CN104198655B - A kind of separation method of CFB Slag mineral - Google Patents
A kind of separation method of CFB Slag mineral Download PDFInfo
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- CN104198655B CN104198655B CN201410412982.5A CN201410412982A CN104198655B CN 104198655 B CN104198655 B CN 104198655B CN 201410412982 A CN201410412982 A CN 201410412982A CN 104198655 B CN104198655 B CN 104198655B
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Abstract
The invention discloses a kind of separation method of CFB Slag mineral, belong to solid wastes recycling and utilize technical field.The present invention utilizes various mineral constituent in CFB Slag, the feature be distributed in variable grain thing because melt temperature, hardness and the extent of reaction etc. are different, physical separation methods is adopted to realize the separation and consentration of end slag mineral constituent, and then realize the cascade utilization of CFB Slag, expand its utilization ways.The separation of the present invention's rich CaO type material, can reduce the energy and consumption of raw materials, increase the benefit; The rich CaSO of the present invention
4the separation of type material, can alleviate boiler circulating load, simplifies the application process of material; The separation of the rich silicate-type material of the present invention, that can improve recirculating fluidized bed bottom slag utilizes field and value.
Description
Technical field
The invention belongs to solid wastes recycling and utilize technical field, be specifically related to a kind of separation method of CFB Slag mineral, be one physical method for separation CFB Slag mineral, improve the method for its value and approach.
Background technology
It is strong that Circulating Fluidized Bed Boiler has coal adaptability, and burning efficiency is high, can realize the advantages such as furnace high-temperature desulfurization, becomes rapidly the preferred of the newly-built thermal power plant of country's encouragement in recent years.China is that circulating fluidized bed boiler of power station number of units is maximum in the world, the country that total installation of generating capacity is maximum.Owing to adopting low calorific value coal burning energy supply, the lime-ash of Circulating Fluidized Bed Boiler discharge accounts for raw coal quality about 50%, and end slag accounts for the 50%-60% of lime-ash discharge.Because temperature of combustion is far below pulverized coal firing boiler in circulating fluidized-bed boiler ash forming process, and in sweetening process, form a large amount of CaSO
4and CaO, cause the characteristic of CFB Slag and coal dust bottom slag to differ greatly, work field cannot be built at building materials and be able to large-scale application.
In document about the application and development of recirculating fluidized bed CFB lime-ash mainly to be directly utilized as master, as: power plant's Circulating Fluidized Bed Boiler mud is mixed and is burnt utilization system (number of patent application 201220416466.6), Solid sulfur ash masonry mortar (number of patent application 201310183792.6), the full solid waste weak concrete material (number of patent application 200810070361.8) utilizing fluidized bed burned-coal fluidized bed combustion coal ash/slag to prepare, circulating fluidized bed combustion ash is utilized to prepare the method (number of patent application 201010237033.X) of special cement, circulating fluidized bed combustion ash is utilized to prepare the method (number of patent application 201010237033) of special cement, the method (number of patent application 201310130688.0) of circulating fluid bed coal ash and bottom ash synthetic zeolite, circulating fluidized bed sulfur fixation ash aerated concrete and preparation method thereof (number of patent application 201010191406.4), a kind of combined wall board panel and production method (number of patent application 201210118724.7) thereof of mixing circulating fluid bed coal ash, a kind of preparation method's (number of patent application 201110405478.9) of efficient sulfur-fixing agent, a kind of cement expansive material (number of patent application 201010264828.x) containing circulating fluidized bed combustion coal solid sulfur clinker, a kind of grouting material (number of patent application 201210155560.5) containing circulating fluidized bed combustion coal solid sulfur ash, a kind of Binder Materials preparation method based on circulating fluid bed bottom slag (number of patent application 201110004103.1), a kind of preparation method's (number of patent application 200910234585.2) of bottom slag-based geopolymer of high-temperature resistant circulating fluid bed, a kind of disposal route (number of patent application 201110041227.7) of Circulating Fluidized Bed Boiler flying dust, a kind of preparation method's (number of patent application 201210072594.8) of circulating fluidized bed combustion coal solid sulfur ash lightweight concrete, a kind of steamed brick and preparation method thereof (number of patent application 201210107212.0), take recirculating fluidized bed bottom slag as the method (number of patent application 201010206366.6) that active aggregates prepares geopolymer mortar.
Research and development feature in comprehensive existing document, can find a large amount of calcium sulphate (CaSO
4) and the existence of calcium oxide (CaO), seriously constrain application and the number of applications of Circulating Fluidized Bed Boiler.
