CN110090731B - Process for dressing low-grade magnesite by using magnetic fluid - Google Patents
Process for dressing low-grade magnesite by using magnetic fluid Download PDFInfo
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- CN110090731B CN110090731B CN201910417957.9A CN201910417957A CN110090731B CN 110090731 B CN110090731 B CN 110090731B CN 201910417957 A CN201910417957 A CN 201910417957A CN 110090731 B CN110090731 B CN 110090731B
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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
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B7/00—Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage
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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
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B9/00—General arrangement of separating plant, e.g. flow sheets
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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
- B03C1/02—Magnetic separation acting directly on the substance being separated
- B03C1/30—Combinations with other devices, not otherwise provided for
Abstract
The invention provides a process method for low-grade magnesite beneficiation by adopting magnetic fluid, which comprises the following steps: crushing, stirring, screening, grinding, slurry mixing, magnetizing, magnetic separation and other steps. After the low-grade magnesite is crushed in two stages, the stirring and water washing vibrating screen ore washing process of a vertical turbulent mixer is added, and the purpose is to increase Ca dissolved out from the surface of dolomite by strong stirring2+、Mg2+Speed and washing the ore with high pressure water to remove Ca adsorbed on the surface of the ore2+、Mg2+The method has the advantages of improving the difference between the surface property of magnesite and dolomite, improving sorting precision, reducing the dosage of sorting chemicals and magnetic seeds, improving the grade and recovery rate of magnesite concentrate, along with simple process, low dosage of chemicals, low cost and better social and economic benefits.
Description
Technical Field
The invention relates to the technical field of low-grade magnesite beneficiation, in particular to a process method for low-grade magnesite beneficiation by adopting magnetic fluid.
Background
Magnesite is a main raw material for refining metal magnesium, 2/3 of world magnesite reserves is concentrated in China, 1/2 of yield is provided by China, and China plays a very important role in the world magnesite market. Although natural magnesite resources in China are quite rich, after being mined for decades, magnesite of commercial grade is less and less, and particularly, high-grade magnesite cannot meet production requirements in some regions. The low-grade magnesite cannot be directly used for producing high-grade products, and especially, a large amount of low-grade magnesite cannot be utilized, so that the magnesite resource is wasted. Therefore, in the long term, in order to better utilize resources, the impurity silicon of magnesite is removed by a beneficiation method, and low-grade magnesite is changed into a high-quality refractory material capable of being calcined. So as to solve the problems of low utilization rate of magnesite resources and shortage of high-grade magnesite.
Magnetofluid mineral separation is a new technology in magnetic separation, and comprises magnetohydrostatic separation and magnetohydrodynamic separation. The ore dressing method is characterized in that a special flow ratio is used as a sorting medium, and different minerals are separated according to the difference of magnetism and density of the minerals or the difference of magnetism, conductivity and density by utilizing the 'aggravating' effect of special fluids under the combined action of a magnetic field or a magnetic field and an electric field. When the magnetic difference between minerals is small and the difference of density or conductivity is large, the effective separation can be realized by adopting the magnetofluid beneficiation method.
At present, the mineral species separated by the magnetic fluid in China mainly comprise low-grade copper nickel sulfide ore, pentlandite, coal slime, placer gold, limonite and the like, and the separation of the low-grade magnesite by the technology is not found.
Disclosure of Invention
The invention aims to provide a process method for low-grade magnesite beneficiation by adopting magnetic fluid, wherein the low-grade magnesite is subjected to crushing, ore washing, ore grinding and magnetic fluid separation to obtain MgO more than 47.24%, MgO recovery rate more than 78%, CaO less than 0.5%, and SiO2Less than 0.3% of magnesite concentrate powder can be used as raw material for smelting magnesium after granulation. The method has simple process, and can partially remove soluble Ca by stirring with high-strength stirrer and washing with ore washing device2+Influence on subsequent ore dressing, and removal of gangue minerals such as quartz, dolomite and the like through magnetofluid ore dressing, so that the low-grade magnesite is sorted to prepare the high-quality raw material for smelting magnesium.
