Cement production batching method based on fluorite tailings
Through mechanical crushing and mixing of fluorite tailings, limestone and bauxite, combined with the batching control of DCS distributed control system, the problems of technology immature and unstable quality in the cement ingredients of fluorite tailings are solved, and cement is realized Production stability and environmentally friendly resource recycling.
Patent Information
- Application Number
- CN202410536028.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-30
- Publication Date
- 2024-12-17
AI Technical Summary
In the prior art, the use of fluorite tailings to prepare cement has problems such as immature technology and unstable product quality, and the environmental pollution and safety hazards of fluorite tailings have not been effectively solved.
By mechanically crushing, sieving and mixing fluorite tailings, limestone and bauxite, respectively, and conducting initial parameter tests, setting ratios based on the DCS distributed control system, controlling the feeder for feeding to ensure cement production and dispensing. quality.
The stability and quality control of the cement batching process are achieved, and the fluorite tailings are effectively utilized, which reduces production costs, reduces environmental burdens, and improves the performance of cement.
Smart Images
Figure CN119143408A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of cement batching, and in particular to a cement production batching method based on fluorite tailings. Background Art
[0002] Fluorite tailings refer to waste generated during the mining, beneficiation and processing of fluorite ore. They mainly come from the flotation, gravity separation, magnetic separation and other beneficiation links of fluorite ore, as well as the subsequent purification processes such as roasting and acid leaching of fluorite concentrate. This type of tailings usually contains a certain proportion of fluorite (the main component is calcium fluoride, CaF2) and other associated minerals, such as quartz, feldspar, calcite, mica, clay minerals, etc. Since fluorite tailings contain a certain amount of fluoride and other harmful elements (such as heavy metals), if they are randomly piled up or improperly disposed of, they may cause pollution to the soil, groundwater and ecological environment. In addition, tailings dumps also have safety hazards such as dust and landslides.
[0003] Since fluorite tailings contain calcium fluoride and a large amount of silicate minerals, they are used as mineralizers or auxiliary raw materials for silicate cement, and the calcium fluoride in them is used to reduce the firing temperature, increase the amount of liquid phase, and improve the mineral composition of clinker and cement performance. In recent years, as the country pays more and more attention to environmental protection and the effective use of resources, using fluorite tailings to prepare cement not only reduces production costs, but also reduces environmental burdens and realizes the effective recycling of resources. Therefore, cement companies have begun to try to use fluorite tailings to prepare cement, but there are problems such as immature technology and unstable product quality.
[0004] In view of this, the present application aims to provide a method for preparing cement production based on fluorite tailings, so as to better solve the problem of preparing cement based on fluorite tailings. Summary of the invention
[0005] The purpose of the embodiments of the present application is to provide a method for preparing cement production based on fluorite tailings, which can solve the technical problems of preparing cement based on fluorite tailings.
[0006] The present application provides a method for preparing cement using fluorite tailings, comprising the following steps:
[0007] S1. The fluorite tailings, limestone and bauxite are mechanically crushed, sieved and mixed to form raw materials;
[0008] S2. Conduct initial parameter tests on fluorite tailings raw materials, limestone raw materials and bauxite raw materials;
[0009] S3. Based on the initial parameters, the mix ratio is set in the DCS distributed control system, and the feeder is controlled to feed the materials to obtain the cement production mix.
[0010] Furthermore, in step S3, the weight of the limestone raw material in the cement production ingredients accounts for 65% to 70%, the weight of the bauxite raw material accounts for 20% to 25%, and the weight of the fluorite tailings raw material accounts for 5% to 10%.
[0011] Furthermore, in step S1, the fluorite tailings, limestone and bauxite are respectively mechanically crushed by a cone crusher, and then sieved to make the particle size of the fluorite tailings 5mm-10mm, and the particle sizes of the limestone and bauxite 10mm-30mm respectively.
[0012] Furthermore, in step S2, initial parameter tests are performed in the cement plant laboratory, wherein the initial parameters of the fluorite tailings include moisture content and CaF2 content, the initial parameters of the limestone include moisture content and CaO content, and the initial parameters of the bauxite include moisture content, aluminum, and silicon content.
[0013] Furthermore, in step S2, if the tested initial parameter of the fluorite tailings is that the CaF2 content is less than 2%, CaF2 is added to a content of 2%; if the tested initial parameter of the limestone is that the CaO content is less than 50%, CaO is added to a content of 50%; if the tested initial parameter of the bauxite is that the aluminum content is less than 40%, Al2O3 is added to a content of 40%; if the silicon content is lower than 1 / 6 of the aluminum content, SiO2 is added to a silicon-aluminum ratio of no more than 6.
