CN115921128A - Ore grinding-weak magnetic strong magnetic-coarse grain gravity separation regrinding and fine grain reverse flotation process - Google Patents
Ore grinding-weak magnetic strong magnetic-coarse grain gravity separation regrinding and fine grain reverse flotation process Download PDFInfo
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- CN115921128A CN115921128A CN202310010694.6A CN202310010694A CN115921128A CN 115921128 A CN115921128 A CN 115921128A CN 202310010694 A CN202310010694 A CN 202310010694A CN 115921128 A CN115921128 A CN 115921128A
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- flotation
- strong magnetic
- coarse
- concentrate
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- 238000005188 flotation Methods 0.000 title claims abstract description 50
- 230000005484 gravity Effects 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000000926 separation method Methods 0.000 title claims abstract description 27
- 239000012141 concentrate Substances 0.000 claims abstract description 38
- 239000004576 sand Substances 0.000 claims description 11
- 229910052595 hematite Inorganic materials 0.000 claims description 10
- 239000011019 hematite Substances 0.000 claims description 10
- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 claims description 10
- 238000007885 magnetic separation Methods 0.000 claims description 7
- 239000000725 suspension Substances 0.000 claims description 5
- 239000010419 fine particle Substances 0.000 claims description 4
- 230000002000 scavenging effect Effects 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims 2
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000011084 recovery Methods 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000005389 magnetism Effects 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 2
- 150000001450 anions Chemical class 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000011362 coarse particle Substances 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000011044 quartzite Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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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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Abstract
The invention relates to a process for grinding, weak magnetic strong magnetic, gravity separation and regrinding of coarse grains and reverse flotation of fine grains, which comprises a fine grain reverse flotation operation and is characterized in that the ore dressing process also comprises a section of closed circuit grinding classification operation, a continuous weak magnetic strong magnetic operation, a coarse and fine classification operation and a coarse grain gravity separation and regrinding operation. The invention has the advantages that: 1) The primary grading overflow product is subjected to strong magnetic pre-tailing discarding, so that qualified strong magnetic tailings with the yield of more than 20% can be discarded, and the production cost is reduced by about 5%; 2) A suspended vibration conical surface concentrating machine is adopted to improve the gravity concentration separation efficiency and obtain gravity concentrate with the grade of more than 68%; the secondary grading granularity is reduced to more than 80 percent of-0.038 mm content, so that the subsequent reverse flotation operation is facilitated, and the flotation concentrate with the grade of more than 66 percent is obtained; 3) And the large circulation of middlings is cancelled, the grinding amount of a secondary grinding machine is reduced, energy is saved, consumption is reduced, and stable operation of the process is facilitated.
Description
Technical Field
The invention belongs to the technical field of lean hematite ore dressing processes, and particularly relates to a process for grinding, weak magnetic strong magnetic, coarse grain gravity separation and regrinding and fine grain reverse flotation.
Background
The Anshan-type lean hematite takes hematite and false hematite as main materials, and is typical lean, fine and mixed hematite quartzite type iron ore. For this type of iron ore, there are two of the most common beneficiation processes currently used: the mineral separation process includes the steps of stage grinding, coarse and fine grading, coarse fraction gravity and magnetic separation, middling regrinding, coarse and fine fraction re-separation, fine fraction weak magnetic separation, strong magnetic separation, mixed magnetic separation and anion reverse flotation, and the process is shown in figure 1. The process flow has the problems that the coarse grinding products are not thrown off the tail in time, the technical indexes fluctuate due to the large circulation of the middling, and the like. The other ore dressing process is stage grinding, weak magnetic strong magnetic-floatation process. After the raw ore is ground twice, the magnetic tailings are thrown by using strong magnetism, the mixed concentrate of weak magnetism and strong magnetism is fed into flotation, flotation concentrate is selected, and then flotation tailings are discarded. The process has the problems that the final concentrate is not obtained in the magnetic separation operation, and the final concentrate is only formed by single flotation concentrate obtained in the flotation operation, so that the flotation operation has large treatment capacity, large consumption of flotation reagents and high cost.
