Iron removal system and method based on black mica

Abstract

The application discloses an iron removing system and method based on black mica, which comprises an iron removing module, a grinding module and a detection module. The iron removing module is used for removing iron impurities in black mica materials. The grinding module is used for grinding the black mica materials treated by the iron removing process to meet the required particle size requirement. The detection module is used for detecting the black mica powder treated by the grinding process. The iron removing module comprises a cone crusher, a dry ball mill, an acid pickling mechanism, a filter press, a screw extruder and an oven and a rotary kiln arranged in sequence along the process sequence. The acid pickling mechanism is composed of an acid pickling tank. The application relates to the technical field of mineral processing. The iron removing system and method based on black mica can effectively remove iron impurities from black mica by using oxalic acid for the iron removing treatment of black mica. The oxalic acid can react with iron ions to generate soluble complex, thereby providing an environment-friendly and effective method for the iron removing of black mica.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mineral processing, in particular to an iron removal system and method based on black talc. BACKGROUND

[0002] Iron is one of the two common impurity elements in black talc, and the content of iron impurities will directly affect the whiteness of black talc and its products. 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, so as to meet the high standard requirements of these industries on raw materials. In addition, the existence 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 meet the production needs of downstream industries. Therefore, iron removal treatment is an indispensable step in the processing of black talc.

[0003] In the process of realizing the present application, the inventors found that at least the following problems exist in the prior art:

[0004] Acid pickling iron removal is a common iron removal process in the talc industry. Most of the existing iron removal processes choose hydrochloric acid or sulfuric acid as the acid compound that reacts with iron. However, in actual application, if there is any residual hydrochloric acid in black talc after using hydrochloric acid for iron removal, a large amount of acid mist will be generated during the sintering process, which will cause great damage to the kiln and other equipment, and the corrosion of other equipment during the production process is also very serious, and the pollution problem is difficult to solve. If sulfuric acid is used for iron removal of black talc, as long as there is any residual sulfuric acid in the black talc, sulfur dioxide gas will be generated during the sintering process, which will pollute the atmosphere and not meet the environmental protection requirements.

[0005] Therefore, the above technical problems need to be solved. SUMMARY

[0006] In order to overcome the shortcomings of the prior art, the present application proposes an iron removal system and method based on black talc, which solves the problem that both hydrochloric acid and sulfuric acid as acid compounds exist after iron removal in the existing iron removal process. The residual hydrochloric acid will generate acid mist to damage the kiln and other equipment, and the residual sulfuric acid will generate sulfur dioxide to pollute the atmosphere, which cannot meet the requirements of environmental protection and production safety.

[0007] In order to solve the above technical problems, the basic technical scheme of the present application is as follows:

[0008] The iron removal system and method based on black talc comprises an iron removal module, a grinding module and a detection module arranged in sequence along the process sequence, wherein,

[0009] The iron removal module is used to remove iron impurities in black talc material,

[0010] The grinding module is used for grinding the black talc material after the iron removal treatment to meet the required particle size requirement.

[0011] The detection module is used for detecting the black talc powder after the grinding treatment to detect whether the whiteness meets the standard.

[0012] The iron removal module comprises, in sequence along the process order, a cone crusher, a dry ball mill, an acid pickling mechanism, a filter press, a screw extruder, an oven and a rotary kiln.

[0013] The acid pickling mechanism is composed of an acid pickling tank.

[0014] Preferably, the grinding module comprises, in sequence along the process order, a jaw crusher B and a classification ball mill.

[0015] Preferably, the screening module is arranged in the front process of the iron removal module.

[0016] The screening module is used for preliminarily removing the iron minerals of large particles in the black talc material.

[0017] The screening module comprises, in sequence along the process order, a jaw crusher A, a vibrating screen and a sorting device.

[0018] Preferably, the iron removal module is connected with the screening module in process through a dry iron removal line.

[0019] The dry iron removal line is used for removing the magnetic iron minerals in the black talc material.

[0020] Preferably, the sorting device is composed of two conveying lines, one of which is used for manual sorting operation, and the other of which is provided with an optical identifier.

[0021] Preferably, the acid pickling mechanism is composed of a wet ball mill.

[0022] Preferably, the iron removal method based on the black talc comprises the following steps.

[0023] Step 1: The black talc ore is pretreated to preliminarily remove the large-particle iron minerals and the magnetic iron minerals, and the black talc material is obtained.

[0024] Step 2: The black talc material is secondarily crushed by a cone crusher, and is ball milled to 325 mesh by a dry ball mill to obtain black talc powder.

