CN102951755A - Processing method and processing equipment of rear earth wastewater - Google Patents
Processing method and processing equipment of rear earth wastewater Download PDFInfo
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- CN102951755A CN102951755A CN2012104815572A CN201210481557A CN102951755A CN 102951755 A CN102951755 A CN 102951755A CN 2012104815572 A CN2012104815572 A CN 2012104815572A CN 201210481557 A CN201210481557 A CN 201210481557A CN 102951755 A CN102951755 A CN 102951755A
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Abstract
The invention discloses a processing method and processing equipment of rear earth wastewater. The processing method comprises the following step that the rear earth extraction wastewater is sequentially processed by a high-efficiency heavy metal-removing and denitrification reactor, a rear earth recovery reactor, an air floatation device, an adjustment pool, a neutralization reaction tank, a neutralization precipitation tank, an intermediate water pool, a front filter, a catalytic oxidation tower, a chemical precipitation tank and a clarification pool to reach a standard of discharge. The processing method and the processing equipment of the rear earth wastewater, disclosed by the invention, can realize that the rear earth wastewater can stably reach the standard of discharge in a long period, and simultaneously, trace rear earth and organic phase can be recovered as far as possible during the rear earth wastewater processing process.
Description
Technical field
The present invention relates to the treatment process of RE waste water, belong to technical field of waste water processing, more specifically is a kind of method and apparatus that adopts physical chemistry method to process RE waste water.
Background technology
RE waste water is the trade effluent that produces in the rare-earth smelting sepn process, production process is: content of rare earth obtains the mixed chlorinated rare earth feed liquid at 90% left and right sides rare earth ore concentrate through dissolving with hydrochloric acid, removal of impurities, then adopt P507, P204, naphthenic acid, kerosene etc. that the mixed chlorinated rare earth feed liquid is extracted grouping or separation, obtain single rare earth or compound rare-earth compound solution, solution carries out the low temperature calcination after oxalic acid precipitation, cleaning, obtain rare earth oxide.
Because the industrial production of Rare Earth Enterprises extensively adopts the organic extractant phase Technology under acidic conditions, and extraction agent mainly take phosphorus extractant as main, the extraction wastewater that produces in the production process that rare-earth smelting separates has high saliferous, oil-containing, be mainly the organic phases such as kerosene, P507, P204, the pollution factors such as strongly-acid, COD concentration height, total phosphorus and ammonia nitrogen; By contain a large amount of heavy metals and radioelement in rare earth ore concentrate, such as Cr, Cd, Pb, Zn, As, Th, U etc., this dvielement all enters in smelting process in the RE waste water simultaneously, and the heavy metal element in the waste water exceeds standard.Rare-earth smelting precipitation workshop section adopts again oxalic acid will extract the rare earth ion that workshop section's extraction obtains to precipitate, and the precipitated crystal thing cleans in the precipitation waste water of formation strongly-acid, contain the oxalic acid material, has the pollution factors such as high saliferous, high COD concentration, micro heavy.A large amount of RE waste water that contains all kinds of pollution factors is the important source that the rare-earth smelting separation industries is polluted, cause rare-earth smelting to separate the major reason of enterprise's surrounding enviroment and water pollution, also be the healthy and stable main factor for development of restriction rare-earth trade, strengthen RE waste water improvement technical research most important.
At present, the RE waste water technology of most domestic Rare Earth Production enterprise is the eighties research and development in last century, its main technique is to efflux after lime neutralization+precipitation+clarification, this technique is very simple but operating environment is poor, the pollution factors such as COD, total phosphorus, oil, heavy metal exceed standard seriously in its water outlet, the surrounding enviroment environment is caused great pollution, and the Rare Earth Enterprises environmental disruption makes the development of whole rare-earth trade be subject to serious restriction.On the other hand, waste water treatment process technology and the management of original extensive style are all run off rare earth element useful in the RE waste water, organic phase, and the rare earth yield is not high, the organic phase consumption is large, is unfavorable for the practice and extension of the clearer production technology of Rare Earth Enterprises.From 2010, after " rare-earth industry emission standard " issue, the wastewater discharge standard of Rare Earth Enterprises significantly improved, and the original waste water treatment process of Rare Earth Enterprises has lagged far behind national standard.Verify along with Chinese Ministry of Environmental Protection continues in depth to carry out the rare-earth trade environmental protection, the environmental protection pressure of Rare Earth Enterprises further strengthens, and old waste water treatment process directly affects the important factor of enterprise's final and decisive juncture.
Summary of the invention
Problem for above-mentioned prior art existence, the invention provides a kind for the treatment of process and equipment of RE waste water, the qualified discharge that the RE waste water long period is stable is guaranteed in realization, simultaneously reclaims as far as possible trace rare-earth and organic phase in the waste water in the RE waste water treating processes.
