Method for judging high-temperature mixing homogeneity of blast furnace slag microcrystalline glass melt

Abstract

The application discloses a method for judging high-temperature mixed melting uniformity of blast furnace slag microcrystalline glass melt, and mainly comprises the following steps: (1) determining blast furnace slag content and melting temperature of the glass melt to be measured; (2) substituting the blast furnace slag content and the melting temperature of the glass melt to be measured into a relational expression between electric conductivity and blast furnace slag content and melting temperature, so as to obtain an electric conductivity standard value of the glass melt to be measured; and (3) comparing the on-line electric conductivity of the glass melt to be measured with the electric conductivity standard value obtained in the step (2), if the standard deviation value range of the two is within ±5 mS / cm, then the high-temperature mixed melting uniformity of the glass melt reaches the requirement, otherwise, the uniformity of the glass melt does not reach the requirement. According to the conductivity characteristics of the glass melt under high-temperature conditions, the high-temperature mixed melting uniformity is judged by comparing the on-line electric conductivity with the standard value range, so that the on-line direct testing can be realized, the related data can be fed back, and the production efficiency is improved.

Description

Technical Field

[0001] This invention relates to a method for determining the high-temperature melting uniformity of blast furnace slag glass-ceramic melt, which is mainly used for determining the high-temperature melt uniformity when preparing glass-ceramic using blast furnace slag. Background Technology

[0002] Microcrystalline glass refers to a polycrystalline composite solid material with a special structure obtained by taking a base glass with a specific composition and subjecting it to a certain heat treatment regime, which causes a nucleating agent in the base glass to precipitate a large number of tiny crystalline phases that are uniformly distributed with the glass phase through various processes.

[0003] Microcrystalline glass comes in a wide variety of types and possesses many excellent properties. Architectural decorative microcrystalline glass is the most common type, widely used in building decoration and renovation projects alongside natural stone and architectural ceramics. Architectural decorative microcrystalline glass belongs to the CaO-MgO-Al2O3-SiO2 glass system, with abundant raw material sources, utilizing large quantities of natural minerals and industrial slag. Therefore, it has lower costs and is beneficial to environmental protection, the effective utilization of mineral resources, and sustainable development.

[0004] Blast furnace slag is a waste product discharged from the blast furnace during pig iron smelting. When the furnace temperature reaches 1500℃, the molten charge absorbs impurities from the pig iron, forming slag mainly composed of silicates and aluminates that floats on the molten iron. As a high-quality waste heat resource, the efficient utilization of blast furnace slag has always been an environmental issue of great concern to the steel industry. The total content of oxides such as CaO, SiO2, Al2O3, and MgO in blast furnace slag can reach over 90%, and these oxide components happen to be the main chemical components of microcrystalline glass materials for architectural decoration. Given the large market demand for building and decorative materials, combining the recycling and utilization of blast furnace slag with the production and preparation of microcrystalline glass materials for architectural decoration is currently an effective way to solve the problem of efficient utilization of blast furnace slag waste.

[0005] Because the preparation of microcrystalline glass requires high-temperature melting of the basic glass raw materials, energy consumption accounts for 35-40% of the production cost. Using blast furnace slag directly to prepare microcrystalline glass allows for the simultaneous and efficient utilization of both the slag's "slag body" and "sensible heat." When directly using blast furnace slag to prepare microcrystalline glass, its usage can account for 55-75% of the total raw material mass. To improve its melting and forming performance, an additional 25-45% of other raw materials needs to be added. Since blast furnace slag is a high-temperature melt, and the added raw materials are room-temperature powders, they need to be mixed and homogenized under high-temperature conditions. However, directly judging the quality of melt homogenization online is crucial and difficult to achieve directly.

[0006] Blast furnace slag has its own temperature-viscosity characteristics. Its high CaO content results in short glass properties, which is unfavorable for glass rolling. To achieve simultaneous utilization of high-temperature blast furnace slag heat, its composition and properties must be modulated at high temperatures. This involves adding other raw materials and adjusting the composition to create a glass melt with good performance and uniform quality, suitable for glass rolling. Under high-temperature conditions, the modulated glass melt composition and properties must be relatively uniform. Current methods for characterizing the uniformity of high-temperature glass melt composition and properties involve removing the molten mixture, cooling it, and testing its composition using chemical analysis and X-ray fluorescence analysis; and using a rotating high-temperature viscometer to test its temperature-viscosity curve. Both methods are offline, requiring long testing times and feedback cycles, and cannot achieve rapid online testing and feedback. For the preparation of architectural decorative microcrystalline glass from high-temperature blast furnace slag, high-temperature melting uniformity is fundamental, and characterizing this uniformity under high-temperature conditions is a prerequisite. Summary of the Invention

[0007] The technical problem to be solved by this invention is to provide a method for judging the high-temperature mixing uniformity of blast furnace slag microcrystalline glass melt, addressing the shortcomings of the existing technology. This invention, based on the characteristic that glass melt is conductive under high-temperature conditions, compares its conductivity with a standard value range through online testing to determine the high-temperature mixing uniformity. This allows for direct online testing, feedback of relevant data, and improved production efficiency.

