CN106466597B - One kind hydrolyzing the method for obtaining denitrating catalyst titanium silicon powder using silica solution as crystal seed - Google Patents
One kind hydrolyzing the method for obtaining denitrating catalyst titanium silicon powder using silica solution as crystal seed Download PDFInfo
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Abstract
The invention discloses one kind using silica solution as crystal seed, hydrolyzes the method for obtaining denitrating catalyst titanium silicon powder.The method of the invention is using the titanium liquid obtained in sulfate process titanium dioxide production process, it is crystal seed with acidic silicasol, it is hydrolyzed, metatitanic acid after hydrolysis removes impurity through washing, then it is adjusted after the pH value of metatitanic acid slurries is 6.5~7.0 and is filtered with ammonium hydroxide or carbonic acid hydrogen ammonium, roasting is dried in obtained filter cake, obtains denitrating catalyst titanium silicon powder.The present invention can obtain silica, equally distributed titanium silicon powder realizes the oxidation rate of sulfur dioxide for significantly reducing denitrating catalyst, can also improve mechanical performance under the premise of smaller silicon additive amount on the titanium dioxide, is suitble to promote and apply in the industry.
Description
Technical field
The present invention relates to titanium silicon powder preparation fields, and in particular to for one kind using silica solution as crystal seed, hydrolysis obtains denitration catalyst
The method of agent titanium silicon powder.
Technical background
The nitrogen oxides that coal combustion generates is mainly that nitric oxide (account for nitrogen oxides total amount 95%) and nitrogen dioxide (account for
The 5% of nitrogen oxides total amount), they are very big to the toxicity of people, damage plant, form photochemical fog and acid rain.Along with me
The consumption of state's sustained and rapid development of economy, coal resource is continuously increased, and the discharge of NOx also increases rapidly in atmosphere, has been constituted
To grave danger of ecological environment and people's health.Country, which also puts into effect, carries out by force the industrial furnaces such as power plant, steel plant, glass factory
The denitration policy of property processed.
Currently, domestic thermal power plant is mainly using NH3-SCR denitration technology, and most efficient denitration skill at present
Art, the core of the technology are denitrating catalysts.The substrate of denitrating catalyst is TiO2With a small amount of sulphur, auxiliary agent WO3, active group
It is divided into V2O5, there are also some other surfactant and shaping assistants.Most of denitrating catalyst is additionally added a small amount of SiO2, generally
It is added by predecessor of White Carbon black, main function is the mechanical strength of honeycomb catalyst after enhancing molding, while there are also inhibit to urge
Agent is to SO2Oxidation.But the mode of silicon is added to be mainly denitrating catalyst factory in the white carbon of mix stage addition at present
It is black.The granularity of White Carbon black is relatively large, thus can not be formed and be uniformly distributed on a catalyst, to inhibition SiO2Oxidation has
Limit, and it is also limited to the enhancing of mechanical strength.And the additive amount of White Carbon black is also limited, otherwise can significantly reduce denitration performance.
Summary of the invention
It is an object of the invention to the deficiencies according to existing for the denitrating catalyst in current denitration technology, provide a kind of high property
The denitrating catalyst titanium silicon powder of energy, can be under the premise of smaller silicon additive amount, and realizing significantly reduces the two of denitrating catalyst
Silica alumina can also improve mechanical performance.
Above-mentioned purpose of the present invention is achieved by the following technical programs:
One kind hydrolyzing the method for obtaining denitrating catalyst titanium silicon powder using silica solution as crystal seed, is using sulfate process titanium dioxide
The titanium liquid obtained in production process, is crystal seed with acidic silicasol, is hydrolyzed, and the metatitanic acid after hydrolysis removes impurity elimination through washing
Then matter is adjusted after the pH value of metatitanic acid slurries is 6.5~7.0 with ammonium hydroxide or carbonic acid hydrogen ammonium and is filtered, obtained filter cake is done
Dry roasting obtains silica equally distributed titanium silicon powder on the titanium dioxide.
As a kind of more preferably technical solution, the concentration of the titanium liquid is 170~220g/L, iron titanium ratio is 2.6~
3.5, F values are 1.65~1.85.
As a kind of more preferably technical solution, the temperature of the drying and roasting is 550~630 DEG C, heating rate 100
~150 DEG C/h.
As a kind of more preferably technical solution, in terms of silica, the additive amount of the crystal seed is titanium dioxide quality
1~10%.
Compared with prior art, the invention has the following beneficial effects:
(1) present invention uses crystal seed of the silica solution as titanium hydrolysis, and in hydrolytic process, titanyl sulfate is in silica solution crystalline substance
Homoepitaxial on body, it is hereby achieved that silica equally distributed titanium silicon powder on the titanium dioxide；
(2) titanium silicon powder of the present invention can be under the premise of smaller silicon additive amount, and realizing significantly reduces the two of denitrating catalyst
Silica alumina can also improve mechanical performance.
