CN104355573B - Total utilization of PCA process - Google Patents
Total utilization of PCA process Download PDFInfo
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- CN104355573B CN104355573B CN201410541415.XA CN201410541415A CN104355573B CN 104355573 B CN104355573 B CN 104355573B CN 201410541415 A CN201410541415 A CN 201410541415A CN 104355573 B CN104355573 B CN 104355573B
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- slip
- pregelatinated
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Abstract
The invention discloses a kind of total utilization of PCA process, it is first to select costly magnetic bead and floating bead, then the pulverized fuel ash slurry after selecting magnetic bead and floating bead is placed in pregelatinated reactor, add lime cream and a small amount of NaOH, it is 0.4～0.6Mpa at pressure, under conditions of temperature is 110～130 DEG C, pregelatinated becomes the pregelatinated slip based on tobermorite, and its filtration drying can be prepared inorganic chemical industry filler；Pregelatinated slip is carried out two-step gelation reaction, continue to add lime cream, it is 2～3Mpa at pressure, under conditions of temperature is 220～280 DEG C, metaplasia becomes the two-step gelation slurrying material containing a large amount of threadiness eakleite crystal, is loaded into mould and is dehydrated under press and molding prepares light calcium silicate plate product.This process is simple to operate, and low cost is pollution-free, and overall economic efficiency is high.
Description
Technical field
The present invention relates to Ash Utilization and utilize technical field, especially a kind of total utilization of PCA technique
Method.
Background technology
In recent years, China's energy industry stable development, generating capacity annual rate of growth is 7.3%, power industry
Develop rapidly, bring sharply increasing of flyash discharge capacity, the flyash that Hazards in Power Plant is discharged every year
Total amount increases year by year, has just reached about 200,000,000 tons, to the state of China to China's flyash discharge capacity in 2010
People's economic construction and ecological environment cause huge pressure.On the other hand, China is again a per capita money
The country that source reserves are limited, the comprehensive utilization of flyash, turn waste into wealth, turn bane into boon, it has also become China's warp
An important techno-economic policy in Ji construction, is to solve China's power generation environmental pollution, resource shortage
Between the important means of contradiction, be also one of the task of the faced solution of power generation.
At present, flyash be mainly used to produce pulverized fuel ash cement, flyash brick, fly ash silicate building block,
Powder ash air-entrained concrete etc.；Comprehensive utilizating research is become more meticulous also in the starting stage for flyash.
Summary of the invention
It is an object of the invention to provide a kind of total utilization of PCA process, the operation letter of this process
Single, low cost, pollution-free, overall economic efficiency is high.
The technical scheme is that a kind of total utilization of PCA process, it comprises the steps:
1) flyash and water are mixed into pulverized fuel ash slurry by the part by weight of 1: 3～4, by flyash
Serosity wet separator carries out magnetic separation and obtains magnetic-particle slip and de-magnetic pulverized fuel ash slurry, magnetic-particle material
Slurry is through filtering and being dried to obtain magnetic bead product；
2) de-magnetic pulverized fuel ash slurry is sent in flotation tank, under the agitation of flotation tank bottom high-pressure air,
Density is less than 1g/cm3Floating bead fully come out and bubble through the water column on, with machinery screen cloth fish for floating bead, will
The floating bead fished for is through filtering and being dried to obtain floating bead product；
3) pulverized fuel ash slurry after fishing for out floating bead is placed in pregelatinated reactor, add lime cream and
A small amount of NaOH, makes calcium silicon mole ratio in raw material slip control in the range of 0.79～0.84: 1, NaOH
Addition is solid content weight in serosity 0.1～1.0%, be 0.4～0.6Mpa at pressure, temperature is
Stirring mixing 0.5～1 hour, the raw material pregelatinated Cheng Yixue silico-calcium of mix homogeneously under conditions of 110～130 DEG C
The pregelatinated slip of Shi Weizhu；
4) pregelatinated slip is placed in two-step gelation reactor, adds lime cream and adjust silico-calcium ratio,
Make calcium silicon mole ratio in raw material slip control in the range of 0.90～1.1: 1, be 2～3Mpa at pressure,
Under conditions of temperature is 220～280 DEG C, stirring mixes 0.5～1 hour, the raw material two-step gelation of mix homogeneously
Generate the two-step gelation slurrying material containing a large amount of threadiness eakleite crystal；
5) two-step gelation slurrying material being loaded mould to be dehydrated under press and molding, the material block of molding dries system
Obtain light calcium silicate plate product.
As another kind technical scheme of the present invention, part or all of pregelatinated slip is prepared after pneumatic conveying drying
Inorganic chemical industry filler.
