CN112474036B - Method and equipment for removing phosphorus from rutile concentrate - Google Patents
Method and equipment for removing phosphorus from rutile concentrate Download PDFInfo
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- CN112474036B CN112474036B CN202011195569.XA CN202011195569A CN112474036B CN 112474036 B CN112474036 B CN 112474036B CN 202011195569 A CN202011195569 A CN 202011195569A CN 112474036 B CN112474036 B CN 112474036B
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
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- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
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- B—PERFORMING OPERATIONS; TRANSPORTING
- 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
- B03C1/005—Pretreatment specially adapted for magnetic separation
- B03C1/015—Pretreatment specially adapted for magnetic separation by chemical treatment imparting magnetic properties to the material to be separated, e.g. roasting, reduction, oxidation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- 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
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- B03C1/02—Magnetic separation acting directly on the substance being separated
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Abstract
A rutile concentrate dephosphorization method comprises the following steps: roasting the rough rutile concentrate at the temperature of 800-850 ℃; cooling the roasted rough rutile concentrate; carrying out first magnetic separation on the cooled rough rutile concentrate, wherein the magnetic field intensity of the first magnetic separation is 7000-8000 GS; and carrying out second magnetic separation on the rutile concentrate subjected to the first magnetic separation to obtain high-grade rutile concentrate, wherein the magnetic field intensity of the second magnetic separation is more than 11000 GS. As phosphorus impurities are mainly associated in the iron oxide of the rough rutile concentrate, the iron oxide with poor magnetic conductivity is reacted to form the iron oxide with better magnetic conductivity by roasting the rough rutile concentrate at the temperature of 800-850 ℃. At the moment, removing the iron oxide by magnetic separation, and correspondingly removing phosphorus impurities associated with the iron oxide. The invention also provides a rutile concentrate dephosphorization device.
Description
Technical Field
The invention relates to the technical field of rutile beneficiation, in particular to a phosphorus removal method and phosphorus removal equipment for rutile concentrate.
Background
The prior natural rutile concentrate has high phosphorus content, which affects the use of products in the production of high-grade welding rods and welding wires. In order to reduce the content of phosphorus impurities in rutile concentrate, a flotation method is commonly adopted to remove the phosphorus impurities at present. In the solution with the pH value of 8-9, sodium carbonate and water glass are used as regulators, kerosene and soap are used as collectors for reverse flotation, and phosphorus impurities are floated, so that the concentrate grade of the natural rutile is improved. However, the removal of phosphorus impurities by flotation has the following problems: A. before flotation, grinding treatment is needed to destroy the granularity of ore; B. the used flotation agent has large dosage, multiple types, high cost, water pollution and other environmental problems; C. after flotation, the viscosity of ore particles is increased, and the post-treatment and the recovery are difficult.
Disclosure of Invention
The invention mainly aims to provide a phosphorus removal method for rutile concentrates, and aims to solve the problems of high cost, low efficiency and easy environmental pollution of the prior art for removing phosphorus impurities in rutile concentrates by adopting a flotation method.
The embodiment of the invention provides a phosphorus removal method for rutile concentrate, which comprises the following steps:
roasting the rutile concentrate at the temperature of 800-850 ℃;
cooling the roasted rutile concentrate;
carrying out first magnetic separation on the cooled rutile concentrate, wherein the magnetic field intensity of the first magnetic separation is 7000-8000 GS; and
and carrying out second magnetic separation on the rutile concentrate subjected to the first magnetic separation to obtain high-grade rutile concentrate, wherein the magnetic field intensity of the second magnetic separation is more than 11000 GS.
Optionally, before the second magnetic separation, an electric separation step is further included:
carrying out electric separation on the rutile concentrate subjected to the first magnetic separation;
and then carrying out magnetic separation on the rutile concentrate subjected to the electric separation for the second time.
Optionally, the duration of the firing step is 1.5-2 hours.
Optionally, the high-grade rutile concentrate has a phosphorus content of 0.036%.
Optionally, the voltage used in the electrically selecting step is 2-3 ten thousand volts.
Optionally, the electrically sorting step is four.