The technical scheme of the invention is realized as follows:
a process method for low-grade magnesite beneficiation by adopting magnetic fluid comprises the following steps:
(1) crushing low-grade magnesite by a first-section hydraulic cone crusher and a second-section high-pressure roller mill crusher in sequence to obtain a material a;
(2) conveying the material a in the step (1) to a vertical turbulent mixer through a belt for fully stirring to obtain homogeneous ore pulp;
(3) pumping the homogenized ore pulp obtained in the step (2) to a washing vibrating screen through a slurry pump for screening to obtain oversize products;
(4) delivering the oversize product obtained in the step (3) to an overflow rod mill for ore grinding to obtain a material b;
(5) and (5) carrying out size mixing, magnetization and magnetic separation on the material b obtained in the step (4) to obtain magnetic concentrate and magnetic tailings. Preferably, the content of beneficial components MgO in the low-grade magnesite in the step (1) is 38%, the content of main impurities CaO is 2.25%, and SiO is2Content 9.84%, according toThe classification standard of magnesite ore grade, the ore belongs to high-silicon high-calcium type low-grade magnesite.
Preferably, the granularity of the material a in the step (1) is-0.5 mm and accounts for 40-45%.
Preferably, the solid-to-liquid ratio in the stirrer in the step (2) is 1 (2.5-3).
Preferably, the size of the sieve pore of the water washing vibrating sieve in the step (3) is-0.1 mm, the water pressure of ore washing is 0.25 MPa-0.30 MPa, and the water consumption is 1.5-2 m3/t。
Preferably, the granularity of the material b in the step (4) is 80-90% in a range of-0.074 mm, and the ore grinding concentration is 55-60%.
Preferably, the pulp mixing in the step (5) adopts sodium carbonate as a pH value regulator with the dosage of 50-80 g/t, adopts sodium hexametaphosphate as a dispersing agent with the dosage of 180-200 g/t, adopts sodium alginate and ether amine as activating agents, the dosage of the sodium alginate is 30-40 g/t, the dosage of the ether amine is 100-120 g/t, the pH value of the pulp is regulated to be 6.8-7.2, and the concentration of the pulp is 25-30%.
Preferably, magnetite is selected as the magnetic seed in the magnetization step (5), the particle size is 10-12 μm, the dosage is 50-55 kg/t, the magnetite modifier is a mixture of stearic acid and sodium oleate, the dosage is 8-10% of the mass of the magnetite, and the mass ratio of the stearic acid to the sodium oleate is 1: 4.
Preferably, the magnetic separation in the step (5) adopts a high-gradient magnetic separator, and the magnetic field intensity is 1.3T-1.5T. Preferably, the magnetic separation concentrate in the step (5) is gangue minerals containing dolomite and quartz, the magnetic separation tailings are useful minerals containing magnesite, the MgO of the magnesite concentrate is more than 47.24%, the MgO recovery rate is more than 78%, the CaO is less than 0.5%, and the SiO is2Less than 0.3 percent, and meets the requirement of the raw material for smelting magnesium.
The invention has the beneficial effects that:
after the low-grade magnesite is crushed in two stages, the stirring and water washing vibrating screen ore washing process of a vertical turbulent mixer is added, and the purpose is to increase Ca dissolved out from the surface of dolomite by strong stirring2+、Mg2+Speed and removal by high pressure water flushing of the oreCa adsorbed on the surface of ore2+、Mg2+The method has the advantages of improving the difference between the surface property of magnesite and dolomite, improving sorting precision, reducing the dosage of sorting chemicals and magnetic seeds, improving the grade and recovery rate of magnesite concentrate, along with simple process, low dosage of chemicals, low cost and better social and economic benefits.
Detailed Description
The technical solution of the present invention will be described in detail and fully with reference to the following examples, and it should be understood that the described examples are only a part of the examples of the present invention, and not all of the examples. 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.
