CN108609885B - Method for solving feeding difficulty of mirabilite gypsum used as cement retarder - Google Patents
Method for solving feeding difficulty of mirabilite gypsum used as cement retarder Download PDFInfo
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- CN108609885B CN108609885B CN201810519547.0A CN201810519547A CN108609885B CN 108609885 B CN108609885 B CN 108609885B CN 201810519547 A CN201810519547 A CN 201810519547A CN 108609885 B CN108609885 B CN 108609885B
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- mirabilite 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
- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/08—Acids or salts thereof
- C04B22/14—Acids or salts thereof containing sulfur in the anion, e.g. sulfides
- C04B22/142—Sulfates
- C04B22/147—Alkali-metal sulfates; Ammonium sulfate
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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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/20—Retarders
- C04B2103/22—Set retarders
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Inorganic Chemistry (AREA)
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- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention discloses a method for solving the problem that mirabilite gypsum is difficult to feed as a cement retarder, which aims to solve the problem that the mirabilite gypsum cannot be smoothly added in the cement production due to the powdery form, and comprises the following steps: (1) reducing the water content, (2) screening, (3) pressing balls and aging; because the water content has great influence on the bonding property of the mirabilite gypsum, the high content (more than 20 percent) can cause low balling rate or can not balling, and the moisture of the mirabilite gypsum is ensured to meet the requirements of the balling process by reducing the water content and screening, thereby reducing the production cost.
Description
Technical Field
The invention belongs to the technical field of cement production, and particularly relates to a method for solving the problem of difficult feeding of mirabilite gypsum used as a cement retarder.
Background
Industrial anhydrous sodium sulfate Na for producing mirabilite in Meishan city, Sichuan province2SO4In large-scale enterprises, about 200 ten thousand tons of tunneling byproduct glauberite slag are discharged from a mining area every year. The glauberite slag is piled in a ground dump, the glauberite is leached out repeatedly by pumping water with a water pump, the glauberite water after the glauberite is leached is conveyed to a downhole dissolution area by the water pump to produce glauberite water, and the shape of the slag is changed from block shape to powder shape after the slag is leached. The reaction formula of the glauberite slag is Na2SO4·CaSO4+H2O→Na2SO4+CaSO4·2H2Leaching O, i.e. glauberite slag, with water to separate out Na2SO4Simultaneously precipitating dihydrate gypsum CaSO4·2H2And O, the slag contains about 70 percent of dihydrate gypsum. Na in ore2SO4After being leached, CaSO4The content specific gravity is correspondingly increased to form the so-called mirabilite gypsum. The mirabilite gypsum slag is piled up in a dump for many years, occupies a large area of land and has certain influence on geological environment. Therefore, cement manufacturing enterprises can replace natural gypsum to mix the mirabilite gypsum with the cement to be used as a retarder for resource reutilization.
At present, limestone, clinker, gypsum, slag and the like adopted by cement production enterprises for cement production are blocky raw materials, and are stacked by adopting a large-capacity vertical raw material warehouse, and the raw material warehouse is generally formed by pouring reinforced concrete, such as a straight section cylindrical shape and a conical bottom shape, and the capacity is generally more than 3000 tons. The powdery raw materials are influenced by the poor material form, moisture and fluidity and cannot be directly stacked in a vertical raw material warehouse; otherwise it would clump due to gravity extrusion, resulting in severe plugging. At present, powdery raw materials can only be stacked in a traditional ground raw material warehouse, a feeding line of the powdery raw materials needs to be newly built in a batching system, and discontinuous feeding is carried out by using engineering machinery, but the feeding method has the defects of high operation cost, multiple environmental protection control points and the like.
The mirabilite gypsum is obtained by separating glauberite ore, is a brand new product and is influenced by the production process, the water content of the mirabilite gypsum product after dehydration is below 20 percent, the product is in a powdery and blocky shape, and the particle size distribution condition is as follows: the proportion of less than 10mm is 36-46%, the rest is more than 10mm, the product form is half of powder and block, therefore, the problem of difficult feeding of mirabilite gypsum exists, and the large-scale use of the mirabilite gypsum is influenced; on the other hand, the existing ball pressing process has the problems that the particle size is uneven, parameters such as moisture content and the like cannot reach the standard and the like, and the requirement of pressing the mirabilite gypsum into the balls cannot be met.
Disclosure of Invention
The invention aims to: aiming at the problems that the feeding of the mirabilite gypsum is difficult and the large-scale production and use of the mirabilite gypsum are influenced due to the fact that the mirabilite gypsum has the characteristic of excessive powdery materials in the form of the mirabilite gypsum, the invention provides a method for solving the problem that the mirabilite gypsum is difficult to feed as a cement retarder.
