CN105080936A - Rubbish-fly-ash and cement-kiln cooperation treatment method - Google Patents
Rubbish-fly-ash and cement-kiln cooperation treatment method Download PDFInfo
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Abstract
The invention relates to a rubbish-fly-ash and cement-kiln cooperation treatment method. The treatment method sequentially includes the technological steps of three-level washing desalting, and dioxin microorganism removing; heavy metal micellar-enhanced removing; nanofiltration; reverse osmosis pre-concentrating; slight-trace-carnallite removing; and MVR evaporative crystallization. Heavy metal and chloride ions in fly ash can be removed through the three-level washing desalting and dioxin microorganism removing technological step, and fly ash produced during dioxin microorganism erosion can be used as building materials. Heavy metal, most calcium and most magnesium in the fly ash can be removed through the heavy metal micellar-enhanced removing technological step, and precipitate is pre-dried to enter a cement kiln to be incinerated. The calcium and the magnesium left in washing water are removed through the nanofiltration technological step. The washing water can be concentrated to 6% to 8% through the reverse osmosis pre-concentrating technological step, and produced water can be used for washing. A slight trace of carnallite is removed through the slight-trace-carnallite removing technological step. Concentrated liquor is evaporated and separated to obtain industrial salt through the MVR evaporative crystallization technological step.
Description
Technical field:
The present invention relates to the treatment process field of flying ash, relate to a kind of garbage flying ash cement kiln synergic processing method in particular.
Background technology:
Along with socioeconomic development, Process of Urbanization is aggravated, and a lot of big and medium-sized cities of China meet with the puzzlement of " garbage-surrounded city ".Garbage disposal has 3 kinds of modes: landfill, burning and compost, and the garbage disposal of current China adopts based on landfill, and compost and burning are auxiliary measure, and this will take a large amount of land resource.Along with the rising of land price, what urban environment required improves constantly, and garbage loading embeading becomes no longer economy and safety, and increasing city starts to consider incineration treatment of garbage.Burning disposal can make the volume of municipal refuse reduce 80-90%, and its waste residue produced can make recycling.
Flying dust is the residue of waste incineration, the carcinogenic substance “ bioxin that waste incineration produces " 90% all in flying dust.The flying dust of uncured process is dealt with improperly, and wherein a large amount of heavy metals, Ji bioxin can cause serious contamination accident, endangers residents ' health.Before, the whole nation only has several cities carrying out incineration of refuse flyash process.Flying dust processing cost is very high on the one hand.On the other hand due to irregular marketing, supervise not in place, there is the problem of harmful competition, make " flying dust " be in " disorderly flying " state.Flying dust can not obtain safe disposal, will be environmentally hazardous very big hidden danger.
Because flying dust contains a large amount of chlorions, chlorion is normally produced cement kiln and is produced very large impact, be mainly manifested in cement kiln skinning, serious meeting produces quality accident, so, the key that flying dust disposed by cement kiln removes a large amount of chlorions in flying dust, and washing process is the main method removing chlorion in flying dust.
Summary of the invention:
The object of the invention is for the deficiencies in the prior art part, a kind of garbage flying ash cement kiln synergic processing method is provided, this method achieves the innoxious of flying dust and recycling treatment, flying ash can meet the raw materials used standard of manufacture of cement, calcium magnesium in washing water is removed by nanofiltration technique, and washing water can be concentrated into 6 ~ 8% by counter-infiltration pre-concentration technique; Go denier carnallite technique to remove denier carnallite and carried out the recycling of the energy; MVR evaporative crystallization technique selects forced-circulation evaporation crystallizer high saliferous dope evaporation to be separated, and obtains Nacl for paper technology, Snow Agent and chlor-alkali industry.
Technology solution of the present invention is as follows:
A kind of garbage flying ash cement kiln synergic processing method, it comprises following technical process:
(1) incineration of refuse flyash tertiary effluent salt elution and microorganism remove bioxin technique;
(2) glue strengthening removal heavy metal technique is restrainted;
(3) nanofiltration technique;
(4) counter-infiltration pre-concentration technique;
(5) denier carnallite technique is gone;
(6) MVR evaporative crystallization technique.
