High-efficiency comprehensive utilization mineral processing technology for talc ore solid waste

Abstract

The invention belongs to the technical field of talc ore beneficiation, and particularly relates to an efficient comprehensive utilization mineral processing technology for talc ore solid waste, which comprises an optical microscope, an X-ray diffraction analyzer, an intelligent ore sorting machine, a crusher, a sieve shaker, a vertical stirring mill and a flotation machine. And the talc concentrate is obtained through treatment of an intelligent ore sorting machine, a double-roll crusher, a vibration screening machine, a vertical stirring mill and a flotation machine in sequence. Compared with the prior art, the method has the beneficial effects that the high-grade talc concentrate is retreated, selected and recycled from the talc solid waste without utilization value, and reutilization of the talc ore solid waste is effectively improved; the production cost is reduced: the energy consumption is reduced and the production cost is reduced by optimizing the mineral separation process and parameters; the comprehensive utilization of the talc ore solid waste is realized, the environmental pollution caused by the stockpiling of the talc ore solid waste is reduced, and the environmental protection benefit is good.

Description

Technical Field

[0001] The invention belongs to the technical field of talc solid waste recovery and reuse, and in particular relates to a mineral processing technology for efficient comprehensive utilization of talc mine solid waste. Background Art

[0002] A large amount of talc solid waste will be generated during the mining and processing of talc. Talc solid waste has no application value and is stored, which has a great damage to the natural environment. The development of talc solid waste will become the focus, and flotation is an important means of enriching talc solid waste resources. These talc solid wastes still contain a certain amount of talc and magnesite, and recycling has economic value.

[0003] At present, the main beneficiation method is to further improve the grade of low-grade talc (the part with talc content from 35% to 55%) to obtain higher-grade talc concentrate. The purification methods include: flotation, hand selection, electrostatic selection, magnetic separation, photoelectric selection, selective crushing and screening (high-quality talc ore), etc. Photoelectric selection replaces hand selection to remove darker gangue minerals in talc ore; flotation, magnetic separation and electrostatic separation are used to remove associated minerals in talc. However, some talc ore solid wastes (talc content ≤ 35%) with no industrial utilization value have not been studied yet.

[0004] The Chinese utility model application number 201921338529.9 discloses a comprehensive recovery system for talc tailings, including a double-roll crusher, a ball mill, a strong magnetic separator, a fine screen, a roughing flotation machine, a fine flotation machine 1, a fine flotation machine 2, and a tower mill. A strong magnetic-fine screen process is used to recover iron minerals, and a two-stage grinding-flotation process is used to recover talc minerals. The talc minerals can fully realize monomer dissociation and avoid over-grinding, thereby ensuring both the recovery rate of the talc and the purity and whiteness of the talc.

[0005] The disadvantages of this solution are that it adopts a two-stage grinding-flotation process, the energy consumption of the mill is very large, the cost of the treatment process is too high, and the treatment effect of talc ore solid waste with a content of less than 35% is not mentioned. The flotation agent used cannot be naturally degraded and has poor environmental protection. In addition, the sodium ion content in the flotation agent exceeds the standard, which limits the application of the talc products produced. Summary of the invention

[0006] The purpose of the present invention is to provide a mineral processing technology for the efficient comprehensive utilization of talc ore solid waste, overcome the shortcomings of the prior art, adopt intelligent pre-selection equipment to recover the dolomite in the tailings, and then crush and grind the coarse concentrate with a double-roll crusher and a vertical ball mill in sequence to fully separate the talc from other minerals, and then further flotation separation is carried out through a flotation device to obtain talc concentrate, thereby improving resource utilization. The utilization efficiency of talc ore solid waste reaches more than 65%.

[0007] To achieve the above object, the present invention is implemented through the following technical solutions:

[0008] A mineral processing technology for efficient comprehensive utilization of talc solid waste, characterized in that it includes an optical microscope, an X-ray diffraction analyzer, an intelligent ore sorter, a crusher, a vibrating screen, a vertical stirred mill and a flotation machine; the talc solid waste is classified by the optical microscope and the X-ray diffraction analyzer, and is processed in sequence by the intelligent ore sorter, the double-roll crusher, the vibrating screen, the vertical stirred mill and the flotation machine to obtain M46A grade magnesite and talc solid waste; the flotation machine is a mineral processing technology composed of a first-stage roughing flotation machine, a three-stage scavenging flotation machine and a two-stage concentrating flotation machine.

