WO2017161922A1 - 一种炼焦末中煤的解离再选工艺 - Google Patents

一种炼焦末中煤的解离再选工艺 Download PDF

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WO2017161922A1
WO2017161922A1 PCT/CN2016/109364 CN2016109364W WO2017161922A1 WO 2017161922 A1 WO2017161922 A1 WO 2017161922A1 CN 2016109364 W CN2016109364 W CN 2016109364W WO 2017161922 A1 WO2017161922 A1 WO 2017161922A1
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coal
product
coking
flotation
fed
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PCT/CN2016/109364
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English (en)
French (fr)
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桂夏辉
曹亦俊
邢耀文
杨自立
许雪红
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中国矿业大学
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Priority to AU2016399293A priority Critical patent/AU2016399293B2/en
Priority to RU2018103766A priority patent/RU2677339C1/ru
Priority to CA2993586A priority patent/CA2993586C/en
Publication of WO2017161922A1 publication Critical patent/WO2017161922A1/zh

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C21/00—Disintegrating plant with or without drying of the material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
    • B02C23/14—Separating or sorting of material, associated with crushing or disintegrating with more than one separator
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
    • 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
    • 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
    • B03B9/005—General arrangement of separating plant, e.g. flow sheets specially adapted for coal

Definitions

  • the invention relates to a dissociation re-selection process, in particular to a process for dissociating and reselecting coal in a coking tail used for recovering scarce coking coal resources.
  • the invention is based on the practical technology of coal crushing and re-selection in the end of coking, and the main purpose is to recover scarce coking coal resources.
  • Flotation, selective flocculation and oil agglomeration are the traditional technical means of sorting fine-grained coal slime, but only flotation technology is the most mature and has been industrialized on a large scale.
  • the flotation technology generally has a good sorting effect on the coal slurry of -0.5mm size.
  • the medium coal has its unique property. It is the low ash particles and the high ash particles in the process of raw coal formation with a small particle size.
  • the middle continuum formed by the inlay, the ash of the ash and the raw coal are relatively close.
  • a re-selection process based on dissociation of coal is provided, which overcomes the shortcomings of the traditional technology for recovering low-ash clean coal from medium coal, and fundamentally solves the existing scarce coking coal resources.
  • the dissociation and re-election process of coal in the end of coking can not be recycled.
  • the dissociation and re-selection process of coal in the coking end of the present invention has the following steps:
  • high-ash tail coal and coarse clean coal are produced, among which high-ash tail coal is discharged, and coarse coal is fed into short-body mill for grinding, and after coarse coal grinding product;
  • the coarsely refined coal milled product is fed into a three-product swirling grading sieve for classification operation. After the grading operation, the overflow of the three-product swirling grading sieve and the mixed product of the under-slipping product are fed into the pulping equipment for advance. Mixing, the bottom product of the three-product cyclone grading sieve and returning to the spiral sorting machine to perform the sorting cycle again;
  • the upper limit of the coal particle size is 13 mm; the upper limit of the crushing particle size is 1 mm; the short body mill is a rod mill or a self-grinding machine; and the flotation device is a flotation column.
  • a sorting process of coal in the end of coking based on the disintegration of coal is proposed, which realizes effective recovery of scarce coking coal resources: a.
  • the sorting density of the spiral sorting machine is higher, and it is the best.
  • a part of the high ash material that has been disassembled and dissociated can be pre-discarded to avoid understanding that the separated high ash material enters the mill, which greatly reduces the load of the mill, reduces energy consumption, and avoids high ash.
  • the contamination of the subsequent flotation operation after the material is ground; b.
  • the short-body grinding machine not only ensures that the medium and low ash materials are fully dissociated, but also does not produce over-grinding phenomenon which is not conducive to subsequent flotation operations; c, three
  • the product cyclone grading sieve has high classification efficiency, and plays a role in grading the milled product in the process. Its overflow and undersize all enter the flotation system, and the underflow returns to the spiral sorting machine to throw the tail again. On the one hand, it controls the particle size of the feed into the flotation system, so that the finer material that has been sufficiently dissociated enters the flotation operation, preventing it from continuously circulating in the system; on the other hand, it ensures the coarse particles that are not sufficiently dissociated. Return to the spiral sorting machine to continue tailing and dissociation to avoid entering the flotation system; d.
  • the sorting process proposed by the invention is simple, the technology is mature, the investment is low, the operating cost is low, and the economic benefit is remarkable.
  • Figure 1 is a flow chart showing the process of dissociation and reselection of coal in the coke tail of the present invention.
  • the coal dissociation re-selection process in the coke tail of the present invention has the following steps:
  • the final coal is fed into the reversible hammer crusher as a raw material for preliminary crushing and dissociation.
  • the upper limit of the coal size in the final coal is 13 mm; the crushed product after the preliminary crushing and dissociation is fed into the spiral sorting machine for pulping. After the slurry is adjusted, the spiral sorting machine is started for sorting, and the upper limit of the crushing particle size is 1 mm;
  • high-ash tail coal and coarse clean coal are produced, among which high-ash tail coal is discharged, and coarse coal is fed into short-body mill for grinding, and after coarse coal grinding Product, the short body mill is a rod mill or a self-grinding machine;
  • the coarsely refined coal milled product is fed into a three-product swirling grading sieve for classification operation. After the grading operation, the overflow of the three-product swirling grading sieve and the mixed product of the under-slipping product are fed into the pulping equipment for advance. Mixing, the bottom product of the three-product cyclone grading sieve and returning to the spiral sorting machine to perform the sorting cycle again;
  • the slurry in the pulping equipment is fed into the flotation equipment for sorting operation, the flotation equipment is a flotation column, and finally two products of flotation clean coal and flotation tail coal are obtained, and one end of the coking is completed.
  • the process of dissociation and re-election of coal is completed.
  • the coal 1 in the raw material is first fed into the reversible hammer crusher A through belt conveyor or the like for preliminary crushing and dissociation. After crushing, the crushed product 2 is fed to the spiral sorting machine after a certain pulping operation. B. After sorting by the spiral sorting machine B, two products of high ash tail coal 3 and coarse clean coal are produced, and the coarse clean coal 4 is ground into the rod mill C (or self-grinding mill) through a pipe or a chute.
  • the product 5 After grinding, the product 5 is inflowed by its own weight or pumped into the three-product cyclone grading sieve D for classification work, and the overflow of the three-product cyclone grading sieve D, the under-slung product 7 and the flotation agent 9 are brought into the pre-conditioning of the pulping equipment E.
  • the slurry (stirring drum, slurry preparation or slurry pretreatment), the bottom product 8 of the three-product cyclone sieving sieve D is returned to the spiral separator B for recirculation. After the slurry is adjusted, the slurry 10 is fed into the flotation column F for sorting operation, and finally two products of clean coal 11 and tail coal 12 are obtained.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Disintegrating Or Milling (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
  • Crushing And Grinding (AREA)