[0025] Step 3: A certain mass of the black talc powder is put into an acid pickling tank, two masses of water are added into the acid pickling tank, and 10% of oxalic acid based on the mass of the black talc is added for iron removal reaction after uniform stirring in the acid pickling tank, and the reaction is carried out for 12 hours.

[0026] Step four: After reaction, the mud is filtered by a filter press, and the mud cake obtained after filtration is formed into a brick by a screw extruder, and the brick is dried in an oven and then sent into a rotary kiln for high-temperature sintering at 1200 DEG C for 6 hours;

[0027] Step five: After sintering, the brick is cooled and then crushed by a jaw crusher B and ball milled by a classification ball mill to obtain talc powder products;

[0028] Step six: The whiteness of the talc powder products is detected by a detection module, and the whiteness standard is set to 90.

[0029] Preferably, the step one comprises the following steps:

[0030] S1: The black talc ore is crushed by a jaw crusher A to make the particle size smaller, and the crushed black talc ore is classified by a vibrating screen to separate different particle size minerals;

[0031] S2: The large particle size black talc ore is sent to a hand sorting conveying line, and the hand sorting workers pick according to the appearance characteristics such as color, luster and shape of the black talc and impurity minerals, and the small particle size black talc is sent to an optical sorting conveying line, and the optical characteristics such as color and luster of the minerals under light are used to sort in combination with image recognition technology;

[0032] S3: The black talc material after initial removal of part of the impurity minerals is sent to a dry iron removal line, and under the action of a strong magnetic field, the magnetic iron minerals are adsorbed on the magnetic separation equipment, so that the magnetic iron minerals can be effectively removed.

[0033] Preferably, in step two, dry ball milling is performed to 100 mesh;

[0034] In step three, a mass of black talc powder is put into a wet ball mill, two masses of water are added to the wet ball mill, and 10% of the mass of the black talc is added as oxalic acid, and the wet ball milling is performed for 6 hours for iron removal reaction.

[0035] The beneficial effects of the present application are:

[0036] The technical scheme of the present application uses oxalic acid to replace traditional hydrochloric acid or sulfuric acid for iron removal treatment of black talc,

[0037] 1. Oxalic acid can react with iron ions to form a soluble complex, and the complex can be decomposed under the action of microorganisms and sunlight, so that the iron impurities in the black talc are effectively removed, providing an environmentally friendly and effective method for iron removal of black talc;

[0038] 2. The waste generated in the oxalic acid iron removal process is relatively small and easy to handle, and the complex generated by the reaction of oxalic acid and iron elements is biodegradable and meets the environmental protection requirements;

[0039] 3. Oxalic acid can better maintain the physical and chemical properties and lattice structure of black talc in the iron removal process, reducing the adverse effects on its performance;

[0040] 4. Although the price of oxalic acid may be slightly higher than that of sulfuric acid and hydrochloric acid, its good iron removal effect, small influence on material properties, and good environmental protection make it have higher cost-effectiveness in long-term application. Compared with sulfuric acid and hydrochloric acid, which may produce harmful gases or acid mist in the iron removal process, causing pollution and corrosion to the environment and production equipment, and reducing subsequent processing and maintenance costs. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 Process flow chart of the iron removal system based on black talc of the present application;

[0042] Figure 2 Process flow chart of Example 1 of the present application;

[0043] Figure 3 Process flow chart of Example 2 of the present application;

[0044] BRIEF DESCRIPTION OF DRAWINGS:

[0045] 100, iron removal module;

[0046] 110, cone crusher; 120, dry ball mill; 130, pickling mechanism; 140, filter press; 150, screw extruder; 160, oven; 170, rotary kiln;

[0047] 1310, pickling tank; 1320, wet ball mill;

[0048] 200, grinding module;

[0049] 210, jaw crusher B; 220, classification ball mill;

[0050] 300, detection module;

[0051] 400, screening module;

[0052] 410, jaw crusher A; 420, vibrating screen; 430, sorting equipment;

[0053] 500, dry iron removal line. DETAILED DESCRIPTION

[0054] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0055] Please refer to Figures 1-3 The present application provides a technical solution: an iron removal system and method based on black talc, which comprises an iron removal module 100, a grinding module 200 and a detection module 300 arranged in sequence along the process sequence. The iron removal module 100 is used to remove iron impurities in black talc material. The grinding module 200 is used to grind the black talc material after iron removal treatment to meet the required particle size requirement. The detection module 300 is used to detect the black talc powder after grinding treatment to detect whether the whiteness meets the standard. The iron removal module 100 comprises a cone crusher 110, a dry ball mill 120, an acid 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 acid pickling mechanism 130 is composed of an acid pickling tank 1310.

