CN112094127B - Manufacturing process of kyanite tailing series sagger - Google Patents
Manufacturing process of kyanite tailing series sagger Download PDFInfo
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- CN112094127B CN112094127B CN202011024764.6A CN202011024764A CN112094127B CN 112094127 B CN112094127 B CN 112094127B CN 202011024764 A CN202011024764 A CN 202011024764A CN 112094127 B CN112094127 B CN 112094127B
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- 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
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/16—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay
- C04B35/18—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay rich in aluminium oxide
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D5/00—Supports, screens, or the like for the charge within the furnace
- F27D5/0068—Containers
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/349—Clays, e.g. bentonites, smectites such as montmorillonite, vermiculites or kaolines, e.g. illite, talc or sepiolite
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/60—Aspects relating to the preparation, properties or mechanical treatment of green bodies or pre-forms
- C04B2235/602—Making the green bodies or pre-forms by moulding
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Abstract
The invention discloses a manufacturing process of a kyanite tailing series sagger, belonging to the technical field of high-temperature-resistant materials, and comprising a sagger and a preparation method of the sagger; the sagger is prepared from the following raw materials: kyanite tailings, soft clay and a bonding agent; the binding agent is lignosulfonate or dextrin; the particle size of the kyanite tailings is 0-2mm. The invention is used for calcining alumina, the calcining temperature is 1400-1500 ℃, the use times can reach 5-6 times, and the service life is doubled; the corrosion resistance and the high temperature resistance of the sagger are effectively improved, the problem that the sagger is used for a few times is solved, raw materials are saved, and the production cost is greatly reduced.
Description
Technical Field
The invention relates to the technical field of high-temperature-resistant materials, in particular to a manufacturing process of a kyanite tailing series sagger.
Background
At present, calcined alumina is prepared by high-temperature calcination of saggars bearing materials, generally, a circular saggar is used for loading industrial alumina and additives to carry out high-temperature reaction, certain chemical reaction is carried out on alkaline sodium oxide, acid oxide silicon dioxide and amphoteric oxide aluminum oxide in the surface layer of the saggar at high temperature to generate vitreous substances, the saggar is corroded to cause cracking, deformation and sticking, and the average index of saggar consumption is about 300 kilograms per ton of alumina. The sagger is repeatedly used by alternately using cold and heat, the traditional product is generally scrapped after being used for 2 to 3 times, and the current sagger has the main problem of being used for a few times.
The patent document with the publication number of CN101274842 discloses a method for preparing a sintered brick by taking kyanite mine tailings as raw materials, which is mainly characterized in that kyanite mine tailing powder, waste ore and a stripping layer are used as raw materials to prepare the sintered brick, so that the problem that the kyanite mine tailings are difficult to prepare the sintered brick is solved, kyanite mine waste is utilized, the occupied pollution of the kyanite mine waste to the land environment is reduced, the treatment cost of the mine waste is reduced, the land resource is saved by replacing clay raw materials, the product can be comparable to clay bricks, is used for traditional wall brick building, can be filled in frame walls, and can replace outdoor facing bricks such as burning-free square bricks and pavement bricks and have more experience of trampling resistance. The invention can bring positive influence and remarkable social and economic benefits to mine treatment, building material market, building industry and municipal construction.
The patent with the publication number of CN104150916B discloses a heat insulation brick for a roasting furnace bottom and a preparation method thereof, the heat insulation brick is formed by extruding and roasting kyanite powder, alumina powder, calcined kaolin powder and raw clay powder, and the kyanite powder accounts for 10 to 15 percent by mass and has the granularity of less than or equal to 0.1mm; 5 to 10 percent of alumina powder and the fineness of less than or equal to 0.073mm; calcined kaolin powder is 35 to 40 percent, and the fineness is less than or equal to 0.088mm; 40-45% of raw clay powder and the fineness of less than or equal to 0.088mm. The preparation process of the heat insulation brick comprises the following steps: (1) Grinding raw clay powder and calcined kaolin powder into fine powder; (2) Mixing calcined kaolin powder, kyanite powder, alumina powder and raw clay powder in proportion; (3) adding EPS beads and sawdust and mixing; (4) adding water and then mixing; (5) extruding mud for forming; and (6) drying and calcining to prepare a finished product.
