Use method of fluorgypsum in cement and doping equipment

Abstract

The invention relates to the technical field of building materials, in particular to a using method and doping equipment of fluorgypsum in cement, the fluorgypsum is added into the cement, the content of the fluorgypsum is controlled, so that the strength of cement mortar can be improved, calcium fluoride ions and fluorine ions can promote the cement hardening reaction, and the strength of the cement mortar is improved. The fluorgypsum is added into the cement mortar to form a more compact hardened product and stronger chemical bonds, so that the mortar has higher compressive strength and tensile strength, and meanwhile, the fluorgypsum can prevent corrosion and degradation of the cement mortar, can also prevent the cement mortar from cracking and shrinking phenomena, and improves the fluidity and construction performance of the cement mortar; as the strength is in direct proportion to SO3 when the fluorgypsum is doped in the cement, the content of SO3 in the fluorgypsum is controlled to be 3.0-3.3%, the strength of the cement is high, the retarding effect is obvious, and the problems that the strength of the cement is easy to reduce and the cement is easy to block when the existing cement mostly adopts desulfurized gypsum or ardealite as a retarder are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of building materials, and particularly to a method for using fluorogypsum in cement and a feeding device therefor. Background Art

[0002] Fluorogypsum is a by-product of the chemical industry, and its main component is CaSO4. Fluorogypsum can be used as a setting retarder for cement production or for producing building gypsum, but its application is not extensive. Cement production enterprises have misunderstandings and concerns about the use of fluorogypsum. Cement production enterprises are used to using dihydrate gypsum with high crystal water content such as desulfurized gypsum or phosphogypsum as the setting retarder. However, fluorogypsum has low crystal water content and is acidic anhydrite, so its setting retardation effect is not so obvious.

[0003] However, through experiments and long-term use, it is found that as long as the incorporation amount of fluorogypsum is sufficient and appropriate, the setting retardation effect of fluorogypsum is very obvious, and there are more and better advantages than dihydrate gypsum. Through experiments, the higher the fluorogypsum content, the higher the SO3 control, the more obvious the setting retardation effect, the better the adaptability to additives, and the higher the strength, and the strength is even better than that of using dihydrate gypsum. GB175-2023 "General Portland Cement" stipulates that the SO3 content in cement should not exceed 3.5%. As long as the SO3 is controlled within the national standard range, adding fluorogypsum to cement will achieve good results. Summary of the Invention

[0004] The purpose of the present invention is to provide a method for using fluorogypsum in cement and a feeding device therefor, which solves the problems that most existing cements use dihydrate gypsum with high crystal water content such as desulfurized gypsum or phosphogypsum as the setting retarder, resulting in easy shrinkage of cement strength and easy blockage during use.

[0005] To achieve the above purpose, in the first aspect, the present invention provides a method for using fluorogypsum in cement, including the following steps:

[0006] Raw material preparation: Prepare fluorogypsum, limestone, clay, and iron ore powder as raw materials for preparing cement.

[0007] Cement pretreatment: Crush, grind, preheat and pre-decompose the limestone, clay, and iron ore powder in sequence, burn them into clinker, obtain cement clinker, and cool the cement clinker.

[0008] Measurement: Weigh the fluorogypsum and accurately measure the fluorogypsum.

[0009] Mixing: Transfer the measured fluorogypsum and the cooled cement clinker into a mixing device, and perform grinding and mixing in the mixing device to obtain the required cement.

[0010] Among them, for the cement pretreatment, the specific steps of successively crushing, grinding, preheating and pre-decomposing, and burning into clinker for the limestone, the clay, and the iron ore powder to obtain cement clinker are as follows:

[0011] Crushing: Pour the limestone, the clay, and the iron ore powder together into a crusher, and let the limestone, the clay, and the iron ore powder be crushed in the crusher;

[0012] Grinding: After crushing, transfer the limestone, the clay, and the iron ore powder to a grinding mill for grinding, and after grinding is completed, sieve to obtain raw materials that meet the standards;

[0013] Preheating and pre-decomposing: Transfer the raw materials to a preheater, and let the raw materials exchange heat with the hot gas discharged from the tail end of the preheater to achieve preheating and partial decomposition;

[0014] Burning into clinker: Transfer the raw materials after preheating and pre-decomposing to a rotary kiln for clinker burning to obtain cement clinker.

