CN114985117A - Method for removing sulfur from high-sulfur magnetite - Google Patents

Method for removing sulfur from high-sulfur magnetite Download PDF

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CN114985117A
CN114985117A CN202210548055.0A CN202210548055A CN114985117A CN 114985117 A CN114985117 A CN 114985117A CN 202210548055 A CN202210548055 A CN 202210548055A CN 114985117 A CN114985117 A CN 114985117A
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sulfur
activating
magnetite
pyrrhotite
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柯柏友
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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
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/001—Flotation agents
    • B03D1/018—Mixtures of inorganic and organic compounds
    • 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
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D2201/00—Specified effects produced by the flotation agents
    • B03D2201/02—Collectors
    • 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
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D2203/00—Specified materials treated by the flotation agents; specified applications
    • B03D2203/02—Ores
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

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Abstract

The invention discloses a method for removing sulfur from high-sulfur magnetite, which comprises the steps of activating pyrrhotite by combining an activating agent in an alkaline environment, and separating pyrrhotite and pyrite by flotation so as to achieve the purpose of removing sulfur; the combined activating agent consists of sodium sulfide, sodium fluosilicate and sodium gluconate, the combined collecting agent consists of isoamyl xanthate and ammonium butyrate black powder, and the foaming agent is 2# oil; adding an activating agent sodium sulfide into a feed inlet of a mill, grinding, adjusting the concentration of ore pulp, adding a combined activating agent, stirring and activating, adding a combined collecting agent and a foaming agent, stirring and inflating, and extracting sulfur concentrate, and performing magnetic separation on the ore pulp subjected to flotation to separate iron concentrate from nonmagnetic gangue so as to realize the purpose of removing sulfur from the iron concentrate; the method of the invention adopts the method of combining the activating agent and the composite collecting agent in the alkaline environment, can realize the effect of 1+1 being more than 2, solves the problem that the pyrrhotite is difficult to remove from the magnetite in the prior art, and realizes the purpose of efficiently removing sulfur from the high-sulfur magnetite in the alkaline environment.

Description

Method for removing sulfur from high-sulfur magnetite
Technical Field
The invention discloses a method for removing sulfur from high-sulfur magnetite, and relates to the field of mineral processing.
Background
Iron ore is a main raw material in the steel industry and belongs to an important strategic resource of China. However, iron ores in China mostly have the characteristics of poor quality, fine quality and impurity quality, and the iron ores are required to be selected, so that the aim of improving the grade of iron ore concentrate and reducing S, P, AI in scientific research and production is to improve the grade of iron ore concentrate 2 O 3 、SiO 2 And the content of harmful impurity elements. A large amount of foreign high-grade and high-quality iron ores are imported, so that the defects of insufficient iron ore resources and low quality of China are overcome, and the grade and quality of the charged iron of the blast furnace in China are improved. Foreign iron ore has high iron content and low silicon, aluminum, phosphorus and sulfur contentThe landed price is similar to that of domestic self-produced iron ore concentrate, so that the foreign iron ore has strong competitiveness in the Chinese market. Therefore, domestic iron mines have to be made up and down with the improvement of iron ore concentrate grade and the reduction of impurities.
The content of sulfur in iron ore directly affects the quality of the steel materials, so that the desulfurization of iron ore becomes a very important part of the ore dressing process.
The iron extraction and sulfur reduction of the high-sulfur magnetite ore are generally carried out by adopting a combined process of ore grinding, magnetic separation and floatation, namely, grinding the raw ore to a proper ore grinding granularity, carrying out low-intensity magnetic separation and tailing discarding to obtain magnetite concentrate with qualified iron grade, and carrying out reverse floatation desulfurization on the magnetite concentrate.
The pyrite chemical component is FeS 2 Since pyrite is rich in sulfur, it is generally used as a main mineral raw material for extracting sulfur and producing sulfuric acid in a sulfuric acid plant. In pyrite crystals, two S are contained 2- The ions form an anionic group [ S ] 2 ] 2- . The pyrite presents complete crystallization after being crushed, the cleavage surface is oleophilic and hydrophobic, and the hydrophobic double-xanthate is easily formed on the surface of the xanthate collecting agent, so that the flotation of the pyrite is facilitated, and the flotation separation of the pyrite and the magnet is relatively easy.
