CN113480210A - Process for producing alpha high-strength gypsum powder by using industrial byproduct gypsum - Google Patents
Process for producing alpha high-strength gypsum powder by using industrial byproduct gypsum Download PDFInfo
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- CN113480210A CN113480210A CN202110960504.8A CN202110960504A CN113480210A CN 113480210 A CN113480210 A CN 113480210A CN 202110960504 A CN202110960504 A CN 202110960504A CN 113480210 A CN113480210 A CN 113480210A
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- gypsum
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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
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/46—Sulfates
- C01F11/466—Conversion of one form of calcium sulfate to another
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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
- C04B11/02—Methods and apparatus for dehydrating gypsum
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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
- C04B11/02—Methods and apparatus for dehydrating gypsum
- C04B11/024—Ingredients added before, or during, the calcining process, e.g. calcination modifiers
Abstract
The invention discloses a process for producing alpha high-strength gypsum powder by using industrial byproduct gypsum, which comprises the following steps: weighing the industrial byproduct gypsum and the additive according to the proportion, firstly mixing the additive in a V-shaped mixer for 20-40min, then adding the additive into the industrial byproduct gypsum and mixing for 20-40 min; after being uniformly mixed, the mixture is pressed into raw gypsum blocks by a press machine, and the raw gypsum blocks are stacked on a still kettle carrier; feeding the autoclave carrier into a horizontal autoclave for autoclave dehydration to obtain a semi-finished product; and (3) drawing the dehydrated semi-finished product to a drying kiln for drying, and crushing the dried semi-finished product to obtain the alpha high-strength gypsum powder. The invention can effectively utilize industrial byproduct gypsum, uses the briquetting process, fully exerts the advantages of low process cost, large yield and small investment of the dry steaming process, and simultaneously improves the product quality by adding the additive, so that the product reaches the level of the product of the liquid phase process.
Description
Technical Field
The invention relates to the technical field of gypsum powder production, in particular to a process for producing alpha high-strength gypsum powder by using industrial byproduct gypsum.
Background
The existing production processes of alpha gypsum powder mainly comprise two types:
1) the dry steaming process comprises the following steps: crushing gypsum ore into blocks with uniform size, filling the blocks into a frame, then sending the blocks into a horizontal autoclave for autoclaved dehydration, and sending the dehydrated semi-finished product into a drying kiln for drying. And crushing the dried semi-hydrated gypsum blocks into powder to obtain the finished product. The process has the advantages that: low dehydration energy consumption, simple process, large output per unit time and low production cost. The production equipment has low cost and less investment. The process has the following defects: the finished product has low strength (the 2h bending resistance is 4.5-5.5 MPa); can only be used for producing blocky natural gypsum and can not be used for producing alpha high-strength gypsum powder by using powdery industrial by-product gypsum.
2) The liquid phase method comprises the following steps: grinding powdered industrial by-product gypsum or natural gypsum ore into powder, mixing with water and crystal modifier, and dewatering at high temperature and high pressure. And (4) carrying out solid-liquid separation on the dehydrated slurry in a liquid-solid separation device. And drying the powder to obtain a finished product. The process has the advantages that: is suitable for the production of industrial by-product gypsum and natural gypsum. The finished product has high strength (2h rupture resistance 6.5-8.5 MPa). The process has the following defects: high dehydration energy consumption, complex process, low production per unit time and high production cost. The production equipment has high cost and large investment.
Therefore, there is a need for an improved and optimized production process of the existing alpha gypsum powder.
Disclosure of Invention
The invention aims to overcome the problems in the prior art and provide a process for producing alpha high-strength gypsum powder by using industrial by-product gypsum.
In order to achieve the technical purpose and achieve the technical effect, the invention is realized by the following technical scheme:
a process for producing alpha high-strength gypsum powder by using industrial byproduct gypsum comprises the following steps:
a. weighing the industrial byproduct gypsum and the additive according to the proportion, firstly mixing the additive in a V-shaped mixer for 20-40min, then adding the additive into the industrial byproduct gypsum and mixing for 20-40 min;
b. after being uniformly mixed, the mixture is pressed into raw gypsum blocks by a press machine, and the raw gypsum blocks are stacked on a still kettle carrier;
c. feeding the autoclave carrier into a horizontal autoclave for autoclave dehydration to obtain a semi-finished product;
d. and (3) drawing the dehydrated semi-finished product to a drying kiln for drying, and crushing the dried semi-finished product to obtain the alpha high-strength gypsum powder.
Further, in the process for producing the alpha high-strength gypsum powder by using the industrial by-product gypsum as described above, in the step a, the industrial by-product gypsum is obtained by performing desulfurization and purification treatment on flue gas generated after combustion of sulfur-containing fuel.