The embodiment of the invention also provides a rutile concentrate dephosphorization device, which comprises:
the roasting kiln is used for roasting the rutile concentrate at the temperature of 800-850 ℃;
the cooling cylinder is used for cooling the roasted rutile concentrate;
the low-intensity magnetic separator is used for carrying out primary magnetic separation on the cooled rutile concentrate, and the magnetic field intensity of the primary magnetic separation is 7000-8000 GS; and
and the strong magnetic separator is used for carrying out secondary magnetic separation on the rutile concentrate subjected to the primary magnetic separation so as to obtain high-grade rutile concentrate, and the magnetic field intensity of the secondary magnetic separation is more than 11000 GS.
Optionally, the rutile concentrate dephosphorization equipment further comprises an electric separator, which is arranged between the weak magnetic separator and the strong magnetic separator and used for electrically separating and separating the rutile concentrate subjected to the first magnetic separation.
Optionally, the cooling cylinder further comprises a spraying device and a water receiving tank, the spraying device is used for cooling the cooling cylinder by spraying water, and the water receiving tank is arranged below the cooling cylinder and used for collecting the spraying water.
Optionally, the rutile concentrate phosphorus removal equipment further comprises:
a first elevator for conveying rutile concentrate to the roasting kiln;
the second hoisting machine is used for conveying the cooled rutile concentrate to the low-intensity magnetic separator;
and the third hoister is used for conveying the rutile concentrate subjected to the first magnetic separation to the strong magnetic separator.
Because phosphorus impurities are mainly associated in iron oxides of rutile concentrate, in the method and the equipment for removing phosphorus from rutile concentrate provided by the embodiment of the invention, the rutile concentrate is roasted at the temperature of 800-850 ℃. The internal structure of the roasted rutile concentrate changes. The iron oxide with poor magnetic conductivity or non-magnetic conductivity is reacted or altered to form the iron oxide with better magnetic conductivity. Therefore, the removal of the iron oxide by magnetic separation can correspondingly remove the phosphorus impurities associated with the iron oxide.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic flow chart of a rutile concentrate phosphorus removal method provided by an embodiment of the invention.
Fig. 2 is a schematic flow diagram of the table sorting of raw ore to obtain the rutile concentrate of fig. 1.
Fig. 3 is a schematic flow diagram of a specific process of the rutile concentrate phosphorus removal method in fig. 1.
Fig. 4 is a schematic flow diagram of the electro-beneficiation of the rutile concentrate of fig. 3.
Fig. 5 is a schematic overall flow diagram of the rutile concentrate phosphorus removal method in fig. 2-4.
Fig. 6 is a schematic structural diagram of a rutile concentrate phosphorus removal apparatus provided in an embodiment of the present invention.
Fig. 7 is a schematic structural diagram of the rutile concentrate phosphorus removal equipment in fig. 6 with an additional electric separator.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture, and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In addition, if the meaning of "and/or" and/or "appears throughout, the meaning includes three parallel schemes, for example," A and/or B "includes scheme A, or scheme B, or a scheme satisfying both schemes A and B. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
Referring to fig. 1, an embodiment of the present invention provides a method for removing phosphorus from rutile concentrate, including the following steps:
the rutile concentrate is roasted at 800-850 ℃. In this example, the duration of the calcination step is 1.5 to 2 hours.
And cooling the roasted rutile concentrate. Specifically, the roasted rutile concentrate is cooled to below 60 ℃.
Carrying out first magnetic separation on the cooled rutile concentrate, wherein the magnetic field intensity of the first magnetic separation is 7000-8000 GS; and
and carrying out second magnetic separation on the rutile concentrate subjected to the first magnetic separation to obtain high-grade rutile concentrate, wherein the magnetic field intensity of the second magnetic separation is more than 11000 GS.
Since phosphorus impurities are mainly associated in the iron oxides of the rutile concentrate, in the above-mentioned rutile concentrate phosphorus removal method, the rutile concentrate is roasted at the temperature of 800-850 ℃. The internal structure of the roasted rutile concentrate changes. The iron oxide with poor magnetic conductivity or non-magnetic conductivity is reacted or altered to form the iron oxide with better magnetic conductivity. Therefore, the removal of the iron oxide by magnetic separation can correspondingly remove the phosphorus impurities associated with the iron oxide. Specifically, through the steps of roasting, primary magnetic separation and secondary magnetic separation, the phosphorus content of the obtained high-grade rutile concentrate is 0.036%.
