CN104355573A - Fly ash comprehensive utilization process method - Google Patents
Fly ash comprehensive utilization process method Download PDFInfo
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- CN104355573A CN104355573A CN201410541415.XA CN201410541415A CN104355573A CN 104355573 A CN104355573 A CN 104355573A CN 201410541415 A CN201410541415 A CN 201410541415A CN 104355573 A CN104355573 A CN 104355573A
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Abstract
The invention discloses a fly ash comprehensive utilization process method. The process method comprises steps as follows: magnetic beads and floating beads with high value are selected firstly, fly ash slurry after the magnetic beads and the floating beads are selected is put in a pregelatinization reaction kettle, lime milk and a little NaOH are added, the mixture is pregelatinized to form pregelatinized slurry with tobermorite as a main component under the pressure of 0.4-0.6 Mpa at the temperature of 110-130 DEG C, and the pregelatinized slurry is filtered and dried to prepare inorganic chemical filler; and the pregelatinized slurry has secondary gelatinization reaction, lime milk is continuously added, secondary gelatinized slurry containing a large quantity of fibrous xonotlite crystals is generated under the pressure of 2-3 Mpa at the temperature is 220-280 DEG C, and the secondary gelatinized slurry is placed in a mold, dehydrated by a pressing machine and molded to prepare a light calcium silicate board product. The process method is simple to operate, low in cost and pollution-free and has high comprehensive economic benefits.
Description
Technical field
The present invention relates to Ash Utilization and utilize technical field, especially a kind of total utilization of PCA processing method.
Background technology
In recent years, China's energy industry stable development, power generation capacity annual growth is 7.3%, developing rapidly of power industry, bring the sharply increase of flyash quantity discharged, annual the discharged flyash total amount of Hazards in Power Plant increases year by year, just reaches about 200,000,000 tons, cause huge pressure to the development of the national economy of China and ecotope to China's flyash quantity discharged in 2010.On the other hand, China is again the limited country of a per capita resource reserve, the comprehensive utilization of flyash, turn waste into wealth, turn bane into boon, to become in China's economic construction an important techno-economic policy, solve China electrical production environmental pollution, the important means of contradiction between resource shortage, be also electrical production one of the task of facing solution.
At present, flyash is mainly used to produce pulverized fuel ash cement, flyash brick, fly ash silicate building block, powder ash air-entrained concrete etc.; Also be in the starting stage for the flyash comprehensive utilizating research that becomes more meticulous.
Summary of the invention
The object of the present invention is to provide a kind of total utilization of PCA processing method, this processing method is simple to operate, and cost is low, pollution-free, and overall economic efficiency is high.
Technical scheme of the present invention is: a kind of total utilization of PCA processing method, it comprises the steps:
1) flyash and water in 1: 3 ~ 4 ratio be mixed into pulverized fuel ash slurry, pulverized fuel ash slurry wet separator is carried out magnetic separation and obtain magnetic-particle slip and de-magnetic pulverized fuel ash slurry, magnetic-particle slip is through to filter and drying obtains magnetic bead product;
2) de-magnetic pulverized fuel ash slurry is sent in air flotation pool, under the stirring of air flotation pool bottom high-pressure air, density is less than 1g/m
3drift pearl fully come out and on bubbling through the water column, fish for drift pearl with mechanical screen cloth, by the drift pearl fished for through to filter and drying obtains floating pearl product;
3) pulverized fuel ash slurry of fishing for out after drift pearl is placed in pregelatinated reactor, add milk of lime and a small amount of NaOH, calcium silicon mole ratio in starting material slip is made to control in 0.79 ~ 0.84: 1 scope, the add-on of NaOH is 0.1 ~ 1.0% of solid substance weight in slurries, be 0.4 ~ 0.6Mpa at pressure, temperature is be uniformly mixed 0.5 ~ 1 hour under the condition of 110 ~ 130 DEG C, and the raw material pregelatinated mixed becomes the pregelatinated slip based on tobermorite.
