CN111548038A - Method for adjusting cement performance by using multisource industrial byproduct gypsum - Google Patents
Method for adjusting cement performance by using multisource industrial byproduct gypsum Download PDFInfo
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- CN111548038A CN111548038A CN202010334033.5A CN202010334033A CN111548038A CN 111548038 A CN111548038 A CN 111548038A CN 202010334033 A CN202010334033 A CN 202010334033A CN 111548038 A CN111548038 A CN 111548038A
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- CN
- China
- Prior art keywords
- gypsum
- desulfurized
- cement
- phosphogypsum
- coal ash
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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
- C04B11/28—Mixtures thereof with other inorganic cementitious materials
- C04B11/30—Mixtures thereof with other inorganic cementitious materials with hydraulic cements, e.g. Portland 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
- 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
-
- 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
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a method for adjusting cement performance by using multisource industrial byproduct gypsum, which belongs to the technical field of methods for adjusting cement performance, and is characterized in that crushed phosphogypsum, steel plant desulfurized gypsum, desulfurized coal ash in a power plant furnace and mirabilite gypsum are firstly put into a stirrer to be stirred for 10-20 min; putting the cement into a stirrer, heating to 40-60 ℃, adding soft water into the stirrer, and stirring for 2-3 h; filtering and dehydrating the mixture of the stirred phosphogypsum, the desulfurized gypsum of the steel plant, the desulfurized coal ash in the furnace of the power plant and the mirabilite gypsum and the cement; air-drying and airing the mixture of the filtered and dehydrated phosphogypsum, the desulfurized gypsum of a steel mill, desulfurized coal ash in a power plant furnace and mirabilite gypsum and cement; the phosphogypsum, the steel mill desulfurized gypsum, the power plant furnace desulfurized coal ash and the mixture of the mirabilite gypsum and the cement are put into a granulator for granulation, so that the secondary utilization of the industrial gypsum is realized, the resource is saved, and the environment is protected.
Description
Technical Field
The invention relates to a method for adjusting cement performance by using industrial byproduct gypsum, in particular to a method for adjusting cement performance by using multisource industrial byproduct gypsum, belonging to the technical field of methods for adjusting cement performance.
Background
Generally, when cement is hydrated, gypsum (CaSO4.xH2O) in the cement is quickly dissolved in water to form a CaSO4.2H2O saturated solution, and the saturated solution reacts with Ca (OH)2 and hydrated aluminum phases generated by hydration of C3A to generate ettringite, the ettringite is covered on the surfaces of cement particles to form a coating film, water molecules and other ions are prevented from diffusing to the coated cement particles, so that the continuous hydration of the cement particles, particularly C3A minerals, is a retarding mechanism of the gypsum in the cement hydration process, comprehensively considers the characteristics of various gypsum minerals, and the gypsum which takes dihydrate gypsum (CaSO4.2H2O) with proper solubility and dissolution rate as main constituent minerals is more commonly used as a cement retarder.
The industrial by-product gypsum and the natural gypsum are mainly dihydrate gypsum, and theoretically, the industrial by-product gypsum can completely replace the natural dihydrate gypsum to be used as a cement retarder. However, the industrial by-product gypsum is different from natural dihydrate gypsum in chemical composition, gypsum mineral type, total impurity type and content due to process variation, and thus is greatly different from natural dihydrate gypsum in solubility characteristics and interaction with cement clinker minerals.
Based on the influence of multisource industrial by-product gypsum on the hydration process and the performance of cement and the self-generating characteristics of various industrial by-product gypsum, researches find that the retarder prepared by multisource industrial by-product gypsum can break through the respective defects and shortcomings of the multisource industrial by-product gypsum and simultaneously play a synergistic effect, so that a method for adjusting the performance of cement by using multisource industrial by-product gypsum is designed to optimize the problems.