Pyrrhotite Fe 1-X S (X is 0.1-0.2) is a sulfide mineral of iron in the red arsenium nickel ore group, the sulfur content of the sulfide mineral reaches 40%, and the sulfide mineral can be used as a raw material for producing sulfuric acid. Pyrrhotite has a metallic luster and is a dark bronze yellow reddish band. Generally produced in the form of blocks in the copper nickel sulfide deposit. The crystal form is hexagonal plate-like, columnar or barrel-like, but rarely occurs, and usually presents a dense bulk aggregate.
The pyrrhotite has homogeneous multi-image variants of three crystal systems of monoclinic system, hexagonal system and orthorhombic system, and the pyrrhotite of the orthorhombic system is few and basically is a mixture of the monoclinic system and the hexagonal system. The physical properties, chemical compositions and crystal structures of pyrrhotite directly determine the characteristics of the pyrrhotite such as floating characteristic, surface oxidation-prone degree and brittleness. The floatability is poor, and the iron sulfide mineral belongs to the iron sulfide mineral which is difficult to float.
The magnetite desulfurization problem becomes the source of the product quality of the elbow-stopping iron concentrateDue primarily to the difficulty of separating pyrrhotite from magnetite. The reason can be summarized into 4 aspects: (1) magnetite has a density similar to that of pyrrhotite and a magnetic property similar to that of pyrrhotite, and cannot be separated effectively even by a method of reducing the magnetic induction intensity. In addition, the magnetite and the pyrrhotite are easy to generate magnetic agglomeration, the magnetite and the pyrrhotite are also easy to generate heterogeneous magnetic agglomeration through the action of residual magnetism after magnetic separation, the fine-grain pyrrhotite can be adhered to the surface of the magnetite due to the magnetization, and when the mineral granularity is fine, the magnetic agglomeration phenomenon is more serious, so that the magnetite and the pyrrhotite are difficult to separate effectively, which is proved in various industrial practices; (2) the floatability of the pyrrhotite of the hexagonal system is inferior to that of the pyrrhotite of the single crystal system, the floatability of the pyrrhotite of the hexagonal system and the pyrrhotite of the single crystal system is different, and the pyrrhotite of the two crystal systems is difficult to be removed from the magnetite under the same sorting condition; (3) the surface oxidation speed of the pyrrhotite is fast, according to the report, under the same condition, the oxidation speed of the pyrrhotite can reach 20 to 100 times of the oxidation speed of the pyrrhotite, and under a certain condition, the surface of the pyrrhotite is oxidized to generate Fe 2 (SO 4 ) 3 With FeSO 4 Meanwhile, although the elemental sulfur is generated, the surface area is increased after the elemental sulfur is argillized, the elemental sulfur is easy to be seriously oxidized, and an iron hydroxide hydrophilic layer is further generated on the surface, so that the floatability of the iron hydroxide hydrophilic layer is reduced; (4) experimental research shows that if bubbles are adhered to ore particles, obstacles capable of being attached are required to be overcome between the bubbles and the ore particles, effective adhesion can be generated only when the contact angle is larger than 0 degree under the condition, the existence of the obstacles capable of being attached is the primary obstacle which causes difficulty in the adhesion process, and the argillaceous fine-grain pyrrhotite is difficult to overcome because the collision probability with the bubbles is low due to the small mass and momentum, and the adhesion and the bubble surface caused by the obstacles capable of being attached between the fine-grain pyrrhotite and the bubbles are difficult to overcome, so that the pyrrhotite is difficult to float.