[0014] Furthermore, in step S2, if the moisture content of the fluorite tailings raw material tested exceeds 10, it needs to be dried to control the moisture content not exceeding 10%; if the moisture content of the limestone raw material tested exceeds 3%, it needs to be dried to control the moisture content not exceeding 3%; if the moisture content of the bauxite raw material tested exceeds 3%, it needs to be dried to control the moisture content not exceeding 3%.
[0015] Furthermore, in step S3, the fluorite tailings raw material, limestone raw material and bauxite raw material are stored, mixed, conveyed and fed respectively through separately arranged storage mechanisms, metering and feeding mechanisms, mixing mechanisms, conveying mechanisms and feeders.
[0016] Furthermore, in step S3, the fluorite tailings, limestone and bauxite are fed into the vertical mill respectively, and the ingredients are mixed and refined by the vertical mill to complete the cement production ingredients.
[0017] Furthermore, in step S3, vibrating conveyors are used to transport the fluorite tailings raw material, the limestone raw material and the bauxite raw material respectively.
[0018] Furthermore, in step S3, screw feeders are used to feed the fluorite tailings raw material, the limestone raw material and the bauxite raw material respectively.
[0019] Beneficial effects of the present invention:
[0020] The cement production batching method based on fluorite tailings provided by the present invention comprises the following steps: mechanically crushing, sieving and uniformly mixing the fluorite tailings, limestone and bauxite respectively to form raw materials; performing initial parameter tests on the fluorite tailings, limestone and bauxite raw materials; and setting a proportion in a DCS distributed control system based on the initial parameters, and controlling a feeder to feed, so as to obtain cement production batching. The cement production batching method provided by the present invention has simple steps, and the batching process sets a proportion based on the initial parameters of each raw material, so as to control feeding through a DCS distributed control system, thereby consuming and utilizing the fluorite tailings, ensuring batching quality, and further ensuring back-end batching quality. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.
[0022] Figure 1 It is a batching process flow chart of the present invention;
[0023] Figure 2 The figure is a schematic diagram of the batching process of the fluorite tailings / limestone / bauxite raw materials of the present invention. DETAILED DESCRIPTION
[0024] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.
[0025] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.
[0026] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.
[0027] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the application is usually placed when in use. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.
[0028] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.
[0029] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0030] See also Figure 1-Figure 2 As shown, this embodiment provides a cement production batching method based on fluorite tailings, comprising the following steps:
[0031] S1. The fluorite tailings, limestone and bauxite are mechanically crushed by a cone crusher, and then sieved to make the fluorite tailings have a particle size of 5mm-10mm, and the particle sizes of limestone and bauxite are 10mm-30mm, respectively, and mixed evenly to form a raw material;
[0032] S2. The initial parameters of the cement plant laboratory were tested, wherein the initial parameters of the fluorite tailings included moisture content and CaF2 content, the initial parameters of the limestone included moisture content and CaO content, and the initial parameters of the bauxite included moisture content, aluminum, and silicon content;
[0033] If the initial parameter of the fluorite tailings tested is that the CaF2 content is less than 2%, CaF2 is added to a content of 2%; if the initial parameter of the limestone tested is that the CaO content is less than 50%, CaO is added to a content of 50%; if the initial parameter of the bauxite tested is that the aluminum content is less than 40%, Al2O3 is added to a content of 40%; if the silicon content is less than 1 / 6 of the aluminum, SiO2 is added to a silicon-aluminum ratio of no more than 6;
[0034] If the moisture content of the fluorite tailings raw material tested exceeds 10%, it needs to be dried to control the moisture content to no more than 10%; if the moisture content of the limestone raw material tested exceeds 3%, it needs to be dried to control the moisture content to no more than 3%; if the moisture content of the bauxite raw material tested exceeds 3%, it needs to be dried to control the moisture content to no more than 3%;
[0035] S3. Based on the initial parameters, the proportion is set in the DCS distributed control system, and the feeder is controlled to feed the materials into the vertical mill. The ingredients are mixed and refined by the vertical mill to complete the cement production batching. The DCS distributed control system can specifically adopt ABB's 800xA system to control the storage mechanism, metering and feeding mechanism, mixing mechanism, conveying mechanism and feeder of each raw material, and respectively store, mix, convey and feed the fluorite tailings raw material, limestone raw material and bauxite raw material to finally obtain the cement production batching. The weight of the limestone raw material accounts for 65% to 70%, the weight of the bauxite raw material accounts for 20% to 25%, and the weight of the fluorite tailings raw material accounts for 5% to 10%.
[0036] Specifically, vibrating conveyors are used to transport fluorite tailings raw materials, limestone raw materials and bauxite raw materials respectively.
[0037] Specifically, screw feeders are used to feed fluorite tailings raw materials, limestone raw materials and bauxite raw materials respectively.