Further, in the process for producing the alpha high-strength gypsum powder by using the industrial by-product gypsum, in the step a, the mass ratio of the industrial by-product gypsum to the additive is 100: 0.7-4.
Further, in the process for producing the alpha high-strength gypsum powder by using the industrial byproduct gypsum, in the step a, the additive is prepared by mixing the following raw materials in parts by mass: 1-10 parts of a crystal modifier, 1-10 parts of a binder and 5-20 parts of a high-efficiency water reducing agent.
Further, in the process for producing the alpha high-strength gypsum powder by using the industrial byproduct gypsum, the crystallization regulator is formed by mixing sodium citrate, aluminum sulfate and sulfonated melamine according to the mass ratio of 1:1: 2.
Further, in the process for producing the alpha high-strength gypsum powder by using the industrial byproduct gypsum, the binder is lignosulfonate.
Further, in the process for producing the alpha high-strength gypsum powder by using the industrial byproduct gypsum, the high-efficiency water reducing agent is a polycarboxylic acid water reducing agent polymerized by HPEG with a relative molecular weight of 3600 and acrylic acid, and the acid-ether ratio of the polycarboxylic acid water reducing agent is 4: 1.
further, in the process for producing the alpha high-strength gypsum powder by using the industrial byproduct gypsum, the drying temperature in the step d is 100-.
Further, in the process for producing the alpha high-strength gypsum powder by using the industrial byproduct gypsum, in the step b, the raw gypsum block is in a granular shape, and the diameter of the granular shape is 30-50mm, and the height of the granular shape is 50-100 mm.
Further, in the process for producing the alpha high-strength gypsum powder by using the industrial byproduct gypsum, in the step b, the raw gypsum block is in a block shape, and the block shape has a length of 20-25mm, a width of 4-8mm and a height of 10-15 mm.
The invention has the beneficial effects that:
1. the invention has scientific and reasonable formula design, can effectively utilize the industrial byproduct gypsum obtained by desulfurization and purification treatment of flue gas generated after combustion of sulfur-containing fuel, realizes the production of the industrial byproduct gypsum alpha high-strength powder by a dry steaming method by using a briquetting method process, fully exerts the advantages of low process cost, high yield and low investment of the dry steaming method, and simultaneously improves the quality of the product by adding the additive, so that the product reaches the level of the product of a liquid phase method process.
2. The additive is reasonable in design, and the crystal growth of industrial byproduct gypsum in the dehydration and recrystallization processes can be controlled by the matching of the crystal modifier and the high-efficiency water reducing agent, so that alpha gypsum grows into coarse crystals in short columns, the water consumption for standard consistency can be effectively reduced, and the strength is increased. The adhesive can improve the bonding strength of desulfurized gypsum during granulation or pressing into bricks, so that the gypsum bricks can be conveniently stacked without collapse.
Of course, it is not necessary for any one product that embodies the invention to achieve all of the above advantages simultaneously.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the 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 embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A process for producing alpha high-strength gypsum powder by using industrial byproduct gypsum comprises the following steps:
a. weighing the industrial byproduct gypsum and the additive according to the proportion, firstly mixing the additive in a V-shaped mixer for 20-40min, then adding the additive into the industrial byproduct gypsum and mixing for 20-40 min;
b. after being uniformly mixed, the mixture is pressed into raw gypsum blocks by a press machine, and the raw gypsum blocks are stacked on a still kettle carrier;
c. the autoclave carrier is sent into a horizontal autoclave for autoclave dehydration, steam pressure is 0.6Mpa, and autoclave time is 12 hours, so as to obtain a semi-finished product;
d. and (3) drawing the dehydrated semi-finished product to a drying kiln for drying at the temperature of 100-120 ℃, and crushing the dried semi-finished product to obtain the alpha high-strength gypsum powder.
In the invention, the industrial by-product gypsum is obtained by desulfurizing and purifying flue gas generated after combustion of sulfur-containing fuel, and the mass ratio of the industrial by-product gypsum to an additive is 100: 0.7-4. The additive is prepared by mixing the following raw materials in parts by mass: 1-10 parts of a crystal modifier, 1-10 parts of a binder and 5-20 parts of a high-efficiency water reducing agent.
In the invention, the crystallization regulator is prepared by mixing sodium citrate, aluminum sulfate and sulfonated melamine according to the mass ratio of 1:1: 2. The binder is lignosulfonate. The high-efficiency water reducing agent is a polycarboxylic acid water reducing agent polymerized by HPEG with the relative molecular weight of 3600 and acrylic acid, and the acid-ether ratio of the high-efficiency water reducing agent is 4: 1.
the related specific embodiments of the invention are as follows:
example 1
A process for producing alpha high-strength gypsum powder by using industrial byproduct gypsum comprises the following steps:
a. weighing the industrial by-product gypsum and the additive according to the proportion, firstly mixing the additive in a V-shaped mixer for 30min, then adding the additive into the industrial by-product gypsum and mixing for 30 min;
b. after uniform mixing, pressing the mixture into a raw gypsum block by a press, wherein the raw gypsum block is in a block shape, and the block shape is 25mm in length, 6mm in width and 12mm in height; stacking the gypsum blocks on a still kettle carrier;
c. feeding the autoclave carrier into a horizontal autoclave for autoclave dehydration to obtain a semi-finished product;
d. and (3) drawing the dehydrated semi-finished product to a drying kiln for drying at the drying temperature of 100 ℃, and crushing the dried semi-finished product to obtain the alpha high-strength gypsum powder.
