CN106431174B - Preparation method of granular powder for magnesite product molding - Google Patents
Preparation method of granular powder for magnesite product molding Download PDFInfo
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- CN106431174B CN106431174B CN201610844456.5A CN201610844456A CN106431174B CN 106431174 B CN106431174 B CN 106431174B CN 201610844456 A CN201610844456 A CN 201610844456A CN 106431174 B CN106431174 B CN 106431174B
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- 239000001095 magnesium carbonate Substances 0.000 title claims abstract description 108
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 title claims abstract description 108
- 229910000021 magnesium carbonate Inorganic materials 0.000 title claims abstract description 108
- 235000014380 magnesium carbonate Nutrition 0.000 title claims abstract description 108
- 239000000843 powder Substances 0.000 title claims abstract description 91
- 238000000465 moulding Methods 0.000 title claims abstract description 39
- 238000002360 preparation method Methods 0.000 title claims abstract description 24
- 239000000463 material Substances 0.000 claims abstract description 135
- 238000000034 method Methods 0.000 claims abstract description 60
- 239000002002 slurry Substances 0.000 claims abstract description 55
- 238000005469 granulation Methods 0.000 claims abstract description 21
- 230000003179 granulation Effects 0.000 claims abstract description 21
- 239000002994 raw material Substances 0.000 claims abstract description 20
- 238000012216 screening Methods 0.000 claims abstract description 11
- 239000003086 colorant Substances 0.000 claims abstract description 4
- 238000002156 mixing Methods 0.000 claims abstract description 4
- 238000009826 distribution Methods 0.000 claims description 24
- 239000003795 chemical substances by application Substances 0.000 claims description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 239000000919 ceramic Substances 0.000 claims description 16
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims description 14
- 239000000243 solution Substances 0.000 claims description 13
- 238000005498 polishing Methods 0.000 claims description 12
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 claims description 10
- 239000002699 waste material Substances 0.000 claims description 10
- 239000000395 magnesium oxide Substances 0.000 claims description 9
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 9
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 230000002940 repellent Effects 0.000 claims description 9
- 239000005871 repellent Substances 0.000 claims description 9
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 8
- 239000010453 quartz Substances 0.000 claims description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 8
- 239000002518 antifoaming agent Substances 0.000 claims description 7
- 239000000945 filler Substances 0.000 claims description 7
- 229910001629 magnesium chloride Inorganic materials 0.000 claims description 7
- 238000005507 spraying Methods 0.000 claims description 7
- 239000007864 aqueous solution Substances 0.000 claims description 6
- 159000000003 magnesium salts Chemical class 0.000 claims description 6
- 239000003607 modifier Substances 0.000 claims description 6
- 239000004575 stone Substances 0.000 claims description 6
- 229910052943 magnesium sulfate Inorganic materials 0.000 claims description 5
- 235000019341 magnesium sulphate Nutrition 0.000 claims description 5
- 239000012783 reinforcing fiber Substances 0.000 claims description 3
- 239000011863 silicon-based powder Substances 0.000 claims description 2
- 238000007493 shaping process Methods 0.000 claims 4
- 238000003825 pressing Methods 0.000 abstract description 14
- 239000004744 fabric Substances 0.000 abstract description 4
- 239000000049 pigment Substances 0.000 abstract description 3
- 239000011449 brick Substances 0.000 description 27
- 238000001035 drying Methods 0.000 description 27
- 238000010438 heat treatment Methods 0.000 description 13
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 12
- 238000010521 absorption reaction Methods 0.000 description 8
- 238000000227 grinding Methods 0.000 description 8
- 230000035484 reaction time Effects 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 6
- 238000013461 design Methods 0.000 description 6
- 229910052710 silicon Inorganic materials 0.000 description 6
- 239000010703 silicon Substances 0.000 description 6
- 238000007873 sieving Methods 0.000 description 5
- 238000003756 stirring Methods 0.000 description 5
- 238000005034 decoration Methods 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 239000002585 base Substances 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000001746 injection moulding Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 238000004381 surface treatment Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 241000692870 Inachis io Species 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000001055 blue pigment Substances 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 239000000109 continuous material Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000004401 flow injection analysis Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 239000001023 inorganic pigment Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 239000001053 orange pigment Substances 0.000 description 1
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 229910021487 silica fume Inorganic materials 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000013053 water resistant agent Substances 0.000 description 1
- 230000002087 whitening effect Effects 0.000 description 1
- 229910001928 zirconium oxide Inorganic materials 0.000 description 1
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/30—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing magnesium cements or similar cements
- C04B28/32—Magnesium oxychloride cements, e.g. Sorel cement
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Abstract
The invention provides a preparation method of granular powder for magnesite product molding, which comprises the following steps: step 1) material preparation: uniformly mixing raw materials for preparing the magnesite material to prepare slurry for later use; step 2) precuring: primarily curing the slurry obtained in the step 1) to form an initial curing material; step 3) granulation: crushing and screening the initial-stage curing material obtained in the step 2) to obtain the granular powder for molding. In the prior art, the magnesite products are molded by a slurry flow forming method, the magnesite slurry is prefabricated into granular powder, the granular powder can be molded by dry pressing, the compactness and the strength of the prepared board are improved, the powder can be prepared into texture materials with various colors by adding different pigments, preset texture cloth is realized, and the uncontrollable characteristic of the traditional slurry flow forming texture is changed.
