Beneficiation and purification method of black talc and product thereof

Abstract

The application provides a beneficiation purification method of black talc and a product thereof, and relates to the technical field of mineral processing engineering. The method comprises the following steps: 1) crushing the black talc ore by a crusher to obtain crushed ore powder; 2) placing the ore powder in step 1) in a screening machine to separate fine particles and coarse particle ores; 3) placing the fine particles obtained in step 2) in a high-speed dispersion machine, adding water and a dispersing agent to stir and disperse, and obtaining ore slurry; 4) placing the ore slurry obtained in step 3) in a screening machine or a hydrocyclone to screen or classify, collecting undersize or overflow, and drying to obtain black talc fine powder. The method provided by the application can purify the black talc ore, and obtain black talc concentrate with a talc mineral content of more than 90%, and has the advantages of simple beneficiation process, low energy consumption, high efficiency, large processing capacity and environmental protection without pollution. The application can realize resource utilization of the black talc ore with low talc content, and significantly improve the economic benefit.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of mineral processing engineering, and particularly relates to a beneficiation and purification method of black talc and a product thereof. BACKGROUND

[0002] The layered structure of talc determines its excellent properties, and talc can be widely applied to people's daily life and industrial production, especially in ceramics, papermaking, cosmetics, plastics, rubber and food and drug processing. The talc resource reserves in China rank first in the world, but in recent years, the talc output in China gradually decreases, and the output of real high-grade talc cannot meet the domestic demand. The market demand for talc changes from low-quality talc to high-quality talc, and the talc processing industry is in a tense period. The basic and high-end utilization of talc mineral resources has great economic value, and improving the utilization rate and utilization level not only improves the economic benefit but also saves global resources and improves the environment and mineral benefit. It is of great significance for the Chinese talc processing industry to improve the talc processing industrial technology and produce high-quality talc products meeting the current market demand. Black talc, as a mineral resource with huge reserves, has a broad industrial application prospect due to its relatively simple mineral composition.

[0003] The natural whiteness of the black talc produced in Guangfeng District, Shangrao City, Jiangxi Province is low, and the main blackening factor is that it contains a certain amount of carbon. The mature processing method at present is to remove carbon by calcination, so that the whiteness reaches the industrial use requirement, but in the calcination process, talc undergoes phase transition and is converted into enstatite, which can only be applied to the field of ceramics. Another method is to directly grind to obtain low-grade talc powder for use as a filler. The black talc in Guangfeng District contains impurity minerals such as quartz and dolomite in addition to black color, and the talc content is generally between 25% and 75%, and a few can reach 85%. Therefore, the mineral purity is also one of the key factors restricting its application.

[0004] In summary, it is necessary to solve the technical problem of developing the application of black talc by removing the impurity minerals such as quartz and dolomite in the black talc through beneficiation and purification. SUMMARY

[0005] The purpose of the present application is to provide a beneficiation and purification method of black talc, which can purify the black talc ore with a talc content of 25-75% to a talc content of more than 90% through a low-energy-consumption, simple and easy-to-operate processing technology, so as to improve the utilization value and economic benefit of the black talc ore.

[0006] To achieve the above purpose, the present application provides a beneficiation and purification method of black talc, which specifically comprises the following steps:

[0007] 1) crushing the black talc ore with a crusher to obtain crushed ore powder;

[0008] 2) put the ore powder in step 1) into a screening machine to separate fine particles and coarse ore particles;

[0009] 3) put the fine particles obtained in step 2) into a high-speed dispersion machine, add water and a dispersing agent to stir and disperse to obtain an ore slurry;

[0010] 4) put the ore slurry obtained in step 3) into a screening machine or a hydrocyclone to screen or classify, collect the undersize or overflow, and dry to obtain black talc fine powder.

[0011] In a preferred embodiment, in step 1), the crusher is an eccentric crusher or a hammer crusher or a roller mill, and the discharge particle size is 1-10 mm.

[0012] In a preferred embodiment, in step 2), the screen used in the screening machine is 10-80 mesh, and the undersize collected is fine particles, and the oversize is coarse ore particles.