As preferably, described incineration of refuse flyash tertiary effluent salt elution and microorganism are removed bioxin technique and comprise the steps:
A, washing: incineration of refuse flyash is blown into conveying worm a from flying dust storage, agitator tank a is entered through conveying worm a, add certain water gaging, and the weight ratio of flying dust and water is 1:3, adding quality in whipping process is that the chaotropic agent of 1% of flying dust carries out stirring 20 minutes, stirs fully and obtains mud;
B, dehydration: mud is transported to horizontal centrifuge a through buffer tank a and dewaters, mud is isolated the flying dust of chloro ion-containing solution and moisture Ji bioxin, the moisture content of the flying dust of moisture Ji bioxin is 40%-50%, chloro ion-containing solution enters coagulative precipitation tank, and the flying dust of moisture Ji bioxin enters agitator tank b;
C, secondary are washed: flying dust that is moisture and bioxin is conveyed into agitator tank b through conveying worm b, and carrying out stirring washing with the weight ratio of initial flying dust and water for 1:3 adds water, adding quality in whipping process is that the chaotropic agent of 1% of initial flying dust carries out stirring 20 minutes; Stir fully and obtain secondary mud;
D, second dehydration: secondary mud is transported to horizontal centrifuge b through buffer tank b and dewaters, mud is isolated the flying dust of chloro ion-containing solution and the moisture Ji bioxin of secondary, the moisture content of the flying dust of the moisture Ji bioxin of secondary is 40%-50%, chloro ion-containing solution enters coagulative precipitation tank, and the flying dust of the moisture Ji bioxin of secondary enters agitator tank c;
The fly ash carry of the moisture Ji bioxin of e, secondary to agitator tank c, and carries out stirring washing with the weight ratio of initial flying dust and water for 1:2 adds water, and adding quality in whipping process is that the chaotropic agent of 1% of initial flying dust carries out stirring 20 minutes; Stir fully and obtain three mud;
F, three mud enter horizontal centrifuge c and dewater, mud is isolated the flying dust of chloro ion-containing solution and three moisture Ji bioxin, the moisture content of the flying dust of three moisture Ji bioxin is 40%-50%, chloro ion-containing solution enters coagulative precipitation tank, the flying dust of three moisture Ji bioxin and chloride ion-containing enter lower than the flying dust of 1% heavy metal that mud collecting pit carries out in microbial attack bioxin and ash, flying dust through microbial attack bioxin can directly as the raw material of construction material, this microorganism is reusable, namely the tertiary effluent completing flying dust and water yield 1:8 washes system.
As preferably, the chaotropic agent that adds for three times that described incineration of refuse flyash tertiary effluent salt elution and microorganism are removed in bioxin technique is all adopt same set of chemicals dosing plant a, and adopts automatic control flow to throw in respectively, can send alarm when dose is not enough.
As preferably, described bundle glue strengthening removal heavy metal technique comprises the steps:
The chloro ion-containing solution obtained in a, technical process 1 enters coagulative precipitation tank, in coagulative precipitation tank, add anion active agent stir, and the quality of anion active agent accounts for 1 ‰ ~ 5 ‰ of chloro ion-containing solution quality, large molecule is formed thus precipitation after making multiple dispersed metal ionic polymerization, after static 0.5 ~ 1 hour, the heavy metal ion of 85 ~ 95% is precipitated;
B, the then clear liquid taken out on coagulative precipitation tank enter composite bag type filter and the heavy metal do not precipitated completely, contaminant filter are fallen, and obtain the solution that saliferous rate is 1-2%;
C, 85 ~ 95% heavy metal ion of precipitation are transported enter mud collecting pit and carry out pre-mummification, pre-mummification laggard enter cement kiln burn, thus solve the pollution of incineration of refuse flyash heavy metal.
As preferably, described nanofiltration technique comprises the steps: that saliferous rate is that the solution of 1-2% enters nanofiltration membrane component by feeding engine a, enter antisludging agent by chemicals dosing plant b in nanofiltration membrane component simultaneously, saliferous rate is that the calcium magnesium in the solution of 1-2% is removed by nanofiltration membrane component, and the water of output enters intermediate water tank.
As preferably, described counter-infiltration pre-concentration technique comprises the steps: that the water of intermediate water tank is sent into reverse osmosis membrane assembly with feeding engine b again and carried out counter-infiltration pre-concentration, enter antisludging agent by chemicals dosing plant c in reverse osmosis membrane assembly simultaneously, water can be concentrated into 6% ~ 8% by reverse osmosis membrane assembly, reverse osmosis membrane assembly output fresh water enters reverse osmosis produced water tank, and the water in reverse osmosis produced water tank can enter incineration of refuse flyash washing moisturizing and use.
