CN110773317A - Combined pre-selection waste-throwing process for complex symbiotic refractory iron ore - Google Patents
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- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
- B03C1/10—Magnetic separation acting directly on the substance being separated with cylindrical material carriers
- B03C1/12—Magnetic separation acting directly on the substance being separated with cylindrical material carriers with magnets moving during operation; with movable pole pieces
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- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
- B03C1/30—Combinations with other devices, not otherwise provided for
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Abstract
The invention belongs to the technical field of mineral processing, and discloses a combined pre-selection waste-throwing process for complex symbiotic refractory iron ores, which comprises the steps of crushing the symbiotic refractory iron ores to 0-50mm, and screening the crushed symbiotic refractory iron ores into two size fractions of 0-10mm and 10-50 mm. Pre-separating and separating 10-50mm size grade symbiotic refractory iron ore by using a magnetic pulley, wherein the pre-separation concentrate is magnetite and the pre-separation tail is weakly magnetic iron ore and surrounding rock; then separating 10-50mm size fraction weak magnetic iron ore and surrounding rock by adopting an X-ray transmission intelligent preselector, wherein the preselection is fine for the weak magnetic iron ore, and the preselection tail is the surrounding rock; carrying out separation and preselection operation of magnetite, weakly magnetic iron ore and surrounding rock on 0-10mm size grade symbiotic refractory iron ore by adopting a spiral dry magnetic separator, wherein the preselection concentrate is magnetite, and the preselection tail is mixed tailings of the weakly magnetic iron ore and the surrounding rock; the spiral dry magnetic separator is adopted to perform separation and preselection operation of weak magnetic iron ore and surrounding rock on preselection tailings with the size fraction of 0-10mm, the preselection concentrate is the weak magnetic iron ore, and the preselection tailings are the surrounding rock.
Description
Technical Field
The invention relates to the technical field of mineral processing, in particular to a combined pre-selection waste-throwing process for complex symbiotic refractory iron ores.
Background
The resource of iron ore in China is poor, the quantity of magnetic ore is less, and the refractory iron ore formed by the symbiosis of magnetite, hematite, siderite and limonite accounts for more than 50 percent of the total reserve of the iron ore, such as small-sized Qinghai-Longiang iron ore, Gansu four-channel ditch iron ore and the like. If the symbiotic refractory iron ore is treated by adopting a single magnetic separation process, the metal recovery rate only reaches 50-60 percent, resource waste is caused, the grade of iron ore concentrate obtained by strong magnetic separation is only about 50 percent, the metal recovery rate is about 70 percent, the grade of tailings is as high as 18-20 percent, and the problem that the utilization rate of the iron ore is low or the iron ore cannot be utilized exists. And the surrounding rock content is 15-20%, and the problem that the surrounding rock and the weakly magnetic ore cannot be effectively separated in a pre-selection mode exists.
Disclosure of Invention
The invention aims to solve the technical problems and provides a combined pre-selection waste-throwing process for complex symbiotic refractory iron ores, which adopts different process equipment to effectively separate magnetite, weak magnetic iron ores and surrounding rocks from 0-10mm and 10-50mm symbiotic refractory iron ores respectively.
In order to achieve the purpose, the invention adopts the following technical scheme:
a combined pre-selection waste-throwing process for complex symbiotic refractory iron ores comprises the following steps:
1) crushing symbiotic refractory iron ores to 0-50mm, and screening into two size fractions of 0-10mm and 10-50 mm;
2) pre-separating the 10-50mm size fraction symbiotic refractory iron ore in the step 1) by adopting a magnetic pulley with the field intensity of 1800-2200 Oe, wherein the pre-separated concentrate is magnetite, and the pre-separated tailings are weakly magnetic iron ore and surrounding rock;
3) separating the 10-50mm size fraction weak magnetic iron ore and the surrounding rock in the step 2) by adopting an X-ray transmission intelligent preselector, wherein the preselection concentrate is the weak magnetic iron ore, and the preselection tailings are the surrounding rock;
4) carrying out separation and preselection operation on magnetite, weakly magnetic iron ore and surrounding rock on the 0-10mm size fraction symbiotic refractory iron ore in the step 1) by adopting a spiral dry magnetic separator with the field intensity of 2200-;
5) and then, carrying out separation and preselection operation on the low-magnetic iron ore and the surrounding rock on the 0-10mm size fraction preselection tailings in the step 4) by adopting a spiral dry magnetic separator with the field intensity of 8000-8500 Oe, wherein the preselection concentrate is the low-magnetic iron ore, and the preselection tailings are the surrounding rock.
