A METHOD FOR REDUCING METHYLENE BLUE VALUE IN FINE AGGREGATES

Abstract

The present invention relates to a method for reducing methylene blue content in fine aggregates (i.e., material passing through a 5 mm sieve) such as natural and crushed sand used in the production of concrete, asphalt, mortar, and construction chemicals. Unlike conventional practices, this method achieves methylene blue values ​​below 1 g / kg, as required for fine aggregates in concrete and asphalt production, without the use of water and without producing sludge waste. According to the invention, the method involves heat treatment of the fine aggregates in rotary or stationary kilns at temperatures ranging from 400°C to 800°C and for a maximum duration of minutes, depending on their mineralogical and thermal properties, thereby reducing the methylene blue content to a level that meets the relevant standards.

Description

1 TARIFF A METHOD FOR REDUCING METHYLENE BLUE VALUE IN FINE AGGREGATES TECHNICAL FIELD The present invention relates to the field of building materials. Specifically, the invention covers concrete, asphalt, mortar and other construction materials. Methylene blue 5 is found in fine aggregates such as natural and crushed sand used in the production of chemicals. It is related to methods aimed at reducing its value. PREVIOUS TECHNIQUE In the construction industry, fine aggregates such as natural and crushed sand are used in the production of concrete, asphalt, and mortar. These are the basic components used. The quality of these fine aggregates determines the quality of the resulting building materials. It significantly affects its durability and performance. One of the key quality indicators is 10 Measuring the amount of clay and mica minerals in fine aggregates and their water absorption capacity. This is the methylene blue value. The methylene blue value is defined in EN 933-9:2022 (Geometric properties of aggregates). (Experiments for - Part 9: Evaluation of fine materials - Methylene blue test) standard It is determined according to the standard mentioned. The standard in question involves treating the fine fraction of aggregates with methylene blue. It is used to test the reaction. This experiment is particularly useful for testing the reaction of clay and / or mica in aggregates. It is used to determine the mineral content and to evaluate the cleanliness of aggregates. It is helpful. The methylene blue test involves adding a methylene blue solution to a specific volume of aggregate sample and This is achieved by mixing the mixture for a specific period of time. As a result of the experiment, a methylene blue is produced. The blue value is obtained. The aforementioned standard controls the quality of building materials. 20 This constitutes an important method for ensuring its reliability and quality. High methylene MBV values ​​indicate the presence of higher amounts of clay and / or mica minerals. This situation negatively affects the performance of the aggregate in construction applications. It can have an impact. Reducing MBV improves the mixing and placement of concrete, It increases compressive strength and resistance to frost, de-icing salts, and other environmental factors. It improves. Lower MBV provides better aggregate cohesion and reduces the risk of shrinkage and cracking. This reduces stress, thereby extending the service life of concrete structures and providing higher structural integrity. This is achieved through washing, drying, adsorption, chemical treatments, and sandblasting to reduce MBV. Various methods can be used, including sand blending and sand mixing. 2 Traditionally, the methylene blue value of fine aggregates is determined by the removal of clay and other impurities. through washing and scrubbing processes that use large amounts of water for this purpose These methods are being reduced. While effective, they produce significant amounts of wastewater and have environmental impacts. This requires proper disposal procedures to prevent pollution. Furthermore, the aforementioned procedures... The high water content reduces sustainability, especially in water-scarce regions. Methylene 5 To reduce the blue color and remove very fine clay and silt particles, a fine process is used. Washing aggregates leads to the following problems: - Water consumption and pollution of water resources; - Energy requirement for recycling the muddy water within the system; - Risk of muddy water escaping the system and polluting riverbeds; 10 - The formation of sludge waste, leading to production loss and increased environmental damage. - Increased production costs. Some fine aggregate samples still contain residual clay and / or mica minerals, even after the washing process. Therefore, the desired methylene blue values ​​cannot be achieved, and this situation has led to the following results: This leads to: 15 - Increasing the use of cement is necessary to achieve the target strength in the produced concrete. increasing costs and CO₂ emissions; - Despite increased cement and additive use, the expected target for some concrete grades has not been reached. failure to achieve the required strength; - The increasing use of chemical additives in concrete and the fact that some fine aggregates are resistant to these additives... his lack of response; - Premature setting of the concrete or poor pumpability, and - The absence of very fine material in washed sand improves the workability of concrete. Increasing the use of natural sand in order to improve [the quality of] sand production. In addition, through the aforementioned washing process, stone dust / filler materials from natural or crushed sand can be 25%. unwanted removal of these from hot mix asphalt, mortar and construction chemicals Because they are critical for quality in production, their reintegration into the system is essential. It makes it possible. Recent studies and developments in this field have shown that the methylene blue value in aggregates... The use of chemical processes and adsorption techniques to reduce contamination is being investigated. 