Method for recycling chlorination furnace blow-off tailings
By cleaning, drying, crushing, calcining, screening, and ball milling the tailings from the chlorination furnace, they are transformed into dielectric microwave absorbing materials, solving the environmental and resource utilization problems of tailings reuse and achieving efficient resource recycling and economic benefits.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- ASICHUANG TITANIUM IND (YINGKOU) CO LTD
- Filing Date
- 2024-01-16
- Publication Date
- 2026-06-05
AI Technical Summary
The reuse of tailings from chlorination furnace blow-out materials is complex, involving composition, content, and physicochemical properties. Existing technologies are insufficient to effectively address its environmental protection and resource utilization issues.
The tailings are transformed into dielectric microwave absorbing materials through steps such as washing, drying, crushing, sealed oxygen-free calcination, screening, ball milling and mixing. This includes removing impurities, controlling the heating environment, selecting appropriate particle size and using inert gas to ensure an oxygen-free environment, and finally mixing with a binder.
It realizes the resource utilization of tailings, reduces accumulation and environmental pollution, expands the application field, reduces processing costs, and brings economic benefits. It is suitable for dielectric absorbing materials.
Smart Images
Figure CN117983633B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of tailings treatment technology, and in particular to a method for reusing tailings from chlorination furnace blow-out materials. Background Technology
[0002] The reuse of tailings from chlorination furnace blowdown is a complex issue involving many factors, such as the composition, content, physical and chemical properties of the tailings, and the desired reuse goals. Here are some possible reuse pathways: Extraction of valuable metals: Tailings may contain valuable metals such as copper, gold, and silver. These metals can be extracted through mineral processing, chemical leaching, and other methods, followed by further processing and recycling. Production of building materials: Some components of tailings can be used to produce building materials such as cement and bricks. These materials have economic value and can be used in construction, road projects, and other engineering projects. Preparation of ceramic products: Some components of tailings can be used to prepare ceramic products such as pottery and porcelain. These products have broad application prospects in home decoration, tableware, and other fields. Production of composite materials: Some components of tailings can be combined with other materials to prepare composite materials, such as glass fiber reinforced plastics. These materials can be used to manufacture various lightweight and high-strength products, such as automotive parts and aerospace equipment. Cement production: Tailings can be used to produce cement. The principle is to utilize the silica, alumina, and other components contained in the tailings to react with limestone to generate silicate cement. Microcrystalline glass production: Microcrystalline glass is a high-performance building material with excellent physical, chemical, and decorative properties. Tailings contain abundant mineral components, which can be used in the production of microcrystalline glass. Concrete aggregate production: Tailings can be used to produce concrete aggregate. The principle is to utilize the natural sand and stone powder in the tailings to prepare high-performance concrete aggregate. In the invention application CN201510678010.5, which describes a method for recovering rutile-containing waste from the chlorination furnace of titanium dioxide produced through the chlorination process, the method involves a desliming and impurity removal process. This process generates a large amount of tailings with complex compositions. Long-term stockpiling of these tailings as solid waste poses environmental problems. Developing their properties and finding application areas would greatly solve this problem. Since petroleum coke (mainly composed of carbon) is used as a catalyst in the chlorination process, these substances are discharged from the furnace along with the blown material. Therefore, the process of extracting rutile from the blown material will discharge tailings containing a large amount of carbon-containing substances. At the same time, titanium dioxide will also exist as an entrainment in the tailings. From the composition, the tailings are mainly composed of carbon and titanium dioxide, both of which can be used as dielectric microwave absorbing materials. If the tailings are used for microwave absorbing materials through certain treatment methods, the enterprise's zero-emission goal can be achieved. Summary of the Invention
[0003] The main objective of this invention is to provide a method for reusing tailings from chlorination furnace blow-out materials, which can effectively solve the problems in the background art.
[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:
[0005] A method for reusing tailings from a chlorination furnace includes the following steps:
[0006] S1. First, the tailings, which are mainly composed of carbon and titanium dioxide, are collected.