[0056] Based on the above structure, 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 arranged in sequence along the process sequence. The iron removal module 100 is used to remove iron impurities in black talc. The grinding module 200 is used to grind the black talc material after iron removal treatment to meet the required particle size requirement. The detection module 300 is used to detect the black talc powder after grinding treatment to ensure that the quality meets the standard. 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 is as follows:

[0057] Embodiment one:

[0058] The black talc is crushed and ball milled to 325 mesh to obtain black talc powder. A portion of the black talc powder is taken, two portions of water are added, and after stirring uniformly in the acid pickling tank 1310, 10% of the black talc by mass of oxalic acid is added for iron removal reaction. After 12 hours of reaction, the slurry is filter pressed. The mud cake obtained after filter pressing is made into a brick billet by a screw extruder 150, dried, and then sintered at a high temperature of 1200℃ for 6 hours. After cooling, the black talc powder with a whiteness of about 90 can be obtained by crushing and ball milling.

[0059] The whiteness of the talc powder prepared by the method can reach 90, but 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 6h, the whiteness of the calcined talc powder cannot reach 90.

[0060] Example two:

[0061] The black talc is crushed and ball milled to 100 mesh to obtain black talc powder. A mass of black talc powder is placed in a wet ball mill 1320, two masses of water are added to the wet ball mill 1320, and 10% of the mass of the black talc is added as oxalic acid. The iron removal reaction is carried out by wet ball milling for 6h. After the reaction, the slurry is pressure filtered. The mud cake obtained after pressure filtration is made into a brick billet by a screw extruder 150. After drying, high temperature sintering at 1200℃ for 6h is carried out. After cooling, the talc powder with a whiteness of about 90 can be obtained by crushing and ball milling.

[0062] Example two is a further optimized scheme based on example one. Compared with example one, the production cycle is short, the quality of the prepared talc powder is stable, and the production cost is reduced.

[0063] It should be noted that the detection module 300 of the present application is not limited to one instrument device, but can be any combination of multiple instrument devices. Specifically, for example:

[0064] The component analyzer is used to analyze the chemical components in the talc 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 talc powder.

[0065] The whiteness meter is used to measure the whiteness value of the talc powder. The whiteness meter determines the whiteness of the sample by measuring its light reflection and scattering properties.

[0066] According to the specific application requirements, other detection devices such as density meter, hardness meter, and specific surface area analyzer may also be used to evaluate the performance and quality of the talc powder.

[0067] The component analyzer is used to analyze the chemical components in the talc 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 talc powder.

[0068] Ingredients Before iron removal reaction After iron removal reaction Silicon dioxide 71.92% 71.85% Aluminium trioxide 2.68% 2.86% Magnesium oxide 24.02% 24.12% Iron trioxide 0.72% 0.33%

[0069] It can be clearly observed that the content of iron impurities, i.e. ferric oxide, in the talc powder before and after the iron removal reaction is significantly reduced.

[0070] The iron removal system and method based on black talc, by using oxalic acid to replace traditional hydrochloric acid or sulfuric acid for iron removal treatment of black talc, oxalic acid can react with iron ions to generate soluble complex, and the complex can be decomposed under the action of microorganisms and sunlight, thereby effectively removing iron impurities from black talc, providing an environmentally friendly and effective method for iron removal of black talc. The waste generated during the iron removal process is relatively small and easy to handle. At the same time, the complex generated by the reaction of oxalic acid and iron elements is biodegradable, meeting environmental protection requirements. Oxalic acid can better maintain the physical and chemical properties and crystal lattice structure of black talc during the iron removal process, reducing the adverse effects on its performance. Although the price of oxalic acid may be slightly higher than that of sulfuric acid and hydrochloric acid, its iron removal effect is good, it has little effect on material properties, and it is environmentally friendly, making it have higher cost-effectiveness in long-term application. 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.

[0071] Further, the grinding module 200 includes a jaw crusher B210 and a classification ball mill 220 arranged in sequence along the process sequence. The jaw crusher B210 is used for crushing the sintered black talc brick material, and the structure is simple and convenient to maintain. The classification ball mill 220 is used for grinding the crushed black talc material, that is, a classification screen is added to the traditional drum-type ball mill, which can simultaneously perform fine grinding and classification operations, improving production efficiency and product quality.

