CN104692682A - Garbage incineration fly ash filter cake modification method - Google Patents
Garbage incineration fly ash filter cake modification method Download PDFInfo
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- CN104692682A CN104692682A CN201310647247.8A CN201310647247A CN104692682A CN 104692682 A CN104692682 A CN 104692682A CN 201310647247 A CN201310647247 A CN 201310647247A CN 104692682 A CN104692682 A CN 104692682A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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Abstract
The invention discloses a garbage incineration fly ash filter cake modification method including: first, adding fly ash, sodium carbonate, coal ash and water into a first-stage water washing stirring tank for water washing for three times, using a vacuum filter for solid-liquid separation of filtrate and filter cake after each time of water washing; wherein filtrate separated by first time solid-liquid separation is sent into a sewage tank for subsequent wastewater treatment; the second time and third time solid-liquid separated filtrates are respectively used as the first time and second time water washing water; the third time water washing is clear water washing. The third time solid-liquid separated filter cake is a modified fly ash filter cake, due to the less looseness and smaller viscosity, the feed conveying is smooth, drying machine material attachment is reduced, the strength of material blocks formed during drying of the filter cake is small, wall scrapping is easy, and scattering is smooth, the fly ash filter cake drying process can be performed normally, the problems existed in the real engineering can be solved, and the cement kiln co processing garbage incineration fly ash technology can be improved.
Description
Technical field
The present invention relates to incineration of refuse flyash water-washing technique field, concretely, relate to a kind of method of modifying of incineration of refuse flyash filter cake.
Technical background
The refuse incineration and power generation journey that recent domestic rises, for innoxious, the minimizing of domestic waste, resource utilization contribute.But contain heavy metal in incineration of refuse flyash with pollutents such as dioxin, shown great attention to by environmental administration of various countries.In China, " National Hazard refuse register " clear stipulaties: domestic garbage incineration flyash belongs to Hazardous wastes.Therefore how treating refuse flying ash development process technology, becomes one of focus of environment in recent years protection area research.
Calcareous, siliceous in a large number owing to containing in incineration of refuse flyash, therefore can as the raw material of calcination of cement clinker, simultaneously in grog high-temperature burning process, effectively can decompose in flying dust and have high risks dioxin to human body, and plurality of heavy metal is solidificated in grog, therefore calcination of chamotte is a kind of method of effective treating refuse flying ash.But owing to containing Cl, SO in flying dust
3, K
2o, Na
2o etc. disturb the composition of manufacture of cement, and the heavy metal element existed in flying dust also can have certain influence to sinter leaching, therefore needs to carry out effective pre-treatment to incineration of refuse flyash, reduce and are unfavorable for the unwanted components such as Cl, S of manufacture of cement.
The pretreatment process of flying dust washing is have employed in the disclosed technical scheme of Chinese invention patent " a kind of method for the treatment of incinerated fly ash of domestic garbage with cooperation of cement kiln " (patent No. is ZL201010162532.7), the method adopts three grades of washing treatment unit combined by water washing tank and vacuum filter to wash and solid-liquid separation flying dust, filtrate after vacuum filter solid-liquid separation enters waste disposal plant process, and filter cake enters cement kiln high-temperature section calcining after drying machine drying.The method adopts water-washing technique to carry out pre-treatment to flying dust, effectively reduce component harmful to manufacture of cement in flying dust, increase substantially the ability of cement kiln synergic processing flying dust, but in Practical Project runs, because flying dust CaO content is high, particle diameter is little, specific surface area is large, the filter cake caking making to obtain through vacuum filter solid-liquid separation closely, viscosity is very large, cause the blocking of dryer feeding e Foerderanlage and dryer inside seriously to tie wall, have impact on the carrying out of flying dust filter cake drying course.
Summary of the invention
In order to solve above-mentioned problems of the prior art, the object of this invention is to provide a kind of method of modifying of incineration of refuse flyash filter cake, such that modified flying dust filter cake is comparatively loose, viscosity reduces, ensure that flying dust filter cake drying course normally carries out.
