CN114798159A - Ore grading process - Google Patents
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- CN114798159A CN114798159A CN202210462837.2A CN202210462837A CN114798159A CN 114798159 A CN114798159 A CN 114798159A CN 202210462837 A CN202210462837 A CN 202210462837A CN 114798159 A CN114798159 A CN 114798159A
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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
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Abstract
The invention discloses an ore grading process, wherein after ore grinding of magnetic separation rough concentrates through a moxa sand mill, products are fed into a high-frequency fine sieve, the minerals on the sieve return to the mill in a closed circuit, the minerals under the sieve enter a magnetic washing separator for grading, and the concentrate is washed through pottery and subjected to reverse flotation operation. According to the invention, the contents of silicon, potassium and sodium in the concentrate are effectively reduced through the ceramic washing operation, the content of fluorine element in the concentrate is effectively reduced through the flotation operation, the iron concentrate grade is improved, the content of impurity element in the iron concentrate is reduced, and meanwhile, the tailing grade is reduced, and the metal loss is reduced.
Description
Technical Field
The invention relates to the technical field of ore dressing, in particular to an ore dressing process.
Background
The 'poor, fine and impurity' is the main characteristic of iron ore in China, the world average iron grade is about 44%, the iron grade in China is only about 33%, the difficulty in separation is high, particularly for weak-magnetic iron ore, the ore has very strong magnetic and non-magnetic particle inclusion, the composition of the intergrowth consisting of magnetite and gangue is complex, and high-grade concentrate cannot be obtained by a simple magnetic separation method.
The contents of silicon, potassium, sodium and fluorine elements in the iron ore concentrate exceed the standard, so that the slag-iron ratio of blast furnace ironmaking is difficult to reduce, the blast furnace is nodulated, the environment is polluted, and the cost is increased. The method has the advantages of effectively improving the grade of the iron ore concentrate, reducing the content of silicon, potassium and sodium impurity elements, providing high-quality raw materials for downstream smelting processes, reducing the frequency of adjusting the proportion of the iron materials in smelting, reducing the nodulation rate of the blast furnace, prolonging the service cycle of a furnace lining, stabilizing the sintering quality, stabilizing the production operation of the blast furnace and reducing the smelting cost, and has great significance.
In recent years, a 'four-reduction two-improvement' project is actively and correspondingly performed, the cost of iron ore concentrate is reduced, energy is saved, consumption is reduced, new medicaments, new equipment and new processes are introduced, new technologies suitable for improving the quality, reducing impurities, reducing cost and improving efficiency of different types of iron ores are explored, and remarkable effects are achieved.
Chinese patent application No. 201810685599.5 discloses a process for improving quality and reducing impurities of lean magnetite ore, wherein the grade of iron concentrate is improved to 66-68%, and the operation recovery rate (for rough concentrate) of iron is not less than 98%. The content of potassium, sodium and fluorine elements in iron ore concentrate is not specified, and the content of the impurity elements is important for blast furnace smelting.
Disclosure of Invention
Aiming at the problem of high content of silicon, potassium, sodium and fluorine elements in concentrate of low-grade iron ore in the existing production situation, the invention aims to provide an ore sorting process. The content of silicon, potassium and sodium in the concentrate is effectively reduced through the ceramic washing operation, the content of fluorine elements in the concentrate is effectively reduced through the flotation operation, the iron concentrate grade is improved, the content of impurity elements in the iron concentrate is reduced, and meanwhile, the metal loss is reduced through the reduction of the tailing grade.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention relates to an ore sorting process, which comprises the following steps: the method comprises the following steps:
step one, crushing: crushing the iron ore, wherein the grade of the raw iron ore is 24-26%, and the content of magnetic iron in the ore is 65-70%, and performing three-stage one-closed-circuit crushing to-12 mm;
step two, ore grinding and magnetic separation: grinding and grading by a two-section closed-circuit wet overflow ball mill, wherein the grinding fineness of 0.074mm accounts for 88-90%, and performing low-intensity magnetic separation on a graded overflow product;
step three, grinding and screening: feeding the magnetic separation rough concentrate into a three-section moxa mill for grinding and grading, wherein the grinding fineness of-0.037 mm accounts for more than 96%, feeding a grading overflow product into a high-frequency fine sieve for fine sieve screening, and returning the product on the sieve to a three-section mill grinding and grading system in a closed circuit;
step four, washing and selecting: feeding the undersize product into an elutriation machine for fine separation;
step five, flotation: according to the requirement of downstream smelting on the fluorine content, the ceramic washing concentrate product is subjected to flotation operation, an inhibitor and an iron reverse flotation collector are added, the flotation temperature is 30 ℃, and the fluorine content is further reduced through the reverse flotation operation; finally obtaining flotation concentrate.