Patent CN102302973A discloses an improved suspended vibration cone concentrator, suitable for a separation size of 100-5 microns, having a vibrating and rotating mechanism for the separation surface, the gradient of the cone of the separation surface being 3 ° to 15 °. The device has the advantages of low water consumption, high enrichment ratio and small separation granularity, and can be applied to the fine-particle-embedded lean hematite ore separation process to strengthen the regulation and control of the separation granularity, effectively improve the separation efficiency and increase the discarded qualified tailings, thereby reducing the treatment capacity of subsequent separation operation and improving the technical and economic indexes of a separation plant.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a process for grinding, weak magnetic strong magnetic separation, coarse grain gravity separation, regrinding and fine grain reverse flotation, wherein the ore dressing process is performed by strong magnetic tail discarding in advance before coarse and fine grading operation through weak magnetic strong magnetic operation, fine separation is performed by gravity separation and fine removal through a suspension vibration conical surface ore dressing machine, the major cycle of middling is cancelled, and the power-assisted flow stably runs, so that the purposes of enhancing the production controllability of an ore dressing plant, improving the separation efficiency and technical indexes and reducing the cost are achieved.
The purpose of the invention is realized by the following technical scheme:
the invention relates to a process for grinding ore, strongly magnetizing with weak magnetism, gravity separating and regrinding coarse grains and reverse flotation of fine grains, which comprises reverse flotation operation of fine grains, wherein the reverse flotation operation consists of a first-stage roughing operation, a first-stage concentrating operation and a third-stage scavenging operation; the beneficiation process is characterized by further comprising a first-stage closed-circuit ore grinding classification operation, a continuous weak magnetic strong magnetic operation, a coarse and fine classification operation and a coarse grain gravity separation regrinding operation, and the beneficiation process comprises the following specific steps of:
step 1, feeding lean hematite ore raw ore with the granularity of 12-0mm and the grade of 20% -30% into a first-stage closed-circuit grinding and classifying operation to obtain a primary classifying overflow product, feeding the primary classifying overflow product into a continuous weak magnetic machine and a continuous strong magnetic machine, discarding the strong magnetic tailings in advance, combining the weak magnetic concentrate and the strong magnetic concentrate, and feeding the mixture into a hydrocyclone for coarse and fine classifying operation to obtain a coarse grain sand setting product and a fine grain overflow product;
in the step 1, the granularity of the primary graded overflow product is-0.074 mm, and the content is more than 65%; the magnetic field intensity of the section of weak magnetic machine is more than 1000 Oe; the magnetic field intensity of the strong magnetic machine at the section is above 7000 Oe; the grade of the strong magnetic tailings is below 9%; the granularity of the fine grain overflow product is-0.074 mm, and the content of the fine grain overflow product is more than 75 percent; the content of the coarse grit sand setting product is more than 40 percent with the granularity of-0.074 mm.
Step 2, feeding the coarse-grained settled sand product into a continuous suspension vibration conical surface concentrator to perform primary-coarse-fine two-section gravity concentration to obtain gravity concentrate, merging two-section gravity tailings and feeding into a secondary classifier, feeding the secondary classification settled sand product into a two-section ball mill to regrind, returning the secondary ball mill ore discharge to the secondary classifier, merging the secondary classification overflow product with a fine-grained overflow product of coarse and fine classification operation, concentrating by a concentration big well and feeding into fine-grained reverse flotation operation to obtain flotation concentrate and flotation tailings, and discarding the flotation tailings in grade;
in step 2, the granularity of the secondary grading overflow product is-0.038 mm, the content of the secondary grading overflow product is more than 80%, and the grade of the gravity concentrate is more than 68%; the grade of the flotation concentrate is more than 66%. The grade of the flotation tailings is below 18%.
