WO2024040656A1 - 一种鞍山式磁赤铁矿分段磨矿、重—磁工艺流程 - Google Patents

一种鞍山式磁赤铁矿分段磨矿、重—磁工艺流程 Download PDF

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WO2024040656A1
WO2024040656A1 PCT/CN2022/119750 CN2022119750W WO2024040656A1 WO 2024040656 A1 WO2024040656 A1 WO 2024040656A1 CN 2022119750 W CN2022119750 W CN 2022119750W WO 2024040656 A1 WO2024040656 A1 WO 2024040656A1
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magnetic
tailings
concentrate
magnetic separation
grinding
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PCT/CN2022/119750
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French (fr)
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徐冬林
熊宏启
杨禹
刘双安
范喜杰
李万兴
韦文杰
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鞍钢集团矿业有限公司
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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
    • 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
    • B03B1/00—Conditioning for facilitating separation by altering physical properties of the matter to be treated

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  • the invention belongs to the field of mineral processing technology, and specifically relates to an Anshan-type maghemite segmented grinding and gravity-magnetic process flow.
  • Anshan type maghemite ore is an important type of iron ore in my country.
  • stage grinding coarse and fine separation
  • gravity separation-strong magnetic-anion reverse flotation process see Figure 1.
  • the primary classification overflow is divided into coarse and fine products through coarse and fine classification operations.
  • the coarse-grained part is selected by gravity separation concentrate through coarse snail, fine snail and sweep snail operations, and the tailings are thrown away by weak magnetic and medium magnetic fields. After concentration, it is fed into the reverse flotation operation to select the flotation concentrate and throw away the flotation tailings.
  • the tail is not discharged early, and the process load is heavy; second, it includes three processes: heavy, magnetic, and flotation, and the process is relatively complex; third, there is a large cycle of medium ore, which can easily cause fluctuations in process indicators.
  • the second is continuous grinding (staged grinding) and magnetic-floating process. After the raw ore is ground twice, the tailings are discarded using magnetic separation. The magnetic mixed concentrate is fed into flotation, the flotation concentrate is selected, and the flotation tailings are thrown away.
  • the problem with this process is that the concentrate is a single flotation concentrate, which consumes a lot of flotation reagents and costs a lot.
  • the published patent 201510320314.4 coarse particle pre-selection and magnetic-gravity separation process of micro-grain embedded mixed ore adopts semi-autogenous grinding, wet pre-selection, continuous grinding, weak and strong magnetism, fine screen and re-grinding, and strong magnetic fine and gravity separation process.
  • the wet pre-selection tailings are not recycled and are directly discarded
  • the ore is continuously ground to -325 mesh content of 90-95%, which consumes high energy
  • magnetic separation uses continuous magnetic separation,
  • the fine screen regrinding process, returning to the screen for secondary classification, has low sorting efficiency, and the large circulation of medium ore can easily cause fluctuations in process indicators.
  • the purpose of the present invention is to Provide an efficient, stable and easy-to-control low-grade Anshan-style maghemite segmented grinding and gravity-magnetic process flow to improve the resource utilization effect of ore and the technical and economic indicators of mineral processing enterprises.
  • An Anshan-type maghemite segmented grinding and gravity-magnetic process flow includes the following steps:
  • the Anshan-type maghemite ore with a grade of 25-30% is coarsely crushed and then subjected to a semi-autogenous grinding and screening system to obtain products with a particle size of 0-3mm, which are sorted by a weak magnetic machine and a strong magnetic machine in sequence.
  • the resulting concentrate is mixed and fed into the primary grinding and classification system, and the resulting tailings are screened and thrown away separately;
  • the second magnetic separation operation After passing through the primary grinding and classification system until the overflow particle size reaches -200 mesh and the content is more than 60%, the second magnetic separation operation is carried out, the obtained second magnetic separation concentrate is coarsely and subdivided, and the obtained second magnetic separation tailings are thrown away; After the magnetic separation concentrate is coarsely and subdivided, a coarse-grained sand settling product and a fine-grained overflow product are obtained.
  • the coarse-grained sand settling product is sequentially subjected to coarse snail sorting and fine snail sorting to obtain a gravity separation concentrate with a grade of more than 65%. ore as well as coarse spiral tailings and fine spiral tailings, and the coarse spiral tailings and the fine spiral tailings are mixed and then fed into a secondary grinding and classification system;
  • the overflow particle size reaches -325 mesh with a content of more than 90%, and is mixed with the fine-grained overflow product.
