CN110759693A - Method for producing water-resistant paper-surface gypsum board by using phosphogypsum and desulfurized gypsum - Google Patents
Method for producing water-resistant paper-surface gypsum board by using phosphogypsum and desulfurized gypsum Download PDFInfo
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- CN110759693A CN110759693A CN201810851348.XA CN201810851348A CN110759693A CN 110759693 A CN110759693 A CN 110759693A CN 201810851348 A CN201810851348 A CN 201810851348A CN 110759693 A CN110759693 A CN 110759693A
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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
- C04B11/00—Calcium sulfate cements
- C04B11/26—Calcium sulfate cements strating from chemical gypsum; starting from phosphogypsum or from waste, e.g. purification products of smoke
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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
- C04B11/00—Calcium sulfate cements
- C04B11/26—Calcium sulfate cements strating from chemical gypsum; starting from phosphogypsum or from waste, e.g. purification products of smoke
- C04B11/262—Calcium sulfate cements strating from chemical gypsum; starting from phosphogypsum or from waste, e.g. purification products of smoke waste gypsum other than phosphogypsum
- C04B11/264—Gypsum from the desulfurisation of flue gases
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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
- 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
- C04B28/14—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 calcium sulfate cements
- C04B28/142—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 calcium sulfate cements containing synthetic or waste calcium sulfate cements
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00612—Uses not provided for elsewhere in C04B2111/00 as one or more layers of a layered structure
- C04B2111/0062—Gypsum-paper board like materials
Abstract
The application discloses water-resistant gypsum board includes: plaster of paris, modified starch, silicone oil, a silicone oil catalyst, a foaming agent, water-resistant mask paper and water. The unit area mass of the water-resistant paper-surface gypsum board is 7.5kg/m2The water absorption rate is less than 8 percent and higher than the national standard requirement, and the waterproof performance is improved. The present application also provides a method of making the water-resistant gypsum board, the method comprising the steps of: (1) uniformly mixing the calcined gypsum and the modified starch, and conveying the mixture to a stirrer; (2) mixing a silicone oil catalyst with water in advance, stirring the mixture into uniform emulsion, conveying the uniform emulsion to an emulsification pump, conveying the silicone oil to the emulsification pump, fully emulsifying the emulsion and then feeding the emulsion into a stirrer; (3) the foaming agent is uniformly mixed with water in advance, and then is conveyed into another emulsification pump through metering, and compressed air is introduced for foaming; (4) will clear awayDirectly conveying water into a stirrer; (5) preparing a gypsum board wet board; (6) and preparing a finished product of the water-resistant paper-surface gypsum board.
Description
Technical Field
The application relates to the field of building materials, in particular to a water-resistant paper-surface gypsum board and a method for preparing the water-resistant paper-surface gypsum board by using phosphogypsum and desulfurized gypsum.
Background
At present, the main raw materials of the domestic paper-surface gypsum board production line are desulfurization gypsum from desulfurization waste residues of a power plant, the yield of the desulfurization gypsum is reduced gradually along with the reduction of the national firepower generated energy, and the yield of the qualified desulfurization gypsum which can be used for producing the paper-surface gypsum board is greatly reduced. In order to relieve the pressure of shortage of qualified desulfurized gypsum supply and further reduce the production cost, some enterprises mix phosphogypsum in the production of gypsum plasterboards.
Phosphogypsum is solid waste residue produced when phosphorite is treated by sulfuric acid in the production of phosphoric acid, and the main component of the phosphogypsum is calcium sulfate dihydrate and also contains various other impurities. The phosphogypsum as an industrial byproduct is low in price, but because the phosphogypsum contains impurities such as phosphoric acid, hydrogen phosphate and the like, the phosphogypsum has high acidity and a special lamellar crystal form, the use of the phosphogypsum is greatly limited, and the phosphogypsum is overstocked for a long time. On one hand, the utility model occupies land resources and causes waste, and on the other hand, the utility model is washed by rainwater. P, F impurities in the phosphogypsum can cause environmental pollution along with rainwater loss. How to realize the comprehensive utilization of the phosphogypsum and turn the phosphogypsum into wealth is a problem to be solved urgently at present.