[0015] Among them, when the cement clinker is cooled, it is necessary to cool the cement clinker, and at the same time, recover the heat of the cement clinker to improve the thermal efficiency of the rotary kiln and the quality of the cement clinker.

[0016] Among them, for the metering, the specific steps of weighing the fluorogypsum and accurately metering the fluorogypsum are as follows:

[0017] Weigh the weight of the fluorogypsum according to the quality of the cement clinker, control the SO3 in the mixture to be 3.0 - 3.3%, and then use a special metering device to accurately meter the fluorogypsum.

[0018] Among them, for the mixing, the specific steps of transferring the metered fluorogypsum and the cooled cement clinker to a mixing device and performing grinding and mixing in the mixing device to obtain the required cement are as follows:

[0019] Transfer the metered fluorogypsum and the cooled cement clinker to a first storage bin and a second storage bin respectively, and place the first storage bin and the second storage bin on a conveyor device respectively;

[0020] Through the conveyor device, convey the first storage bin and the second storage bin to the mixing device respectively, and pour the fluorogypsum and the cement clinker in the first storage bin and the second storage bin into the mixing device;

[0021] Let the fluorogypsum and the cement clinker in the mixing device be ground and mixed in the mixing device to obtain the required cement.

[0022] Among them, the specific steps of grinding and mixing the fluorogypsum and the cement clinker in the mixing device are as follows:

[0023] Let the grinding rollers arranged in the mixing device grind the fluorogypsum and the cement clinker in the mixing device, and after grinding, sieve them to obtain powder particles meeting the standards;

[0024] Let the stirring rod in the mixing device rotate, drive the stirring blades to rotate in the mixing device, and mix the powder particles in the mixing device.

[0025] In a second aspect, the present invention also provides a doping device for using fluorogypsum in cement, including a metering device, a first storage tank, a second storage tank, a conveying device and a mixing device, and the metering device, the first storage tank, the second storage tank, the conveying device and the mixing device are all placed on the ground;

[0026] The metering device is used to accurately measure the mass of the weighed fluorogypsum;

[0027] The first storage tank is used to store the fluorogypsum after metering;

[0028] The second storage tank is used to store the cement clinker after cooling;

[0029] The conveying device is used to convey the first storage tank and the second storage tank;

[0030] The mixing device is used to grind and mix the fluorogypsum and the cement clinker to prepare the required cement.

[0031] For a method of using fluorogypsum in cement and a doping device of the present invention, by adding fluorogypsum to cement and controlling the content of fluorogypsum, an appropriate amount of fluorogypsum can improve the strength of cement mortar. Calcium fluoride ions and fluoride ions can promote the cement hardening reaction, form denser hardening products and stronger chemical bonds, so that the mortar has higher compressive strength and tensile strength. At the same time, fluorogypsum can prevent the corrosion and deterioration of cement mortar, prevent the appearance of cracks and shrinkage in cement mortar, and improve the fluidity and construction performance of cement mortar. In addition, since the strength of cement is proportional to SO3 when fluorogypsum is doped in cement, it is the best control index to control the content of SO3 in fluorogypsum at 3.0 - 3.3%. At this time, the strength of cement is high and the setting retardation effect is obvious, solving the technical problems that most existing cements use dihydrate gypsum with high crystal water such as desulfurized gypsum or phosphogypsum as a setting retarder, the strength of cement is prone to reverse shrinkage, and it is easy to block materials during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art.

[0033] Figure 1 It is a flowchart of the usage method of fluorogypsum in cement according to the first embodiment of the present invention.

[0034] Figure 2 It is the specific step diagram of the cement pretreatment in the usage method of fluorogypsum in cement according to the first embodiment of the present invention, where the limestone, the clay, and the iron ore powder are sequentially crushed, ground, preheated and pre-decomposed, and burned into clinker to obtain cement clinker.

