CN102019227A - Lean hematite stage grinding and high intensity magnetism, gravity separation, negative ion reverse flotation technique - Google Patents

Lean hematite stage grinding and high intensity magnetism, gravity separation, negative ion reverse flotation technique Download PDF

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CN102019227A
CN102019227A CN2009101874473A CN200910187447A CN102019227A CN 102019227 A CN102019227 A CN 102019227A CN 2009101874473 A CN2009101874473 A CN 2009101874473A CN 200910187447 A CN200910187447 A CN 200910187447A CN 102019227 A CN102019227 A CN 102019227A
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flotation
concentrate
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coarse
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CN102019227B (en
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徐冬林
吴前锋
傅国辉
韦文杰
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Angang Group Mining Co Ltd
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Abstract

The present invention relates to a lean hematite stage grinding and high intensity magnetism, gravity separation, negative ion reverse flotation technique which includes the following steps of: feeding lean hematite for a first grinding after which a first classification is given; feeding effluence of the first classification under medium intensity magnetism and high intensity magnetism; feeding concentrates into a classification between coarse and fine grits and discarding ore tailings; after the coarse and fine grit classification, feeding the coarse grit products into a coarse snail and fine grit products to concentration; feeding the fine grits from the coarse snail into a fine snail, the fine grits of which are gravity separating fine grits; feeding tailings from the coarse and fine snails into a second classification, the effluence of which goes back to medium intensity magnetism; feeding concentrated underflows into a coarse flotation and discarding the effluents; feeding the fine grits from the coarse flotation into a fine flotation and the tailings into a first sweeping flotation; fine grits from the fine flotation being the fine grits of the flotation and returning the tailings back to the coarse flotation; returning the fine grits from the first sweeping flotation back to the coarse flotation and feeding the tailings into a second sweeping flotation; returning the fine grits from the second sweeping flotation back to the first sweeping flotation and feeding the tailings into a third sweeping flotation; returning the fine grits from the third sweeping flotation back to the second sweeping flotation and discarding the tailings. The technique reduces the work load of the preparation equipment and the cost of mineral separations.

Description

贫赤铁矿阶段磨矿及强磁-重选-阴离子反浮选工艺 Lean hematite stage grinding and strong magnetic-gravity separation-anion reverse flotation process

技术领域technical field

本发明涉及选矿技术领域，特别是一种贫赤铁矿阶段磨矿及强磁-重选-阴离子反浮选工艺。The invention relates to the technical field of ore dressing, in particular to a lean hematite stage grinding and strong magnetic-gravity separation-anion reverse flotation process.

背景技术Background technique

目前，我国贫赤铁矿多采用阶段磨矿、粗细分级、重选-强磁-阴离子反浮选工艺，一次分级溢流(-200目含量60％)经粗细分级作业分成粗、细两种产品。粗粒部分经粗螺、扫螺两段作业后，由弱磁、中磁抛尾；细粒部分由中磁、强磁抛尾。由于近年来贫赤铁矿入选品位持续下降，已由32％降至24％，因此增加了选矿设备的负荷，从而也增加了选矿成本。At present, my country's lean hematite mostly adopts stage grinding, coarse and fine classification, gravity separation-strong magnetic-anion reverse flotation process, and the primary classification overflow (-200 mesh content 60%) is divided into coarse and fine by coarse and fine classification. product. Coarse-grained part is thrown by weak and medium magnetic after two-stage operation of coarse snail and sweeping snail; the fine-grained part is thrown by medium and strong magnetic. As the selected grade of lean hematite has continued to decline in recent years, it has dropped from 32% to 24%, which increases the load on the mineral processing equipment, thereby also increasing the mineral processing cost.

发明内容Contents of the invention

本发明的目的是提供一种可降低选矿成本的贫赤铁矿阶段磨矿及强磁-重选-阴离子反浮选工艺。The purpose of the present invention is to provide a lean hematite stage grinding and strong magnetic-gravity separation-anion reverse flotation process that can reduce the cost of beneficiation.

