A beneficiation method for beneficiating 50 titanium concentrate using titanium middlings

Abstract

The application discloses a beneficiation method for beneficiating 50 titanium concentrate by using titanium middlings, which comprises the following steps: (1) removing iron from the titanium middlings by weak magnetic separation; (2) performing two-stage or more-stage strong magnetic separation on the iron-removed mineral, and returning the middlings generated in the strong magnetic separation process to the front-stage strong magnetic separation for cyclic beneficiation; obtaining magnetic separation concentrate, magnetic separation middlings and tailings; (3) performing acid washing treatment on the magnetic separation concentrate to obtain titanium concentrate with a titanium dioxide grade of 50% or more. The method adopts a multi-stage strong magnetic separation enrichment + acid washing process, and the whole beneficiation process does not need to use a flotation process, thereby avoiding the use of a large amount of titanium collecting reagent for flotation, reducing environmental pollution sources, and achieving the purposes of simple beneficiation process, effectively reduced production cost, and realizing stable and continuous production of low-calcium and low-magnesium 50 titanium concentrate.

Description

Technical Field

[0001] This invention relates to a mineral processing method, and more particularly to a mineral processing method for separating 50% titanium concentrate using titanium middlings. Background Technology

[0002] The 50% titanium concentrate refers to titanium concentrate with a titanium dioxide grade of ≥50%. This 50% titanium concentrate is an important industrial raw material, and its applications and prospects are closely linked to the overall development of China's titanium industry, presenting a complex situation of both opportunities and challenges. Titanium concentrate is the source of the titanium industry chain. Domestically, the main high-grade titanium concentrates have a titanium dioxide grade of ≥45%, and this product is mainly used in titanium dioxide production. Due to the sluggish real estate industry, this sector has been significantly affected. Titanium materials used in aerospace, chemical, and biomedical fields have even higher requirements for titanium concentrate. Not only does it need a higher titanium dioxide grade, but elements such as calcium and magnesium also need to be reduced. Domestically, there are few high-grade titanium concentrates that meet these requirements, and high-end titanium products are highly dependent on imported high-grade natural rutile. Existing beneficiation methods for high-grade titanium concentrate suffer from problems such as complex processes, high beneficiation costs, environmental pollution, low titanium concentrate recovery rates, and difficulty in guaranteeing the quality of the obtained high-grade titanium concentrate. Against this backdrop, stable and efficient production of 50 titanium concentrate can promote the efficient development of the country's titanium industry. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a stable and efficient mineral processing method for separating 50 titanium concentrate from titanium middlings.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention includes the following steps: (1) removing iron from titanium ore raw materials by weak magnetic separation; (2) Perform two or more strong magnetic separations on the iron-removed minerals, and return the middlings generated during the strong magnetic separation process to the previous strong magnetic separation for recycling separation; to obtain magnetic concentrate, magnetic middlings and tailings; (3) The magnetic separation concentrate is subjected to acid washing to obtain titanium concentrate with a titanium dioxide grade of ≥50%.

[0005] Furthermore, in step (1), the titanium grade of the titanium ore raw material is 29wt% to 33wt%.

[0006] Furthermore, in step (1), the iron content in the mineral after iron removal is ≤1wt%.

[0007] Furthermore, in step (2), a two-stage strong magnetic separation is employed.

[0008] Furthermore, during the first stage of strong magnetic separation, the frequency of the first roller of the magnetic separator is adjusted to 30-40 Hz, and the frequency of the second roller is 40-50 Hz; the titanium grade of the concentrate from the first stage of strong magnetic separation is ≥42 wt%.

[0009] Furthermore, during the second-stage high-intensity magnetic separation, the frequency of the first roller of the magnetic separator is adjusted to 35-45 Hz, and the frequency of the second roller is adjusted to 45-50 Hz; the titanium grade of the concentrate from the second-stage high-intensity magnetic separation is ≥49.5 wt%.