The problem that exists for solving prior art, the technical scheme that the present invention takes is: a kind for the treatment of process of RE waste water comprises the steps:
(1) rare earth extraction waste water is promoted through pump by the wastewater collection pond and enters the efficient heavy denitrification reactor that removes, and by adding except heavy medicament, coagulating agent is removed the heavy metal ion formation heavy metal slag in the waste water, and the heavy metal slag drains into except heavy slag filter; By adding the ammonia nitrogen concentration in the denitrogenation medicament reduction waste water; Described is sulfide except weighing medicament, preferred Na
2S, coagulating agent are polymerize aluminum chloride.Heavy metal in waste water and radioelement mainly are Cr, Cd, Pb, Zn, As, Th, U etc., adopt the sulfide precipitation clearance high, and applicable pH range is large; Described denitrogenation medicament is NaClO;
(2) efficient except the extraction wastewater of heavy denitrification reactor after processing with after oxalic acid precipitation waste water mixes by pipeline static mixer, gravity flow enters rare earth and reclaims reactor, reclaim residual a small amount of rare earth in extraction wastewater, the oxalic acid precipitation waste water, the rare earth of recovery enters to the rare earth slag strainer and carries out regularly collecting after pulp water separates; Describedly efficient all establish water-and-oil separator except heavy denitrification reactor, rare earth reclaim reactor, reclaim the organic phase in the waste water;
(3) rare earth reclaims the reactor water outlet and enters air-floating apparatus, and pressure air-dissolving water mixes generation air supporting effect with waste water, removes the oily substance of most suspended state oil, colloidal attitude and solubilised state in the waste water;
(4) air-floating apparatus water outlet gravity flow enters equalizing tank;
(5) the equalizing tank water outlet promotes with pump and enters the neutralization reaction tank, regulates waste water ph to pH by adding white lime〉8, behind dosing coagulant, coagulant aids, the flocculation agent, water outlet enters Neutralization settlement tank precipitation; Wherein, described coagulating agent adopts polymerize aluminum chloride, coagulant aids to adopt ferrous sulfate, and flocculation agent adopts polyacrylamide;
(6) water outlet of Neutralization settlement tank is from flowing into intermediate pool, promote through fore filter removal suspended substance with pump, water outlet enters the catalyzed oxidation tower, by adding chemical oxidizing agent waste water is carried out catalyzed oxidation, remove on the one hand the COD in the waste water, organophosphorus in the phosphorus base organic phase remaining in the waste water can be converted into phosphate radical on the other hand, used chemical oxidizing agent is ozone;
(7) water outlet of catalyzed oxidation tower enters chemical settling tank precipitation after pipeline static mixer adds chemical dephosphorization medicament, flocculation agent, after adding the chemical dephosphorization medicament precipitation of the phosphate radical in the waste water is removed, and reaches the purpose that reduces total phosphorus; Described chemical dephosphorization medicament is aluminium salt, molysite, and the flocculation agent of employing is polyacrylamide;
(8) water outlet of chemical settling tank enters settling pond, qualified discharge behind the suspended substance in the continuation clarification removal waste water.
Chemical settling tank in Neutralization settlement tank in the step (6) and the step (7) produce in and slag, chemical dephosphorization slag enter sludge thickener, sludge thickener bottom thickened sludge is promoted to the rear outward transport of dewatering of sheet frame water extracter with pump and disposes.
The described waste gas that produces in wastewater treatment process except heavy denitrification reactor, rare earth recovery reactor and air-floating apparatus is collected into emission-control equipment by the pipeline on the device top blind flange.
A kind of rare earth waste water treatment device, comprise: wastewater collection pond, pump, pipeline static mixer, efficient except heavy denitrification reactor, rare earth recovery reactor, air-floating apparatus, equalizing tank, neutralization reaction tank, Neutralization settlement tank, intermediate pool, fore filter, catalyzed oxidation tower, chemical settling tank and settling pond, described wastewater collection pond is connected except weighing the denitrification reactor water-in with efficient by pump, and described efficient tapered bucket except heavy denitrification reactor bottom is connected with and removes heavy slag filter; The described efficient weight denitrification reactor water outlet that removes links to each other with the front end of pipeline static mixer, establishes pipeline opening in the middle of the described pipeline static mixer and links to each other with the oxalic acid precipitation wastewater inlet pipe; The terminal pipeline of pipeline static mixer links to each other with the water-in that rare earth reclaims reactor, and the tapered bucket that described rare earth reclaims reactor is connected with the rare earth slag strainer by the rare earth recovery tube; The outlet conduit that described rare earth reclaims reactor links to each other with air-floating apparatus, and described air-floating apparatus conical bottom bucket is connected with sludge thickener; Described air-floating apparatus water outlet connects equalizing tank, and described equalizing tank is by pump connecting tube static mixer front end; The end of pipeline static mixer connects the neutralization reaction tank, described neutralization reaction tank water outlet connects the thrust-augmenting nozzle at Neutralization settlement tank center, the tapered bucket of described Neutralization settlement pot bottom is connected with sludge thickener, the water outlet of described Neutralization settlement tank is positioned at the tank body upper end, connect intermediate pool, the intermediate pool water outlet connects fore filter top water-in by pump, fore filter bottom water outlet connects the water-in of catalyzed oxidation tower upper end, the water outlet of catalyzed oxidation tower lower end connects chemical settling tank center thrust-augmenting nozzle, the tapered bucket of chemical settling pot bottom is connected with sludge thickener, and the water outlet of chemical settling tank upper end connects settling pond.
Described efficient comprise except heavy denitrification reactor: except heavy reactor, multi-phase separation district and denitrification reactor, described except heavy reactor by overflowing the mouth of a river and the multi-phase separation district joins, described multi-phase separation district by opposite side overflow the mouth of a river and denitrification reactor joins.
