CN111348850A - Hydraulic lime and production method thereof - Google Patents
Hydraulic lime and production method thereof Download PDFInfo
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- CN111348850A CN111348850A CN201811573592.0A CN201811573592A CN111348850A CN 111348850 A CN111348850 A CN 111348850A CN 201811573592 A CN201811573592 A CN 201811573592A CN 111348850 A CN111348850 A CN 111348850A
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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
- C04B7/00—Hydraulic cements
- C04B7/34—Hydraulic lime cements; Roman cements ; natural 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
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
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Abstract
The present invention provides a hydraulic lime and a method for producing the same, the method comprising: mixing papermaking white mud and clay to prepare a raw material, controlling the mass ratio of calcium oxide to silicon oxide in the raw material to be 0.89-10.41, wherein the chemical components of the raw material comprise, by mass percent, 32.45-50.27% of calcium oxide, 4.83-36.55% of silicon oxide and no more than 4.5% of aluminum oxide; grinding and preheating the raw materials, calcining at 950-1200 ℃, cooling, digesting, drying and grinding to obtain the hydraulic lime. The method provided by the invention utilizes the papermaking white mud as a main raw material, can change the papermaking white mud into valuables, realizes reasonable utilization of resources, and is environment-friendly, short in process flow and low in production cost.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to hydraulic lime and a production method thereof.
Background
Hydraulic lime can be used as a building material, the main characteristics of which are different from lime and cement. Compared with lime, hydraulic lime has the advantages of high setting speed, good viscosity, strong adhesive force, high water resistance and high mechanical strength; compared with cement, the wall can ventilate and keep breath, is beneficial to exchange of water vapor, and has the characteristics of good freezing resistance and alkali resistance, good flexibility, good machinability, strong self-repairing capability and the like. Because the hardening rate of the hydraulic lime is slow and the hydration heat release is low, the internal stress caused by rapid curing is avoided, and the hydraulic lime has good toughness.
In foreign countries, hydraulic lime can be used to replace cement to prepare decorative mortar and fair-faced concrete, and is widely used for cultural relics protection and ancient building restoration. The introduction of hydraulic lime in China is mainly applied to the aspects of repairing and reinforcing historical buildings and the like, and can eliminate the corrosion of sulfate to the historical buildings. At present, the cost of producing the hydraulic lime in China is high, and the research on producing the hydraulic lime by using the papermaking white mud is blank.
Disclosure of Invention
In view of the deficiencies in the prior art, it is an object of the present invention to address one or more of the problems in the prior art as set forth above. For example, one of the objects of the present invention is to provide a method for producing hydraulic lime, which has a simple process and a low production cost, in order to solve the problem of high production cost of hydraulic lime in the prior art.
In order to achieve the above object, an aspect of the present invention provides a hydraulic lime production method, which may include the steps of: mixing papermaking white mud and clay to prepare a raw material, controlling the mass ratio of calcium oxide to silicon oxide in the raw material to be 0.89-10.41, wherein the chemical components of the raw material comprise, by mass percent, 32.45-50.27% of calcium oxide, 4.83-36.55% of silicon oxide and no more than 4.5% of aluminum oxide; grinding and preheating the raw materials, calcining at 950-1200 ℃, cooling, digesting, drying and grinding to obtain the hydraulic lime.
In an exemplary embodiment of the hydraulic lime production method of the present invention, the calcination temperature may be 980 to 1100 ℃, the temperature increase rate of the calcination may be 5 to 50 ℃/min, and the calcination time may not exceed 1 hour.
In an exemplary embodiment of the hydraulic lime production process of the present invention, the digesting may include measuring the content of free calcium oxide in the product after calcination and cooling, circulating the digestion in an environment having a humidity of 50% to 90%, recording the weight change of the product before and after the digestion, and ending the digestion in the case where the free calcium oxide digestibility in the product reaches 98%.
In an exemplary embodiment of the hydraulic lime production method of the present invention, the preheating temperature may be 750 to 900 ℃ and the preheating time may be 0.5 to 1 hour.
In an exemplary embodiment of the hydraulic lime production method of the present invention, the particle size of the hydraulic lime may not exceed 2% by 0.2mm of the screen allowance, and may not exceed 15% by 0.09mm of the screen allowance.