Description
Technical Field
The invention relates to the field of inorganic materials, in particular to a preparation method of granular powder for magnesite product molding.
Background
The magnesite material, namely magnesite cement, belongs to a pure inorganic bonding material, has the excellent performances of environmental protection, no toxicity, no radiation, fire resistance, aging resistance, acid and alkali resistance and the like, is easy to realize special-shaped modeling, is cured at low temperature, does not need high-temperature sintering, and is widely applied to preparation of environment-friendly building materials.
However, the magnesite products in the market at present are all prepared by adopting methods of slurry injection molding, rolling, extruding and the like, but the existing slurry injection molding method is limited by the flowability of slurry, the preparation process is single, and the change design of patterns, patterns and colors of the magnesite products is difficult to realize, so that the diversity of the patterns and textures of the magnesite products is often limited, the controllability of the textures of the prepared products is not high, the quality fluctuation of the magnesite products is large, the prepared magnesite products have the problems of low volume density, non-uniform hardness, low folding strength and large water absorption rate, and the requirements of consumers for the magnesite products cannot be met.
Disclosure of Invention
The invention aims to provide a preparation method of granular powder for magnesite product molding, the granular powder prepared by the method is suitable for dry pressing molding, the strength and the density of the product are improved, meanwhile, the granular powder prepared by the method can be used for dry continuous material distribution, and the texture change of the material distribution is rich and controllable.
In order to achieve the purpose, the invention adopts the following technical scheme:
a preparation method of granular powder for magnesite product molding comprises the following steps:
step 1) material preparation: uniformly mixing raw materials for preparing the magnesite material to prepare slurry for later use;
step 2) curing: primarily curing the slurry obtained in the step 1) to form an initial curing material;
step 3) granulation: crushing and screening the initial-stage curing material obtained in the step 2) to obtain the granular powder for molding.
In the prior art, the magnesite boards/bricks are all formed by slurry flowing in a mould, the boards/bricks prepared by the method have low strength, and for products with texture decoration effects, the textures become fuzzy and uncontrollable in the slurry flowing process. The scheme of the invention firstly provides that the magnesite material is solidified and then crushed into powder. The powder can be made into magnesite boards/bricks in a powder distribution punch forming mode, the strength of the magnesite boards/bricks is higher than that of a traditional slurry flow forming mode, and the textures of products subjected to texture decoration can be controlled in a preset mode.
Preferably, in the method, the curing time for primarily curing the slurry obtained in the step 1) in the step 2) is 30min to 180 min. In the scheme, the strength of the raw materials for preparing the magnesite material is approximately improved along with the time in the curing process after the raw materials are added with water to prepare the slurry, and in the scheme, the slurry is cured in the step 2) within a certain preferable time range, the slurry is too short and not cured to form the strength, and the slurry is too long, so that the later strength of the product is formed, the granulation treatment in the step 3) is not facilitated, and the strength of the magnesite material product formed by stamping and forming the powder is also influenced, therefore, the curing time is set to be 30-180 min as the preferable range, and more preferably, the curing time is 60-120 min.
Preferably, in the method, in the step 2), the slurry obtained in the step 1) is primarily cured under the conditions of constant temperature and constant humidity, the temperature is 30-80 ℃, and the humidity is 40-90%. The slurry curing is facilitated under the conditions of constant temperature and constant humidity, a reaction container with the functions of constant temperature and constant humidity is generally used in the actual use process, in order to maintain the temperature, the reaction container generally needs to be heated, and the heating mode can be selected from various modes, such as traditional thermocouple heating, hot air heating, microwave heating and the like.
Preferably, in the above method, the moisture content of the initial curing material in the step 2) is controlled to be 5% to 15%. Too high moisture content, difficult to crush, and failure to develop initial strength; when the moisture content is too low, the strength is high, the material is difficult to break, and the strength of a later-stage press-formed product is not utilized.