[0008] The technical solution proposed by this invention to solve the above problems is as follows:

[0009] A method for determining the high-temperature mixing uniformity of blast furnace slag microcrystalline glass melt, the main steps of which are as follows:

[0010] (1) Determine the raw materials of the microcrystalline glass. Under the condition that the raw materials are the same, determine the electrical conductivity of the glass melt of the microcrystalline glass at different melting temperatures when the content of blast furnace slag in the raw materials is different and the proportion of other raw materials other than blast furnace slag remains unchanged.

[0011] (2) Based on the electrical conductivity (δ, in mS / cm), melting temperature (T, in °C), and blast furnace slag content (C, in wt%) data in step (1), establish the relationship between electrical conductivity, blast furnace slag content, and melting temperature, as shown in equation (1):

[0012]

[0013] (3) Substitute the blast furnace slag content and melting temperature of the glass melt to be tested into the relationship (1) obtained in step (2) to obtain the standard value of the electrical conductivity of the glass melt to be tested;

[0014] (4) Compare the standard value of the electrical conductivity of the glass melt to be tested with the online electrical conductivity. If the standard deviation of the two values ​​is within ±5mS / cm, the high-temperature mixing uniformity of the glass melt meets the requirements; if the standard deviation of the two values ​​is outside ±5mS / cm, the uniformity of the glass melt does not meet the requirements.

[0015] According to the above scheme, the main raw material components of the microcrystalline glass include blast furnace slag, quartz sand, soda ash, borax, and crystal nucleating agent TiO2. Further, the raw material proportions of the microcrystalline glass, by weight percentage, are within the following range: 55-75 wt% high-temperature blast furnace slag, 20-35 wt% quartz sand, 3-10 wt% soda ash, 1-6 wt% borax, and a total of 1-3 wt% titanium dioxide. In specific operations, these proportions can be selected and adjusted within this range. The mass ratio of quartz sand, soda ash, borax, and titanium dioxide is 25:5:3:2, meaning that the proportions of the other raw materials, except for the blast furnace slag, remain constant.

[0016] According to the above scheme, the online conductivity is obtained by a conductivity meter installed on the liquid surface of the cooling section of the glass melting furnace.

[0017] According to the above scheme, the proportion of blast furnace slag in the glass melt varies in the range of 55-75 wt%, the melting temperature is in the range of 1410-1480℃, and the corresponding electrical conductivity of the glass melt is in the range of 340-630 mS / cm.

[0018] According to the above scheme, when the online conductivity data of the glass melt to be tested is close to the standard value of the glass melt conductivity at this time and is within its standard deviation range, it indicates that the high-temperature mixing uniformity of the glass melt meets the requirements, and the next stage of forming process can be carried out to prepare high-performance microcrystalline glass; when the online conductivity data of the glass melt to be tested deviates from the standard value of the glass melt conductivity at this time and is outside its standard deviation range, it indicates that the uniformity of the glass melt does not meet the requirements, and the relevant data can be fed back to the operator to adjust its front-end process until the conductivity of the glass melt meets the requirements before the next stage of forming process can be carried out.

[0019] In existing technologies, online testing of the uniformity of glass melt under high-temperature conditions is extremely difficult. Methods such as chemical analysis and X-ray fluorescence analysis require removing and cooling the melt, resulting in long testing cycles. Similarly, using a rotating high-temperature viscometer to test its temperature-viscosity curve also requires removing, cooling, and reheating the melt, representing offline methods with long testing and feedback cycles, failing to achieve rapid online testing and feedback. In contrast, this invention leverages the conductivity of glass melt under high-temperature conditions. By testing its conductivity online, it enables the assessment of the mixing uniformity of high-temperature blast furnace slag + admixture melt. This allows for direct online testing, data feedback, rapid production guidance, and process adjustments, improving production efficiency. This is of great significance for the production of architectural decorative microcrystalline glass using blast furnace slag. Detailed Implementation

[0020] To better understand the content of this invention, examples will be used to further illustrate the content of this invention below, but the examples of this invention are not limited to the following examples.

[0021] In the following embodiments, the direct preparation of architectural decorative microcrystalline glass using high-temperature blast furnace slag mainly comprises high-temperature blast furnace slag, quartz sand, soda ash, and borax, with TiO2 as the nucleating agent. The weight percentages are as follows: high-temperature blast furnace slag 55-75 wt%, quartz sand 20-35 wt%, soda ash 3-10 wt%, borax 1-6 wt%, and titanium dioxide 1-3 wt%, wherein the mass ratio of quartz sand, soda ash, borax, and titanium dioxide is 25:5:3:2. In specific operations, this glass component range can be selected and adjusted. For example, when other raw materials in the microcrystalline glass meet the condition that "the electrical conductivity of the mixed melt (blast furnace slag + admixtures) is stable," the method for judging the high-temperature mixing uniformity of the blast furnace slag microcrystalline glass melt described in this invention can also be used.