As preferably, described in go denier carnallite technique to comprise the steps:
A, 6% ~ 8% dope enter concentrated water tank, heat up after the dope of concentrated water tank enters flat ultra micro water filtration film one-level carnallite release unit by separation feeding engine c, temperature is upgraded to 80-110 DEG C and carries out high temperature circulation process 5 ~ 10 minutes, the carnallite of high temperature section is removed, carnallite precipitation enters carnallite collecting pit, and the dope obtained turns back to concentrated water tank by dope material returning valve;
B, then the dope obtained through the process of one-level carnallite release unit in concentrated water tank to be sent in secondary carnallite release unit circular treatment 5 ~ 10 minutes, utilize absorption principle to be removed by carnallite further, make to heat up and enter MVR evaporation and crystallization system except carnallite dope obtains heat and carry out evaporative crystallization.
As preferably, described MVR evaporative crystallization technique comprises the steps:
A, first enter evaporating chamber by the dope going denier carnallite technique to obtain by feeding engine d, heat exchanger passes into live steam and heats dope, in dope evaporation process two sections of steam of output can enter Roots's steam recompression machine by vapor (steam) temperature raise continue to enter heat exchanger to dope heating evaporation, without the need to continue supplement original vol saturated vapor.
B, dope carry out evaporation and reach hypersaturated state crystallize out, then enter suction filtration tank from evaporating chamber discharge and carry out Separation of Solid and Liquid, mother liquor is stored in filtrate tank and returns evaporating chamber and continue evaporative crystallization under suction function, and evaporative crystallization salt out contains sodium chloride and reaches more than 76% and can be used for papermaking, snow melting agent or chlor-alkali industry.
Beneficial effect of the present invention is:
The chloro ion-containing solution that tertiary effluent salt elution technique of the present invention produces enters coagulative precipitation tank, moisture 40%-50% and containing CL ion lower than 1% flying dust enter the heavy metal that mud collecting pit carries out in microbial attack bioxin and flying dust, directly can be used as the raw material of construction material through the flying dust of microbial attack bioxin.This microorganism is reusable, namely completes flying dust water yield 1:8 tertiary effluent and washes system.Three grades of chemicals dosing plants are same set of chemicals dosing plant, and automatic control flow is thrown in respectively, can send alarm when dose is not enough.The leaching technology of microorganism applies the direct effect of specific microorganism or the heavy metal ion in solid phase material is dissolved the process discharging into liquid phase by redox complexing acidolysis etc. by the indirectly-acting of its metabolin under normal temperature and pressure conditions.
In bundle glue strengthening removal heavy metal technique of the present invention, because incineration of refuse flyash contains many kinds of metal ions, coagulative precipitation tank adds solution mass ratio when stirring is the anion active agent of one thousandth to thousand/five, large molecule is formed thus precipitation after impelling the Van der Waals force polymerization between multiple dispersed metal ion, after static half an hour to one hour after most heavy metal ion precipitation, get supernatant and enter the heavy metal that composite bag type filter will not precipitate completely, contaminant filter falls.Coagulative precipitation tank precipitation enter mud collecting pit carry out pre-mummification laggard enter cement kiln burn, thus solve the pollution of incineration of refuse flyash heavy metal.In this technique anion active agent after adding again sedimentation and filtration fall, therefore do not cause the secondary pollution of solution, to subsequent film technique, evaporative crystallization etc. do not impact and obtain harmlessness disposing.
In nanofiltration technique of the present invention, because of in the washing water after flying dust washing, containing a large amount of calcium ions and magnesium ions, make the blocking that can cause subsequent film technique after concentrating.The separating mechanism of NF membrane is for screening and dissolve and spread and deposit, while there is again electrical charge rejection effect, effectively can remove all kinds of materials that divalence and multivalent ion, removal molecular weight are greater than 200, can partly remove monovalention and molecular weight lower than 200 material; The separating property of NF membrane is obviously better than ultrafiltration and micro-filtration, and first removed by the residue calcium magnesium in washing water with nanofiltration, the water of the dilute side of output enters intermediate water tank, can enter in counter-infiltration pre-concentration technique.
In counter-infiltration pre-concentration technique of the present invention, being motive force with pressure differential, is a kind of UF membrane operation of isolating solvent from solution, because it is contrary with the direction of naturally osmotic, therefore claims counter-infiltration.According to the different osmotic of various material, just can use the reverse osmosis pressure being greater than osmotic pressure, i.e. hyperfiltration, reach separation, extraction, purifying and concentrated object.Through the water of removing hardness, directly can enter counter-infiltration, by counter-infiltration pre-concentration, 6%-8% can be concentrated into washing water.The fresh water of output can enter water wash system water scouring water.