[0009] Furthermore, the intelligent ore sorting machine is an artificial intelligence sorting machine or an X-ray intelligent sorting machine.

[0010] Furthermore, the crusher is any one of a double-roll crusher, an impact crusher, a jaw crusher, a cone crusher, and a hammer crusher.

[0011] Furthermore, the vibrating screen machine is any one of a linear vibrating screen, a circular vibrating screen, a rotary vibrating screen, a drum screen, a swing screen, an elliptical screen, a multi-element high-efficiency screen, a high-width screen, a relaxation screen, and a roller screen.

[0012] Furthermore, the vertical stirred mill is any one of a vertical zirconia ball mill, a vertical sand mill, and a vertical spiral stirred mill.

[0013] Furthermore, the specification model of the flotation machine is a Dafkeller (jet-compressed air) flotation machine.

[0014] Furthermore, by combining mineralogical analysis, intelligent sorting, crushing and screening, grinding and flotation, 35% by weight of M46A grade magnesite, 30% of talc concentrate with a talc content of ≥91.3% and 35% of talc tailings with a talc content of ≤5% were obtained, reducing the solid waste discharge of talc mines by more than 65%. The specific operation steps are as follows:

[0015] 1) Mineralogical analysis of the raw ore: Through experimental equipment, the structural analysis, main chemical composition analysis, mineral composition and relative content determination of the raw ore are carried out to obtain the embedding characteristics, particle size distribution characteristics and dissociation degree of important minerals, providing a basis for subsequent mineral processing;

[0016] 2) Intelligent pre-selection: using an intelligent ore sorter to classify talc solid waste to obtain M46A grade magnesite and talc solid waste;

[0017] 3) crushing and screening, crushing the talc solid waste selected in step 2) to obtain crushed talc solid waste under a 7 mm sieve;

[0018] 4) grinding, using a vertical stirred mill to process the crushed talc solid waste obtained in step 3) to obtain a talc solid waste slurry with a concentration of 50% and a 0.074 mm sieve-level of 65%;

[0019] 5) flotation, the talc ore solid waste slurry obtained in step 4) flows into a stirring tank, and 40g of sodium dodecyl sulfate / ton of ore is added for slurry adjustment; the slurry after slurry adjustment enters a roughing flotation machine for talc roughing to obtain a talc rough concentrate; 20g of sodium dodecyl sulfate / ton of ore is continuously added to a scavenging flotation machine for scavenging to obtain talc scavenging middlings and tailings, the talc scavenging middlings are returned to the roughing for reselection, and the talc rough concentrate is subjected to two-stage fine flotation to obtain a talc concentrate and a concentrated middling, the talc concentrate is the final product, and the concentrated middlings and the scavenging middlings are returned to the previous flotation operation in sequence.

[0020] Furthermore, the talc content in the talc ore solid waste is less than 35%; the indicators of the obtained magnesite M46A grade are: MgO ≥ 46%, CaO ≤ 0.6%, SiO2 ≤ 0.6%; the indicators of the obtained talc concentrate are: whiteness 92, acid-soluble iron content ≤ 0.5%, talc pure grade ≥ 91.3%, CaO content ≤ 1%.

[0021] Furthermore, in the step 5), sodium dodecyl sulfate is used as a collector and frother in the roughing process, and the dosage is 40 g / ton of raw ore; sodium dodecyl sulfate is used as a collector and frother in the scavenging process, and the dosage is 20 g / ton of raw ore; and no reagent is added in the concentration stage.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1) Improved resource utilization: The present invention can reprocess the original talc ore solid waste with a talc content of ≤35% to recover two concentrate products: (1) magnesite M46A grade: MgO ≥46%, CaO ≤0.6%, SiO2 ≤0.6%; (2) talc concentrate: a high-grade talc concentrate with a whiteness of 92, an acid-soluble iron content of ≤0.5%, a talc purity of ≥91.3%, and a CaO content of ≤1%;

[0024] 2) Cost reduction: By optimizing the flotation process and parameters, energy consumption is reduced and production costs are reduced;