  • a magnetic separation with a grade of more than 65% is obtained.
  • Concentrate, as well as three magnetic separation tailings and four magnetic separation tailings; the three magnetic separation tailings and the fourth magnetic separation tailings are thrown away, and the magnetic separation concentrate is mixed with the gravity separation concentrate to obtain grade 65 % or more of concentrate.
  • the Anshan-type maghemite with a grade of 25-30% can also be other maghemite with a grade of 25-30%.
  • the Anshan-type maghemite ore is coarsely crushed to a particle size less than 300mm; the ore is sorted by a weak magnetic machine and a strong magnetic machine in sequence, and the resulting concentrate is mixed and fed into a primary grinding and classification system.
  • the obtained tailings are screened and thrown away respectively, which specifically includes: sorting by a weak magnetic machine to obtain weak magnetic concentrate and weak magnetic tailings, and the weak magnetic tailings being sorted by a strong magnetic machine to obtain strong magnetic concentrate and weak magnetic tailings.
  • Strong magnetic tailings, the weak magnetic concentrate and the strong magnetic concentrate are mixed and fed into a primary grinding and classification system; the strong magnetic tailings are screened to obtain coarse tailings products with a particle size of 0.3-3mm and fine-grained tailings with a particle size of 0-0.3mm.
  • the grade of the strong magnetic tailings is less than 8%.
  • the grade of the weakly magnetic concentrate and the strong magnetic concentrate after mixing is 35-45%.
  • the coarse-grained sand settling product is sequentially subjected to coarse snail sorting and fine snail sorting to obtain a gravity separation concentrate with a grade of more than 65%, as well as coarse snail tailings and fine snail tailings, specifically including :
  • the coarse-grained sand settling products are separated by coarse snails to obtain coarse snail concentrates and coarse snail tailings, and the coarse snail concentrates are separated by fine snails to obtain gravity separation concentrates and fine snails with a grade of more than 65%. tailings.
  • the grade of the second magnetic separation concentrate in step (2) is 45-55%, and the grade of the second magnetic separation tailings is less than 9%.
  • magnetic separation concentrates with a grade of more than 65% as well as three magnetic separation tailings and four magnetic separation tailings are obtained, specifically including:
  • the magnetic separation operation obtains three magnetic separation concentrates and three magnetic separation tailings.
  • the three magnetic separation concentrates are fed into the fourth magnetic separation operation to obtain magnetic separation concentrates and four magnetic separation tailings with a grade of more than 65%.
  • the grade of the coarse tailings product is 7-14%.
  • the coarse-grained sand settling product has a -200 mesh content of 30-50%, and the fine-grained overflow product has a -200 mesh content of more than 85%.
  • the fine-grained tailings, the second magnetic separation tailings, the third magnetic separation tailings and the fourth magnetic separation tailings are mixed into tailings with a grade of 8-10%.
  • the magnetic separator used in the four magnetic separation operations is an elutriation machine; the excitation current of the elutriation machine is above 1.0A.
  • the field strength of the weak magnetic machine is 0.15-0.2T; the field strength of the strong magnetic machine is more than 1T; the field strength of the second magnetic separation is 0.4-0.6T; The field strength of the three magnetic separations is 0.2-0.4T.
  • the grinding equipment of the semi-autogenous grinding-screening system includes a semi-autogenous grinding machine, and the screening equipment includes a linear screen; the screening equipment of the tailings in step (1) includes a dehydration screen; The grinding equipment of the primary grinding and classification system includes a ball mill; the grinding equipment of the secondary grinding and classification system includes a tower mill.
  • the aperture of the dewatering screen is 0.3-0.5 mm.
  • the present invention produces closed-circuit semi-autogenous grinding - 0-3mm products after screening, after primary grinding and classification - 200 mesh products with a content of more than 60% overflowing, and after secondary grinding and classification - 325 mesh products with a content of more than 90% overflowing
  • the products are tail-thrown after magnetic separation, which meets the requirement of being able to throw and throw early, reducing the load of subsequent operations and reducing costs.
  • the present invention cancels the flotation operation, reduces the use of chemicals, and is conducive to reducing costs.
  • the process only includes heavy and magnetic processes.
  • the process is relatively simple, easy to operate and control, and is conducive to stabilizing the process and indicators and reducing costs.