According to the requirement, before the second magnetic separation, the method also comprises an electric separation step:
performing electric separation on the rutile concentrate subjected to the first magnetic separation;
and then carrying out magnetic separation on the rutile concentrate subjected to the electric separation for the second time.
Through the step of electric separation, the rutile concentrate after the first magnetic separation can be separated into conductive rutile concentrate and non-conductive tailings, so that the phosphorus impurity content in the rutile concentrate is further removed.
The voltage used in the electrical selection step is 2-3 ten thousand volts as required. It is understood that, in the present embodiment, the electrical sorting step is four.
The rutile sand raw ore may be subjected to table separation by a table concentrator before roasting the rutile concentrate, as required, to decompose the rutile sand raw ore into rutile concentrate, zircon sand concentrate and tailings.
The following describes specific steps of the rutile concentrate phosphorus removal method provided by the embodiment of the invention in a specific embodiment.
Obtaining rutile raw ore, wherein the element components of the rutile raw ore are shown in the table 1.
TABLE 1 results of elemental analysis in raw ore
| Element(s) | TiO 2 | Zr(Hf)O 2 | P | S |
| Content (%) | 15.22 | 33.14 | 0.38 | 0.50 |
Referring to fig. 2, rutile raw ore is separated by a table concentrator, most of tailings and other impurities are removed, and rutile rough concentrate and zirconite rough concentrate are obtained. The grades and the operating recovery rates of the components of the raw rutile after the separation by the shaker are shown in table 2. The test result shows that: selecting via shaking table to obtain TiO-containing material 2 54.98% and 95.34% recovery rate.
TABLE 2 Table separation results on a shaking table
Referring to fig. 3, the rough concentrate of rutile obtained by sorting with a shaker is dehydrated and dried, and then the corresponding rough concentrate of rutile is roasted. The roasting temperature is 800-850 ℃, and the roasting duration is 1.5-2 h. And carrying out a magnetic separation test on the roasted rough rutile concentrate by using a dry magnetic separator. Separating ilmenite from the rough rutile concentrate by low-intensity magnetic separation, and separating magnetic-conductive rutile concentrate from the rough rutile concentrate by high-intensity magnetic separation. Wherein the magnetic field intensity used for the low-intensity magnetic separation is 7000-8000 GS. The magnetic field intensity used by the strong magnetic separation is 11000GS or more. The results of the magnetic separation are shown in Table 3.
TABLE 3 magnetic separation test results
Referring to fig. 4, the magnetically conductive rutile concentrate after magnetic separation may be subjected to electric separation as needed. Obtaining the product containing 0.19 percent of P and TiO by magnetic separation 2 And (3) carrying out concentration on 61.97% of magnetic-conductive rutile concentrate by adopting an electric separation process. The results of the electroselection are shown in table 4.
TABLE 4 results of magnetic rutile concentrate electric separation test
As can be seen from Table 4, TiO was obtained by electrowinning 2 、Zr(Hf)O 2 The P content is respectively 80.85%, 0.50% and 0.036%, and the operation recovery rate is respectively 98.23%, 33.30% and 15.47%.
Fig. 5 is a schematic overall flow diagram of the rutile concentrate phosphorus removal method in fig. 2-4. Table 5 shows the test results of the entire procedure. As can be seen from Table 5, TiO can be obtained by the full-scale experiment 2 Content 80.91%, recovery 22.10%, Zr (Hf) O 2 P is 0.82% and 0.036% magnetically permeable rutile concentrate, respectively. Meets the requirement of the magnetic conduction rutile concentrate sales quality index.
TABLE 5 full flow test results
The embodiment of the invention also provides a rutile concentrate dephosphorization device 100, which comprises:
the roasting kiln 110 is used for roasting the rutile concentrate at the temperature of 800-850 ℃;
a cooling drum 120 for cooling the roasted rutile concentrate;
the low-intensity magnetic separator 130 is used for carrying out first magnetic separation on the cooled rutile concentrate, and the magnetic field intensity of the first magnetic separation is 7000-8000 GS; and
and the strong magnetic separator 140 is used for carrying out second magnetic separation on the rutile concentrate subjected to the first magnetic separation so as to obtain high-grade rutile concentrate, and the magnetic field intensity of the second magnetic separation is more than 11000 GS.