Summary of the invention
The object of the present invention is to provide a kind of separation method of CFB Slag mineral, select slag at the bottom of physical method separating circulating fluidized bed boiler, obtain rich CaSO
4, rich CaO and rich silicate component, overcome existing CFB Slag because of overall CaSO
4with CaO content is high and the deficiency that utilization factor is limited, there is the double effect of environmental protection and economic utilization.
For achieving the above object, the technical scheme that the present invention takes is: a kind of separation method of CFB Slag mineral, and its concrete steps are:
Step 1): choose CFB Slag, the size fraction ranges of selected CFB Slag sorting;
Step 2): cooled CFB Slag is directly sent into screening installation, adopts physical method to carry out sorting;
Step 3): the CaSO of the ring bottom dregs at fluid bed boiler sub-elected
4, CaO and silicate distribution, analytical approach is: with the SO in all kinds of slag
3massfraction calculates and forms CaSO
4amount; Deduct with CaO total amount in corresponding slag and form CaSO
4the CaO amount consumed, gained difference is designated as the amount of free CaO; CaSO is deducted with the total amount of corresponding slag
4with the amount of free CaO, gained difference is designated as the amount of silicate;
Step 4): according to the CaSO in all kinds of slag
4, CaO and silicate content, calculate respectively and account for total CaSO in recirculating fluidized bed bottom slag
4, CaO and silicate ratio;
Step 5): according to mineral composition feature, recirculating fluidized bed bottom slag is divided into rich CaO type, rich CaSO
4type and rich silicate-type material.
Size fraction ranges smallest dimension described in step 1) of the present invention is 45 microns, and out to out is 50 millimeters.
Step 2 of the present invention) described in the physical separation methods of separating cycle CFB bottom ash, it comprises one or more in gravity treatment, electric separation, screening or flotation.
The CFB Slag that the present invention chooses before sorting without any need for pre-service.
The invention has the beneficial effects as follows: by the mineral of physical method sorting and enrichment cycles CFB bottom ash, widened the application category of end slag, again reduce the energy and consumption of raw materials and improve the effect of product.Specifically, there is following characteristics:
(1) the present invention is by analyzing the CaSO of slag of all kinds of ends
4, CaO and silicate distribution, can preferably end slag sorting schemes and application category.
(2) separation of the present invention's rich CaO type material, can reduce the energy and consumption of raw materials, increase the benefit.
(3) the rich CaSO of the present invention
4the separation of type material, can alleviate boiler circulating load, simplifies the application process of material.
(4) separation of the rich silicate-type material of the present invention, that can improve recirculating fluidized bed bottom slag utilizes field and value.
(5) separation method of CFB Slag mineral of the present invention, can provide easy for the recycling of CFB Slag, embodiment effectively.
Embodiment
Below the embodiment of CFB Slag minerals separation method of the present invention is elaborated.
Of the present inventionly to be contemplated that: utilize various mineral constituent in CFB Slag, the feature be distributed in variable grain thing because melt temperature, hardness and the extent of reaction etc. are different, physical separation methods is adopted to realize the separation and consentration of end slag mineral constituent, and then realize the cascade utilization of CFB Slag, expand its utilization ways.
The separation method of a kind of CFB Slag mineral of the present invention, processing step is:
1, choose CFB Slag, end slag is without any need for pre-service before sorting, and the size fraction ranges of selected end slag sorting, the smallest dimension of size fraction ranges is 45 microns, and out to out is 50 millimeters.
2, cooled CFB Slag is directly sent into screening installation, adopt physical method to carry out sorting, adoptable physical method comprises gravity treatment, electric separation, screening or flotation, can be used alone, also can multiple coupling.
The CaSO of the ring bottom dregs at fluid bed boiler 3, sub-elected
4, CaO and silicate distribution, analytical approach is: with the SO in all kinds of slag
3massfraction calculates and forms CaSO
4amount; Deduct with CaO total amount in corresponding slag and form CaSO
4the CaO amount consumed, gained difference is designated as the amount of free CaO; CaSO is deducted with the total amount of corresponding slag
4with the amount of free CaO, gained difference is designated as the amount of silicate.
4, according to the CaSO in all kinds of slag
4, CaO and silicate content, calculate respectively and account for total CaSO in recirculating fluidized bed bottom slag
4, CaO and silicate ratio.
5, according to mineral composition feature, recirculating fluidized bed bottom slag is divided into rich CaO type, rich CaSO
4type and rich silicate-type material.