In the production of water-resistant paper-faced gypsum boards, hydrogen-containing silicone oil is generally used as a water repellent added to the gypsum core. The hydrogen-containing silicone oil can be crosslinked to form a film at low temperature under the catalysis of metal salts, and a layer of film is formed on the surface of gypsum particles, so that the waterproof effect is achieved. However, when the water-resistant paper-surface gypsum board is produced, if phosphogypsum is doped, the slurry is acidic, so that the characteristic of forming a film by crosslinking of hydrogen-containing silicone oil is greatly reduced, and the waterproof effect of the water-resistant paper-surface gypsum board is greatly reduced. Practice proves that Si-H bonds are easy to break under acidic conditions, so neutral or alkaline slurry is easier to catalyze silicone oil to carry out crosslinking film forming, and the due waterproof effect is achieved. Therefore, if phosphogypsum is doped in desulfurized gypsum to produce water-resistant paper-surface gypsum board, a catalyst is needed to be found in addition, and the better catalytic silicone oil is crosslinked to form a film, so that the waterproof effect is improved.
Disclosure of Invention
The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.
The application provides a water-resistant paper-surface gypsum board prepared from phosphogypsum and desulfurized gypsum, wherein the mass per unit area of the water-resistant paper-surface gypsum board is 7.5kg/m2The water absorption rate is less than 8 percent and higher than the national standard requirement (less than 10 percent), the waterproof performance is improved, the comprehensive utilization of the phosphogypsum is realized, and the problems of land resource waste, environmental pollution and the like caused by excessive stacking of the phosphogypsum can be greatly relieved.
Specifically, the present application provides a water-resistant gypsum board comprising: plaster of paris, modified starch, silicone oil, a silicone oil catalyst, a foaming agent, water-resistant mask paper and water.
In the present application, the water-resistant gypsum board may be mainly composed of plaster of paris, modified starch, silicone oil, a silicone oil catalyst, a foaming agent, water-resistant mask paper, and water.
In the application, the weight parts of other components are calculated according to 100 parts of the plaster: the modified starch can be 0.4-0.65 part, the silicone oil can be 0.25-0.4 part, the silicone oil catalyst can be 0.15-0.6 part, the foaming agent can be 0.04-0.14 part, the waterproof mask paper can be 5-8 parts, and the total amount of water can be 70-85 parts.
In the present application, the starch may be a modified corn starch or a mixture of corn starch and tapioca starch.
In the present application, the silicone oil may be methyl hydrogen-containing silicone oil having a chemical formula of (CH)3)3SiO[(CH3)(H)SiO]nSi(CH3)3The hydrogen content is not less than 1.58%.
In the application, the silicone oil catalyst can be 325-mesh cement, heavy calcium oxide, heavy magnesium oxide, dolomite high-temperature calcination product or a mixture thereof, and the fineness is more than 325 meshes.
In the present application, the foaming agent may be sodium dodecyl sulfate or sodium dodecyl benzene sulfonate, and the solid content is more than 35%.
In the present application, the water-resistant face-protecting paper, the 10 minute water absorption of the top layer may not exceed 35g/m2The water absorption capacity of the inner layer in 1 minute can be 25g/m2～40g/m2。
The present application also provides a method of making the water-resistant gypsum board, the method comprising the steps of:
(1) respectively conveying the calcined gypsum and the modified starch to a mixing reamer through metering, and conveying the calcined gypsum and the modified starch to a stirrer after uniformly mixing;
(2) mixing a silicone oil catalyst with water in advance, stirring to form uniform emulsion, metering and conveying to an emulsification pump, controlling the pH value of slurry to be 6.5-8, meanwhile metering and conveying the silicone oil to the emulsification pump, fully emulsifying and then feeding into a stirrer;
(3) the foaming agent is uniformly mixed with water in advance, the mixture enters another emulsifying pump through metering and conveying, compressed air is introduced for foaming, the conveying amount of a foaming agent mixed solution is determined according to the amount of slurry required by wet plate forming, pure slurry is prepared according to the weight ratio of produced actual water paste without foaming and stirring, the density Q1 of the pure slurry is detected, the density Q2 of the produced actual slurry is determined through methods such as one-control actual measurement and wet plate theoretical calculation, and the amount V1 of air doped into the slurry in unit volume is 1-Q2/Q1 under atmospheric pressure; the converted compressed air volume V is V1/(P +1), and P is the compressed air pressure;
(4) directly conveying clear water into a stirrer by metering, wherein the conveying amount of the clear water is determined according to the weight ratio of water paste, and the weight ratio of the water paste is controlled to be 70-85%;
(5) the dry materials and the wet materials are fully stirred in a stirrer to form uniform slurry, and the uniform slurry is continuously poured between two layers of waterproof protective paper and is extruded and formed to prepare a wet gypsum board;
(6) and (3) solidifying the wet gypsum board, cutting, drying, edge sawing, edge sealing, stacking, packaging and the like to obtain a finished product of the water-resistant paper-surface gypsum board.
