Magnetic separation upgrading method for low-quality fluorite powder

Abstract

The invention relates to the technical field of purification, in particular to a low-quality fluorite powder magnetic separation upgrading method which comprises the following steps: pretreating fluorite ore to obtain fluorite powder, performing magnetic separation treatment on the fluorite powder by using a magnetic separator, removing magnetic impurities in the fluorite powder, obtaining magnetic separation stone powder, performing flotation purification on the magnetic separation stone powder, and removing non-magnetic impurities in the magnetic separation stone powder. According to the method, the magnetic separation technology and the solid-liquid separation technology are combined, magnetic impurities in the low-quality fluorite powder can be effectively removed through the magnetic separation technology, effective separation of the magnetic impurities such as pyrite in the low-quality fluorite powder is achieved, meanwhile, the flotation technology is combined, solid-liquid separation and further purification are achieved, and the high-purity fluorite powder is obtained. The quality of the fluorite powder is improved, and the problems that the fluorite powder subjected to quality improvement has magnetic associated ore powder and the quality improvement effect is poor in an existing quality improvement method for the low-quality fluorite powder are solved.

Description

Technical Field

[0001] The invention relates to the technical field of purification, and in particular to a method for magnetic separation and upgrading of low-quality fluorite powder. Background Art

[0002] Fluorite is one of my country's important strategic non-metallic minerals and is known as the "second rare earth". my country is rich in fluorite resources, but the average grade is low, and most of them are associated fluorite ores, which are difficult to sort and recycle. Fluorite minerals have low hardness and are brittle, and their hardness is quite different from that of silicate and other gangue minerals.

[0003] Fluorite powder is fluorite powder. Fluorite powder contains impurities and needs to be purified and improved. At present, the methods for improving the quality of fluorite powder are gravity separation and flotation. The flotation method is suitable for processing fluorite ores with finer embedded particles, and can obtain fluorite concentrate and powder with higher grade and quality. During the flotation process, it is necessary to select appropriate flotation agents and processes according to the different associated mineral compositions and impregnation characteristics of fluorite. The gravity separation method is suitable for the purification of coarse-grained embedded fluorite ores. In the process of fluorite ore purification, gravity separation is often used as auxiliary separation and pre-separation, which has the advantages of energy saving, high efficiency and environmental protection.

[0004] However, the fluorite powder improved by the above two methods cannot completely remove impurities therein and still contains a small amount of magnetic associated mineral powder (pyrite powder), and the quality improvement effect is poor. Summary of the invention

[0005] The purpose of the present invention is to provide a method for magnetic separation and upgrading of low-quality fluorite powder, aiming to solve the problem of the existing method for upgrading low-quality fluorite powder, that the upgraded fluorite powder has magnetic associated ore powder, and the quality improvement effect is poor.

[0006] To achieve the above object, the present invention provides a method for magnetic separation and upgrading of low-quality fluorite powder, comprising the following steps:

[0007] Pre-treating the fluorite ore to obtain fluorite powder;

[0008] Using a magnetic separator to perform magnetic separation on the fluorite powder to remove magnetic impurities therein, thereby obtaining magnetically separated stone powder;

[0009] The magnetic separation stone powder is subjected to flotation purification to remove non-magnetic impurities therein and obtain high-purity fluorite powder.

[0010] The specific method of pre-treating the fluorite ore to obtain fluorite powder is as follows:

[0011] The fluorite ore is crushed and ground to obtain abrasive and large-particle materials;

[0012] Screening the abrasive and the large-particle material, and performing secondary grinding on the large-particle material to obtain secondary abrasive;

[0013] The abrasive and the secondary abrasive are collected to obtain fluorite powder.

[0014] The specific method of using a magnetic separator to magnetically separate the fluorite powder to remove magnetic impurities therein to obtain magnetically separated stone powder is as follows:

[0015] Selecting a magnetic separator, setting magnetic separation parameters of the magnetic separator, and putting the fluorite powder into the magnetic separator;

[0016] The magnetic separator is started to perform magnetic separation treatment to separate magnetic impurities from the fluorite powder, remove the magnetic impurities therein, and obtain magnetically separated stone powder.

[0017] Wherein, the magnetic separator includes a wet magnetic separator, a dry magnetic separator and a high-intensity magnetic separator, and the magnetic separation parameters include magnetic field intensity and magnetic field gradient.

[0018] The specific method of flotation purification of the magnetic separation stone powder to remove non-magnetic impurities therein to obtain high-purity fluorite powder is as follows:

[0019] Selecting a flotation agent based on the associated mineral composition and impregnation characteristics of the fluorite powder;

[0020] The magnetic separation stone powder and the flotation reagent are sent into a flotation machine for flotation, and the flotation machine parameters are set;

[0021] The flotation machine is started to perform flotation to remove non-magnetic impurities therein and obtain high-purity fluorite powder.