[0022] Example

[0023] In this embodiment, high-temperature blast furnace slag is used to prepare microcrystalline glass for building decoration. The glass composition is expressed as a percentage by weight, with high-temperature blast furnace slag at 55-75 wt% and the total content of quartz sand, soda ash, borax, and titanium oxide at 25-45%. The mass ratio of quartz sand, soda ash, borax, and titanium oxide is 25:5:3:2.

[0024] The specific steps for determining the high-temperature mixing uniformity of blast furnace slag microcrystalline glass melt are as follows:

[0025] 1. According to the above glass mixing ratio, blast furnace slag is mixed with quartz sand, soda ash, borax and titanium oxide for high-temperature mixing and melting at a temperature of 1550℃. The heating method of the glass melting furnace can be a flame furnace or an electric melting furnace.

[0026] 2. After high-temperature mixing and melting, the glass melt undergoes clarification and homogenization stages before flowing into the working section of the glass melting furnace, where the glass surface is stable. An online glass melt conductivity meter can be installed in a specific area of ​​the working section, where the temperature is relatively stable.

[0027] 3. Based on the relationship between electrical conductivity and blast furnace slag content and melting temperature (1), substitute the blast furnace slag content and melting temperature in Table 1 into equation (1) to calculate the standard electrical conductivity value of the glass melt, as shown in Table 1.

[0028]

[0029] Wherein, electrical conductivity δ is in mS / cm, melting temperature T is in ℃, and blast furnace slag content C is in wt%.

[0030] The conductivity of the glass melt under the corresponding conditions was tested using an online glass melt conductivity meter (i.e., the real-time monitoring conductivity value of the glass melt), and the results were recorded as shown in Table 1.

[0031] Table 1

[0032]

[0033]

[0034] 4. Compare the real-time monitored conductivity values ​​of the glass melt in Table 1 with the standard conductivity values ​​calculated according to formula (1). If the real-time monitored conductivity value of the glass melt is close to the standard value of the glass melt conductivity at this time, and is within the standard deviation range of ±5mS / cm, it indicates that the uniformity of the glass melt meets the requirements and the next stage of the forming process can be carried out. If the real-time monitored conductivity value of the glass melt deviates from the standard value of the glass melt conductivity at this time and is outside the standard deviation range, it indicates that the uniformity of the glass melt does not meet the requirements. The relevant data can be fed back to the operator to adjust the front-end process (stirring, glass melt reflux, etc.) until the conductivity of the glass melt meets the requirements before the next stage of the forming process can be carried out.

[0035] The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make several improvements and modifications without departing from the inventive concept of the present invention, and these all fall within the protection scope of the present invention.

Claims

1. A method for determining the high-temperature mixing uniformity of blast furnace slag microcrystalline glass melt, characterized in that... The main steps are as follows: (1) Determine the blast furnace slag content and melting temperature of the glass melt to be tested; (2) Substitute the blast furnace slag content and melting temperature of the glass melt to be tested into the relationship in equation (1) to obtain the standard value of the electrical conductivity of the glass melt to be tested; equation (1) is the relationship between electrical conductivity and blast furnace slag content and melting temperature, where electrical conductivity δ is in mS / cm; melting temperature T is in °C; blast furnace slag content C is in wt% (3) Compare the online conductivity of the glass melt to be tested with the standard conductivity value obtained in step (2). If the difference between the two is within ±5 mS / cm, the high-temperature mixing uniformity of the glass melt meets the requirements; if the difference between the two is outside ±5 mS / cm, the uniformity of the glass melt does not meet the requirements. The raw material components of the microcrystalline glass include blast furnace slag, quartz sand, soda ash, borax, and crystal nucleating agent TiO2. The proportion of blast furnace slag varies in the range of 55-75 wt%, and the mass ratio of quartz sand, soda ash, borax, and titanium dioxide is 25:5:3:

2.

2. The method for determining the high-temperature mixing uniformity of blast furnace slag microcrystalline glass melt according to claim 1, characterized in that... The online conductivity in step (3) is obtained by a conductivity meter set on the liquid surface of the cooling section of the glass melting furnace.

3. The method for determining the high-temperature mixing uniformity of blast furnace slag microcrystalline glass melt according to claim 1, characterized in that... The proportion of blast furnace slag in the glass melt varies from 55 to 75 wt%, the melting temperature is in the range of 1410 to 1480℃, and the corresponding electrical conductivity of the glass melt is in the range of 340 to 630 mS / cm.

Images