Described all be furnished with whipping appts except weighing reactor and denitrification reactor inside; Described multi-phase separation is provided with the composite inclined tube packing in the district, promotes except heavily reacting the heavy metal sediment rapid precipitation that generates.
Describedly be connected with two chemicals dosing plants except heavy reactor water-in, be respectively applied to add except heavy medicament and coagulating agent, wherein, described except heavy medicament is sulfide, preferred Na
2S, coagulating agent are polymerize aluminum chloride.Heavy metal in waste water mainly is plumbous, arsenic, and zinc etc. adopt the sulfide precipitation clearance high, and applicable pH range is large; Described denitrification reactor also is provided with chemicals dosing plant, is used for adding the denitrogenation medicament, and described denitrogenation medicament is NaClO.
It is three parts that described rare earth reclaims reactor, is followed successively by inhalant region, multi-phase separation district and exhalant region by the water inlet water (flow) direction, and described inhalant region lower end is provided with water inlet pipe, and the upper end is provided with water outlet; Described multi-phase separation is provided with the composite inclined tube packing in the district, promotes the rare earth rapid precipitation.
All add water-and-oil separator in the described efficient multi-phase separation district that reclaims reactor except multi-phase separation district and the rare earth of heavy denitrification reactor, described water-and-oil separator upper end is provided with oil discharge outlet, the lower end is provided with water port, described oil discharge outlet connects the organic phase pond for recovering, described water port connects the multi-phase separation district, described water-and-oil separator impels the organic phase in the waste water in the multi-phase separation district to separate with waste water, and the organic phase come-up can enter the organic phase pond for recovering by oil discharge outlet.
Described catalyzed oxidation tower bottom is provided with microporous aeration device, and described microporous aeration device is connected with ozonizer by inlet pipe, and waste gas is carried out catalytic oxidation treatment, and described inlet pipe is the inverted U pipe, and the pipe of inlet pipe is tall and big in the tower height of catalyzed oxidation tower; Also be provided with spray equipment in the described catalyzed oxidation tower, described spray equipment is positioned at catalyzed oxidation tower inner top, mouth spray on the spray equipment hangs on catalyzed oxidation tower top vertically downward, and described spray equipment below is provided with contact reacts packing layer and catalyzed oxidation packing layer successively; Described catalyzed oxidation tower below also is provided with water shoot, and described water shoot is the inverted U water shoot, and the top of described inverted U water shoot is provided with venting port; Described inlet pipe and water shoot are by the stable both sides of being fixed in the catalyzed oxidation tower of bracing frame; Described catalyzed oxidation tower also is provided with the tail gas outlet, and described tail gas outlet is arranged on the top of catalyzed oxidation tower; Described catalyzed oxidation tower below water shoot one side also is provided with sewage draining exit.
Describedly efficient reclaim reactor and the air-floating apparatus top is equipped with cover plate and gas sampling pipeline except heavy denitrification reactor, rare earth, seal and prevent that waste gas is excessive and produce secondary pollution that described collection and confinement of gases pipeline is connected with emission-control equipment.
Beneficial effect of the present invention is:
(1) guarantees that RE waste water after treatment can qualified discharge, reach rare-earth industry sewage discharge primary standard.
Guarantee under the prerequisite of sewage qualified discharge that (2) the residual rare earth in the waste water is reclaimed produce no small economic benefit, the waste oil that simultaneously collection obtains can be recycled and save running cost.
(3) the vertical-flow slurry tank of the many employings of this technique precipitation process, floor space is little, less investment, running cost is lower.
(4) the integrated equipment of many employings in this technique when improving treatment effect, has reduced floor space, has saved running cost and cost of investment.
Description of drawings
Fig. 1 is the schema of RE waste water treatment process of the present invention;
Fig. 2 is rare earth waste water treatment device synoptic diagram of the present invention;
Fig. 3 is of the present invention efficient except heavy denitrification reactor apparatus structure synoptic diagram;
Fig. 4 is that rare earth of the present invention reclaims the reactor assembly structural representation;
Fig. 5 is catalyzed oxidation tower structure synoptic diagram of the present invention;
Wherein: efficiently except heavy denitrification reactor, the 2-rare earth reclaims reactor, 3-air-floating apparatus to 1-, 4-neutralization reaction tank, 5-Neutralization settlement tank, 6-fore filter, 7-catalyzed oxidation tower, 8-chemical settling tank, 9-equalizing tank, the 10-settling pond, 11-intermediate pool, 12-organic phase pond for recovering, 13-rare earth slag strainer, 14-sludge thickener, 15-pipeline static coagulator, 16-is except heavy slag filter, 17-emission-control equipment, 18-wastewater collection pond, 19-is except heavy reactor, 20-multi-phase separation district, 21-denitrification reactor, the 22-static mixer, 23-composite inclined tube packing, 24-multi-phase separation district water-in, the 25-chemicals dosing plant, the 26-chemicals dosing plant, 27-chemicals dosing plant, 28-whipping appts, the 29-water-and-oil separator, the 30-oil discharge outlet, 31-water port, 32-pump, 33-denitrification reactor water-in, the 34-cover plate, 35-cover plate, 36-inhalant region, 37-multi-phase separation district, the 38-water-and-oil separator, 39-exhalant region, 40-composite inclined plate filler, the 41-oil discharge outlet, the 42-water port, 43-oil header, the tapered bucket of 44-, the 45-connected chamber, 46-inhalant region water outlet, 47-water-and-oil separator oil collect port, 48-catalyzed oxidation tower, the 49-spray equipment, the 50-microporous aeration device, 51-ozonizer, 52-catalyzed oxidation packing layer, 53-catalytic oxidation packing layer, the 54-venting port, the outlet of 55-tail gas, 56-water shoot, the 57-sewage draining exit, the 58-inlet pipe, 59-pipeline static coagulator, 60-pipeline static coagulator.