Embodiment 1
Select circulating bottom dregs at fluid bed boiler, adopt 45 microns be grade scale with 50 millimeters, carry out the gravity treatment of 3 kinds of grades, the absolute value formed with each stage material after sorting, can realize that calcium oxide (CaO) content reaches 50%, calcium sulphate (CaSO
4) content reach 60% and silicate content reach 80% all types of enrichment materials.
Embodiment 2
Select circulating bottom dregs at fluid bed boiler, adopting 10 millimeters is grade scale, carries out screening or the electric separation of 2 kinds of grades, with the absolute value of each stage material composition after sorting, can realize that calcium oxide (CaO) content reaches 45%, calcium sulphate (CaSO
4) content 40% and silicate content reach 85% all types of enrichment materials.
Embodiment 3
Select circulating bottom dregs at fluid bed boiler, adopting 75 microns, 102 microns, 20 millimeters is grade scale, carry out the gravity treatment of 4 kinds of grades and flotation combined, with the absolute value of stage material composition each after sorting, can realize that calcium oxide (CaO) content reaches 60%, calcium sulphate (CaSO
4) content reach 66% and silicate content reach 95% all types of enrichment materials.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (3)
1. a separation method for CFB Slag mineral, is characterized in that, concrete steps are:
Step 1): choose CFB Slag, the size fraction ranges of selected CFB Slag sorting;
Step 2): cooled CFB Slag is directly sent into screening installation, adopts physical method to carry out sorting;
Step 3): the CaSO of the ring bottom dregs at fluid bed boiler sub-elected
4, CaO and silicate distribution, analytical approach is: with the SO in all kinds of slag
3massfraction calculates and forms CaSO
4amount; Deduct with CaO total amount in corresponding slag and form CaSO
4the CaO amount consumed, gained difference is designated as the amount of free CaO; CaSO is deducted with the total amount of corresponding slag
4with the amount of free CaO, gained difference is designated as the amount of silicate;
Step 4): according to the CaSO in all kinds of slag
4, CaO and silicate content, calculate respectively and account for total CaSO in recirculating fluidized bed bottom slag
4, CaO and silicate ratio;
Step 5): according to mineral composition feature, recirculating fluidized bed bottom slag is divided into rich CaO type, rich CaSO
4type and rich silicate-type material;
Wherein, the size fraction ranges described in step 1), its smallest dimension is 45 microns, and out to out is 50 millimeters.
2. the separation method of a kind of CFB Slag mineral according to claim 1, it is characterized in that: step 2) described in the physical separation methods of separating cycle CFB bottom ash, it comprises one or more in gravity treatment, electric separation, screening or flotation.
3. the separation method of a kind of CFB Slag mineral according to claim 1, is characterized in that: CFB Slag before sorting without any need for pre-service.
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| CN201410412982.5A CN104198655B (en) | 2014-08-21 | 2014-08-21 | A kind of separation method of CFB Slag mineral |
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| CN201410412982.5A CN104198655B (en) | 2014-08-21 | 2014-08-21 | A kind of separation method of CFB Slag mineral |
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| CN104198655B true CN104198655B (en) | 2016-01-13 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114716173B (en) * | 2022-04-26 | 2023-08-15 | 武汉理工大学 | A method for resource utilization of circulating fluidized bed slag |
| CN114804736B (en) * | 2022-04-28 | 2023-09-26 | 武汉武新新型建材股份有限公司 | Geopolymer utilizing household garbage incineration fly ash and bottom ash and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202943017U (en) * | 2012-09-01 | 2013-05-22 | 山西平朔煤矸石发电有限责任公司 | Circulating fluidized bed slag sorting device |
| CN103406329A (en) * | 2013-07-05 | 2013-11-27 | 广东环兴环保节能科技有限公司 | Method for comprehensively treating and utilizing household garbage incineration slag |
| CN203744245U (en) * | 2014-03-25 | 2014-07-30 | 清华大学 | Deslagging device of circulating fluidized bed boiler |
-
2014
- 2014-08-21 CN CN201410412982.5A patent/CN104198655B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202943017U (en) * | 2012-09-01 | 2013-05-22 | 山西平朔煤矸石发电有限责任公司 | Circulating fluidized bed slag sorting device |
| CN103406329A (en) * | 2013-07-05 | 2013-11-27 | 广东环兴环保节能科技有限公司 | Method for comprehensively treating and utilizing household garbage incineration slag |
| CN203744245U (en) * | 2014-03-25 | 2014-07-30 | 清华大学 | Deslagging device of circulating fluidized bed boiler |
Non-Patent Citations (1)
| Title |
|---|
| 流化床(FBC)燃煤固硫灰渣研究综述;纪宪坤等;《粉煤灰》;20091225(第6期);第41－45页 * |
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