Abstract

一种高灰难选的炼焦末中煤的解离再选工艺，属于煤炭洗选领域。将原料末中煤(1)给入破碎设备(A)进行破碎，破碎后的产物进入螺旋分选机(B)分选，以抛除入料中的高密度部分物料，低密度物料给入短体磨机(C)，磨后产物给入三产品旋流分级筛(D)进行分级，分级筛(D)的溢流及筛下物进入浮选系统，底流返回螺旋分选机(B)进行再次分选、解离。其分选密度较高，螺旋抛尾避免了高灰颗粒进入磨机，既降低了磨机的负荷，又避免了高灰颗粒的粉碎对于精煤的污染。

Description

一种炼焦末中煤的解离再选工艺 技术领域
本发明涉及一种解离再选工艺，尤其适用于回收稀缺的炼焦煤资源使用的炼焦末中煤的解离再选工艺。
背景技术
本发明是基于炼焦末中煤破碎再选的实用技术，主要目的是回收稀缺的炼焦煤资源。
随着我国机械化采煤程度的不断提高、资源地质条件的继续恶化以及重介质选煤技术在选煤厂的广泛应用，我国入选煤质不断变差，分选过程中产生的细粒级的煤泥比例急剧增加，煤炭逐渐呈现“贫、细、杂”的特点，并呈继续恶化的趋势，其突出表现为中煤的含量大、灰分高并且可浮性较差，这部分中煤在分选过程中面临的突出问题就是精煤灰分超标而尾煤灰分偏低，细粒级煤泥处理过程中所遇到的问题给煤炭资源的高效分离与洁净化利用带来了极大的挑战。
浮选、选择性絮凝和油团聚等是分选细粒级煤泥的传统的技术手段，但只有浮选技术最成熟并且已经大规模产业化。浮选技术一般对于-0.5mm粒级的煤泥有较好的分选作用，然而中煤有其比较独特的性质，它是原煤形成过程中低灰颗粒和高灰颗粒以较小的粒度相互嵌布形成的中间连生体，灰分和原煤的灰分较为接近。若直接进入浮选，在浮选过程中这部分中煤若进入精煤则会构成精煤污染而进入尾煤则使得尾煤灰分偏低，所以不解离回收效果必然受到影响，而对中煤进行解离再选的工艺，如一段磨矿—浮选工艺则存在矸石过磨、磨后物料浮选精煤灰分超标等一些问题，所以中煤如何解离、如何分选是一个值得思考的问题，开发一种能高效回收中煤中的低灰分精煤的实用技术显得非常必要，这不但对细粒难选煤泥分选技术的进步有巨大的促进作用，而且对于稀缺炼焦煤资源二次回收利用具有重大的经济价值。
发明内容
针对上述技术的不足之处，提供一种基于中煤解离的再选工艺，克服了传统的从中煤中回收低灰精煤的技术的不足，从根本上解决了现存的稀缺炼焦煤资源无法回收再利用的炼焦末中煤的解离再选工艺。
为实现上述技术目的，本发明所述的炼焦末中煤的解离再选工艺，其步骤如下：
a.将末中煤作为原料给入可逆锤式破碎机进行初步破碎解离，将初步破碎解离后的破碎产品给入螺旋分选机进行调浆，调浆后启动螺旋分选机进行分选；
b.螺旋分选机分选后产出高灰分尾煤和粗精煤两种产品，其中高灰分尾煤排出，将粗精煤给入短体磨机进行磨矿，得到粗精煤磨后产品；
c.将粗精煤磨后产品给入三产品旋流分级筛进行分级作业，分级作业后将三产品旋流分级筛的溢流和筛下产品混合浮选药剂一起给入调浆设备进行预先调浆，三产品旋流分级筛分级后的底流产品返回螺旋分选机再次进行分选循环；
d.将调浆设备内的调浆给入浮选设备进行分选作业，最终得到浮选精煤和浮选尾煤两种产品，完成一次炼焦末中煤的解离再选过程。
所述的末中煤粒度上限是13mm；所述破碎粒度上限为1mm；所述的短体磨机为棒磨机或自磨机；所述的浮选设备为浮选柱。