[0007] S2. Next, the tailings composed of carbon and titanium dioxide collected in step S1 are washed to remove impurities from the tailings composed of carbon and titanium dioxide.
[0008] S3. Place the cleaned and impurity-removed tailings, which consist of carbon and titanium dioxide, into a zirconium oxide crucible for drying. The drying temperature is 120℃-150℃. After the tailings are dried, remove them for later use.
[0009] S4. Place the dried tailings obtained in step S3 into a crusher for crushing, thereby breaking down the large particles in the dried tailings.
[0010] S5. The tailings powder from step S4 is loaded into a cylindrical crucible for sealed oxygen-free calcination. When loading the tailings powder into the cylindrical crucible, it must be fully loaded and covered. During the oxygen-free calcination process, the heating rate inside the cylindrical crucible must be kept ≤5℃ / min. When the temperature inside the cylindrical crucible rises from room temperature to 1200±50℃, the cylindrical crucible is then kept at the temperature for 4 hours and then cooled with the furnace.
[0011] S6. The calcined tailings powder is placed into a 200-mesh sieve for sieving to remove coarse particles from the tailings powder, and then the tailings powder is purified.
[0012] S7. The tailings powder purified in the above steps is put into a ball mill for ball milling, so that the tailings powder is ball milled to the required particle size.
[0013] S8. Finally, the tailings powder from the ball mill is mixed with a binder to control the composition requirements through mixing.
[0014] Preferably, in step S1, the method for collecting tailings is to separate useful minerals such as gold, silver, copper, and iron from the tailings through mechanical and chemical methods, such as gravity separation, flotation, and chemical leaching, thereby reducing the content of harmful substances.
[0015] Preferably, in step S3, when drying the tailings composed of carbon and titanium dioxide, the tailings need to be properly pretreated before being placed into the zirconium oxide crucible to avoid the chemical reaction between titanium dioxide and carbon at high temperature, which would affect the drying effect.
[0016] Preferably, in step S4, a cone crusher can be used to crush the dried tailings.
[0017] Preferably, in step S5, before loading the tailings powder and sealing the crucible, it is necessary to ensure that the crucible is well sealed to prevent leakage of gas or harmful substances during calcination. The particle size of the tailings powder affects the calcination process and the performance of the final product. Therefore, tailings powder with an appropriate particle size should be selected, and it should be ensured that it is heated fully and evenly during calcination. At the same time, before sealing and calcining, oxygen in the crucible and the surrounding environment should be removed to ensure an oxygen-free environment, which can be achieved by using an inert gas or a vacuum environment.
[0018] Preferably, in step S6, when screening the calcined tailings powder, a vibrating screen with a 200-mesh sieve can be used for screening.
[0019] Preferably, in step S6, the tailings powder can be purified by methods such as chemical precipitation, solvent extraction, and ion exchange. At the same time, a magnetic separator can be used to remove ferromagnetic substances from the tailings powder. The purified tailings powder can reduce environmental pollution and is also conducive to resource recycling.
[0020] Preferably, in step S7, when ball milling the tailings powder, the tailings powder needs to be ball milled into particles of 200-400 mesh.
[0021] Preferably, in step S8, a stirring device can be used to mix the tailings powder that has been ball-milled.
[0022] Compared with the prior art, the present invention has the following beneficial effects:
[0023] This invention processes tailings through a series of steps including impurity removal, drying, crushing, calcination, screening, ball milling, and mixing. This allows the tailings to be used in dielectric microwave absorbing materials, reducing tailings accumulation and avoiding the waste of large amounts of land and resources. Furthermore, using tailings in dielectric microwave absorbing materials reduces environmental pollution and expands the application areas of tailings, benefiting related industries. Additionally, it reduces tailings treatment costs and brings economic benefits to relevant enterprises. Attached Figure Description
[0024] Figure 1This is a schematic diagram of the process flow for a method of reusing tailings from a chlorination furnace according to the present invention.
