CN100429156C - Highly efficient clarification method of circulating black water - Google Patents

Highly efficient clarification method of circulating black water Download PDF

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Publication number
CN100429156C
CN100429156C CNB2006100379935A CN200610037993A CN100429156C CN 100429156 C CN100429156 C CN 100429156C CN B2006100379935 A CNB2006100379935 A CN B2006100379935A CN 200610037993 A CN200610037993 A CN 200610037993A CN 100429156 C CN100429156 C CN 100429156C
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CN
China
Prior art keywords
water
water quality
agent
black
black water
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Expired - Fee Related
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CNB2006100379935A
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Chinese (zh)
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CN1803653A (en
Inventor
刘炯天
张明青
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China University of Mining and Technology CUMT
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China University of Mining and Technology CUMT
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Priority to CNB2006100379935A priority Critical patent/CN100429156C/en
Publication of CN1803653A publication Critical patent/CN1803653A/en
Priority to AU2007207277A priority patent/AU2007207277B2/en
Priority to PCT/CN2007/000236 priority patent/WO2007082492A1/en
Application granted granted Critical
Publication of CN100429156C publication Critical patent/CN100429156C/en
Expired - Fee Related legal-status Critical Current
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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

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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)

Abstract

The present invention relates to a high efficiency clarification method of circulating black water, which is suitable for circulating black water in a coal washery. The present invention realizes the clarification of black water by adding water quality modifying agent in the black water to increase the water quality hardness. The water quality hardness of the black water is detected by a sclerometer; when the detection result is below the critical value, the supplementary quantity of the water quality modifying agent is calculated and determined, and the water quality modifying agent is added. Aiming at the characteristic of black water difficult to clarify, cheap water quality modifying agent without secondary pollution can be used; the sedimentation of solid granules in the black water is accelerated through the adjustment of the water quality hardness, and the clarification and the high-efficiency circulating use of the black water are realized. The present invention solves the problems of difficult settlement of the black water, high consumption of medicament, existence of secondary pollution, incapable normal running of a system caused by secondary pollution, etc. in the coal washery, and the present invention has wide applicability.