有益效果：提出了基于中煤破碎解离的一种炼焦末中煤的分选工艺，实现了对稀缺炼焦煤资源的有效回收：a、螺旋分选机分选密度较高，在其最佳分选密度下可预先抛除一部分经破碎解离出的高灰分物料，避免了解离出的高灰分物料进入磨机，既大大减轻了磨机的负荷，降低了能耗，又避免了高灰分物料磨碎之后对后续浮选作业的污染；b、短体磨机既保证了中、低灰分的物料充分得到解离，又不至于产生不利于后续浮选作业的过磨现象；c、三产品旋流分级筛有着较高的分级效率，在流程中起到对磨后产品进行分级的作用，它的溢流和筛下物全部进入浮选系统，底流返回螺旋分选机再次抛尾。一方面它控制了进入浮选系统的入料粒度，使得已经充分解离的较细的物料进入浮选作业，防止其在系统中不断循环；另一方面保证了未得到充分解离的粗颗粒返回螺旋分选机继续抛尾、解离，以免进入浮选系统；d、本发明提出的分选工艺流程简单、技术成熟、投资少、运行费用低，经济效益显著。
附图说明
图1是本发明炼焦末中煤的解离再选工艺的流程框图。
图2是本发明炼焦末中煤的解离再选工艺的设备联系图，
图中：1-原料末中煤，2-破碎产品，3-螺旋分选机尾煤，4-粗精煤，5-磨后产品，6-分级溢流，7-分级筛下物，8-分级底流，9-浮选药剂，10-调浆后矿浆，11-浮选精煤，12-浮选尾煤，A-可逆锤式破碎机，B-螺旋分选机，C-短体磨机，D-三产品旋流分级筛，E-调浆设备，F-浮选柱。
具体实施方式
下面结合附图对本发明的具体实施方式进行进一步的说明：
如图1所示，本发明炼焦末中煤的解离再选工艺，其步骤如下：
a.将末中煤作为原料给入可逆锤式破碎机进行初步破碎解离，所述的末中煤粒度上限是13mm；将初步破碎解离后的破碎产品给入螺旋分选机进行调浆，调浆后启动螺旋分选机进行分选，所述破碎粒度上限为1mm；
b.螺旋分选机分选后产出高灰分尾煤和粗精煤两种产品，其中高灰分尾煤排出，将粗精煤给入短体磨机进行磨矿，得到粗精煤磨后产品，所述的短体磨机为棒磨机或自磨机；
c.将粗精煤磨后产品给入三产品旋流分级筛进行分级作业，分级作业后将三产品旋流分级筛的溢流和筛下产品混合浮选药剂一起给入调浆设备进行预先调浆，三产品旋流分级筛分级后的底流产品返回螺旋分选机再次进行分选循环；
d.将调浆设备内的调浆给入浮选设备进行分选作业，所述的浮选设备为浮选柱，最终得到浮选精煤和浮选尾煤两种产品，完成一次炼焦末中煤的解离再选过程。
如图2，首先将原料末中煤1通过皮带输送等给入可逆锤式破碎机A进行初步破碎解离，经破碎之后其破碎产品2经一定的调浆作业后给入到螺旋分选机B，经螺旋分选机B的分选之后产出高灰分尾煤3、粗精煤4两种产品，粗精煤4经管道或者溜槽进入棒磨机C(或自磨机)磨矿，磨后产品5靠自重流入或者泵入三产品旋流分级筛D进行分级作业，三产品旋流分级筛D的溢流6、筛下产品7和浮选药剂9一起进入调浆设备E预先调浆(搅拌桶、矿浆准备器或矿浆预处理器)，三产品旋流分级筛D的底流产品8返回螺旋分选机B再次循环。调浆后矿浆10给入浮选柱F进行分选作业，最终得到精煤11和尾煤12两种产品。
以上所述仅是对本发明的较佳实施方式而已，并非对本发明作任何形式上的限制，凡是依据本发明的技术实质对以上实施方式所做的任何简单修改、等同变化与修饰，均属于本发明技术方案的范围内。