2. The combined pre-selection waste-throwing process of the complex symbiotic refractory iron ore according to claim 1, which is characterized in that: the symbiotic refractory iron ore in the step 1) comprises magnetite, weakly magnetic iron ore and surrounding rock; the weakly magnetic iron ore in the step 2) comprises hematite, limonite and siderite.
Further, the symbiotic refractory iron ore in the step 1) comprises magnetite, weakly magnetic iron ore and surrounding rock; the weakly magnetic iron ore in the step 2) comprises hematite, limonite and siderite.
Compared with the prior art, the invention has the following beneficial effects:
the symbiotic refractory iron ore disclosed by the invention contains magnetite and weakly magnetic iron ore (hematite, siderite and limonite), the content of the magnetite and weakly magnetic iron ore mixed into the surrounding rock is about 15-20%, if single magnetic separation operation in the prior art is adopted, the hematite and weakly magnetic iron ore cannot be recycled, the process disclosed by the invention can effectively separate the magnetite, the weakly magnetic iron ore and the surrounding rock, the magnetite and the weakly magnetic iron ore respectively enter the next working procedure for treatment, the surrounding rock is directly discharged, and the separation rate of the surrounding rock is more than 95%. The method reduces the ore dressing amount entering the mill, improves the productivity, reduces the cost, simultaneously improves the resource utilization rate, and improves the metal recovery rate from 50% to more than 80%.
The method adopts the field intensity 1800-plus 2200 Oe magnetic pulley to pre-select and separate the 10-50mm size grade symbiotic refractory iron ore, and separates the magnetite from the weakly magnetic iron ore and the surrounding rock, wherein the pre-selection concentrate is the magnetite, and the pre-selection tail is the weakly magnetic iron ore and the surrounding rock; and then separating the 10-50mm size fraction weak magnetic iron ore and the surrounding rock by adopting an X-ray transmission intelligent preselector, wherein the preselection is fine for the weak magnetic iron ore, and the preselection tail is the surrounding rock. The magnetic pulley is a device for effectively pre-separating and discarding magnetite lump ore, the 10-50mm size grade symbiotic refractory iron ore is pre-separated and separated by adopting the field intensity 1800-2200 Oe magnetic pulley, the concentrate is magnetite, the tailings are weak magnetic iron ore and surrounding rock, the 10-50mm weak magnetic iron ore and the surrounding rock are separated, the waste disposal target cannot be reached by adopting the strong magnetic roller, because the inertia force of the lump ore rotating along with the belt is greater than the suction force of the magnetic field to the ore, the ore is discarded along with the surrounding rock, and the purpose of separating the weak magnetic iron ore and the surrounding rock cannot be reached. Therefore, an X-ray transmission intelligent preselector is selected to separate weak magnetic iron ore and surrounding rock of 10-50mm size fraction. The working principle of the X-ray transmission intelligent sorting equipment is a mineral separation method for separating blocky minerals by combining machinery and electricity by simulating the action of hand selection. The method is characterized in that pre-selection throwing waste materials are flatly paved on a 3m/s high-speed rotating belt through a vibrating feeder, X rays transmit and recognize each material above the belt, differences of photoelectric signals are fed back through different mineral components and properties, various ores and surrounding rock information bases are established through computer recognition, during production, an ultrahigh-speed X-ray detector acquisition system transmits and recognizes each material, signals are transmitted to a computer, the computer judges whether the material belongs to ore or waste rock through background quick calculation, an instruction is given to start a spraying execution mechanism to act, waste rock or ore is set through accurate spraying, and minerals are separated. The weak magnetic iron ore with the size fraction of 10-50mm is separated from the surrounding rock in a pre-selection mode, and X-ray transmission intelligent sorting equipment is selected, so that the target that the surrounding rock sorting rate is over 95 can be achieved. By the innovative combination of the magnetic pulleys and the X-ray transmission intelligent sorting equipment, the magnetite, the weakly magnetic iron ore and the surrounding rock in the 10-50mm size-fraction symbiotic refractory iron ore are effectively separated, the magnetite and the weakly magnetic iron ore are treated in the next procedure, the surrounding rock is directly discharged, and the sorting rate of the surrounding rock is over 95 percent. The X-ray transmission intelligent preselection machine is an XNDT-104 preselection machine of Beijing Hurrister science and technology Limited.