In one exemplary embodiment of the hydraulic lime production method of the present invention, the content of calcium hydroxide in the hydraulic lime may be 15% to 78% and the content of sulfur trioxide may not exceed 2% by mass percentage.
In an exemplary embodiment of the method for producing hydraulic lime of the present invention, the method may prepare hydraulic lime having different compressive strengths by controlling a mass ratio of calcium oxide to silicon oxide in the raw materials, wherein the mass ratio of calcium oxide to silicon oxide is controlled to 0.89 to 1.15, the compressive strength of the prepared hydraulic lime ranges from 5MPa to 15MPa for 28 days of curing, and the content of calcium hydroxide in the hydraulic lime is not less than 15%; controlling the mass ratio of calcium oxide to silicon oxide to be more than 1.15 and less than 1.45, wherein the compressive strength range of the prepared hydraulic lime after curing for 28 days is 3.5MPa to 10MPa, and the content of calcium hydroxide in the hydraulic lime is not less than 25 percent; the mass ratio of the calcium oxide to the silicon oxide is controlled to be 1.45-10.41, the compressive strength range of the hydraulic lime obtained by curing the prepared hydraulic lime for 28 days is 2.0-7.0 MPa, and the content of calcium hydroxide in the hydraulic lime is not lower than 35%.
In an exemplary embodiment of the hydraulic lime production method of the present invention, the chemical composition of the papermaking white mud may include, in mass percent, 33.5% to 55.0% of calcium oxide, 0% to 10% of silicon oxide, and 0% to 10% of magnesium oxide.
In an exemplary embodiment of the hydraulic lime production method of the present invention, the silica contained in the clay may be not less than 40% by mass.
Another aspect of the present invention provides a hydraulic lime produced by the above-described hydraulic lime production method, the hydraulic lime including 15% to 78% by mass of calcium hydroxide and not more than 2% by mass of sulfur trioxide, the hydraulic lime having a 0.2mm screen residue of not more than 2% and a 0.09mm screen residue of not more than 15%.
Compared with the prior art, the method of the invention uses the papermaking white mud as the main raw material, can change the papermaking white mud into valuable, realizes the reasonable utilization of resources, is environment-friendly, has short process flow and low production cost, can be widely applied to the aspects of cultural relics protection, ancient building restoration, historical building restoration and reinforcement and the like, has good flexibility and constructability, good viscosity and strong adhesive force to a wall body, can ensure that the wall body can ventilate and keep breath, is favorable for the exchange of water vapor, has higher waterproofness, good self-repairability, good frost resistance, good salt resistance, low price, good economy and the like.
Drawings
The above and other objects and features of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings, in which:
fig. 1 shows a schematic flow diagram of a hydraulic lime production process according to an exemplary embodiment of the present invention.
Detailed Description
Hereinafter, a hydraulic lime and a method for producing the same according to the present invention will be described in detail with reference to the accompanying drawings and exemplary embodiments.
Generally, in the pulping and papermaking process, the silicon content in the white mud is high, and if the white mud is recycled, the silicon interference of alkali recovery is increased, so that the alkali recovery cannot normally operate. Therefore, the white mud can not be properly treated all the time, and can be either removed to fill a pit for paving or directly discharged into rivers, thereby not only causing environmental pollution, but also paying certain pollution discharge cost. The inventor discovers through research that the papermaking white mud and clay are mixed according to a certain proportion to serve as raw materials, and the papermaking white mud can be changed into valuable materials by matching with corresponding production process steps and parameters, so that the hydraulic lime is produced.
Fig. 1 shows a process flow diagram of a method of preparing hydraulic lime according to an exemplary embodiment of the present invention.
An aspect of the present invention provides a hydraulic lime production method, which, in an exemplary embodiment of the hydraulic lime production method of the present invention, as shown in fig. 1, includes:
and step S01, batching.
In this example, the chemical content of the raw materials must be strictly controlled in order to ensure that the required performance of the hydraulic lime is satisfied. The invention utilizes papermaking white mud as a main raw material, and clay is added and mixed to prepare the raw material for producing the hydraulic lime. The mass ratio of calcium oxide to silicon oxide in the raw material may be 0.89 to 10.41. The formation components of the mixed raw material prepared from the papermaking white mud and the clay comprise, by mass, 32.45% -50.27% of calcium oxide, 4.83% -36.55% of silicon oxide and no more than 4.5% of aluminum oxide. Furthermore, the formation components of the raw materials after the papermaking white mud and the clay are prepared and mixed can comprise, by mass percent, 35% -48% of calcium oxide, 5.0% -35% of silicon oxide and no more than 4.0% of aluminum oxide, and the others are common substances contained in some papermaking white mud and clay.