[0022] Among them, the flotation machine parameters include the pH value and stirring intensity of the flotation reagent, the flotation reagent includes a fatty acid collector, an inhibitor and a pulp conditioner, the fatty acid collector includes oleic acid and oxidized paraffin soap, the inhibitor includes water glass, sodium hexametaphosphate and tannin, and the pulp conditioner is sodium carbonate.

[0023] Wherein, the step of starting the flotation machine to perform flotation to remove non-magnetic impurities therein and obtain high-purity fluorite powder further comprises:

[0024] The high-purity fluorite powder is put into a drying machine for drying and dehydration, and the dried high-purity fluorite powder is cooled to obtain a high-purity fluorite powder product.

[0025] The invention discloses a method for improving the quality of low-quality fluorite powder by magnetic separation. The method comprises the following steps: pre-treating fluorite ore to obtain fluorite powder, performing magnetic separation treatment on the fluorite powder by using a magnetic separator to remove magnetic impurities therein to obtain magnetically separated stone powder, and flotation-purifying the magnetically separated stone powder to remove non-magnetic impurities therein to obtain high-purity fluorite powder. The method combines magnetic separation technology with solid-liquid separation technology. The magnetic impurities in the low-quality fluorite powder can be effectively removed by the magnetic separation technology, and effective separation of magnetic impurities such as pyrite in the low-quality fluorite powder can be achieved. At the same time, the flotation technology is combined to achieve solid-liquid separation and further purification, thereby improving the quality of the fluorite powder. The method solves the problem that the existing method for improving the quality of low-quality fluorite powder has magnetic associated ore powder and the quality improvement effect is poor. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 This is a flow chart of a method for magnetic separation and upgrading of low-quality fluorite powder provided by the present invention.

[0028] Figure 2 It is a flow chart of a specific method of pre-treating fluorite ore to obtain fluorite powder.

[0029] Figure 3 The present invention is a flowchart of a specific method of using a magnetic separator to perform magnetic separation on the fluorite powder to remove magnetic impurities therein and obtain magnetically separated stone powder.

[0030] Figure 4 It is a flow chart of a specific method for flotation purification of the magnetic separation stone powder to remove non-magnetic impurities therein to obtain high-purity fluorite powder. DETAILED DESCRIPTION

[0031] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0032] See also Figures 1 to 4 The present invention provides a method for magnetic separation and upgrading of low-quality fluorite powder, comprising the following steps:

[0033] S1 pre-treats the fluorite ore to obtain fluorite powder;

[0034] Specific method:

[0035] S11 crushes and grinds the fluorite ore to obtain abrasive and large-particle materials;

[0036] In the embodiment of the present invention, a jaw crusher is used to perform preliminary crushing on the fluorite ore to crush the fluorite ore to a certain particle size, and then a cone crusher or an impact crusher is used for secondary crushing to further reduce the particle size of the ore.

[0037] S12: screening the abrasive and the large-particle material, and performing secondary grinding on the large-particle material to obtain secondary abrasive;

[0038] In the embodiment of the present invention, the crushed large-particle material is sent to a ball mill for grinding to achieve a suitable magnetic separation particle size, which is convenient for the subsequent magnetic separation operation of a magnetic separator.

[0039] S13 collects the abrasive and the secondary abrasive to obtain fluorite powder.

[0040] S2 uses a magnetic separator to perform magnetic separation on the fluorite powder to remove magnetic impurities therein to obtain magnetically separated stone powder;

[0041] In an embodiment of the present invention, suitable magnetic separator models and equipment are selected, such as a wet magnetic separator, a dry magnetic separator, a high-intensity magnetic separator, etc., and the selection is made according to the magnetic impurity content and particle size of the fluorite powder. The pretreated fluorite powder is fed into the magnetic separator, and the magnetic impurities are separated from the fluorite powder through the action of the magnetic field.

[0042] Specific method:

[0043] S21 selects a magnetic separator, sets magnetic separation parameters of the magnetic separator, and puts the fluorite powder into the magnetic separator;

[0044] In an embodiment of the present invention, the magnetic separator includes a wet magnetic separator, a dry magnetic separator and a high-intensity magnetic separator, and the magnetic separation parameters include magnetic field intensity and magnetic field gradient.

[0045] S22 starts the magnetic separator to perform magnetic separation treatment, separates the magnetic impurities from the fluorite powder, removes the magnetic impurities therein, and obtains magnetically separated stone powder.

[0046] In an embodiment of the present invention, the attraction of the magnetic field to magnetic minerals is utilized to separate magnetic impurities such as pyrite from fluorite powder. The magnetic impurities in low-quality fluorite powder can be effectively removed by magnetic separation technology, thereby achieving effective separation of magnetic impurities such as pyrite in low-quality fluorite powder. At the same time, the removed magnetic impurities such as pyrite can be recycled to save resources.

[0047] S3 is to flotation purify the magnetic stone powder to remove non-magnetic impurities therein to obtain high-purity fluorite powder, put the high-purity fluorite powder into a dryer for drying and dehydration, and cool the dried high-purity fluorite powder to obtain a high-purity fluorite powder product.