Of the present inventionly go denier carnallite technique can remove denier carnallite and carried out the recycling of the energy, due to the uncertainty of each supplied materials of incineration of refuse flyash, the blocking of the crystallizer that avoids evaporating, therefore set up before evaporative crystallization and go denier carnallite technique.Carry out high temperature (temperature is upgraded to 80-110 DEG C) process after the dope of concentrated water tank enters flat ultra micro water filtration film one-level carnallite release unit the carnallite of high temperature section is removed, after utilize absorption principle to be removed by carnallite further through secondary carnallite release unit, the carnallite Song Weifei factory and office reason filtered out, processing cost is very low.
The nearly saturation state water yield is also less because dope has been concentrated into for MVR evaporative crystallization technique of the present invention, so select forced-circulation evaporation crystallizer, dope enters evaporating chamber, heat exchanger passes into live steam and heats dope, in dope evaporation process two sections of steam of output can enter Roots's steam recompression machine steam temperature rise is continued enter heat exchanger to dope heating evaporation, original vol saturated vapor is supplemented without the need to continuing, dope carries out evaporation and reaches hypersaturated state crystallize out, then enter suction filtration tank from evaporating chamber discharge and carry out Separation of Solid and Liquid, mother liquor is got back to evaporating chamber and is continued evaporative crystallization.Because removing a large amount of carnallite, evaporative crystallization salt out contains sodium chloride and reaches more than 76% and can be used for papermaking, snow melting agent etc., processes this system and utilizes Roots's steam recompression technology, greatly save operation energy consumption.
Accompanying drawing illustrates:
Below in conjunction with accompanying drawing, the present invention is described further:
Fig. 1 is process chart of the present invention;
Fig. 2 is the flow chart that incineration of refuse flyash tertiary effluent salt elution of the present invention and microorganism remove bioxin technique;
Fig. 3 is the flow chart of bundle glue of the present invention strengthening removal heavy metal technique;
Fig. 4 is the flow chart of nanofiltration technique of the present invention and counter-infiltration pre-concentration technique;
Fig. 5 is the flow chart going denier carnallite technique of the present invention;
Fig. 6 is the flow chart of MVR evaporative crystallization technique of the present invention.
Detailed description of the invention:
Embodiment, is shown in accompanying drawing 1 ~ 6, a kind of garbage flying ash cement kiln synergic processing method, and it comprises following technical process:
(1) incineration of refuse flyash tertiary effluent salt elution and microorganism remove bioxin technique;
(2) glue strengthening removal heavy metal technique is restrainted;
(3) nanofiltration technique;
(4) counter-infiltration pre-concentration technique;
(5) denier carnallite technique is gone;
(6) MVR evaporative crystallization technique.
Described incineration of refuse flyash tertiary effluent salt elution and microorganism are removed bioxin technique and comprise the steps: that its technique adopts incineration of refuse flyash tertiary effluent salt elution and microorganism to remove bioxin device I and completes.
A, washing: incineration of refuse flyash is blown into conveying worm a2 from flying dust storage 1, agitator tank a3 is entered through conveying worm a, add certain water gaging, and the weight ratio of flying dust and water is 1:3, flying dust 1000kg, water 3000kg, described agitator tank a is communicated with respectively water inlet pipe a4 and chemical feed pipe a5, and the volume of agitator tank a is 1.35m
3, the power of agitator tank a is 2.2kw, and to add quality in whipping process be that the chaotropic agent of 1% of flying dust carries out stirring 20 minutes, stir fully and obtain mud, the lower end of agitator tank a is connected to slush pump a6, and the power of slush pump a is 5.5kw, and transfer rate is 0 ~ 50m
3/ h, the mud in agitator tank a is conveyed into buffer tank a7 by slush pump a, and the power of buffer tank a is 0.75kw, and the volume of buffer tank a is 1.35m
3.
B, dehydration: the mud in buffer tank a is transported to horizontal centrifuge a9 by slush pump b8 and dewaters, mud is isolated the flying dust of chloro ion-containing solution and moisture Ji bioxin, the moisture content of the flying dust of moisture Ji bioxin is 40%-50%, chloro ion-containing solution enters coagulative precipitation tank, and moisture content is that the flying dust of the moisture Ji bioxin of 40%-50% enters agitator tank b; The slag notch of described horizontal centrifuge a is connected to conveying worm b10, and the liquid outlet of horizontal centrifuge a is connected to coagulative precipitation tank 12 by fluid pipeline 11; Described conveying worm b is provided with two discharging openings.