And 3, combining the gravity concentrate and the flotation concentrate into final concentrate, wherein the grade of the final concentrate reaches over 66 percent. The strong magnetic tailings and the flotation tailings are combined into final tailings, and the grade of the final tailings is below 14%.
Compared with the prior art, the invention has the advantages that:
1) The first closed circuit grinding classification-weak magnetic strong magnetic operation is carried out, the first classification overflow product is subjected to strong magnetic pre-tailing discarding before gravity separation operation and flotation operation, qualified strong magnetic tailings with the yield of more than 20% can be discarded, the treatment capacity of subsequent grinding classification and sorting operation is reduced, and the production cost is reduced by about 5%;
2) By adopting the suspended vibration conical surface concentrating machine to replace a spiral chute of the traditional equipment, the gravity concentration separation efficiency is improved, and gravity concentrate with the grade of more than 68% is obtained; the application of the suspension vibration conical surface ore separator also plays a role in reducing the secondary grading granularity, so that the granularity of a secondary grading overflow product reaches more than 80 percent of-0.038 mm, the subsequent reverse flotation process is favorable for stabilizing the grading index, the flotation concentrate with the grade of more than 66 percent is obtained, the concentrate grade is improved by more than 0.6 percent compared with the prior art, the tailing grade is reduced by more than 0.5 percent, and the lean hematite resource is better recycled;
3) The large circulation of middling is cancelled, the feeding amount of the secondary classifier is reduced to 60% from 80% of the original process, the grinding amount of the secondary mill is reduced, energy is saved, consumption is reduced, and stable operation of the process is facilitated.
Drawings
Fig. 1 is a flow chart of a traditional maghemite beneficiation process.
Fig. 2 is a flow chart of the beneficiation process of the present invention.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the drawings.
Examples
As shown in fig. 2, the process of grinding, weak magnetic strong magnetic force, gravity separation and regrinding of coarse particles and reverse flotation of fine particles comprises a reverse flotation operation of fine particles, wherein the reverse flotation operation comprises a first roughing operation, a first concentrating operation and three scavenging operations; the beneficiation process is characterized by further comprising a section of closed circuit ore grinding classification operation, a continuous weak magnetic strong magnetic operation, a coarse and fine classification operation and a coarse grain gravity separation regrinding operation, and the beneficiation process comprises the following specific steps:
step 1, feeding lean hematite raw ore with the granularity of 12-0mm and the grade of 28.6% into a first-stage closed circuit grinding grading operation to obtain a primary graded overflow product with the granularity of-0.074 mm and the content of 67%, and feeding the primary graded overflow product into a continuous weak magnetic machine and a continuous strong magnetic machine, wherein the magnetic field intensity of the weak magnetic machine is 1200Oe; the magnetic field intensity of the strong magnetic machine is 8000Oe; the strong magnetic tailings with the grade of 8.85% and the yield of 22.79% are removed by a strong magnetic machine in advance, and the weak magnetic concentrate and the strong magnetic concentrate are combined and then fed into a hydrocyclone for coarse and fine grading operation to obtain coarse grit sand products and fine overflow products; the coarse grit product has a grit size of 42% at-0.074 mm content, and the fine overflow product has a grit size of 84% at-0.074 mm content;
step 2, the coarse-grained settled sand product is fed into a continuous suspension vibration conical surface concentrator for primary-fine two-section gravity concentration with the concentration of 55% to obtain gravity concentrate with the grade of 68.36%, the yield of 11.99% and the recovery rate of 28.66%, the two-section gravity tailings are combined into secondary-graded ore feed and fed into a secondary classifier, the ratio of the secondary-graded ore feed is reduced from 80% of the original process to 60%, the secondary-graded settled sand product is fed into a two-section ball mill for regrinding, the secondary-section ball mill is used for ore discharge and returned to the secondary classifier to form a closed circuit, the secondary-graded overflow product with the granularity of-0.038 mm and the content of 81% is combined with the fine-grained overflow product of the coarse-fine grading operation, the secondary-graded ore deposit is concentrated by a large concentration well and fed into the fine-grained reverse operation to obtain the flotation concentrate with the grade of 66.98%, the yield of 18.48% and the recovery rate of 43.28%, the tailings are discarded, and the flotation tailings are carried out, the flotation has the tailings with the tailings grade of 12.86%, the tailings grade of the tailings of 46.74% and the recovery rate of 21.01%;
and 3, combining the gravity concentrate and the flotation concentrate into final concentrate, wherein the grade of the final concentrate is 67.52%, the yield is 30.47%, the recovery rate is 71.94%, the strong magnetic tailings and the flotation tailings are combined into final tailings, and the grade of the final tailings is 11.54%. The yield was 69.53% and the recovery was 28.06%.