Aiming at the problem that magnetite and pyrrhotite are difficult to separate by flotation, a great deal of work and research is carried out by related technical personnel, and the activators of pyrrhotite are summarized to be copper sulfate, sodium sulfide, sodium fluosilicate, oxalic acid, sulfuric acid, MHH-1, NH, copper sulfate, sulfuric acid, oxalic acid, copper sulfate, sodium thiosulfate, water glass, sulfuric acid, copper sulfate, water glass and the like, and the activators are effective for the separation of magnetite and pyrrhotite by flotation, but the activators have larger property difference due to different sulfur-containing minerals, and can not achieve satisfactory effect on the separation effect of magnetite and pyrrhotite by flotation. For example: the activating agent is adopted to separate magnetite and pyrrhotite of a certain high-sulfur magnetite mountain in Dayue city in Hubei province in a flotation mode, TFe 56%, TS 9.8% and 90% of sulfur-containing minerals are pyrrhotite, the sulfur content of iron concentrate obtained by magnetic separation and recovery after the activating agent is adopted to activate flotation is about 9%, and the ultra-high sulfur-containing iron concentrate is daunting for steel manufacturers and becomes an irretrievable market. Through multi-research organization and multi-department attack and customs research, the high sulfur of the iron concentrate powder can not be reduced all the time, and serious loss is brought to the mine economy.
In addition, most of the prior art methods for desulfurizing magnetite containing pyrrhotite are to carry out activated flotation desulfurization treatment on pyrrhotite under acidic conditions. For example, the Chinese invention patent CN 108097452A discloses a mineral processing technology for producing high-quality iron ore concentrate from iron ore, which takes aluminum sulfate or a mixture of aluminum sulfate and ammonium fluorosilicate with the mass ratio of 3-1: 1-2 or a mixture of aluminum sulfate and sodium phosphate with the mass ratio of 1-2: 3-2 as a pH regulator and an activator of pyrrhotite, and carries out flotation desulfurization under the condition of adjusting the pH to 4.5-5.5, but the acidic condition seriously corrodes flotation equipment, pipelines and the like, the consumption of reagents is large, and the industrial production cost is high.
Therefore, the novel technology for activating the pyrrhotite desulfurization in the alkaline environment is a scientific research project to be urgently attacked, and has more practical significance than the technology for activating the pyrrhotite desulfurization in the alkaline environment in the acidic environment.
Disclosure of Invention
In order to solve the problems pointed out in the background technology, the invention discloses a method for removing sulfur from high-sulfur magnetite, which adopts the steps of activating pyrrhotite by combining an activating agent in an alkaline environment, and separating the pyrrhotite by flotation to achieve the purpose of removing sulfur; the combined activating agent consists of sodium sulfide, sodium fluosilicate and sodium gluconate, the combined collecting agent consists of isoamyl xanthate and ammonium butyrate nigrogen, and the foaming agent is 2# oil; the method can effectively activate pyrrhotite, effectively reduce the sulfur content in the iron ore concentrate, and reduce the sulfur content in the iron ore concentrate to below 0.3 percent;
according to the method for removing sulfur from the high-sulfur magnetite, the dosage ratio of the combined activating agent is 2-4: 3-12: 1-2 by mass.
The process of eliminating sulfur from high sulfur magnetite includes the steps of mixing sodium sulfide, sodium fluorosilicate and sodium gluconate in the weight ratio of 3 to 9 to 1.5.
According to the method for removing sulfur from the high-sulfur magnetite, the combined collecting agent is used according to the mass ratio, and the mass ratio of the isoamyl xanthate to the ammonium butyrate black is 3: 1.
In the method for removing sulfur from high-sulfur magnetite, the foaming agent is No. 2 oil.
According to the method for removing sulfur from the high-sulfur magnetite, the adding amount of the combined activating agent, the combined collecting agent and the foaming agent is increased or decreased along with the content of the pyrrhotite in the magnetite, and the adding amount of the combined activating agent, the combined collecting agent and the foaming agent is in direct proportion to the content of the pyrrhotite in the magnetite.
The invention relates to a method for removing sulfur from high-sulfur magnetite, wherein sodium sulfide of one of combined activators is added into a feed port of a ball mill in a full dosage, the adding proportion of other combined activators, a collecting agent and foaming agent No. 2 oil in roughing accounts for 40-60% of the total adding dosage, and the adding proportion of one-four scavenging accounts for 40-60% of the total adding dosage.