[0013] In a preferred embodiment, in step 3), the dispersing agent is one or more of sodium hexametaphosphate, sodium polyacrylate, triethanolamine or ethylene glycol.

[0014] In a preferred embodiment, in step 3), the mass ratio of the dispersing agent to the ore powder is (0.1-2.5):100.

[0015] In a preferred embodiment, in step 3), the mass percentage concentration of the ore powder in the ore slurry is 30-75%.

[0016] In a preferred embodiment, in step 3), the stirring and dispersing speed is 100-1500 rpm, and the stirring time is 0.1-4 h.

[0017] In a preferred embodiment, in step 4), the screen used in the screening machine is 100-500 mesh.

[0018] In a preferred embodiment, in step 4), the hydrocyclone has a diameter of Φ10-100 mm and a pressure of 0.1-0.4 Mpa.

[0019] Another object of the present application is to provide black talc fine powder obtained by purifying black talc raw ore obtained by any of the above methods. According to the method of the present application, the talc content in black talc raw ore can be increased to more than 90%, and the purification effect is remarkable.

[0020] Compared with the prior art, the technical scheme of the present application has the following advantages:

[0021] 1. In the present application, the impurity minerals (quartz, dolomite, etc.) in the black talc raw ore are innovatively purified by physical methods under the same treatment conditions as talc, taking advantage of the difference in particle size, which has the advantages of environmental protection, low energy consumption and easy industrialization.

[0022] 2. The beneficiation method of the present application has a simple process flow, and the black talc is purified by selective crushing, which has high yield, low production cost and is safe and pollution-free. BRIEF DESCRIPTION OF DRAWINGS

[0023] These and / or other aspects and advantages of the present application will become more apparent and more readily appreciated from the following detailed description of the embodiments of the present application, taken in conjunction with the accompanying drawings in which:

[0024] Figure 1 The XRD pattern of the black talc raw ore in Example 1 of the present application.

[0025] Figure 2 The XRD pattern of the black talc concentrate obtained after purification in Example 1 of the present application. DETAILED DESCRIPTION

[0026] In order for those skilled in the art to better understand the present application, the present application will be further described in detail below in conjunction with specific embodiments, but it should be understood that the scope of protection of the present application is not limited by the specific embodiments.

[0027] The beneficiation and purification method of black talc and its product provided by the present application solve the problem of high impurity content and low talc content in the black talc ore produced in Guangfeng District, Shangrao City, Jiangxi Province in the prior art, which makes it difficult to fully utilize and causes resource waste.

[0028] The technical solution in the present application is to solve the above problems, and the general idea is as follows:

[0029] The present application provides a beneficiation and purification method for black talc, which specifically comprises the following steps:

[0030] 1) The black talc raw ore is crushed by a crusher to obtain crushed ore powder;

[0031] 2) The ore powder in step 1) is placed in a screening machine to separate fine particles and coarse particle ores;

[0032] 3) The fine particles obtained in step 2) are placed in a high-speed dispersing machine, water and a dispersing agent are added for stirring and dispersing to obtain a slurry;

[0033] 4) The slurry obtained in step 3) is placed in a screening machine or a hydrocyclone for screening or classification, and the undersize or overflow is collected and dried to obtain black talc concentrate.

[0034] In a preferred embodiment, in step 1), the crusher is an impact crusher or a hammer crusher or a roller mill, and the output particle size is 1-10 mm, preferably the hammer crusher, and the output particle size is 2-4 mm. In this step, the large-sized ore raw material is first broken into smaller particles, which facilitates the subsequent separation of impurities.

[0035] In a preferred embodiment, in step 2), the screen mesh used in the screening machine is 10-80 mesh, and the undersize collected is fine particles, and the oversize is coarse particle ore.

[0036] In a preferred embodiment, the coarse particle ore obtained in step 2) is repeatedly subjected to steps 1) and 2) until all fine particles are separated, thereby fully utilizing the black talc ore.

[0037] In a preferred embodiment, in step 3), the dispersing agent is one or more of sodium hexametaphosphate, sodium polyacrylate, triethanolamine or ethylene glycol.