C, secondary are washed: flying dust that is moisture and bioxin is conveyed into agitator tank b through conveying worm b, and carrying out stirring washing with the weight ratio of initial flying dust and water for 1:3 adds water, adding quality in whipping process is that the chaotropic agent of 1% of initial flying dust carries out stirring 30 minutes; Stir fully and obtain secondary mud; The discharging opening of each conveying worm b is connected to an agitator tank b13, and the power of each agitator tank b is 2.2KW, and volume is 0.8m
3, stir fully and obtain secondary mud, the secondary mud in each agitator tank b sends into buffer tank b15 through slush pump c14, and the power of slush pump c is 5.5kw, and transfer rate is 0 ~ 50m
3the power of/h, buffer tank b is 0.75kw, and the volume of buffer tank a is 1.35m
3, the slurry in buffer tank b is sent into horizontal centrifuge b17 through slush pump d16 and is dewatered, and the power of slush pump d is 1.5kw, and transfer rate is 0 ~ 1.2m
3/ h.
D, second dehydration: secondary mud is transported to horizontal centrifuge b through buffer tank b and dewaters, and the slag notch of horizontal centrifuge b is connected to conveying worm c18, and the liquid outlet of horizontal centrifuge b is connected to coagulative precipitation tank by fluid pipeline; Described conveying worm c is provided with two discharging openings, the discharging opening of each conveying worm c is connected to an agitator tank c19, slurries in each agitator tank c send into buffer tank c21 through slush pump e20, slurry in buffer tank c is sent into horizontal centrifuge c through slush pump f22 and is dewatered, and the charging aperture of described horizontal centrifuge c is connected to the discharging opening of slush pump f; The slag notch of described horizontal centrifuge c is connected to cement kiln, mud is isolated the flying dust of chloro ion-containing solution and the moisture Ji bioxin of secondary, the moisture content of the flying dust of the moisture Ji bioxin of secondary is 40%-50%, chloro ion-containing solution enters coagulative precipitation tank, and the flying dust of the moisture Ji bioxin of secondary enters agitator tank c;
The fly ash carry of the moisture Ji bioxin of e, secondary to agitator tank c, and carries out stirring washing with the weight ratio of initial flying dust and water for 1:2 adds water, and adding quality in whipping process is that the chaotropic agent of 1% of initial flying dust carries out stirring 20 minutes; Stir fully and obtain three mud;
F, three mud enter horizontal centrifuge c23 and dewater, and the charging aperture of horizontal centrifuge c is connected to the discharging opening of slush pump f; The slag notch of described horizontal centrifuge c is connected to cement kiln 24.Mud is isolated the flying dust of chloro ion-containing solution and three moisture Ji bioxin, the moisture content of the flying dust of three moisture Ji bioxin is 40%-50%, chloro ion-containing solution enters coagulative precipitation tank, the flying dust of three moisture Ji bioxin and chloride ion-containing enter lower than the flying dust of 1% heavy metal that mud collecting pit carries out in microbial attack bioxin and ash, flying dust through microbial attack bioxin can directly as the raw material of construction material, this microorganism is reusable, and the tertiary effluent namely completing flying dust and water yield 1:8 washes system.
Described each agitator tank b is connected to water inlet pipe b, each agitator tank c is connected to water inlet pipe c, described water inlet pipe a, water inlet pipe b are connected with inlet water tank 25 respectively with water inlet pipe c.
Described each agitator tank b is connected to chemical feed pipe b, each agitator tank c is connected to chemical feed pipe c, described chemical feed pipe a, chemical feed pipe b and chemical feed pipe c are connected on chemicals dosing plant 26.
The flow that the liquid outlet parallel join of described chemicals dosing plant has three groups of automatic control flow devices, 27, three groups of automatic control flow devices to control in chemical feed pipe a, chemical feed pipe b and chemical feed pipe c respectively, can send alarm when dose is not enough.
Described bundle glue strengthening removal heavy metal technique comprises the steps: that its technique adopts bundle glue strengthening removal heavy metal device II to complete.
