WO2007082492A1 - Procédé d'épuration de haute efficacité pour le recyclage d'eau de suspension de charbon - Google Patents

Procédé d'épuration de haute efficacité pour le recyclage d'eau de suspension de charbon Download PDF

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WO2007082492A1
WO2007082492A1 PCT/CN2007/000236 CN2007000236W WO2007082492A1 WO 2007082492 A1 WO2007082492 A1 WO 2007082492A1 CN 2007000236 W CN2007000236 W CN 2007000236W WO 2007082492 A1 WO2007082492 A1 WO 2007082492A1
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water
coal slurry
hardness
water quality
slurry water
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PCT/CN2007/000236
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English (en)
French (fr)
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Jiongtian Liu
Mingqing Zhang
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China University Of Mining And Technology
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Priority to AU2007207277A priority Critical patent/AU2007207277B2/en
Publication of WO2007082492A1 publication Critical patent/WO2007082492A1/zh

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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
    • C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5209—Regulation methods for flocculation or precipitation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/10—Nature of the water, waste water, sewage or sludge to be treated from quarries or from mining activities
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/05—Conductivity or salinity
    • C02F2209/055—Hardness

Definitions

  • the present invention relates to an efficient clarification method for circulating coal slurry water, which is particularly suitable for use in industrial wastewater treatment in which it is difficult to clarify circulating coal slurry water, and is similar to coal slurry water.
  • the reasons for difficulty in clarifying circulating coal slurry in a coal preparation plant are as follows: 1) The content of clay mineral in the circulating coal slurry water is high, and it is easy to be muddy into fine particles with negative charge, so that the circulating coal slurry water is strongly dispersed; 2) charged The particles adsorb a large amount of cations in the water, which deteriorates the water quality and aggravates the sedimentation stability of the fine particles in water. 3) The circulating coal slurry water has low hardness and high clay content, which causes the fine particles to circulate and accumulate in the water.
  • coal slurry water generally uses high-molecular flocculant to flocculate and precipitate coal slurry water. Although it can theoretically achieve the effect of sedimentation of slime water, the technology has practical applications: 1) Coal mud water is difficult to clarify. The coal slurry water contains a large amount of fine particles, and a small amount of flocculant flocculation process has a large number of trapping phenomenon. However, a large amount of flocculating agent can realize the clarification of the slime water, which is economically unfeasible, so the flocculation effect is not good; 2) Pharmacy It is used in a large amount and does not ensure stable operation of the system.
  • the coal slurry of the coal preparation plant has a large amount of water and a high circulation rate.
  • a large amount of flocculant must be added.
  • the amount of coal slurry water and solid particle concentration fluctuates greatly. This technology cannot ensure the stable concentration of circulating coal slurry water and affect the stable operation of the system.
  • the cost of slime water treatment is high. A large amount of flocculant is discharged into the water body after being polymerized with the slime, which cannot be recycled, and the cost of the treatment of the slime water is high; 4)
  • the monomer in the flocculant has certain toxicity, which may cause secondary pollution.
  • the principle of polymer flocculation technology is adsorption bridge.
  • the invention utilizes cheap raw materials, realizes clarification of coal slurry water through water quality adjustment and control, and has strong economy and applicability.
  • SUMMARY OF THE INVENTION it is an object of the present invention to provide an efficient clarification method for circulating coal slurry water which is easy to clarify, has a small amount of chemicals, has no secondary pollution, and has low cost.
  • the technical solution adopted by the present invention to solve the technical content thereof is: adding water quality in coal slurry water
  • the water quality adjusting agent may be a mineral type coagulant or a powdery industrial soluble calcium salt or a magnesium salt compound; and a high hardness and low turbidity wastewater may also be used.
  • the amount of water quality regulator added is determined by testing the hardness of the circulating coal slurry water.
  • the critical value of water hardness is the critical water hardness of the slime water settling, in the slime water system
  • a good water quality environment improves the sedimentation characteristics of the particles.
  • the water quality is adjusted to increase the hardness of the water body, and most of the fine particles are agglomerated and settled.
  • the formed agglomeration density is large, and the sedimentation speed is fast, so that the slime water is completely clarified and the system is stably operated;
  • An efficient clarification method for circulating coal slurry water according to the present invention is to add a water quality adjusting agent to the coal slurry water.
  • the amount of water quality adjusting agent is determined by testing the hardness of the coal slurry water. When the test result is lower than the critical value index, the water quality adjusting agent is added.
  • the water quality adjusting agent is a mineral type coagulant or an industrial soluble calcium salt, a magnesium salt, and a mineral type coagulant.
  • Natural raw gypsum is used; water quality regulator can also use high hardness and low turbidity wastewater.
  • the powdery drug addition point selects a place where the water flow in the slime water system is rapid and is favorable for the dissolution of the dry powder medicament, such as the overflowing liquid helium position of the concentration device.
  • the water quality regulator is selected from a mineral type coagulant or a powdery industrial soluble calcium salt or magnesium salt compound:
  • the test has a critical hardness value of 10. 0 iTimol/L. After the stable operation of the field system, the actual hardness of the circulating slime water is 2. 0 mm O l/L, below the critical value. Water quality adjuster needs to be added;
  • the clay minerals and coal are not easy to settle in the coal slurry water.
  • the two have a strong negative charge in the water, and the same sex repels each other, which increases the stability of the system.
  • the powdery water quality regulator dissolves in the slime water and releases calcium and magnesium ions.
  • the high hardness wastewater itself is dissolved in a large amount of calcium and magnesium ions.
  • the adsorption of calcium and magnesium ions on the surface of coal and clay particles compresses the double electric layer on the surface of the particles, reduces the potential of the particles, improves the collision adhesion efficiency between the particles, and forms a dense cluster.
  • the rapid agglomeration of the agglomerates achieved the purpose of clarification of the slime water.
  • the presence of these two ions is less affected by external factors and can be stably present, which acts with the water circulation. Therefore, after the water quality is stable, the amount of the water quality regulator is small.