[0010] Furthermore, in step (3), concentrated hydrochloric acid is used to acid wash the magnetic concentrate.

[0011] Furthermore, the process includes the following steps: mixing the titanium middlings from the first stage of strong magnetic separation with the titanium tailings from the subsequent stage of strong magnetic separation and then performing strong magnetic separation again to obtain secondary titanium concentrate.

[0012] Furthermore, when performing strong magnetic separation again, the surface field strength of the magnetic separator is 7000-8000 GS, and the magnetic roller frequency is 40-50 Hz.

[0013] The beneficial effects of adopting the above technical solution are as follows: The present invention adopts a multi-stage strong magnetic separation enrichment + acid washing process, and the entire mineral beneficiation process does not require the use of flotation process, avoiding the use of a large amount of titanium collectors in flotation, reducing environmental pollution sources, the mineral beneficiation process is simple, effectively reducing production costs, and the various indicators of the high-grade titanium concentrate obtained can meet the high requirements of deep processing, realizing the goal of stable and continuous production of low-calcium and low-magnesium 50 titanium concentrate. Attached Figure Description

[0014] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0015] Figure 1 This is a schematic diagram of the process flow of the present invention. Detailed Implementation

[0016] Figure 1 As shown, the beneficiation method for separating 50 titanium concentrate using titanium middlings includes the following steps: (1) Titanium middlings with a titanium grade of 29wt% to 33wt% are used as raw materials. The titanium middlings raw materials are dried to a moisture content of ≤0.5wt%. The dried materials are then graded and ground according to the particle state of the raw materials so that the mineral fineness is ≤200 mesh and the mineral content reaches 20% to 30%, thereby improving the degree of liberation between useful minerals and gangue. This lays the foundation for improving the comprehensive metal recovery rate and the titanium grade of the beneficiated ore in subsequent beneficiation, and effectively reduces the cost of mineral beneficiation.

[0017] (2) Use a magnetic separator to perform weak magnetic separation to remove iron from titanium ore raw materials, ensuring that the content of strong magnetic minerals in the mineral after iron removal, i.e. the iron grade MFe, is ≤1wt%, and the removed strong magnetic minerals are used as iron concentrate; the magnetic field strength of the weak magnetic separation for iron removal is 2500~3000GS, preferably 3000GS.

[0018] (3) The minerals after iron removal are subjected to two or more stages of dry strong magnetic separation, and the middlings generated during the strong magnetic separation process are returned to the front stage of strong magnetic separation for recycling separation; magnetic concentrate, magnetic middlings and tailings are obtained, and the titanium grade of the obtained magnetic concentrate is ≥49.5wt%.

[0019] It is best to perform the following two-stage high-intensity magnetic separation: after iron removal, the minerals undergo a first-stage high-intensity magnetic separation to obtain a first-stage high-intensity magnetic separation concentrate, a first-stage high-intensity magnetic separation titanium middlings, and a first-stage high-intensity magnetic separation tailings; during the first-stage high-intensity magnetic separation, the magnetic field strength is 8000-9000 GS, and the frequency of the first roller of the magnetic separator is adjusted to 30-40 Hz and the frequency of the second roller is 40-50 Hz; the titanium dioxide grade of the obtained first-stage high-intensity magnetic separation concentrate is ≥42 wt%, the titanium dioxide grade of the first-stage high-intensity magnetic separation titanium middlings is 27-29 wt%, and the titanium dioxide grade of the first-stage high-intensity magnetic separation tailings is ≤8 wt%. The first-stage high-intensity magnetic separation concentrate is subjected to a second-stage high-intensity magnetic separation to obtain a second-stage high-intensity magnetic separation concentrate, a second-stage high-intensity magnetic separation titanium middlings, and a second-stage high-intensity magnetic separation tailings. During the second-stage high-intensity magnetic separation, the magnetic field strength is 7000–8000 GS, and the frequency of the first roller of the magnetic separator is adjusted to 35–45 Hz and the frequency of the second roller to 45–50 Hz. The titanium dioxide grade of the resulting second-stage high-intensity magnetic separation concentrate is ≥49.5 wt%, and the titanium dioxide grade of the second-stage high-intensity magnetic separation titanium middlings is ≤25 wt%. The second-stage high-intensity magnetic separation titanium middlings are returned to the first-stage high-intensity magnetic separation feed for reprocessing. After two stages of high-intensity magnetic separation, the second-stage high-intensity magnetic separation concentrate is the final magnetic separation concentrate, and the first-stage high-intensity magnetic separation titanium middlings is the final magnetic separation middlings.