Preferably, in the above method, the step of spraying color paste and/or spraying toner to the initial solidified material is further included in the granulation process in the step 3), and in this way, the magnesite material granule powder with color can be obtained. The magnesite board/brick with rich decorative effect can be obtained by using the granular powder with color.
Preferably, in the above method, the granulation process of step 3) is performed before the initial solidified material of step 2) has formed the final strength.
Preferably, in the above method, the raw materials for preparing the magnesite material in step 1) comprise the following components in parts by mass: 100 parts of magnesium oxide, 80-130 parts of magnesium salt aqueous solution, 90-150 parts of filler and 1-50 parts of modifier. It should be noted that the object of the present invention can be achieved by conventional magnesite materials, and the raw materials with the above ratio have higher strength than the conventional magnesite materials, and have long curing time, so that the step 3) granulation can be performed for a longer time. This is because the process flexibility can be increased during the actual production process, allowing a wider range of cure times.
Preferably, in the method, the magnesium salt aqueous solution is a magnesium chloride solution with a Baume degree of 22-30 and/or a magnesium sulfate solution with a concentration of 10-30%.
Preferably, in the above method, the filler is one or more of stone powder, quartz powder, silica fume, ceramic polishing waste and reinforcing fiber.
Preferably, in the above method, the modifier is one or more of a water repellent agent, an interfacial agent and a defoaming agent in combination.
The invention has the beneficial effects that: the invention breaks through the traditional slurry flow forming process for preparing the magnesite material, provides the method for carrying out primary curing treatment on the magnesite slurry and carrying out granulation on the basis of not influencing the magnesite raw material to obtain the magnesite material particle powder. The process is different from the existing magnesite material production process, the powder prepared by the process has good fluidity, is suitable for punch forming, has high product strength, effectively overcomes the defect that a pulp flow injection mold is not easy to design the pattern texture of the magnesite material, realizes the conversion of the preparation process of the magnesite material from liquid state to solid state, realizes dry-method material distribution, does not need slurry defoaming, is more convenient for material distribution, can also carry out more pattern texture design through the dry-method molding powder, provides a technical basis for the diversification of the texture of the magnesite product, greatly improves the decoration diversity of the magnesite material, enriches the texture, the design color and the like, and obviously increases the folding strength of the prepared magnesite material.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments.
A preparation method of granular powder for magnesite product molding comprises the following steps:
step 1) material preparation: uniformly mixing raw materials for preparing the magnesite material to prepare slurry for later use;
step 2) curing: primarily curing the slurry obtained in the step 1) to form an initial curing material;
step 3) granulation: crushing and screening the initial curing material obtained in the step 2) to obtain the magnesite material granular powder for molding.
The invention provides a method for preparing magnesite material particle powder, which comprises the steps of firstly carrying out primary curing treatment on slurry prepared from magnesite raw materials to form an initial curing material. Here, the primary curing apparatus is a primary curing mold that can shape the slurry; the initial solidified material is a gelled solid substance with certain strength, and when the initial solidified material is not completely reacted, namely before the final strength of the initial solidified material is formed, the initial solidified material is crushed, granulated and screened to obtain the magnesite material granular powder. The moisture of the initial curing material in the step 2) is controlled to be 5-15 percent. If the moisture content is too high, the sheet cannot be broken and cannot have initial strength, while if the moisture content is too low, the sheet has high strength and is difficult to break, and the strength of the press-molded article in the later stage is not utilized.
Compared with the prior art, the invention breaks through the traditional slurry flow forming process for preparing the magnesite material, and provides the steps of carrying out primary curing treatment on the magnesite slurry and carrying out granulation on the magnesite raw material without influencing the magnesite raw material to obtain powder. The preparation process is simple, the prepared powder has good fluidity and can be used for dry-process cloth forming, so that a product prepared by using the powder has higher strength, the defect that a pulp injection mold is not easy to design pattern textures of a magnesite material is effectively overcome, the preparation process of the magnesite material is changed from liquid to solid, the dry-process cloth is realized, slurry defoaming is not needed, the cloth is more convenient, more pattern textures can be designed by the dry-process forming powder, a technical basis is provided for diversification of the textures of the magnesite product, the decoration diversity of the magnesite material is greatly improved, the textures, the patterns and the like are enriched, and the breaking strength of the prepared magnesite material is obviously improved.
