Iron removal system and method based on black talc

Abstract

The invention discloses an iron removal system and method based on black talc, the iron removal system comprises an iron removal module, a grinding module and a detection module, the iron removal module is used for removing iron impurities in a black talc material, the grinding module is used for grinding the black talc material subjected to iron removal treatment so as to meet the required particle size requirement, and the detection module is used for detecting the particle size of the black talc material subjected to iron removal treatment. The iron removal module is used for detecting ground black talcum powder, the iron removal module comprises a cone crusher, a dry ball mill, an acid pickling mechanism, a filter press, a screw extruder, a drying oven and a rotary kiln which are sequentially arranged in the working procedure sequence, and the acid pickling mechanism is composed of an acid pickling tank. According to the iron removal system and method based on the black talc, iron removal treatment is conducted on the black talc through oxalic acid, the oxalic acid can chemically react with iron ions to generate soluble complexes, and therefore iron impurities are effectively removed from the black talc, and an environment-friendly and effective method is provided for iron removal of the black talc.

Description

Technical Field

[0001] The invention relates to the technical field of mineral processing, in particular to a system and method for removing iron from black talc. Background Art

[0002] Iron is one of the two most common impurity elements in black talc. The content of iron impurities will directly affect the whiteness of black talc and its products, especially in the ceramic, plastic, rubber and other industries. High-whiteness talc powder can provide better product performance. Through iron removal treatment, the whiteness of black talc and its products can be significantly improved, thereby meeting the high standards of these industries for raw materials. In addition, the presence of iron as an impurity will also affect the purity and quality of black talc and its products. Through the iron removal process, the purity of black talc can be further improved to make it more in line with the production needs of downstream industries. Therefore, iron removal is an indispensable step in the processing of black talc.

[0003] In the process of implementing the present invention, the inventors found that there are at least the following problems in the prior art: Acid washing and iron removal is a common iron removal process in the talc industry. Most of the current iron removal processes choose hydrochloric acid or sulfuric acid as the acid compounds that react chemically with iron. However, in actual applications, after using hydrochloric acid to remove iron from black talc, as long as there is hydrochloric acid residual in the black talc, a large amount of acid mist will be generated during the sintering process, which will cause great damage to the kiln and cause serious corrosion to other equipment in the production process. In addition, the pollution problem is difficult to solve. If sulfuric acid is used to remove iron from black talc, as long as there is sulfuric acid residual in the black talc, sulfur dioxide gas will be generated during the sintering process, causing pollution to the atmosphere, which does not meet environmental protection requirements.

[0004] Therefore, the above technical problems need to be solved. Summary of the invention

[0005] In order to overcome the shortcomings of the prior art, the present invention proposes an iron removal system and method based on black talc, which solves the problem that in the current iron removal process, hydrochloric acid and sulfuric acid as acid compounds both have residual problems after iron removal. The residual hydrochloric acid will generate acid mist to damage kilns and other equipment, and the residual sulfuric acid will generate sulfur dioxide to pollute the atmosphere, both of which are difficult to meet environmental protection and production safety requirements.

[0006] In order to solve the above technical problems, the basic technical solution proposed by the present invention is: The iron removal system and method based on black talc include an iron removal module, a grinding module and a detection module arranged in sequence along the process sequence, wherein: The iron removal module is used to remove iron impurities in the black talc material. The grinding module is used to grind the black talc material after iron removal to achieve the required particle size requirements. The detection module is used to detect the ground black talc powder to check whether its whiteness meets the standard. The iron removal module includes a cone crusher, a dry ball mill, a pickling mechanism, a filter press, a screw extruder, an oven and a rotary kiln arranged in sequence along the process sequence. The pickling mechanism consists of a pickling tank.

[0007] Preferably, the grinding module includes a jaw crusher B and a classifying ball mill arranged in sequence along the process sequence.

[0008] Preferably, it also includes a screening module arranged in the front process of the iron removal module, The screening module is used to initially remove large iron mineral particles from the black talc ore. The screening module comprises a jaw crusher A, a vibrating screen and a sorting device which are arranged in sequence along the process sequence.