The method of modifying realizing a kind of incineration of refuse flyash filter cake of the present invention is:
1) in one-stage water wash stirred pot, add flying dust, sodium carbonate, flyash and water, wherein, sodium carbonate add-on is the 5-15% of flying dust weight, and flyash add-on is the 10-30% of flying dust weight, and the add-on of water is 2-4 times of flying dust weight;
2) open stirring and carry out first time washing, washing time is 20-30 minute, after having washed, flying dust slip is sent into one-level vacuum filter filter dehydration, solid-liquid separation filtrate and filter cake;
3) step 2) in the filter cake that obtains enter secondary washing stirred pot and carry out second time washing, washing time is 10-20 minute, after having washed, by flying dust slip feeding secondary vacuum filter filter dehydration, solid-liquid separation filtrate and filter cake;
4) step 3) in the filter cake that obtains enter tertiary effluent and wash stirred pot and carry out third time washing, washing time is 5-10 minute, after having washed, flying dust slip is sent into three grades of vacuum filter filter dehydrations, solid-liquid separation filtrate and filter cake, filter cake is modification flying dust filter cake of the present invention.
Above-mentioned steps 3) and step 4) described solid-liquid separation filtrate respectively as first time and second time washing with water; Step 4) washing of described third time washs for clear water; Step 2) described solid-liquid separation filtrate sends into sewage lagoon and carries out follow-up sewage disposal; Step 3) and step 4) in second time and third time washing water consumption with wash for the first time identical.
Described flyash is II level or III level flyash.
Modification flying dust filter cake of the present invention is delivered to dryer by feed conveying device, is transported to kiln tail high temperature section by metering conveyor after oven dry and carries out cement kiln calcining.
Know-why of the present invention is: owing to containing a large amount of calcium oxide in flying dust, calcium oxide is met water and is generated calcium hydroxide, calcium hydroxide is slightly soluble in water, form calcium hydroxide sol solution, cause flying dust filter cake viscosity very large, change calcium hydroxide into solubleness extremely low calcium carbonate by adding sodium carbonate, flying dust filter cake viscosity is reduced; The median size of flyash is larger than flying dust, by adding the diluting effect after macrobead, the viscosity of flying dust filter cake is reduced further, and the filtrating aid function of flyash also makes flying dust filter cake comparatively loose.Modification flying dust filter cake of the present invention because filter cake is loose, viscosity is little makes charging carry unobstructed, dryer knot wall to reduce, the material bulk strength that formed in oven dry of filter cake is little in addition, make to scrape wall easily, break up smoothly.
Beneficial effect of the present invention is: (1) does not change existing flying dust washing process substantially, workable; (2) flyash obtains recycling, achieves the object of the treatment of wastes with processes of wastes against one another; (3) because modified flying dust filter cake is comparatively loose, viscosity significantly reduces, ensure that flying dust filter cake drying course normally carries out, solve Practical Project Problems existing, the perfect technique of cement kiln associated treatment flying dust.
Accompanying drawing explanation
Fig. 1 is process flow sheet of the present invention.
In figure: 1-one-stage water wash stirred pot; 2-one-level vacuum filter; 3-secondary washing stirred pot; 4-secondary vacuum filter; 5-tertiary effluent washes stirred pot; 6-tri-grades of vacuum filters; 7-clean water basin; 8-2# filtrate tank; 9-1# filtrate tank; 10-sewage lagoon; 11-dryer.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
As shown in Figure 1: the present invention includes three grades of washing treatment unit combined by washing stirred pot and vacuum filter arranged, wherein, one-stage water wash stirred pot 1 output terminal is connected with one-level vacuum filter 2, one-level vacuum filter 2 is provided with 2 output ports, Single port is connected with sewage lagoon 10, and another port and secondary are washed stirred pot 3 and connected; Secondary washing stirred pot 3 output terminal connects with secondary vacuum filter 4, and secondary vacuum filter 4 is provided with 2 output ports, and one end is connected with 1# filtrate tank 9, and the other end and tertiary effluent are washed stirred pot 5 and be communicated with; The output terminal that tertiary effluent washes stirred pot 5 connects with three grades of vacuum filters 6, and three grades of vacuum filters 6 are provided with 2 output ports, and one end is connected with 2# filtrate tank 8, and the other end is communicated with dryer 11 by feed conveying device; In addition, 1# filtrate tank 9 and 2# filtrate tank 8 are washed stirred pot 3 with one-stage water wash stirred pot 1 and secondary respectively and are connected, and clean water basin 7 and tertiary effluent are washed stirred pot 5 and be connected.