[0038] The following is a specific test example
[0039] The above batching method is used, wherein the CaF2 content of the fluorite tailings is 3%, the moisture content is 8%, the initial parameters of the limestone are 60% CaO content, 2% moisture content, 42% aluminum content of the bauxite, and 6% silicon content;
[0040] At the same time, the cement production ingredients are prepared according to the weight ratio of limestone raw materials 70%, bauxite raw materials 20%, and fluorite tailings raw materials 10%;
[0041] After that, the prepared materials are sent to the raw material homogenization warehouse for homogenization. The homogenized raw material powder is sent to the preheater for preheating and partial decomposition. The waste heat of the kiln exhaust gas is used to reduce energy consumption. The preheated raw material powder enters the rotary kiln for high-temperature calcination. The temperature is controlled at 1400-1450℃. The calcined clinker is quickly cooled by the cooler. The cooled clinker is ground to make the specific surface area of the cement product reach 350m 2 / kg.
[0042] The compressive strength test of the finished cement product was carried out, and the test result reached 55MPa, which can meet the strength requirement of silicate cement.
[0043] In summary, the cement production batching method based on fluorite tailings provided in this application has simple steps. The batching process sets the ratio based on the initial parameters of each raw material, and controls the feeding through the DCS distributed control system, thereby consuming and utilizing the fluorite tailings, ensuring the batching quality and further ensuring the back-end production quality.
[0044] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A cement production batching method based on fluorite tailings, characterized in that: The steps include: S1. The fluorite tailings, limestone and bauxite are mechanically crushed, sieved and mixed to form raw materials; S2. Conduct initial parameter tests on fluorite tailings raw materials, limestone raw materials and bauxite raw materials; S3. Based on the initial parameters, the mix ratio is set in the DCS distributed control system, and the feeder is controlled to feed the materials to obtain the cement production mix.
2. The method for preparing cement using fluorite tailings according to claim 1, characterized in that: In step S3, the weight of the limestone raw material in the cement production ingredients accounts for 65% to 70%, the weight of the bauxite raw material accounts for 20% to 25%, and the weight of the fluorite tailings raw material accounts for 5% to 10%.
3. The method for preparing cement using fluorite tailings according to claim 1, characterized in that: In step S1, the fluorite tailings, limestone and bauxite are mechanically crushed by a cone crusher, and then sieved to make the particle size of the fluorite tailings 5mm-10mm, and the particle sizes of the limestone and bauxite 10mm-30mm respectively.
4. The method for preparing cement using fluorite tailings according to claim 1, characterized in that: In step S2, initial parameter tests are performed in the cement plant laboratory, wherein the initial parameters of the fluorite tailings include moisture content and CaF2 content, the initial parameters of the limestone include moisture content and CaO content, and the initial parameters of the bauxite include moisture content, aluminum, and silicon content.
5. The method for producing cement based on fluorite tailings according to claim 4, characterized in that: In step S2, if the tested initial parameter of the fluorite tailings is that the CaF2 content is less than 2%, CaF2 is added to the content of 2%; if the tested initial parameter of the limestone is that the CaO content is less than 50%, CaO is added to the content of 50%; if the tested initial parameter of the bauxite is that the aluminum content is less than 40%, Al2O3 is added to the content of 40%; if the silicon content is lower than 1 / 6 of the aluminum, SiO2 is added to the silicon-aluminum ratio not exceeding 6.
6. The method for producing cement based on fluorite tailings according to claim 5, characterized in that: In step S2, if the moisture content of the fluorite tailings raw material tested exceeds 10, it needs to be dried to control the moisture content not exceeding 10%; if the moisture content of the limestone raw material tested exceeds 3%, it needs to be dried to control the moisture content not exceeding 3%; if the moisture content of the bauxite raw material tested exceeds 3%, it needs to be dried to control the moisture content not exceeding 3%.
7. The method for producing cement based on fluorite tailings according to claim 6, characterized in that: In step S3, the fluorite tailings raw material, the limestone raw material and the bauxite raw material are stored, mixed, conveyed and fed respectively through the separately arranged storage mechanism, metering feeding mechanism, mixing mechanism, conveying mechanism and feeder.
8. The method for producing cement based on fluorite tailings according to claim 7, characterized in that: In step S3, the fluorite tailings, limestone and bauxite are fed into the vertical mill respectively, and the ingredients are mixed and refined by the vertical mill to complete the cement production batching.
9. The method for producing cement based on fluorite tailings according to claim 7, characterized in that: In step S3, vibrating conveyors are used to transport the fluorite tailings raw material, the limestone raw material and the bauxite raw material respectively.
10. The method for producing cement based on fluorite tailings according to claim 7, characterized in that: In step S3, screw feeders are used to feed fluorite tailings raw materials, limestone raw materials and bauxite raw materials respectively.