[0020] (4) Mix the titanium middlings from the first-stage strong magnetic separation in step (3) with the titanium tailings from the subsequent strong magnetic separation, and perform a final-stage strong magnetic separation to obtain secondary titanium concentrate and final-stage strong magnetic separation tailings. The titanium dioxide grade of the obtained secondary titanium concentrate is ≥45%. The surface field strength of the magnetic separator in the final-stage strong magnetic separation is 7000-8000GS, preferably 7500GS, and the magnetic roller frequency is 40-50HZ. Combine the tailings from the first-stage strong magnetic separation in step (3) and the tailings from the final-stage strong magnetic separation in this step to obtain the total tailings.

[0021] When step (3) uses two-stage strong magnetic separation, this step is as follows: the titanium middlings from the first-stage strong magnetic separation are mixed with the titanium tailings from the second-stage strong magnetic separation and then subjected to three-stage strong magnetic separation to obtain secondary titanium concentrate and tailings from the third-stage strong magnetic separation; the tailings from the first-stage strong magnetic separation and the tailings from the third-stage strong magnetic separation are combined to obtain the total tailings.

[0022] (3) The magnetic separation concentrate is acid-washed with concentrated hydrochloric acid with a mass concentration of 50% to 55% to reduce the content of elements such as calcium and magnesium in the titanium concentrate, so as to obtain titanium concentrate with a titanium dioxide grade of ≥50%. The residual hydrochloric acid is a precursor chemical for toxic testing and has a serious impact on the water and soil environment. It must be neutralized and recycled before use. Direct discharge is strictly prohibited. Example 1

[0023] The technical indicators of the titanium ore in this embodiment are as follows: titanium grade 29.1% (wt) and magnetic iron grade 1.8% (wt).

[0024] According to the operating parameters of the raw ore, the raw ore is dried to a moisture content of ≤0.49%. The dried minerals are then subjected to weak magnetic separation using a dry magnetic separator with a magnetic field strength of 3000GS. After separation, the magnetic iron grade MFe in the minerals is 0.88% (wt), and the ferromagnetic mineral TFe grade is 35.66% (wt).

[0025] The iron-removed minerals were subjected to two-stage dry high-intensity magnetic separation. When the iron-removed minerals entered the first stage of high-intensity magnetic separation, the magnetic field strength was 8000 GS. The frequency of the first roller was adjusted to 30 Hz and the second roller to 40 Hz, resulting in a first-stage high-intensity magnetic separator concentrate of 42.35 wt%, with a titanium middlings grade of approximately 27.81 wt% and a titanium tailings grade of 7.93 wt%. The titanium concentrate from the first stage was then transferred to the second stage of high-intensity magnetic separation, with a magnetic field strength of 7000 GS. The frequency of the first roller was adjusted to 35 Hz and the second roller to 45 Hz, resulting in a second-stage high-intensity magnetic separator concentrate of 49.68 wt%. The titanium middlings were returned to the first stage of high-intensity magnetic separation, and the titanium tailings grade was 25.27 wt%. The first-stage titanium middlings and the second-stage titanium tailings were then mixed and subjected to a third-stage high-intensity magnetic separation, with a surface field strength of 7500 GS and a magnetic roller frequency of 40 Hz, resulting in a secondary titanium concentrate with a titanium dioxide grade of 45.18 wt%.