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  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Separation Of Suspended Particles By Flocculating Agents (AREA)

Description

一种循环煤泥水的高效澄清方法
技术领域 本发明涉及一种循环煤泥水的高效澄清方法， 尤其适用于难澄清循 环煤泥水， 也适用于与煤泥水具有相似物质组成的工业废水处理。 背景技术 选煤厂循环煤泥水难澄清的原因有： 1 )循环煤泥水中粘土矿物含量 高，易泥化成带有负电荷的微细颗粒，使循环煤泥水呈很强的分散状态； 2)带电颗粒大量吸附水中的阳离子， 使水质恶化， 加剧了微细颗粒在水 中的沉降稳定性； 3)循环煤泥水水质硬度低、 粘土含量高， 导致微细 颗粒在水中循环、 集聚。
目前， 煤泥水普遍使用高分子絮凝剂来絮凝沉淀煤泥水， 虽然理论 上能够实现沉淀煤泥水的作用， 但该技术在实际应用中存在着： 1 )煤泥 水难澄清。 煤泥水中含有大量微细颗粒， 少量絮凝剂絮凝过程存在大量 漏捕现象， 而大量使用絮?疑剂可以实现煤泥水澄清， 看在经济上是不可 行的，所以絮凝效果不好； 2)药剂使用量大，且不能确保系统稳定运行。 选煤厂煤泥水水量大、 循环率高， 要实现煤泥水彻底澄清必须添加大量 絮凝剂。 煤泥水水量、 固体颗粒浓度波动都很大， 该技术不能确保循环 煤泥水浓度稳定而影响系统的稳定运行； 3)煤泥水处理成本高。大量絮 凝剂同煤泥聚合后随之排出水体， 不能循环使用， 导致煤泥水处理的药 剂成本很高； 4)絮凝剂中的单体具有一定的毒性， 会造成二次污染。
高分子絮凝技术原理为吸附架桥。 本发明利用廉价的原料， 通过水 质调整与控制实现煤泥水澄清， 具有较强的经济性和适用性。 发明内容 鉴于已有技术存在的问题， 本发明的目的是提供一种易澄清、 药剂 用量少、 无二次污染、 成本低的循环煤泥水的高效澄清方法。
本发明解决其技术内容所采用的技术方案是： 在煤泥水中添加水质 调整剂， 水质调整剂可采用矿物型凝聚剂或粉状工业可溶性钙盐、 镁盐 类化合物； 也可采用高硬度、 低浊度废水。 水质调整剂添加量通过测试 循环煤泥水水质硬度确定， 当测试水质硬度结果低于临界值时， 添加或 继续添加水质调整剂， 水质硬度临界值为煤泥水沉降的临界水质硬度， 在煤泥水系统运行中实际测定所得； 矿物型凝聚剂或粉状工业可溶性钙 盐、 镁盐类化合物选择在煤泥水系统中水流急促、 有利于粉状药剂溶解 的地点。 所述矿物型凝聚剂或粉状工业可溶性钙盐、 镁盐类化合物添加 量用公式： ffl g/L = ( Cstd - C ) 腿 ol/L ÷ P mmol/g计算确定， 其中 Cstd—临界水质硬度， C一循环煤泥水硬度， β—水质调整剂中可溶性钙 镁离子含量。所述高硬度、 低浊度废水添加量用公式： V L/L = (Cstd - C) mmol/L ÷ (C - Cstd ) mmol/L计算确定， 其中 Cstd—临界水质硬度， C 一循环煤泥水硬度， C' 一 高硬度、 低浊度废水硬度。
本发明一种循环煤泥水的高效澄清方法的有益效果：
