CN105461096B - A kind of incineration of refuse flyash washing slurries solid-liquid separating method - Google Patents

A kind of incineration of refuse flyash washing slurries solid-liquid separating method Download PDF

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Publication number
CN105461096B
CN105461096B CN201410394312.5A CN201410394312A CN105461096B CN 105461096 B CN105461096 B CN 105461096B CN 201410394312 A CN201410394312 A CN 201410394312A CN 105461096 B CN105461096 B CN 105461096B
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solid
incineration
decanter centrifuge
filtrate
separated
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CN105461096A (en
Inventor
顾军
朱延臣
张国亮
芦澍
王树
练礼财
周治平
蔡文涛
殷杰
黄岚
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Beijing Jinyu water environmental protection science and Technology Co Ltd
Beijing Building Materials Academy of Sciences Research
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BEIJING LIULIHE CEMENT Co Ltd
Beijing Building Materials Academy of Sciences Research
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Abstract

The present invention provides a kind of incineration of refuse flyash to wash slurries solid-liquid separating method, this method is separated by solid-liquid separation by the way of flocculant using two-stage series connection decanter centrifuge and adding, operating procedure includes: that incineration of refuse flyash washing slurry liquid 1) is pumped to level-one decanter centrifuge with feed pump first to be separated by solid-liquid separation, most of insoluble matter, which is separated, to be formed a mud cake and waits for subsequent processing, remaining insoluble matter and water form first-time filtrate and enters filtrate tank;2) first-time filtrate in filtrate tank is then pumped to second level decanter centrifuge with feed pump, while adds flocculant on feed pipe, first-time filtrate is after being separated by solid-liquid separation, and secondary mud cake converges with mud cake of step 1), and secondary filtrate enters clean water tank.The present invention has the advantages that separation is thorough, moisture content of the cake is low, chloride ion removal effect is significant in flying dust and disposing capacity is big compared with vacuum filter.