30 For example, iron-based nanoparticles and other adsorbents can remove methylene blue from aqueous solutions. 3 They are being tested in terms of their removal capabilities, and this can be done without intensive water use. It presents potential methods for processing aggregates. However, the aforementioned These methods often involve the use of complex equipment and precise chemical reactions. This requires monitoring and necessitates significant infrastructure investment and technical expertise. is giving rise to and therefore less than 5 in terms of large-scale applications in the construction sector. It is feasible. Among previous technical guidelines, GB2609224A specifically addresses clay contaminants and other harmful substances. a device for processing aggregate material for the purpose of removing materials It explains that the device in question is tilted at a specific angle and mounted on a chassis. It includes a chute and is equipped with angled vanes for material handling and abrasion. It includes rotatable shafts. A weir located within the chute increases the material retention time and By increasing the water level, the device increases the dwell time and friction efficiency. The device, water It includes spray bars for addition, a discharge opening and a dewatering screen. The configuration involves adjusting the height angle and weir position for processing optimization purposes. It provides the opportunity. 15 US2020062649A1, control of clay impurities in construction aggregates and cementitious compositions. It describes a method for processing clay-containing aggregates into acetate, and this method involves processing clay-containing aggregates into acetate. and dialkylamine and epichlorohydrin ions, both containing chloride ions, have anionic groups. It involves the step of treating a modified polycondensate with molar anionic groups. Based on concentration, the acetate content is between 51-99%, preferably between 60-95%, 20 This ensures that chloride ionic groups are present at a minimum level. US10669200B2, heat treatment using fine sand or rounded sand as starting material. This describes a method and equipment for producing artificially crushed sand through solar energy. conventional solar power systems operate using beamed or converted or stored solar energy. The sand grains are heated to their melting point using a melting device. The heated sand grains are then placed in three 25 They are melted together to form a three-dimensional intermediate product, then cooled and reduced to 2 mm. It is crumbled to a very small particle size. The final product has a certain shape and surface roughness. It differs from the starting material in terms of the demand for crushed sand. It offers a long-term solution for meeting the demand and supplying sand for the construction industry. This method requires a minimum temperature of 1700°C, and in some cases 30°C, to form new grain boundaries. This requires temperatures reaching up to 1810°C, and solar-based methods are generally preferred. It can reach temperatures above 2000°C but does not offer precise control. 4 Priyadharshini P. et al. reported that the excavated soil from tunnel excavations exhibits high plasticity. Thermal treatment temperature and its properties for use as fine aggregate in cement mortar It refers to a study examining the effect of duration. In the study in question, the excavation mentioned... The soil is heated to temperatures between 200–1000°C for periods of 30 to 180 minutes and then used in cement mortar. Its suitability is being evaluated in this regard. The article states that 25–40% of the excavated soil mentioned is 5%. It contains a certain percentage of clay minerals, mainly kaolinite, illite, and montmorillonite. It is reported (May 2019, Journal of the Construction Division 31(8), DOI:10.1061 / (ASCE) MT.1943-5533.0002759). In conclusion, the aforementioned traditional methods, particularly the use of natural sand in concrete production, or in terms of crushed sand, solid industry 10 prescribed by the European Union for aggregates. Reducing methylene blue levels to a level that meets standards is effective in most cases. It cannot be provided with an approach that is applicable on an industrial scale. Therefore, in fine aggregates A more efficient approach that can be easily implemented on a large scale to reduce methylene blue levels. A cost-effective and environmentally sustainable method is needed. BRIEF DESCRIPTION OF THE INVENTION 15 The main objective of the present invention is to address the issues associated with conventional washing processes in aggregate processing. reducing operating costs and negative environmental impact while processing fine aggregates without using water. The aim is to provide a method to reduce the methylene blue value. Another purpose of the invention is to develop thinner materials used in the production of concrete, asphalt, and other building materials. methylene blue 20 improves the quality and performance of aggregates and produces sludge waste. by reducing its value to below 1 g / kg, it complies with the European