Pre-concentration and tailing discarding process for vanadium titano-magnetite

Abstract

The invention discloses a pre-concentration and tailing discarding process for vanadium titano-magnetite, and relates to the technical field of vanadium titano-magnetite beneficiation, and the pre-concentration and tailing discarding process comprises the following steps: raw ore is subjected to crushing operation to obtain a crushed product, and the crushed product is fed into high-pressure roller grinding operation to obtain a high-pressure roller grinding product; the high-pressure roller-milled product is subjected to screening operation, and an oversize product with the large particle size and an undersize product with the small particle size are obtained; the undersize products are subjected to first weak magnetic pre-concentration operation, tailings obtained through the first weak magnetic pre-concentration operation are subjected to first strong magnetic pre-concentration operation, concentrate obtained through the first weak magnetic pre-concentration operation and concentrate obtained through the first strong magnetic pre-concentration operation are combined into final pre-concentration concentrate, and the tailings obtained through the first strong magnetic pre-concentration operation serve as one part of final tailings; the oversize products are subjected to second weak magnetic pre-concentration operation, tailings obtained through the second weak magnetic pre-concentration operation are subjected to second strong magnetic pre-concentration operation, and concentrate obtained through the second weak magnetic pre-concentration operation and concentrate obtained through the second strong magnetic pre-concentration operation are combined and then returned to the high-pressure roller grinding operation; tailings obtained by the second strong magnetic pre-separation operation are used as one part of final tailings. According to the method, crushing, high-pressure roller grinding and screening are adopted, oversize and undersize products obtained through screening are subjected to magnetic separation, pre-concentration and tailing discarding, oversize product pre-concentration concentrate is returned to the high-pressure roller grinding, the subsequent ore grinding and selecting cost is effectively reduced, the iron and titanium grades of subsequent ore entering the grinding process are improved, the load capacity of the high-pressure roller grinding machine can be reduced, and energy consumption and production cost are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of vanadium-titanium magnetite beneficiation, in particular to a vanadium-titanium magnetite pre-selection tailings discarding process. Background Art

[0002] Vanadium-titanium magnetite is a composite mineral resource containing iron, vanadium and titanium. Iron is an essential raw material for steel smelting, vanadium is called "MSG of modern industry", and titanium is known as "space metal". Vanadium-titanium magnetite resources are widely used in defense, military, metallurgy, aerospace, electronic technology and materials science.

[0003] At present, the processing of vanadium-titanium magnetite (especially low-grade vanadium-titanium magnetite) generally requires pre-selection and tailings discarding. The main methods of pre-selection and tailings discarding include dry magnetic separation and tailings discarding, wet magnetic separation and tailings discarding, dry-wet combined magnetic separation and tailings discarding, photoelectric intelligent separation and tailings discarding, etc. Traditional dry magnetic separation and tailings discarding are generally used for dry separation of large pieces of ore and strong magnetic separation of coarse-grained minerals. The equipment used is mainly magnetic pulleys and heavy magnetic pull concentrators. This process can discard large pieces or coarse particles of waste rock in advance and reduce equipment energy consumption, but it is not very suitable for useful minerals with finer embedded particles; wet magnetic separation and tailings discarding are mainly used for the selection of fine-grained magnetic minerals, generally using wet magnetic separators and high-gradient magnetic separators, but require pre-grinding to achieve monomer dissociation, and the crushing and grinding energy consumption is large. In addition, the processing capacity of the equipment used is also limited; the dry-wet combined magnetic separation and tailings discarding process is mainly for vanadium-titanium magnetite ores with uneven coarse and fine distribution of useful minerals.

[0004] Ore grinding is a key process in the mining industry, which is crucial to improving the selectivity of ore, reducing production costs and increasing the recovery rate of ore. However, traditional grinding equipment has some problems in grinding efficiency and energy consumption, so more efficient grinding technology is needed. As a new type of grinding technology, high-pressure roller grinding technology has attracted much attention in recent years. This technology crushes and finely grinds the ore by applying high pressure, and has a unique working principle and advantages. The traditional high-pressure roller grinding-classification process directly returns the coarse-grained product to form a closed-circuit roller grinding, resulting in a large load on the high-pressure roller grinding machine, which is not only not conducive to energy saving but also limits the ore processing capacity of the high-pressure roller grinding machine. Summary of the invention

[0005] The purpose of the present invention is to provide a vanadium-titanium magnetite pre-selection tailings discarding process, reduce the energy consumption in the vanadium-titanium magnetite pre-selection process, simplify the process flow, improve the efficiency of pre-selection tailings discarding, and improve the iron and titanium grades of the pre-selected concentrate.