  • the coarse spiral tailings and fine spiral tailings are directly fed into the secondary grinding and classification system, so that the overflow product particle size is -325 mesh and the content is more than 90%, which directly dissociates most of the ore monomers,
  • the elimination of the large circulation of the medium ore is conducive to the stability of the process indicators, and the coarse and fine classification overflow and the overflow products of the secondary grinding and classification system are separated through high-efficiency magnetic separation equipment such as elutriation machines, which can improve the grade of the magnetic separation concentrate.
  • the present invention performs screening operations on strong magnetic tailings to form coarse-grained tailings products, which can be used as sand and gravel aggregates, concrete fine aggregates, railway ballast and cement raw materials, etc., thereby improving resource utilization.
  • Figure 1 is a flow chart of the traditional beneficiation process of maghemite ore in the prior art.
  • Figure 2 is a flow chart of the mineral processing process of the present invention.
  • the embodiment of the present invention is taken from a certain maghemite ore in Anshan City.
  • Step 1 After rough crushing, a certain maghemite ore in Anshan City with a grade of 25% is fed into the closed-circuit semi-autogenous grinding and screening operation, and the products under the screen (0-3mm) are fed into the weak magnetic machine operation (the field strength is 0.2T ), strong magnetic machine operation (field strength is 1.0T) for coarse particle separation, and the strong magnetic tailings with a grade of 7.07% and a yield of 31.34% are fed to the dehydration screen for screening.
  • the dehydration screen has a sieve hole of 0.3mm.
  • the upper product (0.3-3mm) is coarse-grained tailings with a grade of 10.28% and a yield of 8.16%.
  • the product under the screen (0-0.3mm) is fine-grained tailings with a grade of 5.94% and a yield of 23.18%.
  • the weak magnetic concentrate and the strong magnetic concentrate are mixed and fed into the primary grinding and classification system.
  • the overflow particle size reaches more than 60% of -200 mesh, and then fed into the secondary magnetic separation operation (field strength is 0.4T) for separation.
  • the discarded grade is 8.56%, with a yield of 24.38% of secondary magnetic separation tailings.
  • Step 2 Feed the second magnetic separation concentrate with a grade of 52.01% and a yield of 44.28% into the coarse and fine classification operation.
  • the coarse-grained sand settling product with a content of -200 mesh and 40% is separated by coarse snails and fine snails and has a grade of 66.18 %, the gravity separation concentrate with a yield of 4.70%, the coarse spiral tailings and fine spiral tailings are mixed and fed into the secondary closed-circuit grinding and classification system, so that the secondary classification overflow particle size reaches -325 mesh 93%, and the grade is 50.33%, yield 39.58%.
  • Step 3 Feed the mixed ore of the secondary graded overflow with a grade of 50.33% and a yield of 39.58% and the fine-grained overflow product with a -200 mesh content of more than 85% into the third magnetic separation operation (field strength is 0.4T), Four magnetic separation operations (excitation current is 1.0A, ascending water flow size is 1.1 ⁇ 10 3 L/h), the magnetic separation concentrate with a grade of 65.94% and a yield of 27.99% is selected, and the three magnetic separation concentrates with a grade of 12.18% are discarded. Separation tailings and four magnetic separation tailings with a grade of 14.66%.
  • Step 4 Gravity separation concentrate and magnetic separation concentrate are combined into the final concentrate, with a grade of 65.97%; the coarse-grained tailings screened out by the dehydration screen have a grade of 10.28%; the fine-grained tailings, secondary magnetic separation tailings, and third-grade tailings are The magnetic separation tailings and the fourth magnetic separation tailings are mixed into the final tailings, with a grade of 8.56%.
  • the concentrate grade is basically the same, and the tail product is reduced by 1- 1.5%, the concentrate cost is reduced by 10-20%.
  • the embodiment of the present invention is taken from a certain maghemite ore in Luan County.
  • the segmented grinding and gravity-magnetic process flow of a certain maghemite in Luanxian County of the present invention feeds a certain maghemite ore in Luanxian County with a grade of 30% into the separation process of the present invention.
  • carry out subsequent grinding and separation processing which specifically includes the following steps:
  • Step 1 After rough crushing, a certain maghemite ore in Luanxian County with a grade of 30% is fed into the closed-circuit semi-autogenous grinding and screening operation, and the products under the screen (0-3mm) are fed into the weak magnetic machine operation (the field strength is 0.15T ), strong magnetic machine operation (field strength is 1.0T) for coarse particle separation, and the strong magnetic tailings with a grade of 7.12% and a yield of 32.43% are fed to the dehydration screen for screening.
  • the dehydration screen has a sieve hole of 0.3mm.