Union Aggregate Standards for Concrete (MB1 category, The goal is to provide a method that meets BS EN 12620, 2013. Another purpose of the invention is to wash away fine clay and silt-sized particles from fine aggregates. and to provide a method that eliminates the need for separation. Another purpose of the invention is to produce thin 25-inch concrete used in the production of concrete, asphalt, and other building materials. The goal is to provide a system that improves the quality and performance of aggregates. Another purpose of the invention is to reduce the amount of cement required in concrete production and hot mix asphalt. reducing the amount of bitumen required in production and thus increasing the sustainability of construction applications. It provides a method that increases it. To achieve the purposes stated above, the present invention uses natural or crushed sand, such as 5 Aggregates with a grain size smaller than mm, depending on their mineralogical and thermal properties A rotary or stationary oven at a temperature range of 400°C to 800°C for a duration of up to 15 minutes. It provides a method and system that involves subjecting the material to heat treatment in a heat treatment unit such as this. The method described in the invention, unlike traditional practices, does not use water and does not involve sludge waste. 5 Without production, it ensures that the methylene blue value of fine aggregates is reduced to below 1 g / kg; It meets the European Union Aggregate Standards for Concrete (MB1 category, BS EN 12620, 2013) and It enables the efficient production of fine aggregates for concrete, asphalt, and construction chemicals. He knows. Furthermore, the method described in the invention eliminates the need for washing, thus allowing for the processing of fine clay and 10 It prevents the separation of silt particles (smaller than 63 microns) and filler materials (stone dust). This prevents the removal of fine aggregates. The aforementioned filler materials are either natural or... By retaining the crushed sand within the existing method, additional natural sand is added to the concrete. This reduces or eliminates the use of hot mix asphalt, mortar and construction materials. This is critically important for maintaining the quality of chemicals. 15 In conclusion, the method, compared to the previous technique, screens various natural sand, gravel, or crushed stone. effective and rapidly reducing the required amounts of cement and bitumen while improving the quality of concrete and asphalt. This reduces the production of high-quality concrete, especially in earthquake-prone regions. This is of great importance in this respect. The term "reduction" mentioned above refers to the reduction of clay and / or mica. It refers to the transformation of minerals into more stable and non-absorbent forms. This and other aspects of the present invention, its structural and characteristic features, advantages and applications The figures are more clearly explained with detailed descriptions, examples, and references to related figures presented below. It will be understood. BRIEF DESCRIPTION OF THE FIGURES 25 Figure 1 shows the invention method for reducing methylene blue levels in fine aggregates. It shows a process flow diagram. Figures 2a-d show the natural sand samples from Sample 1 and the methylene blue test results for these samples. It shows the results, including the conditions before and after heat treatment. Figures 3a-d show the experimental results for crushed sand and methylene blue from Sample 2. 30 6 The reference numbers in the figures correspond to the following components / process steps: 1. Fine aggregates fed into the system 2. Crushing tools for breaking larger stones and pebbles. 4. Sieving tools for separating finer particles. 6 Classifiers for consistent grain size distribution 5 8. Fine aggregates that meet MB1 values ​​for industrial use. Conveyor Heat treatment unit (rotary or stationary furnace) Heating appliances 40 Air flow system 10 50 Control units 60 Cooling units 70 Collection units 100. Step for obtaining / providing fine aggregates. 200 Feeding step of fine aggregates 15 300 Heat treatment steps 400 Cooling Steps 500 addition steps DETAILED DESCRIPTION OF THE INVENTION The present invention applies to the production of concrete, asphalt and other building materials, especially natural and 20 A study aimed at reducing methylene blue levels in fine aggregates, including crushed sand. The method provides a way to subject aggregates to thermal treatment without the use of water. It contains, thus eliminating the need for washing and sludge waste. This process prevents its formation. The process reduces the methylene blue value to below 1 g / kg and European Union standards for concrete aggregates (MB1 category, BS EN 12620, 2013) 25 It meets the needs. Fine aggregates are mainly natural sand, gravel or crushed stone produced from screening plants and This refers to materials that pass through a 5 mm sieve, including crushed sand. The aforementioned fine material... Aggregates are fed into the system via a conveyor (10) and thus to a temperature range of 400°C to 800°C. Continuous and controlled supply of aggregate to a heat treatment unit (20) where they are exposed to temperatures 30 is provided. The specified temperature range optimizes production costs and methylene blue. 7 It is being designed to reduce its value to the MB1 category more effectively and quickly, above 800°C. Higher temperatures can also reduce the methylene blue value, but to a lesser extent. It is feasible. Processing time depends