1 ) 具有良好的水质环境改善了颗粒的沉降特性。 通过水质调整提 高水体的硬度， 大部分细颗粒凝聚、 沉降。 同高分子絮团相比， 形成的 聚团密度大， 沉降速度快， 使得煤泥水彻底澄清， 系统稳定运行；
2 )药剂消耗少， 确保系统稳定运行。 随着煤泥水循环， 水质硬度 变化幅度很小， 因此水质稳定后水质调整剂消耗很少。 稳定的水质保证 了煤泥水清水循环， 因此系统运行稳定；
3 )药剂使用量少， 成本低。 天然矿物、 可溶性盐类、 低浊度废水 成本都很低， 且系统稳定后需要添加的药剂量很少， 因此成本低。
4)无二次污染， 实现煤泥水处理过程绿色化。 水质调整剂通过钙、 镁离子来调整水体沉降环境， 不会造成二次污染。 具体实施方式 本发明一种循环煤泥水的高效澄清方法， 就是在煤泥水中添加水质 调整剂。 水质调整剂添加量通过测试煤泥水水质硬度确定， 当测试结果 低于临界值指标时， 添加水质调整剂， 水质调整剂采用矿物型凝聚剂或 工业可溶性钙盐、 镁盐， 矿物型凝聚剂可选用天然生石膏； 水质调整剂 也可以采用高硬度低浊度废水。 粉状药剂添加点选择在煤泥水系统中水 流急促、 有利于干粉药剂溶解的地点， 如浓缩设备溢流液堰位置。 具体实施例如下- 当水质调整剂选用矿物型凝聚剂或粉状工业可溶性钙盐、 镁盐类化 合物时：
1、首先确定煤泥水水质状况。测试煤泥水澄清的临界硬度值为 10. 0 iTimol/L, 在现场系统稳定运行后， 用硬度计测试循环煤泥水的实际硬度 为 2. 0 mmOl/L， 低于临界值， 此时需添加水质调整剂；
2、确定水质调整剂的添加量。用硬度计测定水质调整剂中可溶性钙、 镁离子的含量为 20. 0 mmol/g, 则水质调整剂的添加量用公式 m g/L 二 ( Cstd - C ) mmol/L ÷ β mmol/g计算确定， 其中 Cstd—临界水质硬度， C一循环煤泥水硬度， β—水质调整剂中可溶性钙镁离子含量。 具体为：
( 10. 0-2. 0) mmol/L ÷ 20. 0 mmol/g=0. 4 g/L, 根据计算结果的量添加 药剂。
当水质调整剂选用高硬度、 低浊度废水时：
1、首先确定煤泥水水质状况。测试煤泥水澄清的临界硬度值为 10. 0 mmol/L, 在现场系统稳定运行后， 用硬度计测试循环煤泥水的实际硬度 为 2. 0腿 ol/L， 低于临界值， 此时需添加水质调整剂；
2、确定水质调整剂添加量。用硬度计测定废水硬度为 20. 0 mmol/L， 则水质调整剂的添加量用公式 V L/L = (Cstd - C) mmol/L ÷ (C， - Cstd ) mmol/L计算确定， 其中 Cstd—临界水质硬度， C一循环煤泥水硬度， C7 一 高硬度、低浊度废水硬度。具体为（10. 0-2. 0) mmol/L ÷ (20. 0-10. 0) mmol/L=0. 8 L/L, 根据计算结果的量添加废水。
其工作原理： 煤泥水中不易沉降的主要是粘土矿物和煤， 二者在水 中带较强的负电荷， 同性相斥， 增加了体系的稳定性。 粉状水质调整剂 在煤泥水中溶解， 释放出钙镁离子。 高硬度废水本身溶有大量的钙镁离 子。 钙镁离子在煤和粘土颗粒表面的吸附压縮了颗粒表面双电层， 降低 了颗粒的 电位， 提高了颗粒之间的碰撞黏附效率， 形成了密度较大的 聚团。 聚团快速沉降， 实现了煤泥水澄清的目的。 这两种离子存在形式 受外在因素影响较小， 可以稳定存在， 随水体循环起作用， 因此水质稳 定后， 水质调整剂的用量很少。