The rutile concentrate phosphorus removal apparatus 100 also includes an electric separator 150, as desired. The electric separator 150 is arranged between the low-intensity magnetic separator 130 and the high-intensity magnetic separator 140, and is used for performing electric separation on the rutile concentrate subjected to the first magnetic separation.
The cooling cylinder 120 further includes a spraying device (not shown) and a water receiving tank 160, as required. The spraying equipment is used for cooling the cooling cylinder 120 by spraying water. The water receiving tank 160 is disposed below the cooling cylinder 120 to collect shower water. And after the water receiving tank 160 collects shower water, the shower water is discharged outside and cooled and then recycled.
The rutile concentrate phosphorus removal apparatus 100 further includes, as needed:
a first elevator 171 for conveying rutile concentrate to the roasting kiln 110;
a second hoisting machine 172 for transporting the cooled rutile concentrate to the low intensity magnetic separator 130;
and a third hoisting machine 173 for conveying the rutile concentrate subjected to the first magnetic separation to the strong magnetic separator 140.
The number of the electric separators 150 is four, as required. The rutile concentrate phosphorus removal apparatus 100 further includes a fourth elevator 174, a fifth elevator 175, a sixth elevator 176, and a seventh elevator 177. The fourth elevator 174, the fifth elevator 175, the sixth elevator 176 and the seventh elevator 177 are used to deliver the rutile concentrate to each electroclassifier 150.
Each of the elevators 171-177 is provided with a storage hopper for receiving the processed material of the previous process, as required.
The equipment 100 for removing phosphorus from rough rutile concentrate provided by the embodiment comprises a roasting kiln 110, a cooling cylinder 120, a low-intensity magnetic separator 130, an electric separator 150, a high-intensity magnetic separator 140 and the like. When the storage hopper discharging device is started, the discharging valve of the storage hopper can be opened, and the natural rutile rough concentrate falls onto the lifter 171 through the discharging opening and then falls to the tail of the roasting kiln 110 after being lifted to a certain height. Is conveyed forward by the rotation of the roasting kiln 110. In this embodiment, the roasting kiln 110 forms a certain inclination angle with the ground. Thus, the rutile concentrate may move from the tail to the head of the roasting kiln 110 while the roasting kiln 110 is rotating. The kiln head of the roasting kiln 110 is provided with a natural gas jet ignition device 111, and flame directly acts on the surface of the placer. In a high-temperature and high-pressure flue gas environment, the internal structure of the magnetic conductive natural rutile concentrate is changed, and iron oxide with poor magnetic conductivity and no magnetic conductivity is reacted and altered to form iron oxide with better magnetic conductivity. After a certain time of high temperature roasting, the rutile concentrate is discharged from the kiln head end and falls into the closed cooling cylinder 120. The surface of the cooling cylinder 120 is cooled by spray water, and a water receiving tank 160 is arranged outside the cooling cylinder 120. The cooled rutile concentrate falls onto the elevator 172 and is lifted to the low intensity magnetic separator 130 for the first magnetic separation. The non-magnetic materials are lifted to a 4-channel electric separator 150 for electric separation and quality improvement through a lifting machine 174 and 177, then are separated again and quality improvement through a strong magnetic separator 140, and finally the obtained non-magnetic materials are mixed and packaged to obtain finished products. A dust removing device 112 is further provided at the tail of the roasting kiln 110 as required. Flue gas from the calcination process may be treated with a dust removal device 112.
Namely, the rutile rough concentrate dephosphorization equipment provided by the embodiment of the invention utilizes equipment such as a roasting kiln, a cooling cylinder, a magnetic separator, an electric separator and the like to realize the dephosphorization and quality improvement, can realize continuous flow hydration operation, simplifies the production process, and the flue gas generated in the process is convenient to collect and treat by utilizing the dust removal equipment 112. The cooling water can be recycled after being collected by the water receiving tank 160 and naturally cooled, and the temperature distribution is easy to control, so that the stable product quality is ensured.
The equipment for removing phosphorus from rough rutile concentrate provided by the embodiment has the following beneficial effects:
by utilizing a high-temperature roasting means, the alteration separation of part of the iron oxide and the rutile is accelerated, and the magnetic conductivity of the magnetic conductive natural rutile is improved.