on the mineralogical and thermal properties and moisture content of the aggregate. It varies. The maximum waiting time is 15 minutes. For example, the moisture content of the sand is 5 by weight. If it is less than 10%, the waiting time is reduced to a maximum of 5 minutes. The optimum determined here is... In this way, while achieving the desired reduction in methylene blue levels, energy costs are also minimized. This allows for the following: For sands with a moisture content between 10% and 25%, the waiting time is 8 days. This takes up to a minute. For sands with a moisture content between 25% and 50%, it takes up to 12 minutes. Processing is required. For sands containing more than 50% moisture, the required methylene blue according to the invention is 10. To allow for a reduction in value, the waiting period can be up to 15 minutes. The heat treatment unit in question (20) is either a rotary or stationary furnace, depending on the specific requirements of the process. It is possible. Heating devices (30) located inside the furnace (20) ensure that the aggregates are heated to the desired temperature. The mentioned heating devices (30) provide the necessary heat to reach the required temperature. They can be electric or gas-fired and have an energy efficiency of 15 to meet high thermal demands. They are designed with this in mind; thus ensuring that the aggregates reach predetermined temperatures. An air flow system (40) ensures homogeneous heat distribution inside the oven (20) and It ensures that all aggregates are processed equally. The control unit (50), which includes a temperature sensor and a timer, monitors the moisture content of the aggregates. It adjusts the heat treatment procedures according to the mineralogical and thermal properties. This delicate 20 The control optimizes energy consumption and achieves the desired reduction in methylene blue levels. It provides. After heat treatment, the aggregates are brought to a temperature at which they can be safely processed in a cooling unit (60). It can be cooled down or left to cool freely in the atmosphere. Cooling unit (60), Depending on specific requirements and environmental conditions, air cooling systems, water cooling 25 These may include cooling systems or free cooling systems. This step ensures safe operation and subsequent processes. This is critical in terms of processes and prevents thermal damage from occurring in aggregates. Treated The aggregates are collected and stored in a collection unit (70) for subsequent use; Reduced methylene blue is suitable for chilled aggregates, concrete, asphalt, and other construction applications. It has the values ​​and meets strict quality standards. Collection unit (70), 30 before aggregates are shipped for use in concrete, asphalt or other building materials 8 This may include storage containers or bunkers where it is temporarily held. Collection The mechanism ensures that the quality of the aggregates is preserved in a controlled environment until the moment of use. It ensures its preservation. According to a preferred arrangement of the invention, the method involves the use of no water (sand washing). (without requiring a process) includes the following steps: 5 - Step of obtaining / providing fine aggregates (100) - Feeding step of fine aggregates (200) - Heat treatment step (300) - Cooling step (400) - Addition step (500) 10 In the aforementioned procurement / obtaining step (100), fine aggregates are various natural sand, gravel or They are produced or supplied from crushed stone screening plants. The aforementioned aggregates are the subject of the invention. Essentially, they are smaller than 5 mm in size and are used in concrete, asphalt, and other construction applications. It meets the necessary criteria for fine aggregates. Achieving a target particle size smaller than 5 mm. In order to achieve this, the said method involves breaking larger stones and pebbles (2), and finer ones 15 Sieving is done to separate the particles (4) and to ensure a consistent particle size distribution. It may also include preparatory steps known in the previous technique, such as the use of classifiers (6); Specifically, particles that pass through a 5 mm sieve are selected and used. In the mentioned feeding step (200), fine aggregates, namely natural or crushed aggregates, pass through a 5 mm sieve. Sand is fed into the system using a conveyor (10). 20 In the mentioned heat treatment step (300), fine aggregates are treated, preferably in an air atmosphere, for mineralogical and Depending on its thermal properties, at temperatures ranging from 400°C to 800°C and for a maximum of 15 minutes. For example, it is subjected to heat treatment in a rotary or stationary furnace (20) for a period of time that is effective. For every 10% increase in the moisture content of the fine aggregates, the processing time should preferably be 2 to 5 minutes. The duration is being increased, and the maximum duration is up to 15 minutes. 25 In the mentioned cooling step (400), the heat-treated aggregates are safely to ensure they can be processed and used in subsequent processes in a manageable way It is cooled to a certain temperature. In the mentioned collection step (500), it is cooled and processed. processed fine aggregates are used in the production of concrete, asphalt and other building materials. are being collected and stored. 