In this embodiment, the ratio of the papermaking white clay to the clay is controlled, that is, the ratio of calcium oxide to silicon oxide in the raw material is controlled, so that products with different compressive strength performances can be obtained. When the ratio of calcium oxide to silicon oxide is about 0.89 to 1.15, the compressive strength of the hydraulic lime which can be prepared and cured for 28 days is in the range of (5MPa, 15 MPa). When the ratio of calcium oxide to silicon oxide is greater than about 1.15 and less than about 1.45, the hydraulic lime can be prepared to have a compressive strength in the range of (3.5MPa, 10MPa) for 28 days of curing. When the ratio of calcium oxide to silicon oxide is about 1.45-10.41, the compressive strength of the hydraulic lime prepared by curing for 28 days is in the range of (2.0MPa, 7.0 MPa). And the calcium hydroxide content in the hydraulic lime obtained by different calcium oxide-silicon oxide content ratios is the same. For example, when the ratio of calcium oxide to silicon oxide is about 0.89 to 1.15, the content of calcium hydroxide is not less than 15%; when the ratio of calcium oxide to silicon oxide is 1.15-1.45, the content of calcium hydroxide is not lower than 25%; when the ratio of calcium oxide to silicon oxide is 1.45-10.41, the content of calcium hydroxide is not less than 35%. The weight ratio of the calcium oxide to the silicon oxide is set to be 0.89-10.41, so that if the weight ratio is lower than the set lower limit or exceeds the set upper limit, the content of the calcium hydroxide in the hydraulic lime prepared by production cannot meet the requirement, and the product performance is influenced.
In this embodiment, the main chemical components of the papermaking white mud may include, by mass, 33.5% to 55.0% of calcium oxide, 0% to 10% of silicon oxide, 0% to 10% of magnesium oxide, and the others are conventional components contained in papermaking white mud. Of course, the papermaking white mud used in the present invention is not limited thereto, and a commercially available or natural papermaking white mud may be used.
In this embodiment, the clay may be silica not less than 40% by mass.
And step S02, grinding and preheating the raw materials, calcining at 950-1200 ℃, cooling, digesting, drying and grinding to obtain the hydraulic lime.
In this embodiment, after the raw materials are prepared, the raw materials need to be ground. The grinding method is not limited, and for example, the raw material may be ground using a ball mill. The powder can be ground for 1-3 hours. After the grinding is finished, the ground raw materials can be screened, for example, the raw materials can be sieved by a sieve of 160-190 meshes. The raw materials can be more favorably calcined by grinding the raw materials, so that a better reaction effect is achieved.
In this embodiment, the preheating temperature of the raw material may be 750 to 900 ℃, preferably 800 to 880 ℃, for example 850 ℃. The preheating time can be determined according to the amount of the raw materials on site, for example, in order to save energy consumption and achieve a good preheating effect, the preheating time can be 0.5 to 1 hour.
In this embodiment, the calcination temperature may be preferably 950 to 1100 ℃, for example, 1040 ℃. The temperature rise speed of the calcination can be 5 ℃/min to 50 ℃/min, and the calcination time is not more than 1 hour. Preferably, the temperature rise rate of the calcination can be 10 ℃/min to 40 ℃/min. The calcination may be carried out using a shaft kiln or a tunnel kiln. The calcination has the advantage of ensuring the reaction between calcium oxide and silicon dioxide, and the calcination holding time is longer when the reaction is complete as the temperature rise speed is higher, and the holding time is shorter as the temperature rise speed is lower.
In this embodiment, the cooling may be performed naturally in air to room temperature.
In this example, digestion of the product is required after cooling is complete. The digestion may include measuring the content of free calcium oxide in the cooled product after the product is cooled, circulating the product in an environment with a humidity of 50% to 90%, recording the weight change of the product before and after the digestion, and ending the digestion when the digestibility of the free calcium oxide in the product reaches 98%.
