一种浮选精煤浓缩过滤脱水工艺技术领域 本发明涉及煤泥水处理技术领域，尤其是一种用于浮选精煤的脱水工艺。 One kind of coal flotation concentrate filtration dehydration process Technical Field  The present invention relates to a technical field slime water, in particular to a dehydration process for coal flotation. 背景技术 为了满足煤炭市场多品种、高质量的要求，煤炭生产企业在力争扩大原煤入洗能力，降低产品煤灰分的同时，采取各种行之有效的措施降低产品的水分。  In order to meet the coal market variety and quality requirements, while coal production enterprises and strive to expand coal washing capacity, reduce product of coal ash, a variety of effective measures to reduce the moisture of the product. 但由于矿井采煤机械化程度的提高，原煤中粉末煤和煤泥的含量呈增加趋势，使得浮选精煤水分对总精煤水分的影响越来越大。 However, due to increased mechanization of coal mines, coal powder content of coal slime and it showed an increasing trend, making the flotation concentrate moisture impact on the total coal moisture is increasing. 精煤水分高既影响企业效益也浪费了社会资源增加了能源消耗，与节能减排的国策是不相符的。 High moisture coal not only affects business efficiency but also a waste of social resources increased energy consumption, and energy conservation policy is not consistent. 煤泥含量的增加也给煤泥水的处理及煤泥脱水回收、实现固液分离增加了难度。 Also to increase the content of slime slime water treatment and recycling slime dehydrated, solid-liquid separation more difficult. 而煤泥水处理及煤泥脱水回收是选煤厂生产的重要环节，是实现固液分离、降低洗水浓度达到一级洗水闭路循环的关键。 Slime slime dewatering and water treatment and recovery of coal preparation plant is an important part of the production is to achieve solid-liquid separation, washing reduces the concentration of key a closed water circuit is reached. 目前浮选精煤脱水的常用工艺较为单一，仅将浮选精煤给入脱水设备，或者根据脱水设备脱水性能进行组合使用，如将沉降过滤式离心脱水机与压滤机联合使用，分别分离浮选精煤中粗颗粒部分和细颗粒部分的水分，但由于系统能耗大，处理能力小等原因应用较少。  It Flotation Concentrate more single common process, only the flotation concentrate to a dewatering apparatus, or by using the combination of dewatering performance dewatering equipment, such as settling and filtration dewatering centrifuge filter in combination less reasons were isolated and the coarse particle fraction of the fine fraction water in flotation, but because of the large energy consumption, little processing power applications. 常规的精煤脱水设备主要是压滤机、加压过滤机、沉降过滤式离心脱水机等，压滤机处理细粒煤泥效果较好，但处理能力小，较难适应选煤厂大型化发展及大量浮选精煤脱水的要求；加压过滤机对入料粒度和浓度的变化较为敏感，当浮选精煤的粒度组成为细颗粒为主导或浓度低于200g/L时，其处理能力大大下降；沉降过滤式离心脱水机因维修量大、滤液水浓度高等原因在浮选精煤脱水应用方面也受到一定的局限。 Conventional dewatering equipment primarily coal filter, pressure filter, sedimentation, etc. Centrifuge, better fine coal filter processing, but the processing capacity of small, difficult to adapt the size of Coal development and large flotation Concentrate requirements; more sensitive to pressure changes in the filter feed size and concentration, when the flotation concentrate composition of fine particles of a particle size of less than or concentration leading 200g / L, which process capacity greatly reduced; centrifuge sedimentation due to maintenance of large machines, because of higher water concentration in the filtrate flotation concentrate dewatering applications also subject to certain limitations.  随着机械化采煤程度的提高，煤炭中煤泥的含量越来越多，且向者细粒的方向发展。  With the improvement of the degree of mechanization of coal mining, coal slime more and more content, and the development in the direction of those fines. 随着选煤技术的进步，块末煤重介分选、粗煤泥分选、煤泥浮选的三段式分选模式发展较快，浮选入料粒度朝微细粒发展，浮选精煤粒度细、浓度低，严重制约着加压过滤机设备的处理能力，在现有的生产系统中，加压过滤机处理精煤能力的局限常常限制了浮选作业的正常进行，若浮选的精煤出量加大，加压过滤机处理能力不够导致浮选精矿泡沫经常外溢，大量精煤损失，也影响了浮选精煤的正常浮出，大量精煤损失在浮选尾煤中，所以浮选精煤的脱水问题不仅涉及到精煤产品的水分，而且已经影响到浮选作业环节，因此浮选精煤浓缩过滤的脱水是现场急待解决的一大问题。 