[0006] The present invention solves the above problems through the following technical solutions:

[0007] A vanadium-titanium magnetite pre-selection tailings discarding process, comprising:

[0008] Step (1), the crushed product obtained by crushing the raw ore is fed into a high pressure roller mill to obtain a high pressure roller mill product;

[0009] Step (2), feeding the high pressure roller mill product to a screening operation to obtain a coarser-sized oversize product and a finer-sized undersize product;

[0010] Step (3), feeding the underscreen product into a first weak magnetic pre-selection operation, feeding the tailings obtained from the first weak magnetic pre-selection operation into a first strong magnetic pre-selection operation, combining the concentrate obtained from the first weak magnetic pre-selection operation and the concentrate obtained from the first strong magnetic pre-selection operation into a final pre-selected concentrate, and the tailings obtained from the first strong magnetic pre-selection operation as part of the final tailings;

[0011] The above-screen product is fed into the second weak magnetic pre-selection operation, the tailings obtained from the second weak magnetic pre-selection operation is fed into the second strong magnetic pre-selection operation, the concentrate obtained from the second weak magnetic pre-selection operation and the concentrate obtained from the second strong magnetic pre-selection operation are combined and returned to the high-pressure roller mill operation, and the tailings obtained from the second strong magnetic pre-selection operation are used as part of the final tailings.

[0012] Further preferably, the particle size of the crushed product is 15 to 50 mm.

[0013] Further preferably, the screening equipment is a vibrating screen with a screen hole size of 3 to 5 mm.

[0014] Further preferably, the magnetic field strength of the first weak magnetic pre-selection operation is 2000-3000Gs, and the moisture content of the feed ore of the first weak magnetic pre-selection operation is less than 3%; the magnetic field strength of the first strong magnetic pre-selection operation is 10000-14000Gs, and the moisture content of the feed ore of the first strong magnetic pre-selection operation is less than 3%.

[0015] Further preferably, the magnetic field strength of the second weak magnetic pre-selection operation is 2000-3000Gs, and the moisture content of the feed ore of the second weak magnetic pre-selection operation is less than 3%; the magnetic field strength of the second strong magnetic pre-selection operation is 10000-14000Gs, and the moisture content of the feed ore of the second strong magnetic pre-selection operation is less than 3%.

[0016] Further preferably, the first weak magnetic pre-selection operation, the second weak magnetic pre-selection operation, the first strong magnetic pre-selection operation, and the second strong magnetic pre-selection operation all use a dry permanent magnetic drum magnetic separator.

[0017] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0018] (1) The process of the present invention is simple, easy to operate, low in cost, energy-saving and environmentally friendly, has a large processing capacity, and a high waste rate, and can effectively improve the grade of iron and titanium in the pre-selected concentrate.

[0019] (2) The present invention adopts conventional crushing, high-pressure roller milling and screening. The above-screen and below-screen products obtained by screening are magnetically pre-selected and discarded, and the above-screen products are pre-selected as concentrates and returned to the high-pressure roller mill. This can not only effectively reduce the subsequent ore grinding cost and improve the iron and titanium grade of the subsequent ore entering the mill, but also reduce the load of the high-pressure roller mill, further reduce energy consumption and reduce production costs.

[0020] (3) The present invention effectively realizes the pre-selection and tailings discarding of vanadium-titanium magnetite by accurately controlling parameters such as screening particle size, weak magnetic separation magnetic field strength and feed moisture content, strong magnetic separation magnetic field strength and feed moisture content. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a flow chart of the present invention. DETAILED DESCRIPTION

[0022] The present invention is further described in detail below in conjunction with examples, but the embodiments of the present invention are not limited thereto.

[0023] Embodiment 1:

[0024] Combined with Figure 1 As shown, a vanadium-titanium magnetite pre-selection tailings discarding process comprises:

[0025] The selected vanadium-titanium magnetite ore sample has a Fe grade of 13.92%, a mFe grade of 4.87% and a TiO2 grade of 6.24% in the original ore. It is a low-grade vanadium-titanium magnetite.

[0026] (1) The vanadium-titanium magnetite ore is crushed to -25 mm and then fed into a high pressure roller mill, and the high pressure roller mill product is fed into the next step.

[0027] (2) The high-pressure roller mill product obtained in step (1) is fed into a vibrating screen with a mesh size of 3 mm for screening, and the obtained product below the mesh -3 mm and the product above the mesh +3 mm are respectively sent to the next step of operation.

[0028] (3) The -3 mm product under the screen obtained in step (2) is fed into a weak magnetic pre-selection operation, and the equipment used is a dry permanent magnetic drum magnetic separator with a magnetic field strength of 3000 Gs, and the moisture content of the ore is 1.12%. The obtained weak magnetic pre-selection tailings are fed into a strong magnetic pre-selection operation, and the equipment used is a dry permanent magnetic drum magnetic separator with a magnetic field strength of 10000 Gs, and the moisture content of the ore is 1.19%. The obtained weak magnetic pre-selection concentrate and strong magnetic pre-selection concentrate are combined into a final pre-selection concentrate, and the obtained strong magnetic pre-selection tailings are discarded as final tailings.