The technical scheme adopted by the invention is as follows:
a method for solving the feeding difficulty of mirabilite gypsum used as a cement retarder comprises the following steps:
(1) and (3) reducing the water content: reducing the water content of the mirabilite gypsum by 2-6% by mass until the mirabilite gypsum is easy to press and form into balls;
(2) screening: feeding the mirabilite gypsum with the water content reduced into a belt according to the first-in first-out principle, conveying the mirabilite gypsum to screening equipment through the belt, and respectively screening out the mirabilite gypsum with the particle size of below 10mm and above 10 mm; directly conveying the mirabilite gypsum with the grain diameter of more than 10mm to an aging warehouse through a belt, and aging for 2-7 days;
(3) pressing the ball: and (3) conveying the mirabilite gypsum screened in the step (2) with the particle size of below 10mm into a high-pressure ball forming mill through a belt for ball pressing treatment to form pellets, conveying the mirabilite gypsum after the pellets are formed into the pellets into an aging warehouse, and aging for 2-7 days.
The mass percentage of the water content of the mirabilite gypsum is reduced by 2-6 percent, so that the mirabilite gypsum is conveniently pressed into balls for molding; screening the mirabilite gypsum with the particle size of below 10mm and above 10mm respectively by screening, directly conveying the mirabilite gypsum with the particle size of above 10mm to an aging warehouse by a belt, aging for 2-7 days, and greatly improving the strength of the material after balling by the mirabilite gypsum through self-condensation; the mirabilite gypsum with the particle size of less than 10mm can be subjected to ball pressing treatment through ball pressing to form a pellet, so that the feeding of the mirabilite gypsum is facilitated, and the problem that the mirabilite gypsum is difficult to add when being used as a cement retarder is solved.
Preferably, the manner of reducing the water content in the step (1) is to convey the mirabilite gypsum to a gypsum warehouse, stack the mirabilite gypsum by a stacker, and stack the mirabilite gypsum for 7 to 35 days under the condition of normal temperature. Generally, the water content of 7 days of stacking in winter is reduced by about 2.2 percent, the water content of 7 days of stacking in summer is reduced by about 2.8 percent, and the stacking mainly aims to reduce the water content of the mirabilite gypsum as much as possible; the capacity of the gypsum warehouse ensures that mirabilite gypsum products can be stacked for 7-35 days, and the water content of the mirabilite gypsum can be reduced through natural stacking; the natural stacking mode is adopted, and meanwhile, the economic cost rise caused by the reduction of the water content of the mirabilite gypsum is avoided.
Preferably, the water content is reduced in the step (1) by reducing the water content of the mirabilite gypsum by 2-6% through a drying device. The water content of the mirabilite gypsum can be rapidly reduced to a required value through the drying equipment, the time cost is saved, and the working efficiency is improved.
Preferably, the balling line pressure of the high-pressure balling machine reaches 1000-2。
Preferably, the pellet in the step (3) has an oval shape.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. the water content has great influence on the adhesive property of the mirabilite gypsum, the high content (more than 20 percent) can cause low balling rate or can not balling, and the requirement of balling process is met by reducing the water content of the mirabilite gypsum, so that the problem of difficult feeding of the mirabilite gypsum is solved, and the problem of difficult adding of the mirabilite gypsum as a cement retarder is solved;
2. the water content of the mirabilite gypsum can be reduced through natural stacking; the natural stacking mode can avoid the increase of economic cost caused by that no waste heat can be utilized to reduce the water content of the mirabilite gypsum by adopting drying equipment;
3. the mirabilite gypsum with the particle sizes of more than 10mm and less than 10mm is separated by adopting screening equipment, and because the mirabilite gypsum with the particle size of more than 10mm meets the requirement of large-scale production, only the low-particle-size mirabilite gypsum with the particle size of less than 10mm is subjected to balling treatment, the process can reduce the balling cost;
4. the balling equipment requires that the pressure of the balling line reaches 1000-2The strength and the balling rate of the pellets are improved;
5. the high-pressure ball forming machine is used for carrying out ball pressing treatment to form the balls, the shapes of the balls are selected to be elliptical, special process treatment is required to be carried out on the ball forming surfaces to improve the smoothness, and the method is favorable for ball removal of the ball forming machine.