In this embodiment, after the digestion of the product is completed, the digested product may be dried and ground to obtain a desired particle size. The temperature and time of drying, the manner and time of grinding can be empirical or determined on site. For example, the milling may be performed by a ball mill, and the milling time may be 1 to 3 hours. Of course, the grinding of the present invention is not limited thereto. After the grinding is finished, the granularity of the product hydraulic lime meets the requirement that the 0.2mm sieve residue is not more than 2 percent, and the 0.09mm sieve residue is not more than 15 percent. For example, the 0.09mm screen allowance may be 5% to 15%. The bulk density of the hydraulic lime may be 453kg/m3-595kg/m3。
In this embodiment, the content of calcium hydroxide in the hydraulic lime is 15% to 78% and the content of sulfur trioxide is not more than 2% by mass.
In this example, the compressive strength of the hydraulic lime in standard curing for 7 days can reach 0.4MPa to 7.5MPa, and the compressive strength in standard curing for 28 days can reach 2.0MPa to 20 MPa.
In another aspect of the present invention, there is provided a hydraulic lime, which, in an exemplary embodiment of the hydraulic lime of the present invention, may be prepared by the above-described hydraulic lime preparation method. The hydraulic lime can comprise 15-78% of calcium hydroxide and not more than 2% of sulfur trioxide by mass percent, the compressive strength of the hydraulic lime after standard curing for 7 days can reach 0.4-7.5 MPa, and the compressive strength of the hydraulic lime after standard curing for 28 days can reach 2.0-20 MPa.
In this embodiment, the hydraulic lime may have a 0.2mm screen residue of not more than 2%, and a 0.09mm screen residue of not more than 15%. For example, the 0.09mm screen allowance may be 5% to 15%.
In order that the above-described exemplary embodiments of the invention may be better understood, further description thereof with reference to specific examples is provided below.
Example 1
1) Mixing papermaking white mud and clay according to the mass ratio of the required calcium oxide to the required silicon oxide of 0.89;
2) grinding the raw materials for 1.5 hours until the balance of the raw materials is 2 percent through a 180-mesh sieve;
3) preheating and decomposing the raw material in a high-temperature furnace at 900 ℃ for 0.5 hour;
4) calcining at 1050 ℃ for 0.5 hour after preheating and decomposing; after calcination, naturally cooling to room temperature, and measuring the content of free calcium oxide;
5) digesting in an environment with the humidity of 65%, recording the weight change of the product before and after digestion, and finishing digestion when the digestibility of free calcium oxide in the product reaches 98%;
6) after the digestion and the drying, the powder is ground for 2.3 hours, and when the residue of the 0.2mm sieve is not more than 2 percent and the residue of the 0.09mm sieve is not more than 15 percent, the hydraulic lime is prepared.
Example 2
1) Mixing papermaking white mud and clay according to the mass ratio of the required calcium oxide to the required silicon oxide of 1.0;
2) grinding the raw materials for 1.5 hours until the balance of the raw materials is 2 percent through a 180-mesh sieve;
3) preheating and decomposing the raw material in a high-temperature furnace at 900 ℃ for 0.5 hour;
4) calcining at 1050 ℃ for 0.5 hour after preheating and decomposing; after calcination, naturally cooling to room temperature, and measuring the content of free calcium oxide;
5) digesting in an environment with the humidity of 65%, recording the weight change of the product before and after digestion, and finishing digestion when the digestibility of free calcium oxide in the product reaches 98%;
6) after the digestion and the drying, the mixture is ground for 2.3 hours, when the residue of the 0.2mm sieve is not more than 2 percent and the residue of the 0.09mm sieve is not more than 15 percent, the hydraulic lime is prepared
Example 3
1) Mixing papermaking white mud and clay according to the required mass ratio of calcium oxide to silicon oxide of 1.20;
2) grinding the raw materials for 1.5 hours until the balance of the raw materials is 2 percent through a 180-mesh sieve;
3) preheating and decomposing the raw material in a high-temperature furnace at 850 ℃ for 0.5 hour;
4) calcining at 1050 ℃ for 0.5 hour after preheating and decomposing; after calcination, naturally cooling to room temperature, and measuring the content of free calcium oxide;
5) digesting in an environment with the humidity of 65%, recording the weight change of the product before and after digestion, and finishing digestion when the digestibility of free calcium oxide in the product reaches 98%;