Disclosure of Invention
The invention mainly aims to provide a method for adjusting the performance of cement by using multi-source industrial byproduct gypsum, which quantitatively weighs phosphogypsum with the water content of 10-20%, steel mill desulfurized gypsum, desulfurized coal ash residue in a power plant furnace and mirabilite gypsum; the total weight of the weighed multisource gypsum accounts for 70-95%, and the cement accounts for 5-30%; putting phosphogypsum, steel plant desulfurized gypsum, desulfurized coal ash in a power plant furnace and mirabilite gypsum into a crusher for crushing; putting the crushed phosphogypsum, steel plant desulfurized gypsum, desulfurized coal ash in a power plant furnace and mirabilite gypsum into a stirrer and stirring for 10-20 min; putting the cement into a stirrer, heating to 40-60 ℃, adding soft water into the stirrer, and stirring for 2-3 h; filtering and dehydrating the mixture of the stirred phosphogypsum, the desulfurized gypsum of the steel plant, the desulfurized coal ash in the furnace of the power plant and the mirabilite gypsum and the cement; air-drying and airing the mixture of the filtered and dehydrated phosphogypsum, the desulfurized gypsum of a steel mill, desulfurized coal ash in a power plant furnace and mirabilite gypsum and cement; the phosphogypsum, the steel mill desulfurized gypsum, the power plant furnace desulfurized coal ash and the mixture of the mirabilite gypsum and the cement are put into a granulator for granulation, so that the secondary utilization of the industrial gypsum is realized, the resource is saved, and the environment is protected.
The purpose of the invention can be achieved by adopting the following technical scheme: a method for adjusting cement performance by using multisource industrial byproduct gypsum comprises the following steps:
step 1: quantitatively weighing phosphogypsum with the water content of 10-20%, steel mill desulfurized gypsum, desulfurized coal ash residue in a power plant furnace and mirabilite gypsum; the total weight of the weighed multisource gypsum accounts for 70-95%, and the cement accounts for 5-30%;
step 2: putting phosphogypsum, steel plant desulfurized gypsum, desulfurized coal ash in a power plant furnace and mirabilite gypsum into a crusher for crushing;
and step 3: putting the crushed phosphogypsum, steel plant desulfurized gypsum, desulfurized coal ash in a power plant furnace and mirabilite gypsum into a stirrer and stirring for 10-20 min;
and 4, step 4: putting the cement into a stirrer, heating to 40-60 ℃, adding soft water into the stirrer, and stirring for 2-3 h;
and 5: filtering and dehydrating the mixture of the stirred phosphogypsum, the desulfurized gypsum of the steel plant, the desulfurized coal ash in the furnace of the power plant and the mirabilite gypsum and the cement;
step 6: air-drying and airing the mixture of the filtered and dehydrated phosphogypsum, the desulfurized gypsum of a steel mill, desulfurized coal ash in a power plant furnace and mirabilite gypsum and cement;
and 7: putting the phosphogypsum, the desulfurized gypsum of the steel plant, the desulfurized coal ash in the power plant furnace and the mixture of the mirabilite gypsum and the cement into a granulator for granulation.
Preferably, the step 1 is carried out by adopting an electronic weighing mode, and phosphogypsum, steel plant desulfurization gypsum, desulfurization coal ash in a power plant furnace and mirabilite gypsum are mixed in a ratio of 1:2:1: 2.
Preferably, in the step 2, after the phosphogypsum, the steel mill desulfurized gypsum, the power plant furnace desulfurized coal ash and the mirabilite gypsum are crushed, soft water is put into the crusher for washing, and the washed mixture is put into the stirrer.
Preferably, the rotation speed of the stirrer in the step 3 is 300-.
Preferably, step 5 is carried out by pouring into a high-speed centrifugal machine for spin-drying.
Preferably, the step 6 adopts natural air drying when airing.
Preferably, a twin screw granulator is used for granulation in step 7. The invention has the beneficial technical effects that: quantitatively weighing phosphogypsum with the water content of 10-20%, steel mill desulfurized gypsum, desulfurized coal ash residue in a power plant furnace and mirabilite gypsum; the total weight of the weighed multisource gypsum accounts for 70-95%, and the cement accounts for 5-30%; putting phosphogypsum, steel plant desulfurized gypsum, desulfurized coal ash in a power plant furnace and mirabilite gypsum into a crusher for crushing; putting the crushed phosphogypsum, steel plant desulfurized gypsum, desulfurized coal ash in a power plant furnace and mirabilite gypsum into a stirrer and stirring for 10-20 min; putting the cement into a stirrer, heating to 40-60 ℃, adding soft water into the stirrer, and stirring for 2-3 h; filtering and dehydrating the mixture of the stirred phosphogypsum, the desulfurized gypsum of the steel plant, the desulfurized coal ash in the furnace of the power plant and the mirabilite gypsum and the cement; air-drying and airing the mixture of the filtered and dehydrated phosphogypsum, the desulfurized gypsum of a steel mill, desulfurized coal ash in a power plant furnace and mirabilite gypsum and cement; the phosphogypsum, the steel mill desulfurized gypsum, the power plant furnace desulfurized coal ash and the mixture of the mirabilite gypsum and the cement are put into a granulator for granulation, so that the secondary utilization of the industrial gypsum is realized, the resource is saved, and the environment is protected.