Further, described magnetic separation is undertaken in two steps, and pulverized fuel ash slurry enters in a magnetic separator sent into by pipeline
Row one roughing, roughly selects out the higher slip of iron content and is conveyed into secondary magnetic separator through pipeline and carries out selected, warp
Obtaining magnetic-particle slip and de-magnetic pulverized fuel ash slurry after crossing twice magnetic separation, magnetic-particle slip is through filtering
Be dried to obtain magnetic bead product.
Advantages of the present invention is:
1) present invention takes full advantage of fly ash so that land occupation discharges and pollutes the powder of environment
Coal ash is turned waste into wealth, and first the higher magnetic bead of value and floating bead is selected, and remaining heavy pearl is as silicon source material
Make light calcium silicate plate and/or inorganic chemical industry filler, economic benefit and social benefit are the most notable.
2) the magnetic bead product iron oxide content that the present invention selects is about 50%, is the iron-smelting raw material of high-quality, separately
Outward, it is alternatively arranged as the novel medium solid of coal separation, and has the advantage such as resistance to oxidation, wear-resisting good stability.
3) the floating bead product that the present invention selects has light weight due to it, heat insulation, and sound insulation is high temperature resistant, wear-resisting spy such as grade
Levying, its value is higher, serves not only as inorganic chemical industry filler, it is also possible to as a kind of carrier, as substrate
Make various functional material.
4) light calcium silicate plate that the present invention prepares, the flyash after selecting magnetic bead and floating bead instead of
The siliceous material such as silica flour and kieselguhr, on the one hand reduces the cost of raw material, on the other hand due to flyash
Containing the feature of a large amount of cenospheres, reducing product density, its apparent density is at 0.20g/cm3~
0.30g/cm3Between, therefore referred to as light calcium silicate plate.Have employed two-step gelation and be combined to technique, pass through
Pregelatinated inductive formation a large amount of tobermorite crystal seed, secondary gel generates a large amount of threadiness eakleite crystal,
Product is made to obtain premium properties.
5) the inorganic chemical industry filler that the present invention prepares is snow silico-calcium type calcium silicates (5CaO 6SiO2·5H2O), for
A kind of novel inorganic inert filler, good to various types of resins wellability, easily admix, heat conductivity can be increased, carry
High rigidity, changes glueability, promotes fire resistance.It is mainly used in silicone rubber, coating, paint, fire-resistant
Material and other chemical industry etc. need the product that ultra-fine filling material and industry manufacture.
6) present invention process is simple, easy to operate, and productivity is high, and environmental protection, labor intensity is little, efficiency
Height, beneficially heavy industrialization.
Detailed description of the invention
Below by embodiment, the present invention is described in further detail:
Embodiment 1: a kind of total utilization of PCA process, it comprises the steps:
1) flyash and water are mixed into pulverized fuel ash slurry, pulverized fuel ash slurry by the part by weight of 1: 3.3
In a magnetic separator sent into by pipeline, carry out one roughing, roughly select out the higher slip of iron content and carry through pipeline
Enter secondary magnetic separator and carry out selected, after twice magnetic separation, obtain magnetic-particle slip and de-magnetic powder coal ash paste
Liquid, magnetic-particle slip is through filtering and being dried to obtain magnetic bead product；
2) de-magnetic pulverized fuel ash slurry is sent in flotation tank, under the agitation of flotation tank bottom high-pressure air,
Density is less than 1g/cm3Floating bead fully come out and bubble through the water column on, with machinery screen cloth fish for floating bead, will
The floating bead fished for is through filtering and being dried to obtain floating bead product；
3) pulverized fuel ash slurry after fishing for out floating bead is placed in pregelatinated reactor, add lime cream and
A small amount of NaOH, making calcium silicon mole ratio in raw material slip is 0.82: 1, and the addition of NaOH is in serosity
The 0.5% of solid content weight, is 0.5Mpa at pressure, and under conditions of temperature is 120 DEG C, stirring mixes 0.8 hour,
The raw material pregelatinated of mix homogeneously becomes the pregelatinated slip based on tobermorite；
4) pregelatinated slip is placed in two-step gelation reactor, adds lime cream and adjust silico-calcium ratio,
Making calcium silicon mole ratio in raw material slip is 1: 1, is 2.5Mpa at pressure, and temperature is the condition of 260 DEG C
Lower stirring mixing 0.8 hour, the raw material two-step gelation metaplasia of mix homogeneously becomes containing the hard silico-calcium of a large amount of threadinesss
The two-step gelation slurrying material of stone crystal；
5) two-step gelation slurrying material being loaded mould to be dehydrated under press and molding, the material block of molding dries system
Obtain light calcium silicate plate product.