Embodiment
The present invention is described in detail below in conjunction with embodiment.
Embodiment 1
A kind for the treatment of process of RE waste water the steps include: as shown in Figure 1
(1) rare earth extraction waste water is promoted through pump by wastewater collection pond 18 and enters the efficient heavy denitrification reactor 1 that removes, by adding Na
2S, polymerize aluminum chloride is removed the heavy metal ion in the waste water; By adding the ammonia nitrogen concentration in the NaClO reduction waste water;
(2) efficiently except the extraction wastewater of heavy denitrification reactor 1 after processing with after oxalic acid precipitation waste water mixes by pipeline static mixer 15, gravity flow enters rare earth and reclaims reactor 2, reclaim residual a small amount of rare earth in extraction wastewater, the oxalic acid precipitation waste water, rare earth reclaims rare earth that reactor 2 reclaims and enters to rare earth slag strainer 13 and carry out regularly collecting after pulp water separates, and efficiently drains into except heavy slag strainer 16 except the bottom of heavy denitrification reactor 1 connects the heavy metal slag; Efficiently all establish water-and-oil separator except heavy denitrification reactor 1, rare earth reclaim reactor 2, reclaim the organic phase in the waste water, organic phase enters 12 recovery of organic phase pond for recovering after built-in water-and-oil separator separates, and isolated aqueous-phase reflux is to wastewater collection pond 18;
(3) rare earth reclaims reactor 2 water outlets and enters air-floating apparatus 3, and pressure air-dissolving water mixes generation air supporting effect with waste water, removes the oily substance of most suspended state oil, colloidal attitude and solubilised state in the waste water;
(4) air-floating apparatus 3 water outlets gravity flow enters equalizing tank 9;
(5) equalizing tank 9 water outlets promote by entering neutralization reaction tank 4 after the pipeline static mixer 15 dosings mixing with pump, regulate waste water ph by adding white lime, transfer to pH〉8, add polymerize aluminum chloride, ferrous sulfate, polyacrylamide after, water outlet enters Neutralization settlement tank 5 precipitation;
(6) 5 water outlets of Neutralization settlement tank are from flowing into intermediate pool 11, promote through fore filter 6 removal suspended substances with pump, water outlet enters catalyzed oxidation tower 7, by adding chemical oxidizing agent waste water is carried out catalyzed oxidation, remove on the one hand the COD in the waste water, organophosphorus in the phosphorus base organic phase remaining in the waste water can be converted into phosphate radical on the other hand, used chemical oxidizing agent is the ozone of in situ preparation;
(7) 7 water outlets of catalyzed oxidation tower enter chemical settling tank precipitation 8 after pipeline static mixer 15 adds aluminium salt, polyacrylamide, after adding the chemical dephosphorization medicament precipitation of the phosphate radical in the waste water are removed, and reach the purpose that reduces total phosphorus;
(8) 8 water outlets of chemical settling tank enter settling pond 10, qualified discharge behind the suspended substance in the continuation clarification removal waste water.
In the above-mentioned steps: Neutralization settlement tank 5 and chemical settling tank 8 produce in and slag, chemical dephosphorization slag enter sludge thickener 14, sludge thickener 4 bottom thickened sludges are promoted to the rear outward transport of dewatering of sheet frame water extracter with pump and dispose; The waste gas that produces in wastewater treatment process except heavy denitrification reactor, rare earth recovery reactor 2 and air-floating apparatus 3 is collected into emission-control equipment 17 by the pipeline on the device top blind flange.