Specific embodiment
Below with reference to embodiment, the present invention is further elaborated.But embodiment only expresses several implementations of the invention
Mode, the description thereof is more specific and detailed, and but it cannot be understood as limitations on the scope of the patent of the present invention.It should be understood that
, for those of ordinary skill in the art, without departing from the inventive concept of the premise, several changes can also be made
Shape and improvement, these are all within the scope of protection of the present invention.
Embodiment 1
Titanium liquid 5L, concentration 180g/L made from the Production By Sulfuric Acid Process coating process of calculation amount are weighed, and contains SiO2The acid of 45g
Property silica solution (concentration 30%), the two, which is heated separately to 75 degree, pours into silica solution in titanium liquid, after mixing evenly quickly heating
It to gentle boil, and is slowly stirred, after being kept for 3 hours, filters, cleaning.Ammonium hydroxide or ammonium bicarbonate is added toward clean slurries, adjusts
PH value after filtering, rises to 630 degree with the heating rate of 150 degree/hour, obtains titanium silicon powder to 6.8.
Embodiment 2
Titanium liquid 5L, concentration 170g/L made from the Production By Sulfuric Acid Process coating process of calculation amount are weighed, and contains SiO2The acid of 9g
Property silica solution (concentration 30%), the two, which is heated separately to 75 degree, pours into silica solution in titanium liquid, after mixing evenly quickly heating
It to gentle boil, and is slowly stirred, after being kept for 3 hours, filters, cleaning.Ammonium hydroxide or ammonium bicarbonate is added toward clean slurries, adjusts
PH value after filtering, rises to 550 degree with the heating rate of 100 degree/hour, obtains titanium silicon powder to 7.5.
Embodiment 3
Titanium liquid 5L, concentration 220g/L made from the Production By Sulfuric Acid Process coating process of calculation amount are weighed, and contains SiO2The acid of 90g
Property silica solution (concentration 30%), the two, which is heated separately to 75 degree, pours into silica solution in titanium liquid, after mixing evenly quickly heating
It to gentle boil, and is slowly stirred, after being kept for 3 hours, filters, cleaning.Ammonium hydroxide or ammonium bicarbonate is added toward clean slurries, adjusts
PH value after filtering, rises to 580 degree with the heating rate of 120 degree/hour, obtains titanium silicon powder to 6.5.
Claims (4)
1. one kind using silica solution as crystal seed, hydrolyzes the method for obtaining denitrating catalyst titanium silicon powder, it is characterised in that the method
It is to be crystal seed with acidic silicasol, be hydrolyzed using the titanium liquid obtained in sulfate process titanium dioxide production process, the inclined titanium after hydrolysis
Acid removes impurity through washing, is then adjusted after the pH value of metatitanic acid slurries is 6.5~7.0 and is filtered with ammonium hydroxide or carbonic acid hydrogen ammonium, obtained
To filter cake roasting is dried, obtain silica equally distributed titanium silicon powder on the titanium dioxide.
2. it is according to claim 1 using silica solution as crystal seed, the method for obtaining denitrating catalyst titanium silicon powder is hydrolyzed, it is special
Sign is that the concentration of the titanium liquid is 170~220g/L, and iron titanium ratio is that 2.6~3.5, F value is 1.65~1.85.
3. it is according to claim 1 using silica solution as crystal seed, the method for obtaining denitrating catalyst titanium silicon powder is hydrolyzed, it is special
Sign is that the temperature of the drying and roasting is 550~630 DEG C, and heating rate is 100~150 DEG C/h.
4. it is according to claim 1 using silica solution as crystal seed, the method for obtaining denitrating catalyst titanium silicon powder is hydrolyzed, it is special
Sign is that in terms of silica, the additive amount of the crystal seed is the 1~10% of titanium dioxide quality.
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| CN103351024A (en) * | 2013-06-14 | 2013-10-16 | 浏阳市鸿泰钛业制造有限公司 | Production process of ultrafine titanium dioxide especially used in flue gas denitration catalyst |
| CN103861574A (en) * | 2014-02-28 | 2014-06-18 | 中国海洋石油总公司 | Method for preparing titanium-silicon composite oxide |
| US20150118149A1 (en) * | 2013-10-29 | 2015-04-30 | China Petroleum & Chemical Corporation | Titanium silicalite molecular sieve and its synthesis |
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| CN1546226A (en) * | 2003-12-17 | 2004-11-17 | 同济大学 | TiO2/SiO2 aerogel and method for making same |
| CN102198397A (en) * | 2011-03-30 | 2011-09-28 | 中国科学院广州能源研究所 | Nano titanium dioxide (TiO2) for flue gas denitration catalyst and preparation method thereof |
| CN103351024A (en) * | 2013-06-14 | 2013-10-16 | 浏阳市鸿泰钛业制造有限公司 | Production process of ultrafine titanium dioxide especially used in flue gas denitration catalyst |
| US20150118149A1 (en) * | 2013-10-29 | 2015-04-30 | China Petroleum & Chemical Corporation | Titanium silicalite molecular sieve and its synthesis |
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