[0025] Figure 2 This is a phase analysis diagram of the powder material after processing.
[0026] Figure 3 A test curve of 200 mesh tailings powder;
[0027] Figure 4 A test curve of 400-mesh tailings powder;
[0028] Figure 5 The test results curve for 300 mesh tailings powder mixed with resin and molded at a ratio of 40% with a thickness of 2 mm.
[0029] Figure 6 Curve of test results for 400 mesh powder mixed with silicone rubber at a calendering ratio of 50% and a thickness of 1.8 mm. Detailed Implementation
[0030] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.
[0031] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 The method for reusing tailings from a chlorination furnace, as shown, includes the following steps:
[0032] S1. First, the tailings, which are mainly composed of carbon and titanium dioxide, are collected.
[0033] S2. Next, the tailings composed of carbon and titanium dioxide collected in step S1 are washed to remove impurities from the tailings composed of carbon and titanium dioxide.
[0034] S3. Place the cleaned and impurity-removed tailings, which consist of carbon and titanium dioxide, into a zirconium oxide crucible for drying. The drying temperature is 120℃-150℃. After the tailings are dried, remove them for later use.
[0035] S4. Place the dried tailings obtained in step S3 into a crusher for crushing, thereby breaking down the large particles in the dried tailings.
[0036] S5. The tailings powder from step S4 is loaded into a cylindrical crucible for sealed oxygen-free calcination. When loading the tailings powder into the cylindrical crucible, it must be fully loaded and covered. During the oxygen-free calcination process, the heating rate inside the cylindrical crucible must be kept ≤5℃ / min. When the temperature inside the cylindrical crucible rises from room temperature to 1200±50℃, the cylindrical crucible is then kept at the temperature for 4 hours and then cooled with the furnace.
[0037] S6. The calcined tailings powder is placed into a 200-mesh sieve for sieving to remove coarse particles from the tailings powder, and then the tailings powder is purified.
[0038] S7. The tailings powder purified in the above steps is put into a ball mill for ball milling, so that the tailings powder is ball milled to the required particle size.
[0039] S8. Finally, the tailings powder from the ball mill is mixed with a binder to control the composition requirements through mixing.
[0040] In step S1, the tailings are collected using mechanical and chemical methods, such as gravity separation, flotation, and chemical leaching, to separate useful minerals like gold, silver, copper, and iron, thereby reducing the content of harmful substances. In step S3, when drying the tailings composed of carbon and titanium dioxide, the tailings need to be properly pretreated before being placed in the zirconium oxide crucible to avoid a chemical reaction between titanium dioxide and carbon at high temperatures that could affect the drying effect. In step S4, a cone crusher can be used to crush the dried tailings. In step S5, before loading the tailings powder and sealing the crucible, it is necessary to ensure the crucible is well-sealed to prevent leakage of gas or harmful substances during calcination. The particle size of the tailings powder affects the calcination process and the performance of the final product; therefore, tailings powder of appropriate particle size should be selected, and it should be ensured that it is heated sufficiently and uniformly during calcination. Simultaneously, before sealing and calcining, oxygen should be removed from the crucible and surrounding environment to ensure an oxygen-free environment, achieved by using an inert gas or a vacuum environment. In step S6, when screening the calcined tailings powder… A 200-mesh vibrating screen can be used for sieving. In step S6, the tailings powder can be purified by methods such as chemical precipitation, solvent extraction, and ion exchange. Simultaneously, a magnetic separator can be used to remove ferromagnetic substances from the tailings powder. The purified tailings powder reduces environmental pollution and facilitates resource recycling. In step S7, when ball milling the tailings powder, it needs to be milled into 200-400 mesh particles. In step S8, a stirring device can be used to mix the ball-milled tailings powder. Tailings undergo a series of processes including impurity removal, drying, crushing, calcination, screening, ball milling, and mixing. Using tailings in dielectric microwave absorbing materials reduces tailings accumulation, avoids the waste of large amounts of land and resources, reduces environmental pollution, expands the application areas of tailings, benefits related industries, reduces tailings treatment costs, and brings economic benefits to relevant enterprises.