Further, the reaction time of the primary curing treatment in the step (2) is 30min to 180 min. In order to avoid that the slurry is completely reacted in the primary curing equipment to form final strength, so that the properties such as internal strength and the like are damaged in subsequent crushing and granulation, and the difficulty of crushing and granulation is increased, the reaction time of primary curing treatment is not too long, and the reaction time is kept within the range of 30-180 min to ensure the strength property of the prepared dry-process molding powder.
Further, the preliminary curing treatment in the step (2) is constant-temperature and constant-humidity preliminary curing treatment, the heating mode of the preliminary curing treatment can be any one of microwave constant-temperature heating, hot-air constant-temperature heating or thermocouple constant-temperature heating, the temperature of the preliminary curing treatment is 30-80 ℃, and the humidity is 40-90%. In the primary curing treatment stage, the constant-temperature and constant-humidity primary curing treatment can be carried out according to the temperature and humidity of the reaction environment, so that certain reaction temperature and humidity are ensured, and the primary curing treatment is promoted.
Further, in the process of crushing and granulating the initial solidified material, the obtained dry-formed powder can be sprayed with a pre-prepared color paste or toner. During crushing and granulation, different color pastes or toners are sprayed to increase the color of the dry-process molding powder, so that the color diversity of the dry-process molding powder is improved, the dry-process molding powder is favorable for performing ceramic-like distribution according to the color and the texture so as to design the texture pattern of the magnesite material, and the fluidity of the dry-process molding powder is improved; the adopted color paste can ensure that the surface of the dry-process molding powder is more uniformly colored, the adhesiveness is higher, the waste caused by the fact that pigment falls off from the surface of the dry-process molding powder and adheres to the inner wall of equipment during discharging is avoided, and the phenomenon that the dry-process molding powder falls off and is layered when the magnesite material is prepared by compression molding can be avoided, so that the quality of the magnesite material is influenced.
In addition, in the process of crushing and granulating, the obtained particles are different in size, so that the dry forming powder is preferably subjected to coarse crushing, intermediate crushing and fine crushing to reach the proper particle size, and is sieved by a sieve with 18-25 meshes to obtain the dry forming powder with uniform size, so that the quality of the output dry forming powder meets the requirement of granulating, and the quality of the dry forming powder is improved.
Further explaining, the slurry in the step (1) comprises the following components in parts by mass: 100 parts of magnesium oxide, 80-130 parts of magnesium salt aqueous solution, 90-150 parts of filler and 1-50 parts of modifier. It should be noted that the conventional magnesite cement materials can be used to realize the present invention, and the formulation components given above have higher strength and longer curing time than the conventional magnesite materials, so that the granulation in step 3) can be performed for a longer time. This is because the process flexibility can be increased during the actual production process, allowing a wider range of cure times. The magnesite cementing material prepared by the slurry proportion has better compression resistance, corrosion resistance and wear resistance, the magnesite material formed by pressing the dry-process molding powder prepared finally has higher breaking strength, the breaking strength of the board prepared by using the raw material components in the proportion by using a pulp flowing process is 16.5MPa, the breaking strength of the pressing process is greatly improved and is basically more than or equal to 18.2MPa, the volume density is higher, and the water absorption is reduced.
Further, the magnesium salt aqueous solution is a magnesium chloride solution having a Baume degree of 22 to 30 and/or a magnesium sulfate solution having a concentration of 10 to 30% (mass concentration).
Further, the filler comprises one or more of stone powder, quartz powder, ceramic polishing waste residue, micro silicon powder and reinforcing fiber.
The material or similar material is used as filler, so that the strength of the magnesite cementing material can be improved, and the preparation cost is lower.
Further, the modifier comprises one or more of water repellent agent, interfacial agent and defoaming agent. The water-resistant agent can improve the water resistance of the magnesite cementing material and can improve the surface moisture absorption resistance of the magnesite cementing material in a humid environment; the interface agent can improve the acid and alkali resistance and weather resistance of the magnesite cementing material, and the defoaming agent can reduce bubbles and air holes in the magnesite cementing material and improve the compactness and strength. The above materials are all commercially available.
Example 1-a method for preparing a magnesite brick blank, comprising the steps of:
(1) preparing materials: selecting magnesite raw materials comprising 100 parts of magnesium oxide, 80 parts of magnesium chloride solution with 26 baume degrees, 50 parts of quartz powder, 40 parts of ceramic polishing waste residues, 0.5 part of phosphoric acid and 3 parts of silicon micropowder, adding 10 parts of water repellent agent and 5 parts of interface agent for preparation, and uniformly stirring to obtain slurry;
(2) and (3) slurry injection molding: injecting the prepared slurry into a primary curing mold for a solidification reaction to form a blocky brick body;
(3) rolling: rolling the block brick body prepared in the step (3) to obtain a magnesite brick blank, and testing the flexural strength of the magnesite brick blank, wherein the flexural strength is 16.5Mpa, and the bulk density is 1.96g/cm3The water absorption was 6.4%.