[0029] (4) The above-screen +3mm product obtained in step (2) is fed to a weak magnetic pre-selection operation, and the equipment used is a dry permanent magnetic drum magnetic separator with a magnetic field strength of 3000Gs, and the moisture content of the ore is 0.81%. The weak magnetic pre-selection tailings are fed to a strong magnetic pre-selection operation, and the equipment used is a dry permanent magnetic drum magnetic separator with a magnetic field strength of 10000Gs, and the moisture content of the ore is 0.79%. The obtained weak magnetic pre-selection concentrate and strong magnetic pre-selection concentrate are combined and returned to the high pressure roller mill operation, and the obtained strong magnetic pre-selection tailings are discarded as final tailings.

[0030] Through the above process, the tailings with a yield of 19.14% and TFe, mFe and TiO2 grades of 6.14%, 0.24% and 1.81% respectively can be discarded. The obtained pre-selected concentrate has a yield of 80.86%, TFe, mFe and TiO2 grades of 15.76%, 5.97% and 7.29% respectively, and the recovery rates are 91.56%, 99.06% and 94.45% respectively.

[0031] Embodiment 2:

[0032] Combined with Figure 1 As shown, a vanadium-titanium magnetite pre-selection tailings discarding process comprises:

[0033] The selected vanadium-titanium magnetite ore sample has a Fe grade of 20.17%, a mFe grade of 12.26% and a TiO2 grade of 8.78% in the original ore. It is a low-grade vanadium-titanium magnetite.

[0034] (1) The vanadium-titanium magnetite ore is crushed to -15 mm and then fed into a high pressure roller mill, and the high pressure roller mill product is fed into the next step.

[0035] (2) The high-pressure roller mill product obtained in step (1) is fed into a vibrating screen with a mesh size of 4 mm for screening, and the obtained product below the mesh -4 mm and the product above the mesh +4 mm are respectively sent to the next step of operation.

[0036] (3) The -4 mm product under the screen obtained in step (2) is fed to a weak magnetic pre-selection operation, and the equipment used is a dry permanent magnetic drum magnetic separator with a magnetic field strength of 2000 Gs, and the moisture content of the ore is 2.49%. The obtained weak magnetic pre-selection tailings are fed to a strong magnetic pre-selection operation, and the equipment used is a dry permanent magnetic drum magnetic separator with a magnetic field strength of 12000 Gs, and the moisture content of the ore is 2.98%. The obtained weak magnetic pre-selection concentrate and the strong magnetic pre-selection concentrate are combined into a final pre-selection concentrate, and the obtained strong magnetic pre-selection tailings are discarded as final tailings.

[0037] (4) The above-screen +4 mm product obtained in step (2) is fed to a weak magnetic pre-selection process, and the equipment used is a dry permanent magnetic drum magnetic separator with a magnetic field strength of 2500 Gs, and the moisture content of the ore is 2.14%. The weak magnetic pre-selection tailings are fed to a strong magnetic pre-selection process, and the equipment used is a dry permanent magnetic drum magnetic separator with a magnetic field strength of 14000 Gs, and the moisture content of the ore is 2.81%. The obtained weak magnetic pre-selection concentrate and strong magnetic pre-selection concentrate are combined and returned to the high pressure roller mill process, and the obtained strong magnetic pre-selection tailings are discarded as final tailings.

[0038] Through the above process, the tailings with a yield of 25.16% and TFe, mFe and TiO2 grades of 7.03%, 0.21% and 1.54% respectively can be discarded. The obtained pre-selected concentrate has a yield of 74.84%, TFe, mFe and TiO2 grades of 24.59%, 16.31% and 11.21% respectively, and the recovery rates are 91.23%, 99.57% and 95.59% respectively.

[0039] Embodiment 3:

[0040] Combined with Figure 1 As shown, a vanadium-titanium magnetite pre-selection tailings discarding process comprises:

[0041] The selected vanadium-titanium magnetite ore sample has a Fe grade of 28.69%, a mFe grade of 10.07% and a TiO2 grade of 13.19% in the original ore. It is a bee-shaped vanadium-titanium magnetite.

[0042] (1) The vanadium-titanium magnetite ore is crushed to -50 mm and then fed into a high pressure roller mill, and the high pressure roller mill product is fed into the next step.

[0043] (2) The high-pressure roller mill product obtained in step (1) is fed into a vibrating screen with a mesh size of 5 mm for screening, and the obtained product below the mesh -5 mm and the product above the mesh +5 mm are respectively sent to the next step.