Detailed Description
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
Example 1
A method for solving the feeding difficulty of mirabilite gypsum used as a cement retarder comprises the following steps:
(1) and (3) reducing the water content: conveying the mirabilite gypsum to a gypsum warehouse, stacking the mirabilite gypsum by a stacker, and naturally stacking the mirabilite gypsum for 35 days at normal temperature to reduce the water content by 6%;
(2) screening: sending the stacked mirabilite gypsum into a belt according to the first-in first-out principle, conveying the mirabilite gypsum to screening equipment through the belt, and respectively screening out the mirabilite gypsum with the particle size of less than 10mm and more than 10 mm; directly conveying the mirabilite gypsum with the grain diameter of more than 10mm to an aging warehouse through a belt, and aging for 2 days;
(3) pressing the ball: and (3) conveying the mirabilite gypsum screened in the step (2) with the particle size of below 10mm into a high-pressure ball forming mill through a belt for ball pressing treatment to form pellets, conveying the mirabilite gypsum after the pellets are formed into the pellets into an aging warehouse, and aging for 2 days.
The pressure of the balling line of the high-pressure balling machine reaches 1000-2。
The pellets in the step (3) are oval.
Example 2
A method for solving the feeding difficulty of mirabilite gypsum used as a cement retarder comprises the following steps:
(1) and (3) reducing the water content: conveying the mirabilite gypsum to a gypsum warehouse, stacking the mirabilite gypsum by a stacker, and naturally stacking the mirabilite gypsum for 25 days at normal temperature to reduce the water content by 4%;
(2) screening: sending the stacked mirabilite gypsum into a belt according to the first-in first-out principle, conveying the mirabilite gypsum to screening equipment through the belt, and respectively screening out the mirabilite gypsum with the particle size of less than 10mm and more than 10 mm; directly conveying the mirabilite gypsum with the grain diameter of more than 10mm to an aging warehouse by a belt, and aging for 3 days;
(3) pressing the ball: and (3) conveying the mirabilite gypsum screened in the step (2) with the particle size of below 10mm into a high-pressure ball forming mill through a belt for ball pressing treatment to form pellets, conveying the mirabilite gypsum after the pellets are formed into the pellets into an aging warehouse, and aging for 3 days.
The pressure of the balling line of the high-pressure balling machine reaches 1000-2。
The pellets in the step (3) are oval.
Example 3
A method for solving the feeding difficulty of mirabilite gypsum used as a cement retarder comprises the following steps:
(1) and (3) reducing the water content: conveying the mirabilite gypsum to a gypsum warehouse, stacking the mirabilite gypsum by a stacker, and naturally stacking the mirabilite gypsum for 12 days at normal temperature to reduce the water content by 2.5%;
(2) screening: sending the stacked mirabilite gypsum into a belt according to the first-in first-out principle, conveying the mirabilite gypsum to screening equipment through the belt, and respectively screening out the mirabilite gypsum with the particle size of less than 10mm and more than 10 mm; directly conveying the mirabilite gypsum with the grain diameter of more than 10mm to an aging warehouse by a belt, and aging for 4 days;
(3) pressing the ball: and (3) conveying the mirabilite gypsum screened in the step (2) with the particle size of below 10mm into a high-pressure ball forming mill through a belt for ball pressing treatment to form pellets, conveying the mirabilite gypsum after the pellets are formed into the pellets into an aging warehouse, and aging for 4 days.
The pressure of the balling line of the high-pressure balling machine reaches 1000-2。
The pellets in the step (3) are oval.
Example 4
A method for solving the feeding difficulty of mirabilite gypsum used as a cement retarder comprises the following steps:
the process for pressing the mirabilite gypsum into the balls comprises the following steps:
(1) and (3) reducing the water content: reducing the water content of the mirabilite gypsum by 2 percent through drying equipment;
(2) screening: feeding the mirabilite gypsum with the reduced water content into a belt according to a first-in first-out principle, conveying the mirabilite gypsum to screening equipment through the belt, and respectively screening out the mirabilite gypsum with the particle size of below 10mm and above 10 mm; directly conveying the mirabilite gypsum with the grain diameter of more than 10mm to an aging warehouse through a belt, and aging for 5 days;
(3) pressing the ball: and (3) conveying the mirabilite gypsum screened in the step (2) with the particle size of below 10mm into a high-pressure ball forming mill through a belt for ball pressing treatment to form pellets, conveying the mirabilite gypsum after the pellets are formed into the pellets into an aging warehouse, and aging for 5 days.
The pressure of the balling line of the high-pressure balling machine reaches 1000-2。
The pellets in the step (3) are oval.
Example 5
A method for solving the feeding difficulty of mirabilite gypsum used as a cement retarder comprises the following steps:
(1) and (3) reducing the water content: reducing the water content of the mirabilite gypsum by 6 percent through drying equipment;
(2) screening: feeding the mirabilite gypsum with the reduced water content into a belt according to a first-in first-out principle, conveying the mirabilite gypsum to screening equipment through the belt, and respectively screening out the mirabilite gypsum with the particle size of below 10mm and above 10 mm; directly conveying the mirabilite gypsum with the grain diameter of more than 10mm to an aging warehouse through a belt, and aging for 7 days;
(3) pressing the ball: and (3) conveying the mirabilite gypsum screened in the step (2) with the particle size of below 10mm into a high-pressure ball forming mill through a belt for ball pressing treatment to form pellets, conveying the mirabilite gypsum after the pellets are formed into the pellets into an aging warehouse, and aging for 7 days.