The two methods both use the cyanite powder and other mineral powder as main raw materials to prepare products with high strength, but when the cyanite powder and other mineral powder are used for saggars, the problems of easy deformation and cracking, less use times and the like still exist.
Disclosure of Invention
In view of the above, the invention provides a manufacturing process of a series of sagger made of kyanite tailings, which effectively improves the corrosion resistance and high temperature resistance of the sagger and solves the problem of few sagger use times.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a manufacturing process of a series of sagger of kyanite tailings comprises the sagger and a preparation method of the sagger; the sagger is prepared from the following raw materials: kyanite tailings, soft clay and a bonding agent.
Further, the binding agent is lignosulfonate or dextrin.
Further, the particle size of the kyanite tailings is 0-2mm.
Further, the preparation method of the sagger comprises the following steps:
s1: preparing materials: weighing the raw materials in parts by weight according to a proportion, and fully stirring the binding agent and the required total added water in advance to prepare an aqueous solution;
s2: mixing materials: premixing various particles of kyanite tailings in a stirrer uniformly, adding an aqueous solution with half of the total added water amount after 3 minutes, continuously mixing for 3 minutes, adding soft clay, mixing for 3 minutes, adding the remaining half of the aqueous solution, mixing for 5-10 minutes to obtain a mixture, and putting the mixture into a mud bin to be aged for more than or equal to 4 hours;
s3: molding: putting the trapped pug into a mold, performing hydraulic forming by a hydraulic press, and brushing a layer of release agent on the mold after bricks are discharged;
s4: and (3) drying: placing the molded green body into a drying vehicle, naturally drying for 1 day, and then drying in a tunnel drying chamber for 1-2 days;
s5: and (3) firing: firing the dried green body in a high-temperature pushed slab kiln, wherein the maximum firing temperature is 1350-1450 ℃, and the heat preservation time is 4-6h;
s6: and (3) finished product: after the materials are taken out of the kiln, sorting, stacking qualified products, warehousing and packaging.
Further, in the sagger preparation method, in the step S1, the rotating speed of the stirrer is 20r/min.
Further, in the sagger preparation method, in the step S4, the residual moisture is controlled to be less than 1%.
Further, in the preparation method of the sagger, in the step S5, the heating rate is 40-50 ℃/hour.
Further, the sagger is used for loading alumina and additives required for calcining alumina.
Further, the sagger is made of the following raw materials in percentage by mass: 10-30% of kyanite tailings with the grain size of 1-2mm, 20-30% of kyanite tailings with the grain size of 0.1-1mm, 10-30% of kyanite tailings with the grain size of 0-0.1mm, 20-40% of soft clay and 0.5-2% of a bonding agent.
Further, in the preparation method of the sagger, in the step S3, the release agent is a self-made release agent, and the release agent comprises the following components in parts by weight: diesel oil: the talc powder is 3.
Further, in the sagger preparation method, in step S4, the drying temperature in the tunnel drying chamber is: the inlet is 40-50 deg.C, and the outlet is 80-100 deg.C.
Further, the weight ratio of the raw materials to the water is as follows: water: the raw materials are 1.