Carrying out separation and preselection operation on magnetite, weak magnetic iron ore and surrounding rock on 0-10mm size fraction symbiotic refractory iron ore by adopting a spiral dry magnetic separator with the field intensity of 2200-; and (3) performing separation and preselection operation on magnetite, weakly magnetic iron ore and surrounding rock on the preselection tail with the size fraction of 0-10mm by adopting a spiral dry magnetic separator with the field intensity of 2200-. Because the 0-10mm size fraction intergrowth refractory iron ore has more fine-grained powder and large dust emission, the waste disposal is carried out by adopting a spiral dry magnetic separator, the totally enclosed spiral dry magnetic separator mainly comprises a shell, 2 magnetic rollers internally provided with 360-degree wrap angle fixed magnetic systems and spiral conveying blades welded on the outer cylinder skins of the magnetic systems, the rotating speed of the rollers is controlled by frequency conversion, when the 0-5mm intergrowth refractory iron ore is fed into a magnetic roller separation area from a feeding port, the magnetite is adsorbed on the rollers and pushed to move forward by the spiral blades, and the magnetite is carried out magnetic rolling adsorption for many times under the action of the fixed magnetic systems while moving, so that weak magnetic iron ore and surrounding rock are turned outside, thrown out by the centrifugal force rotating at high speed, fall into a bottom box and are discharged from a tailing discharge port for preselection, and the obtained concentrate is the magnetite and is discharged from a concentrate port. 2 magnetic rollers of the full-sealed spiral dry magnetic separator are arranged in the same full-sealed outer shell, the rotating speed of the rollers is controlled by a frequency conversion system, the rotating speed is set according to the property and index requirements of selected ores, and the full-sealed spiral dry magnetic separator has the advantage of controlling indexes such as rough concentrate grade, metal recovery rate and tailing grade by adjusting the rotating speed of the rollers. Similarly, a spiral dry magnetic separator with the field intensity of 8000-8500 Oe is adopted to separate pre-selection tails of 0-10mm size-grade symbiotic refractory iron ores, namely weak magnetic iron ores and surrounding rocks. The method realizes the effective separation of 0-10mm size fraction symbiotic refractory iron ore magnetite, weakly magnetic iron ore and surrounding rock, the magnetite and the weakly magnetic iron ore are respectively treated in the next process, the surrounding rock is directly discharged, and the surrounding rock separation rate reaches more than 95%.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The invention is further described with reference to the following figures and detailed description.
As shown in figure 1, the combined pre-selection waste-throwing process for the complex symbiotic refractory iron ore is characterized by comprising the following steps of:
1) crushing symbiotic refractory iron ores to 0-50mm, and screening into two size fractions of 0-10mm and 10-50 mm; the symbiotic refractory iron ore comprises magnetite, weakly magnetic iron ore and surrounding rock.