4) pregelatinated slip is placed in two-step gelation reactor, add milk of lime adjustment silico-calcium ratio, calcium silicon mole ratio in starting material slip is made to control in 0.90 ~ 1.1: 1 scope, be 2 ~ 3Mpa at pressure, temperature is be uniformly mixed 0.5 ~ 1 hour under the condition of 220 ~ 280 DEG C, and the raw material two-step gelationization mixed generates the two-step gelation slurry containing a large amount of fibrous xonotlite crystal.
5) two-step gelation slurry is loaded mould dewater under press and shaping, shaping material block is dried and is obtained light calcium silicate plate product.
As the another kind of technical scheme of the present invention, part or all of pregelatinated slip obtained inorganic chemical industry filler after air stream drying.
Further, described magnetic separation is carried out in two steps, pulverized fuel ash slurry is sent in a magnetic separator through pipeline and is carried out one roughing, roughly select out the higher slip of iron level to enter secondary magnetic separator through Cemented filling and carry out selected, after twice magnetic separation, obtain magnetic-particle slip and de-magnetic pulverized fuel ash slurry, magnetic-particle slip obtains magnetic bead product through filtration and drying;
Advantage of the present invention is:
1) the present invention takes full advantage of fly ash, make land occupation discharge and the flyash of contaminate environment turn waste into wealth, first select being worth higher magnetic bead and floating pearl, remaining heavy pearl makes light calcium silicate plate and/or inorganic chemical industry filler as silicon source material, and economic benefit and social benefit are very remarkable.
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, and in addition, it also can be used as the novel medium solid of coal separation, and has the advantage such as resistance to oxidation, wear-resisting good stability.
3) features such as the drift pearl product that the present invention selects has light weight due to it, heat insulation, and sound insulation is high temperature resistant, wear-resisting, its value is higher, not only can be used as inorganic chemical industry filler, as a kind of carrier, can also make various functional materials as matrix.
4) light calcium silicate plate that obtains of the present invention, the siliceous material such as silica powder and diatomite is instead of with the flyash selected after magnetic bead and drift pearl, reduce material cost on the one hand, on the other hand because flyash contains the feature of a large amount of cenosphere, reduce product density, its apparent density is at 0.20g/m
3~ 0.30g/m
3between, therefore be referred to as light calcium silicate plate.Have employed two-step gelation and be combined to technique, by a large amount of tobermorite crystal seed of pregelatinated inductive formation, secondary gel generates a large amount of fibrous xonotlite crystal, makes product obtain premium properties.
5) the inorganic chemical industry filler that the present invention obtains is snow silico-calcium type Calucium Silicate powder (5CaO6SiO
25H
2o), be a kind of novel inorganic inert filler, good to various types of resins wetting property, easily admix, can thermal conductivity be increased, improve hardness, change glueability, promote flame retardant properties.Be mainly used in the product that silicon rubber, coating, paint, refractory materials and other chemical industry etc. need ultra-fine filling material and industry to manufacture.
6) present invention process is simple, and easy to operate, productive rate is high, environmental protection, and labour intensity is little, and efficiency is high, is beneficial to heavy industrialization.
Embodiment
Below by embodiment, the present invention is described in further detail:
Embodiment 1: a kind of total utilization of PCA processing method, it comprises the steps:
1) flyash and water in 1: 3.3 ratio be mixed into pulverized fuel ash slurry, pulverized fuel ash slurry is sent in a magnetic separator through pipeline and is carried out one roughing, roughly select out the higher slip of iron level to enter secondary magnetic separator through Cemented filling and carry out selected, after twice magnetic separation, obtain magnetic-particle slip and de-magnetic pulverized fuel ash slurry, magnetic-particle slip obtains magnetic bead product through filtration and drying;
2) de-magnetic pulverized fuel ash slurry is sent in air flotation pool, under the stirring of air flotation pool bottom high-pressure air, density is less than 1g/m
3drift pearl fully come out and on bubbling through the water column, fish for drift pearl with mechanical screen cloth, by the drift pearl fished for through to filter and drying obtains floating pearl product;
3) pulverized fuel ash slurry of fishing for out after drift pearl is placed in pregelatinated reactor, add milk of lime and a small amount of NaOH, calcium silicon mole ratio in starting material slip is made to be 0.82: 1, the add-on of NaOH is 0.5% of solid substance weight in slurries, be 0.5Mpa at pressure, temperature is be uniformly mixed 0.8 hour under the condition of 120 DEG C, and the raw material pregelatinated mixed becomes the pregelatinated slip based on tobermorite.