[0048] In an embodiment of the present invention, the high-purity fluorite powder is dehydrated by drying the high-purity fluorite powder. The concentrate after flotation can also be dehydrated using dehydration equipment such as a thickener, a filter or a centrifuge. By selecting appropriate dehydration equipment and optimizing operating parameters, the solid content of the concentrate can be increased and the moisture content can be reduced.

[0049] Specific method:

[0050] S31, selecting a flotation agent based on the associated mineral composition and impregnation characteristics of the fluorite powder;

[0051] In an embodiment of the present invention, the flotation reagent includes a fatty acid collector, an inhibitor and a pulp conditioner, the fatty acid collector includes oleic acid and oxidized paraffin soap, the inhibitor includes water glass, sodium hexametaphosphate and tannin, and the pulp conditioner is sodium carbonate.

[0052] S32: sending the magnetic separation stone powder and the flotation reagent into a flotation machine for flotation, and setting the flotation machine parameters;

[0053] In the embodiment of the present invention, the flotation machine parameters include pH value and stirring intensity of the flotation reagent.

[0054] S33 starts the flotation machine to perform flotation to remove non-magnetic impurities and obtain high-purity fluorite powder.

[0055] This method combines magnetic separation technology and solid-liquid separation technology. The magnetic separation technology can effectively remove magnetic impurities in low-quality fluorite powder, and effectively separate magnetic impurities such as pyrite in low-quality fluorite powder. At the same time, combined with flotation technology, solid-liquid separation and further purification are achieved to improve the quality of fluorite powder. This solves the problem of existing low-quality fluorite powder quality improvement methods, in which the upgraded fluorite powder has magnetic associated ore powder and quality improvement effect.

[0056] The above disclosure is only a preferred embodiment of the method for magnetic separation and upgrading of low-quality fluorite powder of the present invention. Of course, it cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiments and equivalent changes made according to the claims of the present invention are still within the scope of the invention.

Claims

1. A method for magnetic separation and upgrading of low-quality fluorite powder, characterized in that: The following steps are involved: Pre-treating the fluorite ore to obtain fluorite powder; Using a magnetic separator to perform magnetic separation on the fluorite powder to remove magnetic impurities therein, thereby obtaining magnetically separated stone powder; The magnetic separation stone powder is subjected to flotation purification to remove non-magnetic impurities therein and obtain high-purity fluorite powder.

2. The method for magnetic separation and upgrading of low-quality fluorite powder according to claim 1, characterized in that: The specific method of pre-treating the fluorite ore to obtain fluorite powder is as follows: The fluorite ore is crushed and ground to obtain abrasive and large-particle materials; Screening the abrasive and the large-particle material, and performing secondary grinding on the large-particle material to obtain secondary abrasive; The abrasive and the secondary abrasive are collected to obtain fluorite powder.

3. The method for magnetic separation and upgrading of low-quality fluorite powder according to claim 1, characterized in that: The specific method of using a magnetic separator to magnetically separate the fluorite powder to remove magnetic impurities therein to obtain magnetically separated stone powder is as follows: Selecting a magnetic separator, setting magnetic separation parameters of the magnetic separator, and putting the fluorite powder into the magnetic separator; The magnetic separator is started to perform magnetic separation treatment to separate magnetic impurities from the fluorite powder, remove the magnetic impurities therein, and obtain magnetically separated stone powder.

4. The method for magnetic separation and upgrading of low-quality fluorite powder according to claim 3, characterized in that: The magnetic separator includes a wet magnetic separator, a dry magnetic separator and a high-intensity magnetic separator, and the magnetic separation parameters include magnetic field intensity and magnetic field gradient.

5. The method for magnetic separation and upgrading of low-quality fluorite powder according to claim 1, characterized in that: The specific method of flotation purification of the magnetic separation stone powder to remove non-magnetic impurities therein to obtain high-purity fluorite powder is: Selecting a flotation agent based on the associated mineral composition and impregnation characteristics of the fluorite powder; The magnetic separation stone powder and the flotation reagent are sent into a flotation machine for flotation, and the flotation machine parameters are set; The flotation machine is started to perform flotation to remove non-magnetic impurities therein and obtain high-purity fluorite powder.

6. The method for magnetic separation and upgrading of low-quality fluorite powder according to claim 5, characterized in that: The flotation machine parameters include the pH value and stirring intensity of the flotation reagents. The flotation reagents include fatty acid collectors, inhibitors and pulp conditioners. The fatty acid collectors include oleic acid and oxidized paraffin soap. The inhibitors include water glass, sodium hexametaphosphate and tannin. The pulp conditioner is sodium carbonate.

7. The method for magnetic separation and upgrading of low-quality fluorite powder as claimed in claim 5, It is characterized by: The method of starting the flotation machine to perform flotation to remove non-magnetic impurities therein and obtain high-purity fluorite powder further comprises: The high-purity fluorite powder is put into a drying machine for drying and dehydration, and the dried high-purity fluorite powder is cooled to obtain a high-purity fluorite powder product.

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