Comparative example 1-a process for the preparation of magnesite green bricks comprising the steps of:
(1) preparing materials: selecting magnesite raw materials comprising 100 parts of magnesium oxide, 80 parts of magnesium chloride solution with 26 baume degrees, 50 parts of quartz powder, 40 parts of ceramic polishing waste residues, 0.5 part of phosphoric acid and 3 parts of silicon micropowder, adding 10 parts of water repellent agent and 5 parts of interface agent for preparation, and uniformly stirring to obtain slurry;
(2) primary curing: injecting the slurry prepared in the step (1) into a container, putting the container into a constant-temperature constant-humidity primary curing mold, and performing constant-temperature constant-humidity primary curing treatment, wherein the reaction time of the constant-temperature constant-humidity primary curing treatment is 30min, the heating temperature of the constant-temperature constant-humidity primary curing treatment is 45 ℃, and the humidity of the constant-temperature constant-humidity primary curing treatment is 70%, so that an initial curing material is formed, and the moisture of the initial curing material is 7-12%;
(3) and (3) granulation: putting the initial-stage solidified material obtained in the step (2) into grinding granulation equipment for crushing granulation, sequentially performing coarse crushing, intermediate crushing and fine crushing processes for crushing and screening, and sieving by using a 18-mesh sieve to obtain dry-process molded powder;
(4) material distribution: injecting the dry-method molding powder obtained in the step (3) into a known press material distribution system of the imitation architectural ceramic tile, and performing texture material distribution on a molding die according to a preset requirement in a multi-tube material distribution mode;
(5) and (3) pressing and forming: conveying the forming die with the distributed material to a forming station, vacuumizing and vibrating to form, wherein the vacuum degree of vacuumizing is-0.01 MPa, the vacuumizing time is 30s, and the vibration frequency is 50HZ, so as to obtain a magnesite brick blank, and testing the flexural strength of the magnesite brick blank, wherein the flexural strength is 18.2MPa, and the volume density is 2.08g/cm3Water absorption rateThe content was found to be 3.2%.
Therefore, comparing the magnesite brick blanks prepared in the embodiment 1 and the comparative embodiment 1, the quality of the magnesite brick blanks prepared by different preparation processes is obviously different, as shown in the following table, it can be known from the table that the magnesite brick blanks prepared by the method for preparing dry-process molding powder provided by the invention and pressing the dry-process molding powder have the advantages of increased flexural strength, increased volume density and reduced water absorption, and the overall quality of the magnesite brick blanks is effectively improved.
| Technological process | Product breaking strength (MPa) | Bulk Density (g/cm)3) | Water absorption (%) |
| Pulp flow process | 16.5 | 1.96 | 6.4 |
| Pressing process | 18.2 | 2.08 | 3.2 |
Comparative example 2-a process for the preparation of magnesite green bricks comprising the steps of:
(1) preparing materials: selecting magnesite raw materials comprising 100 parts of magnesium oxide, 80 parts of magnesium chloride solution with 26 baume degrees, 50 parts of quartz powder, 40 parts of ceramic polishing waste residues, 0.5 part of phosphoric acid and 3 parts of silicon micropowder, adding 10 parts of water repellent agent and 5 parts of interface agent for preparation, and uniformly stirring to obtain slurry;
(2) primary curing: injecting the slurry prepared in the step (1) into a container, putting the slurry into a constant-temperature constant-humidity primary curing mold, and performing constant-temperature constant-humidity primary curing treatment, wherein the reaction time of the constant-temperature constant-humidity primary curing treatment is 30min, the heating temperature of the constant-temperature constant-humidity primary curing treatment is 45 ℃, and the humidity of the constant-temperature constant-humidity primary curing treatment is 70%, so as to form an initial curing material;
(3) and (3) granulation: putting the initial-stage solidified material in the step (2) into grinding and granulating equipment for crushing and granulating, sequentially carrying out coarse crushing, intermediate crushing and fine crushing procedures for crushing and screening, and when carrying out the fine crushing procedure, respectively spraying blue color paste and white color paste (the color paste is composed of known pigment, preferably inorganic pigment, for example, the blue color paste can be made of peacock blue pigment, the white color paste can be made of whitening material containing zirconium silicate or zirconium oxide) into the dry-process formed powder, sieving by using a sieve of 18 meshes to respectively obtain blue and white dry-process formed powder as texture materials, and taking the rest crushed conventional dry-process formed powder as a base material;
(4) material distribution: injecting the dry-method molding powder obtained in the step (3) into a known press material distribution system of the imitation architectural ceramic tile, and distributing textures on a molding die according to a preset requirement in a multi-tube material distribution mode, wherein the textures are embedded in the bottom material and on the surface of the bottom material;
(5) and (3) pressing and forming: conveying the forming die with the distributed material to a forming station, vacuumizing, vibrating and pressing to form, wherein the vacuum degree of vacuumizing is-0.01 MPa, the vacuumizing time is 30s, and the vacuum degree is 50HZVibrating at a frequency to obtain magnesite brick blank, and testing the flexural strength of the magnesite brick blank, wherein the flexural strength is 19.6Mpa, and the bulk density is 2.14g/cm3The water absorption was 3.1%.