Example 1:
a process method for low-grade magnesite beneficiation by adopting magnetic fluid comprises the following steps:
(1) crushing low-grade magnesite by a first-section hydraulic cone crusher and a second-section high-pressure roller mill crusher in sequence, wherein the ore removal granularity is controlled to be minus 0.5mm and accounts for 40%, and obtaining a material a;
(2) conveying the material a in the step (1) to a vertical turbulent mixer through a belt for fully stirring, wherein the solid-liquid ratio is 1:2.5, and obtaining homogeneous ore pulp;
(3) pumping the homogenized ore pulp obtained in the step (2) to a washing vibrating screen through a slurry pump for screening, wherein the size of a screen hole of the washing vibrating screen is-0.1 mm, the washing water pressure is 0.25Mpa, and the water consumption is 1.5m3T, obtaining oversize products;
(4) delivering the oversize product obtained in the step (3) to an overflow rod mill for grinding, wherein the grain size of the ground ore discharge is controlled to be 80% at-0.074 mm, and the grinding concentration is 55%, so as to obtain a material b;
(5) mixing the material b in the step (4), adjusting the pH value of the ore pulp to 6.8, adjusting the concentration of the ore pulp to 25%, adopting sodium carbonate as a pH value adjusting agent with the dosage of 50g/t, adopting sodium hexametaphosphate as a dispersing agent with the dosage of 180g/t, adopting sodium alginate and ether amine as activating agents with the dosage of 30g/t and the dosage of 100 g/t;
(6) magnetizing the material mixed in the step (5), selecting magnetite as a magnetic seed, wherein the particle size of the magnetite is 10 mu m, the dosage of the magnetite is 50kg/t, a magnetite modifier is a mixture of stearic acid and sodium oleate, the dosage of the magnetite modifier is 8% of the mass of the magnetite, and the mass ratio of the stearic acid to the sodium oleate is 1: 4;
(7) and (4) carrying out magnetic separation on the material magnetized in the step (6), and obtaining magnetic concentrate and magnetic tailings by adopting a high-gradient magnetic separator and the magnetic field intensity of 1.3T.
The magnetic separation concentrate prepared by the embodiment is gangue mineral containing dolomite and quartz, the magnetic separation tailings are useful mineral containing magnesite, the MgO content of the magnesite concentrate is 48.36%, the MgO recovery rate is 79%, the CaO content is 0.45%, and the SiO content is 020.28 percent, and meets the requirement of the raw material for smelting magnesium.
Example 2:
a process method for low-grade magnesite beneficiation by adopting magnetic fluid comprises the following steps:
(1) crushing low-grade magnesite by a first-section hydraulic cone crusher and a second-section high-pressure roller mill crusher in sequence, wherein the ore removal granularity is controlled to be minus 0.5mm and accounts for 43 percent, and obtaining a material a;
(2) conveying the material a in the step (1) to a vertical turbulent mixer through a belt for fully stirring, wherein the solid-liquid ratio is 1:2.7, and obtaining homogeneous ore pulp;
(3) pumping the homogenized ore pulp obtained in the step (2) to a washing vibrating screen through a slurry pump for screening, wherein the size of a screen hole of the washing vibrating screen is-0.1 mm, the washing water pressure is 0.28Mpa, and the water consumption is 1.7m3T, obtaining oversize products;
(4) delivering the oversize product obtained in the step (3) to an overflow rod mill for grinding, wherein the grain size of the ground ore discharge is controlled to be 85% in the range of-0.074 mm, and the grinding concentration is 57% to obtain a material b;
(5) mixing the material b in the step (4), adjusting the pH value of the ore pulp to be 7, adjusting the concentration of the ore pulp to be 28%, adopting sodium carbonate as a pH value adjusting agent with the dosage of 65g/t, adopting sodium hexametaphosphate as a dispersing agent with the dosage of 190g/t, adopting sodium alginate and ether amine as activating agents with the dosage of 35g/t and the dosage of 110 g/t;
(6) magnetizing the material mixed in the step (5), selecting magnetite as a magnetic seed, wherein the particle size of the magnetite is 11 microns, the dosage of the magnetite is 53kg/t, a magnetite modifier is a mixture of stearic acid and sodium oleate, the dosage of the magnetite modifier is 9% of the mass of the magnetite, and the mass ratio of the stearic acid to the sodium oleate is 1: 4;
(7) and (4) carrying out magnetic separation on the material magnetized in the step (6), and obtaining magnetic concentrate and magnetic tailings by adopting a high-gradient magnetic separator and the magnetic field intensity of 1.4T.
