CN101591197A - A kind of method of utilizing pre-desiliconizing with high alumina fly ash to prepare calcium silicate fertilizer - Google Patents
A kind of method of utilizing pre-desiliconizing with high alumina fly ash to prepare calcium silicate fertilizer Download PDFInfo
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- CN101591197A CN101591197A CNA2008101126209A CN200810112620A CN101591197A CN 101591197 A CN101591197 A CN 101591197A CN A2008101126209 A CNA2008101126209 A CN A2008101126209A CN 200810112620 A CN200810112620 A CN 200810112620A CN 101591197 A CN101591197 A CN 101591197A
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Abstract
A kind of method of utilizing pre-desiliconizing with high alumina fly ash to prepare calcium silicate fertilizer relates to environmental mineral and material, chemical technology field.Step of the present invention is: 1. the raw material aluminous fly-ash is added in the sodium hydroxide solution and carry out the molten reaction of alkali; 2. the sodium silicate solution that molten reaction generates to alkali carries out filtering separation, and filter cake desiliconization flyash is as the batching of extracting aluminum oxide; 3. add milk of lime precipitin reaction and filtering separation in the sodium silicate solution after filtering separation, filter cake is a Calucium Silicate powder, and filtrate is sodium hydroxide solution, and sodium hydroxide solution returns step and 1. recycles; 4. the filter cake Calucium Silicate powder is carried out drying, levigate, make the calcium silicate fertilizer product.The present invention utilizes aluminous fly-ash and alkali reaction, and the amorphous silicon di-oxide in the stripping flyash is used for preparing calcium silicate fertilizer, and it is simple to have technology, and material consumption is little, and energy consumption is little, the characteristics that cost is low.
Description
Technical field
The present invention relates to environmental mineral and material, chemical technology field, particularly utilize pre-desiliconizing with high alumina fly ash to prepare the method for calcium silicate fertilizer.
Background technology
Silicon is the essential nutritive ingredient of plant-growth.Dioxide-containing silica is a fine raw material of producing siliceous fertilizer about 37～65% in the flyash.Available silicon content in the siliceous fertilizer (in SiO2) requires 〉=20%, but active silica has only 1～2% in the flyash, become siliceous fertilizer, its soluble silicon content must be improved 15～20 times.It is many that China utilizes the research of flyash production siliceous fertilizer at present.Siliceous fertilizer mainly contains solubility in citric acid siliceous fertilizer and water-soluble siliceous fertilizer.Solubility in citric acid siliceous fertilizer main component is a Calucium Silicate powder, and water-soluble siliceous fertilizer main component is a Starso.
In the prior art, the production that utilizes fine coal to prepare grey calcium silicate fertilizer has two kinds of methods: a kind of is coal dust and limestone powder multifuel combustion in burner hearth, obtains calcium-enforced slag and calcium enriched cyclone-furnace slag; Another kind is that flyash and unslaked lime mix by a certain percentage, roasting under high temperature and specified conditions, and silicon-dioxide in the flyash and calcium oxide generation solid state reaction generate citric soluble calcium silicate fertilizer.Above method exists that calcination time is long, calcining temperature is high, energy consumption height, cost problem of higher.The patent No. is the Chinese patent " a kind of production method of siliceous fertilizer " of ZL200310105447.7, is to be the water-soluble siliceous fertilizer of raw material production with coal gangue or flyash and black liquid.The energy that utilizes black liquid to accumulate under the condition that catalyzer exists, with flyash activating, is made efficient siliceous fertilizer under 600～800 degree temperature condition.This method consumption black liquid amount is bigger, and 1t flyash or coal gangue will consume black liquid 1～40t, obtain 1～3t siliceous fertilizer, the problem that the existence consumption is big, energy consumption is big, cost is high.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the purpose of this invention is to provide a kind of method of utilizing pre-desiliconizing with high alumina fly ash to prepare calcium silicate fertilizer.It is to utilize aluminous fly-ash and alkali reaction, and the amorphous silicon di-oxide in the stripping flyash is used for preparing calcium silicate fertilizer, and it is simple to have technology, and material consumption is little, and energy consumption is little, the characteristics that cost is low.