[0041] When combined with a binder, this ultrafine powder material can act as an electromagnetic wave absorber, effectively absorbing electromagnetic waves (RL < -10dB). Compared to coarse particles, the refined particles have a higher dielectric constant, enabling good absorption matching at lower concentrations. However, the actual application scenarios still need to be adjusted according to the type of binder and the specific applicable frequency band.
[0042] Obviously, the above embodiments are merely illustrative examples for clarity and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.
Claims
1. A method for reusing tailings from a chlorination furnace blowdown process, characterized in that, Includes the following steps: S1. First, the tailings, which are mainly composed of carbon and titanium dioxide, are collected. S2. Next, the tailings composed of carbon and titanium dioxide collected in step S1 are washed to remove impurities from the tailings composed of carbon and titanium dioxide. S3. Place the cleaned and impurity-removed tailings, which consist of carbon and titanium dioxide, into a zirconium oxide crucible for drying. The drying temperature is 120℃-150℃. After the tailings are dried, remove them for later use. S4. Place the dried tailings obtained in step S3 into a crusher for crushing, thereby breaking down the large particles in the dried tailings. S5. The tailings powder from step S4 is loaded into a cylindrical crucible for sealed oxygen-free calcination. When loading the tailings powder into the cylindrical crucible, it must be fully loaded and covered. During the oxygen-free calcination process, the heating rate inside the cylindrical crucible must be kept ≤5℃ / min. When the temperature inside the cylindrical crucible rises from room temperature to 1200±50℃, the cylindrical crucible is then kept at the temperature for 4 hours and then cooled with the furnace. S6. The calcined tailings powder is placed into a 200-mesh sieve for sieving to remove coarse particles from the tailings powder, and then the tailings powder is purified. S7. The tailings powder purified in the above steps is put into a ball mill for ball milling, so that the tailings powder is ball milled to the required particle size. S8. Finally, the tailings powder from the ball mill is mixed with a binder to control the composition requirements through mixing.
2. The method for reusing tailings from a chlorination furnace according to claim 1, characterized in that: In step S1, the method for collecting tailings is one of gravity separation, flotation, or chemical leaching, which separates the useful minerals from the tailings.
3. The method for reusing tailings from a chlorination furnace according to claim 1, characterized in that: In step S3, when drying the tailings composed of carbon and titanium dioxide, the tailings need to be pretreated before being placed into the zirconium oxide crucible.
4. The method for reusing tailings from a chlorination furnace according to claim 1, characterized in that: In step S4, a cone crusher is used to crush the dried tailings.
5. A method for reusing tailings from a chlorination furnace according to claim 1, characterized in that: In step S5, before loading the tailings powder and sealing the crucible, it is necessary to ensure that the crucible is well sealed, select the tailings powder and ensure that it is heated fully and evenly during the calcination process. At the same time, before sealing and calcining, oxygen in the crucible and the surrounding environment should be removed to ensure an oxygen-free environment, which can be achieved by using an inert gas or a vacuum environment.
6. A method for reusing tailings from a chlorination furnace according to claim 1, characterized in that: In step S6, when screening the calcined tailings powder, a vibrating screen with a 200-mesh sieve is used.
7. A method for reusing tailings from a chlorination furnace according to claim 1, characterized in that: In step S6, the tailings powder is purified by one of the following methods: chemical precipitation, solvent extraction, or ion exchange, while a magnetic separator is used to remove ferromagnetic substances from the tailings powder.
8. A method for reusing tailings from a chlorination furnace according to claim 1, characterized in that: In step S7, when using a ball mill to ball mill the tailings powder, the tailings powder needs to be ball milled into particles of 200-400 mesh.
9. A method for reusing tailings from a chlorination furnace according to claim 1, characterized in that: In step S8, the tailings powder after ball milling is mixed using a stirring device.