CN106423533A - Poor hematite high-pressure roller grinding, roughness and fineness classification and reselection-magnetic separation-reverse flotation technology - Google Patents
Poor hematite high-pressure roller grinding, roughness and fineness classification and reselection-magnetic separation-reverse flotation technology Download PDFInfo
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- 238000005188 flotation Methods 0.000 title claims abstract description 23
- 238000000227 grinding Methods 0.000 title claims abstract description 11
- 229910052595 hematite Inorganic materials 0.000 title claims abstract description 11
- 239000011019 hematite Substances 0.000 title claims abstract description 11
- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 title claims abstract description 11
- 239000012141 concentrate Substances 0.000 claims abstract description 34
- 238000000034 method Methods 0.000 claims abstract description 22
- 238000007885 magnetic separation Methods 0.000 claims abstract description 13
- 230000005484 gravity Effects 0.000 claims abstract description 11
- 238000012216 screening Methods 0.000 claims abstract description 6
- 239000004576 sand Substances 0.000 claims description 3
- 150000001450 anions Chemical class 0.000 claims description 2
- 239000002245 particle Substances 0.000 abstract description 22
- 238000000926 separation method Methods 0.000 abstract description 9
- 230000008901 benefit Effects 0.000 abstract description 5
- 238000003801 milling Methods 0.000 abstract description 4
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract description 3
- 239000011707 mineral Substances 0.000 abstract description 3
- 238000010408 sweeping Methods 0.000 description 9
- 239000000203 mixture Substances 0.000 description 2
- 238000000498 ball milling Methods 0.000 description 1
- 238000010332 dry classification Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000002000 scavenging effect Effects 0.000 description 1
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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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Abstract
本发明涉及一种贫赤铁矿高压辊磨、粗细分级、重—磁—反浮选工艺，其特征在于：将粒度为300～0mm的原矿粒度经粗破、中破筛分作业后，产品粒度为35～0mm，经高压辊磨和风力分级系统后，获得粒度‑200目含量60%～65%的产品，将该产品给入粗细分级旋流器分级、重选、磁选和离心机选别作业，获得品位为67.5%～67.8%，产率为31.33%～32%的最终精矿及品位为10.5%～11.5%、产率为67.5～68.5%的最终尾矿。本发明的优点是；由于本发明采用“高压辊磨—粗细分级系统”，代替细破作业和两段磨矿作业，直接就可获得粒度‑200目含量60%‑65%的产品，在简化工艺流程的同时可大幅度降低选矿成本，经济效益显著。
The invention relates to a process of high-pressure roller milling, coarse and fine classification, and gravity-magnetic-reverse flotation of lean hematite, which is characterized in that: after coarse crushing and intermediate crushing and screening of raw ore with a particle size of 300-0 mm, the product The particle size is 35-0mm. After the high-pressure roller mill and wind classification system, the product with a particle size of -200 mesh and a content of 60%-65% is obtained, and the product is fed into a coarse and fine grading cyclone for classification, gravity separation, magnetic separation and centrifuge Sorting operation, the final concentrate with a grade of 67.5% to 67.8% and a yield of 31.33% to 32% and the final tailings with a grade of 10.5% to 11.5% and a yield of 67.5 to 68.5% were obtained. The advantage of the present invention is; because the present invention adopts "high-pressure roller mill-coarse fine classification system", instead of fine crushing operation and two-stage grinding operation, the product with particle size-200 mesh content of 60%-65% can be obtained directly. At the same time of technological process, the cost of mineral processing can be greatly reduced, and the economic benefits are remarkable.
Description
技术领域technical field
本发属于选矿技术领域，尤其涉及一种贫赤铁矿高压辊磨、粗细分级、重—磁—反浮选工艺。The invention belongs to the technical field of mineral processing, and in particular relates to a process of high-pressure roller milling, coarse and fine classification, and gravity-magnetic-reverse flotation of lean hematite.
