CN113843050A - Iron ore dressing method for bayan obo iron-containing surrounding rock - Google Patents
Iron ore dressing method for bayan obo iron-containing surrounding rock Download PDFInfo
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- CN113843050A CN113843050A CN202111180688.2A CN202111180688A CN113843050A CN 113843050 A CN113843050 A CN 113843050A CN 202111180688 A CN202111180688 A CN 202111180688A CN 113843050 A CN113843050 A CN 113843050A
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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
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
- B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
- B07C5/34—Sorting according to other particular properties
- B07C5/342—Sorting according to other particular properties according to optical properties, e.g. colour
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
- B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
- B07C5/34—Sorting according to other particular properties
- B07C5/344—Sorting according to other particular properties according to electric or electromagnetic properties
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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
- B03D2201/00—Specified effects produced by the flotation agents
- B03D2201/02—Collectors
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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
- B03D2201/00—Specified effects produced by the flotation agents
- B03D2201/04—Frothers
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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
- B03D2201/00—Specified effects produced by the flotation agents
- B03D2201/06—Depressants
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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
- B03D2203/00—Specified materials treated by the flotation agents; specified applications
- B03D2203/02—Ores
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- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/52—Mechanical processing of waste for the recovery of materials, e.g. crushing, shredding, separation or disassembly
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- Inorganic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention provides an iron ore dressing method for bayan obo iron-containing surrounding rock, which relates to the field of ore dressing and specifically comprises the following steps: (1) crushing and screening the Bayan Obo iron-containing surrounding rock ore sample into two size fractions of 0-15mm and 15-100 mm; (2) sorting the 0-15mm size fraction by adopting a dry magnetic separation process to obtain concentrate A and tailings A; (3) sorting the 15-100mm size fraction by adopting a photoelectric separation process to obtain concentrate B and tailings B; (4) and mixing the concentrate A and the concentrate B, grinding to obtain a ground product, adding a flotation agent to obtain concentrate C and tailings C, wherein the concentrate C is the final concentrate. The method can avoid the problem of low concentrate production quality index caused by large foam amount, stickiness and poor selectivity in the existing flotation process, thereby realizing the purpose of obtaining the concentrate with high yield and iron grade.
Description
Technical Field
The invention relates to the field of ore dressing, in particular to an iron ore dressing method for bayan obo iron-containing surrounding rock.
Background
The bayan obo iron-containing surrounding rock is a kind of dolomite which is generally considered as sedimentary rock, and a few of the bayan obo iron-containing surrounding rock are considered as magma carbonate, wherein the bayan obo iron-containing surrounding rock is rich in iron, calcium, magnesium, rare earth minerals and the like and is a high-quality raw material for smelting and extracting the minerals. At present, the separation technology of iron ore usually comprises strong magnetic separation, weak magnetic separation, flotation, reverse flotation and the like, or the separation technology of iron ore is combined with the above modes to obtain iron ore concentrate with higher yield and iron grade.
However, in the case of bayan obo ore, due to the characteristics of abundance, poverty, impurities and fineness of the bayan obo ore, the sorting of the bayan obo ore has various problems of serious impurities, low iron grade and the like.
Patent CN201110221836.0 discloses a beneficiation method for separating potassium feldspar ore concentrate and iron ore concentrate from bayan obo potassium-rich slate, which comprises the processes of reverse flotation, strong magnetic separation and weak magnetic separation, and finally obtains potassium feldspar ore concentrate with the purity of more than 98 percent and the recovery rate of more than 85 percent and iron ore concentrate with the total iron grade of more than 65 percent and the recovery rate of more than 95 percent. The patent CN201110224272.6 discloses a beneficiation method for separating potassium feldspar concentrates from bayan obo potassium-rich slates, and particularly relates to a beneficiation method for preparing potassium feldspar concentrates with the potassium feldspar purity of more than or equal to 95% and the recovery rate of more than or equal to 90% from potassium-rich slates with the potassium feldspar content of 60-70% by combining fractional magnetic separation and fractional flotation, so that potassium and aluminum can be better recovered from the potassium-rich slates. In the two patents, magnetic separation, flotation and reverse flotation are combined for mineral separation, a flotation agent/reverse flotation agent is involved in the process, and the flotation agent in the prior art usually comprises a collecting agent (a cationic collecting agent and an anionic collecting agent) and an inhibitor (a starch inhibitor, a cellulose inhibitor and other inhibitors).
Therefore, the development of an iron ore dressing method for bayan obo iron-containing surrounding rock is urgently needed, so that the existing flotation agent is prevented from being sticky due to large foam amount and poor selectivity, and meanwhile, the concentrate with high yield and iron grade is obtained.