In this example, the mass ratio of the industrial by-product gypsum to the additive is 100: 2. the additive is prepared by mixing the following raw materials in parts by mass: 5 parts of a crystal modifier, 5 parts of a binder and 10 parts of a high-efficiency water reducing agent.
Example 2
A process for producing alpha high-strength gypsum powder by using industrial byproduct gypsum comprises the following steps:
a. weighing the industrial by-product gypsum and the additive according to the proportion, firstly mixing the additive in a V-shaped mixer for 20min, then adding the additive into the industrial by-product gypsum and mixing for 40 min;
b. after uniform mixing, pressing the mixture into a raw gypsum block by a press, wherein the raw gypsum block is in a block shape, and the block shape is 25mm in length, 6mm in width and 12mm in height; stacking the gypsum blocks on a still kettle carrier;
c. feeding the autoclave carrier into a horizontal autoclave for autoclave dehydration to obtain a semi-finished product;
d. and (3) drawing the dehydrated semi-finished product to a drying kiln for drying at the drying temperature of 110 ℃, and crushing the dried semi-finished product to obtain the alpha high-strength gypsum powder.
In this example, the mass ratio of the industrial by-product gypsum to the additive is 100: 2. the additive is prepared by mixing the following raw materials in parts by mass: 1 part of a crystal modifier, 1 part of a binder and 20 parts of a high-efficiency water reducing agent.
Example 3
A process for producing alpha high-strength gypsum powder by using industrial byproduct gypsum comprises the following steps:
a. weighing the industrial by-product gypsum and the additive according to the proportion, firstly mixing the additive in a V-shaped mixer for 40min, then adding the additive into the industrial by-product gypsum and mixing for 20 min;
b. after uniform mixing, pressing the mixture into a raw gypsum block by a press, wherein the raw gypsum block is in a block shape, and the block shape is 25mm in length, 6mm in width and 12mm in height; stacking the gypsum blocks on a still kettle carrier;
c. feeding the autoclave carrier into a horizontal autoclave for autoclave dehydration to obtain a semi-finished product;
d. and (3) drawing the dehydrated semi-finished product to a drying kiln for drying at the drying temperature of 120 ℃, and crushing the dried semi-finished product to obtain the alpha high-strength gypsum powder.
In this example, the mass ratio of the industrial by-product gypsum to the additive is 100: 2. the additive is prepared by mixing the following raw materials in parts by mass: 10 parts of a crystal modifier, 5 parts of a binder and 20 parts of a high-efficiency water reducing agent.
Example 4
A process for producing alpha high-strength gypsum powder by using industrial byproduct gypsum comprises the following steps:
a. weighing the industrial by-product gypsum and the additive according to the proportion, firstly mixing the additive in a V-shaped mixer for 30min, then adding the additive into the industrial by-product gypsum and mixing for 30 min;
b. after uniformly mixing, pressing the mixture into a raw gypsum block by a press, wherein the raw gypsum block is in a granular shape, and the diameter of the granular shape is 40mm, and the height of the granular shape is 80 mm; stacking the gypsum blocks on a still kettle carrier;
c. feeding the autoclave carrier into a horizontal autoclave for autoclave dehydration to obtain a semi-finished product;
d. and (3) drawing the dehydrated semi-finished product to a drying kiln for drying at the drying temperature of 110 ℃, and crushing the dried semi-finished product to obtain the alpha high-strength gypsum powder.
In this example, the mass ratio of the industrial by-product gypsum to the additive is 100: 4. the additive is prepared by mixing the following raw materials in parts by mass: 5 parts of a crystal modifier, 5 parts of a binder and 10 parts of a high-efficiency water reducing agent.
Example 5
A process for producing alpha high-strength gypsum powder by using industrial byproduct gypsum comprises the following steps:
a. weighing the industrial by-product gypsum and the additive according to the proportion, firstly mixing the additive in a V-shaped mixer for 20min, then adding the additive into the industrial by-product gypsum and mixing for 40 min;
b. after uniformly mixing, pressing the mixture into a raw gypsum block by a press, wherein the raw gypsum block is in a granular shape, and the diameter of the granular shape is 40mm, and the height of the granular shape is 80 mm; stacking the gypsum blocks on a still kettle carrier;
c. feeding the autoclave carrier into a horizontal autoclave for autoclave dehydration to obtain a semi-finished product;
d. and (3) drawing the dehydrated semi-finished product to a drying kiln for drying at the drying temperature of 100 ℃, and crushing the dried semi-finished product to obtain the alpha high-strength gypsum powder.