In order to realize the foregoing invention purpose, technical scheme of the present invention realizes as follows:
A kind of method of utilizing pre-desiliconizing with high alumina fly ash to prepare calcium silicate fertilizer the steps include:
1. the raw material aluminous fly-ash is added in the sodium hydroxide solution and carry out the molten reaction of alkali;
2. the sodium silicate solution that molten reaction generates to alkali carries out filtering separation, and filter cake desiliconization flyash is as the batching of extracting aluminum oxide;
3. add milk of lime precipitin reaction and filtering separation in the sodium silicate solution after filtering separation, filter cake is a Calucium Silicate powder, and filtrate is sodium hydroxide solution, and sodium hydroxide solution returns step and 1. recycles;
4. the filter cake Calucium Silicate powder is carried out drying, levigate, make the calcium silicate fertilizer product.
In the above-mentioned method for preparing calcium silicate fertilizer, Al in the described aluminous fly-ash
2O
3Content 〉=40%, SiO
2Content 〉=35%, the concentration of sodium hydroxide solution is 12 ~ 20%, the mass ratio of aluminous fly-ash and sodium hydroxide is 1: 0.4～0.5.
In the above-mentioned method for preparing calcium silicate fertilizer, the temperature of the molten reaction of described aluminous fly-ash alkali is 110～140 ℃, and the reaction times is 1.5～2.5 hours, and continues to stir.
In the above-mentioned method for preparing calcium silicate fertilizer, the add-on of milk of lime CaO/SiO in molar ratio in the described sodium silicate solution
2=1 ~ 2.
In the above-mentioned method for preparing calcium silicate fertilizer, the temperature of reaction of described preparation Calucium Silicate powder is 20 ~ 90 ℃, and the reaction times is 20 ~ 60min, and continues to stir.
In the above-mentioned method for preparing calcium silicate fertilizer, described Calucium Silicate powder when levigate, is mixed the additive that weight is Calucium Silicate powder 0 ~ 30% in Calucium Silicate powder.Additive is magnesium oxide, ferric oxide, manganese oxide, phosphorus oxide Chemicals or waste residue blast furnace slag, copper smelter slag, ferromanganese slag, the yellow phosphorus furnace slag that contains above oxide compound, and additive can mix separately, also can multiple mixing mix.
Compared with the prior art, the invention has the advantages that:
(1) technology is simple, and temperature of reaction belongs to atmospheric low-temperature, cuts down the consumption of energy greatly.
(2) after the desiliconization liquid filtering separation, have certain temperature, can directly add the milk of lime reaction, do not need to take the heating measure, reduce energy consumption.
(3) raw material is mainly solid waste coal ash and industrial residue, and sodium hydroxide can be recycled, and reduces production costs greatly;
(4) the flyash alumina silica ratio of alkali after molten improves greatly, can be used as the extraction alumina raw material, realizes the high-quality utilization of refuse.
The invention will be further described below in conjunction with the drawings and specific embodiments.
Description of drawings
Accompanying drawing is technological process of production figure of the present invention.
Embodiment
Referring to accompanying drawing, the embodiment of the invention one:
1. select for use and contain Al
2O
348.5%, SiO
237.8% aluminous fly-ash is a raw material, and in the NaOH solution adding reactor with aluminous fly-ash and 20%, the mass ratio of sodium hydroxide and flyash is 0.5: 1.Amorphous carbon/silicon dioxide in the aluminous fly-ash and NaOH solution are to carry out the molten reaction of alkali under 120 ℃ the condition at temperature of reaction kettle, and the reaction times is 2.5 hours.Continuously stirring in the reaction process prevents the excessive and phenomenon of condensing of the sodium silicate solution partial concn that generates.
2. discharging from reactor, filtration and 90 ℃ of hot washes obtain the filtrate sodium silicate solution, and filter cake desiliconization ash is used to extract aluminum oxide.
3. add the milk of lime for preparing in filtrate, the amount of unslaked lime is pressed CaO/SiO in the milk of lime
2=1.Continue to stir, reaction 30min after-filtration separates, and filtrate NaOH solution turns back to operation and 1. prepares burden.
4. filter cake washing, and dry down at 120 ℃.Be 100 order fine powders with the pulverizer mill then, make calcium silicate fertilizer, wherein effective SiO
2Content is greater than 25%, and CaO content is greater than 30%.
The embodiment of the invention two:
Preparation Calucium Silicate powder step is identical with embodiment 1, only is to add 30% water-quenched blast-furnace slag at dried Calucium Silicate powder, and one to reinstate the pulverizer mill be 100 order fine powders, makes calcium silicate fertilizer, wherein effective SiO
2Content is greater than 25%, and CaO+MgO content is greater than 35%.