A method for removing sulfur from high-sulfur magnetite comprises the following steps:
1) grinding raw ore by a crushing ball mill, adding 1000 g/ton of 100-sodium sulfide according to the dry weight of the ore, wherein the grinding fineness of the ground ore reaches-200 meshes and accounts for 50-90% of the ground ore with the solid-liquid ratio of 1: 1;
2) adjusting the concentration of the ore pulp to 35-50% and entering a flotation tank, calculating the dosage according to the dry weight of minerals, sequentially adding 1000-3000 g/ton of combined activating agent sodium fluosilicate and 400-400 g/ton of sodium gluconate, and stirring and activating for 3-7 min;
3) adding collecting agents of isoamyl xanthate 90-500 g/ton and butylammonium nigride 30-170 g/ton in sequence according to the dry weight of the mineral, and stirring and activating for 3-5 min;
4) adding 10-120 g/ton foaming agent No. 2 oil according to the dry weight of the minerals, stirring and activating for 2-3min, aerating and extracting sulfur concentrate;
5) the flotation adopts a process of first roughing, second to fourth scavenging separation of sulfur ore and third to fourth concentration purification of sulfur concentrate;
6) and (4) carrying out magnetic separation on the ore pulp subjected to flotation in a drum-type magnetic separator to realize the separation of magnetite and non-magnetic gangue and obtain qualified magnet fine powder.
The invention relates to a method for removing sulfur from high-sulfur magnetite, which combines sodium sulfide which is one of activating agents, wherein the sodium sulfide is commonly used for the sulfuration flotation of oxidized ore, namely used as a vulcanizing agent of the oxidized ore, and can generate a layer of sulfide ore film on the surface of the oxidized ore, effectively relieve the argillization and oxidation of pyrrhotite in the ore grinding process and also serve as a PH alkaline regulator.
One of the combined activators, sodium fluosilicate is hydrolyzed to generate hydrofluoric acid, so that the surfaces of sulfide mineral particles can be well cleaned, and the slurry dispersing effect is strong.
The sodium gluconate which is one of the combined activators is an organic matter and has wide industrial application, can be used as a high-efficiency chelating agent in the industries of construction, textile printing and dyeing, metal surface treatment, water treatment and the like, a steel surface cleaning agent, a glass bottle cleaning agent, aluminum oxide coloring in the electroplating industry, and can be used as a high-efficiency retarder, a high-efficiency water reducing agent and the like in the concrete industry. The sodium gluconate has higher scale inhibition performance and is a green scale inhibitor. And calcium, magnesium and iron ions in the ore pulp can be effectively removed to form precipitate, so that the surface of pyrrhotite is not polluted under an alkaline condition, the collecting of the collecting agent is facilitated, and the consumption of collecting agent molecules is reduced.
According to the method for removing sulfur from high-sulfur magnetite, the process flow of first floating and then magnetic in an alkaline environment is adopted, the effect that 1+1 is larger than 2 is realized by adopting a treatment method of combining an activating agent and a composite collecting agent, tests and industrial production prove that the sulfur content of iron ore concentrate is reduced to be below 0.3 percent, the iron ore concentrate is about 68 percent, and the recovery rate of iron is up to 88 percent. The method well solves the problem that the separation of the magnetite and the pyrrhotite is difficult in the prior art, realizes the purpose of efficiently removing sulfur from the high-sulfur magnetite in the alkaline environment, and achieves a very satisfactory effect.
Drawings
Figure 1 is a flow diagram of a combined activation flotation process.
Detailed Description
Example 1
In a high-sulfur magnet mine in Dayu city of Hubei province, raw ore TFe54.37%, TS 9.8% and sulfur mineral 80% are pyrrhotite.