本发明的目的是通过下述技术方案来实现的：The purpose of the present invention is achieved through the following technical solutions:

本发明的一种贫赤铁矿阶段磨矿及强磁-重选-阴离子反浮选工艺，其特征在于包括下述步骤：A kind of depleted hematite stage grinding and strong magnetic-gravity-anion reverse flotation process of the present invention is characterized in that comprising the following steps:

1)首先将品位22-25％，粒度为0-12毫米的贫赤铁矿给入一次磨矿，磨至一次分级溢流中-200目粒级含量达到60％，1) Firstly, the poor hematite with a grade of 22-25% and a particle size of 0-12 mm is fed into the primary grinding until the content of -200 mesh particle size reaches 60% in the primary classification overflow,

2)一次分级溢流给入中磁，中磁的精矿给入强磁，中磁的尾矿返回一次磨矿，2) A grading overflow is fed into the medium magnet, the concentrate of the medium magnet is fed into the strong magnet, and the tailings of the medium magnet are returned to a grinding,

3)强磁的精矿给入粗细分级，强磁的尾矿品位为＜9％，将此强磁尾矿抛弃，3) The strong magnetic concentrate is given into coarse and subdivided grades, the strong magnetic tailings grade is <9%, and the strong magnetic tailings are discarded,

4)粗细分级分成粗、细两种产品，-200目粒级含量45-55％的粗粒产品给入粗螺，-200目粒级含量＞90％的细粒产品给入浓缩，4) Coarse and fine grading is divided into two kinds of products, coarse and fine. The coarse-grained product with a particle size content of -200 mesh of 45-55% is fed into the coarse snail, and the fine-grained product with a particle size content of -200 mesh>90% is fed into concentration.

5)粗螺的精矿给入精螺，粗螺的尾矿给入二次分级和二次磨矿，5) The concentrate of the coarse snail is fed into the fine snail, and the tailings of the coarse snail are fed into the secondary classification and secondary grinding,

6)精螺的精矿为品位＞66％的重选精矿，精螺的尾矿进入二次分级和二次磨矿，6) The concentrate of Jingluo is gravity-selected concentrate with a grade>66%, and the tailings of Jingluo enter into secondary classification and secondary grinding,

7)二次分级溢流返回至中磁，7) The secondary grading overflow returns to the central magnetism,

8)细粒产品经浓缩后，浓度由20％提高到45％以上，浓缩的底流进入反浮选的粗浮选，浓缩的溢流抛弃，8) After the fine-grained product is concentrated, the concentration is increased from 20% to more than 45%, the concentrated underflow enters the rough flotation of reverse flotation, and the concentrated overflow is discarded.

9)粗浮选的精矿进入精浮选，粗浮选的尾矿进入一扫浮选，9) The concentrate of rough flotation enters fine flotation, and the tailings of rough flotation enters sweep flotation,

10)精浮选的精矿为浮选精矿，精浮选的尾矿返回至粗浮选，10) The concentrate of fine flotation is flotation concentrate, and the tailings of fine flotation are returned to rough flotation,

11)一扫浮选的精矿返回至粗浮选，一扫浮选的尾矿进入二扫浮选，11) The concentrated ore from the first-sweep flotation returns to the rough flotation, and the tailings from the first-sweep flotation enter the second-sweep flotation,

12)二扫浮选的精矿返回至一扫浮选，二扫浮选的尾矿进入三扫浮选，12) The concentrate from the second sweep flotation returns to the first sweep flotation, and the tailings from the second sweep flotation enter the third sweep flotation,

13)三扫浮选的精矿返回至二扫浮选，三扫浮选的尾矿抛弃，此浮选尾矿的品位为13-14％，13) The concentrate of the three-sweep flotation is returned to the second-sweep flotation, and the tailings of the three-sweep flotation are discarded. The grade of the flotation tailings is 13-14%.

14)重选精矿与浮选精矿合并为最终精矿，强磁尾矿、浓缩溢流与浮选尾矿合并为最终尾矿，此最终尾矿的品位为9-11％。14) Gravity separation concentrate and flotation concentrate are combined into final concentrate, and strong magnetic tailings, concentrated overflow and flotation tailings are combined into final tailings. The grade of the final tailings is 9-11%.

所述中磁采用中磁机，此中磁机的场强为3000-4000奥斯特。The medium magnetic machine adopts a medium magnetic machine, and the field strength of the magnetic machine is 3000-4000 Oersted.

所述强磁采用强磁机，强磁机的背景场强为12000-14000奥斯特。The strong magnet adopts a strong magnetic machine, and the background field strength of the strong magnetic machine is 12000-14000 Oersted.