Disclosure of Invention
The invention provides an iron ore dressing method for bayan obo iron-containing surrounding rock, aiming at the problems in the prior art, and the method can obtain concentrate with high yield and iron grade while avoiding the problems of large and sticky foam amount and poor selectivity existing in the existing flotation agent.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the invention provides an iron ore dressing method for bayan obo iron-containing surrounding rock, which comprises the following steps:
(1) crushing and screening the Bayan Obo iron-containing surrounding rock ore sample into two size fractions of 0-15mm and 15-100 mm;
(2) sorting the 0-15mm size fraction by adopting a dry magnetic separation process to obtain concentrate A and tailings A;
(3) sorting the 15-100mm size fraction by adopting a photoelectric separation process to obtain concentrate B and tailings B;
(4) and mixing the concentrate A and the concentrate B, grinding to obtain a ground product with the granularity of 0-200 meshes and more than 90%, adding a flotation agent to obtain concentrate C and tailings C, wherein the concentrate C is the final concentrate.
Further, the flotation agent in the step (4) comprises: tall oil, samara oil, lutein ester, water glass, carboxymethyl cellulose and foaming agent.
Preferably, the weight ratio of the tall oil, the samara oil, the lutein ester, the water glass, the carboxymethyl cellulose and the foaming agent is 2-3:1-2:1:0.5-1:0.3-0.8:0.01-0.05, and further preferably 2.5:1.5:1:0.8:0.5: 0.02.
Further, the foaming agent is one or more of No. 2 oil, camphor oil or eucalyptus oil.
Preferably, the foaming agents are number 2 oil and eucalyptus oil.
Further, the adding amount of the flotation agent in the step (4) is specifically 0.3-0.5kg of the flotation agent per ton of the concentrate A and the concentrate B.
Further, the photoelectric separation process in the step (3) specifically comprises the following steps: scanning a part of raw ores by using an intelligent photoelectric separator to obtain an ore image, and setting different waste throwing rates from low to high through an intelligent identification algorithm until a preset concentrate index is obtained.
Further, the magnetic separation process in the step (2) specifically comprises the following steps: the method comprises the steps of processing raw ores by using a balanced high magnetic field strength dry separator, and obtaining a preset concentrate index by adjusting process parameters such as processing capacity, concentrate yield and rotating speed.
Further, the concentration of the flotation ore pulp after the flotation agent is added in the step (4) is 30-35%, the pH value is 7-8, and the temperature is 30-35 ℃.
Further, the granularity of the ore grinding in the step (4) is required to be more than 90 percent of 0-200 meshes.
The invention also provides the concentrate obtained by the separation of the iron ore separation method.
The technical effects obtained by the invention are as follows:
(1) the invention adopts the mode of combining magnetic separation, electric separation and flotation, can effectively reduce the impurity entrainment in the flotation process and achieve the purpose of improving the concentrate grade.
(2) The flotation agent in the invention is more fully contacted with minerals, and the required materials can be stably and efficiently floated through the synergistic action among the collecting agent, the inhibitor and the foaming agent in the flotation agent, so that the grade of the iron ore is improved, and the content of impurities is reduced.
(3) The raw materials used in the invention are environment-friendly, nontoxic and pollution-free, and the process is simple, and can be widely popularized and applied.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
Before the present embodiments are further described, it is to be understood that the scope of the invention is not limited to the particular embodiments described below; it is also to be understood that the terminology used in the examples is for the purpose of describing particular embodiments only, and is not intended to limit the scope of the present invention.
When numerical ranges are given in the examples, it is understood that both endpoints of each of the numerical ranges and any value therebetween can be selected unless the invention otherwise indicated. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It should be noted that the raw materials used in the present invention are all common commercial products, and thus the sources thereof are not particularly limited.
Example 1
The iron ore dressing method for the bayan obo iron-containing surrounding rock comprises the following steps:
(1) crushing and screening the Bayan Obo iron-containing surrounding rock ore sample into two size fractions of 0-15mm and 15-100 mm;
(2) sorting the 0-15mm size fraction by adopting a dry magnetic separation process (specifically, treating raw ore by using a balanced high magnetic field strength dry separator, and obtaining a preset concentrate index by adjusting process parameters such as treatment capacity, concentrate yield, rotating speed and the like) to obtain concentrate A and tailings A;
(3) sorting the 15-100mm size fraction by adopting a photoelectric sorting process (specifically, scanning a part of raw ores by using an intelligent photoelectric sorting machine to obtain an ore image, and setting different waste throwing rates from low to high through an intelligent identification algorithm until a preset ore concentrate index is obtained) to obtain an ore concentrate B and a tailing B;
(4) mixing the concentrate A and the concentrate B, grinding to obtain a ground product with the granularity of 0-200 meshes and more than 90%, adding a flotation agent, wherein the adding amount of the flotation agent is specifically that 0.3kg of the flotation agent is added into each ton of the concentrate A and the concentrate B, the concentration of flotation pulp is 30%, the pH value is 8, the temperature is 30 ℃, and then, the concentrate C and tailings C are obtained, and the concentrate C is the final concentrate.