[0026] The titanium concentrate from the second-stage strong magnetic separation was acid-washed with 50% concentrated hydrochloric acid to reduce the content of elements such as calcium and magnesium in the titanium concentrate, thereby obtaining a titanium concentrate with a titanium dioxide grade of 50.26 wt%.

[0027] The final high-grade titanium products have a titanium grade of 50.26% (wt), secondary titanium concentrate has a grade of 45.18 wt%, and iron concentrate has a total iron grade of 35.66% (wt). Example 2

[0028] The technical indicators of the titanium ore in this embodiment are as follows: titanium grade 29.5% (wt) and magnetic iron grade 1.6% (wt).

[0029] According to the operating parameters of the raw ore, the raw ore is dried to a moisture content of ≤0.41%. The dried minerals are then subjected to weak magnetic separation using a dry magnetic separator with a magnetic field strength of 3000GS. After separation, the magnetic iron grade MFe in the minerals is 0.75% (wt), and the ferromagnetic mineral TFe grade is 34.02% (wt).

[0030] The iron-removed minerals were subjected to two-stage dry high-intensity magnetic separation. When the iron-removed minerals entered the first stage of high-intensity magnetic separation, the magnetic field strength was 8500 GS. The frequency of the first roller was adjusted to 35 Hz and the second roller to 44 Hz, yielding a first-stage high-intensity magnetic separator concentrate of 42.83 wt%, titanium middlings grade of approximately 27.77 wt%, and titanium tailings grade of 7.81 wt%. The titanium concentrate from the first stage was then transferred to the second stage of high-intensity magnetic separation, with a magnetic field strength of 7500 GS. The frequency of the first roller was adjusted to 37 Hz and the second roller to 47 Hz, yielding a second-stage high-intensity magnetic separator concentrate of 49.81 wt%. The titanium middlings were returned to the first stage of high-intensity magnetic separation, and the titanium tailings grade was 25.89 wt%. The first-stage titanium middlings and the second-stage titanium tailings were then mixed and subjected to a third-stage high-intensity magnetic separation, with a surface field strength of 7500 GS and a magnetic roller frequency of 43 Hz, yielding a secondary titanium concentrate with a titanium dioxide grade of 45.28 wt%.

[0031] The titanium concentrate from the second-stage strong magnetic separation was acid-washed with 50% concentrated hydrochloric acid to reduce the content of elements such as calcium and magnesium in the titanium concentrate, thereby obtaining a titanium concentrate with a titanium dioxide grade of 50.33 wt%.

[0032] The final high-grade titanium products have a titanium grade of 50.33% (wt), secondary titanium concentrate has a grade of 45.28 wt%, and iron concentrate has a total iron grade of 34.02% (wt). Example 3

[0033] The technical indicators of the titanium ore in this embodiment are as follows: titanium grade 30.2% (wt) and magnetic iron grade 1.9% (wt).

[0034] According to the operating parameters of the raw ore, the raw ore is dried to a moisture content of ≤0.30%. The dried minerals are then subjected to weak magnetic separation using a dry magnetic separator with a magnetic field strength of 2500GS. After separation, the magnetic iron grade MFe in the minerals is 0.81% (wt), and the ferromagnetic mineral TFe grade is 37.58% (wt).

[0035] The iron-removed minerals were subjected to two-stage dry high-intensity magnetic separation. When the iron-removed minerals entered the first stage of high-intensity magnetic separation, the magnetic field strength was 9000 GS. The frequency of the first roller was adjusted to 35 Hz and the second roller to 45 Hz, yielding a first-stage high-intensity magnetic separator concentrate of 42.72 wt%, titanium middlings grade of approximately 27.90 wt%, and titanium tailings grade of 7.83 wt%. The titanium concentrate from the first stage entered the second stage of high-intensity magnetic separation, with a magnetic field strength of 8000 GS. The frequency of the first roller was adjusted to 37 Hz and the second roller to 46 Hz, yielding a second-stage high-intensity magnetic separator concentrate of 49.82 wt%. The titanium middlings were returned to the first stage of high-intensity magnetic separation, and the titanium tailings grade was 25.62 wt%. The first-stage titanium middlings and the second-stage titanium tailings were mixed and subjected to a third-stage high-intensity magnetic separation, with a surface field strength of 7500 GS and a magnetic roller frequency of 42 Hz, yielding a secondary titanium concentrate with a titanium dioxide grade of 45.31 wt%.