本发明采用阶段磨矿、强磁-重选-阴离子反浮选新工艺，该工艺处理品位为24％的贫赤铁矿，可充分发挥阶段磨矿的优势，在粗磨情况下大量抛弃低品位脉石，大大降低了选矿设备的负荷，降低了选矿成本。其主要技术指标可达到精矿品位68％，尾矿品位10％，吨精矿成本480元。与现行的阶段磨矿、粗细分级、重选-强磁-阴离子反浮选工艺相比，技术指标基本相当，但吨精矿成本降低20元。The present invention adopts stage grinding, strong magnetic-gravity separation-anion reverse flotation new process, and this process treats poor hematite with a grade of 24%, can give full play to the advantages of stage grinding, and discard a large amount of low-grade hematite in the case of rough grinding Grade gangue greatly reduces the load on beneficiation equipment and the cost of beneficiation. Its main technical indicators can reach a concentrate grade of 68%, a tailings grade of 10%, and a ton of concentrate cost of 480 yuan. Compared with the current stage grinding, coarse and fine classification, gravity separation-strong magnetic-anion reverse flotation process, the technical indicators are basically the same, but the cost per ton of concentrate is reduced by 20 yuan.

附图说明Description of drawings

图1为本发明的工艺流程图。Fig. 1 is a process flow diagram of the present invention.

具体实施方式Detailed ways

下面结合附图中实施例说明本发明的具体实施方式。The specific implementation manner of the present invention will be described below in conjunction with the embodiments in the accompanying drawings.

如图1所示，本发明的一种贫赤铁矿阶段磨矿及强磁-重选-阴离子反浮选工艺，其特征在于包括下述步骤：As shown in Figure 1, a kind of depleted hematite stage grinding of the present invention and strong magnetic-gravity-anion reverse flotation process are characterized in that comprising the following steps:

1)首先将品位22-25％，粒度为0-12毫米的贫赤铁矿给入一次磨矿，磨至一次分级溢流中-200目粒级含量达到60％，1) Firstly, the poor hematite with a grade of 22-25% and a particle size of 0-12 mm is fed into the primary grinding until the content of -200 mesh particle size reaches 60% in the primary classification overflow,

2)一次分级溢流给入中磁，中磁的精矿给入强磁，中磁的尾矿返回一次磨矿，2) A grading overflow is fed into the medium magnet, the concentrate of the medium magnet is fed into the strong magnet, and the tailings of the medium magnet are returned to a grinding,

3)强磁的精矿给入粗细分级，强磁的尾矿品位为＜9％，将此强磁尾矿抛弃，3) The strong magnetic concentrate is given into coarse and subdivided grades, the strong magnetic tailings grade is <9%, and the strong magnetic tailings are discarded,

4)粗细分级分成粗、细两种产品，-200目粒级含量45-55％的粗粒产品给入粗螺，-200目粒级含量＞90％的细粒产品给入浓缩，4) Coarse and fine grading is divided into two kinds of products, coarse and fine. The coarse-grained product with a particle size content of -200 mesh of 45-55% is fed into the coarse snail, and the fine-grained product with a particle size content of -200 mesh>90% is fed into concentration.

5)粗螺的精矿给入精螺，粗螺的尾矿给入二次分级和二次磨矿，5) The concentrate of the coarse snail is fed into the fine snail, and the tailings of the coarse snail are fed into the secondary classification and secondary grinding,

6)精螺的精矿为品位＞66％的重选精矿，精螺的尾矿进入二次分级和二次磨矿，6) The concentrate of Jingluo is gravity-selected concentrate with a grade>66%, and the tailings of Jingluo enter into secondary classification and secondary grinding,

7)二次分级溢流返回至中磁，7) The secondary grading overflow returns to the central magnetism,

8)细粒产品经浓缩后，浓度由20％提高到45％以上，浓缩的底流进入反浮选的粗浮选，浓缩的溢流抛弃，8) After the fine-grained product is concentrated, the concentration is increased from 20% to more than 45%, the concentrated underflow enters the rough flotation of reverse flotation, and the concentrated overflow is discarded.

9)粗浮选的精矿进入精浮选，粗浮选的尾矿进入一扫浮选，9) The concentrate of rough flotation enters fine flotation, and the tailings of rough flotation enters sweep flotation,

10)精浮选的精矿为浮选精矿，精浮选的尾矿返回至粗浮选，10) The concentrate of fine flotation is flotation concentrate, and the tailings of fine flotation are returned to rough flotation,

11)一扫浮选的精矿返回至粗浮选，一扫浮选的尾矿进入二扫浮选，11) The concentrated ore from the first-sweep flotation returns to the rough flotation, and the tailings from the first-sweep flotation enter the second-sweep flotation,

12)二扫浮选的精矿返回至一扫浮选，二扫浮选的尾矿进入三扫浮选，12) The concentrate from the second sweep flotation returns to the first sweep flotation, and the tailings from the second sweep flotation enter the third sweep flotation,

13)三扫浮选的精矿返回至二扫浮选，三扫浮选的尾矿抛弃，此浮选尾矿的品位为13-14％，13) The concentrate of the three-sweep flotation is returned to the second-sweep flotation, and the tailings of the three-sweep flotation are discarded. The grade of the flotation tailings is 13-14%.