[0038] In a preferred embodiment, in step 3), the mass ratio of the dispersing agent to the ore powder is (0.1-2.5):100, preferably, the mass ratio of the dispersing agent to the ore powder is (0.2-1):100.

[0039] In a preferred embodiment, in step 3), the mass percentage of the ore powder in the ore slurry is 30-75%, preferably, the mass percentage of the ore powder in the ore slurry is 35-60%.

[0040] In a preferred embodiment, in step 3), the stirring speed is 100-1500 rpm, and the stirring time is 0.1-4 h, preferably, the stirring speed is 500-800 rpm, and the stirring time is 0.5-1.5 h.

[0041] In this step, the fine particles are directly separated from the broken ore powder, water is added to obtain an ore slurry, and the dispersing agent is added to fully separate the ore powder particles of different sizes under high-speed stirring, thereby achieving physical separation and purification.

[0042] In a preferred embodiment, in step 4), the screen mesh used in the screening machine is 100-500 mesh, preferably, the screen mesh used in the screening machine is 325-400 mesh.

[0043] In a preferred embodiment, in step 4), the diameter of the hydrocyclone is Φ10-100 mm, and the pressure is 0.1-0.4 Mpa, preferably, the diameter of the hydrocyclone is Φ25-50 mm, and the pressure is 0.2-0.3 Mpa.

[0044] In a preferred embodiment, in step 4), the drying can be performed by any means known to those skilled in the art to remove water from the ore slurry, preferably by drying at 60-150°C for 2-4h.

[0045] Another object of the present application is to provide a purified black talc powder obtained by purifying the black talc ore obtained by any of the above methods. The content of talc in the black talc ore can be increased to more than 90% by the method of the present application, and the purification effect is remarkable.

[0046] The technical solutions of the present application will be described in detail below through specific examples:

[0047] If not specifically indicated, the technical means used in the present application are conventional means known to those skilled in the art, and various raw materials, reagents, instruments and equipment used in the present application can be purchased from the market or can be prepared by existing methods. The reagents used in the present application are analytical pure unless otherwise specified.

[0048] Example 1

[0049] The present embodiment provides a method for purifying black talc, comprising the following steps:

[0050] 1) The black talc ore (talc content 55%, dolomite content 16%, quartz content 28%, carbon content 1%) is crushed by a hammer crusher, and the discharge particle size is 10mm, to obtain crushed ore;

[0051] 2) The ore in step 1) is placed in a screening machine, and a 10-mesh screen is used to separate fine particles below 10 mesh and coarse particle ore above 10 mesh;

[0052] 3) The fine particles below 10 mesh in step 2) are placed in a high-speed dispersing machine, water is added for slurry preparation, and 2.5% sodium hexametaphosphate dispersant by mass of the ore powder is added for strong stirring and dispersion. The specific stirring and dispersion process is that the ore slurry concentration is 30%, the stirring time is 0.1h, and the high-speed dispersing machine speed is 1500rpm;

[0053] The coarse particle ore obtained in step 2) is repeated with steps 1) and 2) until all fine particles are obtained;

[0054] 4) The ore slurry treated in step 3) is placed in a screening machine, and a 100-mesh screen is used for screening. The undersize fraction is filtered and dried to obtain black talc powder (talc content 90.5%, dolomite content 3%, quartz content 4%, carbon content 2.5%).

[0055] Example 2

[0056] The embodiment provides a method for purifying black talc, and comprises the following steps:

[0057] 1) black talc (talc content is 65%, dolomite content is 16%, quartz content is 18%, and carbon content is 1%) is crushed by a hammer crusher, the particle size of the discharged material is 5 mm, and crushed ore is obtained;

[0058] 2) the ore in step 1) is placed in a screening machine, a 40-mesh screen is used, fine particles below 40 mesh and coarse particle ore above 40 mesh are sorted out, and the coarse ore is returned to step 1) for continuous treatment;