Embodiment 2
Rare earth waste water treatment device shown in Fig. 2-3, comprise: wastewater collection pond 18, pump, pipeline static mixer, efficient except heavy denitrification reactor 1, rare earth reclaims reactor 2, air-floating apparatus 3, equalizing tank 9, neutralization reaction tank 4, Neutralization settlement tank 5, intermediate pool 11, fore filter 6, catalyzed oxidation tower 7, chemical settling tank 8 and settling pond 10, wastewater collection pond 18 is connected except heavy denitrification reactor 1 water-in with efficient by pump, described efficient heavy denitrification reactor 1 inside of removing comprises: except heavy reactor 19, multi-phase separation district 20 and denitrification reactor 21, describedly join with multi-phase separation district 20 by overflowing the mouth of a river 24 except heavy reactor 19, described multi-phase separation district 20 joins with denitrification reactor 21 by the mouth of a river 33 that overflows of opposite side, described except heavy reactor 19, multi-phase separation district 20 and denitrification reactor 21 bottoms are tapered bucket, described tapered bucket all connects except heavy slag strainer 16, described except heavy reactor 19 and denitrification reactor 21 inside all being furnished with whipping appts 28, be provided with composite inclined tube packing 23 in the described multi-phase separation district 20, promote the sediment rapid precipitation except heavy 19 reaction generations, also add water-and-oil separator 29 in the described multi-phase separation district 20, described water-and-oil separator 29 upper ends are provided with oil discharge outlet 30, the lower end is provided with water port 31, described oil discharge outlet 30 connects organic phase pond for recovering 12, and described water port 31 connects wastewater collection 18 ponds; Described efficient heavy reactor 19 ingress of removing except heavy denitrification reactor 1 are connected with static mixer 22, and described static mixer 22 is connected with two chemicals dosing plants 25,26, are respectively applied to add except heavy medicament and coagulating agent, and wherein, described is Na except weighing medicament
2S, coagulating agent are polymerize aluminum chloride, and heavy metal in waste water mainly is plumbous, arsenic, and zinc etc. adopt the sulfide precipitation clearance high, and applicable pH range is large; Described denitrification reactor 21 also is provided with chemicals dosing plant 27, is used for adding the denitrogenation medicament, and described denitrogenation medicament is NaClO; Described efficient link to each other with the front end of pipeline static mixer 15 except heavy denitrification reactor 1 water outlet, described pipeline static mixer 15 centres are established pipeline opening and are linked to each other with the oxalic acid precipitation wastewater inlet pipe; The terminal pipeline of pipeline static mixer 15 links to each other with the water-in that rare earth reclaims reactor 2, and the tapered bucket that described rare earth reclaims reactor 2 is connected with rare earth slag strainer 13 by the rare earth recovery tube; The outlet conduit that described rare earth reclaims reactor 2 links to each other with air-floating apparatus 3, and described air-floating apparatus 3 conical bottom buckets are connected with sludge thickener 14; Described air-floating apparatus 3 water outlets connect equalizing tank 9, and described equalizing tank 9 is by pump connecting tube static mixer 59 front ends; The end of pipeline static mixer 59 connects neutralization reaction tank 4, described neutralization reaction tank 4 water outlets connect the thrust-augmenting nozzle at Neutralization settlement tank 5 centers, the tapered bucket of described Neutralization settlement tank 5 bottoms is connected with sludge thickener 14, the water outlet of described Neutralization settlement tank 5 is positioned at the tank body upper end, connect intermediate pool 11, intermediate pool 11 water outlets connect fore filter 6 top water-ins by pump, fore filter 6 bottom water outlets connect the water-in of catalyzed oxidation tower 7 upper ends, the water outlet of catalyzed oxidation tower 7 lower ends connects chemical settling tank 8 center thrust-augmenting nozzles by pipeline static coagulator 60, the tapered bucket of chemical settling tank 8 bottoms is connected with sludge thickener 14, and the water outlet of chemical settling tank 14 upper ends connects settling pond 10.In addition: efficiently the top except heavy denitrification reactor 1 is sealed by cover plate 34, and the waste gas that produces in wastewater treatment process is collected by the pipeline at cover plate 34 tops and entered emission-control equipment 17.
Its working process is: extraction wastewater promotes through pump 32, by chemicals dosing plant 25,26 add respectively except heavy medicament and coagulating agent, enter except heavy reactor 19 through static mixer 22, under the stirring of agitator 28, fully reaction, the sediment that produces enters except heavy slag strainer 16 through the tapered bucket except heavy reactor 19, except heavy reactor 19 overflow water outlets enter multi-phase separation district 20 by multi-phase separation district water-in 24, be provided with composite inclined tube packing 23 in the multi-phase separation district 20, promote to remove the heavily sediment rapid precipitation of reaction, be provided with water-and-oil separator 29 in the multi-phase separation district 20, multi-phase separation district 20 interior upper strata oil slick flow into water-and-oil separator 29, lower floor's sediment is entered except heavy slag strainer 16 by tapered bucket, water-and-oil separator 29 upper ends are provided with oil discharge outlet 30 and connect organic phase pond for recovering 12, the lower end is provided with water port 31 and connects wastewater collection pond 18, multi-phase separation district 20 enters denitrification reactor 21 by 33 overflows of denitrification reactor water-in, denitrification reactor 21 is furnished with chemicals dosing plant 27, add the denitrogenation medicament, under the stirring of agitator 28, fully reaction, the overflow water outlet enters subsequent technique, and namely rare earth reclaims reactor, air-floating apparatus, equalizing tank, the neutralization reaction tank, the Neutralization settlement tank, fore filter, the catalyzed oxidation tower, chemical settling tank and settling pond continue to process.
Embodiment 3
Shown in Fig. 2-4, the described rare earth waste water treatment device of present embodiment is from the different of embodiment 2: it is three parts that described rare earth reclaims reactor 2, be followed successively by inhalant region 36, multi-phase separation district 37 and exhalant region 39 by the water inlet water (flow) direction, described inhalant region 36 lower ends are provided with water inlet pipe, and the upper end is provided with water outlet; Be provided with composite inclined tube packing 40 in the described multi-phase separation district 37, promote the rare earth rapid precipitation; Described rare earth reclaims the multi-phase separation district 37 interior water-and-oil separators 38 that all add of reactor 2, and settling region 37 bottom design are tapered bucket 44, are connected with rare earth slag strainer 13; Described water-and-oil separator 38 oil-ins 47 places are provided with oil header 43, the upper strata oil slick of RE waste water is collected through oil header 43 and is entered water-and-oil separator 38 from oil-in 47, water-and-oil separator 38 upper ends are provided with oil discharge outlet 41, the lower end is provided with water port 42, described oil discharge outlet 41 connects organic phase pond for recovering 12, described water port 42 connects multi-phase separation district 37, described water-and-oil separator 38 impels in the multi-phase separation district organic phase in 37 the waste water to separate with waste water, and the organic phase come-up can enter organic phase pond for recovering 12 by oil discharge outlet 41; Be connected chamber 45 below the water-and-oil separator 38, connect multi-phase separation district 37 and exhalant region 39, rising pipe is positioned at the upper end of exhalant region 39.In addition: rare earth reclaims the top of reactor 2 and air-floating apparatus 3 by cover plate 35 sealings, and the waste gas that produces in wastewater treatment process is collected by the pipeline at cover plate 35 tops and entered emission-control equipment 17.