Claims (6)
1, a kind of method of utilizing pre-desiliconizing with high alumina fly ash to prepare calcium silicate fertilizer the steps include:
1. the raw material aluminous fly-ash is added in the sodium hydroxide solution and carry out the molten reaction of alkali;
2. the sodium silicate solution that molten reaction generates to alkali carries out filtering separation, and filter cake desiliconization flyash is as the batching of extracting aluminum oxide;
3. add milk of lime precipitin reaction and filtering separation in the sodium silicate solution after filtering separation, filter cake is a Calucium Silicate powder, and filtrate is sodium hydroxide solution, and sodium hydroxide solution returns step and 1. recycles;
4. the filter cake Calucium Silicate powder is carried out drying, levigate, make the calcium silicate fertilizer product.
2, according to the described method of utilizing pre-desiliconizing with high alumina fly ash to prepare calcium silicate fertilizer of claim 1, it is characterized in that Al in the described aluminous fly-ash
2O
3Content 〉=40%, SiO
2Content 〉=35%, the concentration of sodium hydroxide solution is 12～20%, the mass ratio of aluminous fly-ash and sodium hydroxide is 1: 0.4～0.5.
3, according to claim 1 or the 2 described methods of utilizing pre-desiliconizing with high alumina fly ash to prepare calcium silicate fertilizer, it is characterized in that the temperature of the molten reaction of described aluminous fly-ash alkali is 110～140 ℃, the reaction times is 1.5～2.5 hours, and continues to stir.
4, according to the described method of utilizing pre-desiliconizing with high alumina fly ash to prepare calcium silicate fertilizer of claim 3, it is characterized in that the add-on of milk of lime CaO/SiO in molar ratio in the described sodium silicate solution
2=1～2.
According to claim 4 or the described method of utilizing pre-desiliconizing with high alumina fly ash to prepare calcium silicate fertilizer, it is characterized in that 5, the temperature of reaction of described preparation Calucium Silicate powder is 20～90 ℃, the reaction times is 20～60min, and continues to stir.
6, according to the described method of utilizing pre-desiliconizing with high alumina fly ash to prepare calcium silicate fertilizer of claim 5, it is characterized in that, described to Calucium Silicate powder when levigate, in Calucium Silicate powder, mix the additive that weight is Calucium Silicate powder 0～30%, additive is magnesium oxide, ferric oxide, manganese oxide, phosphorus oxide Chemicals or waste residue blast furnace slag, copper smelter slag, ferromanganese slag, the yellow phosphorus furnace slag that contains above oxide compound, additive can mix separately, also can multiple mixing mix.
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012151767A1 (en) * | 2011-05-11 | 2012-11-15 | 内蒙古大唐国际再生资源开发有限公司 | Method for preparing alumina from high alumina fly ash and co-producing active calcium silicate |
| CN103373738A (en) * | 2012-04-19 | 2013-10-30 | 中国科学院过程工程研究所 | Fly ash low-temperature wet activating treatment method |
| CN104787774A (en) * | 2015-04-20 | 2015-07-22 | 国能神州高科技股份有限公司 | Method for preparing superfine high-whiteness calcium silicate micro powder |
| CN104818641A (en) * | 2015-05-08 | 2015-08-05 | 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 | Method for conducting fiber defibering and pulping on basis of fly ash desilicication liquid |
| CN105985776A (en) * | 2015-01-27 | 2016-10-05 | 中国科学院过程工程研究所 | Preparation method of soil conditioner being rich in citric acid soluble silicon |
| CN108424206A (en) * | 2018-06-04 | 2018-08-21 | 国家能源投资集团有限责任公司 | Flyash acid system residue of aluminum-extracted prepares the method containing silicon composite fertilizer and the utilization method containing silicon composite fertilizer and flyash |