  • the upper product (0.3-3mm) is coarse-grained tailings with a grade of 10.15% and a yield of 8.04%.
  • the product under the screen (0-0.3mm) is fine-grained tailings with a grade of 6.12% and a yield of 24.39%.
  • the weak magnetic concentrate and the strong magnetic concentrate are mixed and fed into the primary grinding and classification system.
  • the overflow particle size reaches more than 60% of -200 mesh, and then fed into the secondary magnetic separation operation (field strength is 0.6T) for separation.
  • the discarded grade is 8.33%, with a yield of 18.80% of secondary magnetic separation tailings.
  • Step 2 Feed the second magnetic separation concentrate with a grade of 53.57% and a yield of 48.77% into the coarse and fine classification operation.
  • the coarse-grained sand settling product with a content of -200 mesh and 40% is separated by coarse snails and fine snails and has a grade of 66.61 %, with a yield of 5.73% gravity separation concentrate.
  • the coarse spiral tailings and fine spiral tailings are mixed and fed into the secondary closed-circuit grinding and classification system, so that the secondary classification overflow particle size reaches -325 mesh 93%, and the grade is 51.18%, yield 39.72%.
  • Step 3 Feed the mixed ore of the secondary graded overflow with a grade of 51.18% and a yield of 39.72% and the fine-grained overflow product with a -200 mesh content of more than 85% into the third magnetic separation operation (field strength is 0.6T), Four magnetic separation operations (excitation current is 1.0A, ascending water flow size is 1.1 ⁇ 10 3 L/h), the magnetic separation concentrate with a grade of 65.58% and a yield of 31.98% is selected, and the three magnetic separation concentrates with a grade of 11.53% are discarded. Separation tailings and four magnetic separation tailings with a grade of 13.81%.