[0009] Preferably, the iron removal module is connected to the screening module process through a dry iron removal line. The dry iron removal line is used to remove magnetic iron minerals from black talc ore.

[0010] Preferably, the sorting equipment consists of two conveyor lines, one of which is used for manual sorting operations and the other is equipped with an optical identifier.

[0011] Preferably, the pickling mechanism consists of a wet ball mill.

[0012] Preferably, the method for removing iron from black talc is characterized by comprising the following steps: Step 1: pre-treating the black talc ore to preliminarily remove large particles of iron minerals and magnetic iron minerals, and obtain black talc material; Step 2: The black talc material is crushed for the second time by a cone crusher, and then ball-milled to 325 mesh by a dry ball mill to obtain black talc powder; Step 3: Take one part of black talcum powder and put it into the pickling tank, add two parts of water into the pickling tank, stir evenly in the pickling tank, and then add oxalic acid accounting for 10% of the weight of black talcum powder to remove iron, and react for 12 hours; Step 4: After the reaction, the slurry is filtered through a filter press, and the mud cake obtained after the filtration is made into a brick through a screw extruder. The brick is dried in an oven and then sent to a rotary kiln for high-temperature sintering at 1200°C for 6 hours; Step 5: After the sintered bricks are cooled, they are crushed by jaw crusher B and ball-milled by graded ball mill to obtain talcum powder products; Step 6: Use the detection module to test the whiteness of the talcum powder product and set the whiteness standard to 90.

[0013] Preferably, the step 1 comprises the following steps: S1: The black talc ore is crushed by jaw crusher A to reduce its particle size. The crushed black talc ore enters the vibrating screen for classification treatment to separate minerals of different particle sizes; S2: Large-sized black talc ore enters the manual sorting conveyor line, where workers select black talc and impurity minerals based on their appearance characteristics, such as color, gloss, and shape. Small-sized black talc enters the optical sorting conveyor line, where workers sort the minerals based on differences in optical properties such as color and gloss under light, combined with image recognition technology. S3: After the preliminary removal of some impurity minerals, the black talc material enters the dry iron removal line. Under the action of the strong magnetic field, the magnetic iron minerals will be adsorbed on the magnetic separation equipment, which can effectively remove the magnetic iron minerals.

[0014] Preferably, in step 2, the mixture is ball-milled to 100 meshes by a dry ball mill; In step three, one part of black talc powder is put into a wet ball mill, two parts of water are added into the wet ball mill, and then oxalic acid accounting for 10% of the mass of the black talc is added, and wet ball milling is performed for 6 hours to perform an iron removal reaction.