6) after the digestion and the drying, the mixture is ground for 2.3 hours, when the residue of the 0.2mm sieve is not more than 2 percent and the residue of the 0.09mm sieve is not more than 15 percent, the hydraulic lime is prepared
Example 4
1) Mixing papermaking white mud and clay according to the required mass ratio of calcium oxide to silicon oxide of 1.5;
2) grinding the raw materials for 1.5 hours until the balance of the raw materials is 2 percent through a 180-mesh sieve;
3) preheating and decomposing the raw material in a high-temperature furnace at 900 ℃ for 0.5 hour;
4) calcining at 1100 deg.C for 0.5 hr after preheating and decomposing; after calcination, naturally cooling to room temperature, and measuring the content of free calcium oxide;
5) digesting in an environment with the humidity of 65%, recording the weight change of the product before and after digestion, and finishing digestion when the digestibility of free calcium oxide in the product reaches 98%;
6) after the digestion and the drying, the mixture is ground for 2.3 hours, when the residue of the 0.2mm sieve is not more than 2 percent and the residue of the 0.09mm sieve is not more than 15 percent, the hydraulic lime is prepared
Example 5
1) Mixing papermaking white mud and clay according to the required mass ratio of calcium oxide to silicon oxide of 2.5;
2) grinding the raw materials for 1.5 hours until the balance of the raw materials is 2 percent through a 180-mesh sieve;
3) preheating and decomposing the raw material in a high-temperature furnace at 900 ℃ for 0.5 hour;
4) calcining at 1100 deg.C for 0.5 hr after preheating and decomposing; after calcination, naturally cooling to room temperature, and measuring the content of free calcium oxide;
5) digesting in an environment with the humidity of 65%, recording the weight change of the product before and after digestion, and finishing digestion when the digestibility of free calcium oxide in the product reaches 98%;
6) after the digestion and the drying, the mixture is ground for 2.3 hours, when the residue of the 0.2mm sieve is not more than 2 percent and the residue of the 0.09mm sieve is not more than 15 percent, the hydraulic lime is prepared
Example 6
1) Mixing papermaking white mud and clay according to the required mass ratio of calcium oxide to silicon oxide of 10.41;
2) grinding the raw materials for 1.5 hours until the balance of the raw materials is 2 percent through a 180-mesh sieve;
3) preheating and decomposing the raw material in a high-temperature furnace at 900 ℃ for 0.5 hour;
4) calcining at 1150 deg.C for 0.5 hr after preheating and decomposing; after calcination, naturally cooling to room temperature, and measuring the content of free calcium oxide;
5) digesting in an environment with the humidity of 65%, recording the weight change of the product before and after digestion, and finishing digestion when the digestibility of free calcium oxide in the product reaches 98%;
6) after the digestion and the drying, the mixture is ground for 2.3 hours, when the residue of the 0.2mm sieve is not more than 2 percent and the residue of the 0.09mm sieve is not more than 15 percent, the hydraulic lime is prepared
The compressive strength of the hydraulic lime is tested, 450 +/-2 g of the hydraulic lime, 1350 +/-5 g of standard sand and 270 +/-1 g of water are weighed, the water-cement ratio is determined according to the loose bulk density of the hydraulic lime, a standard sample of 40mm × 40mm × 160mm is prepared, the prepared sample is maintained in a constant temperature and humidity standard maintenance box, and various indexes of the hydraulic lime are respectively tested.
The properties of the hydraulic limes of examples 1 to 6 are shown in Table 1:
TABLE 1
| Examples of the invention | Bulk Density (kg/m)3) | 7d/MPa | 28d/MPa | Ca(OH)2(wt％) |
| 1 | 568 | 3.7 | 15.0 | 15.2 |
| 2 | 548 | 2.9 | 10.5 | 21.2 |
| 3 | 523 | 2.6 | 7.1 | 28.5 |
| 4 | 496 | 1.8 | 3.2 | 37.9 |
| 5 | 532 | 1.1 | 2.7 | 50.5 |
| 6 | 586 | 1.2 | 2.0 | 79.1 |
In conclusion, the method of the invention uses the papermaking white mud as the main raw material, can change the papermaking white mud into valuable, realizes the reasonable utilization of resources, is environment-friendly, has short process flow and low production cost, can be widely applied to the aspects of cultural relics protection, ancient building restoration, historical building restoration and reinforcement and the like, has the advantages of good flexibility and construction property, good viscosity, strong adhesion to a wall body, higher water resistance, good self-restoration property, good frost resistance, good salt resistance, low price, good economy and the like, and can ensure that the wall body can keep air permeability and breath to be favorable for the exchange of water vapor.