4) pregelatinated slip is placed in two-step gelation reactor, add milk of lime adjustment silico-calcium ratio, calcium silicon mole ratio in starting material slip is made to be 1: 1, be 2.5Mpa at pressure, temperature is be uniformly mixed 0.8 hour under the condition of 260 DEG C, and the raw material two-step gelationization mixed generates the two-step gelation slurry containing a large amount of fibrous xonotlite crystal.
5) two-step gelation slurry is loaded mould dewater under press and shaping, shaping material block is dried and is obtained light calcium silicate plate product.
Embodiment 2: a kind of total utilization of PCA processing method, it comprises the steps:
1) flyash and water in 1: 3 ratio be mixed into pulverized fuel ash slurry, pulverized fuel ash slurry is sent in a magnetic separator through pipeline and is carried out one roughing, roughly select out the higher slip of iron level to enter secondary magnetic separator through Cemented filling and carry out selected, after twice magnetic separation, obtain magnetic-particle slip and de-magnetic pulverized fuel ash slurry, magnetic-particle slip obtains magnetic bead product through filtration and drying;
2) de-magnetic pulverized fuel ash slurry is sent in air flotation pool, under the stirring of air flotation pool bottom high-pressure air, density is less than 1g/m
3drift pearl fully come out and on bubbling through the water column, fish for drift pearl with mechanical screen cloth, by the drift pearl fished for through to filter and drying obtains floating pearl product;
3) pulverized fuel ash slurry of fishing for out after drift pearl is placed in pregelatinated reactor, add milk of lime and a small amount of NaOH, calcium silicon mole ratio in starting material slip is made to be 0.79: 1, the add-on of NaOH is 0.8% of solid substance weight in slurries, be 0.6Mpa at pressure, temperature is be uniformly mixed 0.6 hour under the condition of 130 DEG C, and the raw material pregelatinated mixed becomes the pregelatinated slip based on tobermorite.
4) pregelatinated slip is placed in two-step gelation reactor, add milk of lime adjustment silico-calcium ratio, calcium silicon mole ratio in starting material slip is made to be 0.9: 1, be 2Mpa at pressure, temperature is be uniformly mixed 0.7 hour under the condition of 230 DEG C, and the raw material two-step gelationization mixed generates the two-step gelation slurry containing a large amount of fibrous xonotlite crystal.
5) two-step gelation slurry is loaded mould dewater under press and shaping, shaping material block is dried and is obtained light calcium silicate plate product.
Embodiment 3: a kind of total utilization of PCA processing method, it comprises the steps:
1) flyash and water in 1: 4 ratio be mixed into pulverized fuel ash slurry, pulverized fuel ash slurry is sent in a magnetic separator through pipeline and is carried out one roughing, roughly select out the higher slip of iron level to enter secondary magnetic separator through Cemented filling and carry out selected, after twice magnetic separation, obtain magnetic-particle slip and de-magnetic pulverized fuel ash slurry, magnetic-particle slip obtains magnetic bead product through filtration and drying;
2) de-magnetic pulverized fuel ash slurry is sent in air flotation pool, under the stirring of air flotation pool bottom high-pressure air, density is less than 1g/m
3drift pearl fully come out and on bubbling through the water column, fish for drift pearl with mechanical screen cloth, by the drift pearl fished for through to filter and drying obtains floating pearl product;
3) pulverized fuel ash slurry of fishing for out after drift pearl is placed in pregelatinated reactor, add milk of lime and a small amount of NaOH, calcium silicon mole ratio in starting material slip is made to be 0.84: 1, the add-on of NaOH is 0.3% of solid substance weight in slurries, be 0.4Mpa at pressure, temperature is be uniformly mixed 0.7 hour under the condition of 110 DEG C, and the raw material pregelatinated mixed becomes the pregelatinated slip based on tobermorite.