  • Step 4 The gravity separation concentrate and the magnetic separation concentrate are combined into the final concentrate, with a grade of 65.74%; the grade of the coarse tailings screened out by the dehydration screen is 10.15%; the fine-grained tailings, the secondary magnetic separation tailings, and the third The magnetic separation tailings and the fourth magnetic separation tailings are mixed into the final tailings, with a grade of 8.10%.
  • the concentrate grade is basically the same, and the tail product is reduced by 1- 1.5%, the concentrate cost is reduced by 10-20%.

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Abstract

本发明公开了一种原矿分段磨矿、重—磁工艺流程，属于选矿技术领域。原矿粗破后经半自磨-筛分系统作业，产品经弱磁机、强磁机、一次磨矿分级系统，所得尾矿筛分后分别抛除；精矿经一次磨矿分级系统、二磁选，所得精矿粗细分级为粗粒沉砂和细粒溢流，所得尾矿抛除；粗粒沉砂经粗螺、精螺分选，得到重选精矿和精螺尾矿，粗螺尾矿和精螺尾矿混合经二次磨矿分级系统作业，与细粒溢流混合，经三磁选和四磁选，得到磁选精矿、三磁选尾矿和四磁选尾矿；尾矿抛除，磁选精矿与重选精矿混合，得到品位65％以上的精矿。本发明取消了浮选作业，减少了药剂的使用，有利于降低成本，且流程只包括重、磁工艺，流程相对简单，便于操作和控制。

Description

一种鞍山式磁赤铁矿分段磨矿、重—磁工艺流程 技术领域
本发明属于选矿技术领域，具体涉及一种鞍山式磁赤铁矿分段磨矿、重—磁工艺流程。
背景技术
鞍山式磁赤铁矿石是我国重要的铁矿石类型。目前主要采用两种工艺生产：一是阶段磨矿、粗细分选、重选—强磁—阴离子反浮选工艺，见图1。一次分级溢流经粗细分级作业分成粗、细两种产品。粗粒部分经粗螺、精螺、扫螺作业选出重选精矿，由弱磁、中磁抛掉尾矿，中矿再磨后返回粗细分级；细粒部分由中磁、强磁抛尾后经浓缩后给入反浮选作业，选出浮选精矿，抛掉浮选尾矿。工艺流程存在一些不足：一是没有及早抛尾，流程负荷大；二是包括重、磁、浮3种工艺，流程较为复杂；三是中矿大循环，容易引起流程指标波动。
二是连续磨矿(阶段磨矿)、磁-浮工艺。原矿经过两次磨矿后，利用磁选抛弃尾矿，磁选混合精矿给入浮选，选出浮选精矿，抛掉浮选尾矿。此工艺存在问题是精矿是单一浮精，浮选药剂消耗大、成本高。
已经公开的专利201510320314.4微细粒嵌布混合矿粗粒预选、磁—重分选工艺，采用半自磨、湿式预选、连续磨矿、弱磁强磁、细筛再磨、强磁精重选工艺，存在以下问题：一是湿式预选尾矿没有回收，直接抛弃；二是湿式预选后直接连续磨矿至-325目含量90-95％，能耗高；三是磁选采用连段磁选、细筛再磨工艺，筛上返回二次分级，分选效率低，中矿大循环容易引起流程指标波动。
发明内容
为了解决现有技术存在的问题，针对现有低品位鞍山式磁赤铁矿工艺技术中，流程负荷大，没有及时抛尾和存在选矿工艺流程长、复杂难控制的问题，本发明的目的在于提供一种高效、稳定、便于控制的低品位鞍山式磁赤铁矿分段磨矿、重—磁工艺流程，提高矿石的资源利用效果和选矿企业的技术经济指标。通过增加半自磨-筛分系统及时抛掉低品位的粗粒尾矿，减少流程负荷，降低成本；同时采用一次磨矿分级系统、二次磨矿分级系统，使大部分矿石达到单体解离，减少因中矿大循环而引起流程指标波动的因素；取消了浮选作业，减少浮选药剂消耗，降低成本。本发明简化了选别流程，稳定了技术指标和提高了分选效率。
本发明的目的是通过下述技术方案实现的：
一种鞍山式磁赤铁矿分段磨矿、重—磁工艺流程，包括如下步骤：