The sagger is made up by using refractory clay material and firing various specifications of round sagger through high-temp. firing, and the sagger is one of the important kilns for firing porcelain, and various porcelain blanks must be firstly placed in the sagger, then the kiln is fired. Sagger is a container, the role played by the ceramic industry is self-evident. Most saggers on the market are made of materials such as silicon carbide and mullite, the service life and the heating temperature can be prolonged, but the service life is greatly shortened after the heating temperature exceeds 1000 ℃. The patent with the publication number of CN108373324B discloses a light sagger for roasting a lithium battery anode material and a preparation method thereof. The technical scheme is as follows: the glaze is prepared by uniformly mixing 30-45 wt% of spodumene, 30-40 wt% of zirconite, 10-20 wt% of Suzhou soil and 5-10 wt% of titanium dioxide as raw materials, and 4-6 wt% of water. Then, taking 45-65 wt% of mullite lightweight aggregate, 15-20 wt% of kyanite, 10-20 wt% of alumina micro powder and 10-20 wt% of Suzhou soil as a mixture, adding 10-15 wt% of a bonding agent into the mixture, uniformly mixing, and performing mechanical compression molding to obtain the sagger substrate. And uniformly distributing glaze on the working surface at the bottom of the sagger substrate, performing mechanical pressing again, drying, and preserving heat for 3-10 hours at 1330-1400 ℃ to prepare the light sagger for roasting the lithium battery anode material. The sagger is used for synthesizing lithium cobaltate serving as a lithium battery anode material at 1000 ℃, and the sagger is easy to deform and crack when the temperature exceeds 1000 ℃.
After the materials are fired, some saggars are directly broken into two parts, some saggars are cracked, the breakage rate is very high, the production cost is increased, more waste saggars are generated, a large storage space is occupied, and the treatment difficulty is increased. For this reason, those skilled in the art have studied a method of recovering and remanufacturing a sagger from a waste sagger. For example, patent document No. CN106083087A discloses a method for preparing a mullite-based sagger from waste sagger, which adopts mullite and waste sagger as main raw materials, and albite, zircon quartz, nano alumina, fused magnesia, water glass, zirconium silicate, silicon nitride and reinforcing fibers as auxiliary materials, and adopts water quenching, oil immersion and post-treatment processes in the preparation process to improve the physical and chemical properties of the prepared product, and the prepared sagger has good thermal stability, strong pressure resistance, corrosion resistance and is not easy to crack. However, this method cannot fundamentally solve the technical problem of short service life of the sagger, and even if the sagger is recycled, other raw materials still need to be added, so that the sagger is used less frequently and the production cost is still high. Therefore, it is necessary to develop a new process capable of extending the service life of the sagger under high temperature conditions.
The invention has the beneficial effects that:
1. the main raw material of the invention is kyanite tailings, which utilizes waste and saves resources; the kyanite tailings contain part of kyanite, the kyanite is resistant to high temperature and alkali corrosion, and is converted into mullite at high temperature to generate volume expansion, so that the sintering shrinkage of the combined clay can be counteracted, and the high-temperature volume stability of the product is kept.
2. Reasonable grain composition, crushing the kyanite tailings into various granularities, and scientifically matching the granularity, so that the sagger has certain air permeability while ensuring enough strength.
3. The reasonable sintering temperature curve ensures that the kyanite is fully mullite and is converted into acicular mullite, and the produced product has the advantages of high temperature resistance, erosion resistance, stable high-temperature volume and higher high-temperature strength.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention are clearly and completely described below. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention, are within the scope of the invention.
Example 1
A manufacturing process of a series of sagger of kyanite tailings comprises the sagger and a preparation method of the sagger; the sagger is prepared from the following raw materials in percentage by mass: 10% of kyanite tailings with the grain size of 1-2mm, 20% of kyanite tailings with the grain size of 0.1-1mm, 30% of kyanite tailings with the grain size of 0-0.1mm, 39.5% of soft clay and 0.5% of bonding agent. The binder is lignosulfonate. The weight ratio of the raw materials to the water is as follows: water: the raw materials are 1.