[0025] 3) Significant environmental benefits: The present invention adopts a degradable flotation agent, sodium dodecyl sulfate is an environmentally friendly foaming agent used in shampoo, and the amount used in the present invention is only one-fiftieth of the amount used in shampoo, achieving a comprehensive utilization rate of talc solid waste of more than 65%, while reducing the pollution of the environment caused by the tailings storage, and having good environmental benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a process flow chart of an embodiment of the present invention;

[0027] Figure 2 This is a flotation process flow chart of an embodiment of the present invention;

[0028] Figure 3 is the X-ray diffraction pattern of the raw ore in the embodiment of the present invention; DETAILED DESCRIPTION

[0029] The technical solution of the present invention will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0030] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the specific embodiments required to be used in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the specific embodiments described below are some implementation methods of the present invention. For ordinary technicians in this field, other specific embodiments can be obtained based on these specific embodiments without paying creative work.

[0031] The components of the embodiments of the present invention generally described and shown in the specific embodiments herein can be arranged and designed in countless different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the specific embodiments is not intended to limit the scope of the invention claimed, but only represents selected embodiments of the present invention.

[0032] The following examples are based on the Chengxiang Mine No. 1 of Liaoning Xinda Talc Group Co., Ltd., and the tailings after two water separations are the original ore.

[0033] See Figure 1 , is a process flow chart of an embodiment of a mineral processing process for efficient comprehensive utilization of talc ore solid waste of the present invention, including an optical microscope, an X-ray diffraction analyzer, an intelligent ore sorter, a crusher, a vibrating screen, a vertical stirring mill and a flotation machine. The talc tailings are classified by an optical microscope and an X-ray diffraction analyzer, and are processed in sequence by an intelligent ore sorter, a crusher, a vibrating screen, a vertical stirring mill and a flotation machine to obtain M46A grade magnesite and talc ore solid waste; the flotation machine is a mineral processing process composed of a first-stage roughing flotation machine, a three-stage scavenging flotation machine and a two-stage concentrating flotation machine.

[0034] In the embodiment, the intelligent ore sorter is any one of an artificial intelligence sorter or an X-ray intelligent sorter, preferably an artificial intelligence sorter. The crusher is any one of a double-roll crusher, an impact crusher, a jaw crusher, a cone crusher, and a heavy hammer crusher, preferably a double-roll crusher. The vibrating screen is any one of a linear vibrating screen, a circular vibrating screen, a rotary vibrating screen, a drum screen, a swing screen, an elliptical screen, a multi-element high-efficiency screen, a high-width screen, a relaxation screen, and a roller screen, preferably a linear vibrating screen. The vertical stirred mill is any one of a vertical zirconia ball mill, a vertical sand mill, and a vertical spiral stirred mill, preferably a vertical zirconia ball mill. The specification model of the flotation machine is a Dafkoller (jet-compressed air) flotation machine. The flotation machine group consisting of six flotation machines is distributed according to the process route. Figure 2 .

[0035] The invention discloses a high-efficiency comprehensive utilization and treatment process of talc tailings, by combining mineralogical analysis, intelligent sorting, crushing and screening, grinding and flotation, to obtain 35% by weight of M46A grade magnesite, 30% of talc concentrate with a talc grade of ≥91.3% and 35% of talc tailings with a talc content of ≤5%, thereby reducing the discharge of talc ore solid waste by more than 65%, and obtaining (1) M46A grade magnesite with a composition of MgO ≥46%, CaO ≤0.6% and SiO2 ≤0.6%; (2) talc concentrate with a whiteness of 92, an acid-soluble iron content of ≤0.5%, a talc pure grade of ≥91.3% and a CaO content of ≤1%. The specific operation steps are as follows:

[0036] 1) Mineralogical analysis of the raw ore: The structural analysis, main chemical composition analysis, mineral composition and relative content determination of talc ore solid waste with talc content less than 35% were carried out by experimental equipment to obtain the embedding characteristics, particle size distribution characteristics and dissociation degree of important minerals, which provided a basis for subsequent mineral processing. The mineral composition and relative content of talc ore solid waste are shown in Table 1.