In the method of the present application, the plaster of paris can be prepared by:
mixing and homogenizing the phosphogypsum and the desulfurized gypsum according to the ratio of 1: 1-3;
quickly calcining by a hammer type scattering machine to remove attached water and part of crystal water to prepare an intermediate material;
the crystallization water of the intermediate material can be controlled to be 10-11% by adjusting the temperature to be within the range of 142-152 ℃, collected by electric dust collection and then conveyed to a boiling calciner for slow calcination, if the crystallization water is too high, the electric dust collection is likely to dewfall and the efficiency is reduced, and if the crystallization water is too low, the local gypsum is likely to be overburnt, and the anhydrous gypsum is increased;
the calcining temperature of the boiling calciner can be adjusted within the range of 145-160 ℃, the crystal water of the calcined gypsum is controlled to reach the range of 5-5.5 percent, anhydrous gypsum and dihydrate gypsum can be caused due to equipment heating and non-uniformity of a gypsum mixed material in actual production, the anhydrous gypsum and the hemihydrate gypsum are reduced for maximum disinfection, and the crystal water is controlled within the range of 5-5.5 percent;
then conveying the gypsum powder into a ball mill for grinding, adjusting the grading and the quantity of grinding bodies of the ball mill, and controlling the specific surface area of the calcined gypsum to be 3500cm2/g～4500cm2In the range of/g, conveying the mixture to a cooked material bin, aging the mixture for standby, wherein the ballsThe specification of the mill is phi 1.83 x 7m, the grinding body uses high chromium steel sections with different sizes, the total weight is about 6 tons, and the grinding body is divided into phi 14, 5%, phi 16, 15%, phi 18, 25%, phi 20, 25%, phi 25, 15%, phi 30, 10%, phi 35, 5%.
In the method, the grade of the phosphogypsum can be more than 88%, and the PH value is 3-5; the grade of the desulfurized gypsum can be more than 90%, and the pH value is 6-7.
The water-resistant gypsum board prepared by the method has the mass per unit area of 7.5kg/m2The water absorption rate can reach below 8 percent and is higher than the national standard requirement, and the waterproof performance is greatly improved; the price of the selected silicone oil catalyst is low, the addition amount of the silicone oil is greatly reduced, and the production cost is reduced; the influence of the phosphogypsum on the silicon oil crosslinking film forming property is eliminated, the phosphogypsum is smoothly applied to the production of the water-resistant paper-surface gypsum board, the comprehensive utilization of the phosphogypsum is realized, and the problems of land resource waste, environmental pollution and the like caused by excessive stacking of the phosphogypsum can be greatly relieved.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the application. The objectives and other advantages of the application may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the claimed subject matter and are incorporated in and constitute a part of this specification, illustrate embodiments of the subject matter and together with the description serve to explain the principles of the subject matter and not to limit the subject matter.