Wherein, the flotation agent in the step (4) is tall oil, samara oil, lutein ester, water glass, carboxymethyl cellulose and No. 2 oil with the weight ratio of 2:2:1:0.5:0.8: 0.01.
Example 2
The iron ore dressing method for the bayan obo iron-containing surrounding rock comprises the following steps:
(1) crushing and screening the Bayan Obo iron-containing surrounding rock ore sample into two size fractions of 0-15mm and 15-100 mm;
(2) sorting the 0-15mm size fraction by adopting a dry magnetic separation process (specifically, treating raw ore by using a balanced high magnetic field strength dry separator, and obtaining a preset concentrate index by adjusting process parameters such as treatment capacity, concentrate yield, rotating speed and the like) to obtain concentrate A and tailings A;
(3) sorting the 15-100mm size fraction by adopting a photoelectric sorting process (specifically, scanning a part of raw ores by using an intelligent photoelectric sorting machine to obtain an ore image, and setting different waste throwing rates from low to high through an intelligent identification algorithm until a preset ore concentrate index is obtained) to obtain an ore concentrate B and a tailing B;
(4) mixing the concentrate A and the concentrate B, grinding to obtain a ground product with the granularity of 0-200 meshes and more than 90%, adding a flotation agent, wherein the adding amount of the flotation agent is specifically that 0.5kg of the flotation agent is added into each ton of the concentrate A and the concentrate B, the concentration of flotation pulp is 35%, the pH value is 8, the temperature is 35 ℃, and then, the concentrate C and tailings C are obtained, and the concentrate C is the final concentrate.
Wherein, the flotation agent in the step (4) is tall oil, samara oil, lutein ester, water glass, carboxymethyl cellulose and camphor oil with the weight ratio of 3:1:1:1:0.3: 0.01.
Example 3
The iron ore dressing method for the bayan obo iron-containing surrounding rock comprises the following steps:
(1) crushing and screening the Bayan Obo iron-containing surrounding rock ore sample into two size fractions of 0-15mm and 15-100 mm;
(2) sorting the 0-15mm size fraction by adopting a dry magnetic separation process (specifically, treating raw ore by using a balanced high magnetic field strength dry separator, and obtaining a preset concentrate index by adjusting process parameters such as treatment capacity, concentrate yield, rotating speed and the like) to obtain concentrate A and tailings A;
(3) sorting the 15-100mm size fraction by adopting a photoelectric sorting process (specifically, scanning a part of raw ores by using an intelligent photoelectric sorting machine to obtain an ore image, and setting different waste throwing rates from low to high through an intelligent identification algorithm until a preset ore concentrate index is obtained) to obtain an ore concentrate B and a tailing B;
(4) mixing the concentrate A and the concentrate B, grinding to obtain a ground product with the granularity of 0-200 meshes and more than 90%, adding a flotation agent, wherein the adding amount of the flotation agent is specifically that 0.4kg of the flotation agent is added into each ton of the concentrate A and the concentrate B, the concentration of flotation pulp is 32%, the pH value is 7, the temperature is 32 ℃, and then, the concentrate C and tailings C are obtained, and the concentrate C is the final concentrate.
Wherein, in the step (4), the flotation agent is tall oil, samara oil, lutein ester, water glass, carboxymethyl cellulose and a foaming agent in a weight ratio of 2.5:1.5:1:0.8:0.5:0.02, and the foaming agent is No. 2 oil and eucalyptus oil in a weight ratio of 1: 1.
Comparative example 1
The only difference from example 1 is that the flotation agent is tall oil, samara oil, lutein ester, water glass, carboxymethyl cellulose and No. 2 oil in a weight ratio of 3.5:0.5:1:0.3:1:0.08 (the total weight of the six is identical to example 1).
Comparative example 2
The only difference from example 1 was that the samara oil was replaced by an equal amount of peanut oil.
Comparative example 3
The only difference from example 1 is that the flotation agent does not contain pterocarya oil and lutein esters (the content of missing fractions is supplemented with tall oil, water glass, carboxymethyl cellulose and No. 2 oil in a weight ratio of 2:0.5:0.8: 0.01).