Embodiment 2: a kind of total utilization of PCA process, it comprises the steps:
1) flyash and water are mixed into pulverized fuel ash slurry, pulverized fuel ash slurry warp by the part by weight of 1: 3
Pipeline carries out one roughing in sending into a magnetic separator, and the slip roughly selecting out iron content higher is conveyed into through pipeline
Secondary magnetic separator carries out selected, obtains magnetic-particle slip and de-magnetic powder coal ash paste after twice magnetic separation
Liquid, magnetic-particle slip is through filtering and being dried to obtain magnetic bead product；
2) de-magnetic pulverized fuel ash slurry is sent in flotation tank, under the agitation of flotation tank bottom high-pressure air,
Density is less than 1g/cm3Floating bead fully come out and bubble through the water column on, with machinery screen cloth fish for floating bead, will
The floating bead fished for is through filtering and being dried to obtain floating bead product；
3) pulverized fuel ash slurry after fishing for out floating bead is placed in pregelatinated reactor, add lime cream and
A small amount of NaOH, making calcium silicon mole ratio in raw material slip is 0.79: 1, and the addition of NaOH is in serosity
The 0.8% of solid content weight, is 0.6Mpa at pressure, and under conditions of temperature is 130 DEG C, stirring mixes 0.6 hour,
The raw material pregelatinated of mix homogeneously becomes the pregelatinated slip based on tobermorite；
4) pregelatinated slip is placed in two-step gelation reactor, adds lime cream and adjust silico-calcium ratio,
Making calcium silicon mole ratio in raw material slip is 0.9: 1, is 2Mpa at pressure, and temperature is the condition of 230 DEG C
Lower stirring mixing 0.7 hour, the raw material two-step gelation metaplasia of mix homogeneously becomes containing the hard silico-calcium of a large amount of threadinesss
The two-step gelation slurrying material of stone crystal；
5) two-step gelation slurrying material being loaded mould to be dehydrated under press and molding, the material block of molding dries system
Obtain light calcium silicate plate product.
Embodiment 3: a kind of total utilization of PCA process, it comprises the steps:
1) flyash and water are mixed into pulverized fuel ash slurry, pulverized fuel ash slurry warp by the part by weight of 1: 4
Pipeline carries out one roughing in sending into a magnetic separator, and the slip roughly selecting out iron content higher is conveyed into through pipeline
Secondary magnetic separator carries out selected, obtains magnetic-particle slip and de-magnetic powder coal ash paste after twice magnetic separation
Liquid, magnetic-particle slip is through filtering and being dried to obtain magnetic bead product；
2) de-magnetic pulverized fuel ash slurry is sent in flotation tank, under the agitation of flotation tank bottom high-pressure air,
Density is less than 1g/cm3Floating bead fully come out and bubble through the water column on, with machinery screen cloth fish for floating bead, will
The floating bead fished for is through filtering and being dried to obtain floating bead product；
3) pulverized fuel ash slurry after fishing for out floating bead is placed in pregelatinated reactor, add lime cream and
A small amount of NaOH, making calcium silicon mole ratio in raw material slip is 0.84: 1, and the addition of NaOH is in serosity
The 0.3% of solid content weight, is 0.4Mpa at pressure, and under conditions of temperature is 110 DEG C, stirring mixes 0.7 hour,
The raw material pregelatinated of mix homogeneously becomes the pregelatinated slip based on tobermorite；
4) the pregelatinated slip of 1/3 weight is prepared inorganic chemical industry filler after pneumatic conveying drying；
5) the pregelatinated slip of 2/3 weight is placed in two-step gelation reactor, adds lime cream and adjust silicon
Ca proportion, making calcium silicon mole ratio in raw material slip is 1.1: 1, is 3Mpa at pressure, and temperature is 280
Stirring mixing 0.6 hour under conditions of DEG C, the raw material two-step gelation metaplasia of mix homogeneously becomes containing a large amount of fibers
The two-step gelation slurrying material of shape eakleite crystal.
6) two-step gelation slurrying material being loaded mould to be dehydrated under press and molding, the material block of molding dries system
Obtain light calcium silicate plate product.