[0035] Figure 3 It is the specific step diagram of the mixing in the usage method of fluorogypsum in cement according to the first embodiment of the present invention, where the metered fluorogypsum and the cooled cement clinker are both transferred into the mixing device, and grinding and mixing are performed in the mixing device to obtain the required cement.

[0036] Figure 4 It is the specific step diagram of allowing the fluorogypsum and the cement clinker in the mixing device to perform grinding and mixing in the mixing device in the usage method of fluorogypsum in cement according to the first embodiment of the present invention.

[0037] Figure 5 It is the overall structural schematic diagram of the incorporation device for the use of fluorogypsum in cement according to the second embodiment of the present invention.

[0038] In the figure: 101 - metering device, 102 - first storage bin, 103 - second storage bin, 104 - conveying device, 105 - mixing device. Detailed implementation manners

[0039] The following will describe in detail the embodiments of the present invention. The examples of the embodiments are shown in the drawings. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present invention, and should not be construed as a limitation to the present invention.

[0040] First embodiment:

[0041] Please refer to Figures 1 to 4 , the present invention provides a usage method of fluorogypsum in cement, including the following steps:

[0042] S1. Raw material preparation, preparing fluorogypsum, limestone, clay, and iron ore powder as raw materials for preparing cement.

[0043] Specifically,

[0044] S2. Cement pretreatment: successively crush, grind, preheat and pre-decompose, and calcine into clinker the limestone, the clay and the iron ore powder to obtain cement clinker, and cool the cement clinker.

[0045] Specifically, the specific steps of the cement pretreatment, which successively crush, grind, preheat and pre-decompose, and calcine into clinker the limestone, the clay and the iron ore powder to obtain cement clinker, are as follows:

[0046] S21. Crushing: Pour the limestone, the clay and the iron ore powder together into a crusher, and carry out crushing treatment on the limestone, the clay and the iron ore powder in the crusher.

[0047] S22. Grinding: After crushing, transfer the limestone, the clay and the iron ore powder to a grinding mill for grinding treatment, and after the grinding is completed, screen to obtain raw meal meeting the standards.

[0048] Specifically, after the grinding of the limestone, the clay and the iron ore powder, screen through a 100 - 150 mesh sieve to obtain the raw meal meeting the standards.

[0049] S23. Preheating and pre-decomposing: Transfer the raw meal to a preheater, and carry out heat exchange between the raw meal and the hot gas discharged from the tail end of the preheater to achieve preheating and partial decomposition.

[0050] S24. Calcining into clinker: Transfer the raw meal after preheating and pre-decomposing to a rotary kiln for calcining into clinker to obtain cement clinker.

[0051] Specifically, after obtaining the cement clinker, it is necessary to cool the cement clinker. When cooling the cement clinker, it is necessary to cool the cement clinker to room temperature, and at the same time, recover the heat in the cement clinker to improve the thermal efficiency of the rotary kiln and the quality of the cement clinker.

[0052] S3. Metering: Weigh the fluorogypsum and accurately meter the fluorogypsum.

[0053] Specifically, the specific steps of the metering, which weigh the fluorogypsum and accurately meter the fluorogypsum, are as follows:

[0054] Weigh the weight of the fluorogypsum according to 5.3 - 5.86% of the mass of the cement clinker, and then accurately meter the fluorogypsum by using a special metering device 101. Among them, the SO3 content in the fluorogypsum is 56.27, and control the SO3 content at 3.0 - 3.3%.

[0055] S4. Mixing: Transfer the metered fluorogypsum and the cooled cement clinker to the mixing device 105, and perform grinding and mixing in the mixing device 105 to obtain the required cement.

[0056] Specifically, the steps of the mixing, where the metered fluorogypsum and the cooled cement clinker are transferred to the mixing device 105 and grinding and mixing are performed in the mixing device 105 to obtain the required cement, are as follows:

[0057] S41. Transfer the metered fluorogypsum and the cooled cement clinker to the first storage bin 102 and the second storage bin 103 respectively, and place the first storage bin 102 and the second storage bin 103 on the conveyor device 104.

[0058] S42. Convey the first storage bin 102 and the second storage bin 103 to the mixing device 105 through the conveyor device 104, and pour the fluorogypsum and the cement clinker in the first storage bin 102 and the second storage bin 103 into the mixing device 105.