1) Grinding raw ore by a crushing ball mill, adding 1000 g/ton of sodium sulfide according to the dry weight of the ore, wherein the solid-liquid ratio of the ground ore is 1: 1, and the grinding fineness reaches-200 meshes and accounts for 80 percent;
2) adjusting the concentration of the ore pulp to 40 percent, entering a flotation tank, calculating the dosage according to the dry weight of minerals, adding 1500 g/ton of combined activating agent sodium fluosilicate and 150 g/ton of sodium gluconate in sequence, and stirring and activating for 6 min;
3) adding 100 g/ton of collecting agent isoamyl xanthate and 35 g/ton of ammonium buterate black agent in sequence according to the dry weight of the mineral, and stirring and activating for 5 min;
4) adding 50 g/ton foaming agent No. 2 oil according to the dry weight of the minerals, stirring for 2min, aerating and extracting the sulfur ore for 5 min;
5) after the roughing, adding 750 g/ton of sodium fluosilicate as a combined activating agent and 75 g/ton of sodium gluconate in sequence, stirring and activating for 4 min;
6) adding collecting agents of isoamyl xanthate 50 g/ton and butylammonium nigride 17 g/ton in sequence according to the dry weight of the mineral, and stirring and activating for 4 min;
7) adding 20 g/ton of foaming agent No. 2 oil according to the dry weight of the minerals, stirring for 2min, and carrying out air-charging scavenging on the sulfur ore for 5 min;
8) after the first scavenging, adding 750 g/ton of combined activating agent sodium fluosilicate and 75 g/ton of sodium gluconate in sequence, stirring and activating for 4 min;
9) adding collecting agents of isoamyl xanthate 50 g/ton and butylammonium nigride 17 g/ton in sequence according to the dry weight of the mineral, and stirring and activating for 4 min;
10) adding 10 g/ton of foaming agent No. 2 oil according to the dry weight of the minerals, stirring for 2min, and carrying out air scavenging for two times to obtain sulfur concentrate for 3 min;
11) after the second scavenging, adding 30 g/ton of collecting agents isoamyl xanthate and 10 g/ton of butylammonium black according to the dry weight of the minerals in sequence, and stirring and activating for 3 min;
12) adding 10 g/ton of foaming agent No. 2 oil according to the dry weight of the minerals, stirring for 2min, and carrying out air-charging scavenging for three times to obtain sulfur ores for 3 min;
13) and (4) carrying out magnetic separation on the ore pulp subjected to flotation in a roller magnetic separator mode, and separating magnetite from nonmagnetic gangue to obtain qualified magnet concentrate powder.
Through detection, the iron content of the iron concentrate powder is 68.98 percent, the sulfur content is 0.29 percent, the excellent effect is obtained, and the major problem is solved for mine enterprises. Meanwhile, great economic benefits are brought to the enterprise.
Example 2
In a high-sulfur magnet mine in Ezhou city, Hubei province, raw ore TFe 58.7%, TS 4.3%, and sulfur mineral 70% are pyrrhotite.
1) Grinding raw ore by crushing and feeding the raw ore into a ball mill, adding 900 g/ton of sodium sulfide according to the dry weight of the ore, wherein the solid-liquid ratio of the ground ore is 1: 1, and the grinding fineness reaches-200 meshes and accounts for 75 percent;
2) adjusting the concentration of the ore pulp to 40%, feeding the ore pulp into a flotation tank, calculating the dosage according to the dry weight of minerals, sequentially adding 1000 g/ton of sodium fluosilicate serving as a combined activator and 100 g/ton of sodium gluconate, and stirring and activating for 6 min;
3) adding collecting agents of isoamyl xanthate 90 g/ton and butylammonium nigride 30 g/ton in sequence according to the dry weight of the mineral, and stirring and activating for 5 min;
4) adding 40 g/ton of foaming agent No. 2 oil according to the dry weight of the minerals, stirring for 2min, aerating and extracting sulfur ore for 5 min;
5) after the roughing, adding 500 g/ton of sodium fluosilicate as a combined activating agent and 50 g/ton of sodium gluconate in sequence, stirring and activating for 4 min;
6) adding collecting agents of isoamyl xanthate 50 g/ton and butylammonium nigricans 17 g/ton in sequence according to the dry weight of the mineral, stirring and activating for 4 min;
7) adding 20 g/ton of foaming agent No. 2 oil according to the dry weight of the minerals, stirring for 2min, and carrying out air-charging scavenging on the sulfur ore for 5 min;
8) after the first scavenging, adding 500 g/ton of combined activating agent sodium fluosilicate and 50 g/ton of sodium gluconate in sequence, stirring and activating for 4 min;
9) adding collecting agents of isoamyl xanthate 50 g/ton and butylammonium nigride 17 g/ton in sequence according to the dry weight of the mineral, and stirring and activating for 4 min;
10) adding 10 g/ton of foaming agent No. 2 oil according to the dry weight of the minerals, stirring for 2min, and carrying out air scavenging for two times to obtain sulfur concentrate for 3 min;
11) after the second scavenging, adding 30 g/ton of collecting agents isoamyl xanthate and 10 g/ton of butylammonium black according to the dry weight of the minerals in sequence, and stirring and activating for 3 min;
12) adding 10 g/ton of foaming agent No. 2 oil according to the dry weight of the minerals, stirring for 2min, and carrying out air-charging scavenging for three times to obtain sulfur ores for 3 min;
13) and (4) carrying out magnetic separation on the ore pulp after the flotation in a roller magnetic separator, and separating magnetite from nonmagnetic gangue to obtain qualified magnet concentrate powder.