(1)将品位25-30％的鞍山式磁赤铁矿粗破后经半自磨-筛分系统作业，得到粒度为0-3mm的产品，依次经弱磁机、强磁机分选，所得精矿混合后给入一次磨矿分级系统，所得尾矿筛分后分别抛除；
(2)经一次磨矿分级系统至溢流粒度达到-200目含量60％以上，进行二磁选作业，所得二磁选精矿进行粗细分级，所得二磁选尾矿抛除；所述二磁选精矿经粗细分级后，得到粗粒沉砂产品和细粒溢流产品，所述粗粒沉砂产品依次经粗螺分选、精螺分选，得到品位65％以上的重选精矿以及粗螺尾矿、精螺尾矿，所述粗螺尾矿和所述精螺尾矿混合后给入二次磨矿分级系统；
(3)经二次磨矿分级系统至溢流粒度达到-325目含量90％以上，与细粒溢流产品混合，经三磁选作业和四磁选作业，得到品位65％以上的磁选精矿，以及三磁选尾矿和四磁选尾矿；所述三磁选尾矿和四磁选尾矿抛除，所述磁选精矿与所述重选精矿混合，得到品位65％以上的精矿。
进一步地，上述技术方案中，所述品位25-30％的鞍山式磁赤铁矿还可以是品位为 25-30％的其他的磁赤铁矿。
进一步地，上述技术方案中，所述鞍山式磁赤铁矿粗破至粒度小于300mm；所述依次经弱磁机、强磁机分选，所得精矿混合后给入一次磨矿分级系统，所得尾矿筛分后分别抛除，具体包括：经弱磁机分选，获得弱磁精矿和弱磁尾矿，所述弱磁尾矿经强磁机分选，获得强磁精矿和强磁尾矿，所述弱磁精矿和所述强磁精矿混合后给入一次磨矿分级系统；所述强磁尾矿经筛分，得到粒度为0.3-3mm的粗粒尾砂产品和粒度为0-0.3mm的细粒尾矿。
进一步地，上述技术方案中，所述强磁尾矿的品位小于8％。
进一步地，上述技术方案中，所述弱磁精矿和所述强磁精矿混合后的品位为35-45％。
进一步地，上述技术方案中，所述粗粒沉砂产品依次经粗螺分选、精螺分选，得到品位65％以上的重选精矿以及粗螺尾矿、精螺尾矿，具体包括：所述粗粒沉砂产品经粗螺分选，得到粗螺精矿和粗螺尾矿，所述粗螺精矿经精螺分选，得到品位65％以上的重选精矿和精螺尾矿。
进一步地，上述技术方案中，步骤(2)中二磁选精矿品位45-55％，二磁选尾矿品位小于9％。
进一步地，上述技术方案中，所述经三磁选作业和四磁选作业，得到品位65％以上的磁选精矿，以及三磁选尾矿和四磁选尾矿，具体包括：经三磁选作业获得三磁选精矿和三磁选尾矿，所述三磁选精矿给入四磁选作业，得到品位65％以上的磁选精矿和四磁选尾矿。
进一步地，上述技术方案中，所述粗粒尾砂产品品位7-14％。
进一步地，上述技术方案中，所述粗粒沉砂产品为-200目含量30-50％，所述细粒溢流产品为-200目含量85％以上。
进一步地，上述技术方案中，所述细粒尾矿、所述二磁选尾矿、所述三磁选尾矿和所述四磁选尾矿混合为品位8-10％的尾矿。
进一步地，上述技术方案中，所述四磁选作业采用的磁选机为淘洗机；所述淘洗机的激磁电流为1.0A以上。
进一步地，上述技术方案中，所述弱磁机的场强为0.15-0.2T；所述强磁机的场强为1T以上；所述二磁选的场强为0.4-0.6T；所述三磁选的场强为0.2-0.4T。
进一步地，上述技术方案中，所述半自磨-筛分系统的磨矿设备包括半自磨机，筛分设备包括直线筛；步骤(1)所述尾矿的筛分设备包括脱水筛；所述一次磨矿分级系统的磨矿设备包括球磨机；所述二次磨矿分级系统磨矿设备包括塔磨机。
进一步地，上述技术方案中，所述脱水筛的孔径为0.3-0.5mm。
发明有益效果：
1)本发明分别在闭路半自磨-筛分后0-3mm产品、一次磨矿分级后-200目含量60％以上溢流产品及二次磨矿分级后-325目含量90％以上溢流产品磁选后进行抛尾，符合能抛早抛要求，减轻后续作业负荷，降低成本。
2)本发明取消了浮选作业，减少了药剂的使用，有利于降低成本，且流程只包括重、磁工艺，流程相对简单，便于操作和控制，有利于流程、指标稳定和降低成本。
3)本发明中将粗螺尾矿和精螺尾矿直接给入到二次磨矿分级系统，使溢流产品粒度为-325目含量90％以上，直接使大部分矿石单体解离，取消中矿大循环，有利于流程指标稳定，且通过淘洗机等高效磁选设备对粗细分级溢流和二次磨矿分级系统溢流产品进行选别，可提高磁选精矿品位。
4)本发明对强磁尾矿进行筛分作业，形成粗粒尾砂产品，可用做砂石骨料、混凝土细骨料、铁路道渣和水泥原料等，提高了资源利用率。
附图说明
图1为现有技术中磁赤铁矿传统选矿工艺流程图。
图2为本发明的选矿工艺流程图。
具体实施方式
下述非限定性实施例可以使本领域的普通技术人员更全面地理解本发明，但不以任何方式限制本发明。
实施例1
本发明实施例取自鞍山市某磁赤铁矿矿石。