The pressure of the balling line of the high-pressure balling machine reaches 1000-2。
The pellets in the step (3) are oval.
Control experiment:
control experiment 1
The procedure of example 1 was repeated, except that no anhydrite gypsum was placed in the gypsum house.
TABLE 1 Properties of pelletized Natrii sulfas Gypsum
As can be seen from table 1, the formed mirabilite gypsum pellets prepared in examples 1 to 5 have moderate water content, high agglomeration rate in the process of forming pellets, high pellet strength, uniform pellet diameter and smooth surface; in contrast experiment 1, the stacking step is not needed, so that the mirabilite gypsum has high water content, low pelletizing rate, low pellet strength and non-uniform pellet particle size.
TABLE 2 influence of aging time on pellet strength of Natrii sulfas Gypsum
Table 2 shows that the pellets of mirabilite gypsum prepared in examples 1 to 5 have a lower strength without aging and cannot meet the demand; the strength of the pellets after aging for 2 days can meet the requirement of feeding, and the strength of the pellets is gradually enhanced with the prolonging of the aging time, but the enhancing speed is gradually reduced.
Claims (5)
1. A method for solving the problem of difficult feeding of mirabilite gypsum used as a cement retarder is characterized by comprising the following steps:
(1) and (3) reducing the water content: reducing the water content of the mirabilite gypsum by 2-6% by mass until the mirabilite gypsum is easy to press and form into balls;
(2) screening: feeding the mirabilite gypsum with the water content reduced into a belt according to the first-in first-out principle, conveying the mirabilite gypsum to screening equipment through the belt, and respectively screening out the mirabilite gypsum with the particle size of below 10mm and above 10 mm; directly conveying the mirabilite gypsum with the grain diameter of more than 10mm to an aging warehouse through a belt, and aging for 2-7 days;
(3) pressing the ball: and (3) conveying the mirabilite gypsum screened in the step (2) with the particle size of below 10mm into a high-pressure ball forming mill through a belt for ball pressing treatment to form pellets, conveying the mirabilite gypsum after the pellets are formed into the pellets into an aging warehouse, and aging for 2-7 days.
2. The method for solving the feeding difficulty of mirabilite gypsum as the cement retarder according to claim 1, wherein the water content is reduced in the step (1) by conveying the mirabilite gypsum to a gypsum warehouse, stacking the mirabilite gypsum by a stacker, and stacking the mirabilite gypsum for 7-35 days under the condition of normal temperature.
3. The method for solving the feeding difficulty of the mirabilite gypsum as the cement retarder according to claim 1, wherein the water content in the step (1) is reduced by 2-6% through a drying device.
4. The method for solving the feeding difficulty of mirabilite gypsum as cement retarder according to any one of claims 1 to 3, wherein the pressure of the balling line of the high-pressure balling machine reaches 1000-2。
5. The method for solving the feeding difficulty of mirabilite gypsum as the cement retarder is characterized in that the pellets in the step (3) are oval according to any one of claims 1 to 3.
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| CN1951856A (en) * | 2006-11-08 | 2007-04-25 | 冯丽 | Ardealite cement additives |
| CN101134646A (en) * | 2007-07-25 | 2008-03-05 | 曹现强 | Application process by using chemical calcium sulfate as cement retarder |
| CN101367632A (en) * | 2008-09-26 | 2009-02-18 | 四川绵竹三佳饲料有限责任公司 | Modified ardealite setting retarder for cement and its preparing process |
| CN102531441A (en) * | 2012-02-28 | 2012-07-04 | 云南新龙矿物质饲料有限公司 | Production method and product of cement retarder from ardealite |
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2018
- 2018-05-28 CN CN201810519547.0A patent/CN108609885B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1951856A (en) * | 2006-11-08 | 2007-04-25 | 冯丽 | Ardealite cement additives |
| CN101134646A (en) * | 2007-07-25 | 2008-03-05 | 曹现强 | Application process by using chemical calcium sulfate as cement retarder |
| CN101367632A (en) * | 2008-09-26 | 2009-02-18 | 四川绵竹三佳饲料有限责任公司 | Modified ardealite setting retarder for cement and its preparing process |
| CN102531441A (en) * | 2012-02-28 | 2012-07-04 | 云南新龙矿物质饲料有限公司 | Production method and product of cement retarder from ardealite |
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