背景技术Background technique
贫赤铁矿通常采用“三段破碎,阶段磨矿，粗细分级，中矿再磨，重选—磁选—阴离子反浮选”工艺流程选别。即贫赤铁矿石300～0mm，经过粗破、中破、细破筛分后，形成粒度达到-12mm含量90%以上的产品，该产品经过一段磨矿、一次分级形成的闭路磨矿后，一次分级溢流粒度达到-200目含量55～60%，经粗细分级旋流器分级后，分级旋流器沉砂给入粗选螺旋溜槽选别，粗选螺旋溜槽的精矿给入精选螺旋溜槽选别，精选螺旋溜槽的精矿为重选精矿；粗选螺旋溜槽的尾矿给入一段扫弱磁、一段扫中磁选别，扫中磁的尾矿为重选尾矿；精选螺旋溜槽的尾矿与扫弱磁精矿、扫中磁精矿合并为中矿，给入二段球磨机进行再磨，粒度达到-200目含量82～86%后，返回粗细分级旋流器。粗细分级旋流器溢流经一段弱磁、—强磁选别后，弱磁选精矿与强磁选精矿形成混磁精矿给入阴离子反浮选作业，经过一段粗选、一段精选、三段扫选作业，获得浮选精矿，重选精矿与反浮选精矿合为最终精矿，品位66%—67%；扫中磁尾矿、强磁尾矿、浮选尾矿合为最终尾矿11%-12%。Lean hematite is usually sorted by the process of "three-stage crushing, stage grinding, coarse and fine classification, middle ore regrinding, gravity separation-magnetic separation-anion reverse flotation". That is, lean hematite ore 300-0mm, after rough crushing, medium crushing and fine crushing and screening, a product with a particle size of -12mm and a content of more than 90% is formed. , the primary classification overflow particle size reaches -200 mesh and the content is 55-60%. The spiral chute is selected for separation, and the concentrate of the selected spiral chute is the gravity separation concentrate; the tailings of the roughing spiral chute are fed into a section of weak magnetic sweep and a section of mid-magnetic separation, and the tailings of the mid-magnetic sweep are gravity separation tailings ore; the tailings of the selected spiral chute are combined with the weak magnetic concentrate and the medium magnetic concentrate to form the middle ore, which is sent to the second-stage ball mill for regrinding. Cyclone. After the overflow of coarse and fine graded hydrocyclones passes through a stage of weak magnetic separation and strong magnetic separation, the weak magnetic separation concentrate and strong magnetic separation concentrate form a mixed magnetic concentrate and are fed into anion reverse flotation operation. Sweeping and three-stage scavenging operations to obtain flotation concentrates, gravity-separation concentrates and reverse flotation concentrates are combined into final concentrates with a grade of 66%-67%; The tailings are combined into 11%-12% of the final tailings.
原矿经粗破、中破、细破筛分后，粒度达到-12mm90%以上，再采用“阶段磨矿,粗细分级，中矿再磨，重选—磁选—阴离子反浮选”工艺流程选别，流程中采用三段破碎、一段磨矿作业，存在破碎作业、磨矿作业段数多，流程较长，工艺复杂的弊端，导致选矿成本高。After coarse crushing, medium crushing and fine crushing and screening, the raw ore has a particle size of over -12mm90%, and then adopts the process of "stage grinding, coarse and fine classification, middle ore regrinding, gravity separation - magnetic separation - anion reverse flotation" In addition, three stages of crushing and one stage of grinding are used in the process, which has the disadvantages of many crushing and grinding stages, long process and complicated process, resulting in high beneficiation costs.
发明内容Contents of the invention
本发明确目的是提供一种能减少了细破作业、一段磨矿作业、简化流程结构，实现短流程选别，大幅度降低选矿成本的贫赤铁矿高压辊磨、粗细分级、重—磁—反浮选工艺。The specific purpose of the present invention is to provide a lean hematite high-pressure roller mill, coarse and fine grading, heavy-magnetic —Reverse flotation process.
为了克服现有技术的缺点，本发明采用了下述技术方案。In order to overcome the shortcomings of the prior art, the present invention adopts the following technical solutions.