[0015] The beneficial effects of the present invention are: The technical solution of the present invention uses oxalic acid to replace traditional hydrochloric acid or sulfuric acid to remove iron from black talc. 1. Oxalic acid can react chemically with iron ions to form soluble complexes, which can be decomposed by microorganisms and sunlight, thereby effectively removing iron impurities from black talc, providing an environmentally friendly and effective method for iron removal from black talc; 2. The waste generated during the iron removal process with oxalic acid is relatively small and easy to handle. At the same time, the complex generated by the reaction of oxalic acid and iron is biodegradable and meets environmental protection requirements; 3. Oxalic acid can better maintain the physical and chemical properties and lattice structure of black talc during the iron removal process, reducing the adverse effects on its performance; 4. Although the price of oxalic acid may be slightly higher than that of sulfuric acid and hydrochloric acid, its advantages such as good iron removal effect, little impact on material properties, and good environmental protection make it more cost-effective in long-term applications. Compared with sulfuric acid and hydrochloric acid, which may produce harmful gases or acid mist during the iron removal process, causing pollution and corrosion to the environment and production equipment, reducing subsequent processing and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The process flow chart of the iron removal system based on black talc of the present invention is as follows; Figure 2 This is a process flow chart of Embodiment 1 of the present invention; Figure 3 This is a process flow chart of Embodiment 2 of the present invention; Description of reference numerals: 100. Iron removal module; 110, cone crusher; 120, dry ball mill; 130, pickling mechanism; 140, filter press; 150, screw extruder; 160, oven; 170, rotary kiln; 1310, pickling tank; 1320, wet ball mill; 200, grinding module; 210. Jaw crusher B; 220. Classifying ball mill; 300. Detection module; 400. Screening module; 410. Jaw crusher A; 420. Vibrating screen; 430. Sorting equipment; 500. Dry method of removing iron wire. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] See also Figure 1-3 The present invention provides a technical solution: a system and method for removing iron from black talc, comprising an iron removal module 100, a grinding module 200 and a detection module 300 arranged in sequence along the process sequence, wherein the iron removal module 100 is used to remove iron impurities in the black talc material, the grinding module 200 is used to grind the black talc material that has been treated with iron removal to achieve the required particle size requirements, and the detection module 300 is used to detect the ground black talc powder to detect whether its whiteness meets the standard. The iron removal module 100 comprises a cone crusher 110, a dry ball mill 120, a pickling mechanism 130, a filter press 140, a screw extruder 150, an oven 160 and a rotary kiln 170 arranged in sequence along the process sequence, and the pickling mechanism 130 is composed of a pickling tank 1310.

[0019] Based on the above-mentioned structural setting, the iron removal system based on black talc is composed of an iron removal module 100, a grinding module 200 and a detection module 300, wherein the iron removal module 100, the grinding module 200 and the detection module 300 are arranged in sequence along the process sequence, the iron removal module 100 is used to remove iron impurities in the black talc, the grinding module 200 is used to grind the black talc material that has been treated with iron removal to achieve the particle size requirements of the product, and the detection module 300 is used to detect the black talc powder after the grinding treatment to ensure that its quality meets the standards. Through the strict control of the detection module 300, the quality of the final product can be ensured to be stable and reliable. Specifically, the iron removal method based on black talc: Embodiment 1: The black talc is crushed and ball-milled to 325 mesh to obtain black talc powder. One part of the black talc powder is added with two parts of water, and stirred evenly in the pickling tank 1310. Then, oxalic acid accounting for 10% of the mass of the black talc is added to remove iron. After the reaction for 12 hours, the mud is filter-filtered. The mud cake obtained after the filter press is made into a brick by a screw extruder 150. After drying, it is sintered at 1200°C for 6 hours. After cooling, it is crushed and ball-milled to obtain talc powder with a whiteness of about 90.

[0020] Although the whiteness of the talc powder prepared by this method can reach 90%, the production cycle is long and the cost is high. If the 325-mesh black talc powder is changed to 100-mesh or the reaction time is changed to 6 hours, the whiteness of the talc powder after calcination cannot reach 90.

[0021] Embodiment 2: The black talc is crushed and ball-milled to 100 mesh to obtain black talc powder. One part of the black talc powder is put into a wet ball mill 1320. Two parts of water are added to the wet ball mill 1320. Then, oxalic acid accounting for 10% of the mass of the black talc is added. The wet ball mill is subjected to 6 hours of iron removal reaction. After the reaction, the mud is filter-filtered. The mud cake obtained after the filter pressing is made into a brick by a screw extruder 150. After drying, it is sintered at 1200°C for 6 hours. After cooling, it is crushed and ball-milled to obtain talc powder with a whiteness of about 90.

[0022] Embodiment 2 is a further optimization scheme based on embodiment 1. Compared with embodiment 1, the production cycle is short, the quality of the prepared talcum powder is stable, and the production cost is reduced.

[0023] It should be noted that the detection module 300 of the present application is not limited to one instrument and equipment, and can be any combination of multiple instruments and equipment, such as: The component analyzer is used to analyze the chemical composition of talcum powder, especially the content of key components such as silicon dioxide and magnesium oxide. The content of these components has a direct impact on the performance and use of talcum powder.