14)重选精矿与浮选精矿合并为最终精矿，强磁尾矿、浓缩溢流与浮选尾矿合并为最终尾矿，此最终尾矿的品位为9-11％。14) Gravity separation concentrate and flotation concentrate are combined into final concentrate, and strong magnetic tailings, concentrated overflow and flotation tailings are combined into final tailings. The grade of the final tailings is 9-11%.

所述中磁采用中磁机，此中磁机的场强为3000-4000奥斯特。The medium magnetic machine adopts a medium magnetic machine, and the field strength of the magnetic machine is 3000-4000 Oersted.

所述强磁采用强磁机，强磁机的背景场强为12000-14000奥斯特。The strong magnet adopts a strong magnetic machine, and the background field strength of the strong magnetic machine is 12000-14000 Oersted.

由于该工艺在粗磨情况下大量抛弃低品位脉石，大大降低了选矿设备的负荷，确保了低成本运行。以某选矿厂为例：该厂目前的精矿规模为230万吨位，以此精矿规模计算，年效益约为4600万元。Because this process discards a large amount of low-grade gangue in the case of rough grinding, it greatly reduces the load on the mineral processing equipment and ensures low-cost operation. Take a mineral processing plant as an example: the current concentrate scale of the plant is 2.3 million tons, and the annual benefit is about 46 million yuan based on this concentrate scale.

Claims (3)

1. a lean hematite stage grinding and strong magnet-gravity-anion reverse floatation technology is characterized in that comprising the steps:
1) at first with grade 22-25%, granularity is that the lean hematite of 0-12 millimeter feeds ore grinding one time, is milled to that-200 order grain size contents reach 60% in the scalping overflow,
2) the scalping overflow feeds middle magnetic, and the concentrate of middle magnetic feeds strong magnetic, and the mine tailing of middle magnetic returns ore grinding one time,
3) concentrate of strong magnetic feeds thickness grading, and the tailings grade of strong magnetic is＜9%, this strong magnetic tail ore deposit is abandoned,
4) thickness grading is divided into thick, thin two kinds of products, and the coarse grain product of-200 order grain size content 45-55% feeds thick spiral shell, and the particulate product of-200 order grain size content＞90% feeds concentrated,
5) concentrate of thick spiral shell feeds smart spiral shell, and the mine tailing of thick spiral shell feeds secondary classification and secondary grinding,
6) concentrate of smart spiral shell is the gravity concentrate of grade＞66%, and the mine tailing of smart spiral shell enters secondary classification and secondary grinding,
7) secondary classification overflow is back to middle magnetic,
8) the particulate product is after concentrating, and concentration is brought up to more than 45% by 20%, and the underflow that concentrates enters the rough floatation of reverse flotation, and concentrated overflow is abandoned,
9) concentrate of rough floatation enters cleaner flotation, and the mine tailing of rough floatation enters and sweeps flotation,
10) concentrate of cleaner flotation is a flotation concentrate, and the mine tailing of cleaner flotation is back to rough floatation,
11) concentrate that sweeps flotation is back to rough floatation, and the mine tailing that sweeps flotation enters two and sweeps flotation,
12) two concentrate of sweeping flotation are back to and sweep flotation, and two mine tailings of sweeping flotation enter three and sweep flotation,
13) three concentrate of sweeping flotation are back to two and sweep flotation, and three mine tailings of sweeping flotation are abandoned, and the grade of this flotation tailing is 13-14%,
14) gravity concentrate and flotation concentrate are merged into final concentrate, and strong magnetic tail ore deposit, concentrated overflow and flotation tailing are merged into true tailings, and the grade of this true tailings is 9-11%.
2. particulate iron tailings according to claim 1 selects technology again, it is characterized in that magnetic machine in the described middle magnetic employing, and field intensity of magnetic machine is the 3000-4000 oersted in this.
3. particulate iron tailings according to claim 1 selects technology again, it is characterized in that described strong magnetic adopts strong magnetic machine, and the background field intensity of strong magnetic machine is the 12000-14000 oersted.
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