[0044] (3) The -5 mm product under the screen obtained in step (2) is fed to a weak magnetic pre-selection operation, and the equipment used is a dry permanent magnetic drum magnetic separator with a magnetic field strength of 2600 Gs, and the moisture content of the ore is 0.52%. The obtained weak magnetic pre-selection tailings are fed to a strong magnetic pre-selection operation, and the equipment used is a dry permanent magnetic drum magnetic separator with a magnetic field strength of 14000 Gs, and the moisture content of the ore is 0.72%. The obtained weak magnetic pre-selection concentrate and the strong magnetic pre-selection concentrate are combined into a final pre-selection concentrate, and the obtained strong magnetic pre-selection tailings are discarded as final tailings.

[0045] (4) The product above the screen +5 mm obtained in step (2) is fed to a weak magnetic pre-selection operation, and the equipment used is a dry permanent magnetic drum magnetic separator with a magnetic field strength of 2000 Gs, and the moisture content of the ore is 1.81%. The tailings from the weak magnetic pre-selection are fed to a strong magnetic pre-selection operation, and the equipment used is a dry permanent magnetic drum magnetic separator with a magnetic field strength of 13000 Gs, and the moisture content of the ore is 2.29%. The obtained weak magnetic pre-selection concentrate and strong magnetic pre-selection concentrate are combined and returned to the high pressure roller mill operation, and the obtained strong magnetic pre-selection tailings are discarded as final tailings.

[0046] Through the above process, the tailings with a yield of 17.59% and TFe, mFe and TiO2 grades of 15.12%, 0.47% and 3.44% respectively can be discarded. The obtained pre-selected concentrate has a yield of 82.41%, TFe, mFe and TiO2 grades of 32.14%, 12.12% and 15.27% respectively, and the recovery rates are 92.31%, 99.18% and 95.42% respectively.

[0047] Although the present invention is described herein with reference to the illustrative embodiments of the present invention, the above embodiments are only preferred embodiments of the present invention, and the embodiments of the present invention are not limited to the above embodiments. It should be understood that those skilled in the art can design many other modifications and embodiments, which will fall within the scope and spirit of the principles disclosed in this application.

Claims

1. A vanadium-titanium magnetite pre-selection tailings discarding process, characterized in that: include: Step (1), the crushed product obtained by crushing the raw ore is fed into a high pressure roller mill to obtain a high pressure roller mill product; Step (2), feeding the high pressure roller mill product to a screening operation to obtain a coarser-sized oversize product and a finer-sized undersize product; Step (3), feeding the underscreen product into a first weak magnetic pre-selection operation, feeding the tailings obtained from the first weak magnetic pre-selection operation into a first strong magnetic pre-selection operation, combining the concentrate obtained from the first weak magnetic pre-selection operation and the concentrate obtained from the first strong magnetic pre-selection operation into a final pre-selected concentrate, and the tailings obtained from the first strong magnetic pre-selection operation as part of the final tailings; The above-screen product is fed into the second weak magnetic pre-selection operation, the tailings obtained from the second weak magnetic pre-selection operation is fed into the second strong magnetic pre-selection operation, the concentrate obtained from the second weak magnetic pre-selection operation and the concentrate obtained from the second strong magnetic pre-selection operation are combined and returned to the high-pressure roller mill operation, and the tailings obtained from the second strong magnetic pre-selection operation are used as part of the final tailings.

2. A vanadium-titanium magnetite pre-selection tailings discarding process according to claim 1, characterized in that: The particle size of the crushed product is 15 to 50 mm.

3. A vanadium-titanium magnetite pre-selection tailings discarding process according to claim 1, characterized in that: The screening equipment is a vibrating screen with a screen hole size of 3 to 5 mm.

4. A vanadium-titanium magnetite pre-selection tailings discarding process according to claim 1, characterized in that: The magnetic field strength of the first weak magnetic pre-selection operation is 2000-3000Gs, and the moisture content of the feed ore of the first weak magnetic pre-selection operation is less than 3%; the magnetic field strength of the first strong magnetic pre-selection operation is 10000-14000Gs, and the moisture content of the feed ore of the first strong magnetic pre-selection operation is less than 3%.

5. A vanadium-titanium magnetite pre-selection tailings discarding process according to claim 1, characterized in that: The magnetic field strength of the second weak magnetic pre-selection operation is 2000-3000Gs, and the moisture content of the feed ore of the second weak magnetic pre-selection operation is less than 3%; the magnetic field strength of the second strong magnetic pre-selection operation is 10000-14000Gs, and the moisture content of the feed ore of the second strong magnetic pre-selection operation is less than 3%.

6. A vanadium-titanium magnetite pre-selection tailings discarding process according to claim 1, characterized in that: The first weak magnetic pre-selection operation, the second weak magnetic pre-selection operation, the first strong magnetic pre-selection operation, and the second strong magnetic pre-selection operation all use dry permanent magnetic drum magnetic separators.

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