The magnetic separation concentrate prepared by the embodiment is gangue mineral containing dolomite and quartz, the magnetic separation tailings are useful mineral containing magnesite, the MgO of the magnesite concentrate is 49.13%, the recovery rate of the MgO is 80%, the CaO is 0.41%, and the SiO is20.25 percent, and meets the requirement of the raw material for smelting magnesium.
Example 3:
a process method for low-grade magnesite beneficiation by adopting magnetic fluid comprises the following steps:
(1) crushing low-grade magnesite by a first-section hydraulic cone crusher and a second-section high-pressure roller mill crusher in sequence, wherein the ore removal granularity is controlled to be minus 0.5mm and accounts for 45%, and obtaining a material a;
(2) conveying the material a in the step (1) to a vertical turbulent mixer through a belt for fully stirring, wherein the solid-liquid ratio is 1:3, and obtaining homogeneous ore pulp;
(3) pumping the homogenized ore pulp obtained in the step (2) to a washing vibrating screen through a slurry pump for screening, wherein the size of a screen hole of the washing vibrating screen is-0.1 mm, the washing water pressure is 0.30Mpa, and the water consumption is 2m3T, obtaining oversize products;
(4) delivering the oversize product obtained in the step (3) to an overflow rod mill for grinding, wherein the grain size of the ground ore discharge is controlled to be-0.074 mm and accounts for 90%, and the grinding concentration is 60%, so as to obtain a material b;
(5) mixing the material b in the step (4), adjusting the pH value of the ore pulp to 7.2, adjusting the concentration of the ore pulp to 30%, adopting sodium carbonate as a pH value adjusting agent with the dosage of 80g/t, adopting sodium hexametaphosphate as a dispersing agent with the dosage of 200g/t, adopting sodium alginate and ether amine as activating agents with the dosage of 40g/t and the dosage of 120 g/t;
(6) magnetizing the material mixed in the step (5), selecting magnetite as a magnetic seed with the particle size of 12 mu m and the dosage of 55kg/t, wherein a magnetite modifier is a mixture of stearic acid and sodium oleate, the dosage of the magnetite modifier is 10% of the mass of the magnetite, and the mass ratio of stearic acid to sodium oleate is 1: 4;
(7) and (4) carrying out magnetic separation on the magnetized material in the step (6), and obtaining magnetic concentrate and magnetic tailings by adopting a high-gradient magnetic separator and the magnetic field intensity of 1.5T.
The magnetic separation concentrate prepared by the embodiment is gangue minerals containing dolomite and quartz, the magnetic separation tailings are useful minerals containing magnesite, the MgO of the magnesite concentrate is 50.04%, the MgO recovery rate is 81%, the CaO is 0.38%, and the SiO2 is 0.22%, so that the requirement of the raw materials for smelting magnesium is met.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. A process method for low-grade magnesite beneficiation by adopting magnetic fluid comprises the following steps:
(1) crushing low-grade magnesite by a first-section hydraulic cone crusher and a second-section high-pressure roller mill crusher in sequence to obtain a material a;
(2) conveying the material a in the step (1) to a vertical turbulent mixer through a belt for fully stirring to obtain homogeneous ore pulp;
(3) pumping the homogenized ore pulp obtained in the step (2) to a washing vibrating screen through a slurry pump for screening to obtain oversize products;
(4) delivering the oversize product obtained in the step (3) to an overflow rod mill for ore grinding to obtain a material b;
(5) mixing the material b obtained in the step (4), magnetizing and magnetically separating to obtain magnetic concentrate and magnetic tailings;
the slurry mixing in the step (5) adopts sodium carbonate as a pH value regulator with the dosage of 50-80 g/t, adopts sodium hexametaphosphate as a dispersing agent with the dosage of 180-200 g/t, adopts sodium alginate and ether amine as activating agents, the dosage of the sodium alginate is 30-40 g/t, the dosage of the ether amine is 100-120 g/t, the pH value of the slurry is regulated to be 6.8-7.2, and the concentration of the slurry is 25-30%.
