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。 A flotation concentrate concentrate filtration dewatering technology field  The present invention relates to a slurry of water treatment technology, in particular to a dehydration process for flotation concentrate. 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, quality requirements, and strive to expand coal production enterprises in the coal washing capacity, while reducing product ash, take all effective measures to reduce the water content 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 coal mine, coal powder content in coal and slime tended to increase, making the flotation concentrate moisture on 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 affecting both 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。 But also to increase the content of slime slime water treatment and recycling slime dehydration, 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。 The slime water treatment and recycling is an important part of slime dehydration Coal production is to achieve solid-liquid separation, washing reduces the concentration of the key level to reach the closed water circulation. 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。  The most commonly used process of flotation concentrate dewatering of more single, only to the flotation concentrate dewatering equipment, or a combination of dehydration dewatering equipment used in accordance with the performance, as the settlement filtration dewatering centrifuge filter used in conjunction with were part of the water separation flotation concentrate in coarse and fine particle fraction, but because of the large energy consumption, low processing capacity and other reasons rarely used. 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 coal dewatering equipment is mainly filter, pressure filter, sedimentation filtration dewatering centrifuge machines, filter processing fine coal is better, but little processing power, difficult to adapt to large-scale coal preparation plant development and a lot of flotation concentrate dewatering requirements; Pressure Filter Change on feed particle size and concentration of the more sensitive when flotation concentrate composed of fine particles of size led or concentrations below 200g / L, its handling the ability to greatly decreased; sedimentation filtration dewatering centrifuge for maintenance capacity, because of higher water concentration in the filtrate flotation concentrate dewatering applications are 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 in the level of mechanization of coal mining, coal slime content more and more, and the development direction to 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 advances in technology, coal preparation, at the end of the block of coal dense medium separation, sorting coarse slime, slime flotation three-stage model developed rapidly sorting, flotation feed size towards the development of micro-fine, fine flotation fine coal particle size, low density, seriously restricting the pressurized filter processing capability in existing production systems, pressure filter processing coal capacity limitations often limit the normal operation of the flotation, if flotation increase the amount of coal, pressure filter processing capacity is not enough froth flotation concentrate often lead to spills, lost a lot of coal, but also affected the normal floating flotation concentrate, the loss of a large number of coal in coal floatation , so flotation concentrate dewatering problems not only related to the moisture coal products, and has affected the flotation links, therefore concentrate flotation concentrate dewatering filter 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  Technical Problem: The purpose of the present invention is to provide a simple process, high dewatering efficiency, low cost, good effect flotation concentrate dewatering processes.  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 solutions: flotation concentrate dewatering process of the present invention, preferred to concentrate flotation concentrate to the machine once dewatered, concentrated by the thickener underflow product to the pressure filter for secondary dehydration, thickener overflow into foam products to the water separator for separation, to obtain coal foam and aquatic products, aquatic products to enter the circulating water system, after the coal foam mixed with thickener underflow to the pressure filter dewatering, coal products and filtrate obtained through the pipeline and the filtrate was concentrated machine returns to continue enrichment operations.  所述浓缩机浓缩后的底流产品浓度控制在350g/L以上。  The thickener underflow product concentration in the concentrated control of 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。  beneficial effects: The present invention includes coal flotation concentrate operations, foam and water separation and flotation concentrate filtration operations jobs in 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。 Using slime enrichment equipment, and with foam and water separator, flotation concentrate will go through once concentrate thickener overflow concentrated into the foam and water separator, foam and water separator foam products and enrichment operations Mixed underflow to the pressure filter, foam and water separator aquatic use recycled water as Coal. 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。 Pressurized water to filter into the concentrated filtrate was concentrated machine, pressurized coal filter dewatering coal directly as the final 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。 Coal flotation concentrate filtration dewatering process to solve the flotation concentrate due to the low concentration of fine particle composition problems caused by dehydration, greatly increasing the pressure filter efficiency and processing capabilities. 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。 The main treatment for dehydration, especially slime flotation concentrate dewatering process has been solved because of flotation concentrate dewatering fine grain size, low concentrations caused difficulties, greatly improving the pressure filter processing capacity, improve the slime water system treatment process for flotation perfect provide a good external environment. 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  Figure 1 is a flotation concentrate dewatering process flow diagram of the present invention.  图2是本发明浮选精煤浓缩脱水设备结构示意图。  The present invention Figure 2 is a schematic structural view of flotation concentrate dewatering equipment is concentrated.  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。  Figure: thickener A, thickener underflow pump B, foam and water separator C, coal mixing drum D, coal pump E, pressure filter F; a flotation concentrate, thickener underflow 2, thickener overflow 3, 4 coal foam, recycled water 5, mixed coal and 6, pressure filter filtrate 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。 DETAILED DESCRIPTION  the following with reference to embodiments of the present invention will be further described: 1, flotation concentrate dewatering process of the invention: Preferred flotation concentrate will be fed into a machine for enrichment dewatered, concentrated by the thickener underflow product to the pressure filter for secondary dehydration, underflow product concentration was concentrated machine control concentrated in 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。 Since the overflow contains large bubbles and foam is difficult to remove, the foam must now be separated and water recycling coal, reducing the overflow of water concentration, so 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 products to the foam and water separator for separation, the foam and water separator isolated coal foam and aquatic products, aquatic products to enter the circulating water system can be used as recycled 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 froth and thickener underflow product mix to the pressure filter dewatering, coal products and filtrate obtained through the pipeline and the filtrate was concentrated machine returns to continue 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。  Figure 2, will be fed into a flotation concentrate thickener A, flotation concentrate a concentrated machine concentrated to give the A thickener underflow product thickener overflow 2 and 3, the thickener overflow 3 Since the inflow of foam and water separator C were foam and water separation process, the end product stream from the thickener underflow two pump B coal delivered to the mixing tank D; foam and water separator C will be separated into two thickener overflow coal froth 4 and circulating water 5, 4 gravity bubble coal bucket to concentrate thickener underflow D and 2 were mixed in coal coal pump 6 is fed to the pressure filter E F dehydration, recycled water directly as Coal 5 PREPARATION water use; mixed coal and 6 pressurized filter F dehydration after coal products 8 and Pressurized Filter filtrate 7, pressure filter and the filtrate was concentrated to 7 gravity machine 1; again and again, repeat the above steps until the completion of all enrichment operations.