2) And (3) carrying out pre-separation on the 10-50mm size grade symbiotic refractory iron ore by adopting magnetic pulleys with the field intensity of 1800-2200 Oe, wherein the pre-separation concentrate is magnetite, and the pre-separation tailings are weakly magnetic iron ore and surrounding rock. The weakly magnetic iron ore comprises hematite, limonite and siderite.
3) And (3) separating the 10-50mm size fraction weak magnetic iron ore and the surrounding rock by adopting an X-ray transmission intelligent preselector, wherein the preselection concentrate is the weak magnetic iron ore, and the preselection tailings are the surrounding rock.
4) And (3) carrying out separation and preselection operation on magnetite, weakly magnetic iron ore and surrounding rock on 0-10mm size grade symbiotic refractory iron ore by adopting a spiral dry magnetic separator with the field intensity of 2200-.
5) And then, carrying out separation and preselection operation on the low-magnetic iron ore and the surrounding rock on the 0-10mm size fraction preselection tailings in the step 4) by adopting a spiral dry magnetic separator with the field intensity of 8000-8500 Oe, wherein the preselection concentrate is the low-magnetic iron ore, and the preselection tailings are the surrounding rock.
Example 1
The symbiotic refractory iron ore is derived from four channel iron ores in Gansu province, the iron grade is 32 percent, wherein 15 percent of magnetite, 70 percent of weak magnetic iron ore and 15 percent of surrounding rock are mixed, and the iron ore is processed according to the following steps:
A. crushing the symbiotic refractory iron ore to 0-50mm, and screening to obtain two size fractions of 0-10mm and 10-50mm, wherein the yield of 0-10mm symbiotic refractory ore dressing is 45%, the yield of magnetite is 6.75%, the yield of weakly magnetic iron ore is 31.5%, and the yield of surrounding rock is 6.75%; the yield of the 10-50mm size grade symbiotic refractory ore dressing is 55%, the yield of the magnetite ore is 8.25%, the yield of the weakly magnetic iron ore is 38.5%, and the yield of the surrounding rock is 8.25%.
B. Pre-selecting and separating 10-50mm size grade symbiotic refractory iron ore by using a field intensity 1800 Oe magnetic pulley to obtain indexes of 15.78% of magnetite operation yield, 8.68% of raw ore yield, 84.22% of weak magnetic iron ore and surrounding rock operation yield and 46.32% of raw ore yield; and then separating weak magnetic iron ore with the size fraction of 10-50mm from surrounding rock by using an X-ray transmission intelligent preselector to obtain indexes of 82.35% of operation yield of the weak magnetic iron ore, 38.14% of raw ore yield, 17.65% of operation yield of the surrounding rock and 8.18% of raw ore yield, and the surrounding rock separation rate is 95%.
C. The separation and preselection operation of magnetite, weakly magnetic iron ore and surrounding rock is carried out on 0-10mm size grade symbiotic refractory iron ore by adopting a spiral dry magnetic separator with the field intensity of 2200 Oe, and indexes of 15.78% of magnetite operation yield, 7.1% of raw ore yield, 84.22% of weakly magnetic iron ore and surrounding rock operation yield and 37.9% of raw ore yield are obtained.
D. And then separating the weak magnetic iron ore with the size fraction of 0-10mm from the surrounding rock by adopting a spiral dry magnetic separator with the field intensity of 8000Oe to obtain indexes of 82.35% of the operation yield of the weak magnetic iron ore, 31.21% of the yield of the raw ore, 17.65% of the operation yield of the surrounding rock, 6.69% of the yield of the raw ore and 95% of the sorting rate of the surrounding rock.