In this example, the mass ratio of the industrial by-product gypsum to the additive is 100: 4. the additive is prepared by mixing the following raw materials in parts by mass: 1 part of a crystal modifier, 1 part of a binder and 8 parts of a high-efficiency water reducing agent.
Example 6
A process for producing alpha high-strength gypsum powder by using industrial byproduct gypsum comprises the following steps:
a. weighing the industrial by-product gypsum and the additive according to the proportion, firstly mixing the additive in a V-shaped mixer for 40min, then adding the additive into the industrial by-product gypsum and mixing for 20 min;
b. after uniformly mixing, pressing the mixture into a raw gypsum block by a press, wherein the raw gypsum block is in a granular shape, and the diameter of the granular shape is 40mm, and the height of the granular shape is 80 mm; stacking the gypsum blocks on a still kettle carrier;
c. feeding the autoclave carrier into a horizontal autoclave for autoclave dehydration to obtain a semi-finished product;
d. and (3) drawing the dehydrated semi-finished product to a drying kiln for drying at the drying temperature of 120 ℃, and crushing the dried semi-finished product to obtain the alpha high-strength gypsum powder.
In this example, the mass ratio of the industrial by-product gypsum to the additive is 100: 4. the additive is prepared by mixing the following raw materials in parts by mass: 10 parts of a crystal modifier, 10 parts of a binder and 10 parts of a high-efficiency water reducing agent.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (10)
1. A process for producing alpha high-strength gypsum powder by using industrial byproduct gypsum is characterized by comprising the following steps:
a. weighing the industrial byproduct gypsum and the additive according to the proportion, firstly mixing the additive in a V-shaped mixer for 20-40min, then adding the additive into the industrial byproduct gypsum and mixing for 20-40 min;
b. after being uniformly mixed, the mixture is pressed into raw gypsum blocks by a press machine, and the raw gypsum blocks are stacked on a still kettle carrier;
c. feeding the autoclave carrier into a horizontal autoclave for autoclave dehydration to obtain a semi-finished product;
d. and (3) drawing the dehydrated semi-finished product to a drying kiln for drying, and crushing the dried semi-finished product to obtain the alpha high-strength gypsum powder.
2. The process for producing alpha high-strength gypsum powder by using industrial by-product gypsum according to claim 1, characterized in that: in the step a, the industrial by-product gypsum is obtained by performing desulfurization and purification treatment on flue gas generated after combustion of sulfur-containing fuel.
3. The process for producing alpha high-strength gypsum powder by using industrial by-product gypsum according to claim 1, characterized in that: in the step a, the mass ratio of the industrial by-product gypsum to the additive is 100: 0.7-4.
4. The process for producing alpha high-strength gypsum powder by using industrial by-product gypsum according to claim 1, characterized in that: in the step a, the additive is prepared by mixing the following raw materials in parts by mass: 1-10 parts of a crystal modifier, 1-10 parts of a binder and 5-20 parts of a high-efficiency water reducing agent.
5. The process for producing alpha high-strength gypsum powder by using industrial by-product gypsum according to claim 4, characterized in that: the crystallization regulator is prepared by mixing sodium citrate, aluminum sulfate and sulfonated melamine according to the mass ratio of 1:1: 2.
6. The process for producing alpha high-strength gypsum powder by using industrial by-product gypsum according to claim 4, characterized in that: the binder is lignosulfonate.
7. The process for producing alpha high-strength gypsum powder by using industrial by-product gypsum according to claim 4, characterized in that: the high-efficiency water reducing agent is a polycarboxylic acid water reducing agent polymerized by HPEG with the relative molecular weight of 3600 and acrylic acid, and the acid-ether ratio of the high-efficiency water reducing agent is 4: 1.
8. the process for producing alpha high-strength gypsum powder by using industrial by-product gypsum according to claim 1, characterized in that: in the step d, the drying temperature is 100-.
9. The process for producing alpha high-strength gypsum powder by using industrial by-product gypsum according to any one of claims 1 to 8, wherein: in the step b, the shape of the gypsum block is granular, and the diameter of the granular is 30-50mm, and the height of the granular is 50-100 mm.
10. The process for producing alpha high-strength gypsum powder by using industrial by-product gypsum according to any one of claims 1 to 8, wherein: in the step b, the gypsum block is in the shape of a block body, the length of the block body is 20-25mm, the width is 4-8mm, and the height is 10-15 mm.
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Application publication date: 20211008 |