The improved working process in this part is: RE waste water enters the inhalant region 36 that rare earth reclaims reactor 2 after pump promotes, enter multi-phase separation district 37 by 46 overflows of inhalant region water outlet, be provided with the composite inclined tube packing 40 of glass steel material in the multi-phase separation district 37, a small amount of rare earth in the RE waste water is through composite inclined tube packing 40 postprecipitations at the most in the tapered bucket 44 of phase separation region 37 bottoms.The upper strata oil slick of RE waste water is collected through oil header 43 and is entered water-and-oil separator 38, enters exhalant region 39 through the RE waste water after the precipitation oil removal by connected chamber 45.Water-and-oil separator 38 interior oil phases enter organic phase pond for recovering 12 by oil discharge outlet 41, and water-and-oil separator 38 interior waste water enter wastewater collection pond 18 by water port 42.Regularly open tapered bucket 44, rare earth is entered rare earth slag strainer 13.
In addition, catalyzed oxidation tower 48 bottoms of stating in the present embodiment are provided with microporous aeration device 50 as shown in Figure 5, described microporous aeration device 50 is connected with ozonizer 51 by inlet pipe 58, waste gas is carried out catalytic oxidation treatment, described inlet pipe 58 is the inverted U pipe, the pipe of inlet pipe 58 is tall and big in the tower height of catalyzed oxidation tower 48, when catalyzed oxidation tower 48 interior water levels are too high, backflow effect because of liquid, the RE waste water that catalyzed oxidation tower 48 inner bottom parts compile refluxes by inlet pipe 58 easily and enters in the ozonizer 51, and in order to guarantee that the independent of ozonizer 51 uses and interference-free property, the pipe of inlet pipe 58 is tall and big in catalyzed oxidation tower 48 tower heights, avoid the generation of backflow thing, also prolonged the work-ing life of equipment; Also be provided with spray equipment 49 in the described catalyzed oxidation tower 48, described spray equipment 49 is positioned at catalyzed oxidation tower inner top, mouth spray on the spray equipment 49 hangs on catalyzed oxidation tower 48 tops vertically downward, when RE waste water is sprayed to catalyzed oxidation tower 48 when interior through spray equipment 49, RE waste water is done the movement of falling object downwards because of gravity; Open ozonizer 51, the ozone that produces in the ozonizer 51 can enter into by inlet pipe 58 microporous aeration device 50 of catalyzed oxidation tower 48 bottoms, and ozone can be in catalyzed oxidation tower 48 moved upward inside because of the gaseous volatilization character of self; At this moment, RE waste water and ozone meet in catalyzed oxidation tower 48, fully mix rapid reaction, and organophosphorus is changed into phosphate radical, effectively remove simultaneously COD, and RE waste water is filtered, and have reduced pollution; Described spray equipment 49 belows are provided with contact reacts packing layer 53 and catalyzed oxidation packing layer 52 successively, ozone passes through catalyzed oxidation packing layer 52 and contact reacts packing layer 53 successively in moving process from bottom to top, increase RE waste water and ozone contact area, accelerated the carrying out of oxidizing reaction, shortened the time of oxidizing reaction, greatly increased working efficiency, further ensured the catalyzed oxidation ability, so that the effect that technical process reaches is got twice the result with half the effort; Described catalyzed oxidation tower below also is provided with water shoot 56, reacted waste water comes together in catalyzed oxidation tower 48 inner bottom parts, water shoot 56 by catalyzed oxidation tower 48 belows is discharged, described water shoot 56 is the inverted U pipe, and the U-shaped top of water shoot 56 is provided with venting port 55, reacted waste water comes together in catalyzed oxidation tower 48 inner bottom parts, when liquid level is higher than the top of inverted U water shoot 50 in the catalyzed oxidation tower, catalyzed oxidation tower 48 is from water shoot 56 water outlets, special cast because of long-term draining and inverted U, inverted U water shoot 56 interior bubble and the steam of gathering easily, it is even to affect stable water outlet, opens the venting port 55 at water shoot 56 inverted U tops this moment, remove bubble and steam, guarantee the normal use of water shoot 56; Described catalyzed oxidation tower 48 also is provided with tail gas outlet 54, described tail gas outlet 54 is arranged on the top of catalyzed oxidation tower 48, tail gas in the reaction process is then discharged by the tail gas outlet 54 at catalyzed oxidation tower 48 tops, tail gas outlet 54 is positioned at catalyzed oxidation tower 48 tops, prolonged the reaction times of gas in catalyzed oxidation tower 48, waste gas can through discharging through top tail gas outlet 54 behind the long catalyzed oxidation, be increased work efficiency again; Described catalyzed oxidation tower below water shoot 56 1 sides also are provided with sewage draining exit 57, and catalyzed oxidation tower 48 can be removed the residual dirt of catalyzed oxidation tower 48 inner bottom parts after work after a while from sewage draining exit 57, guarantee clean and tidy in the catalyzed oxidation tower 48.In addition: described inlet pipe 58 and water shoot 56 are by the stable both sides of being fixed in catalyzed oxidation tower 48 of bracing frame.