2. The process method for magnetic fluid mineral separation of low-grade magnesite according to claim 1, wherein the beneficial components in the low-grade magnesite in the step (1) comprise 38% of MgO, 2.25% of CaO as a main impurity and 2.25% of SiO2The content is 9.84%, and the ore belongs to high-silicon high-calcium type low-grade magnesite according to the classification standard of magnesite ore grades.
3. The process method for magnetic fluid mineral separation of low-grade magnesite according to claim 1, wherein the granularity of the material a in the step (1) is-0.5 mm and accounts for 40-45%.
4. The process method for magnetic fluid mineral separation of low-grade magnesite according to claim 1, wherein the solid-to-liquid ratio in the stirrer in the step (2) is 1 (2.5-3).
5. The process method for magnetic fluid mineral separation of low-grade magnesite according to claim 1, wherein the size of the sieve pore of the water washing vibrating screen in the step (3) is-0.1 mm, the water pressure of the ore washing is 0.25 Mpa-0.30 Mpa, and the water consumption is 1.5-2 m 3/t.
6. The process method for magnetic fluid mineral separation of low-grade magnesite according to claim 1, wherein the granularity of the material b in the step (4) is 80-90% in-0.074 mm, and the grinding concentration is 55-60%.
7. The process method for magnetic fluid mineral separation of low-grade magnesite according to claim 1, wherein magnetite is selected as a magnetic seed in the magnetization in the step (5), the particle size is 10 μm to 12 μm, the dosage is 50kg/t to 55kg/t, a mixture of stearic acid and sodium oleate is used as a magnetite modifier, the dosage is 8% -10% of the mass of the magnetite, and the mass ratio of stearic acid to sodium oleate is 1: 4.
8. The process method for magnetic fluid mineral separation of low-grade magnesite according to claim 1, wherein the magnetic separation in step (5) adopts a high gradient magnetic separator, and the magnetic field intensity is 1.3T-1.5T.
9. The process method for magnetic fluid mineral separation of low-grade magnesite according to claim 1, wherein the magnetic separation concentrate in the step (5) is gangue mineral containing dolomite and quartz, the magnetic separation tailings are useful mineral containing magnesite, MgO of the magnesite concentrate is more than 47.24%, MgO recovery rate is more than 78%, CaO is less than 0.5%, and SiO is more than 0.24%2Less than 0.3 percent, and meets the requirement of the raw material for smelting magnesium.
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| DE102008047853A1 (en) * | 2008-09-18 | 2010-04-22 | Siemens Aktiengesellschaft | Process for the separation of ore particles from agglomerates which contain ore particles and magnetizable particles which are attached to them, in particular Fe 3 O 4 |
| DE102009038666A1 (en) * | 2009-08-24 | 2011-03-10 | Siemens Aktiengesellschaft | Process for continuous magnetic ore separation and / or treatment and associated plant |
| CN103801449A (en) * | 2013-12-10 | 2014-05-21 | 邹建明 | Red mud magnetofluid separating and recycling method |
| CN104785361B (en) * | 2015-04-27 | 2017-07-07 | 贾海亮 | A kind of water saving and the log washer of secondary cleaning |
| CN207951711U (en) * | 2018-01-25 | 2018-10-12 | 包头钢铁（集团）有限责任公司 | A kind of novel magnetic separation pipe charging gear |
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