[0036] The titanium concentrate from the second-stage strong magnetic separation was acid-washed with 50% concentrated hydrochloric acid to reduce the content of elements such as calcium and magnesium in the titanium concentrate, thereby obtaining a titanium concentrate with a titanium dioxide grade of 50.41 wt%.

[0037] The final high-grade titanium products have a titanium grade of 50.41% (wt), secondary titanium concentrate has a grade of 45.31 wt%, and iron concentrate has a total iron grade of 37.58% (wt). Example 4

[0038] The technical indicators of the titanium ore in this embodiment are as follows: titanium grade 30.5% (wt) and magnetic iron grade 1.5% (wt).

[0039] According to the operating parameters of the raw ore, the raw ore is dried to a moisture content of ≤0.38%. The dried minerals are then subjected to weak magnetic separation using a dry magnetic separator with a magnetic field strength of 2800GS. After separation, the magnetic iron grade MFe in the minerals is 0.65% (wt), and the ferromagnetic mineral TFe grade is 35.06% (wt).

[0040] The iron-removed minerals were subjected to two-stage dry high-intensity magnetic separation. When the iron-removed minerals entered the first stage of high-intensity magnetic separation, the magnetic field strength was 8200 GS. The frequency of the first roller was adjusted to 36 Hz and the second roller to 41 Hz, yielding a first-stage high-intensity magnetic separator concentrate of 42.98 wt%, titanium middlings grade of approximately 28.01 wt%, and titanium tailings grade of 7.91 wt%. The titanium concentrate from the first stage entered the second stage of high-intensity magnetic separation, with a magnetic field strength of 7700 GS. The frequency of the first roller was adjusted to 40 Hz and the second roller to 48 Hz, yielding a second-stage high-intensity magnetic separator concentrate of 49.76 wt%. The titanium middlings were returned to the first stage of high-intensity magnetic separation, and the titanium tailings grade was 25.31 wt%. The first-stage titanium middlings and the second-stage titanium tailings were mixed and subjected to a third-stage high-intensity magnetic separation, with a surface field strength of 7500 GS and a magnetic roller frequency of 45 Hz, yielding a secondary titanium concentrate with a titanium dioxide grade of 45.33 wt%.

[0041] The titanium concentrate from the second-stage strong magnetic separation was acid-washed with 50% concentrated hydrochloric acid to reduce the content of elements such as calcium and magnesium in the titanium concentrate, thereby obtaining a titanium concentrate with a titanium dioxide grade of 50.71 wt%.

[0042] The final high-grade titanium products have a titanium grade of 50.71% (wt), secondary titanium concentrate has a grade of 45.33 wt%, and iron concentrate has a total iron grade of 35.06% (wt). Example 5

[0043] The technical indicators of the titanium ore in this embodiment are as follows: titanium grade 31.2% (wt) and magnetic iron grade 1.9% (wt).

[0044] According to the operating parameters of the raw ore, the raw ore is dried to a moisture content of ≤0.26%. The dried minerals are then subjected to weak magnetic separation using a dry magnetic separator with a magnetic field strength of 2900GS. After separation, the magnetic iron grade MFe in the minerals is 0.91% (wt), and the ferromagnetic mineral TFe grade is 37.72% (wt).