如图2所示，本发明的鞍山市某磁赤铁矿分段磨矿、重—磁工艺流程，将品位为25％的鞍山市某磁赤铁矿给入到本发明的选别工艺中，进行后续磨矿选别处理，具体包括下述步骤：
步骤1、将品位25％的鞍山市某磁赤铁矿粗破后给入闭路半自磨-筛分作业，筛下产品(0-3mm)给入到弱磁机作业(场强为0.2T)、强磁机作业(场强为1.0T)进行粗粒选别，将品位为7.07％，产率为31.34％的强磁尾矿给入脱水筛筛分，脱水筛筛孔0.3mm，筛上产品(0.3-3mm)为粗粒尾砂产品，品位为10.28％，产率为8.16％，筛下产品(0-0.3mm)为细粒尾矿，品位为5.94％，产率为23.18％。弱磁精矿、强磁精矿混合给入一次磨矿分级系统，溢流粒度达到-200目60％以上，给入二磁选作业(场强为0.4T)进行选别，抛掉品位为8.56％，产率为24.38％的二磁选尾矿。
步骤2、将品位为52.01％、产率为44.28％的二磁选精矿给入到粗细分级作业，-200目含量40％的粗粒沉砂产品经粗螺、精螺选出品位为66.18％，产率为4.70％的重选精矿，粗螺尾矿、精螺尾矿混合给入二次闭路磨矿分级系统作业，使二次分级溢流粒度达到-325目93％，品位为50.33％、产率为39.58％。
步骤3、将品位为50.33％、产率为39.58％的二次分级溢流与-200目含量85％以上的细粒溢流产品混合矿给入三磁选作业(场强为0.4T)、四磁选作业(激磁电流为 1.0A，上升水流大小为1.1×10 3L/h)，选出品位为65.94％，产率为27.99％的磁选精矿，抛弃品位为12.18％的三磁选尾矿和品位为14.66％的四磁选尾矿。
步骤4、重选精矿、磁选精矿合为最终精矿，品位达到65.97％；脱水筛筛分出的粗粒尾砂品位为10.28％；细粒尾矿、二磁选尾矿、三磁选尾矿、四磁选尾矿混合为最终尾矿，品位为8.56％。
本工艺与阶段磨矿、粗细分选、重选—强磁—阴离子反浮选工艺及连续磨矿(阶段磨矿)、磁-浮工艺相比，精矿品位基本相当，尾品降低1-1.5％，精矿成本降低10-20％。
实施例2
本发明实施例取自滦县某磁赤铁矿矿石。
如图2所示，本发明的滦县某磁赤铁矿分段磨矿、重—磁工艺流程，将品位为30％的滦县某磁赤铁矿给入到本发明的选别工艺中，进行后续磨矿选别处理，具体包括下述步骤：
步骤1、将品位30％的滦县某磁赤铁矿粗破后给入闭路半自磨-筛分作业，筛下产品(0-3mm)给入到弱磁机作业(场强为0.15T)、强磁机作业(场强为1.0T)进行粗粒选别，将品位为7.12％，产率为32.43％的强磁尾矿给入脱水筛筛分，脱水筛筛孔0.3mm，筛上产品(0.3-3mm)为粗粒尾砂产品，品位为10.15％，产率为8.04％，筛下产品(0-0.3mm)为细粒尾矿，品位为6.12％，产率为24.39％。弱磁精矿、强磁精矿混合给入一次磨矿分级系统，溢流粒度达到-200目60％以上，给入二磁选作业(场强为0.6T)进行选别，抛掉品位为8.33％，产率为18.80％的二磁选尾矿。
步骤2、将品位为53.57％、产率为48.77％的二磁选精矿给入到粗细分级作业，-200目含量40％的粗粒沉砂产品经粗螺、精螺选出品位为66.61％，产率为5.73％的重选精矿，粗螺尾矿、精螺尾矿混合给入二次闭路磨矿分级系统作业，使二次分级溢流粒度达到-325目93％，品位为51.18％、产率为39.72％。
步骤3、将品位为51.18％、产率为39.72％的二次分级溢流与-200目含量85％以上的细粒溢流产品混合矿给入三磁选作业(场强为0.6T)、四磁选作业(激磁电流为1.0A，上升水流大小为1.1×10 3L/h)，选出品位为65.58％，产率为31.98％的磁选精矿，抛弃品位为11.53％的三磁选尾矿和品位为13.81％的四磁选尾矿。
步骤4、重选精矿、磁选精矿合为最终精矿，品位达到65.74％；脱水筛筛分出的粗粒尾砂品位为10.15％；细粒尾矿、二磁选尾矿、三磁选尾矿、四磁选尾矿混合为最终尾矿，品位为8.10％。
本工艺与阶段磨矿、粗细分选、重选—强磁—阴离子反浮选工艺及连续磨矿(阶段磨矿)、磁-浮工艺相比，精矿品位基本相当，尾品降低1-1.5％，精矿成本降低10-20％。
上述实施例只是用于对本发明的举例和说明，而非意在将本发明限制于所描述的实施例范围内。此外本领域技术人员可以理解的是，本发明不局限于上述实施例，根据本发明的教导还可以做出更多种的变型和修改，这些变型和修改均落在本发明所要求保护的范围内。

Claims (9)

  1. 一种鞍山式磁赤铁矿分段磨矿、重—磁工艺流程，其特征在于，包括如下步骤：