Description

A kind of efficient defecation method of the black water that circulates
One, technical field
The present invention relates to-the efficient defecation method of kind of circulation black water, be particularly useful for difficult clarification circulation black water, also be applicable to black water to have the Industrial Wastewater Treatment that similar substance is formed.
Two, background technology
Coal separating plant's clarifying reason of circulation coal slime shipwreck has: 1) circulation black water CLAY MINERALS AND THEIR SIGNIFICANCE content height, and easily argillization becomes to have the subparticle of negative charge, makes the circulation black water be very strong dispersion state; 2) positively charged ion in a large amount of planar water of charged particle makes water quality deterioration, has aggravated the sedimentation stability of subparticle in water; 3) circulation black water water hardness is low, clay content is high, causes subparticle to circulate in water, gather.
At present, black water generally uses polymeric flocculant to come the flocculation sediment black water, though can realize precipitating the effect of black water in theory, this technology exists in actual applications: 1) coal slime shipwreck clarification.Contain a large amount of subparticles in the black water, the small amount of flocculant flocculation process exists a large amount of the leakage to catch phenomenon, and uses flocculation agent can realize the black water clarification in a large number, sees it is infeasible economically, so flocculating effect is bad; 2) the medicament usage quantity is big, and can not guarantee system stable operation.Coal separating plant's black water water yield is big, cycling rate is high, and thoroughly clarification must a large amount of flocculation agents of interpolation to realize black water.The fluctuation of the black water water yield, concentration of solid particles is all very big, and this technology can not be guaranteed to circulate the black water concentration stabilize and the steady running that influences system; 3) black water processing cost height.A large amount of flocculation agents are discharged water body after with the coal slime polymerization thereupon, can not recycle, and the reagent cost that causes black water to be handled is very high; 4) monomer in the flocculation agent has certain toxicity, can cause secondary pollution.
The flocculating polymer know-why is an adsorption bridging.The present invention utilizes cheap raw material, realizes the black water clarification by water quality adjustment and control, has stronger economy and suitability.
Three, summary of the invention
In view of the problem that prior art exists, the purpose of this invention is to provide that a kind of easy clarification, dosing are few, the efficient defecation method of non-secondary pollution, circulation black water that cost is low.
The present invention solves the technical scheme that its technology contents adopts: add water quality and adjust agent in black water, water quality is adjusted agent can adopt mineral floculating agent or powdery industry soluble calcium salt, magnesium salts compound; Also can adopt high rigidity, low turbidity water.Water quality is adjusted agent addition test loop black water water hardness and is determined, when test water quality hardness result subcritical value, add or continue to add water quality and adjust agent, the water hardness threshold value is the settled critical water hardness of black water, at slime water system practical measurement gained in service; Mineral floculating agent or powdery industry soluble calcium salt, magnesium salts compound be chosen in the slime water system current rapid, help mealy medicine dissolved place.Described mineral floculating agent or powdery industry soluble calcium salt, magnesium salts compound addition formula: mg/L=(C Std-C) mmol/L ÷ β mmol/g calculate to determine, C wherein Std-critical water hardness, C-circulation black water hardness, β-water quality is adjusted solubility calcium magnesium ion content in the agent.Described high rigidity, low turbidity water addition formula: VL/L=(C Std-C) mmol/L ÷ (C '-C Std) mmol/L calculate to determine, C wherein Std-critical water hardness, C-circulation black water hardness, C '-high rigidity, low turbidity water hardness.
The beneficial effect of the efficient defecation method of a kind of black water that circulates of the present invention:
1) has good water quality environment and improved the particulate settling character.By the hardness of water quality adjustment raising water body, most of fine particle cohesion, sedimentation.Compare with the polymer floc sedimentation, poly-density of formation is big, and settling velocity is fast, makes black water thoroughly clarify, system stable operation;
2) reagent consumption is few, guarantees system stable operation.Along with the black water circulation, the water hardness rangeability is very little, so water quality is adjusted agent consumption seldom after the water conditioning.Stable water quality has guaranteed the circulation of black water clear water, so system is stable;
3) the medicament usage quantity is few, and cost is low.Natural mineral, solubility salt, low turbidity water cost are all very low, and need the pharmaceutical quantities of adding seldom behind the system stability, so cost is low.
4) non-secondary pollution is realized the greenization of black water treating processes.Water quality is adjusted agent and is adjusted water body sedimentation environment by calcium, magnesium ion, can not cause secondary pollution.
Four, embodiment
The efficient defecation method of a kind of black water that circulates of the present invention is exactly to add water quality to adjust agent in black water.Water quality is adjusted the agent addition and is determined by test black water water hardness, when test result subcritical value index, add water quality and adjust agent, water quality adjustment agent employing mineral floculating agent or industrial soluble calcium salt, magnesium salts, mineral floculating agent can be selected natural plaster stone for use; Water quality is adjusted agent and also can be adopted high rigidity to hang down turbidity water.Mealy medicine add point selection current in slime water system rapid, help dry powder pharmaceutical dissolved place, as position, thickening equipment overflowing liquid weir.
Specific embodiment is as follows:
When water quality is adjusted agent and is selected mineral floculating agent or powdery industry soluble calcium salt, magnesium salts compound for use:
1, at first determines the black water water quality condition.Test black water clarifying critical hardness value is 10.0mmol/L, at the scene behind the system stable operation, is 2.0mmol/L with the actual hardness of sclerometer test loop black water, and the subcritical value needs to add water quality adjustment agent this moment;
2, determine the addition of water quality adjustment agent.The content of measuring solubility calcium, magnesium ion in the water quality adjustment agent with sclerometer is 20.0mmol/g, and then water quality is adjusted the addition formula mg/L=(C of agent Std-C) mmol/L ÷ β mmol/g calculate to determine, C wherein Std-critical water hardness, C-circulation black water hardness, β-water quality is adjusted solubility calcium magnesium ion content in the agent.Be specially: (10.0-2.0) mmol/L ÷ 20.0mmol/g=0.4g/L, add medicament according to the amount of calculation result.
When high rigidity, low turbidity water are selected in water quality adjustment agent for use:
1, at first determines the black water water quality condition.Test black water clarifying critical hardness value is 10.0mmol/L, at the scene behind the system stable operation, is 2.0mmol/L with the actual hardness of sclerometer test loop black water, and the subcritical value needs to add water quality adjustment agent this moment;
2, determine water quality adjustment agent addition.Measuring waste water hardness with sclerometer is 20.0mmol/L, and then water quality is adjusted the addition formula VL/L=(C of agent Std-C) mmol/L ÷ (C '-C Std) mmol/L calculate to determine, C wherein Std-critical water hardness, C-circulation black water hardness, C '-high rigidity, low turbidity water hardness.Be specially (10.0-2.0) mmol/L ÷ (20.0-10.0) mmol/L=0.8L/L, add waste water according to the amount of calculation result.
Its principle of work: being difficult for settled in the black water mainly is clay mineral and coal, and the two is with stronger negative charge in water, and the same sex is repelled each other, and has increased the stability of system.Powdery water quality is adjusted agent and is dissolved in black water, discharges calcium ions and magnesium ions.High rigidity waste water itself is dissolved with a large amount of calcium ions and magnesium ions.Calcium ions and magnesium ions has compressed the particle surface electrostatic double layer in the absorption of coal and clay particle surface, has reduced the particulate zeta-potential, and efficient is sticked in the collision that has improved between the particle, has formed the bigger poly-group of density.Poly-group rapid subsidence has realized the clarifying purpose of black water.It is less that these two kinds of ion existence forms are influenced by externalities, can stable existence, work with the water body circulation, so after the water conditioning, and the consumption that water quality is adjusted agent is seldom.