FIG. 1 is a process flow diagram of the water-resistant paper-faced gypsum board of the present application. The present application provides a method of making a water-resistant gypsum board, the method comprising the steps of: (1) respectively conveying the calcined gypsum and the modified starch to a mixing reamer through metering, and conveying the calcined gypsum and the modified starch to a stirrer after uniformly mixing; (2) mixing a silicone oil catalyst with water in advance, stirring to form uniform emulsion, metering and conveying to an emulsification pump, controlling the pH value of slurry to be 6.5-8, meanwhile metering and conveying the silicone oil to the emulsification pump, fully emulsifying and then feeding into a stirrer; (3) the foaming agent is uniformly mixed with water in advance, the mixture enters another emulsifying pump after being metered and conveyed, compressed air is introduced for foaming, and the conveying amount of the foaming agent mixed solution is determined according to the amount of slurry required by wet plate forming; (4) directly conveying clear water into a stirrer by metering, wherein the conveying amount of the clear water is determined according to the weight ratio of water paste, and the weight ratio of the water paste is controlled to be 70-85%; (5) the dry materials and the wet materials are fully stirred in a stirrer to form uniform slurry, and the uniform slurry is continuously poured between two layers of waterproof protective paper and is extruded and formed to prepare a wet gypsum board; (6) and (3) solidifying the wet gypsum board, cutting, drying, edge sawing, edge sealing, stacking, packaging and the like to obtain a finished product of the water-resistant paper-surface gypsum board.
Detailed Description
To make the objects, technical solutions and advantages of the present application more apparent, embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
Example 1
Preparation of calcined gypsum:
mixing and homogenizing 1 part of the phosphogypsum and 1 part of the desulfurized gypsum (the phosphogypsum is 88 percent in grade, the PH5, the desulfurized gypsum is 90 percent in grade, and the pH is 7). And (3) rapidly calcining by using a hammer type scattering machine to remove attached water and part of crystal water to obtain an intermediate material. The crystallization water of the intermediate material is controlled to be 10-11 percent by adjusting the temperature to be within the range of 142-152 ℃, collected by electric dust collection and then conveyed to a boiling calciner for slow calcination. The calcining temperature of the boiling calciner is adjusted to be within the range of 14-160 ℃, and the crystal water of the calcined gypsum is controlled to be within the range of 5-5.5 percent. Then conveying the gypsum powder into a ball mill for grinding, adjusting the grading and the quantity of grinding bodies of the ball mill, and controlling the specific surface area of the calcined gypsum to be 3500cm2/g～4500cm2And conveying the mixture to a ripening bin within the range of/g, and aging for later use, wherein the specification of the ball mill is phi 1.83 to 7m, the grinding body adopts high chromium steel sections with different sizes, and the total weight is about 6 tons and is divided into phi 14, 5 percent, phi 16 and 15 percent, phi 18 and 25 percent, phi 20 and 25 percent, phi 25 and 15 percent, phi 30 and 10 percent, phi 35 and 5 percent.
Preparation of a water-resistant gypsum board:
100 parts of calcined gypsum and 0.5 part of modified starch are respectively conveyed to a mixing reamer through metering, and are conveyed to a stirrer after being uniformly mixed. 0.5 part of 325 parts of cement as a silicone oil catalyst is mixed with 15 parts of water in advance, stirred into uniform emulsion, metered and conveyed to an emulsion pump, and simultaneously 0.38 part of silicone oil is metered and conveyed to the emulsion pump, and the mixture is fully emulsified and then enters a stirrer. 0.05 part of foaming agent sodium dodecyl sulfate is uniformly mixed with 5 parts of water in advance, the mixture is conveyed into another emulsifying pump through metering, and compressed air is introduced for foaming under the conditions that the pressure is 0.25Mpa and the flow rate is 2.8 cubic meters per hour. Directly conveying 45 parts of clear water into a stirrer by metering, wherein the conveying amount of the clear water is determined according to a water-paste ratio which is controlled to be 70-85%;
fully stirring the dry materials and the wet materials in a stirrer to form uniform slurry, controlling the pH value of the slurry to be 6.5-8, and continuously pouring the slurry on two layers of water-resistant protective paper (the water absorption of a surface layer is 35 g/m)210 minutes, inner layer water absorption: 25g/m21 minute), and extrusion molding to obtain the wet gypsum board. And (3) solidifying the wet gypsum board, cutting, drying, edge sawing, edge sealing, stacking, packaging and the like to obtain a finished product of the water-resistant paper-surface gypsum board.