Detailed Description
In order to make the technical solutions of the present invention more clear and definite for those skilled in the art, the present invention is further described in detail with reference to the following examples, but the embodiments of the present invention are not limited thereto.
The method for adjusting the performance of the cement by using the multisource industrial byproduct gypsum provided by the embodiment comprises the following steps:
step 1: quantitatively weighing phosphogypsum with the water content of 10-20%, steel mill desulfurized gypsum, desulfurized coal ash residue in a power plant furnace and mirabilite gypsum; the total weight of the weighed multisource gypsum accounts for 70-95%, and the cement accounts for 5-30%;
step 2: putting phosphogypsum, steel plant desulfurized gypsum, desulfurized coal ash in a power plant furnace and mirabilite gypsum into a crusher for crushing;
and step 3: putting the crushed phosphogypsum, steel plant desulfurized gypsum, desulfurized coal ash in a power plant furnace and mirabilite gypsum into a stirrer and stirring for 10-20 min;
and 4, step 4: putting the cement into a stirrer, heating to 40-60 ℃, adding soft water into the stirrer, and stirring for 2-3 h;
and 5: filtering and dehydrating the mixture of the stirred phosphogypsum, the desulfurized gypsum of the steel plant, the desulfurized coal ash in the furnace of the power plant and the mirabilite gypsum and the cement;
step 6: air-drying and airing the mixture of the filtered and dehydrated phosphogypsum, the desulfurized gypsum of a steel mill, desulfurized coal ash in a power plant furnace and mirabilite gypsum and cement;
and 7: putting the phosphogypsum, the desulfurized gypsum of the steel plant, the desulfurized coal ash in the power plant furnace and the mixture of the mirabilite gypsum and the cement into a granulator for granulation.
In the embodiment, the electronic weighing method is adopted in the step 1 for weighing, and the phosphogypsum, the steel mill desulfurized gypsum, the power plant in-furnace desulfurized coal ash and the mirabilite gypsum are mixed in a ratio of 1:2:1: 2.
In this example, in step 2, after the phosphogypsum, the steel mill desulfurized gypsum, the power plant furnace desulfurized coal ash and the mirabilite gypsum are crushed, the crusher is thrown with soft water for washing, and the washed mixture is thrown into the mixer.
In this embodiment, the rotation speed of the stirrer in step 3 is 300-.
In the embodiment, step 5 is carried out by pouring into a high-speed centrifugal machine for spin-drying.
In this embodiment, natural air drying is adopted in the step 6 when air drying is performed.
In this example, a twin screw granulator is used for granulation in step 7.
The above description is only for the purpose of illustrating the present invention and is not intended to limit the scope of the present invention, and any person skilled in the art can substitute or change the technical solution of the present invention and its conception within the scope of the present invention.
Claims (7)
1. A method for adjusting cement performance by using multisource industrial byproduct gypsum is characterized by comprising the following steps:
step 1: quantitatively weighing phosphogypsum with the water content of 10-20%, steel mill desulfurized gypsum, desulfurized coal ash residue in a power plant furnace and mirabilite gypsum; the total weight of the weighed multisource gypsum accounts for 70-95%, and the cement accounts for 5-30%;
step 2: putting phosphogypsum, steel plant desulfurized gypsum, desulfurized coal ash in a power plant furnace and mirabilite gypsum into a crusher for crushing;
and step 3: putting the crushed phosphogypsum, steel plant desulfurized gypsum, desulfurized coal ash in a power plant furnace and mirabilite gypsum into a stirrer and stirring for 10-20 min;
and 4, step 4: putting the cement into a stirrer, heating to 40-60 ℃, adding soft water into the stirrer, and stirring for 2-3 h;
and 5: filtering and dehydrating the mixture of the stirred phosphogypsum, the desulfurized gypsum of the steel plant, the desulfurized coal ash in the furnace of the power plant and the mirabilite gypsum and the cement;
step 6: air-drying and airing the mixture of the filtered and dehydrated phosphogypsum, the desulfurized gypsum of a steel mill, desulfurized coal ash in a power plant furnace and mirabilite gypsum and cement;
and 7: putting the phosphogypsum, the desulfurized gypsum of the steel plant, the desulfurized coal ash in the power plant furnace and the mixture of the mirabilite gypsum and the cement into a granulator for granulation.