[0037] Table 1

[0038] Mineral Name Relative content, % Mineral Name Relative content, % talc 2503 Pyrrhotite 0.34 Magnesite 5568 apatite 031 dolomite 1473 magnetite 021 quartz 321 other 049

[0039] See Figure 3 The diffraction results of the original ore show that the main mineral in the original ore is magnesite, followed by talc and dolomite, with a small amount of quartz, magnetite, pyrrhotite and apatite, as well as trace amounts of chalcopyrite, feldspar, amphibole and serpentine.

[0040] 2) Intelligent pre-selection: using an intelligent ore sorter to classify talc solid waste, M46A grade magnesite and talc solid waste accounting for 35% by weight are obtained. By continuously optimizing the sorting parameters, the pre-selection effect is ensured and the subsequent mineral processing efficiency is improved; the pre-selection results of the test example are shown in Table 2;

[0041] Table 2

[0042]

[0043] 35% M46A grade magnesite concentrate can be selected through intelligent pre-selection, and the indicators of the obtained M46A grade magnesite are: MgO ≥ 46%, CaO ≤ 0.6%, SiO2 ≤ 0.6%.

[0044] 3) Crushing and screening: crushing the talc solid waste selected in step 2) to obtain crushed talc solid waste under 7 mm sieve; the crushing and screening step can be continuously cycled for 2 times until the grade of the crushed ore is stable. See Table 3.

[0045] Table 3

[0046]

[0047] 4) Grinding: Use a vertical stirred mill to process the crushed talc solid waste obtained in step 3) to obtain a talc solid waste slurry with a concentration of 50% and a 0.074mm sieve accounting for 65%, to ensure the full dissociation of talc from other minerals. Taking a vertical zirconia ball mill with a volume of 2L as an example, the experiment uses a vertical grinding tank with a polyurethane lining. A total of three types of zirconia balls, large, medium and small, are used to form the grinding medium in a ratio of 2:3:1. Draw a grinding curve when the grinding concentration is 50%. The corresponding effects of grinding particle size and flotation effect are shown in Table 4.

[0048] Table 4

[0049]

[0050] As shown in Table 4, with the increase of -0.074mm content, the SiO2 grade in the concentrate remains basically unchanged, and the SiO2 recovery rate gradually increases; when the -0.074mm content is 50%, the SiO2 recovery rate is 77.68%. When the grinding fineness continues to increase to 60% of -0.074mm content, the SiO2 recovery rate increases by about 1 percentage point, while the CaO and Fe2O3 recovery rates increase by nearly 3 percentage points and about 1 percentage point respectively. Therefore, it is better to select the concentrate powder fineness as 60% of -0.074mm content.

[0051] 5) flotation, the talc ore solid waste slurry obtained in step 4) flows into a stirring tank, and 40g of sodium dodecyl sulfate / ton of ore is added for slurry adjustment; the slurry after slurry adjustment enters a roughing flotation machine for talc roughing to obtain a talc rough concentrate; 20g of sodium dodecyl sulfate / ton of ore is continuously added to a scavenging flotation machine for scavenging to obtain talc scavenging middlings and tailings, the talc scavenging middlings are returned to the roughing for re-selection, the talc rough concentrate is subjected to two fine flotations to obtain a talc concentrate and a selected middling, the talc concentrate is the final product, and the selected middlings and the scavenging middlings are returned to the previous flotation operation in sequence.

[0052] Sodium dodecyl sulfate is used as collector and frother in roughing, with the dosage of 40g / ton of raw ore; sodium dodecyl sulfate is used as collector and frother in scavenging, with the dosage of 20g / ton of raw ore; no reagent is added in the concentrating section.

[0053] The indicators of the final talc concentrate are: whiteness 92, acid-soluble iron content ≤0.5%, talc purity ≥91.3%, CaO content ≤1%. The data of talc concentrate, raw ore and tailings selected in the embodiment of the present invention are shown in Table 5.

[0054] Table 5

[0055]

[0056] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A mineral processing process for efficient comprehensive utilization of talc ore solid waste, characterized in that: The invention comprises an optical microscope, an X-ray diffraction analyzer, an intelligent ore sorter, a crusher, a vibrating screen, a vertical stirring mill and a flotation machine. The talc solid waste is classified by the optical microscope and the X-ray diffraction analyzer, and is processed in sequence by the intelligent ore sorter, the double-roll crusher, the vibrating screen, the vertical stirring mill and the flotation machine to obtain M46A grade magnesite and talc solid waste. The flotation machine is a mineral processing technology composed of a first-stage roughing flotation machine, a three-stage scavenging flotation machine and a two-stage concentrating flotation machine.

