CN1607177A - Production method of sodium metasilicate pentahydrate - Google Patents
Production method of sodium metasilicate pentahydrate Download PDFInfo
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- CN1607177A CN1607177A CN 200310105316 CN200310105316A CN1607177A CN 1607177 A CN1607177 A CN 1607177A CN 200310105316 CN200310105316 CN 200310105316 CN 200310105316 A CN200310105316 A CN 200310105316A CN 1607177 A CN1607177 A CN 1607177A
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- caustic soda
- liquid caustic
- sodium oxide
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Abstract
A productive method for sodium metasilicate pentahydrate wherein quartz powder containing more than 90 % of silicon dioxide and liquid alkali containing 38-80 % of sodium oxide are use as raw material and reacted under being pressured and heated, through cooling and catalyzing after reaction to obtain said products. Said invention greatly reduces cost and avoids environment pollution.
Description
Technical field
The present invention relates to the production method of metasilicate pentahydrate sodium.
Background technology
The common in the market production technique of metasilicate pentahydrate sodium is to adopt the reaction production technique of water glass and sodium hydroxide, in its production process, all will pass through this treating processes of transpiring moisture.This treating processes has not only directly increased production cost, and uses coal combustion, has caused environmental pollution.
Summary of the invention
Technical problem to be solved by this invention provides a kind of production method of producing metasilicate pentahydrate sodium without transpiring moisture, reduces production costs.
The production method of metasilicate pentahydrate sodium of the present invention is characterized in that being is that silica powder more than 90% and sodium oxide content are that 38～80% liquid caustic soda is a reaction raw materials with dioxide-containing silica, and reaction is finished after the overcooling crystallization makes.
It is reaction raw materials that the present invention adopts the silica powder of high silicon dioxide content and liquid caustic soda, need not pass through this step of transpiring moisture after reaction is finished, and directly carries out crystallization, has accomplished step production metasilicate pentahydrate sodium.The preferred dioxide-containing silica of silica powder is more than 96%, more preferably more than 98%.The preferred sodium oxide content of liquid caustic soda is 41～50%, in this preferred value, silica powder and liquid caustic soda reaction can directly obtain meeting the metasilicate pentahydrate sodium of national standard, be higher than this preferred value, also be the sodium oxide content of liquid caustic soda when high, can be by in reaction raw materials, keeping the skin wet and reaction raw materials one reacts to reach the product of criterion of acceptability.Amount of water makes sodium oxide, the percentage composition of silicon-dioxide in total raw material (comprising water) in liquid caustic soda, the silica powder constant.Adopt the production cost of the liquid caustic soda (price height own) of high-content sodium oxide to increase.
The reaction consumption of silica powder and liquid caustic soda is respectively in silicon-dioxide and sodium oxide, and the weight percent that silicon-dioxide and sodium oxide account for the raw material total amount is respectively (27～29) % and (28～34) %.The weight percent of silicon-dioxide and sodium oxide is respectively in the metasilicate pentahydrate sodium of national Specification: (27～29) % and (28～30) %, if technology controlling and process is good, can determine the consumption of silica powder and liquid caustic soda according to this proportioning, consider the loss in the production process, the comparable theoretical consumption of the consumption of sodium oxide increases about 3% in the reaction raw materials, also is that the weight percent that sodium oxide accounts for the raw material total amount is (31～34) %.The silica powder of different concns and liquid caustic soda adopt the consumption that is fit to according to said ratio.
The present invention both can obtain product by direct reaction according to above reaction raw materials, also can be according to the silicon-dioxide of afore mentioned rules and the consumption of sodium oxide, the liquid caustic soda that accounts for liquid caustic soda total amount 80% reacts with silica powder earlier, after finishing, reaction mixes with remaining liquid caustic soda again, crystallization also obtains product of the present invention.
Silica powder and liquid caustic soda should carry out heating to depress, and temperature is 150～200 ℃, and pressure is 7～9 normal atmosphere, and the reaction times is 2～8 hours.The fineness of silica powder is preferably in more than 200 orders, and is thin more, is beneficial to reaction more, and the reaction times shortens.The pressing mode of heating can be industrial mode commonly used, as steam boiler pressurization, and the thermal oil pressurization etc. of heating.
The same prior art of crystallisation by cooling process after reaction is finished.
Advantage of the present invention:
Simplified production technique, depressed reaction heating, then direct crystallisation by cooling by reaction raw materials, do not need to boil off again moisture, realized that a step obtains the production technique of metasilicate pentahydrate sodium, when adopting high-load sodium oxide liquid caustic soda, directly moisturizing obtains product equally in reaction raw materials.Production method of the present invention has not only been saved production cost greatly, and has avoided environmental pollution, has good economic benefit and social benefit, and the quality product that obtains meets national standard.
Embodiment
Below with embodiment production method of the present invention is described, but do not limit the present invention.
Embodiment one:
With impeller pump liquid caustic soda 72kg (sodium oxide content 45%) is input in the metering agitated pool, after starting stirring, add the measured silica powder 28kg of scale (more than 200 orders, dioxide-containing silica 98%), treat that evenly the back is with in impeller pump input cylinder or the reactor, the stirring of logical steam running cylinder or reactor, temperature is 170 ℃, be controlled at 8 normal atmosphere, after 4 hours, open baiting valve, the material in cylinder or the reactor is flowed in the crystallizer tank, treat that temperature adds 10% crystal seed (metasilicate pentahydrate sodium) natural cooling crystallization when being cooled to 62 ℃, be ground into the above weighing packing of 100 orders.