E. Through the preselection separation of different equipment, effective separation of magnetite, weakly magnetic iron ore and surrounding rock is realized, the indexes of 15.78% of magnetite yield, 69.35% of weakly magnetic iron ore yield and 14.87% of surrounding rock yield are obtained, effective separation of magnetite, weakly magnetic iron ore and surrounding rock in the symbiotic refractory iron ore is realized, and conditions are created for improving the productivity and reducing the cost of the next process.
Example 2
The symbiotic refractory iron ore is derived from four channel iron ores in Gansu province, the iron grade is 30 percent, 15 percent of magnetite, 70 percent of weak magnetic iron ore and 15 percent of surrounding rock are mixed, and the iron ore is processed according to the following steps:
A. crushing the symbiotic refractory iron ore to 0-50mm, and screening to obtain two size fractions of 0-10mm and 10-50mm, wherein the yield of 0-10mm symbiotic refractory ore dressing is 45%, the yield of magnetite is 6.75%, the yield of weakly magnetic iron ore is 31.5%, and the yield of surrounding rock is 6.75%; the yield of the 10-50mm size grade symbiotic refractory ore dressing is 55%, the yield of the magnetite ore is 8.25%, the yield of the weakly magnetic iron ore is 38.5%, and the yield of the surrounding rock is 8.25%.
B. Pre-separating 10-50mm size grade symbiotic refractory iron ore by using a field intensity 2000 Oe magnetic pulley to obtain indexes of 15.3% of magnetite operation yield, 8.41% of raw ore yield, 84.7% of weak magnetic iron ore and surrounding rock operation yield and 46.59% of raw ore yield; and then separating the weak magnetic iron ore with the size fraction of 10-50mm from the surrounding rock by using an X-ray transmission intelligent preselector to obtain indexes of 76.47% of the operation yield of the weak magnetic iron ore, 35.63% of the yield of raw ore, 23.53% of the operation yield of the surrounding rock and 10.96% of the yield of the raw ore, and 97% of the selection rate of the surrounding rock.
C. The separation and preselection operation of magnetite, weakly magnetic iron ore and surrounding rock is carried out on 0-10mm size grade symbiotic refractory iron ore by adopting a spiral dry magnetic separator with the field intensity of 2600 Oe, and indexes of 15.3% of magnetite operation yield, 6.89% of raw ore yield, 84.7% of weakly magnetic iron ore and surrounding rock operation yield and 38.11% of raw ore yield are obtained.
D. And then separating the weak magnetic iron ore with the size fraction of 0-10mm from the surrounding rock by adopting a field intensity 8200Oe spiral dry magnetic separator to obtain the indexes of 76.47% of the operation yield of the weak magnetic iron ore, 29.14% of the yield of the raw ore, 23.53% of the operation yield of the surrounding rock, 8.97% of the yield of the raw ore and 95% of the sorting rate of the surrounding rock.
E. Through the preselection separation of different equipment, effective separation of magnetite, weakly magnetic iron ore and surrounding rock is realized, the indexes of 15.78% of magnetite yield, 69.35% of weakly magnetic iron ore yield and 14.87% of surrounding rock yield are obtained, effective separation of magnetite, weakly magnetic iron ore and surrounding rock in the symbiotic refractory iron ore is realized, and conditions are created for improving the productivity and reducing the cost of the next process.
Example 3
The symbiotic refractory iron ore is derived from four channel iron ores in Gansu province, the iron grade is 31 percent, wherein 15 percent of magnetite, 65 percent of weak magnetic iron ore and 20 percent of surrounding rock are mixed, and the iron ore is treated according to the following steps:
A. crushing the symbiotic refractory iron ore to 0-50mm, and screening to obtain two size fractions of 0-10mm and 10-50mm, wherein the symbiotic refractory mineral separation yield of 0-10mm size fraction is 40%, and the content of magnetite is 6%, the content of weakly magnetic iron ore is 26%, and the content of surrounding rock is 8%; the yield of 10-50mm size grade symbiotic refractory ore dressing is 60%, the yield of magnetite ore is 9%, the yield of weak magnetic iron ore is 39%, and the yield of surrounding rock is 12%.