The chloro ion-containing solution obtained in a, step 1 enters coagulative precipitation tank 12, and the left end of described coagulative precipitation tank is connected to two agitator tank d29 by delivery pump a28, is provided with minimum liquid level line and the highest liquid level line in agitator tank d, is convenient to control the liquid level in agitator tank d.And each agitator tank d is communicated with liquid-feeding tube 30 and chemical feed pipe 31; Liquid-feeding tube place enters tertiary effluent and washes rear chloro ion-containing solution, chemical feed pipe place adds anion active agent and stirs, and the quality of anion active agent accounts for 1 ‰ ~ 5 ‰ of chloro ion-containing solution quality, large molecule is formed thus precipitation after making multiple dispersed metal ionic polymerization, after static 0.5 ~ 1 hour, the heavy metal ion of 85 ~ 95% is precipitated; Liquid-feeding tube is provided with priming valve 32, chemical feed pipe is provided with the dosing valve 33 controlling dosing flow.
Described chemical feed pipe is connected with chemicals dosing plant 35 by dosing pump 34, and the power of dosing pump is 0.37KW, and chemicals dosing plant is connected with water pipe 36, and the nearly running water in water pipe place is convenient to mix with liquid, the heavy metal precipitation thing of described coagulative precipitation tank bottom transports into centrifugal dehydrator 37 and dewaters, the clear liquid on coagulative precipitation tank top is conveyed into Buffer Pool 38, liquid in Buffer Pool is conveyed into composite bag type filter 40 by delivery pump b39, composite bag type filter has two, each composite bag type filter top is provided with inlet, bottom is provided with liquid outlet, lower end is provided with sewage draining exit, the heavy metal do not precipitated completely and contaminant filter fall by composite bag type filter, the heavy metal obtained and impurity transport into centrifugal dehydrator by sewage draining exit and dewater, the saliferous rate obtained is that the solution of 1-2% enters nanofiltration treating apparatus III by liquid outlet and processes.
B, the then clear liquid taken out on coagulative precipitation tank enter composite bag type filter and the heavy metal do not precipitated completely, contaminant filter are fallen, and obtain the solution that saliferous rate is 1-2%;
C, 85 ~ 95% heavy metal ion of precipitation are transported enter mud collecting pit and carry out pre-mummification, pre-mummification laggard enter cement kiln burn, thus solve the pollution of incineration of refuse flyash heavy metal.In bundle glue strengthening removal heavy metal technique anion active agent after adding again sedimentation and filtration fall, therefore do not cause the secondary pollution of solution, subsequent evaporation crystallization processes etc. do not impacted, obtains harmlessness disposing.
Described nanofiltration technique comprises the steps: that its technique adopts nanofiltration treating apparatus III to complete.Technical process is: be that the solution of 1-2% enters nanofiltration membrane component 41 by feeding engine a by saliferous rate, enter antisludging agent by chemicals dosing plant b in nanofiltration membrane component simultaneously, saliferous rate is that the calcium magnesium in the solution of 1-2% is removed by nanofiltration membrane component, and the water of output enters intermediate water tank 42.
Described counter-infiltration pre-concentration technique comprises the steps: that its technique adopts counter-infiltration pre-concentration treating apparatus IV to complete.
Technical process is: the water of intermediate water tank is sent into reverse osmosis membrane assembly 43 with feeding engine b again and carried out counter-infiltration pre-concentration, enter antisludging agent by chemicals dosing plant c in reverse osmosis membrane assembly simultaneously, water can be concentrated into 6% ~ 8% by reverse osmosis membrane assembly, reverse osmosis membrane assembly output fresh water enters reverse osmosis produced water tank, and the water in reverse osmosis produced water tank can enter incineration of refuse flyash washing moisturizing and use.
Described go denier carnallite technique comprise the steps: its technique adopt go denier carnallite device V.
A, 6% ~ 8% dope enter concentrated water tank 44, heat up after the dope of concentrated water tank enters flat ultra micro water filtration film one-level carnallite release unit 45 by separation feeding engine c, temperature is upgraded to 80-110 DEG C and carries out high temperature circulation process 5 ~ 10 minutes, the carnallite of high temperature section is removed, carnallite precipitation enters carnallite collecting pit 46, and the dope obtained turns back to concentrated water tank by dope material returning valve;
B, then the dope obtained through the process of one-level carnallite release unit in concentrated water tank to be sent in secondary carnallite release unit 47 circular treatment 5 ~ 10 minutes, utilize absorption principle to be removed by carnallite further, make to heat up and enter MVR evaporation and crystallization system except carnallite dope obtains heat and carry out evaporative crystallization.