Further, in the second step, the secondary grinding graded overflow product is subjected to a primary low-intensity magnetic separation process to obtain primary low-intensity magnetic separation rough concentrate, and tailings are thrown out.
And further, carrying out two-stage low-intensity magnetic separation on the first-stage low-intensity magnetic separation concentrate, and throwing out tailings. .
Further, the magnetic field intensity of the first-stage low-intensity magnetic separation process is 1800 oersted, and the magnetic field intensity of the second-stage low-intensity magnetic separation process is 1600 oersted.
Furthermore, the magnetic field intensity, the fixed magnetic field intensity and the circulating magnetic field intensity of the ceramic washing magnetic separator are 1800 oersted, and the compensating magnetic field intensity is 1100 oersted.
Furthermore, washing water of the elutriation machine is circulating water of a concentrating mill, and the washing water amount is 5-7m 3 And feeding ore per ton.
Furthermore, the mesh of the fine sieve is 0.074 mm.
Compared with the prior art, the invention has the beneficial technical effects that:
the iron ore sorting process improves the grade of iron ore concentrate, reduces the content of silicon, potassium, sodium and fluorine impurities in the iron ore concentrate, is beneficial to providing high-quality raw materials for downstream smelting processes, reduces the frequency of adjusting the proportion of iron materials during smelting, reduces the nodulation rate of a blast furnace, prolongs the service cycle of a furnace lining, stabilizes the sintering quality, stabilizes the production operation of the blast furnace and reduces the smelting cost.
Compared with the original process flow, the iron ore sorting process has the advantages that the grinding fineness is improved through the moxa sand grinding, the ceramic washing operation is increased, the flotation feeding load is reduced, half of the operation of flotation equipment is reduced, the flotation steam consumption and the medicament consumption are reduced, the power consumption is reduced, the process flow is simple, and the green mine can be constructed.
Drawings
The invention is further illustrated in the following description with reference to the drawings.
FIG. 1 is a flow chart of the ore dressing process of the present invention.
Detailed Description
For a further understanding of the present invention, reference is made to FIG. 1 for a detailed description of the invention.
Example 1
The iron ore sorting process of the embodiment comprises the following steps:
the method comprises the following steps: crushing: the low-grade iron ore, the raw ore grade of the iron ore is 24% -26%, and the content of magnetic iron in the ore is 65% -70%, is crushed into-12 mm (namely the granularity less than 12 mm) in a three-section and one-closed circuit.
Step two, ore grinding and magnetic separation: and then two-section closed-circuit wet-type overflow ball mill grinding-classification is carried out, the grinding fineness of-0.074 mm accounts for 88% -90%, and the classified overflow product is subjected to low-intensity magnetic separation, and the grade of the low-intensity magnetic separation iron is 56.5% -58.5%.
Step three, grinding and screening: feeding the magnetic separation rough concentrate into three sections of moxa sand grinding and grading, wherein the grinding fineness is-0.037 mm and accounts for more than 96%, feeding the graded overflow product into a high-frequency fine sieve for sieving, the sieve pore of the fine sieve is 0.074mm, and returning the product on the sieve to a three-section mill grinding and grading system in a closed circuit.
Step four, washing and selecting: the product under the fine screen is fed into an elutriator for concentration, wherein the elutriator concentrates the iron grade of 65.83%, the fluorine content of 0.649%, the silicon content of 1.945%, the potassium content of 0.052% and the sodium content of 0.124%. The grade of the iron in the tailings is 16.33 percent.
Step five, flotation: according to the requirement of downstream smelting on the fluorine element content, the ceramic washing concentrate product is subjected to flotation operation, an inhibitor and an iron reverse flotation collector are added, the flotation temperature is 30 ℃, the fluorine element content is further reduced through the reverse flotation operation, the iron grade of the flotation concentrate is 66.81%, the fluorine content is 0.425%, the silicon content is 2.413%, the potassium content is 0.074%, and the sodium content is 0.127%. The grade of the iron in the tailings is 22.62 percent.