Description

A kind of incineration of refuse flyash washing slurries solid-liquid separating method
Technical field
The present invention relates to the technical fields of incineration of refuse flyash washing process, burn in particular, being related to a kind of rubbish It burns flying dust and washes slurries solid-liquid separating method.
Technical background
Consumer waste incineration has the characteristics that processing speed is fast, occupied area is few, minimizing and innoxious significant effect, closely Become one of main disposal options of domestic waste over year.Incineration of refuse flyash be generated in Refuse Incineration Process it is secondary Pollutant, yield are typically about the 3-5% of waste incineration total amount, wherein being enriched plurality of heavy metal and the organic dirt of dioxin Object is contaminated, it is big to environmental hazard, it needs to be managed and dispose by hazardous waste, can only enter hazardous waste landfill in the past and fill out Bury, land occupation resource and also landfill it is costly.
It using cement kiln cement baking is after washing that a kind of advanced incineration of refuse flyash is harmless by incineration of refuse flyash Change the new technology with resource utilization.Chloride ion content is high in incineration of refuse flyash, directly can generate skinning as cement raw material And blocking, influence the normal operation of cement kiln.Therefore incineration of refuse flyash needs to reduce chloride ion content therein by washing.
The slurries solid-liquid separating method of incineration of refuse flyash washing at present predominantly uses vacuum filter to be filtered, but by In incineration of refuse flyash CaO content is high, partial size is small, large specific surface area, and there is preferable hydrophily, so that vacuum filter filters The problem of occurring filter cloth blocking and seriously corroded, solid-liquid separation effect difference in the process and being unable to continuous and steady operation, causes Moisture content of the cake is high after separation, and the effect for removing chloride ion in flying dust is poor, while disposing capacity is low.
Summary of the invention
In order to solve the problems in the existing technology, the object of the present invention is to provide a kind of incineration of refuse flyash washing slurries Liquid solid-liquid separating method substitutes vacuum filter by using decanter centrifuge and adds flocculant, so that mud after being separated by solid-liquid separation Cake moisture content is lower, removes the significant effect of chloride ion in flying dust, while disposing capacity improves.
To achieve the goals above, the present invention adopts the following technical scheme that:
A kind of incineration of refuse flyash washing slurries solid-liquid separating method, using two-stage series connection decanter centrifuge and adds flocculation The mode of agent is separated by solid-liquid separation, and operating procedure includes: 1) to be first pumped to incineration of refuse flyash washing slurry liquid with feed pump Level-one decanter centrifuge is separated by solid-liquid separation, and most of insoluble matter, which is separated, to be formed a mud cake and wait for subsequent processing, remaining Insoluble matter and water form first-time filtrate and enter filtrate tank;2) first-time filtrate in filtrate tank is then pumped to second level with feed pump Decanter centrifuge, while flocculant is added on feed pipe, first-time filtrate is after being separated by solid-liquid separation, secondary mud cake and step 1) one Secondary mud cake converges, and secondary filtrate enters clean water tank.
Scheme is further: the feed pipe is equipped with pipe-line mixer, and flocculant concentration is into pipe-line mixer.
Scheme is further: the flocculant is PAM, and PAM dosage is the 0.5- of insoluble matter weight in first-time filtrate 3‰。
Scheme is further: the separation factor and draw ratio of the second level decanter centrifuge are all larger than the sleeping spiral shell centrifugation of level-one Machine.
Scheme is further: the feed pump is frequency conversion slush pump.
Technical principle of the invention are as follows: incineration of refuse flyash is washed by big portion in slurries using level-one decanter centrifuge first Insoluble matter is divided to separate, the insoluble matter partial size insoluble matter grain that is larger, and not being separated that this general step is separated Diameter is smaller, if being applied alone decanter centrifuge to separate first-time filtrate again, separation can be extremely difficult, and separative efficiency is very low;This Invention adds flocculant on second level horizontal centrifugal machine feeding tube road, using the powerful cohesion ability of flocculant, increases primary filter Insoluble matter partial size and be to be allowed to put up a bridge to become wadding body in liquid, into second level decanter centrifuge after realize point of insoluble matter and water quickly From filtrate is very clear after separation, and separating effect is ideal.
The present invention has the advantage that (1) separation thoroughly, general vacuum filter filters compared with vacuum filter Filtrate insoluble matter weight content is 3% or so afterwards, and the final filtrate insoluble matter weight content of the present invention can reach 0.5% or less; (2) moisture content of the cake is low after separating, and the moisture content of mud cake is 45% or more after general vacuum filter filters, and mud cake of the present invention Moisture content is in 35-40%;(3) chloride ion removal effect is significant in flying dust, is such as separated by solid-liquid separation using vacuum filter, generally Flying dust after washing and separating three times, after mud cake drying chloride ion weight content 1% or so, and use the method for the present invention into Row is separated by solid-liquid separation, and chloride ion weight content is 0.5% or so after mud cake drying;(4) disposing capacity is big, due to vacuum filter by It is formed on the influence of flying dust material, filter cloth is frequently occluded, it is difficult to which continuous operation results in disposition amount and substantially reduces, and decanter centrifuge Substantially it is not influenced by flying dust material, treating capacity is very stable always.
Specific embodiment
Technical solution of the present invention is described in further detail below.
A kind of incineration of refuse flyash washing slurries solid-liquid separating method, using two-stage series connection decanter centrifuge and adds flocculation The mode of agent is separated by solid-liquid separation, and operating procedure includes:
1) first with feed pump by the incineration of refuse flyash washing slurry liquid stirred evenly be pumped to level-one decanter centrifuge into Row is separated by solid-liquid separation, and most of insoluble matter, which is separated, to be formed a mud cake and wait for subsequent processing, remaining insoluble matter and water form one Secondary filtrate enters filtrate tank.
To guarantee that 1) level-one decanter centrifuge has preferable task performance and higher separative efficiency to this step, controls rubbish Insoluble matter weight content≤30% of rubbish flying ash washing slurries, while separation factor >=2200 of level-one decanter centrifuge, Draw ratio >=3.5.
2) first-time filtrate in filtrate tank is then pumped to second level decanter centrifuge with feed pump, while in feed pipe On add flocculant, after being separated by solid-liquid separation, secondary mud cake converges first-time filtrate with mud cake of step 1), and secondary filtrate enters clear Water pot.
For guarantee flocculant flocculation and decanter centrifuge have preferable separating effect, need flocculant with it is secondary Sufficiently, pipe-line mixer is arranged, by flocculant concentration into pipe-line mixer in filtrate mixing on feed pipe;Above-mentioned flocculant For PAM, PAM selection criteria are as follows: flocculation ability is strong, alumen ustum is big, wadding body is non-breakable;The concentration that PAM is prepared is preferably 0.5- 2.5 ‰, PAM dosage are the 0.5-3 ‰ of insoluble matter weight in first-time filtrate.
In order to reduce PAM dosage, the separation factor and draw ratio of above-mentioned second level decanter centrifuge be all larger than level-one crouch spiral shell from Scheming, separation factor >=2600 that second level decanter centrifuge preferably selects, draw ratio >=4;The selection of second level decanter centrifuge is biggish Separation factor and draw ratio can make centrifugal force/gravity increase and extended residence time, to further improve separation effect PAM dosage can be saved and be reduced to rate under conditions of secondary centrifuging filtrate insolubles content reaches requirement.
The feed pump of above-mentioned level-one decanter centrifuge and second level decanter centrifuge is frequency conversion slush pump.