[0059] S43. Let the fluorogypsum and the cement clinker in the mixing device 105 perform grinding and mixing in the mixing device 105 to obtain the required cement.

[0060] Specifically, the steps of letting the fluorogypsum and the cement clinker in the mixing device 105 perform grinding and mixing in the mixing device 105 are as follows:

[0061] S431. Let the grinding rollers provided in the mixing device 105 grind the fluorogypsum and the cement clinker in the mixing device 105, and after grinding, perform sieving to obtain powder particles that meet the standards.

[0062] Specifically, after the fluorogypsum and the cement clinker are ground in the mixing device 105, they are sieved through a 50 - 100 mesh sieve to obtain powder particles that meet the standards.

[0063] S432. Let the stirring rod in the mixing device 105 rotate, driving the stirring blades to rotate in the mixing device 105 to mix the powder particles in the mixing device 105.

[0064] When using the method for using fluorogypsum in cement of this embodiment, during the preparation of cement, by adding fluorogypsum to the cement and controlling the content of fluorogypsum, an appropriate amount of fluorogypsum can improve the strength of cement mortar. Calcium fluoride ions and fluoride ions can promote the cement hardening reaction, forming a denser hardening product and stronger chemical bonds, thereby enabling the mortar to have higher compressive strength and tensile strength. At the same time, fluorogypsum can prevent the corrosion and deterioration of cement mortar, prevent the occurrence of cracks and shrinkage in cement mortar, and improve the fluidity and construction performance of cement mortar. In addition, since the strength of cement is proportional to SO3 when fluorogypsum is added to cement, it is optimal to control the content of SO3 in fluorogypsum at 3.0 - 3.3%. At this time, the strength of the cement is high and the retarding effect is obvious, solving the technical problems that most existing cements use dihydrate gypsum with high crystal water such as desulfurized gypsum or phosphogypsum as retarders, and the strength of the cement is prone to reverse shrinkage and it is easy to block materials during use.

[0065] Second Embodiment:

[0066] Based on the first embodiment, please refer to Figure 5 , the present invention further provides an incorporation device for using fluorogypsum in cement, including a metering device 101, a first storage tank 102, a second storage tank 103, a conveying device 104, and a mixing device 105.

[0067] In this embodiment, through the coordinated use of the metering device 101, the first storage tank 102, the second storage tank 103, the conveying device 104, and the mixing device 105, an appropriate amount of fluorogypsum can be added during the cement production process to improve the retarding effect and strength of the cement.

[0068] Among them, the metering device 101, the first storage tank 102, the second storage tank 103, the conveying device 104, and the mixing device 105 are all placed on the ground; the metering device 101 is used to accurately measure the mass of the weighed fluorogypsum; the first storage tank 102 is used to store the fluorogypsum after being metered; the second storage tank 103 is used to store the cement clinker after being cooled; the conveying device 104 is used to convey the first storage tank 102 and the second storage tank 103; the mixing device 105 is used to grind and mix the fluorogypsum and the cement clinker to prepare the required cement.

[0069] When using the incorporation device for fluorogypsum in cement of this embodiment, the mass of the fluorogypsum weighed by the metering device 101 is accurately measured. After weighing, the metered fluorogypsum is stored in the first storage bin 102, and the cooled cement clinker is stored in the second storage bin 103. Then, the first storage bin 102 and the second storage bin 103 are conveyed by the conveying device 104 until they are conveyed to the mixing device 105, so that the mixing device 105 can grind and mix the fluorogypsum and the cement clinker in the mixing device 105 to prepare the required cement.

[0070] Through the combined use of the metering device 101, the first storage bin 102, the second storage bin 103, the conveying device 104 and the mixing device 105, it is possible to add an appropriate amount of fluorogypsum during the cement production process to improve the setting retardation effect and strength of the cement, solving the technical problems that most existing cements use dihydrate gypsum with high crystal water such as desulfurized gypsum or phosphogypsum as the setting retarder, resulting in easy shrinkage of cement strength and easy blockage during use.