The concrete operations realizing the method for modifying of a kind of incineration of refuse flyash filter cake of the present invention are:
1) in one-stage water wash stirred pot, flying dust, sodium carbonate, flyash and water is added, wherein, sodium carbonate add-on is the 5-15% of flying dust weight, flyash add-on is the 10-30% of flying dust weight, the add-on of water is 2-4 times of flying dust weight, and described flyash is II level or III level flyash;
2) open stirring and carry out first time washing, washing time is 20-30 minute, and after having washed, flying dust slip is sent into one-level vacuum filter filter dehydration, solid-liquid separation filtrate and filter cake, filtrate is sent into sewage lagoon and carried out follow-up sewage disposal;
3) step 2) in the filter cake that obtains enter secondary washing stirred pot and carry out second time and wash, water consumption is washed identical with first time, washing time is 10-20 minute, after having washed, flying dust slip is sent into secondary vacuum filter filter dehydration, solid-liquid separation filtrate and filter cake, filtrate enters 1# and washes stirred pot as first time water scouring water;
4) step 3) in the filter cake that obtains enter tertiary effluent and wash stirred pot and carry out third time washing, bath water is clear water, water consumption is washed identical with first time, washing time is 5-10 minute, after having washed, flying dust slip is sent into three grades of vacuum filter filter dehydrations, solid-liquid separation filtrate and filter cake, filtrate enters 2# and washes stirred pot as second time water scouring water, and filter cake is modification flying dust filter cake of the present invention.
Modification flying dust filter cake of the present invention is delivered to dryer by feed conveying device, be transported to kiln tail more than 1000 DEG C high temperature section by metering conveyor after oven dry to carry out cement kiln calcining dioxin and be completely broken down, and heavy metal is effectively fixed in cement clinker lattice, thus realize the innoxious and disposal of resources of flying dust.
Claims (3)
1. the method for modifying of an incineration of refuse flyash filter cake, it is characterized in that: 1) in one-stage water wash stirred pot, add flying dust, sodium carbonate, flyash and water, wherein, sodium carbonate add-on is the 5-15% of flying dust weight, flyash add-on is the 10-30% of flying dust weight, and the add-on of water is 2-4 times of flying dust weight; 2) open stirring and carry out first time washing, washing time is 20-30 minute, after having washed, flying dust slip is sent into one-level vacuum filter filter dehydration, solid-liquid separation filtrate and filter cake; 3) step 2) in the filter cake that obtains enter secondary washing stirred pot and carry out second time washing, washing time is 10-20 minute, after having washed, by flying dust slip feeding secondary vacuum filter filter dehydration, solid-liquid separation filtrate and filter cake; 4) step 3) in the filter cake that obtains enter tertiary effluent and wash stirred pot and carry out third time washing, washing time is 5-10 minute, after having washed, flying dust slip is sent into three grades of vacuum filter filter dehydrations, solid-liquid separation filtrate and filter cake.
2. the method for modifying of a kind of incineration of refuse flyash filter cake as claimed in claim 1, is characterized in that: step 3) and step 4) described solid-liquid separation filtrate respectively as first time and second time washing with water; Step 4) washing of described third time washs for clear water; Step 2) described solid-liquid separation filtrate sends into sewage lagoon and carries out follow-up sewage disposal; Step 3) and step 4) in second time and third time washing water consumption with wash for the first time identical.
3. the method for modifying of a kind of incineration of refuse flyash filter cake as claimed in claim 1, is characterized in that: described flyash is II level or III level flyash.