    (1)将品位25-30％的鞍山式磁赤铁矿粗破后经半自磨-筛分系统作业，得到粒度为0-3mm的产品，依次经弱磁机、强磁机分选，所得精矿混合后给入一次磨矿分级系统，所得尾矿筛分后分别抛除；
    (2)经一次磨矿分级系统至溢流粒度达到-200目含量60％以上，进行二磁选作业，所得二磁选精矿进行粗细分级，所得二磁选尾矿抛除；所述二磁选精矿经粗细分级后，得到粗粒沉砂产品和细粒溢流产品，所述粗粒沉砂产品依次经粗螺分选、精螺分选，得到品位65％以上的重选精矿以及粗螺尾矿、精螺尾矿，所述粗螺尾矿和所述精螺尾矿混合后给入二次磨矿分级系统；
    (3)经二次磨矿分级系统至溢流粒度达到-325目含量90％以上，与细粒溢流产品混合，经三磁选作业和四磁选作业，得到品位65％以上的磁选精矿，以及三磁选尾矿和四磁选尾矿；所述三磁选尾矿和四磁选尾矿抛除，所述磁选精矿与所述重选精矿混合，得到品位65％以上的精矿。
  2. 根据权利要求1所述的一种鞍山式磁赤铁矿分段磨矿、重—磁工艺流程，其特征在于，所述品位25-30％的鞍山式磁赤铁矿还可以是品位为25-30％的其他的磁赤铁矿。
  3. 根据权利要求1所述的一种鞍山式磁赤铁矿分段磨矿、重—磁工艺流程，其特征在于，所述鞍山式磁赤铁矿粗破至粒度小于300mm；所述依次经弱磁机、强磁机分选，所得精矿混合后给入一次磨矿分级系统，所得尾矿筛分后分别抛除，具体包括：经弱磁机分选，获得弱磁精矿和弱磁尾矿，所述弱磁尾矿经强磁机分选，获得强磁精矿和强磁尾矿，所述弱磁精矿和所述强磁精矿混合后给入一次磨矿分级系统；所述强磁尾矿经筛分，得到粒度为0.3-3mm的粗粒尾砂产品和粒度为0-0.3mm的细粒尾矿。
  4. 根据权利要求1所述的一种鞍山式磁赤铁矿分段磨矿、重—磁工艺流程，其特 征在于，所述粗粒沉砂产品依次经粗螺分选、精螺分选，得到品位65％以上的重选精矿以及粗螺尾矿、精螺尾矿，具体包括：所述粗粒沉砂产品经粗螺分选，得到粗螺精矿和粗螺尾矿，所述粗螺精矿经精螺分选，得到品位65％以上的重选精矿和精螺尾矿。
  5. 根据权利要求1所述的一种鞍山式磁赤铁矿分段磨矿、重—磁工艺流程，其特征在于，所述经三磁选作业和四磁选作业，得到品位65％以上的磁选精矿，以及三磁选尾矿和四磁选尾矿，具体包括：经三磁选作业获得三磁选精矿和三磁选尾矿，所述三磁选精矿给入四磁选作业，得到品位65％以上的磁选精矿和四磁选尾矿。
  6. 根据权利要求1所述的一种鞍山式磁赤铁矿分段磨矿、重—磁工艺流程，其特征在于，所述粗粒沉砂产品为-200目含量30-50％，所述细粒溢流产品为-200目含量85％以上。
  7. 根据权利要求3所述的一种鞍山式磁赤铁矿分段磨矿、重—磁工艺流程，其特征在于，所述细粒尾矿、所述二磁选尾矿、所述三磁选尾矿和所述四磁选尾矿混合为品位8-10％的尾矿。
  8. 根据权利要求1所述的一种鞍山式磁赤铁矿分段磨矿、重—磁工艺流程，其特征在于，所述四磁选作业采用的磁选机为淘洗机；所述淘洗机的激磁电流为1.0A以上；所述弱磁机的场强为0.15-0.2T；所述强磁机的场强为1T以上；所述二磁选的场强为0.4-0.6T；所述三磁选的场强为0.2-0.4T。
  9. 根据权利要求1所述的一种鞍山式磁赤铁矿分段磨矿、重—磁工艺流程，其特征在于，所述半自磨-筛分系统的磨矿设备包括半自磨机，筛分设备包括直线筛；步骤(1)所述尾矿的筛分设备包括脱水筛；所述一次磨矿分级系统的磨矿设备包括球磨机；所述二次磨矿分级系统的磨矿设备包括塔磨机。
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CN108993757A (zh) * 2018-07-05 2018-12-14 鞍钢集团矿业有限公司 磁铁矿半自磨预选-阶段磨矿-细筛塔磨磁选工艺
CN110694789A (zh) * 2019-11-18 2020-01-17 安徽马钢矿业资源集团有限公司 一种磁铁矿的选矿方法
CN111013811A (zh) * 2019-12-23 2020-04-17 鞍钢集团矿业有限公司 一种处理鞍山式铁矿石的粗细分选-重-磁联合选矿工艺
CN114405675A (zh) * 2021-12-31 2022-04-29 玉溪大红山矿业有限公司 一种铁矿石混合矿选矿工艺

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