massive calcite 0 is improved.
The purity of the calcium oxide was measured as shown in the following table:
sample (I) Purity of calcium oxide (%)
Example one 98.9
Example two 99.1
EXAMPLE III 99.4
Example four 99.4
EXAMPLE five 99.6
Comparative example 1 99.2
Comparative example No. two 91.2
Comparative example No. three 96.9
According to the above table, the purity of the calcium oxide prepared by the production process is high, which indicates that in the calcining process, circulating hot air continuously impacts on the surface and the inside of the massive calcite 0, the high-heat-conductivity pouring sealant is solidified into the heat-conducting adhesive tape 4 in the pouring hole 2, the heat-conducting adhesive tape 4 transfers the temperature in the calcining box 3 into the pouring hole 2 and continuously disperses in the massive calcite 0, so that the temperature in the massive calcite 0 is increased, the heating uniformity of the massive calcite 0 is improved, and the purity of the calcium oxide is finally improved; as can be seen from the first comparative example, the purity of calcium oxide is higher, but the first comparative example has long process time and wastes time and labor in the crushing and screening processes; according to the comparative example II, the heating uniformity of the blocky calcite 0 is influenced and the purity of calcium oxide is finally influenced because the blocky calcite 0 is not heated by circulating hot air; according to the third comparison example, the arrangement of the glue pouring hole 2 and the pouring of the high-thermal-conductivity pouring glue to form the thermal-conductivity glue strip 4 are beneficial to improving the temperature inside the massive calcite 0, so that the massive calcite 0 is heated uniformly, and the purity of the final product calcium oxide is improved.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.

Claims (9)

1. A high-quality production process of active calcium oxide is characterized by comprising the following steps:
(1) selecting blocky calcite (0);
(2) the upper surface and the lower surface of the blocky calcite (0) are provided with vent holes (1), and the density of the vent holes (1) is 20-30/m2；
(3) A plurality of horizontally-penetrating pouring holes (2) are formed in the side surface of the block-shaped calcite (0), the pouring holes (2) are not communicated with the vent holes (1), and high-heat-conductivity pouring sealant is poured into the pouring holes (2);
(4) placing the punched blocky calcite (0) into a calcining box (3), and impacting the blocky calcite (0) by circulating hot air at the temperature of 380-420 ℃ for calcining for 4-6 h;
(5) continuously heating to 800-1000 ℃, and calcining for 10-12 h to obtain high-quality calcium oxide;
(6) after cooling to room temperature, the heat-conducting adhesive tape (4) is removed, and then the high-quality calcium oxide is crushed.
2. The process for producing activated calcium oxide of high quality according to claim 1, wherein: the side wall that is close to the bottom at calcination case (3) is provided with first air intake (31), and the side wall that is close to the top at calcination case (3) is provided with second air intake (32), sets up first suction opening (33) at the top of calcination case (3), sets up second suction opening (34) in the bottom of calcination case (3), first air intake (31) and first suction opening (33) cooperation operation, second air intake (32) and second suction opening (34) cooperation operation, first air intake (31) and second air intake (32) alternate operation.
3. The process for producing activated calcium oxide of high quality according to claim 2, wherein: the ventilation holes (1) in the step (2) comprise a first ventilation hole (11) and a second ventilation hole (12) which are vertically connected and have different apertures, and the adjacent ventilation holes (1) are arranged in a reversed mode.
4. A high-quality process for producing activated calcium oxide according to claim 3, wherein: the first vent hole (11) and the second vent hole (12) are formed by machining a spiral reamer.
5. The process for producing activated calcium oxide of high quality according to claim 1, wherein: the glue pouring holes (2) are distributed on the geometric middle line of the blocky calcite (0), and the glue pouring holes (2) are uniformly distributed along the height direction of the blocky calcite (0).
6. The process for producing activated calcium oxide of high quality according to claim 1, wherein: and (4) solidifying the heat-conducting adhesive tape (4) in the step (6) in the pouring hole (2) by adopting high-heat-conducting pouring sealant.
7. The process for producing activated calcium oxide of high quality according to claim 1, wherein: the pulverization in the step (6) is carried out in a nitrogen atmosphere.
8. The high-quality production process of the activated calcium oxide as claimed in claim 1, wherein the high-thermal conductivity pouring sealant is prepared by mixing a component A and a component B in a weight ratio of 1: 1; the component A is mainly prepared from the following components in parts by weight: 100 parts of vinyl silicone oil, 30-80 parts of inorganic heat-conducting filler and 1.5-5 parts of platinum catalyst; the component B is mainly prepared from the following components in parts by weight: 70-80 parts of vinyl silicone oil, 20-25 parts of hydrogen-containing silicone oil, 30-80 parts of inorganic heat-conducting filler and 0.5-2 parts of ethynylcyclohexane.
9. The high-quality production process of activated calcium oxide according to claim 8, wherein the inorganic heat-conducting filler is prepared by the following method: mixing silicon carbide and boron nitride in a weight ratio of 1:1, adding a silane coupling agent in a spraying mode under a stirring state, heating to 100 +/-5 ℃, continuing stirring for 30min, and cooling to room temperature for later use.
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Publication number Priority date Publication date Assignee Title
BRPI0801785A2 (en) * 2008-05-02 2010-07-06 Duratex Sa antimicrobial glaze for ceramic tiles, process for obtaining antimicrobial glaze for ceramic tiles, antimicrobial glaze process for ceramic tiles and ceramic tile
CN104845379A (en) * 2015-04-30 2015-08-19 浙江理工大学 Solvent-free type organic silicone pouring sealant and preparation method thereof
CN105217974A (en) * 2015-08-31 2016-01-06 建德市新安江永合塑胶厂 High-quality calcium oxide production technique and device
CN108383400A (en) * 2018-05-02 2018-08-10 建德市泰合新材料有限公司 High-purity and highly active calcium oxide calcining kiln and method for calcinating

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Publication number Priority date Publication date Assignee Title
BRPI0801785A2 (en) * 2008-05-02 2010-07-06 Duratex Sa antimicrobial glaze for ceramic tiles, process for obtaining antimicrobial glaze for ceramic tiles, antimicrobial glaze process for ceramic tiles and ceramic tile
CN104845379A (en) * 2015-04-30 2015-08-19 浙江理工大学 Solvent-free type organic silicone pouring sealant and preparation method thereof
CN105217974A (en) * 2015-08-31 2016-01-06 建德市新安江永合塑胶厂 High-quality calcium oxide production technique and device
CN108383400A (en) * 2018-05-02 2018-08-10 建德市泰合新材料有限公司 High-purity and highly active calcium oxide calcining kiln and method for calcinating

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Denomination of invention: High quality production process of activated calcium oxide

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