30 9 Consequently, according to the invention, the method described eliminates the need for washing and separation processes. by removing, reducing operating costs and environmental impact while improving the quality of fine aggregates. It improves performance. The method does not necessarily involve an aggregate preheating step. It is applicable. To demonstrate the practical application and advantages of the current invention, 5 laboratory-scale experiments were conducted. The following examples are presented. These examples illustrate specific application forms of the invention. It aims to demonstrate this and should not be interpreted as limiting its scope. EXAMPLE 1: A natural sand with an initial methylene blue value greater than 5.5 g / kg (MB5.5 category). The sample (1) is subjected to heat treatment at 500°C for a maximum of 5 minutes. After the treatment The methylene blue value drops below 1 g / kg (MB1 category). The processing time is 10 minutes out of 5. Extending the exposure beyond this point or increasing the temperature further reduces the methylene blue value. When the temperature is below 500°C, the decrease in methylene blue levels is negligible. is happening. The experimental results for natural sand and methylene blue from Sample 1 are shown in Figures 2a-d. Figures: (a) natural sand sample before heat treatment (1), (b) natural sand sample after heat treatment 15 (8), (c) methylene blue test result for natural sand before heat treatment and (d) natural sand after heat treatment This shows the methylene blue test result for sand. EXAMPLE 2: A crushed sand sample with an initial methylene blue value greater than 6 g / kg (1), (due to its relatively higher muscovite and chlorite mineral content, it is the heaviest mineralogical (representing one of the conditions) it is subjected to heat treatment at 800°C for 5 minutes and 20 The methylene blue value is reduced to 0.5 g / kg. When the same sample is processed at 650°C, The methylene blue value drops to only 4 g / kg. The processing time at 650°C is reduced to 15 minutes. Even removal does not reduce the methylene blue value below 4 g / kg. This situation indicates optimum This shows that both temperature and time are important in terms of obtaining results. The experimental results for crushed sand and methylene blue from Sample 2 are shown in Figures 3a-d. This 25 Figures: (a) crushed sand sample before heat treatment (1), (b) crushed sand sample after heat treatment (8), (c) methylene blue test result for crushed sand before heat treatment and (d) crushed sand after heat treatment This shows the methylene blue test result for sand. In conclusion, the invention represents a new, efficient method for reducing methylene blue content in fine aggregates. and offers an environmentally sustainable method. By eliminating water usage and 30 By preventing sludge waste, this method significantly reduces operating costs and environmental impact. It ensures the production of high-quality building materials. Especially the advantages provided by the invention. This includes, but is not limited to, the following: - Reduced Water Consumption: Eliminates water usage in the aggregate cleaning (washing) process. By removing it, it protects water resources. - Lower Energy Consumption: Eliminates the need to recycle muddy water. By removing it, it reduces energy consumption. - Environmental Protection: Preventing the risk of muddy water escaping into natural aquatic environments and mud 5 It reduces waste production. - Prevention of Sludge Waste: Preventing production loss by preventing the formation of sludge waste. and minimizes environmental damage. - Cost-effectiveness: Production by eliminating water usage and sludge waste management. It reduces costs. 10 - Improved Aggregate Quality: Ensuring the production of high-quality fine aggregates and structure It improves the performance of the materials. - Consistency in Cement and Additive Use: Excessive cement in achieving desired methylene blue values and ensures that it is obtained without the need for chemical additives, thus improving quality. It maintains its consistency and reduces CO₂ emissions. 15 - Improved Processability: Retains fine particles and stone dust within the aggregates. This improves the workability of concrete and reduces the need for natural sand. - Applicability to various building materials: Especially high-quality building materials In earthquake-prone regions where it is critical, concrete, hot-mix asphalt, mortar, and construction materials are used. It is beneficial for the production of chemicals. 20 Specific examples and applications of the present invention have been described above, although in the field... Various changes and modifications by experts without deviating from the essence and scope of the invention And it is clear that adaptations can be made. For example, the feeding mechanism, the heat treatment of fine aggregates. It includes a hopper for initial aggregate intake before it is conveyed to the unit. During heat treatment, the furnace... Injecting inert gases such as nitrogen or argon into the atmosphere increases the methylene blue value to 25. It can improve processes such as reducing and preventing oxidation inside the furnace. Sensor systems are integrated for monitoring and controlling temperature, flow rate, and chemical composition. This is possible. Furthermore, it allows for optimizing process parameters and achieving high precision and efficiency. To achieve this, automated control units and advanced algorithms can be included. Therefore, the claims presented in the annex demonstrate that such changes, modifications, and adaptations are protected under Article 30. by ensuring that it remains within the scope, the integrity and intended scope of the invention are preserved. is doing.