[0024] Whiteness meter is used to measure the whiteness value of talcum powder. The whiteness meter determines the whiteness of the sample by measuring its reflection and scattering properties of light.

[0025] Depending on the specific application requirements, other testing equipment may also be needed to evaluate the performance and quality of talc, such as density meter, hardness tester, specific surface area analyzer, etc.

[0026] Among them, the comparison of talcum powder detection before and after iron removal reaction by component analyzer is as follows: Element Before iron removal reaction After iron removal reaction Silicon dioxide 71.92% 71.85% Aluminum oxide 2.68% 2.86% Magnesium oxide 24.02% 24.12% Iron (III) oxide 0.72% 0.33% It can be clearly observed that the content of ferric oxide, an iron impurity in talc, is significantly reduced before and after the iron removal reaction.

[0027] The iron removal system and method based on black talc use oxalic acid to replace traditional hydrochloric acid or sulfuric acid for iron removal treatment of black talc. Oxalic acid can react chemically with iron ions to generate soluble complexes, which can be decomposed by microorganisms and sunlight, thereby effectively removing iron impurities from black talc, providing an environmentally friendly and effective method for iron removal from black talc. Oxalic acid generates relatively little waste in the iron removal process and is easy to handle. At the same time, the complex generated by the reaction of oxalic acid and iron element is biodegradable and meets environmental protection requirements. Oxalic acid can better maintain the physical and chemical properties and lattice structure of black talc in the iron removal process, reducing adverse effects on its performance. Although the price of oxalic acid may be slightly higher than that of sulfuric acid and hydrochloric acid, its advantages of good iron removal effect, small impact on material properties, and good environmental protection make it more cost-effective in long-term applications. Compared with sulfuric acid and hydrochloric acid, harmful gases or acid mist may be generated in the iron removal process, causing pollution and corrosion to the environment and production equipment, thereby reducing subsequent treatment and maintenance costs.

[0028] Furthermore, the grinding module 200 includes a jaw crusher B210 and a grading ball mill 220 arranged in sequence along the process sequence. Among them, the jaw crusher B210 is used to crush the sintered black talc brick material, with a simple structure and convenient maintenance, while the grading ball mill 220 is used to grind the black talc material after crushing, that is, a grading screen is added on the basis of the traditional drum ball mill, which can perform grinding and grading operations at the same time, thereby improving production efficiency and product quality.

[0029] Furthermore, it also includes a screening module 400 arranged in the front process of the iron removal module 100, and the screening module 400 is used to preliminarily remove large particles of iron minerals in the black talc ore. The screening module 400 includes a jaw crusher A410, a vibrating screen 420 and a sorting device 430 arranged in sequence along the process sequence. Among them, the screening module 400 is used to process the black talc ore. The jaw crusher A410 with low maintenance cost is used as the preliminary crushing equipment of the black talc ore, which can meet the production needs. Since the particle size distribution of the black talc ore after being crushed by the jaw crusher A410 is relatively wide, by configuring the vibrating screen 420 in the post-process, a black talc ore with a more uniform particle size can be obtained, which provides convenience for the subsequent sorting process.

[0030] Furthermore, the iron removal module 100 is connected to the screening module 400 through a dry iron removal line 500, and the dry iron removal line 500 is used to remove magnetic iron minerals in the black talc ore. Among them, by connecting a dry iron removal line 500 between the iron removal module 100 and the screening module 400, the magnetic iron minerals in the black talc ore can be initially separated by magnetic separation, which reduces the burden for subsequent processing and improves the iron removal efficiency.

[0031] Furthermore, the sorting equipment 430 is composed of two conveyor lines, one of which is used for manual sorting, and the other is equipped with an optical identifier. For impurity minerals with large particle size and easy to identify, manual sorting can be used for preliminary separation. The manual sorting method is simple and direct, but the efficiency is low and the workers' experience is required to be high. Therefore, only as a means of preliminary sorting, an optical identifier is configured on the other conveyor line. The optical sorting technology is applied to the sorting process of black talc minerals. The differences in optical properties such as color and gloss of minerals under light, combined with advanced image recognition technology, can achieve efficient and accurate sorting.