2. The mineral processing technology for efficient comprehensive utilization of talc mine solid waste according to claim 1, characterized in that: The intelligent ore sorting machine is an artificial intelligence sorting machine or an X-ray intelligent sorting machine.

3. The mineral processing technology for efficient comprehensive utilization of talc mine solid waste according to claim 1, characterized in that: The crusher is any one of a double-roll crusher, an impact crusher, a jaw crusher, a cone crusher, and a hammer crusher.

4. The mineral processing technology for efficient comprehensive utilization of talc mine solid waste according to claim 1, characterized in that: The vibrating screen machine is any one of a linear vibrating screen, a circular vibrating screen, a rotary vibrating screen, a drum screen, a swing screen, an elliptical screen, a multi-element high-efficiency screen, a high-width screen, a tension screen, and a roller screen.

5. The mineral processing technology for efficient comprehensive utilization of talc mine solid waste according to claim 1, characterized in that: The vertical stirred mill is any one of a vertical zirconia ball mill, a vertical sand mill, and a vertical spiral stirred mill.

6. The mineral processing technology for efficient comprehensive utilization of talc mine solid waste according to claim 1, characterized in that: The specification model of the flotation machine is a Dafkeller (jet-compressed air) type flotation machine.

7. The mineral processing technology for efficient comprehensive utilization of talc mine solid waste according to claim 1, characterized in that: Combining mineralogy analysis, intelligent sorting, crushing and screening, grinding and flotation, we can obtain 35% by weight of M46A grade magnesite, 30% of talc concentrate with a talc content of ≥91.3% and 35% of talc tailings with a talc content of ≤5%, reducing the solid waste discharge of talc mines by more than 65%. The specific operation steps are as follows: 1) Mineralogical analysis of the raw ore: Through experimental equipment, the structural analysis, main chemical composition analysis, mineral composition and relative content determination of the raw ore are carried out to obtain the embedding characteristics, particle size distribution characteristics and dissociation degree of important minerals, providing a basis for subsequent mineral processing; 2) Intelligent pre-selection: using an intelligent ore sorter to classify talc solid waste to obtain M46A grade magnesite and talc solid waste; 3) crushing and screening, crushing the talc solid waste selected in step 2) to obtain crushed talc solid waste under a 7 mm sieve; 4) grinding, using a vertical stirred mill to process the crushed talc solid waste obtained in step 3) to obtain a talc solid waste slurry with a concentration of 50% and a 0.074 mm sieve-level of 65%; 5) flotation, the talc ore solid waste slurry obtained in step 4) flows into a stirring tank, and 40g of sodium dodecyl sulfate / ton of ore is added for slurry adjustment; the slurry after slurry adjustment enters a roughing flotation machine for talc roughing to obtain a talc rough concentrate; 20g of sodium dodecyl sulfate / ton of ore is continuously added to a scavenging flotation machine for scavenging to obtain talc scavenging middlings and tailings, the talc scavenging middlings are returned to the roughing for reselection, and the talc rough concentrate is subjected to two-stage fine flotation to obtain a talc concentrate and a concentrated middling, the talc concentrate is the final product, and the concentrated middlings and the scavenging middlings are returned to the previous flotation operation in sequence.

8. The mineral processing technology for efficient comprehensive utilization of talc mine solid waste according to claim 7, characterized in that: The talc content in the talc ore solid waste is less than 35%; the indicators of the obtained magnesite M46A grade are: MgO≥46%, CaO≤0.6%, SiO2≤0.6%; the indicators of the obtained talc concentrate are: whiteness 92, acid-soluble iron content≤0.5%, talc pure grade≥91.3%, CaO content≤1%.

9. The mineral processing technology for efficient comprehensive utilization of talc mine solid waste according to claim 7, characterized in that: In the step 5), sodium dodecyl sulfate is used as a collector and frother in the roughing process, and the dosage is 40 g / ton of raw ore; sodium dodecyl sulfate is used as a collector and frother in the scavenging process, and the dosage is 20 g / ton of raw ore; and no reagent is added in the concentration stage.

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