With the progress of technology of coal preparation, the last block of coal heavy medium separation, sorting coarse slime, coal flotation rapid development of three-sorting mode, the flotation feed size towards the development of micro-fine, fine flotation coal fine granularity, low concentration, severely restricts the pressure filter device processing power, in the conventional production systems, pressure limitation filter processing capability often limits coal flotation normal operation, if the flotation the amount of coal increased, pressure filter handling capacity is not enough froth flotation concentrates often lead to spills, loss of a lot of coal, but also affected the normal floating flotation concentrate, the loss of a large number of coal in coal floatation in, so the flotation concentrate dewatering problem involves not only moisture coal products, but also has affected the flotation links, therefore flotation concentrate concentrate filtration dehydration is a major problem in the field need to be solved. 发明内容 技术问题：本发明目的是提供了一种工艺简单，浓缩脱水效率高，低成本，效果好的浮选精煤浓缩脱水工艺。 SUMMARY OF THE INVENTION  Technical Problem: The purpose of the present invention is to provide a process for simple, high dewatering efficiency, low cost and good effect flotation concentrate dewatering process.  技术方案：本发明的浮选精煤浓缩脱水工艺，首选将浮选精煤给入浓缩机中进行一次脱水浓缩，经浓缩机浓缩后的底流产品给入加压过滤机进行二次脱水，浓缩机的溢流产品给入泡沫与水分离器中进行分离，得到精煤泡沫和水产品，将水产品给入循环水系统， 将精煤泡沫与浓缩机底流混合后给入加压过滤机脱水，得到精煤产品和滤液，通过管路将滤液返回浓缩机继续进行浓缩作业。  Technical Solution: flotation concentrate dewatering process of the present invention, the preferred flotation concentrate to concentrate into a machine for dewatering concentrated thickener underflow product was concentrated pressure to the secondary filter dehydrated thickener overflow into the foam products to the water separator and separation, to obtain a foam coal and fish, to the fish into the water circulation system, after the foam coal mixed with the thickener underflow to the pressure filter dehydrated to obtain coal product and a filtrate, and the filtrate was concentrated returned via line unit continues operating and concentrated.  所述浓缩机浓缩后的底流产品浓度控制在350g/L以上。 Underflow product concentration after the concentration  Control of the concentrate in 350g / L or more.  有益效果：本发明包括浮选精煤的浓缩作业、泡沫与水分离作业和浮选精煤过滤作业三部份。  Advantageous Effects: The present invention encompasses enrichment operations flotation concentrate, the foam separated from the water and the job the job on Filtration three parts. 采用煤泥浓缩设备，并配合泡沫与水分离器，将浮选精煤先经过浓缩机进行一次浓缩，浓缩后的溢流进入泡沫与水分离器，泡沫与水分离器的泡沫产品与浓缩作业的底流混合给入加压压滤机，泡沫与水分离器的水产品作为选煤厂循环水使用。 Devices using slime was concentrated, and water with a foam separator, the flotation concentrate to a concentrating machine and concentrated through an overflow into the foam after concentration with a water separator, and the foam product foam concentrate and water separator job underflow into the pressurized mixture to a filter, a foam with a water separator as fish circulating water preparation plant. 加压过滤机的滤液水给入浓缩机进行浓缩，加压过滤机脱水后的精煤直接作为最终精煤产品。 Pressure filter into the filtrate water to the concentrated thickener pressurized coal dewatering directly after the filter as a final clean coal product. 浮选精煤浓缩过滤脱水工艺，解决了浮选精煤因浓度低、粒度组成细而造成脱水难题，大大增加了加压过滤机的工作效率及处理能力。 Dehydration process flotation concentrate was filtered and concentrated, to solve the problem of dehydration due to the low concentration of flotation concentrate, the composition of the fine particle size resulting, greatly increasing the pressure filter efficiency and processing capability. 主要针对煤泥脱水处理尤其是浮选精煤的脱水处理，解决了浮选精煤因粒度细、浓度低而造成的脱水困难，大大提高了加压过滤机的处理能力，改善了煤泥水系统水处理过程，为浮选作业完善提供良好的外部环境。 Mainly for coal slurry dewatering process especially of flotation concentrate dewatering, dewatering flotation concentrate to solve the difficulties due to fine particle size, low concentration caused, greatly improving the processing capacity pressure filter, to improve the slime water system water treatment process, to provide a good external environment for the flotation perfect. 