[0045] The iron-removed minerals were subjected to two-stage dry high-intensity magnetic separation. When the iron-removed minerals entered the first stage of high-intensity magnetic separation, the magnetic field strength was 8700 GS. The frequency of the first roller was adjusted to 40 Hz and the second roller to 50 Hz, yielding a first-stage high-intensity magnetic separator concentrate of 43.19 wt%, titanium middlings grade of approximately 28.81 wt%, and titanium tailings grade of 8.09 wt%. The titanium concentrate from the first stage entered the second stage of high-intensity magnetic separation, with a magnetic field strength of 7400 GS. The frequency of the first roller was adjusted to 45 Hz and the second roller to 50 Hz, yielding a second-stage high-intensity magnetic separator concentrate of 50.04 wt%. The titanium middlings were returned to the first stage of high-intensity magnetic separation, and the titanium tailings grade was 25.91 wt%. The first-stage titanium middlings and the second-stage titanium tailings were mixed and subjected to a third-stage high-intensity magnetic separation, with a surface field strength of 7500 GS and a magnetic roller frequency of 50 Hz, yielding a secondary titanium concentrate with a titanium dioxide grade of 45.48 wt%.

[0046] The titanium concentrate from the second-stage strong magnetic separation was acid-washed with 50% concentrated hydrochloric acid to reduce the content of elements such as calcium and magnesium in the titanium concentrate, thereby obtaining a titanium concentrate with a titanium dioxide grade of 50.68 wt%.

[0047] The final high-grade titanium products have a titanium grade of 50.68% (wt), secondary titanium concentrate has a grade of 45.48 wt%, and iron concentrate has a total iron grade of 37.72% (wt).

Claims

1. A mineral processing method for separating 50% titanium concentrate using titanium middlings, characterized in that, The steps include: (1) removing iron from titanium ore raw materials by weak magnetic separation; (2) Perform two or more strong magnetic separations on the iron-removed minerals, and return the middlings generated during the strong magnetic separation process to the previous strong magnetic separation for recycling separation; to obtain magnetic concentrate, magnetic middlings and tailings; (3) The magnetic separation concentrate is subjected to acid washing to obtain titanium concentrate with a titanium dioxide grade of ≥50%.

2. The mineral processing method for separating 50% titanium concentrate using titanium middlings according to claim 1, characterized in that: In step (1), the titanium grade of the titanium ore raw material is 29wt% to 33wt%.

3. The mineral processing method for separating 50% titanium concentrate using titanium middlings according to claim 1, characterized in that: In step (1), the iron content in the mineral after iron removal is ≤1wt%.

4. The mineral processing method for separating 50% titanium concentrate using titanium middlings according to claim 1, characterized in that: In step (2), two-stage strong magnetic separation is used.

5. A mineral processing method for separating 50% titanium concentrate using titanium middlings according to claim 4, characterized in that: During the first stage of strong magnetic separation, adjust the frequency of the first roller of the magnetic separator to 30-40 Hz and the frequency of the second roller to 40-50 Hz; the titanium grade of the concentrate from the first stage of strong magnetic separation should be ≥42 wt%.

6. A mineral processing method for separating 50% titanium concentrate using titanium middlings according to claim 4, characterized in that: During the second-stage high-intensity magnetic separation, adjust the frequency of the first roller of the magnetic separator to 35-45 Hz and the frequency of the second roller to 45-50 Hz; the titanium grade of the concentrate from the second-stage high-intensity magnetic separation should be ≥49.5 wt%.

7. A mineral processing method for separating 50% titanium concentrate using titanium middlings according to claim 1, characterized in that: In step (3), concentrated hydrochloric acid is used to acid wash the magnetic concentrate.

8. A mineral processing method for separating 50% titanium concentrate using titanium middlings according to any one of claims 1-7, characterized in that, It also includes the following steps: mixing the titanium middlings from the first stage of strong magnetic separation with the titanium tailings from the subsequent stage of strong magnetic separation and then performing strong magnetic separation again to obtain secondary titanium concentrate.

9. A mineral processing method for separating 50% titanium concentrate using titanium middlings according to claim 8, characterized in that: When performing strong magnetic separation again, the surface field strength of the magnetic separator is 7000-8000 GS, and the magnetic roller frequency is 40-50 Hz.

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