Comparing the comparative example 2 with the comparative example 1, when the fine crushing process is performed in the comparative example 2, the blue color paste and the white color paste are sprayed into the dry forming powder, the texture material and the base material are obtained, and the texture material is distributed, so that the finally prepared dry forming powder has increased fluidity compared with the dry forming powder obtained in the comparative example 1, the dry forming powder is uniformly colored, the magnesite brick blank formed by pressing is more uniform in texture, the breaking strength is increased, and the texture is richer.
Embodiment 2-a method for preparing a magnesite board having a cloud-like texture, comprising the steps of:
(1) preparing materials: selecting magnesite raw materials of 100 parts of magnesium oxide, 110 parts of magnesium chloride solution with Baume degree of 26, 50 parts of stone powder, 40 parts of ceramic polishing waste residue, 0.5 part of phosphoric acid and 3 parts of silicon micropowder, adding 10 parts of water repellent agent, 5 parts of interfacial agent and 5 parts of defoaming agent, preparing, and uniformly stirring to obtain slurry;
(2) primary curing: injecting the slurry prepared in the step (1) into a container, allowing the slurry to enter a constant-temperature constant-humidity primary curing mold, and performing constant-temperature constant-humidity primary curing treatment, wherein the reaction time of the constant-temperature constant-humidity primary curing treatment is 105min, the heating temperature of the constant-temperature constant-humidity primary curing treatment is 60 ℃, the humidity of the constant-temperature constant-humidity primary curing treatment is 90%, so that an initial curing material is formed, and the moisture of the initial curing material is 5-10%;
(3) and (3) granulation: putting the initial-stage cured material in the step (2) into grinding and granulating equipment for crushing and granulating, sequentially performing coarse crushing, intermediate crushing and fine crushing procedures for crushing and screening, and when the fine crushing procedure is performed, respectively spraying yellow color paste and blue color paste (the yellow color paste uses a known ceramic orange pigment) into the dry-process molded powder, and finally sieving by a 20-mesh sieve to obtain yellow and blue dry-process molded powder as texture materials, and taking the rest crushed conventional dry-process molded powder as a bottom material;
(4) material distribution: injecting the dry-method molding powder obtained in the step (3) into a known press material distribution system of the imitation architectural ceramic tile, and distributing textures on a molding die according to a preset requirement in a roller material distribution manner, wherein the textures are embedded in the surface, the interior and the bottom of the backing material;
(5) and (3) pressing and forming: conveying the forming die with the distributed materials to a forming station, vacuumizing, and vibrating and pressing to form, wherein the vacuumizing degree is-0.02 MPa, the vacuumizing time is 100s, and the vibration frequency is 90HZ, so that a magnesite brick blank with cloud-shaped textures is obtained;
(6) and (5) maintenance: curing the magnesite brick blank obtained in the step (5), wherein the autoclave curing is carried out firstly, and then the constant-temperature constant-humidity curing is carried out, the autoclave curing temperature is 175 ℃, the pressure is 0.5MPa, and the autoclave curing time is 10 hours; the constant temperature and humidity curing temperature is 45 ℃ and the humidity is 70%, and a finished magnesite board product with cloud-shaped textures is obtained;
(7) processing treatment: and (4) performing thickness setting, grinding and polishing, surface treatment and cutting on the magnesite board finished product obtained in the step (6).