Although the present invention has been described above in connection with exemplary embodiments, it will be apparent to those skilled in the art that various modifications and changes may be made to the exemplary embodiments of the present invention without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A process for the production of hydraulic lime, characterized in that it comprises the following steps:
mixing papermaking white mud and clay to prepare a raw material, controlling the mass ratio of calcium oxide to silicon oxide in the raw material to be 0.89-10.41, wherein the chemical components of the raw material comprise, by mass percent, 32.45-50.27% of calcium oxide, 4.83-36.55% of silicon oxide and no more than 4.5% of aluminum oxide;
grinding and preheating the raw materials, calcining at 950-1200 ℃, cooling, digesting, drying and grinding to obtain the hydraulic lime.
2. The process for the production of hydraulic lime according to claim 1, characterized in that the calcination temperature is from 980 ℃ to 1100 ℃, the rate of rise of temperature of the calcination is from 5 ℃/min to 50 ℃/min, and the calcination time is not more than 1 hour.
3. A process for the production of hydraulic lime according to claim 1, characterized in that said digestion consists in determining the content of free calcium oxide in the product after calcination and cooling, in circulating the digestion in an environment with a humidity of 50% to 90%, in recording the weight change of the product before and after digestion, and in ending the digestion in the case where the rate of digestion of free calcium oxide in the product reaches 98%.
4. The process for the production of hydraulic lime according to claim 1, wherein the preheating temperature is 750 ℃ to 900 ℃ and the preheating time is 0.5 hour to 1 hour.
5. The process for the production of hydraulic lime according to claim 1, characterized in that the particle size of the hydraulic lime does not exceed 2% by sieving over 0.2mm and does not exceed 15% by sieving over 0.09 mm.
6. The process for the production of hydraulic lime according to claim 1, characterized in that the content of calcium hydroxide in the hydraulic lime is between 15% and 78% and the content of sulfur trioxide is not more than 2% by mass.
7. The process for producing hydraulic lime according to claim 1, wherein the process produces hydraulic lime having different compressive strengths by controlling the mass ratio of calcium oxide to silicon oxide in the raw materials, wherein,
controlling the mass ratio of calcium oxide to silicon oxide to be 0.89-1.15, wherein the compressive strength range of the hydraulic lime obtained by curing the prepared hydraulic lime for 28 days is 5-15 MPa, and the content of calcium hydroxide in the hydraulic lime is not lower than 15%;
controlling the mass ratio of calcium oxide to silicon oxide to be more than 1.15 and less than 1.45, wherein the compressive strength range of the prepared hydraulic lime after curing for 28 days is 3.5MPa to 10MPa, and the content of calcium hydroxide in the hydraulic lime is not less than 25 percent;
the mass ratio of the calcium oxide to the silicon oxide is controlled to be 1.45-10.41, the compressive strength range of the hydraulic lime obtained by curing the prepared hydraulic lime for 28 days is 2.0-7.0 MPa, and the content of calcium hydroxide in the hydraulic lime is not lower than 35%.
8. The method of producing hydraulic lime according to claim 1, wherein the chemical components of the papermaking white mud comprise, in mass percent, 33.5% to 55.0% of calcium oxide, 0% to 10% of silicon oxide, and 0% to 10% of magnesium oxide.
9. The process for the production of hydraulic lime according to claim 1, characterized in that the silica contained in the clay is not less than 40% by mass.
10. Hydraulic lime, characterized in that it is produced by a hydraulic lime production process according to any one of claims 1 to 9, comprising, in mass percent, from 15% to 78% of calcium hydroxide and not more than 2% of sulfur trioxide, the hydraulic lime having a residue on a 0.2mm sieve of not more than 2% and a residue on a 0.09mm sieve of not more than 15%.
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| CN103466968A (en) * | 2013-08-23 | 2013-12-25 | 西安建筑科技大学 | Method for preparing natural hydraulic lime with lead and zinc mine tailings |
| CN104724953A (en) * | 2015-03-12 | 2015-06-24 | 北京工业大学 | Method for preparing natural hydraulic lime by using limestone and quartz powder |
| CN108863122A (en) * | 2018-07-27 | 2018-11-23 | 中国矿业大学(北京) | A kind of natural hydraulic lime and preparation method thereof |
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