[0072] Further, the screening module 400 is arranged in the pre-process of the iron removal module 100. The screening module 400 is used to preliminarily remove large-particle iron minerals in the black talc ore. The screening module 400 includes a jaw crusher A410, a vibrating screen 420, and a separation device 430 arranged in sequence along the process sequence. 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 device for the black talc ore, which can meet the production requirements. Since the particle size distribution of the black talc ore crushed by the jaw crusher A410 is wide, the vibrating screen 420 is arranged in the subsequent process to obtain black talc ore with more uniform particle size, which facilitates the subsequent separation process.

[0073] Further, the iron removal module 100 is connected to the screening module 400 through a dry iron removal line 500. The dry iron removal line 500 is used to remove magnetic iron minerals in the black talc ore. 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 preliminarily separated by magnetic separation, which reduces the burden of subsequent processing and improves the iron removal efficiency.

[0074] Further, the sorting device 430 is composed of two conveying lines, one of which is used for manual sorting operation, and the other of which is provided with an optical identifier. For the impurity minerals with large particle size and easy to identify, the manual sorting method can be used for preliminary separation. The manual sorting method is simple and direct, but the efficiency is low, and the experience requirement of workers is high. Therefore, the optical sorting technology is applied to the sorting process of black talc minerals, and the optical sorting technology can realize efficient and accurate sorting by using the color and luster of minerals under light and combining with advanced image recognition technology.

[0075] Further, the pickling mechanism 130 is composed of a wet ball mill 1320. As an optimization, the wet ball mill 1320 is used instead of the pickling tank 1310 as a pickling container. The ball milling is performed synchronously during the pickling process, which can significantly improve the iron removal efficiency.

[0076] Further, the iron removal method based on black talc includes the following steps:

[0077] Step one: The black talc ore is pretreated to preliminarily remove large particle iron minerals and magnetic iron minerals, and black talc material is obtained.

[0078] Step two: The black talc material is subjected to secondary crushing by a cone crusher 110, and is ball milled to 325 mesh by a dry ball mill 120, to obtain black talc powder.

[0079] Step three: A certain amount of black talc powder is put into a pickling tank 1310, two times the amount of water is added to the pickling tank 1310, and after stirring uniformly in the pickling tank 1310, 10% of the mass of the black talc is added as oxalic acid for iron removal reaction, and the reaction is carried out for 12 hours.

[0080] Step four: After the reaction, the mud is filtered by a filter press 140, and the mud cake obtained after the filtration is made into a brick billet by a screw extruder 150. The brick billet is dried in an oven 160 and then sent to a rotary kiln 170 for high temperature sintering at 1200°C for 6 hours.

[0081] Step five: After the sintering, the brick billet is cooled and then crushed by a jaw crusher B210 and ball milled by a classification ball mill 220 to obtain talc powder products.

[0082] Step six: The whiteness of the talc powder products is detected by a detection module 300, and the whiteness standard is set to 90.

[0083] The above is the detailed steps of the first embodiment of the application.

[0084] Further, step one includes the following steps:

[0085] S1: the black talc raw ore is crushed by a jaw crusher A410 to make the particle size smaller, and the crushed black talc ore is classified by a vibrating screen 420 to separate the minerals of different particle sizes;

[0086] S2: the black talc ore of large particle size enters a hand sorting conveying line, and a hand sorting worker selects the black talc according to the appearance characteristics such as color, luster and shape of the black talc and impurity minerals; the black talc of small particle size enters an optical sorting conveying line, and the optical sorting is performed by using the differences in optical properties such as color and luster of the minerals under light and combining with image recognition technology;

[0087] S3: the black talc material after the initial removal of part of the impurity minerals enters a dry iron removal line 500, and under the action of a strong magnetic field, the magnetic iron minerals are adsorbed on a magnetic separation device, so that the magnetic iron minerals can be effectively removed.

[0088] The above is a detailed step of pretreatment of the black talc raw ore.

[0089] Further, in step two, the black talc is ball milled to 100 mesh by a dry ball mill 120;

[0090] In step three, a mass of black talc powder is put into a wet ball mill 1320, two masses of water are added to the wet ball mill 1320, 10% of the mass of the black talc is added as oxalic acid, and the wet ball milling is performed for 6 hours to perform the iron removal reaction.