Claims (1)

1, a kind of efficient defecation method of the black water that circulates, in black water, add water quality and adjust agent, it is mineral floculating agent, powdery industry soluble calcium salt, magnesium salts compound or high rigidity, low turbidity water that described water quality is adjusted agent, it is characterized in that: water quality is adjusted agent addition test loop black water water hardness and is determined, when test water quality hardness result subcritical value, add or continue to add water quality and adjust agent, the concrete step is poly-as follows:
1) when water quality is adjusted agent and is selected mineral floculating agent or powdery industry soluble calcium salt, magnesium salts compound for use:
A. determine the black water water quality condition, the clarifying critical water hardness C of test black water Std
B. use sclerometer test loop black water hardness C, if the subcritical value needs to add water quality this moment and adjusts agent;
C. determine the addition of water quality adjustment agent, measure the content β that water quality is adjusted solubility calcium, magnesium ion in the agent with sclerometer, then the addition of water quality adjustment agent is: mg/L=(C Std-C) mmol/L ÷ β mmol/g;
2) when high rigidity, low turbidity water are selected in water quality adjustment agent for use:
A. determine the black water water quality condition, the clarifying critical water hardness C of test black water Std
B. use sclerometer test loop black water hardness C,, need to add water quality this moment and adjust agent if be lower than value;
C. determine water quality adjustment agent addition, measure high rigidity, low turbidity water hardness C ' with sclerometer, then the addition of water quality adjustment agent is: VL/L=(C Std-C) mmol/L ÷ (C '-C Std) mmol/L.
CNB2006100379935A 2006-01-20 2006-01-20 Highly efficient clarification method of circulating black water Expired - Fee Related CN100429156C (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CNB2006100379935A CN100429156C (en) 2006-01-20 2006-01-20 Highly efficient clarification method of circulating black water
AU2007207277A AU2007207277B2 (en) 2006-01-20 2007-01-22 A high efficiency purifying method for recycling coal slurry water
PCT/CN2007/000236 WO2007082492A1 (en) 2006-01-20 2007-01-22 A high efficiency purifying method for recycling coal slurry water

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNB2006100379935A CN100429156C (en) 2006-01-20 2006-01-20 Highly efficient clarification method of circulating black water

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CN100429156C true CN100429156C (en) 2008-10-29

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WO (1) WO2007082492A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104229963B (en) * 2014-09-16 2016-05-18 中国矿业大学(北京) A kind of flocculating agent of black water clarification adds control method
CN104588199B (en) * 2015-01-19 2017-05-31 中国矿业大学 Argillization suppressing method during a kind of coal washing
CN105903547A (en) * 2016-05-16 2016-08-31 中国矿业大学 Coal slime argillization inhibition method based on adjustment and control of solution chemical properties
CN112239253A (en) * 2020-06-16 2021-01-19 鄂尔多斯市中钰泰德煤炭有限公司 Efficient coal slurry pretreatment system and method for power coal preparation plant

Citations (4)

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Publication number Priority date Publication date Assignee Title
CN1055720A (en) * 1990-11-10 1991-10-30 柳生 A kind of composite water purifying agent and method for making thereof and application
CN1093342A (en) * 1993-04-06 1994-10-12 中国矿业大学 Cation coagulant
CN1180667A (en) * 1996-10-22 1998-05-06 中国矿业大学 Using method of mineral floculating agent
US6171506B1 (en) * 1998-01-23 2001-01-09 Ciba Specialty Chemicals Water Treatments Limited Thickening of aqueous mineral suspensions

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GB481499A (en) * 1936-06-06 1938-03-07 Frederick George Francis Improvements in and relating to the flocculation of solid in liquid suspensions
WO1999022871A1 (en) * 1997-11-03 1999-05-14 Selective Oil Agglomeration Process Pty. Ltd. Controlled production and recovery of fine-coal agglomerates
CN1262233A (en) * 1999-01-25 2000-08-09 陈弓 Coagulant for treating waste water and preparing process thereof
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CN1055720A (en) * 1990-11-10 1991-10-30 柳生 A kind of composite water purifying agent and method for making thereof and application
CN1093342A (en) * 1993-04-06 1994-10-12 中国矿业大学 Cation coagulant
CN1180667A (en) * 1996-10-22 1998-05-06 中国矿业大学 Using method of mineral floculating agent
US6171506B1 (en) * 1998-01-23 2001-01-09 Ciba Specialty Chemicals Water Treatments Limited Thickening of aqueous mineral suspensions

Non-Patent Citations (3)

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煤泥水中黏土颗粒对钙离子的吸附实验研究及机理探讨. 张明青，刘炯天，李小兵.中国矿业大学学报，第33卷第5期. 2004 *
石灰在煤泥水混凝中的作用机理研究. 苏永渤，李亚峰，张健.沈阳建筑工程学院学报，第12卷第4期. 1996 *

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CN1803653A (en) 2006-07-19
AU2007207277A1 (en) 2007-07-26
AU2007207277B2 (en) 2011-03-03
WO2007082492A1 (en) 2007-07-26

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