The preparation method of the sagger comprises the following steps:
s1: preparing materials: weighing the raw materials in parts by weight according to a proportion, and fully stirring the binding agent and the required total added water in advance to prepare an aqueous solution;
s2: mixing materials: premixing various particles of kyanite tailings in a stirrer uniformly, wherein the rotating speed of the stirrer is 20r/min, adding an aqueous solution with half of the total added water amount after 3 minutes, continuously mixing for 3 minutes, adding soft clay, mixing for 3 minutes, adding the rest half of the aqueous solution, mixing for 5 minutes to obtain a mixture, and then putting the mixture into a mud bin for ageing for 6 hours;
s3: molding: putting the trapped pug into a mold, performing hydraulic forming by a 300t hydraulic press, and brushing a layer of release agent on the mold after brick discharge, wherein the release agent is a self-made release agent and comprises the following components in parts by weight: diesel oil: the talcum powder is 3;
s4: and (3) drying: and (2) putting the formed green bodies into a drying vehicle, naturally drying for 1 day, and then drying in a tunnel drying chamber for 2 days, wherein the drying temperature in the tunnel drying chamber is as follows: the inlet is 40 ℃, the outlet is 80 ℃, and the residual moisture is controlled to be less than 1 percent;
s5: and (3) firing: firing the dried green body in a high-temperature pushed slab kiln, wherein the number of the dried green body is 5, the maximum firing temperature is 1350 ℃, the heat preservation time is 6h, and the heating rate is 40 ℃/h;
s6: and (3) finished product: after the materials are taken out of the kiln, sorting, stacking qualified products, warehousing and packaging.
Example 2
A manufacturing process of a kyanite tailing series sagger comprises the sagger and a preparation method of the sagger; the sagger is prepared from the following raw materials in percentage by mass: 10% of kyanite tailings with the grain size of 1-2mm, 30% of kyanite tailings with the grain size of 0.1-1mm, 30% of kyanite tailings with the grain size of 0-0.1mm, 28% of soft clay and 2% of a bonding agent. The binding agent is dextrin. The weight ratio of the raw materials to the water is as follows: water: the raw materials are 1.
The preparation method of the sagger comprises the following steps:
s1: preparing materials: weighing the raw materials in parts by weight according to a proportion, and fully stirring the binding agent and the required total added water in advance to prepare an aqueous solution;
s2: mixing materials: premixing various particles of kyanite tailings in a stirrer uniformly, wherein the rotating speed of the stirrer is 20r/min, adding an aqueous solution with half of the total added water amount after 3 minutes, continuously mixing for 3 minutes, adding soft clay, mixing for 3 minutes, adding the rest half of the aqueous solution, mixing for 6 minutes to obtain a mixture, and then putting the mixture into a mud bin for ageing for 5 hours;
s3: molding: placing the trapped pug into a mold, performing hydraulic forming by using a 300t hydraulic press, and brushing a layer of release agent on the mold after bricks are discharged, wherein the release agent is a self-made release agent and comprises the following components in parts by weight: diesel oil: the talcum powder is 3;
s4: and (3) drying: and (3) putting the formed green bodies into a drying vehicle, naturally drying for 1 day, and then drying in a tunnel drying chamber for 2 days, wherein the drying temperature in the tunnel drying chamber is as follows: the inlet is 50 ℃, the outlet is 100 ℃, and the residual moisture is controlled to be less than 1 percent;
s5: and (3) firing: firing the dried green body in a high-temperature pushed slab kiln, wherein the number of the dried green body is 5, the maximum firing temperature is 1400 ℃, the heat preservation time is 5h, and the heating rate is 45 ℃/h;
s6: and (3) finished product: after the materials are taken out of the kiln, sorting, stacking qualified products, warehousing and packaging.
Example 3
A manufacturing process of a kyanite tailing series sagger comprises the sagger and a preparation method of the sagger; the sagger is prepared from the following raw materials in percentage by mass: 13.5% of kyanite tailings with the grain size of 1-2mm, 25% of kyanite tailings with the grain size of 0.1-1mm, 20% of kyanite tailings with the grain size of 0-0.1mm, 40% of soft clay and 1.5% of a bonding agent. The binder is lignosulfonate. The weight ratio of the raw materials to the water is as follows: water: the raw materials are 1.