[0091] The above is a detailed description of the second embodiment of the present application, which is different from the first embodiment. Specifically, in step two, the black talc material is ball milled by a dry ball mill 120 after being crushed by a cone crusher 110 for the second time, and needs to pass through a 100 mesh sieve to obtain black talc powder with smaller particle size; in step three, a wet ball mill 1320 is used to replace an acid washing tank 1310 as a reaction container, and the iron removal reaction time is reduced to 6 hours.

[0092] According to the disclosure and teaching of the above description, those skilled in the art in the field of the present application can also make changes and modifications to the above embodiments. Therefore, the present application is not limited to the specific embodiments disclosed and described above, and some modifications and changes of the present application should also fall within the protection scope of the claims of the present application. In addition, although some specific terms are used in the present specification, these terms are only used for convenience of description and do not constitute any limitation on the present application.

Claims

1. A system for removing iron from black slate, comprising an iron removal module (100), a grinding module (200) and a detection module (300) arranged in sequence, wherein the iron removal module (100) is used to remove iron impurities from black slate material; the grinding module (200) is used to grind the black slate material after iron removal treatment to meet the required particle size requirement; the detection module (300) is used to detect the whiteness of the ground black slate powder to determine whether it meets the standard; the iron removal module (100) comprises a cone crusher (110), a dry ball mill (120), an acid pickling mechanism (130), a filter press (140), a screw extruder (150), an oven (160) and a rotary kiln (170) arranged in sequence; the acid pickling mechanism (130) comprises an acid pickling tank (1310) to which oxalic acid is added, or the acid pickling mechanism (130) comprises a wet ball mill (1320) to which oxalic acid is added; the grinding module (200) comprises a jaw crusher B (210) and a classification ball mill (220) arranged in sequence; further comprising a screening module (400) arranged in the pre-process of the iron removal module (100); the screening module (400) is used to preliminarily remove large particle iron minerals from black slate material; the screening module (400) comprises a jaw crusher A (410), a vibrating screen (420) and a sorting device (430) arranged in sequence; the iron removal module (100) is connected to the screening module (400) through a dry iron removal line (500); the dry iron removal line (500) is used to remove magnetic iron minerals from black slate material; the sorting device (430) comprises two conveying lines, one of which is used for manual sorting, and the other of which is provided with an optical identifier; comprising the following steps: step one: pretreating the black slate ore to preliminarily remove large particle iron minerals and magnetic iron minerals, and obtaining black slate material; step two: secondary crushing the black slate material by a cone crusher (110) and ball milling to 325 mesh by a dry ball mill (120) to obtain black slate powder; step three: taking a mass of black slate powder into an acid pickling tank (1310), adding two masses of water into the acid pickling tank (1310), stirring uniformly in the acid pickling tank (1310), then adding 10% oxalic acid based on the mass of black slate for iron removal reaction, reacting for 12 hours, or taking a mass of black slate powder into a wet ball mill (1320), adding two masses of water into the wet ball mill (1320), then adding 10% oxalic acid based on the mass of black slate, wet ball milling for 6 hours for iron removal reaction; step four: after the reaction, filtering the mud by a filter press (140), and then making the mud cake into a brick by a screw extruder (150), drying the brick in an oven (160) and then sintering at 1200℃ for 6 hours in a rotary kiln (170). ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2. A method for removing iron from black mica based on the system for removing iron from black mica according to claim 1, characterized in that: ​ ​ ​ ​ ​ Step five: after the sintered brick cooling, it is crushed by jaw crusher B (210) and ball milled by classification ball mill (220) to obtain talc powder product; Step six: the whiteness of the talc powder product is detected by the detection module (300), and the whiteness standard is set to 90.

3. The method for removing iron from black-talek based on claim 2, characterized by: The step one comprises the following steps: S1: the black talc ore is crushed by jaw crusher A (410) to make the particle size smaller, and the crushed black talc ore is classified by the vibrating screen (420) to separate the minerals with different particle sizes; S2: the black talc ore with large particle size enters the hand sorting conveying line, the hand sorting workers pick according to the appearance characteristics of the black talc and impurity minerals, and the black talc with small particle size enters the optical sorting conveying line, and the optical sorting is carried out by using the color and luster optical characteristics of the minerals under light and combining the image recognition technology; S3: the black talc material after the initial removal of part of the impurity minerals enters the dry iron removal line (500), and under the action of the strong magnetic field, the magnetic iron minerals are adsorbed on the magnetic separation equipment, so that the magnetic iron minerals can be effectively removed.

4. The iron removal method based on the black talc according to claim 3, characterized in that: In step two, the dry ball mill (120) is used for ball milling to 100 mesh.

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