Example 2
Preparation of calcined gypsum:
mixing and homogenizing 1 part of the phosphogypsum and 2 parts of the desulfurized gypsum (the phosphogypsum is 89 percent in grade, the PH4, the desulfurized gypsum is 91 percent in grade, and the PH is 7). And (3) rapidly calcining by using a hammer type scattering machine to remove attached water and part of crystal water to obtain an intermediate material. The temperature is adjusted within the range of 142-152 ℃, the intermediate material crystal water is controlled to be 10-11 percent, collected by electric dust collection and then conveyed to a boiling calciner for slow calcination. The calcining temperature of the boiling calciner is adjusted within the range of 145-160 ℃, and the crystal water of the calcined gypsum is controlled to be within the range of 5-5.5 percent. Then conveying the gypsum powder into a ball mill for grinding, adjusting the grading and the quantity of grinding bodies of the ball mill, and controlling the specific surface area of the calcined gypsum to be 3500cm2/g～4500cm2And conveying the mixture to a cooked material bin within the range of/g, and aging for later use.
Preparation of a water-resistant gypsum board:
100 parts of plaster of paris and 0.55 part of modified starch are respectively conveyed to a mixing reamer through metering, and conveyed to a stirrer after being uniformly mixed. 0.3 part of heavy calcium oxide of a silicone oil catalyst is mixed with 15 parts of water in advance, stirred into uniform emulsion, metered and conveyed to an emulsification pump, and simultaneously 0.35 part of silicone oil is metered and conveyed to the emulsification pump, and the mixture enters a stirrer after being fully emulsified. 0.05 part of foaming agent sodium dodecyl sulfate is uniformly mixed with 5 parts of water in advance, the mixture is conveyed into another emulsifying pump through metering, and compressed air is introduced for foaming under the conditions that the pressure is 0.25Mpa and the flow rate is 2.8 cubic meters per hour. 48 parts of clean water is directly conveyed into a stirrer by metering, the conveying amount of the clean water is determined according to a water-paste ratio which is controlled to be 70-85%;
fully stirring the dry materials and the wet materials in a stirrer to form uniform slurry, controlling the pH value of the slurry to be 6.5-8, and continuously pouring the slurry into two layers of water-resistant protective paper (the water absorption of a surface layer: 38 g/m)210 minutes, inner layer water absorption: 22g/m2/l minute), and extrusion molding to obtain the wet gypsum board. And (3) solidifying the wet gypsum board, cutting, drying, edge sawing, edge sealing, stacking, packaging and the like to obtain a finished product of the water-resistant paper-surface gypsum board.
Example 3
Preparation of calcined gypsum:
mixing and homogenizing 1 part of the phosphogypsum and 3 parts of the desulfurized gypsum (the phosphogypsum is 89.5 percent in grade, the PH3, the desulfurized gypsum is 92 percent in grade, and the PH 6). And (3) rapidly calcining by using a hammer type scattering machine to remove attached water and part of crystal water to obtain an intermediate material. The intermediate material crystallization water is controlled to be 10-11% by adjusting the temperature to be within the range of 142-152 ℃, collected by electric dust collection and then conveyed to a boiling calciner for slow calcination. The calcining temperature of the boiling calciner is adjusted within the range of 145-160 ℃, and the crystal water of the calcined gypsum is controlled to be within the range of 5-5.5 percent. Then conveying the gypsum powder into a ball mill for grinding, adjusting the grading and the quantity of grinding bodies of the ball mill, and controlling the specific surface area of the calcined gypsum to be 3500cm2/g～4500cm2And conveying the mixture to a cooked material bin within the range of/g, and aging for later use.