Described MVR evaporative crystallization technique comprises the steps: that its technique adopts MVR evaporated crystallization device VI to complete.
A, first enter evaporating chamber 48 by the dope going denier carnallite technique to obtain by feeding engine d, heat exchanger 49 passes into live steam and heats dope, in dope evaporation process two sections of steam of output can enter Roots's steam recompression machine 50 by vapor (steam) temperature raise continue to enter heat exchanger to dope heating evaporation, without the need to continue supplement original vol saturated vapor.
B, dope carry out evaporation and reach hypersaturated state crystallize out, then enter suction filtration tank 51 from evaporating chamber by discharging pump discharge and carry out Separation of Solid and Liquid, vavuum pump is provided with in Roots's steam recompression machine, vavuum pump filtrate tank connects, mother liquor under vavuum pump effect in filtrate tank is negative pressure state, the mother liquor be stored under suction function in filtrate tank 52 returns evaporating chamber and continues evaporative crystallization, and evaporative crystallization salt out contains sodium chloride and reaches more than 76% and can be used for papermaking, snow melting agent or chlor-alkali industry.
Above-described embodiment is the specific descriptions of carrying out the present invention; just the present invention is further described; can not be interpreted as limiting the scope of the present invention, those skilled in the art makes some nonessential improvement according to the content of foregoing invention and adjustment all falls within protection scope of the present invention.
Claims (8)
1. a garbage flying ash cement kiln synergic processing method, is characterized in that: it comprises following technical process:
(1) incineration of refuse flyash tertiary effluent salt elution and microorganism remove bioxin technique;
(2) glue strengthening removal heavy metal technique is restrainted;
(3) nanofiltration technique;
(4) counter-infiltration pre-concentration technique;
(5) denier carnallite technique is gone;
(6) MVR evaporative crystallization technique.
2. a kind of garbage flying ash cement kiln synergic processing method according to claim 1, is characterized in that: described incineration of refuse flyash tertiary effluent salt elution and microorganism are removed bioxin technique and comprise the steps:
A, washing: incineration of refuse flyash is blown into conveying worm a from flying dust storage, agitator tank a is entered through conveying worm a, add certain water gaging, and the weight ratio of flying dust and water is 1:3, adding quality in whipping process is that the chaotropic agent of 1% of flying dust carries out stirring 20 minutes, stirs fully and obtains mud;
B, dehydration: mud is transported to horizontal centrifuge a through buffer tank a and dewaters, mud is isolated the flying dust of chloro ion-containing solution and moisture Ji bioxin, the moisture content of the flying dust of moisture Ji bioxin is 40%-50%, chloro ion-containing solution enters coagulative precipitation tank, and the flying dust of moisture Ji bioxin enters agitator tank b;
C, secondary are washed: flying dust that is moisture and bioxin is conveyed into agitator tank b through conveying worm b, and carrying out stirring washing with the weight ratio of initial flying dust and water for 1:3 adds water, adding quality in whipping process is that the chaotropic agent of 1% of initial flying dust carries out stirring 20 minutes; Stir fully and obtain secondary mud;
D, second dehydration: secondary mud is transported to horizontal centrifuge b through buffer tank b and dewaters, mud is isolated the flying dust of chloro ion-containing solution and the moisture Ji bioxin of secondary, the moisture content of the flying dust of the moisture Ji bioxin of secondary is 40%-50%, chloro ion-containing solution enters coagulative precipitation tank, and the flying dust of the moisture Ji bioxin of secondary enters agitator tank c;
The fly ash carry of the moisture Ji bioxin of e, secondary to agitator tank c, and carries out stirring washing with the weight ratio of initial flying dust and water for 1:2 adds water, and adding quality in whipping process is that the chaotropic agent of 1% of initial flying dust carries out stirring 20 minutes; Stir fully and obtain three mud;
F, three mud enter horizontal centrifuge c and dewater, mud is isolated the flying dust of chloro ion-containing solution and three moisture Ji bioxin, the moisture content of the flying dust of three moisture Ji bioxin is 40%-50%, chloro ion-containing solution enters coagulative precipitation tank, the flying dust of three moisture Ji bioxin and chloride ion-containing enter lower than the flying dust of 1% heavy metal that mud collecting pit carries out in microbial attack bioxin and ash, flying dust through microbial attack bioxin can directly as the raw material of construction material, this microorganism is reusable, namely the tertiary effluent completing flying dust and water yield 1:8 washes system.