More than the present invention has been done detailed description, but the invention is not restricted to the embodiments described.The equivalence that all spirit according to the present invention are done changes or modifies, and all should be encompassed in protection scope of the present invention.
Claims (10)
1. the treatment process of a RE waste water comprises the steps:
(1) rare earth extraction waste water is promoted through pump by the wastewater collection pond and enters the efficient heavy denitrification reactor that removes, and by adding except heavy medicament, coagulating agent is removed the heavy metal ion formation heavy metal slag in the waste water, and the heavy metal slag drains into except heavy slag filter; By adding the ammonia nitrogen concentration in the denitrogenation medicament reduction waste water;
(2) efficient except the extraction wastewater of heavy denitrification reactor after processing with after oxalic acid precipitation waste water mixes by pipeline static mixer, gravity flow enters rare earth and reclaims reactor, reclaim residual a small amount of rare earth in extraction wastewater, the oxalic acid precipitation waste water, the rare earth of recovery enters to the rare earth slag strainer and carries out regularly collecting after pulp water separates; Describedly efficient all establish water-and-oil separator except heavy denitrification reactor, rare earth reclaim reactor, reclaim the organic phase in the waste water;
(3) rare earth reclaims the reactor water outlet and enters air-floating apparatus, and pressure air-dissolving water mixes generation air supporting effect with waste water, removes the oily substance of most suspended state oil, colloidal attitude and solubilised state in the waste water;
(4) air-floating apparatus water outlet gravity flow enters equalizing tank;
(5) the equalizing tank water outlet promotes with pump and enters the neutralization reaction tank, regulates waste water ph to pH by adding white lime〉8, behind dosing coagulant, coagulant aids, the flocculation agent, water outlet enters Neutralization settlement tank precipitation;
(6) water outlet of Neutralization settlement tank is from flowing into intermediate pool, promote through fore filter removal suspended substance with pump, water outlet enters the catalyzed oxidation tower, by adding chemical oxidizing agent waste water is carried out catalyzed oxidation, remove on the one hand the COD in the waste water, organophosphorus in the phosphorus base organic phase remaining in the waste water can be converted into phosphate radical on the other hand, used chemical oxidizing agent is ozone;
(7) water outlet of catalyzed oxidation tower enters chemical settling tank precipitation after pipeline static mixer adds chemical dephosphorization medicament, flocculation agent, after adding the chemical dephosphorization medicament precipitation of the phosphate radical in the waste water is removed, and reaches the purpose that reduces total phosphorus;
(8) water outlet of chemical settling tank enters settling pond, qualified discharge behind the suspended substance in the continuation clarification removal waste water.
2. the treatment process of RE waste water according to claim 1, it is characterized in that: chemical settling tank in the Neutralization settlement tank in the step (6) and the step (7) produce in and slag, chemical dephosphorization slag enter sludge thickener, sludge thickener bottom thickened sludge is promoted to the rear outward transport of dewatering of sheet frame water extracter with pump and disposes; The described waste gas that produces in wastewater treatment process except heavy denitrification reactor, rare earth recovery reactor and air-floating apparatus is collected into emission-control equipment by the pipeline on the device top blind flange.
3. one kind is used for the as claimed in claim 1 rare earth waste water treatment device of method, comprise: wastewater collection pond, pump, pipeline static mixer, efficient except heavy denitrification reactor, rare earth recovery reactor, air-floating apparatus, equalizing tank, neutralization reaction tank, Neutralization settlement tank, intermediate pool, fore filter, catalyzed oxidation tower, chemical settling tank and settling pond, described wastewater collection pond is connected except weighing the denitrification reactor water-in with efficient by pump, and described efficient tapered bucket except heavy denitrification reactor bottom is connected with and removes heavy slag filter; The described efficient weight denitrification reactor water outlet that removes links to each other with the front end of pipeline static mixer, establishes pipeline opening in the middle of the described pipeline static mixer and links to each other with the oxalic acid precipitation wastewater inlet pipe; The terminal pipeline of pipeline static mixer links to each other with the water-in that rare earth reclaims reactor, and the tapered bucket that described rare earth reclaims reactor is connected with the rare earth slag strainer by the rare earth recovery tube; The outlet conduit that described rare earth reclaims reactor links to each other with air-floating apparatus, and described air-floating apparatus conical bottom bucket is connected with sludge thickener; Described air-floating apparatus water outlet connects equalizing tank, and described equalizing tank is by pump connecting tube static mixer front end; The end of pipeline static mixer connects the neutralization reaction tank, described neutralization reaction tank water outlet connects the thrust-augmenting nozzle at Neutralization settlement tank center, the tapered bucket of described Neutralization settlement pot bottom is connected with sludge thickener, the water outlet of described Neutralization settlement tank is positioned at the tank body upper end, connect intermediate pool, the intermediate pool water outlet connects fore filter top water-in by pump, fore filter bottom water outlet connects the water-in of catalyzed oxidation tower upper end, the water outlet of catalyzed oxidation tower lower end connects chemical settling tank center thrust-augmenting nozzle, the tapered bucket of chemical settling pot bottom is connected with sludge thickener, and the water outlet of chemical settling tank upper end connects settling pond.