Claims (3)
1. a total utilization of PCA process, it comprises the steps:
1) flyash and water are mixed into pulverized fuel ash slurry by the part by weight of 1: 3～4, by flyash
Serosity wet separator carries out magnetic separation and obtains magnetic-particle slip and de-magnetic pulverized fuel ash slurry, magnetic-particle material
Slurry is through filtering and being dried to obtain magnetic bead product；
2) de-magnetic pulverized fuel ash slurry is sent in flotation tank, under the agitation of flotation tank bottom high-pressure air,
Density is less than 1g/cm3Floating bead fully come out and bubble through the water column on, with machinery screen cloth fish for floating bead, will
The floating bead fished for is through filtering and being dried to obtain floating bead product；
3) pulverized fuel ash slurry after fishing for out floating bead is placed in pregelatinated reactor, add lime cream and
A small amount of NaOH, makes calcium silicon mole ratio in raw material slip control in the range of 0.79～0.84: 1, NaOH
Addition is solid content weight in serosity 0.1～1.0%, be 0.4～0.6Mpa at pressure, temperature is
Stirring mixing 0.5～1 hour, the raw material pregelatinated Cheng Yixue silico-calcium of mix homogeneously under conditions of 110～130 DEG C
The pregelatinated slip of Shi Weizhu；
4) pregelatinated slip is placed in two-step gelation reactor, adds lime cream and adjust silico-calcium ratio,
Make calcium silicon mole ratio in raw material slip control in the range of 0.90～1.1: 1, be 2～3Mpa at pressure,
Under conditions of temperature is 220～280 DEG C, stirring mixes 0.5～1 hour, the raw material two-step gelation of mix homogeneously
Generate the two-step gelation slurrying material containing a large amount of threadiness eakleite crystal；
5) two-step gelation slurrying material being loaded mould to be dehydrated under press and molding, the material block of molding dries system
Obtain light calcium silicate plate product.
Total utilization of PCA process the most according to claim 1, it is characterised in that: portion
Divide or all pregelatinated slip prepares inorganic chemical industry filler after pneumatic conveying drying.
Total utilization of PCA process the most according to claim 1 and 2, it is characterised in that: institute
The magnetic separation stated is undertaken in two steps, and pulverized fuel ash slurry carries out one roughing, slightly in a magnetic separator sent into by pipeline
Select the higher slip of iron content to be conveyed into secondary magnetic separator through pipeline and carry out selected, after twice magnetic separation
Obtaining magnetic-particle slip and de-magnetic pulverized fuel ash slurry, magnetic-particle slip is through filtering and being dried to obtain magnetic bead
Product.
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| CN201410541415.XA CN104355573B (en) | 2014-09-30 | 2014-09-30 | Total utilization of PCA process |
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| CN201410541415.XA CN104355573B (en) | 2014-09-30 | 2014-09-30 | Total utilization of PCA process |
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| CN104355573B true CN104355573B (en) | 2016-08-24 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104909379A (en) * | 2015-06-12 | 2015-09-16 | 赤峰金辉科技有限公司 | Method for preparing tobermorite |
| CN104926248A (en) * | 2015-06-12 | 2015-09-23 | 赤峰金辉科技有限公司 | Method for producing light calcium silicate boards through high-silicon coal ash |
| CN105689112A (en) * | 2016-03-16 | 2016-06-22 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Method for magnetically separating iron ore concentrate from coal ash |
| CN106187052B (en) * | 2016-07-27 | 2018-07-13 | 大唐国际发电股份有限公司高铝煤炭资源开发利用研发中心 | A kind of tobermorite type heat-insulating material and preparation method using calcium silicate slag preparation |
| CN106517223A (en) * | 2016-10-27 | 2017-03-22 | 辽宁工程技术大学 | Microwave-assisted method for compounding gangue and acetylene sludge into xonotlite fiber |
| CN106495172A (en) * | 2016-10-27 | 2017-03-15 | 辽宁工程技术大学 | The method that xonotlite fiber is produced using sour solution-off aluminium powder coal ash and carbide slag |
| CN109704703A (en) * | 2019-03-07 | 2019-05-03 | 云南建丰建筑工程有限公司 | A kind of light-high-strength calcium silicate board and its preparation process |
| CN114276815B (en) * | 2020-09-27 | 2022-11-29 | 中国科学院过程工程研究所 | Preparation method of modified fly ash, modified fly ash prepared by preparation method and application of modified fly ash |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101306426B (en) * | 2008-06-20 | 2011-10-05 | 北京世纪地和科技有限公司 | Method for extracting iron washed ore from fly ash or slag |
| CN102530966A (en) * | 2011-12-15 | 2012-07-04 | 邹建明 | Method for recycling coal ashes in power plant |
| CN103303952B (en) * | 2012-03-06 | 2015-07-01 | 中国科学院过程工程研究所 | Method for linked preparation of sodium aluminate and production of silica-based material by means of high-alumina fly ash low-temperature liquid-phase alkali dissolving |
| CN102826776B (en) * | 2012-08-02 | 2014-07-09 | 亿利资源集团有限公司 | Method for simultaneously extracting glass microbeads from fly ash and coproducing aluminum-silicon-iron alloy and white carbon black |
| CN103553501B (en) * | 2013-11-05 | 2016-03-02 | 大唐国际发电股份有限公司高铝煤炭资源开发利用研发中心 | The preparation method of calcium-silicate thermal insulation material |
| CN103708478B (en) * | 2013-12-30 | 2015-11-25 | 大唐国际发电股份有限公司高铝煤炭资源开发利用研发中心 | A kind of preparation method of tobermorite |
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