[0059] 3) the fine particles below 40 mesh in step 2) are placed in a high-speed dispersion machine, water is added for slurry adjustment, 1.0% of sodium polyacrylate dispersant of the mass of the ore powder is added, and strong stirring and dispersion are performed, the specific stirring and dispersion process is that the pulp concentration is 70%, the stirring time is 4 h, and the rotation speed of the high-speed dispersion machine is 500 rpm;

[0060] The coarse particle ore obtained in step 2) is repeated to steps 1) and 2) until all fine particles are obtained;

[0061] 4) the ore slurry treated in step 3) is placed in a screening machine, a 400-mesh screen is used for screening, and the filtered and dried undersize part is black talc fine powder (talc content is 94%, dolomite content is 2%, quartz content is 3%, and carbon content is 1%).

[0062] Embodiment 3

[0063] The embodiment provides a method for purifying black talc, and comprises the following steps:

[0064] 1) black talc (talc content is 70%, dolomite content is 12%, quartz content is 14%, and carbon content is 4%) is crushed by a hammer crusher, the particle size of the discharged material is 3 mm, and crushed ore is obtained;

[0065] 2) the ore in step 1) is placed in a screening machine, an 80-mesh screen is used, fine particles below 80 mesh and coarse particle ore above 80 mesh are sorted out, and the coarse ore is returned to step 1) for continuous treatment;

[0066] 3) the fine particles below 80 mesh in step 2) are placed in a high-speed dispersion machine, water is added for slurry adjustment, 0.5% of triethanolamine dispersant of the mass of the ore powder is added, and strong stirring and dispersion are performed, the specific stirring and dispersion process is that the pulp concentration is 50%, the stirring time is 2 h, and the rotation speed of the high-speed dispersion machine is 800 rpm;

[0067] The coarse particle ore obtained in step 2) is repeated to steps 1) and 2) until all fine particles are obtained;

[0068] 4) The slurry treated in step 3) is placed in a hydrocyclone with a diameter of Φ25mm and a pressure of 0.2Mpa. The overflow is filtered and dried to obtain black talc powder (96% talc, 1.5% dolomite, 1% quartz, 1.5% carbon).

[0069] The foregoing description of specific exemplary embodiments of the application has been presented for the purposes of illustration and description. It is not intended to be exhaustive or to limit the application to the precise forms disclosed, and obviously many modifications and variations are possible in light of the above teaching. It is intended that the scope of the application be limited not with this detailed description, but rather by the claims appended hereto.

Claims

1. A method for beneficiation and purification of black mica, characterized by, The method comprises the following steps: 1) crushing the black talc raw ore by a crusher to obtain crushed ore powder; 2) placing the ore powder in step 1) in a screening machine to separate fine particles and coarse particle ore; 3) placing the fine particles obtained in step 2) in a high-speed dispersion machine, adding water and a dispersing agent for stirring and dispersion to obtain ore slurry; 4) placing the ore slurry obtained in step 3) in a screening machine or a hydrocyclone for screening or grading, collecting the undersize or overflow, and drying to obtain black talc fine powder; In step 1), the crusher is a jaw crusher or a hammer crusher or a pair of roller mills, and the discharge particle size is 2-4 mm; In step 2), the screen used in the screening machine has a mesh size of 10-80 mesh, and the undersize collected is fine particles, and the oversize is coarse particle ore; In step 3), the dispersing agent is one or more of sodium hexametaphosphate, sodium polyacrylate, triethanolamine or ethylene glycol; In step 3), the mass percentage concentration of the ore powder in the ore slurry is 35-60%; In step 3), the stirring and dispersion speed is 500-800 rpm, and the stirring time is 0.5-1.5 h; In step 4), the screen used in the screening machine has a mesh size of 100-500 mesh; In step 4), the hydrocyclone has a diameter of Φ10-100 mm and a pressure of 0.1-0.4 Mpa.

2. The method for beneficiation and purification of black talc according to claim 1, characterized in that, In step 3), the mass ratio of the dispersing agent to the ore powder is (0.1-2.5):

100.

3. The black talc product obtained according to the process of any one of claims 1-2, characterized in that, The prepared black talc fine powder has a talc content of more than 90%.

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