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| CN201310647247.8A CN104692682A (en) | 2013-12-06 | 2013-12-06 | Garbage incineration fly ash filter cake modification method |
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| CN201310647247.8A CN104692682A (en) | 2013-12-06 | 2013-12-06 | Garbage incineration fly ash filter cake modification method |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106032302A (en) * | 2016-06-16 | 2016-10-19 | 浙江富春江环保热电股份有限公司 | Waste incineration fly ash washing wastewater treatment method |
| CN108043859A (en) * | 2017-12-01 | 2018-05-18 | 中广核研究院有限公司 | A kind of domestic garbage incineration flyash innocuity disposal system and method |
| CN111346421A (en) * | 2020-03-13 | 2020-06-30 | 杭州科源节能技术有限公司 | Continuous washing system for fly ash washing and working method thereof |
| CN111359306A (en) * | 2020-03-13 | 2020-07-03 | 杭州科源节能技术有限公司 | Filter system for washing fly ash and filter method thereof |
| CN111389094A (en) * | 2020-03-13 | 2020-07-10 | 杭州科源节能技术有限公司 | Fly ash washing and filtering system and filtering method thereof |
| CN111589837A (en) * | 2020-04-12 | 2020-08-28 | 北京锐上思环保科技有限公司 | Reinforced desalting method for water washing pretreatment of fly ash |
| CN111774404A (en) * | 2020-07-04 | 2020-10-16 | 上海和惠生态环境科技有限公司 | Efficient washing dechlorination process and device for household garbage incineration fly ash |
| CN112403134A (en) * | 2020-12-02 | 2021-02-26 | 中国成达工程有限公司 | System and method for treating sublimate of electrolytic magnesium anode |
| CN114871257A (en) * | 2022-05-23 | 2022-08-09 | 安徽海螺环保集团有限公司 | Pretreatment method and pretreatment equipment for co-processing fly ash |
| CN115301711A (en) * | 2022-08-04 | 2022-11-08 | 江山市虎鼎环保科技有限公司 | Anti-blocking method for washing and filter pressing fly ash |
| CN116212517A (en) * | 2023-01-30 | 2023-06-06 | 广西粤桥新材料科技有限公司 | Separation and drying method and system for synthetic rutile |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106032302A (en) * | 2016-06-16 | 2016-10-19 | 浙江富春江环保热电股份有限公司 | Waste incineration fly ash washing wastewater treatment method |
| CN108043859A (en) * | 2017-12-01 | 2018-05-18 | 中广核研究院有限公司 | A kind of domestic garbage incineration flyash innocuity disposal system and method |
| CN111346421A (en) * | 2020-03-13 | 2020-06-30 | 杭州科源节能技术有限公司 | Continuous washing system for fly ash washing and working method thereof |
| CN111359306A (en) * | 2020-03-13 | 2020-07-03 | 杭州科源节能技术有限公司 | Filter system for washing fly ash and filter method thereof |
| CN111389094A (en) * | 2020-03-13 | 2020-07-10 | 杭州科源节能技术有限公司 | Fly ash washing and filtering system and filtering method thereof |
| CN111589837A (en) * | 2020-04-12 | 2020-08-28 | 北京锐上思环保科技有限公司 | Reinforced desalting method for water washing pretreatment of fly ash |
| CN111774404A (en) * | 2020-07-04 | 2020-10-16 | 上海和惠生态环境科技有限公司 | Efficient washing dechlorination process and device for household garbage incineration fly ash |
| CN112403134A (en) * | 2020-12-02 | 2021-02-26 | 中国成达工程有限公司 | System and method for treating sublimate of electrolytic magnesium anode |
| CN114871257A (en) * | 2022-05-23 | 2022-08-09 | 安徽海螺环保集团有限公司 | Pretreatment method and pretreatment equipment for co-processing fly ash |
| CN115301711A (en) * | 2022-08-04 | 2022-11-08 | 江山市虎鼎环保科技有限公司 | Anti-blocking method for washing and filter pressing fly ash |
| CN116212517A (en) * | 2023-01-30 | 2023-06-06 | 广西粤桥新材料科技有限公司 | Separation and drying method and system for synthetic rutile |
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Application publication date: 20150610 |