3. a kind of garbage flying ash cement kiln synergic processing method according to claim 2, it is characterized in that: the chaotropic agent that adds for three times that described incineration of refuse flyash tertiary effluent salt elution and microorganism are removed in bioxin technique is all adopt same set of chemicals dosing plant a, and adopt automatic control flow to throw in respectively, can alarm be sent when dose is not enough.
4. a kind of garbage flying ash cement kiln synergic processing method according to claim 2, is characterized in that: described bundle glue strengthening removal heavy metal technique comprises the steps:
The chloro ion-containing solution obtained in a, technical process 1 enters coagulative precipitation tank, in coagulative precipitation tank, add anion active agent stir, and the quality of anion active agent accounts for 1 ‰ ~ 5 ‰ of chloro ion-containing solution quality, large molecule is formed thus precipitation after making multiple dispersed metal ionic polymerization, after static 0.5 ~ 1 hour, the heavy metal ion of 85 ~ 95% is precipitated;
B, the then clear liquid taken out on coagulative precipitation tank enter composite bag type filter and the heavy metal do not precipitated completely, contaminant filter are fallen, and obtain the solution that saliferous rate is 1-2%;
C, 85 ~ 95% heavy metal ion of precipitation are transported enter mud collecting pit and carry out pre-mummification, pre-mummification laggard enter cement kiln burn, thus solve the pollution of incineration of refuse flyash heavy metal.
5. a kind of garbage flying ash cement kiln synergic processing method according to claim 4, it is characterized in that: described nanofiltration technique comprises the steps: that saliferous rate is that the solution of 1-2% enters nanofiltration membrane component by feeding engine a, enter antisludging agent by chemicals dosing plant b in nanofiltration membrane component simultaneously, saliferous rate is that the calcium magnesium in the solution of 1-2% is removed by nanofiltration membrane component, and the water of output enters intermediate water tank.
6. a kind of garbage flying ash cement kiln synergic processing method according to claim 5, it is characterized in that: described counter-infiltration pre-concentration technique comprises the steps: that the water of intermediate water tank is sent into reverse osmosis membrane assembly with feeding engine b again and carried out counter-infiltration pre-concentration, enter antisludging agent by chemicals dosing plant c in reverse osmosis membrane assembly simultaneously, water can be concentrated into 6% ~ 8% by reverse osmosis membrane assembly, reverse osmosis membrane assembly output fresh water enters reverse osmosis produced water tank, and the water in reverse osmosis produced water tank can enter incineration of refuse flyash washing moisturizing and use.
7. a kind of garbage flying ash cement kiln synergic processing method according to claim 6, is characterized in that: described in go denier carnallite technique to comprise the steps:
A, 6% ~ 8% dope enter concentrated water tank, heat up after the dope of concentrated water tank enters flat ultra micro water filtration film one-level carnallite release unit by separation feeding engine c, temperature is upgraded to 80-110 DEG C and carries out high temperature circulation process 5 ~ 10 minutes, the carnallite of high temperature section is removed, carnallite precipitation enters carnallite collecting pit, and the dope obtained turns back to concentrated water tank by dope material returning valve;
B, then the dope obtained through the process of one-level carnallite release unit in concentrated water tank to be sent in secondary carnallite release unit circular treatment 5 ~ 10 minutes, utilize absorption principle to be removed by carnallite further, make to heat up and enter MVR evaporation and crystallization system except carnallite dope obtains heat and carry out evaporative crystallization.
8. a kind of garbage flying ash cement kiln synergic processing method according to claim 7, is characterized in that: described MVR evaporative crystallization technique comprises the steps:
A, first enter evaporating chamber by the dope going denier carnallite technique to obtain by feeding engine d, heat exchanger passes into live steam and heats dope, in dope evaporation process two sections of steam of output can enter Roots's steam recompression machine by vapor (steam) temperature raise continue to enter heat exchanger to dope heating evaporation, without the need to continue supplement original vol saturated vapor.
B, dope carry out evaporation and reach hypersaturated state crystallize out, then enter suction filtration tank from evaporating chamber discharge and carry out Separation of Solid and Liquid, mother liquor is stored in filtrate tank and returns evaporating chamber and continue evaporative crystallization under suction function, and evaporative crystallization salt out contains sodium chloride and reaches more than 76% and can be used for papermaking, snow melting agent or chlor-alkali industry.
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