| CN108424207A (en) * | 2018-06-04 | 2018-08-21 | 国家能源投资集团有限责任公司 | Flyash acid system residue of aluminum-extracted prepares the method containing silicon potassium compound fertilizer and the utilization method containing silicon potassium compound fertilizer and flyash |
| CN111606339A (en) * | 2020-05-22 | 2020-09-01 | 内蒙古蒙泰集团有限公司 | Method for preparing aluminum-silicon oxide by using fly ash |
| CN113045341A (en) * | 2019-12-26 | 2021-06-29 | 国家能源投资集团有限责任公司 | Method for preparing alkali-free silicon fertilizer from silicon-containing acid treatment solution and alkali-free silicon fertilizer |
| CN113149718A (en) * | 2021-04-28 | 2021-07-23 | 东北大学 | Method for preparing silicon-potassium compound fertilizer by using fly ash |
| CN113321230A (en) * | 2020-02-28 | 2021-08-31 | 国家能源投资集团有限责任公司 | Method for preparing aluminum oxide and silicon fertilizer by using fly ash |
| CN114478083A (en) * | 2022-02-17 | 2022-05-13 | 兴安盟博源化学有限公司 | Method for preparing silicon fertilizer from coarse slag of gasification furnace |
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2008
- 2008-05-26 CN CNA2008101126209A patent/CN101591197A/en active Pending
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9139445B2 (en) | 2011-05-11 | 2015-09-22 | Inner Mongolia Datang International Recycling Resource Development Co., Ltd. | Method for co-producing alumina and activated calcium silicate from high-alumina fly ash |
| WO2012151767A1 (en) * | 2011-05-11 | 2012-11-15 | 内蒙古大唐国际再生资源开发有限公司 | Method for preparing alumina from high alumina fly ash and co-producing active calcium silicate |
| CN103373738A (en) * | 2012-04-19 | 2013-10-30 | 中国科学院过程工程研究所 | Fly ash low-temperature wet activating treatment method |
| CN105985776B (en) * | 2015-01-27 | 2020-07-17 | 中国科学院过程工程研究所 | Preparation method of soil conditioner rich in citric acid soluble silicon |
| CN105985776A (en) * | 2015-01-27 | 2016-10-05 | 中国科学院过程工程研究所 | Preparation method of soil conditioner being rich in citric acid soluble silicon |
| CN104787774A (en) * | 2015-04-20 | 2015-07-22 | 国能神州高科技股份有限公司 | Method for preparing superfine high-whiteness calcium silicate micro powder |
| CN104818641A (en) * | 2015-05-08 | 2015-08-05 | 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 | Method for conducting fiber defibering and pulping on basis of fly ash desilicication liquid |
| CN108424206A (en) * | 2018-06-04 | 2018-08-21 | 国家能源投资集团有限责任公司 | Flyash acid system residue of aluminum-extracted prepares the method containing silicon composite fertilizer and the utilization method containing silicon composite fertilizer and flyash |
| CN108424207A (en) * | 2018-06-04 | 2018-08-21 | 国家能源投资集团有限责任公司 | Flyash acid system residue of aluminum-extracted prepares the method containing silicon potassium compound fertilizer and the utilization method containing silicon potassium compound fertilizer and flyash |
| CN113045341A (en) * | 2019-12-26 | 2021-06-29 | 国家能源投资集团有限责任公司 | Method for preparing alkali-free silicon fertilizer from silicon-containing acid treatment solution and alkali-free silicon fertilizer |
| CN113321230A (en) * | 2020-02-28 | 2021-08-31 | 国家能源投资集团有限责任公司 | Method for preparing aluminum oxide and silicon fertilizer by using fly ash |
| CN113321230B (en) * | 2020-02-28 | 2022-06-14 | 国家能源投资集团有限责任公司 | Method for preparing aluminum oxide and silicon fertilizer by using fly ash |
| CN111606339A (en) * | 2020-05-22 | 2020-09-01 | 内蒙古蒙泰集团有限公司 | Method for preparing aluminum-silicon oxide by using fly ash |
| CN111606339B (en) * | 2020-05-22 | 2023-01-10 | 内蒙古蒙泰集团有限公司 | Method for preparing aluminum-silicon oxide by using fly ash |
| CN113149718A (en) * | 2021-04-28 | 2021-07-23 | 东北大学 | Method for preparing silicon-potassium compound fertilizer by using fly ash |
| WO2022227182A1 (en) * | 2021-04-28 | 2022-11-03 | 东北大学 | Method for preparing silicon-potassium compound fertilizer by using fly ash |
| CN114478083A (en) * | 2022-02-17 | 2022-05-13 | 兴安盟博源化学有限公司 | Method for preparing silicon fertilizer from coarse slag of gasification furnace |
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Open date: 20091202 |