Preparation of a water-resistant gypsum board:
100 parts of plaster of paris and 0.6 part of modified starch are respectively conveyed to a mixing reamer through metering, and conveyed to a stirrer after being uniformly mixed. 0.2 part of heavy magnesium oxide of a silicone oil catalyst is mixed with 15 parts of water in advance, stirred into uniform emulsion, metered and conveyed to an emulsification pump, and simultaneously 0.3 part of silicone oil is metered and conveyed to the emulsification pump, and the mixture enters a stirrer after being fully emulsified. 0.05 part of foaming agent sodium dodecyl sulfate is uniformly mixed with 5 parts of water in advance, the mixture is conveyed into another emulsifying pump through metering, and compressed air is introduced for foaming under the conditions that the pressure is 0.25Mpa and the flow rate is 2.8 cubic meters per hour. 46 parts of clean water is directly conveyed into a stirrer by metering, the conveying amount of the clean water is determined according to a water-paste ratio which is controlled to be 70-85%;
fully stirring the dry materials and the wet materials in a stirrer to form uniform slurry, controlling the pH value of the slurry to be 6.5-8, and continuously pouring the slurry into two layers of water-resistant protective paper (the water absorption of a surface layer is 34 g/m)210 minutes, inner layer water absorption: 20g/m21 minute), and extrusion molding to obtain the wet gypsum board. And (3) solidifying the wet gypsum board, cutting, drying, edge sawing, edge sealing, stacking, packaging and the like to obtain a finished product of the water-resistant paper-surface gypsum board.
Comparative example:
preparation of calcined gypsum:
mixing and homogenizing 1 part of the phosphogypsum and 1 part of the desulfurized gypsum (the phosphogypsum is 88 percent in grade, PH5, the desulfurized gypsum is 90 percent in grade, and the PH 7). Calcined gypsum powder is prepared by calcining and grinding, the crystal water of calcined gypsum is controlled to be within the range of 5-5.5 percent, and the specific surface area is 3500cm2/g～4500cm2And conveying the mixture to a cooked material bin within the range of/g, and aging for later use.
Preparation of a water-resistant gypsum board:
100 parts of plaster of paris and 0.6 part of modified starch are respectively conveyed to a mixing reamer through metering, and conveyed to a stirrer after being uniformly mixed. 0.4 part of silicone oil and 15 parts of clean water are respectively metered and conveyed to an emulsification pump, and are fully emulsified and then enter a stirrer.
0.05 part of foaming agent sodium dodecyl sulfate is uniformly mixed with 5 parts of water in advance, the mixture is conveyed into another emulsifying pump through metering, and compressed air is introduced for foaming under the conditions that the pressure is 0.25Mpa and the flow rate is 2.8 cubic meters per hour. Directly conveying 45 parts of clear water into a stirrer by metering, wherein the conveying amount of the clear water is determined according to a water-paste ratio which is controlled to be 70-85%;
stirring the above dry materials and wet materials in a stirrer to form uniform slurry (pH value of slurry is not required), and continuously pouring into two layers of water-resistant face-protecting paper (surface layer water absorption: 35 g/m)210 minutes, inner layer water absorption: 24g/m21 minute), and extrusion molding to obtain the wet gypsum board. And (3) solidifying the wet gypsum board, cutting, drying, edge sawing, edge sealing, stacking, packaging and the like to obtain a finished product of the water-resistant paper-surface gypsum board.
The water absorption and surface water absorption of the gypsum boards prepared in examples 1-3 and the gypsum boards in the comparative examples are listed in table 1 according to the national standard GB/T9775-2008 paper-faced gypsum board test.
The unit area mass of the water-resistant paper-surface gypsum board prepared by the method is 7.5kg/m2The water absorption rate can reach below 8 percent and is higher than the national standard requirement; under the condition of selecting water-resistant mask paper with similar indexes, the surface water absorption is greatly improved; the selected silicone oil catalyst has low price, eliminates the influence of the phosphogypsum on the cross-linking film forming property of the silicone oil, and greatly improves the waterproof performance; the addition of silicone oil is greatly reduced, so that the phosphogypsum is smoothly applied to the production of water-resistant gypsum plasterboards, the product quality is improved, the production cost is reduced, the comprehensive utilization of the phosphogypsum is realized, and the problems of land resource waste, environmental pollution and the like caused by excessive stacking of the phosphogypsum can be greatly relieved.
Although the embodiments disclosed in the present application are described above, the descriptions are only for the convenience of understanding the present application, and are not intended to limit the present application. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the disclosure as defined by the appended claims.