Claims (4)
1. A kind of grinding-weak magnetic strong magnetic-gravity concentration regrinding of coarse grain, fine grain against flotation process, including the fine grain against flotation operation, characterized by that, this ore dressing process also includes one section of closed circuit grinding classification operation, continuous weak magnetic strong magnetic operation, thickness classification operation and coarse grain gravity concentration regrinding operation, the concrete step is as follows:
the method comprises the following steps:
step 1, feeding lean hematite raw ore with the granularity of 12-0mm and the grade of 20% -30% into a first-stage closed circuit grinding classification operation to obtain a primary classification overflow product, feeding the primary classification overflow product into a continuous weak magnetic machine and a continuous strong magnetic machine, discarding strong magnetic tailings in advance, combining weak magnetic concentrate and strong magnetic concentrate, and feeding the mixture into a hydrocyclone for coarse and fine classification operation to obtain a coarse grain sand setting product and a fine grain overflow product;
step 2, feeding the coarse-grained settled sand product into a continuous suspension vibration conical surface concentrator to perform primary-coarse-fine two-section gravity concentration to obtain gravity concentrate, merging two-section gravity tailings and feeding into a secondary classifier, feeding the secondary classification settled sand product into a two-section ball mill to regrind, returning the secondary ball mill ore discharge to the secondary classifier, merging the secondary classification overflow product with a fine-grained overflow product of coarse and fine classification operation, concentrating by a concentration big well and feeding into fine-grained reverse flotation operation to obtain flotation concentrate and flotation tailings, and discarding the flotation tailings in grade;
and 3, combining the gravity concentrate and the flotation concentrate into final concentrate, wherein the grade of the final concentrate reaches over 66 percent. The strong magnetic tailings and the flotation tailings are combined into final tailings, and the grade of the final tailings is below 14%.
2. The process of claim 1, wherein the reverse flotation operation comprises a first roughing operation, a first concentrating operation and a third scavenging operation.
3. The process of ore grinding, weak magnetic strong magnetic separation, coarse grain gravity separation, regrinding and fine grain reverse flotation according to claim 1, characterized in that in step 1, the primary classification overflow product has a particle size of-0.074 mm and a content of more than 65%; the magnetic field intensity of the section of weak magnetic machine is more than 1000 Oe; the magnetic field intensity of the strong magnetic machine at the section is above 7000 Oe; the grade of the strong magnetic tailings is below 9%; the granularity of the fine particle overflow product is-0.074 mm, and the content of the fine particle overflow product is more than 75 percent; the content of the coarse grit sand setting product is more than 40 percent with the granularity of-0.074 mm.
4. The process of claim 1, wherein in step 2, the secondary classification overflow product has a particle size of 80% or more at-0.038 mm content, and the gravity concentrate has a grade of 68% or more; the grade of the flotation concentrate is more than 66%. The grade of the flotation tailings is below 18%.
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| CN202310010694.6A CN115921128A (en) | 2023-01-05 | 2023-01-05 | Ore grinding-weak magnetic strong magnetic-coarse grain gravity separation regrinding and fine grain reverse flotation process |
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2023
- 2023-01-05 CN CN202310010694.6A patent/CN115921128A/en active Pending
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