Embodiment two:
Production technique is with embodiment one, liquid caustic soda 70.8kg (sodium oxide content 44%) wherein, silica powder 29.2kg (dioxide-containing silica 96%).Temperature of reaction is 180 ℃, and pressure is 9 normal atmosphere, 6 hours reaction times.
Embodiment three:
Production technique is with embodiment one, liquid caustic soda 70.8kg (sodium oxide content 46.6%) wherein, silica powder 29.2kg (dioxide-containing silica 96%).
Embodiment four:
With impeller pump with liquid caustic soda 57.12kg (80% of 71.4kg, wherein sodium oxide content 44.8%), be input in the metering agitated pool, after starting stirring, add the measured silica powder 28.6kg of scale (dioxide-containing silica 98%), treat that evenly the back is with in impeller pump input cylinder or the reactor, the stirring of logical steam running cylinder or reactor, temperature is 170 ℃, be controlled at 8 normal atmosphere, after 6 hours, open baiting valve, the liquid caustic soda (sodium oxide content 44.8%) of material in cylinder or the reactor and 14.28kg is mixed in the inflow crystallizer tank, treat that temperature adds 10% crystal seed (metasilicate pentahydrate sodium) natural cooling crystallization when being cooled to 62 ℃, be ground into the above weighing packing of 100 orders.
Embodiment five:
Production technique is with embodiment one, liquid caustic soda 68kg (sodium oxide content 50%) wherein, silica powder 32kg (dioxide-containing silica 90.6%).
Embodiment six:
Production technique is with embodiment one, liquid caustic soda 55kg (sodium oxide content 60%) wherein, and silica powder 28.6kg (dioxide-containing silica 98%) adds water 16.4kg in the reaction raw materials in cylinder or reactor.
Embodiment seven:
Production technique is with embodiment one, liquid caustic soda 42kg (sodium oxide content 80%) wherein, and silica powder 29.6kg (dioxide-containing silica 98%) adds water 28.4kg in the reaction raw materials in cylinder or reactor.
Claims (7)
1, a kind of production method of metasilicate pentahydrate sodium is characterized in that being is that silica powder more than 90% and sodium oxide content are that 38～80% liquid caustic soda is a reaction raw materials with dioxide-containing silica, and reaction is finished after the overcooling crystallization makes.
2, production method according to claim 1, the dioxide-containing silica that it is characterized in that silica powder is more than 96%.
3, production method according to claim 1, the sodium oxide content that it is characterized in that liquid caustic soda is 41～50%.
4, production method according to claim 1, the reaction that it is characterized in that silica powder and liquid caustic soda are to be 150～200 ℃ in temperature, carry out under 7～9 normal atmosphere of pressure.
5, according to claim 1,2 or 3 described production methods, the consumption that it is characterized in that reaction raw materials, silica powder is in silicon-dioxide, and liquid caustic soda is in sodium oxide, and the weight percent that silicon-dioxide and sodium oxide account for the raw material total amount is respectively (27～29) % and (28～34) %.
6, production method according to claim 5 is characterized in that the liquid caustic soda that accounts for liquid caustic soda total amount 80% reacts with silica powder earlier, mixes with remaining liquid caustic soda after reaction is finished, and makes through crystallization again.
7, production method according to claim 1 is characterized in that the sodium oxide content of liquid caustic soda is higher than at 50% o'clock, adds water in reaction raw materials, and amount of water makes sodium oxide, the percentage composition of silicon-dioxide in total raw material in liquid caustic soda, the silica powder constant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310105316 CN1282604C (en) | 2003-10-13 | 2003-10-13 | Production method of sodium metasilicate pentahydrate |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310105316 CN1282604C (en) | 2003-10-13 | 2003-10-13 | Production method of sodium metasilicate pentahydrate |
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| Publication Number | Publication Date |
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| CN1607177A true CN1607177A (en) | 2005-04-20 |
| CN1282604C CN1282604C (en) | 2006-11-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200310105316 Expired - Fee Related CN1282604C (en) | 2003-10-13 | 2003-10-13 | Production method of sodium metasilicate pentahydrate |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103738973A (en) * | 2013-12-17 | 2014-04-23 | 柳州东风化工股份有限公司 | Preparation method of sodium metasilicate pentahydrate |
| CN105540601A (en) * | 2016-01-26 | 2016-05-04 | 三祥新材股份有限公司 | Method for producing sodium metasilicate pentahydrate |
-
2003
- 2003-10-13 CN CN 200310105316 patent/CN1282604C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103738973A (en) * | 2013-12-17 | 2014-04-23 | 柳州东风化工股份有限公司 | Preparation method of sodium metasilicate pentahydrate |
| CN105540601A (en) * | 2016-01-26 | 2016-05-04 | 三祥新材股份有限公司 | Method for producing sodium metasilicate pentahydrate |
| CN105540601B (en) * | 2016-01-26 | 2018-02-06 | 三祥新材股份有限公司 | A kind of production method of metasilicate pentahydrate sodium |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1282604C (en) | 2006-11-01 |
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