Claims (5)

  1. 一种炼焦末中煤的解离再选工艺，其特征在于步骤如下：
    a.将末中煤作为原料给入可逆锤式破碎机进行初步破碎解离，将初步破碎解离后的破碎产品给入螺旋分选机进行调浆，调浆后启动螺旋分选机进行分选；
    b.螺旋分选机分选后产出高灰分尾煤和粗精煤两种产品，其中高灰分尾煤排出，将粗精煤给入短体磨机进行磨矿，得到粗精煤磨后产品；
    c.将粗精煤磨后产品给入三产品旋流分级筛进行分级作业，分级作业后将三产品旋流分级筛的溢流和筛下产品混合浮选药剂一起给入调浆设备进行预先调浆，三产品旋流分级筛分级后的底流产品返回螺旋分选机再次进行分选循环；
    d.将调浆设备内的调浆给入浮选设备进行分选作业，最终得到浮选精煤和浮选尾煤两种产品，完成一次炼焦末中煤的解离再选过程。
  2. 根据权利要求1所述的炼焦末中煤的解离再选工艺，其特征在于：所述的末中煤粒度上限是13mm。
  3. 根据权利要求1所述的炼焦末中煤的解离再选工艺，其特征在于：所述破碎粒度上限为1mm。
  4. 根据权利要求1所述的炼焦末中煤的解离再选工艺，其特征在于：所述的短体磨机为棒磨机或自磨机。
  5. 根据权利要求1所述的炼焦末中煤的解离再选工艺，其特征在于：所述的浮选设备为浮选柱。
PCT/CN2016/109364 2016-03-22 2016-12-12 一种炼焦末中煤的解离再选工艺 WO2017161922A1 (zh)

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Application Number Priority Date Filing Date Title
AU2016399293A AU2016399293B2 (en) 2016-03-22 2016-12-12 Process for liberating and separating slack middling obtained from coking
RU2018103766A RU2677339C1 (ru) 2016-03-22 2016-12-12 Способ высвобождения и обогащения угольной мелочи, полученной от коксования
CA2993586A CA2993586C (en) 2016-03-22 2016-12-12 Process for liberating and separating slack middling obtained from coking

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CN201610165914.2A CN105797831B (zh) 2016-03-22 2016-03-22 一种炼焦末中煤的解离再选工艺

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