4. rare earth waste water treatment device according to claim 3, it is characterized in that: described efficient comprise except heavy denitrification reactor: except heavy reactor, multi-phase separation district and denitrification reactor, described except heavy reactor by overflowing the mouth of a river and the multi-phase separation district joins, described multi-phase separation district by opposite side overflow the mouth of a river and denitrification reactor joins.
5. rare earth waste water treatment device according to claim 4 is characterized in that: described except heavily reactor and denitrification reactor inside all are furnished with whipping appts; Described multi-phase separation is provided with the composite inclined tube packing in the district.
6. rare earth waste water treatment device according to claim 5 is characterized in that: describedly be connected with two chemicals dosing plants except heavy reactor water-in, be respectively applied to add except heavy medicament and coagulating agent; Described denitrification reactor also is provided with chemicals dosing plant, is used for adding the denitrogenation medicament.
7. rare earth waste water treatment device according to claim 3, it is characterized in that: it is three parts that described rare earth reclaims reactor, be followed successively by inhalant region, multi-phase separation district and exhalant region by the water inlet water (flow) direction, described inhalant region lower end is provided with water inlet pipe, and the upper end is provided with water outlet; Described multi-phase separation is provided with the composite inclined tube packing in the district.
8. according to claim 4 or 7 each described rare earth waste water treatment devices, it is characterized in that: all add water-and-oil separator in the described efficient multi-phase separation district that reclaims reactor except multi-phase separation district and the rare earth of heavy denitrification reactor, described water-and-oil separator upper end is provided with oil discharge outlet, the lower end is provided with water port, described oil discharge outlet connects the organic phase pond for recovering, and described water port connects the multi-phase separation district.
9. rare earth waste water treatment device according to claim 3, it is characterized in that: described catalyzed oxidation tower bottom is provided with microporous aeration device, described microporous aeration device is connected with ozonizer by inlet pipe, described inlet pipe is the inverted U pipe, and the pipe of inlet pipe is tall and big in the tower height of catalyzed oxidation tower; Also be provided with spray equipment in the described catalyzed oxidation tower, described spray equipment is positioned at catalyzed oxidation tower inner top, mouth spray on the spray equipment hangs on catalyzed oxidation tower top vertically downward, and described spray equipment below is provided with contact reacts packing layer and catalyzed oxidation packing layer successively; Described catalyzed oxidation tower below also is provided with water shoot, and described water shoot is the inverted U water shoot, and the top of described inverted U water shoot is provided with venting port; Described inlet pipe and water shoot are by the stable both sides of being fixed in the catalyzed oxidation tower of bracing frame; Described catalyzed oxidation tower also is provided with the tail gas outlet, and described tail gas outlet is arranged on the top of catalyzed oxidation tower; Described catalyzed oxidation tower below water shoot one side also is provided with sewage draining exit.
10. rare earth waste water treatment device according to claim 3, it is characterized in that: described efficient heavy denitrification reactor, rare earth recovery reactor and the air-floating apparatus top of removing is equipped with cover plate and gas sampling pipeline, and described collection and confinement of gases pipeline is connected with emission-control equipment.
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| CN110668619A (en) * | 2019-11-01 | 2020-01-10 | 桂润环境科技股份有限公司 | Lead-zinc industrial mineral processing wastewater treatment device and treatment method |
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| CN111228841A (en) * | 2020-03-12 | 2020-06-05 | 金昌隆博气体有限责任公司 | Device and method for preventing system freezing and blocking in carbon dioxide double-tower rectification separation system |
| CN113045064A (en) * | 2021-03-17 | 2021-06-29 | 赣州齐畅新材料有限公司 | Method for treating rare earth processing wastewater |
| CN113248060A (en) * | 2021-06-04 | 2021-08-13 | 皓禹(厦门)环保有限公司 | Rare earth high-ammonium wastewater treatment system and method |
| CN117185444A (en) * | 2023-09-19 | 2023-12-08 | 吉水金诚新材料加工有限公司 | Method for treating oxalic acid precipitation wastewater and ammonia nitrogen wastewater of rare earth separation plant and simultaneously recycling rare earth |
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Inventor after: Han Zhengchang Inventor after: Wang Zhilei Inventor after: Ma Junjun Inventor after: Gao Yajuan Inventor after: Zhu Jiaming Inventor after: Han Feng Inventor after: Ji Jun Inventor after: Chai Huili Inventor before: Han Zhengchang Inventor before: Wang Zhilei Inventor before: Zhu Jiaming Inventor before: Han Feng Inventor before: Ji Jun Inventor before: Chai Huili |
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Address after: 210048 C building, No. 606, Ning six road, Nanjing chemical industry park, Jiangsu, China Patentee after: Nanjing Ge Luote environmental engineering limited-liability company Address before: 210048 C building, No. 606, Ning six road, Nanjing chemical industry park, Jiangsu, China Patentee before: Nanjing Green-Water Environment Engineering Co., Ltd. |