[0071] The above-disclosed are only one or more preferred embodiments of the present application, and the scope of rights of the present application cannot be limited thereby. Those of ordinary skill in the art can understand all or part of the processes of implementing the above embodiments, and the equivalent changes made according to the claims of the present application still fall within the scope covered by the present application.

Claims

1. A method for using fluorgypsum in cement, characterized in that: The following steps are involved: Raw material preparation: preparing fluorgypsum, limestone, clay and iron ore powder as raw materials for preparing cement; Cement pretreatment, crushing, grinding, preheating and pre-decomposing the limestone, the clay and the iron ore powder in sequence, burning them into clinker to obtain cement clinker, and cooling the cement clinker; Measuring, weighing the fluorgypsum, and accurately measuring the fluorgypsum; Mixing, transferring the measured fluorgypsum and the cooled cement clinker into a mixing device, grinding and mixing them in the mixing device to obtain the required cement.

2. The method for using fluorgypsum in cement according to claim 1, characterized in that: The concrete steps of cement pretreatment, namely, crushing, grinding, preheating and pre-decomposing, and burning the limestone, clay, and iron ore powder in sequence to obtain cement clinker are as follows: Crushing, pouring limestone, clay and iron ore powder into a crusher together, and allowing the limestone, clay and iron ore powder to be crushed in the crusher; Grinding: after crushing, the limestone, the clay and the iron ore powder are transferred to a grinding machine for grinding, and after the grinding is completed, they are sieved to obtain raw materials that meet the standards; Preheating and pre-decomposition: transferring the raw meal into a preheater, allowing the raw meal to exchange heat with the hot gas discharged from the tail end of the preheater to achieve preheating and partial decomposition; The raw material is burned into clinker, and the raw material after preheating and pre-decomposition is transferred to a rotary kiln for burning into clinker to obtain cement clinker.

3. The method for using fluorgypsum in cement according to claim 2, characterized in that: When the cement clinker is cooled, it is necessary to cool the cement clinker and, at the same time, recover the heat in the cement clinker to improve the thermal efficiency of the rotary kiln and the quality of the cement clinker.

4. The method for using fluorgypsum in cement according to claim 1, characterized in that: The specific steps of weighing the fluorgypsum and accurately measuring the fluorgypsum are as follows: The quality index of cement SO3 is controlled to be 3.0-3.3%, and a special metering device is used to accurately measure the fluorgypsum.

5. The method for using fluorgypsum in cement according to claim 1, characterized in that: The mixing, transferring the measured fluorgypsum and the cooled cement clinker into a mixing device, and grinding and mixing them in the mixing device to obtain the required cement, is as follows: Transferring the measured fluorgypsum and the cooled cement clinker to the first storage box and the second storage box respectively, and placing the first storage box and the second storage box on the conveying device respectively; The first storage box and the second storage box are respectively conveyed to the mixing device by the conveying device, and the fluorgypsum and the cement clinker in the first storage box and the second storage box are poured into the mixing device; The fluorgypsum and the cement clinker in the mixing device are ground and mixed in the mixing device to obtain the required cement.

6. The method for using fluorgypsum in cement according to claim 5, characterized in that: The specific steps of grinding and mixing the fluorgypsum and the cement clinker in the mixing device are as follows: The grinding rollers in the mixing device are used to grind the fluorinated gypsum and cement clinker in the mixing device, and after grinding, the grinding rollers are sieved to obtain powder particles that meet the standards; The stirring rod in the mixing device is rotated to drive the stirring blades in the mixing device to rotate, so as to mix the powder particles in the mixing device.

7. A device for adding fluorinated gypsum to cement, applied to the method for using fluorinated gypsum in cement as claimed in any one of claims 1 to 6, characterized in that: It comprises a metering device, a first material storage box, a second material storage box, a conveying device and a mixing device, wherein the metering device, the first material storage box, the second material storage box, the conveying device and the mixing device are all placed on the ground; The metering device is used to accurately measure the mass of the fluorgypsum taken; The first storage box is used to store the measured fluorgypsum; The second storage box is used to store the cooled cement clinker; The conveying device is used to convey the first storage box and the second storage box; The mixing device is used for grinding and mixing fluorgypsum and cement clinker to prepare the required cement.

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