本发明的，贫赤铁矿高压辊磨、粗细分级、重—磁—反浮选工艺，其特征在于：包括下列步骤：将粒度为300～0mm的原矿粒度经粗破、中破筛分作业后，产品粒度为35～0mm，经高压辊磨和风力分级系统后，获得粒度-200目含量60%～65%的产品，将该产品给入粗细分级旋流器分级作业，粗细分级旋流器沉砂给入粗选螺旋溜槽、精选螺旋溜槽、扫弱磁、扫中磁选别，精选螺旋溜槽的精矿为重选精矿，品位66.7%～66.85%、产率17.3%～17.5%；精选螺旋溜槽的尾矿与扫弱磁选的精矿、扫中磁精矿合为中矿给入再磨机再磨，粒度达到-200目含量83～86%，再磨后产品返回粗细分级旋流器，扫中磁尾矿品位9.55%～9.85%、产率27.5～28.5%，粗细分级旋流器溢流给入弱磁、强磁、阴离子反浮选工艺中，浮选精矿品位68.5%～68.95%、产率14.5%～15.5%，强磁尾矿品位8.3%～8.8%，产率28%～29浮选尾矿品位16%～18%、产率10.5%～11.5%。重选精矿与浮选精矿合为最终精矿，品位67.5%～67.85%、产率31.5%～32.5%；扫中磁尾矿与强磁尾矿、浮选尾矿合为最终尾矿，品位10.50%～11%、产率67.5%～67.85%。The process of high-pressure roller milling, coarse and subdivision classification, gravity-magnetic-reverse flotation of lean hematite of the present invention is characterized in that it includes the following steps: the raw ore with a particle size of 300-0 mm is subjected to coarse crushing and intermediate crushing and screening operations Finally, the particle size of the product is 35-0mm. After passing through the high-pressure roller mill and the wind classification system, a product with a particle size of -200 mesh and a content of 60% to 65% is obtained. The sand settling device is fed into the roughing spiral chute, the selected spiral chute, the weak magnetic sweep and the middle magnetic separation. The concentrate in the selected spiral chute is heavy separation concentrate, with a grade of 66.7% to 66.85% and a yield of 17.3% to 17.5%; the tailings from the selected spiral chute, the concentrate from sweeping weak magnetic separation, and the sweeping magnetic concentrate are combined into medium ore and fed to the regrinder for regrinding. The particle size reaches -200 mesh and the content is 83-86%. After regrinding The product is returned to the coarse and fine-grained cyclone, the grade of the swept magnetic tailings is 9.55%-9.85%, and the yield is 27.5-28.5%. Concentrate grade 68.5%～68.95%, yield 14.5%～15.5%, strong magnetic tailings grade 8.3%～8.8%, yield 28%～29 Flotation tailings grade 16%～18%, yield 10.5% ~11.5%. Gravity separation concentrate and flotation concentrate are combined to form the final concentrate, with a grade of 67.5% to 67.85% and a yield of 31.5% to 32.5%; sweeping magnetic tailings, strong magnetic tailings and flotation tailings are combined to form final tailings , grade 10.50% ~ 11%, yield 67.5% ~ 67.85%.
本发明的优点是；The advantages of the present invention are;
由于本发明采用了“高压辊磨—分级系统”，代替细破作业和一段磨矿作业，直接就可获得粒度-200目含量60%-65%的产品，在简化工艺流程的同时可大幅度降低选矿成本，经济效益显著。在背景技术中，一段球磨磨矿后的产品是采用水力旋流器进行分级，需施行高压切线给矿，根据受到离心力的不同，矿粒是按粒度和密度进行分级的；而高压辊磨—风力分级，是矿石经过高压辊磨后，利用风力、重力进行干式分级，优化了分级产品粒度组成。通常选矿工艺中，中破作业产品可给入高压辊磨作业，产品粒度在3～0mm，给入球磨作业；而本发明工艺中，“高压辊磨—风力分级”形成一体设备，一方面在替代细破作业和一段磨矿作业的同时，优化了产品粒度组成，有利于选别指标的提高。Since the present invention adopts the "high-pressure roller mill-grading system", instead of the fine crushing operation and one-stage grinding operation, the product with a particle size of -200 mesh and a content of 60%-65% can be obtained directly, which can greatly improve the production process while simplifying the process flow. The cost of beneficiation is reduced, and the economic benefit is remarkable. In the background technology, the products after the first stage of ball milling are classified by hydrocyclones, and high-pressure tangential feeding is required. According to the different centrifugal forces, the ore particles are classified according to particle size and density; while high-pressure roller mills— Wind classification is to use wind and gravity to carry out dry classification after the ore passes through the high-pressure roller mill, and optimize the particle size composition of the classified products. Usually in the mineral processing process, the product of the medium crushing operation can be fed into the high-pressure roller mill, and the product particle size is 3-0mm, and it can be fed into the ball mill. While replacing the fine crushing operation and one-stage grinding operation, it optimizes the particle size composition of the product, which is conducive to the improvement of the sorting index.
附图说明Description of drawings
图1为原贫赤铁矿 “三段破碎,阶段磨矿，粗细分级，中矿再磨，重选—磁选—阴离子反浮选”的工艺流程图。Figure 1 is the process flow chart of "three-stage crushing, stage grinding, coarse and fine classification, middle ore regrinding, gravity separation-magnetic separation-anion reverse flotation" of the original lean hematite ore.
图2为本发明贫赤铁矿高压辊磨、粗细分级、重—磁—反浮选工艺流程图。Fig. 2 is a process flow chart of high-pressure roller milling, coarse and fine classification, and gravity-magnetic-reverse flotation of lean hematite in the present invention.
具体实施方式detailed description
下面结合附图对本发明作进一步说明。The present invention will be further described below in conjunction with accompanying drawing.