Embodiment 3-a method for preparing a magnesite board having a flocculent texture, comprising the steps of:
(1) preparing materials: the magnesite raw materials are selected from 100 parts of magnesium oxide, 95 parts of magnesium sulfate solution with the concentration of 30%, 20 parts of quartz powder, 25 parts of stone powder, 40 parts of ceramic polishing waste residue, 0.5 part of phosphoric acid and 3 parts of silicon micropowder, 15 parts of water repellent agent, 10 parts of interface agent and 5 parts of defoaming agent, and are uniformly stirred to prepare slurry;
(2) primary curing: injecting the slurry prepared in the step (1) into a container, putting the container into a constant-temperature constant-humidity primary curing mold, and performing constant-temperature constant-humidity primary curing treatment, wherein the reaction time of the constant-temperature constant-humidity primary curing treatment is 120min, the heating temperature of the constant-temperature constant-humidity primary curing treatment is 30 ℃, and the humidity of the constant-temperature constant-humidity primary curing treatment is 50%, so as to form an initial curing material;
(3) and (3) granulation: putting the initial-stage solidified material in the step (2) into grinding and granulating equipment for crushing and granulating, sequentially performing coarse crushing, intermediate crushing and fine crushing processes for crushing and screening, and when the fine crushing process is performed, respectively spraying green toner and white toner into the dry-process molding powder, and sieving the powder by a 22-mesh sieve to obtain green and white dry-process molding powder as texture materials, and taking the rest crushed conventional dry-process molding powder as a base material;
(4) material distribution: injecting the dry-method molding powder obtained in the step (3) into a known press material distribution system of the imitation architectural ceramic tile, and distributing texture materials on a molding die according to a preset requirement in a grid material distribution mode, wherein the texture materials are embedded in the surface, the interior and the bottom surface of the backing material; the preset material distribution mode is a well-known technology in the field of architectural ceramics, the texture material forms texture on the surface/in the bottom material, and then the grid is utilized to keep the texture effect;
(5) and (3) pressing and forming: conveying the forming die with the distributed materials to a forming station, vacuumizing, and vibrating to form, wherein the vacuumizing degree is-0.04 MPa, the vacuumizing time is 100s, and the vibration frequency is 90HZ, so that a magnesite brick blank with flocculent textures is obtained;
(6) and (5) maintenance: curing the magnesite brick blank obtained in the step (5), wherein the autoclave curing is carried out firstly, and then the constant-temperature constant-humidity curing is carried out, the autoclave curing temperature is 150 ℃, the pressure is 1.0MPa, and the autoclave curing time is 20 hours; the constant temperature and humidity curing temperature is 60 ℃, and the humidity is 90%, so that a magnesite board finished product with flocculent textures is obtained;
(7) processing treatment: and (4) performing thickness setting, grinding and polishing, surface treatment and cutting on the magnesite board finished product obtained in the step (6).
In this way, the prepared texture can be preset, and the texture boundary is clear. The traditional pulp flow forming mode can also use magnesite material slurry with various colors for forming, but is limited to pulp flow forming, patterns can be formed, the patterns cannot be preset, the pattern boundary can be blurred in the flowing process of the slurry, the preset patterns cannot be formed, and only some random and messy textures can be formed.
Example 4-a method for preparing a magnesite board having a feathered texture, comprising the steps of:
(1) preparing materials: selecting magnesite raw materials comprising 100 parts of magnesium oxide, 130 parts of magnesium sulfate solution with the concentration of 15%, 10 parts of quartz powder, 35 parts of stone powder, 50 parts of ceramic polishing waste residues, 0.5 part of phosphoric acid and 3 parts of silicon micropowder, adding 10 parts of water repellent agent, 15 parts of interfacial agent and 10 parts of defoaming agent, preparing, and uniformly stirring to obtain slurry;
(2) primary curing: injecting the slurry prepared in the step (1) into a container, putting the slurry into a constant-temperature constant-humidity primary curing mold, and performing constant-temperature constant-humidity primary curing treatment, wherein the reaction time of the constant-temperature constant-humidity primary curing treatment is 180min, the heating temperature of the constant-temperature constant-humidity primary curing treatment is 40 ℃, and the humidity of the constant-temperature constant-humidity primary curing treatment is 60%, so as to form an initial curing material;
(3) and (3) granulation: putting the initial-stage solidified material in the step (2) into a grinding and granulating die for crushing and granulating, sequentially performing coarse crushing, intermediate crushing and fine crushing procedures for crushing and screening, and when the fine crushing procedure is performed, respectively spraying red color paste, green color paste and white color paste into the dry-process molded powder, and finally sieving by a 25-mesh sieve to obtain red, green and white dry-process molded powder as texture materials, and taking the rest crushed conventional dry-process molded powder as a bottom material;
(4) material distribution: injecting the dry-method molding powder obtained in the step (3) into a known press material distribution system of the imitation architectural ceramic tile, and distributing textures on a molding die according to a preset requirement in a multi-tube material distribution mode, wherein the textures are embedded in the surface, the interior and the bottom of the backing material;
(5) and (3) pressing and forming: conveying the forming die with the distributed materials to a forming station, vacuumizing, and vibrating to form, wherein the vacuumizing degree is-0.06 MPa, the vacuumizing time is 150s, and the vibration frequency is 100HZ, so as to obtain a magnesite brick blank with feather-shaped textures;
(6) and (5) maintenance: curing the magnesite brick blank obtained in the step (5), wherein the autoclave curing is carried out firstly, and then the constant-temperature constant-humidity curing is carried out, the autoclave curing temperature is 200 ℃, the pressure is 0.1MPa, and the autoclave curing time is 1 hour; the constant temperature and humidity curing temperature is 30 ℃, and the humidity is 50%, so that a magnesite board finished product with feather-shaped textures is obtained;
(7) processing treatment: and (4) performing thickness setting, grinding and polishing, surface treatment and cutting on the magnesite board finished product obtained in the step (6).