Claims

1、一种循环煤泥水的高效澄清方法， 其特征在于： 在煤泥水中添加 水质调整剂。
2、根据权利 1所述的循环煤泥水澄清方法， 其特征在于： 所述水质 调整剂采用矿物型凝聚剂或粉状工业可溶性钙盐、 镁盐类化合物。
3、根据权利 1所述的权循环煤泥水澄清方法， 其特征在于： 所述水质 调整剂采用高硬度、 低浊度废水。
4、 根据权利 1、 2或 3所述的循环煤泥水的高效澄清方法， 其特征 在于： 所述水质调整剂添加量通过测试循环煤泥水水质硬度来确定， 当 测试水质硬度结果低于临界值时， 添加或继续添加水质调整剂。
5、根据权利 4所述的循环煤泥水的高效澄清方法， 其特征在于： 所 述水质硬度临界值为煤泥水沉降的临界水质硬度书， 在煤泥水系统运行中 实际测定所得。
6、根据权利 1或 2所述的循环煤泥水的高效澄清方法，其特征在于： 所述水质调整剂添加点选择在煤泥水系统中水流急促、 有利于粉状药剂 溶解的地点。
7、根据权利 1或 2所述的循环煤泥水的高效澄清方法，其特征在于- 所述矿物型凝聚剂或粉状工业可溶性钙盐、镁盐类化合物添加量用公式： m g/L = ( Cstd - C ) mmol/L ÷ β腿 ol/g计算确定， 其中 Cstd—临界 水质硬度， C一循环煤泥水硬度， β一水质调整剂中可溶性钙镁离子含量。
8、根据权利 1或 3所述的一种循环煤泥水的高效澄清方法，其特征 在于：所述高硬度、低浊度废水添加量用公式： V L/L - (Cstd- C) mmol/L ÷ (C， - Cstd ) mmol/L计算确定， 其中 Cstd—临界水质硬度， C一循环 煤泥水硬度， C' 一高硬度、 低浊度废水硬度。
PCT/CN2007/000236 2006-01-20 2007-01-22 Procédé d'épuration de haute efficacité pour le recyclage d'eau de suspension de charbon WO2007082492A1 (fr)

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Families Citing this family (3)

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CN104229963B (zh) * 2014-09-16 2016-05-18 中国矿业大学(北京) 一种煤泥水澄清的凝聚剂添加控制方法
CN104588199B (zh) * 2015-01-19 2017-05-31 中国矿业大学 一种煤炭洗选过程中泥化抑制方法
CN105903547A (zh) * 2016-05-16 2016-08-31 中国矿业大学 一种基于溶液化学特征调控的煤泥泥化抑制方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1055720A (zh) * 1990-11-10 1991-10-30 柳生 一种复合净水剂及其制法和应用
CN1180667A (zh) * 1996-10-22 1998-05-06 中国矿业大学 矿物型凝聚剂的使用方法
CN1262233A (zh) * 1999-01-25 2000-08-09 陈弓 一种废水处理混凝剂及其制备方法
US20020139754A1 (en) * 2001-02-16 2002-10-03 Miller Olen O. Method and apparatus for dewatering coal tailings and slurries and removing contaminants therefrom

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB481499A (en) * 1936-06-06 1938-03-07 Frederick George Francis Improvements in and relating to the flocculation of solid in liquid suspensions
CN1055451C (zh) * 1993-04-06 2000-08-16 中国矿业大学 一种阳离子絮凝剂
CN1346297A (zh) * 1997-11-03 2002-04-24 选择性石油凝聚过程股份有限公司 粉煤凝聚物的受控产品和回收
GB9801524D0 (en) * 1998-01-23 1998-03-25 Allied Colloids Ltd Thickening of aqueous mineral suspensions

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1055720A (zh) * 1990-11-10 1991-10-30 柳生 一种复合净水剂及其制法和应用
CN1180667A (zh) * 1996-10-22 1998-05-06 中国矿业大学 矿物型凝聚剂的使用方法
CN1262233A (zh) * 1999-01-25 2000-08-09 陈弓 一种废水处理混凝剂及其制备方法
US20020139754A1 (en) * 2001-02-16 2002-10-03 Miller Olen O. Method and apparatus for dewatering coal tailings and slurries and removing contaminants therefrom

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