Claims

11 REQUESTS 1. Methylene blue in fine aggregates for use in concrete, asphalt and other building materials. It is a method aimed at reducing the value to below 1 g / kg, - The aforementioned fine aggregates are stored in a temperature range of 400°C to 800°C for a maximum of 15 minutes. This involves subjecting the material to heat treatment in a heat treatment unit for a specified period of time; 5 - The aggregates mentioned herein have a maximum particle size of 5 mm; - The aggregates mentioned herein mainly consist of natural sand or crushed sand and – This method does not include any aggregate washing process.

2. The method is as per Claim 1, and the method in question does not involve the use of water and thus By eliminating the need for washing, it prevents the formation of sludge waste. 10 It is characterized by...

3. The method is in accordance with Claim 1, where the moisture content of the aforementioned fine aggregates is less than 10% by weight. It is characterized by its low temperature and a maximum heat treatment time of 5 minutes.

4. The method is according to Claim 1, and the moisture content of the mentioned fine aggregates is between 10% by weight. Characterized by having a concentration between 25% and a maximum heat treatment time of 8 minutes. is being done.

5. The method is according to Claim 1, and the moisture content of the mentioned fine aggregates is between 25% by weight. It is characterized by having a concentration of between 50% and a maximum heat treatment time of 12 minutes. is being done.

6. The method is according to Claim 1, where the moisture content of the mentioned fine aggregates is between 50% and 20% by weight. It is characterized by its high volume and a maximum heat treatment time of 15 minutes.