The technical principle of the present invention is described above in connection with specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive effort, which would fall within the scope of the present invention.
Claims (5)
1. A preparation method of granular powder for magnesite product molding is characterized by comprising the following steps:
step 1) material preparation: uniformly mixing raw materials for preparing the magnesite material to prepare slurry for later use; the raw materials comprise the following components in parts by weight: 100 parts of magnesium oxide, 80-130 parts of magnesium salt aqueous solution, 90-150 parts of filler and 1-50 parts of modifier;
step 2) curing: primarily curing the slurry obtained in the step 1) to form an initial curing material, wherein the moisture of the initial curing material is 5-15%; wherein, the curing time of the primary curing of the slurry obtained in the step 1) is 30-180 min, and the primary curing of the slurry obtained in the step 1) is carried out under the conditions of constant temperature and constant humidity, the temperature is 30-80 ℃, and the humidity is 40-90%;
step 3) granulation: crushing and screening the initial-stage curing material obtained in the step 2) to obtain granular powder for molding; the granular powder is used for dry-method material distribution and molding; wherein the screening treatment is screening through 18-25 meshes.
2. The process for preparing granular powder for shaping magnesite products as claimed in claim 1, which comprises the following steps: and 3) spraying color paste and/or toner to the initial solidified material in the crushing and granulating process in the granulating process of the step 3) to prepare granular powder with colors.
3. The process for preparing granular powder for shaping magnesite products as claimed in claim 1, which comprises the following steps: the magnesium salt aqueous solution is a magnesium chloride solution with a Baume degree of 22-30 and/or a magnesium sulfate solution with a concentration of 10-30%.
4. The process for preparing granular powder for shaping magnesite products as claimed in claim 1, which comprises the following steps: the filler is one or a combination of more of stone powder, quartz powder, micro silicon powder, ceramic polishing waste residue and reinforcing fiber.
5. The process for preparing granular powder for shaping magnesite products as claimed in claim 1, which comprises the following steps: the modifier is one or the combination of a water repellent agent, an interfacial agent and a defoaming agent.
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| CN103204663A (en) * | 2012-01-12 | 2013-07-17 | 广东东鹏控股股份有限公司 | Artificial stone made through using solid waste residues |
| CN103482954A (en) * | 2013-09-27 | 2014-01-01 | 佛山市东鹏陶瓷有限公司 | Artificial synthetic stone and manufacturing method thereof |
| CN103482953A (en) * | 2013-09-27 | 2014-01-01 | 佛山市东鹏陶瓷有限公司 | Artificial synthetic stone and manufacturing method thereof |
| CN103821247A (en) * | 2014-01-17 | 2014-05-28 | 德清京浙建材有限公司 | Glass-magnesium fireproof board and manufacturing method thereof |
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| CN103204663A (en) * | 2012-01-12 | 2013-07-17 | 广东东鹏控股股份有限公司 | Artificial stone made through using solid waste residues |
| CN103482954A (en) * | 2013-09-27 | 2014-01-01 | 佛山市东鹏陶瓷有限公司 | Artificial synthetic stone and manufacturing method thereof |
| CN103482953A (en) * | 2013-09-27 | 2014-01-01 | 佛山市东鹏陶瓷有限公司 | Artificial synthetic stone and manufacturing method thereof |
| CN103821247A (en) * | 2014-01-17 | 2014-05-28 | 德清京浙建材有限公司 | Glass-magnesium fireproof board and manufacturing method thereof |
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