[0032] Furthermore, the pickling mechanism 130 is composed of a wet ball mill 1320. Preferably, the wet ball mill 1320 is used to replace the pickling tank 1310 as the pickling container, and ball milling is performed simultaneously during the pickling process, which can significantly improve the iron removal efficiency.

[0033] Furthermore, the method for removing iron from black talc is characterized by comprising the following steps: Step 1: pre-treating the black talc ore to preliminarily remove large particles of iron minerals and magnetic iron minerals, and obtain black talc material; Step 2: The black talc material is crushed for a second time by a cone crusher 110, and ball-milled to 325 mesh by a dry ball mill 120 to obtain black talc powder; Step 3: Take one part of black talcum powder and put it into the pickling tank 1310, add two parts of water into the pickling tank 1310, stir evenly in the pickling tank 1310, and then add oxalic acid accounting for 10% of the mass of black talcum powder to carry out iron removal reaction, and react for 12 hours; Step 4: After the reaction, the slurry is filtered through a filter press 140, and the mud cake obtained after the filtration is made into a brick through a screw extruder 150. The brick is dried in an oven 160 and then sent to a rotary kiln 170 for high-temperature sintering at 1200° C. for 6 hours; Step 5: After the sintered bricks are cooled, they are crushed by a jaw crusher B210 and ball-milled by a grading ball mill 220 to obtain talcum powder products; Step 6: Perform whiteness test on the talcum powder product through the detection module 300, and set the whiteness standard to 90.

[0034] Among them, the above are the detailed steps for implementing one of this application.

[0035] Furthermore, step one includes the following steps: S1: The black talc ore is crushed by the jaw crusher A410 to reduce its particle size. The crushed black talc ore enters the vibrating screen 420 for classification treatment to separate minerals of different particle sizes; S2: Large-sized black talc ore enters the manual sorting conveyor line, where workers select black talc and impurity minerals based on their appearance characteristics, such as color, gloss, and shape. Small-sized black talc enters the optical sorting conveyor line, where workers sort the minerals based on differences in optical properties such as color and gloss under light, combined with image recognition technology. S3: After the preliminary removal of some impurity minerals, the black talc material enters the dry iron removal line 500. Under the action of the strong magnetic field, the magnetic iron minerals will be adsorbed on the magnetic separation equipment, which can effectively remove the magnetic iron minerals.

[0036] Among them, the above are the detailed steps for pre-treatment of black talc ore.

[0037] Further, in step 2, the dry ball mill 120 is used to ball-mill the mixture to a size of 100 mesh; In step three, one part of black talc powder is put into a wet ball mill 1320, two parts of water are added into the wet ball mill 1320, and then oxalic acid accounting for 10% of the mass of the black talc is added, and wet ball milling is performed for 6 hours to perform an iron removal reaction.

[0038] Among them, the above is a detailed description of how Example 2 of the present application differs from Example 1. Specifically, in step 2, the black talc material is ball-milled in a dry ball mill 120 after secondary crushing by a cone crusher 110, and needs to pass through a 100-mesh sieve to obtain black talc powder with a smaller particle size; in step 3, a wet ball mill 1320 is used instead of the pickling tank 1310 as a reaction container to reduce the iron removal reaction time to 6 hours.

[0039] According to the disclosure and teaching of the above description, those skilled in the art to which the present invention belongs may also make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should also fall within the scope of protection of the claims of the present invention. In addition, although some specific terms are used in this specification, these terms are only for the convenience of description and do not constitute any limitation to the present invention.