2. The method for adjusting the performance of the cement by using the multi-source industrial byproduct gypsum according to claim 1, wherein the step 1 is carried out by electronic weighing, and phosphogypsum, steel mill desulfurized gypsum, desulfurized coal ash in a power plant furnace and mirabilite gypsum are mixed in a ratio of 1:2:1: 2.
3. The method of claim 1, wherein in step 2, after the phosphogypsum, the steel plant desulfurized gypsum, the power plant furnace desulfurized coal ash and the mirabilite gypsum are crushed, soft water is thrown into the crusher for washing, and the washed mixture is thrown into the stirrer.
4. The method as claimed in claim 1, wherein the rotation speed of the mixer in step 3 is 300-.
5. The method for adjusting cement properties by using multi-source industrial byproduct gypsum according to claim 1, wherein the step 5 is performed by pouring into a high-speed centrifugal machine for spin-drying.
6. The method for adjusting cement performance by using multi-source industrial byproduct gypsum according to claim 1, wherein natural air drying is adopted in the step 6 during air drying.
7. The method for adjusting cement properties by using multi-source industrial byproduct gypsum according to claim 1, wherein a twin screw granulator is used in the granulation in step 7.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010334033.5A CN111548038A (en) | 2020-04-24 | 2020-04-24 | Method for adjusting cement performance by using multisource industrial byproduct gypsum |
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| CN202010334033.5A CN111548038A (en) | 2020-04-24 | 2020-04-24 | Method for adjusting cement performance by using multisource industrial byproduct gypsum |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1887773A (en) * | 2006-07-28 | 2007-01-03 | 宁夏建筑材料研究院 | Cement retardant and its production process |
| CN1958505A (en) * | 2006-11-29 | 2007-05-09 | 北京朗新明环保科技有限公司 | Retarding agent of cement, and forming method |
| CN101519896A (en) * | 2009-04-08 | 2009-09-02 | 四川方大新型建材科技开发有限责任公司 | Vapor-pressing plaster brick and preparation method thereof |
| CN101544015A (en) * | 2009-04-20 | 2009-09-30 | 四川白马循环流化床示范电站有限责任公司 | Method for inhibiting expansion of fluidized bed combustion coal ash/slag products |
| CN102010173A (en) * | 2010-11-15 | 2011-04-13 | 重庆大学 | Method for preparing heat insulation anti-cracking raw soil bricks |
| CN102442792A (en) * | 2010-10-12 | 2012-05-09 | 廉慧珍 | Method for preparing low shrinkage-expansion cement (cement concrete expansion agent) by using calcium-base desulphurization product and fluidized bed coal-fired furnace ashes |
| CN103232214A (en) * | 2013-05-28 | 2013-08-07 | 牡丹江光明新型墙体材料有限公司 | Mortar dry powder for building and plastering |
-
2020
- 2020-04-24 CN CN202010334033.5A patent/CN111548038A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1887773A (en) * | 2006-07-28 | 2007-01-03 | 宁夏建筑材料研究院 | Cement retardant and its production process |
| CN1958505A (en) * | 2006-11-29 | 2007-05-09 | 北京朗新明环保科技有限公司 | Retarding agent of cement, and forming method |
| CN101519896A (en) * | 2009-04-08 | 2009-09-02 | 四川方大新型建材科技开发有限责任公司 | Vapor-pressing plaster brick and preparation method thereof |
| CN101544015A (en) * | 2009-04-20 | 2009-09-30 | 四川白马循环流化床示范电站有限责任公司 | Method for inhibiting expansion of fluidized bed combustion coal ash/slag products |
| CN102442792A (en) * | 2010-10-12 | 2012-05-09 | 廉慧珍 | Method for preparing low shrinkage-expansion cement (cement concrete expansion agent) by using calcium-base desulphurization product and fluidized bed coal-fired furnace ashes |
| CN102010173A (en) * | 2010-11-15 | 2011-04-13 | 重庆大学 | Method for preparing heat insulation anti-cracking raw soil bricks |
| CN103232214A (en) * | 2013-05-28 | 2013-08-07 | 牡丹江光明新型墙体材料有限公司 | Mortar dry powder for building and plastering |
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Application publication date: 20200818 |