其工艺简单，投资少， 运行费用低，浓缩效果好。 The process is simple, low investment, low operating costs and good concentration effect. 附图说明 图1是本发明浮选精煤浓缩脱水工艺流程图。 BRIEF DESCRIPTION  FIG. 1 is a flotation concentrate dewatering process of the present invention FIG.  图2是本发明浮选精煤浓缩脱水设备结构示意图。  FIG. 2 is a schematic view of the present invention, fine coal flotation concentrate dewatering apparatus structure.  图中：浓缩机A，浓缩机底流泵B，泡沫与水分离器C，精煤混合桶D，精煤输送泵E，加压过滤机F ；浮选精煤1，浓缩机底流2，浓缩机溢流3、精煤泡沫4、循环水5、混合精煤6、加压过滤机滤液7、精煤产品8。  FIG: thickener A, thickener underflow pump B, and the foam water separator C, and D coal mixing vat, coal delivery pump E, F. Pressure Filter; a flotation concentrate, thickener underflow 2, the thickener overflow 3, 4 foam coal, recycled water 5, 6 coal mixture, pressing the filtrate of filter 7, 8 coal products. 具体实施方式 下面结合附图对本发明的实施例作进一步的描述：如图1所示，本发明的浮选精煤浓缩脱水工艺：首选将浮选精煤给入浓缩机中进行一次脱水浓缩，经浓缩机浓缩后的底流产品给入加压过滤机进行二次脱水，经浓缩机浓缩后的底流产品浓度控制在350g/L以上。 The preferred flotation concentrate to be concentrated into the machine time: DETAILED DESCRIPTION  The following embodiments in conjunction with the accompanying drawings of embodiments of the present invention are further described: 1, the flotation concentrate dewatering process of the present invention dehydrating concentrated thickener underflow product was concentrated to filter into the secondary pressure dewatering, the concentrated underflow product concentration is controlled machine concentrated 350g / L or more. 由于溢流中含有大量泡并沫难以消除，此时必须进行泡沫与水的分离，回收精煤，降低溢流水的浓度，使其作为循环水使用。 Because of the overflow and contains large amounts of foam is difficult to remove bubbles, the foam must now be separated and water recycling coal, reducing the concentration of water in the overflow, so that it is used as circulating water. 将浓缩机的溢流产品给入泡沫与水分离器中进行分离，经泡沫与水分离器分离得到精煤泡沫和水产品，将水产品给入循环水系统，可作为循环水使用。 The thickener overflow into foam products with a water separator for separation, by a foam with a water separator and a foam separated coal fish, the fish to the circulating water system, may be used as the circulating water. 将精煤泡沫与浓缩机底流产品混合后给入加压过滤机脱水，得到精煤产品和滤液，通过管路将滤液返回浓缩机继续进行浓缩作业。 After the coal with the foam mixture was concentrated underflow product infeed pressure filter dehydrated to obtain coal product and a filtrate, and the filtrate was returned via line concentrator continues enrichment operations.  如图2所示，将浮选精煤1给入浓缩机A，浮选精煤1经浓缩机A浓缩后得到浓缩机底流产品2和浓缩机溢流3，浓缩机溢流3自流入泡沫与水分离器C进行泡沫与水分离过程，底流产品2由浓缩机底流泵B输送至精煤混合桶D ；泡沫与水分离器C将浓缩机溢流2分离为精煤泡沫4和循环水5，精煤泡沫4自流至精矿桶D与浓缩机底流2混合，其混合精煤6被精煤输送泵E输送至加压过滤机F脱水，循环水5直接作为选煤厂选煤用水使用； 混合精煤6经加压过滤机F脱水后得到精煤产品8和加压过滤机滤液7，加压过滤机滤液7 自流至浓缩机1中；周而复始，重复上述步骤直至完成所有浓缩作业。  As shown, the flotation concentrate into 1 to 2 A thickener, a flotation concentrate was concentrated to obtain a concentrated underflow machine products 2 and 3 the A thickener overflow was concentrated, thickener overflow 3 water flows from the foam and froth separator C water separation process, the bottom product stream of the second pump B coal delivered to the mixing tank was concentrated underflow D; foam C with a water separator 2 the thickener overflow was isolated as a foam coal 4 5 and circulating water, coal foam concentrate to the tub 4 D gravity thickener underflow and 2 were mixed in a coal coal feed pump 6 is fed to the pressure filter E F dehydration, circulating water 5 directly as coal PREPARATION using water; 6 coal mixing the pressurized filter F after dehydration of the clean coal filter 8 and pressurized filtrate 7, pressure filter and the filtrate was concentrated to gravity 7 1 machine; cycle, repeating the above steps until completion all enrichment operations.