Claims

1. A system for removing iron from black talc, comprising an iron removal module (100), a grinding module (200) and a detection module (300) arranged in sequence along the process sequence, wherein: The iron removal module (100) is used to remove iron impurities in the black talc material; The grinding module (200) is used to grind the black talc material that has been subjected to the iron removal treatment to achieve the required particle size requirement; The detection module (300) is used to detect the ground black talc powder to detect whether its whiteness meets the standard; The invention is characterized in that: the iron removal module (100) comprises a cone crusher (110), a dry ball mill (120), a pickling mechanism (130), a filter press (140), a screw extruder (150), an oven (160) and a rotary kiln (170) arranged in sequence along the process sequence; The pickling mechanism (130) is composed of a pickling tank (1310).

2. The iron removal system based on black talc according to claim 1, characterized in that: The grinding module (200) comprises a jaw crusher B (210) and a classifying ball mill (220) which are arranged in sequence along the process sequence.

3. The iron removal system based on black talc according to claim 1, characterized in that: It also includes a screening module (400) arranged in a preceding process of the iron removal module (100); The screening module (400) is used to preliminarily remove large particles of iron minerals from the black talc ore; The screening module (400) comprises a jaw crusher A (410), a vibrating screen (420) and a sorting device (430) which are arranged in sequence along the process sequence.

4. The iron removal system based on black talc according to claim 3, characterized in that: The iron removal module (100) is connected to the screening module (400) via a dry iron removal line (500); The dry iron removal line (500) is used to remove magnetic iron minerals from black talc ore.

5. The iron removal system based on black talc according to claim 3, characterized in that: The sorting equipment (430) consists of two conveyor lines, one of which is used for manual sorting operations, and the other conveyor line is equipped with an optical identifier.

6. The iron removal system based on black talc according to claim 1, characterized in that: The pickling mechanism (130) is composed of a wet ball mill (1320).

7. A method for removing iron from black talc, characterized in that: The steps include: Step 1: pre-treating the black talc ore to preliminarily remove large particles of iron minerals and magnetic iron minerals, and obtain black talc material; Step 2: The black talc material is crushed for a second time by a cone crusher (110), and ball-milled to 325 mesh by a dry ball mill (120) to obtain black talc powder; Step 3: Take one part of the mass of black talc powder and put it into the pickling tank (1310), add two parts of the mass of water into the pickling tank (1310), stir evenly in the pickling tank (1310), and then add oxalic acid accounting for 10% of the mass of the black talc to carry out iron removal reaction, and react for 12 hours; Step 4: After the reaction, the slurry is filtered through a filter press (140), and the mud cake obtained after the filtration is made into a brick through a screw extruder (150). The brick is dried in an oven (160) and then sent to a rotary kiln (170) for high-temperature sintering at 1200° C. for 6 hours; Step 5: After the sintered bricks are cooled, they are crushed by a jaw crusher B (210) and ball-milled by a grading ball mill (220) to obtain a talcum powder product; Step 6: Perform whiteness test on the talcum powder product through the detection module (300), and set the whiteness standard to 90.

8. The method for removing iron from black talc according to claim 7, characterized in that: The step 1 comprises the following steps: S1: The black talc ore is crushed by a jaw crusher A (410) to reduce its particle size. The crushed black talc ore enters a vibrating screen (420) for classification to separate minerals of different particle sizes; S2: Large-sized black talc ore enters the manual sorting conveyor line, where workers select black talc and impurity minerals based on their appearance characteristics, such as color, gloss, and shape. Small-sized black talc enters the optical sorting conveyor line, where workers sort the minerals based on differences in optical properties such as color and gloss under light, combined with image recognition technology. S3: After the preliminary removal of some impurity minerals, the black talc material enters the dry iron removal line (500). Under the action of the strong magnetic field, the magnetic iron minerals will be adsorbed on the magnetic separation equipment, which can effectively remove the magnetic iron minerals.

9. The method for removing iron from black talc according to claim 7, characterized in that: In step 2, the mixture is ball-milled to 100 meshes by a dry ball mill (120); In step 3, one part of black talc powder is put into a wet ball mill (1320), two parts of water are added into the wet ball mill (1320), and then oxalic acid accounting for 10% of the mass of the black talc is added, and wet ball milling is performed for 6 hours to perform an iron removal reaction.

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