The natural gas combustion is utilized to provide a heat source, and the traditional coal and heavy oil heat supply mode is not adopted, so that the environment is more environment-friendly, and the automation control is easier.
And (3) cooling the roasted ore sand by using a spray device arranged outside the closed cooling cylinder, directly collecting spray water by using a water receiving tank arranged below, and discharging and cooling the spray water for recycling.
Roasting and cooling the natural rutile, and removing iron and phosphorus by using two processes of weak magnetic separation and strong magnetic separation to separate phosphorus impurities associated in the iron oxide.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A phosphorus removal method for rutile concentrate is used for removing phosphorus impurities in iron oxides associated with the interior of rutile rough concentrate, and is characterized by comprising the following steps:
roasting the rough rutile concentrate at the temperature of 800-850 ℃ so as to enable iron oxide in the rough rutile concentrate to react or change and form iron oxide with better magnetic permeability;
cooling the roasted rough rutile concentrate;
carrying out first magnetic separation on the cooled rough rutile concentrate, wherein the magnetic field intensity of the first magnetic separation is 7000-8000 GS; and
carrying out second magnetic separation on the rutile concentrate subjected to the first magnetic separation to obtain high-grade rutile concentrate, wherein the magnetic field intensity of the second magnetic separation is more than 11000 GS;
the first magnetic separation and the second magnetic separation are used for separating phosphorus impurities accompanied with the iron oxides from the rutile rough concentrate.
2. The method for removing phosphorus from rutile concentrate of claim 1, wherein the step of electrically separating before the second magnetic separation further comprises:
carrying out electric separation on the rutile concentrate subjected to the first magnetic separation;
and then carrying out magnetic separation on the rutile concentrate subjected to the electric separation for the second time.
3. The method for removing phosphorus from rutile concentrate of claim 1, wherein the duration of the roasting step is 1.5-2 hours.
4. The method for removing phosphorus from rutile concentrate of claim 1, wherein the phosphorus content of the high-grade rutile concentrate is 0.036%.
5. The method for removing phosphorus from rutile concentrate of claim 2, wherein the voltage used in the electro-flotation step is between 2 and 3 kilovolts.
6. The method for removing phosphorus from rutile concentrate of claim 5, wherein the electro-concentration step is four.
7. A rutile concentrate phosphorus removal device for removing phosphorus impurities in iron oxides associated with rutile rough concentrate is characterized by comprising:
the roasting kiln is used for roasting the rough rutile concentrate at the temperature of 800-850 ℃ so as to enable iron oxide in the rough rutile concentrate to react or alter and form iron oxide with better magnetic permeability;
the cooling cylinder is used for cooling the roasted rutile rough concentrate;
the low-intensity magnetic separator is used for carrying out primary magnetic separation on the cooled rough rutile concentrate, and the magnetic field intensity of the primary magnetic separation is 7000-8000 GS; and
the strong magnetic separator is used for carrying out second magnetic separation on the rutile concentrate subjected to the first magnetic separation so as to obtain high-grade rutile concentrate, and the magnetic field intensity of the second magnetic separation is more than 11000 GS;
the first magnetic separation and the second magnetic separation are used for separating phosphorus impurities accompanied with the iron oxides from the rutile rough concentrate.
8. The rutile concentrate phosphorus removal equipment of claim 7, further comprising an electric separator, disposed between the weak magnetic separator and the strong magnetic separator, for electrically separating the rutile concentrate after the first magnetic separation.
9. The rutile concentrate phosphorus removal equipment of claim 7, wherein the cooling cylinder further comprises a spraying device and a water receiving tank, the spraying device is used for cooling the cooling cylinder by spraying water, and the water receiving tank is arranged below the cooling cylinder and is used for collecting the spraying water.
10. The rutile concentrate phosphorus removal apparatus of claim 7, further comprising:
the first hoister is used for conveying the rough rutile concentrate to the roasting kiln;
the second hoisting machine is used for conveying the cooled rough rutile concentrate to the low-intensity magnetic separator;
and the third elevator is used for conveying the rutile concentrate subjected to the first magnetic separation to the strong magnetic separator.
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