The further technical proposal is that the method adopts a technical proposal that,
and in the second step, the secondary grinding graded overflow product is subjected to a primary low-intensity magnetic separation (1800 oersted) process to obtain primary low-intensity magnetic separation rough concentrate, and tailings are thrown out.
And (4) carrying out second-stage low-intensity magnetic separation (1600 oersted) on the first-stage low-intensity magnetic concentrate, and throwing out tailings.
The further technical scheme is that the magnetic field intensity of the ceramic washing magnetic separator, the fixed magnetic field intensity and the circulating magnetic field intensity are 1800 oersted, the compensation magnetic field intensity is 1100 oersted, the washing water of the elutriation machine is the circulating water of a dressing plant, and the washing water volume is 5-7m 3 And feeding ore per ton.
Example 2
The iron ore sorting process of the embodiment comprises the following steps:
the method comprises the following steps: crushing: the low-grade iron ore, the raw ore grade of the iron ore is 22 percent, and the content of the magnetic iron in the ore is 58 to 60 percent, is subjected to three-stage one-closed-circuit crushing to be-12 mm (namely, the granularity is less than 12 mm).
Step two, ore grinding and magnetic separation: and then two-section closed-circuit wet-type overflow ball mill grinding-classification is carried out, the grinding fineness of-0.074 mm accounts for 90% -93%, and the classified overflow product is subjected to low intensity magnetic separation, wherein the grade of iron is 54.5% -55.5%.
Step three, grinding and screening: feeding the magnetic separation rough concentrate into a three-section moxa sand grinding-classification system, wherein the grinding fineness is-0.025 mm and accounts for more than 95%, feeding a classification overflow product into a high-frequency fine sieve for sieving, the sieve pore of the fine sieve is 0.074mm, and returning the product on the sieve to the three-section grinding-classification system in a closed circuit.
Step four, washing and selecting: the undersize product is fed into an elutriator for concentration, and the elutriator concentrates the iron grade to be 63.83%, the fluorine content to be 1.079%, the silicon content to be 1.93%, the potassium content to be 0.08% and the sodium content to be 0.128%. The grade of the iron in the tailings is 14.94 percent.
Step five, flotation: according to the requirement of downstream smelting on the fluorine content, the ceramic washing concentrate product is subjected to flotation operation, an inhibitor and an iron reverse flotation collector are added, the flotation temperature is 30 ℃, the fluorine content is further reduced through the reverse flotation operation, and the flotation concentrate has 67.07% of iron grade, 0.385% of fluorine content, 1.98% of silicon content, 0.067% of potassium content and 0.105% of sodium content. The grade of the iron in the tailings is 26.58 percent.
The further technical proposal is that the method adopts a technical proposal that,
and in the second step, the secondary grinding graded overflow product is subjected to a primary low-intensity magnetic separation (1800 oersted) process to obtain primary low-intensity magnetic separation rough concentrate, and tailings are thrown out.
And (4) carrying out secondary low-intensity magnetic separation (1600 oersted) on the first-stage low-intensity magnetic concentrate, and throwing out tailings.
The further technical scheme is that the magnetic field intensity of the ceramic washing magnetic separator, the fixed magnetic field intensity and the circulating magnetic field intensity are 1800 oersted, the compensation magnetic field intensity is 1100 oersted, the washing water of the elutriation machine is the circulating water of a dressing plant, and the washing water volume is 5-7m 3 And feeding ore per ton.
Example 3
The iron ore sorting process of the embodiment comprises the following steps:
the method comprises the following steps: crushing: the low-grade iron ore, the raw ore grade of the iron ore is 27-28 percent, and the content of the magnetic iron in the ore is 75-80 percent, and the low-grade iron ore is crushed to-12 mm (namely the granularity is less than 12 mm) in a three-section one-closed circuit.
Step two, ore grinding and magnetic separation: and then two-section closed-circuit wet-type overflow ball mill grinding-classification is carried out, the grinding fineness of 0.074mm accounts for 88% -90%, and the classified overflow product is subjected to low intensity magnetic separation, wherein the grade of iron is 57% -58%.