7. The method is in accordance with Claim 1, and furthermore; the aforementioned fine aggregates are natural sand, gravel or crushed stone. obtaining stones from stone screening plants or crushing larger stones and pebbles, more Sieving is necessary to separate fine particles, especially those passing through a 5 mm sieve. 25 to ensure consistent grain size distribution by using particles This involves generating it through traditional approaches such as the use of classifiers. It is characterized by... 12 8. The method according to Claim 1 is characterized by including the following steps: is being done; - Sand, gravel, or crushed stone obtained from screening plants and passing through a 5 mm sieve. The aforementioned fine aggregates are fed into a heat treatment system; - The aforementioned fine aggregates will undergo thermal treatment in a heat treatment unit at a temperature range of 400°C to 800°C. being processed; - The aforementioned aggregates should be kept in the heat treatment unit for a maximum of 15 minutes and – Thus, the methylene blue value for the aforementioned aggregates subjected to heat treatment is 1. European Union standards for concrete aggregates by ensuring that it is reduced to below g / kg standards (MB1 category, BS EN 12620, 2013) and concrete, asphalt and other construction 10 materials that meet similar standards for use.

9. The method according to Claim 1 is that the aggregates mentioned are processed in a rotary or stationary kiln, with the moisture content reduced. depending on its contents, it should be kept at a temperature range of 400°C to 800°C for a certain period of time. the duration should be increased by 2 to 5 minutes for every 10% increase in moisture content, and the maximum It is characterized by the fact that the duration can be up to 15 minutes. 15 10. This method, according to Claim 1, is characterized by including the following steps: is being done; - The aforementioned aggregates, which have been subjected to heat treatment, must be brought to a suitable temperature for safe use. cooling down to that extent and - The aforementioned chilled aggregates are used in concrete, asphalt and other building materials. 20 Collecting for use.

11. Methylene blue in fine aggregates for use in concrete, asphalt and other building materials. to reduce its value to below 1 g / kg, without using water and without producing sludge waste. It is a functioning system, characterized by including the following: - The aforementioned fine aggregates are subjected to condensation in the temperature range of 400°C to 800°C for a maximum of 15 minutes. a heat treatment unit to operate for a specified period; - Natural sand, gravel, or crushed stone obtained from screening plants and with a grain size of no more than 5 mm. a system for feeding the aforementioned fine aggregates, which have a certain size, into the heat treatment unit feeding mechanism and 13 - The heat treatment time depends on the moisture content of the aggregates mentioned, as well as their mineralogical and thermal properties. a system that includes a temperature sensor and a timer to regulate according to its specifications control unit.

12. The system is in accordance with claim 11 and also ensures the safety of the aforementioned heat-treated aggregates.

5. It includes cooling devices to cool it down to a suitable temperature for use. It is characterized by...

13. The system is in accordance with claim 11 or 12, and also includes the aforementioned chilled aggregates in concrete and asphalt. and a collection mechanism for collecting other building materials for use. It is characterized by its inclusion.

14. The system is in accordance with any of claims 11 to 13, and the mentioned heat treatment unit is a 10 It is characterized by having either a rotary or a stationary oven.

15. The system is according to any of claims 11 to 14, and the mentioned control unit is 400°C The heat treatment time and temperature range from 800°C depends on the moisture content of the aggregates. It includes tools for adjusting the feed and the moisture content during the specified period. For a 10% increase, the duration should be increased by 2 to 5 minutes, with a maximum duration of up to 15 minutes. It is characterized by...

16. The system is according to any of claims 11 to 15, and the mentioned feeding mechanism It is characterized by containing a conveyor belt.

17. The system is based on any of claims 11 to 16, and the aforementioned summation mechanism 20 characterized by containing a storage enclosure for chilled and processed aggregates. is being done.

18. The system is in accordance with any of claims 11 to 17, and the cooling devices mentioned are one of them. by including an air cooling system, a water cooling system or a free cooling system It is characterized by...

19. The system is based on any of claims 11 to 18, and the mentioned supply mechanism is 25 It is characterized by containing a reservoir for the initial aggregate intake before transmission.

20. The system is in accordance with any of claims 11 to 19, and the details of the mentioned heat treatment unit are as follows: Tools for homogeneous heat distribution to ensure consistent processing of aggregates. It is characterized by its inclusion.