Claims (4)

1. a kind of incineration of refuse flyash washes slurries solid-liquid separating method, it is characterised in that: use two-stage series connection decanter centrifuge And the mode for adding flocculant is separated by solid-liquid separation, operating procedure includes: 1) first to be washed incineration of refuse flyash with feed pump Slurries are pumped to level-one decanter centrifuge and are separated by solid-liquid separation, most of insoluble matter be separated to be formed a mud cake wait for it is subsequent Processing, remaining insoluble matter and water form first-time filtrate and enter filtrate tank;2) then with feed pump by the first-time filtrate in filtrate tank It is pumped to second level decanter centrifuge, while adding flocculant on feed pipe, first-time filtrate is after being separated by solid-liquid separation, secondary mud cake Converge with mud cake of step 1), secondary filtrate enters clean water tank, separation factor >=2200 of level-one decanter centrifuge, draw ratio >=3.5, the separation factor and draw ratio of second level decanter centrifuge are all larger than level-one decanter centrifuge, point of second level decanter centrifuge From factor >=2600, draw ratio >=4.
2. a kind of incineration of refuse flyash according to claim 1 washes slurries solid-liquid separating method, it is characterised in that: described Feed pipe is equipped with pipe-line mixer, and flocculant concentration is into pipe-line mixer.
3. a kind of incineration of refuse flyash according to claim 2 washes slurries solid-liquid separating method, it is characterised in that: described Flocculant is PAM, and PAM dosage is the 0.5-3 ‰ of insoluble matter weight in first-time filtrate.
4. a kind of incineration of refuse flyash according to claim 1 to 3 washes slurries solid-liquid separating method, special Sign is: the feed pump is frequency conversion slush pump.
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Publication number Priority date Publication date Assignee Title
CN108483958B (en) * 2018-06-07 2020-04-17 山东大学 Resource utilization method of waste incineration fly ash and industrial solid waste
CN109500061B (en) * 2018-12-05 2020-05-12 北京建筑材料科学研究总院有限公司 Method for combined utilization of incineration fly ash and bypass ash

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Address after: 100041 Beijing city Shijingshan District Jinding Road No. 69 hospital

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