The preparation method of the sagger comprises the following steps:
s1: preparing materials: weighing the raw materials in parts by weight according to a proportion, and fully stirring the binding agent and the required total added water in advance to prepare an aqueous solution;
s2: mixing materials: premixing various particles of kyanite tailings in a stirrer uniformly, wherein the rotating speed of the stirrer is 20r/min, adding an aqueous solution with half of the total added water amount after 3 minutes, continuously mixing for 3 minutes, adding soft clay, mixing for 3 minutes, adding the rest half of the aqueous solution, mixing for 7 minutes to obtain a mixture, and then putting the mixture into a mud bin for ageing for 6 hours;
s3: molding: putting the trapped pug into a mold, performing hydraulic forming by a 300t hydraulic press, and brushing a layer of release agent on the mold after brick discharge, wherein the release agent is a self-made release agent and comprises the following components in parts by weight: diesel oil: the talcum powder is 3;
s4: and (3) drying: and (3) putting the formed green bodies into a drying vehicle, naturally drying for 1 day, and then drying in a tunnel drying chamber for 1.5 days, wherein the drying temperature in the tunnel drying chamber is as follows: the inlet is 45 ℃, the outlet is 90 ℃, and the residual moisture is controlled to be less than 1 percent;
s5: and (3) firing: firing the dried green body in a high-temperature pushed slab kiln, wherein the number of the dried green body is 5, the maximum firing temperature is 1400 ℃, the heat preservation time is 5h, and the heating rate is 45 ℃/h;
s6: and (3) finished product: and (4) after taking out of the kiln, sorting, stacking qualified products, warehousing and packaging.
Example 4
A manufacturing process of a kyanite tailing series sagger comprises the sagger and a preparation method of the sagger; the sagger is prepared from the following raw materials in percentage by mass: 20% of kyanite tailings with the grain size of 1-2mm, 30% of kyanite tailings with the grain size of 0.1-1mm, 28% of kyanite tailings with the grain size of 0-0.1mm, 20% of soft clay and 2% of binding agent. The binding agent is dextrin. The weight ratio of the raw materials to the water is as follows: water: the raw materials are 1.
The preparation method of the sagger comprises the following steps:
s1: preparing materials: weighing the raw materials in parts by weight according to a proportion, and fully stirring the binding agent and the required total added water in advance to prepare an aqueous solution;
s2: mixing materials: premixing various particles of kyanite tailings uniformly in a stirrer at the rotating speed of 20r/min, adding water solution with half of the total added water amount after 3 minutes, continuously mixing for 3 minutes, adding soft clay, mixing for 3 minutes, adding the rest half of water solution, mixing for 8 minutes to obtain a mixture, and putting the mixture into a mud bin for ageing for 4 hours;
s3: molding: placing the trapped pug into a mold, performing hydraulic forming by using a 300t hydraulic press, and brushing a layer of release agent on the mold after bricks are discharged, wherein the release agent is a self-made release agent and comprises the following components in parts by weight: diesel oil: the talcum powder is 3;
s4: and (3) drying: and (2) putting the formed green bodies into a drying vehicle, naturally drying for 1 day, and then drying in a tunnel drying chamber for 1 day, wherein the drying temperature in the tunnel drying chamber is as follows: the inlet is 50 ℃, the outlet is 100 ℃, and the residual moisture is controlled to be less than 1 percent;
s5: and (3) firing: firing the dried green body in a high-temperature pushed slab kiln, wherein the number of the dried green body is 5, the maximum firing temperature is 1350 ℃, the heat preservation time is 6h, and the heating rate is 50 ℃/h;
s6: and (3) finished product: and (4) after taking out of the kiln, sorting, stacking qualified products, warehousing and packaging.