Through detection, the iron content of the iron concentrate powder is 68.87 percent, the sulfur content is 0.21 percent, the excellent effect is obtained, and the problem is solved for mine enterprises. Meanwhile, great economic benefits are brought to the enterprise.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (6)

1. A method for removing sulfur from high-sulfur magnetite is characterized by comprising the following steps: activating pyrrhotite by combining an activating agent in an alkaline environment, and separating the pyrrhotite by flotation to achieve the aim of removing sulfur; the combined activating agent consists of sodium sulfide, sodium fluosilicate and sodium gluconate, the combined collecting agent consists of isoamyl xanthate and ammonium butyrate black powder, and the foaming agent is 2# oil; the method can effectively activate pyrrhotite under the alkaline condition, effectively reduce the sulfur content in the iron ore concentrate, and reduce the sulfur content in the iron ore concentrate to be less than 0.3 percent.
2. The method of desulfurizing high sulfur magnetite according to claim 1, wherein: the specific implementation comprises the following steps:
1) grinding the raw ore by a crushing ball mill, wherein the solid-liquid ratio of the ground ore is 1: 1, 1000 g/ton of 100-200 meshes of sodium sulfide is added according to the dry weight of the ore, and the grinding fineness reaches-200 meshes and accounts for 50-90 percent;
2) adjusting the concentration of the ore pulp to 35-50%, entering a flotation tank, calculating the adding amount according to the dry weight of the minerals, sequentially adding 1000-3000 g/ton of composite activating agent sodium fluosilicate and 400 g/ton of sodium gluconate, and stirring and activating for 3-7 min;
3) adding collecting agents of isoamyl xanthate 90-500 g/ton and butylammonium nigride 30-170 g/ton in sequence according to the dry weight of the mineral, and stirring and activating for 3-5 min;
4) adding 10-120 g/ton foaming agent No. 2 oil according to the dry weight of the minerals, stirring and activating for 2-3min, aerating and extracting sulfur concentrate;
5) the flotation adopts a process of first roughing, second to fourth scavenging separation of sulfur ore and third to fourth concentration purification of sulfur concentrate;
6) and (4) carrying out magnetic separation on the ore pulp subjected to flotation in a drum-type magnetic separator to realize the separation of magnetite and nonmagnetic gangue and obtain qualified magnet fine powder.
3. The method for desulfurizing high-sulfur magnetite according to claims 1-2, wherein: the medicine proportion of the combined activating agent is 2-4: 3-12: 1-2 by mass ratio of sodium sulfide, sodium fluosilicate and sodium gluconate.
4. The method for desulfurizing high-sulfur magnetite according to claims 1-2, wherein: the medicine proportion of the combined activating agent is 3: 9: 1.5 by mass ratio of sodium sulfide, sodium fluosilicate and sodium gluconate.
5. The method for desulfurizing high-sulfur magnetite according to claims 1-2, characterized in that: the combined collecting agent is used according to the mass ratio of isoamyl xanthate to ammonium butyrate melanophore which is 3: 1.
6. The method for desulfurizing high-sulfur magnetite according to claims 1-2, wherein: the sodium sulfide of one of the combined activators was added in full at the ball mill feed inlet.
CN202210548055.0A 2022-04-24 2022-04-24 Method for removing sulfur from high-sulfur magnetite Pending CN114985117A (en)

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