Claims (10)
1. A water-resistant gypsum board comprising: plaster of paris, modified starch, silicone oil, a silicone oil catalyst, a foaming agent, water-resistant mask paper and water.
2. The water-resistant gypsum board of claim 1, wherein the weight parts of the other components are calculated according to 100 parts of the plaster: 0.4-0.65 part of modified starch, 0.25-0.4 part of silicone oil, 0.15-0.6 part of silicone oil catalyst, 0.04-0.14 part of foaming agent, 5-8 parts of water-resistant mask paper and 70-85 parts of water in total.
3. The water-resistant gypsum board of claim 1 or 2, wherein the starch is a modified corn starch or a mixture of corn starch and tapioca starch.
4. The water-resistant gypsum board of claim 1 or 2, wherein the silicone oil is methyl hydrogen-containing silicone oil of formula (CH)3)3SiO[(CH3)(H)SiO]nSi(CH3)3The hydrogen content is not less than 1.58%.
5. The water-resistant gypsum board as claimed in claim 1 or 2, wherein the silicone oil catalyst is 325 mesh cement or heavy calcium oxide or heavy magnesium oxide or dolomite high-temperature calcination product or a mixture thereof, and the fineness is 325 mesh or more.
6. The water-resistant gypsum board of claim 1 or 2, wherein the foaming agent is sodium dodecyl sulfate or sodium dodecyl benzene sulfonate and has a solids content of 35% or more.
7. The water-resistant gypsum board of claim 1 or 2, wherein the water-resistant facing paper, facing layer, has a 10 minute water absorption of no more than 35g/m2The water absorption capacity of the inner layer in 1 minute is 25g/m2～40g/m2。
8. A method of making the water-resistant gypsum board of any one of claims 1-8, the method comprising the steps of:
(1) respectively conveying the calcined gypsum and the modified starch to a mixing reamer through metering, and conveying the calcined gypsum and the modified starch to a stirrer after uniformly mixing;
(2) mixing a silicone oil catalyst with water in advance, stirring to form uniform emulsion, metering and conveying to an emulsification pump, controlling the pH value of slurry to be 6.5-8, meanwhile metering and conveying the silicone oil to the emulsification pump, fully emulsifying and then feeding into a stirrer;
(3) the foaming agent is uniformly mixed with water in advance, the mixture enters another emulsifying pump after being metered and conveyed, compressed air is introduced for foaming, and the conveying amount of the foaming agent mixed solution is determined according to the amount of slurry required by wet plate forming;
(4) directly conveying clear water into a stirrer by metering, wherein the conveying amount of the clear water is determined according to the weight ratio of water paste, and the weight ratio of the water paste is controlled to be 70-85%;
(5) the dry materials and the wet materials are fully stirred in a stirrer to form uniform slurry, and the uniform slurry is continuously poured between two layers of waterproof protective paper and is extruded and formed to prepare a wet gypsum board;
(6) and (3) solidifying the wet gypsum board, cutting, drying, edge sawing, edge sealing, stacking, packaging and the like to obtain a finished product of the water-resistant paper-surface gypsum board.
9. The method of claim 8, wherein the plaster of paris is prepared by:
mixing and homogenizing the phosphogypsum and the desulfurized gypsum according to the ratio of 1: 1-3;
quickly calcining by a hammer type scattering machine to remove attached water and part of crystal water to prepare an intermediate material;
controlling the crystallization water of the intermediate material to be 10-11% by adjusting the temperature, collecting the crystallization water by electric dust collection, and conveying the crystallization water to a boiling calciner for slow calcination;
adjusting the calcining temperature of the boiling calciner, and controlling the calcined gypsum crystal water to reach the range of 5-5.5%;
then conveying the gypsum powder into a ball mill for grinding, adjusting the grading and the quantity of grinding bodies of the ball mill, and controlling the specific surface area of the calcined gypsum to be 3500cm2/g～4500cm2And conveying the mixture to a cooked material bin within the range of/g, and aging for later use.
10. The method according to claim 9, wherein the phosphogypsum grade is above 88%, and the pH value is 3-5; the grade of the desulfurized gypsum is more than 90%, and the pH value is 6-7.
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