Example 5
A manufacturing process of a kyanite tailing series sagger comprises the sagger and a preparation method of the sagger; the sagger is prepared from the following raw materials in percentage by mass: 25% of kyanite tailings with the grain size of 1-2mm, 25% of kyanite tailings with the grain size of 0.1-1mm, 25% of kyanite tailings with the grain size of 0-0.1mm, 24% of soft clay and 1% of bonding agent. The binding agent is dextrin. The weight ratio of the raw materials to the water is as follows: water: the raw materials are 1.
The preparation method of the sagger comprises the following steps:
s1: preparing materials: weighing the raw materials in parts by weight according to a proportion, and fully stirring the binding agent and the required total added water in advance to prepare an aqueous solution;
s2: mixing materials: premixing various particles of kyanite tailings in a stirrer uniformly, wherein the rotation speed of the stirrer is 20r/min, adding a half of water solution after 3 minutes, continuously mixing for 3 minutes, adding soft clay, mixing for 3 minutes, adding the remaining half of water solution, mixing for 9 minutes to obtain a mixture, and then putting the mixture into a mud bin for ageing for 4 hours;
s3: molding: placing the trapped pug into a mold, performing hydraulic forming by using a 300t hydraulic press, and brushing a layer of release agent on the mold after bricks are discharged, wherein the release agent is a self-made release agent and comprises the following components in parts by weight: diesel oil: the talcum powder is 3;
s4: and (3) drying: and (2) putting the formed green bodies into a drying vehicle, naturally drying for 1 day, and then drying in a tunnel drying chamber for 2 days, wherein the drying temperature in the tunnel drying chamber is as follows: the inlet is 40 ℃, the outlet is 90 ℃, and the residual moisture is controlled to be less than 1 percent;
s5: and (3) firing: firing the dried green body in a high-temperature pushed slab kiln, flatly installing the dried green body for 5 times, wherein the highest firing temperature is 1450 ℃, the heat preservation time is 4h, and the heating rate is 40 ℃/h;
s6: and (3) finished product: and (4) after taking out of the kiln, sorting, stacking qualified products, warehousing and packaging.
Example 6
A manufacturing process of a series of sagger of kyanite tailings comprises the sagger and a preparation method of the sagger; the sagger is prepared from the following raw materials in percentage by mass: 30% of kyanite tailings with the grain size of 1-2mm, 29% of kyanite tailings with the grain size of 0.1-1mm, 10% of kyanite tailings with the grain size of 0-0.1mm, 30% of soft clay and 1% of binding agent. The binder is lignosulfonate. The weight ratio of the raw materials to the water is as follows: water: the raw materials are 1.
The preparation method of the sagger comprises the following steps:
s1: preparing materials: weighing the raw materials in parts by weight according to a proportion, and fully stirring the binding agent and the required total added water in advance to prepare an aqueous solution;
s2: mixing materials: premixing various particles of kyanite tailings in a stirrer uniformly, wherein the rotation speed of the stirrer is 20r/min, adding a half of water solution after 3 minutes, continuously mixing for 3 minutes, adding soft clay, mixing for 3 minutes, adding the rest half of water solution, mixing for 10 minutes to obtain a mixture, and then putting the mixture into a mud bin for ageing for 6 hours;
s3: molding: putting the trapped pug into a mold, performing hydraulic forming by a 200t hydraulic press, and brushing a layer of release agent on the mold after brick discharge, wherein the release agent is a self-made release agent and comprises the following components in parts by weight: diesel oil: the talcum powder is 3;
s4: and (3) drying: and (3) putting the formed green bodies into a drying vehicle, naturally drying for 1 day, and then drying in a tunnel drying chamber for 2 days, wherein the drying temperature in the tunnel drying chamber is as follows: the inlet is 40 ℃, the outlet is 80 ℃, and the residual moisture is controlled to be less than 1 percent;
s5: and (3) firing: firing the dried green body in a high-temperature pushed slab kiln, wherein the number of the dried green body is 5, the maximum firing temperature is 1350 ℃, the heat preservation time is 6h, and the heating rate is 40 ℃/h;
s6: and (3) finished product: and (4) after taking out of the kiln, sorting, stacking qualified products, warehousing and packaging.