B. Pre-selecting and separating 10-50mm size grade symbiotic refractory iron ore by using a field intensity 2200 Oe magnetic pulley to obtain indexes of 14.8% of magnetite operation yield, 8.8% of raw ore yield, 85.2% of weak magnetic iron ore and surrounding rock operation yield and 51.2% of raw ore yield; and then separating weak magnetic iron ore with the size fraction of 10-50mm from surrounding rock by using an X-ray transmission intelligent preselector to obtain indexes of 75.6% of the operation yield of the weak magnetic iron ore, 38.71% of the yield of raw ore, 24.4% of the operation yield of the surrounding rock, 12.49% of the yield of the raw ore and 94% of the selection rate of the surrounding rock.
C. The separation and preselection operation of magnetite, weakly magnetic iron ore and surrounding rock is carried out on 0-10mm size grade symbiotic refractory iron ore by adopting a spiral dry magnetic separator with the field intensity of 2500 Oe, and indexes of 14.8% of magnetite operation yield, 5.92% of raw ore yield, 85.2% of weakly magnetic iron ore and surrounding rock operation yield and 34.08% of raw ore yield are obtained.
D. And then separating the weak magnetic iron ore with the size fraction of 0-10mm from the surrounding rock by adopting a field intensity 8500Oe spiral dry magnetic separator to obtain indexes of 78.4% of the operation yield of the weak magnetic iron ore, 26.72% of the raw ore, 21.6% of the operation yield of the surrounding rock, 7.36% of the raw ore and 95% of the surrounding rock separation rate.
E. Through the preselection separation of different equipment, effective separation of magnetite, weakly magnetic iron ore and surrounding rock is realized, the indexes of 14.72 percent of magnetite yield, 65.43 percent of weakly magnetic iron ore yield and 19.85 percent of surrounding rock yield are obtained, the effective separation of the magnetite, the weakly magnetic iron ore and the surrounding rock in the symbiotic refractory iron ore is realized, and conditions are created for improving the productivity and reducing the cost of the next process.
Claims (2)
1. A combined pre-selection waste-throwing process for complex symbiotic refractory iron ores is characterized by comprising the following steps:
1) crushing symbiotic refractory iron ores to 0-50mm, and screening into two size fractions of 0-10mm and 10-50 mm;
2) pre-separating the 10-50mm size fraction symbiotic refractory iron ore in the step 1) by adopting a magnetic pulley with the field intensity of 1800-2200 Oe, wherein the pre-separated concentrate is magnetite, and the pre-separated tailings are weakly magnetic iron ore and surrounding rock;
3) separating the 10-50mm size fraction weak magnetic iron ore and the surrounding rock in the step 2) by adopting an X-ray transmission intelligent preselector, wherein the preselection concentrate is the weak magnetic iron ore, and the preselection tailings are the surrounding rock;
4) carrying out separation and preselection operation on magnetite, weakly magnetic iron ore and surrounding rock on the 0-10mm size fraction symbiotic refractory iron ore in the step 1) by adopting a spiral dry magnetic separator with the field intensity of 2200-;
5) and then, carrying out separation and preselection operation on the low-magnetic iron ore and the surrounding rock on the 0-10mm size fraction preselection tailings in the step 4) by adopting a spiral dry magnetic separator with the field intensity of 8000-8500 Oe, wherein the preselection concentrate is the low-magnetic iron ore, and the preselection tailings are the surrounding rock.
2. The combined pre-selection waste-throwing process of the complex symbiotic refractory iron ore according to claim 1, which is characterized in that: the symbiotic refractory iron ore in the step 1) comprises magnetite, weakly magnetic iron ore and surrounding rock; the weakly magnetic iron ore in the step 2) comprises hematite, limonite and siderite.
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Application publication date: 20200211 |
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