4) the pregelatinated slip of 1/3 weight obtained inorganic chemical industry filler after air stream drying.
5) the pregelatinated slip of 2/3 weight is placed in two-step gelation reactor, add milk of lime adjustment silico-calcium ratio, calcium silicon mole ratio in starting material slip is made to be 1.1: 1, be 3Mpa at pressure, temperature is be uniformly mixed 0.6 hour under the condition of 280 DEG C, and the raw material two-step gelationization mixed generates the two-step gelation slurry containing a large amount of fibrous xonotlite crystal.
6) two-step gelation slurry is loaded mould dewater under press and shaping, shaping material block is dried and is obtained light calcium silicate plate product.
Claims (3)
1. a total utilization of PCA processing method, it comprises the steps:
1) flyash and water in 1: 3 ~ 4 ratio be mixed into pulverized fuel ash slurry, pulverized fuel ash slurry wet separator is carried out magnetic separation and obtain magnetic-particle slip and de-magnetic pulverized fuel ash slurry, magnetic-particle slip is through to filter and drying obtains magnetic bead product;
2) de-magnetic pulverized fuel ash slurry is sent in air flotation pool, under the stirring of air flotation pool bottom high-pressure air, density is less than 1g/m
3drift pearl fully come out and on bubbling through the water column, fish for drift pearl with mechanical screen cloth, by the drift pearl fished for through to filter and drying obtains floating pearl product;
3) pulverized fuel ash slurry of fishing for out after drift pearl is placed in pregelatinated reactor, add milk of lime and a small amount of NaOH, calcium silicon mole ratio in starting material slip is made to control in 0.79 ~ 0.84: 1 scope, the add-on of NaOH is 0.1 ~ 1.0% of solid substance weight in slurries, be 0.4 ~ 0.6Mpa at pressure, temperature is be uniformly mixed 0.5 ~ 1 hour under the condition of 110 ~ 130 DEG C, and the raw material pregelatinated mixed becomes the pregelatinated slip based on tobermorite.
4) pregelatinated slip is placed in two-step gelation reactor, add milk of lime adjustment silico-calcium ratio, calcium silicon mole ratio in starting material slip is made to control in 0.90 ~ 1.1: 1 scope, be 2 ~ 3Mpa at pressure, temperature is be uniformly mixed 0.5 ~ 1 hour under the condition of 220 ~ 280 DEG C, and the raw material two-step gelationization mixed generates the two-step gelation slurry containing a large amount of fibrous xonotlite crystal.
5) two-step gelation slurry is loaded mould dewater under press and shaping, shaping material block is dried and is obtained light calcium silicate plate product.
2. total utilization of PCA processing method according to claim 1, is characterized in that: part or all of pregelatinated slip obtained inorganic chemical industry filler after air stream drying.
3. total utilization of PCA processing method according to claim 1 and 2, it is characterized in that: described magnetic separation is carried out in two steps, pulverized fuel ash slurry is sent in a magnetic separator through pipeline and is carried out one roughing, roughly select out the higher slip of iron level to enter secondary magnetic separator through Cemented filling and carry out selected, after twice magnetic separation, obtain magnetic-particle slip and de-magnetic pulverized fuel ash slurry, magnetic-particle slip obtains magnetic bead product through filtration and drying.
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Cited By (8)
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| 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 |
| CN106187052A (en) * | 2016-07-27 | 2016-12-07 | 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 adiabator utilizing calcium silicate slag to prepare and preparation method |
| 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 |
| 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 |
| 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 |
| CN114276815A (en) * | 2020-09-27 | 2022-04-05 | 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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| CN101306426A (en) * | 2008-06-20 | 2008-11-19 | 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 |
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Cited By (9)
| 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 |
| CN106187052A (en) * | 2016-07-27 | 2016-12-07 | 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 adiabator utilizing calcium silicate slag to prepare and preparation method |
| 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 |
| 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 |
| 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 |
| 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 |
| CN114276815A (en) * | 2020-09-27 | 2022-04-05 | 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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