In examples 1-6 herein, the sagger was used to load alumina and additives needed to calcine alumina.
The kyanite has the characteristics of high temperature resistance, erosion resistance, irreversible thermal expansion and the like, can effectively improve the performance of the traditional product as a main raw material for manufacturing the saggar, improves the internal quality of the product, increases the use times, and selects kyanite tailings to replace hard clay raw materials. All the raw materials are stirred and mixed step by step at room temperature to achieve excellent mixing effect. After the bricks are taken out, a layer of release agent is brushed on the model to prevent the mould from sticking and ensure the smooth and compact surface of the semi-finished product. The sagger prepared in the embodiment 1-6 is used for calcining alumina, the calcining temperature is 1400-1500 ℃, the using times can reach 5-6 times, and the service life is doubled.
Finally, the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and other modifications or equivalent substitutions made by the technical solutions of the present invention by those of ordinary skill in the art should be covered within the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solutions of the present invention.
Claims (3)
1. A manufacturing process of a series of sagger of kyanite tailings is characterized by comprising the following steps: comprises a sagger and a preparation method of the sagger; the sagger is prepared from the following raw materials: 58.5-78% of kyanite tailings, 20-40% of soft clay and 0.5-2% of bonding agent; wherein, the kyanite tailings with the grain diameter of 1-2mm account for 10-30 percent, the kyanite tailings with the grain diameter of 0.1-1mm account for 20-30 percent and the kyanite tailings with the grain diameter of 0-0.1mm account for 10-30 percent;
the binding agent is lignosulfonate or dextrin;
the preparation method of the sagger comprises the following steps:
s1: preparing materials: weighing the raw materials in parts by weight according to a proportion, and fully stirring the binding agent and the required total added water in advance to prepare an aqueous solution; the weight ratio of the raw materials to the water is as follows: water: the raw materials are 1;
s2: mixing materials: premixing various particles of kyanite tailings in a stirrer uniformly, adding an aqueous solution with half of the total added water amount after 3 minutes, continuously mixing for 3 minutes, adding soft clay, mixing for 3 minutes, adding the remaining half of the aqueous solution, mixing for 5-10 minutes to obtain a mixture, and putting the mixture into a mud bin to be aged for more than or equal to 4 hours;
s3: molding: placing the trapped pug into a mold, performing hydraulic forming by using a hydraulic press, and brushing a layer of release agent on the mold after bricks are discharged, wherein the release agent is a self-made release agent and comprises the following components in parts by weight: diesel oil: the talcum powder is 3;
s4: and (3) drying: placing the molded green body into a drying vehicle, naturally drying for 1 day, and then drying in a tunnel drying chamber for 1-2 days;
s5: and (3) firing: firing the dried green body in a high-temperature pushed slab kiln, wherein the maximum firing temperature is 1350-1450 ℃, the heating rate is 40-50 ℃/h, and the heat preservation time is 4-6h;
s6: and (3) finished product: after the materials are taken out of the kiln, sorting, stacking qualified products, warehousing and packaging;
the sagger is used for loading alumina and additives required by calcined alumina, and the temperature of the calcined alumina is 1400-1500 ℃.
2. The manufacturing process of the kyanite tailing series sagger of claim 1, characterized in that: in the sagger preparation method, in the step S1, the rotating speed of the stirrer is 20r/min.
3. The manufacturing process of the kyanite tailing series sagger as claimed in claim 2, wherein the manufacturing process comprises the following steps: in the preparation method of the sagger, in the step S4, the residual moisture is controlled to be less than 1%.
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