Step three, grinding and screening: feeding the magnetic separation rough concentrate into a three-section moxa mill for grinding and grading, wherein the grinding fineness is-0.048 mm and accounts for more than 85%, feeding a grading overflow product into a high-frequency fine sieve for sieving, wherein the sieve pore of the fine sieve is 0.074mm, and returning the product on the sieve to a three-section mill grinding and grading system in a closed circuit.
Step four, washing and selecting: the product under the fine screen is fed into an elutriator for selection, wherein the elutriator selects 666.20% of iron grade, 0.990% of fluorine content, 2.139% of silicon content, 0.067% of potassium content and 0.184% of sodium content. The grade of the iron in the tailings is 20.55 percent.
Step five, flotation: according to the requirement of downstream smelting on the fluorine content, the ceramic washing concentrate product is subjected to flotation operation, an inhibitor and an iron reverse flotation collector are added, the flotation temperature is 30 ℃, the fluorine content is further reduced through the reverse flotation operation, and the flotation concentrate has 68.5% of iron grade, 0.234% of fluorine content, 2.051% of silicon content, 0.062% of potassium content and 0.199% of sodium content. The grade of the iron in the tailings is 35.53 percent.
The further technical proposal is that the method adopts a technical proposal that,
and in the second step, the secondary grinding graded overflow product is subjected to a primary low-intensity magnetic separation (1800 oersted) process to obtain primary low-intensity magnetic separation rough concentrate, and tailings are thrown out.
And (4) carrying out secondary low-intensity magnetic separation (1600 oersted) on the first-stage low-intensity magnetic concentrate, and throwing out tailings.
The further technical scheme is that the magnetic field intensity of the ceramic washing magnetic separator, the fixed magnetic field intensity and the circulating magnetic field intensity are 1800 oersted, the compensation magnetic field intensity is 1100 oersted, the washing water of the elutriation machine is the circulating water of a dressing plant, and the washing water volume is 5-7m 3 And feeding ore per ton.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (7)
1. An ore grading process is characterized by comprising the following steps:
step one, crushing: crushing the iron ore, wherein the grade of the raw iron ore is 24-26%, and the content of magnetic iron in the ore is 65-70%, and performing three-stage one-closed-circuit crushing to-12 mm;
step two, ore grinding and magnetic separation: then two-section closed wet overflow ball mill grinding-grading is carried out, the grinding fineness of-0.074 mm accounts for 88% -90%, and the graded overflow product is subjected to low intensity magnetic separation;
step three, grinding and screening: feeding the magnetic separation rough concentrate into a three-section moxa sand grinding-grading system, wherein the grinding fineness of-0.037 mm accounts for more than 96%, feeding a grading overflow product into a high-frequency fine sieve for fine sieve screening, and returning the product on the sieve to the three-section milling-grading system in a closed circuit;
step four, washing and selecting: feeding the product under the fine screen into an elutriation machine for fine selection;
step five, flotation: according to the requirement of downstream smelting on the fluorine content, the ceramic washing concentrate product is subjected to flotation operation, an inhibitor and an iron reverse flotation collector are added, the flotation temperature is 30 ℃, and the fluorine content is further reduced through the reverse flotation operation; finally obtaining flotation concentrate.
2. The ore grading process according to claim 1, wherein in the second step, the secondary grinding classification overflow product is subjected to a primary low-intensity magnetic separation process to obtain primary low-intensity magnetic separation rough concentrate, and tailings are thrown out.
3. The ore grading process according to claim 2, characterized in that the concentrate from the first stage of low intensity magnetic separation is subjected to a second stage of low intensity magnetic separation and the tailings are thrown out.
4. A process for the beneficiation of ore according to claim 3, wherein the magnetic field strength of the first stage low intensity magnetic separation process is 1800 oersted and the magnetic field strength of the second stage low intensity magnetic separation process is 1600 oersted.
5. A process for ore beneficiation according to claim 1, wherein the magnetic field strength of the ceramic wash magnetic separator, the fixed magnetic field and the circulating magnetic field strength are 1800 oersted, and the compensating magnetic field strength is 1100 oersted.
6. A process for the beneficiation of ore according to claim 1, whereinThe washing water of the elutriation machine is the circulating water of a concentrating mill, and the washing water volume is 5-7m 3 And feeding ore per ton.
7. A process for the beneficiation of ore according to claim 1, wherein the fine screen mesh is 0.074 mm.
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