如图2所示，本发明的贫赤铁矿高压辊磨、粗细分级、重—磁—反浮选工艺，其特征在于：包括下列步骤：将粒度为300～0mm的原矿粒度经粗破、中破筛分作业后，产品粒度为35～0mm，经高压辊磨和风力分级系统后，获得粒度-200目含量60%～65%的产品，将该产品给入粗细分级旋流器分级作业，粗细分级旋流器沉砂给入粗选螺旋溜槽、精选螺旋溜槽、扫弱磁、扫中磁选别，精选螺旋溜槽的精矿为重选精矿，品位66.7%～66.85%、产率17.3%～17.5%；精选螺旋溜槽的尾矿与扫弱磁选的精矿、扫中磁精矿合为中矿给入再磨机再磨，粒度达到-200目含量83～86%，再磨后产品返回粗细分级旋流器，扫中磁尾矿品位9.55%～9.85%、产率27.5～28.5%，粗细分级旋流器溢流给入弱磁、强磁、阴离子反浮选工艺中，浮选精矿品位68.5%～68.95%、产率14.5%～15.5%，强磁尾矿品位8.3%～8.8%，产率28%～29浮选尾矿品位16%～18%、产率10.5%～11.5%。重选精矿与浮选精矿合为最终精矿，品位67.5%～67.85%、产率31.5%～32.5%；扫中磁尾矿与强磁尾矿、浮选尾矿合为最终尾矿，品位10.50%～11%、产率67.5%～67.85%。As shown in Figure 2, the lean hematite high-pressure roller mill, coarse and fine classification, gravity-magnetic-reverse flotation process of the present invention is characterized in that it includes the following steps: coarsely crushing the raw ore particle size of 300-0mm, After the medium crushing and screening operation, the particle size of the product is 35-0mm. After passing through the high-pressure roller mill and the wind classification system, the product with a particle size of -200 mesh and a content of 60%-65% is obtained, and the product is fed into the coarse and fine grading cyclone for grading. The coarse and fine graded cyclone settling sand is fed into the roughing spiral chute, selected spiral chute, sweeping weak magnetic field, and sweeping magnetic separation. The yield is 17.3%~17.5%; the tailings from the selected spiral chute are combined with the concentrate from sweeping weak magnetic separation and the sweeping magnetic concentrate into the middle ore, which is sent to the regrinder for regrinding, with a particle size of -200 mesh and a content of 83~86 %, after regrinding, the product returns to the coarse and fine-grained cyclone, the grade of the swept magnetic tailings is 9.55%-9.85%, and the yield is 27.5-28.5%. In the beneficiation process, the flotation concentrate grade is 68.5%-68.95%, the yield is 14.5%-15.5%, the strong magnetic tailings grade is 8.3%-8.8%, and the yield is 28%-29. The flotation tailings grade is 16%-18%. , Yield 10.5% to 11.5%. Gravity separation concentrate and flotation concentrate are combined to form the final concentrate, with a grade of 67.5% to 67.85% and a yield of 31.5% to 32.5%; sweeping magnetic tailings, strong magnetic tailings and flotation tailings are combined to form final tailings , grade 10.50% ~ 11%, yield 67.5% ~ 67.85%.
本发明的工艺流程取消了原三段破碎中的细破作业和一段磨矿作业，采用高压辊磨和风力分级系统直接就可获得粒度-200目含量60%-65%的产品，简化了流程结构，实现了短流程选别，大幅度降低了选矿成本，经济效益显著。The technical process of the present invention cancels the fine crushing operation and the first-stage grinding operation in the original three-stage crushing, and directly obtains products with a particle size of -200 mesh and a content of 60%-65% by using a high-pressure roller mill and a wind classification system, which simplifies the process The structure realizes short-process sorting, greatly reduces the cost of ore dressing, and has remarkable economic benefits.
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| CN107199115A (en) * | 2017-07-04 | 2017-09-26 | 鞍钢集团矿业有限公司 | A kind of Treatment of Middling technique |
| CN108970803A (en) * | 2018-09-20 | 2018-12-11 | 鞍钢集团矿业有限公司 | A kind of floating process integration of the magnetic-weight-sorting the hematite containing ferric carbonate |
| CN108970802A (en) * | 2018-09-20 | 2018-12-11 | 鞍钢集团矿业有限公司 | A kind of floating combined mineral dressing technology of the stage grinding-magnetic-weight-sorting hematite |
| CN113953080A (en) * | 2021-09-01 | 2022-01-21 | 鞍钢集团北京研究院有限公司 | Beneficiation method for mixed iron ore |
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| CN113953080B (en) * | 2021-09-01 | 2024-04-19 | 鞍钢集团北京研究院有限公司 | A method for beneficiating mixed iron ore |
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