Crushing and dividing a raw ore analysis sample, preparing the sample, testing and analyzing to obtain the main components and the content of the Bayan obo iron-containing surrounding rock disclosed by the invention as shown in table 1.
TABLE 1 analysis of the main components of Bayan Obo iron-containing surrounding rock
| Composition (I) | TFe grade (%) | FeO content (%) | Content of ReO (%) |
| Content (wt.) | 17.00 | 7.40 | 6.10 |
As can be seen from the table above, the bayan obo iron ore magnetic surrounding rock has an iron grade of 17.00%, a ferrous iron content of 7.40%, a rare earth grade of 6.10%, and a calculated magnetic rate of 43.53%, and the whole ore has general magnetism, and has a lower iron grade, ferrous iron grade, and rare earth grade of the oxidizing surrounding rock compared with the magnetic surrounding rock.
Analyzing and calculating the yield, TFe grade, TFe recovery rate and FeO content of the corresponding ore obtained by the ore dressing method of each embodiment and comparative example;
wherein, the calculation formula is as follows:
multiplying the yield by (raw ore TFe grade-tailing TFe grade)/(concentrate TFe grade-tailing TFe grade) by 100%;
② the recovery rate of TFe is (concentrate TFe grade x (crude TFe grade-tailing TFe grade))/(crude TFe grade x (concentrate TFe grade-tailing TFe grade))/(crude TFe grade x 100%;
the results are tabulated in table 2.
TABLE 2 comprehensive results of Bayan Obo iron-containing wall rock test
As can be seen from table 2, the beneficiation method according to the present invention can obtain a concentrate with high yield and high iron grade, and when the flotation agent is changed in terms of components or content, the grade of the finally obtained concentrate, and the corresponding yield, recovery rate, etc. are all reduced, while part of the yield improvement is mainly caused by incomplete flotation.
Finally, it should be noted that the above-mentioned contents are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, and that the simple modifications or equivalent substitutions of the technical solutions of the present invention by those of ordinary skill in the art can be made without departing from the spirit and scope of the technical solutions of the present invention.
Claims (10)
1. The iron ore dressing method for the bayan obo iron-containing surrounding rock is characterized by comprising the following steps of: the method comprises the following steps:
(1) crushing and screening the Bayan Obo iron-containing surrounding rock ore sample into two size fractions of 0-15mm and 15-100 mm;
(2) sorting the 0-15mm size fraction by adopting a dry magnetic separation process to obtain concentrate A and tailings A;
(3) sorting the 15-100mm size fraction by adopting a photoelectric separation process to obtain concentrate B and tailings B;
(4) and mixing the concentrate A and the concentrate B, grinding to obtain a ground product, adding a flotation agent to obtain concentrate C and tailings C, wherein the concentrate C is the final concentrate.
2. An iron beneficiation process according to claim 1, characterized in that: the flotation agent in the step (4) comprises: tall oil, samara oil, lutein ester, water glass, carboxymethyl cellulose and foaming agent.
3. An iron beneficiation process according to claim 2, characterized in that: the weight ratio of the tall oil, the samara oil, the lutein ester, the water glass, the carboxymethyl cellulose and the foaming agent is 2-3:1-2:1:0.5-1:0.3-0.8: 0.01-0.05.
4. An iron beneficiation process according to claim 2, characterized in that: the foaming agent is one or more of No. 2 oil, camphor oil or eucalyptus oil.
5. An iron beneficiation process according to claim 4, characterized in that: the foaming agent is No. 2 oil and eucalyptus oil.
6. An iron beneficiation process according to claim 1, characterized in that: the adding amount of the flotation agent in the step (4) is specifically that 0.3-0.5kg of flotation agent is added to each ton of the concentrate A and the concentrate B.
7. An iron beneficiation process according to claim 1, characterized in that: the photoelectric separation process in the step (3) specifically comprises the following steps: scanning a part of raw ores by using an intelligent photoelectric separator to obtain an ore image, and setting different waste throwing rates from low to high through an intelligent identification algorithm until a preset concentrate index is obtained.
8. An iron beneficiation process according to claim 1, characterized in that: the granularity of the ore grinding in the step (4) is required to be more than 90 percent of 0-200 meshes.
9. An iron beneficiation process according to claim 1, characterized in that: the concentration of the flotation ore pulp after the flotation agent is added in the step (4) is 30-35%, the pH value is 7-8, and the temperature is 30-35 ℃.
10. An iron beneficiation process according to any one of claims 1 to 9, to produce a sorted concentrate.
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