CN1282605C - Production method of sodium metasilicate nonahydrate - Google Patents
Production method of sodium metasilicate nonahydrate Download PDFInfo
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- CN1282605C CN1282605C CN 200310105317 CN200310105317A CN1282605C CN 1282605 C CN1282605 C CN 1282605C CN 200310105317 CN200310105317 CN 200310105317 CN 200310105317 A CN200310105317 A CN 200310105317A CN 1282605 C CN1282605 C CN 1282605C
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- caustic soda
- liquid caustic
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- sodium oxide
- silica powder
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Abstract
The present invention relates to a production method for sodium metasilicate nonahydrate. Sodium metasilicate nonahydrate is prepared from the reaction of quartz powder containing more than 90% of silicon dioxide with liquid alkali containing 23 to 60 % of sodium oxide via crystallisation by cooling. In the present invention, the quartz powder with high silicon dioxide content and the liquid alkali are used as reaction raw materials and react under the conditions of heating and pressurization, and then crystallisation is directly carried out by cooling; a production process that sodium metasilicate nonahydrate is obtained by one step is realized. When the liquid alkali with high sodium oxide content is used, water is directly added in the reaction raw materials, and products can be obtained in the same way. The present invention has the advantages of low production cost, less environment pollution and favorable economical and social benefits.
Description
Technical field
The present invention relates to the production method of non-hydrate sodium metasilicate.
Background technology
The common in the market production technique of non-hydrate sodium metasilicate is to adopt the reaction production technique of water glass and sodium hydroxide, production cost height.
Summary of the invention
Technical problem to be solved by this invention provides a kind of production method of the step production non-hydrate sodium metasilicate that reduces production costs.
The production method of non-hydrate sodium metasilicate of the present invention, it is characterized in that being is that silica powder more than 90% and sodium oxide content are that 23～60% liquid caustic soda reaction generates with dioxide-containing silica, the consumption of reaction raw materials, silica powder is in silicon-dioxide, liquid caustic soda is in sodium oxide, the weight percent that silicon-dioxide and sodium oxide account for the raw material total amount is respectively 19～21% and 20～25%, the reaction of silica powder and liquid caustic soda is to be 150～200 ℃ in temperature, carry out under 7～9 normal atmosphere of pressure, in 2～8 hours reaction times, 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, directly carries out crystallization after reaction is finished, and has accomplished step production non-hydrate sodium metasilicate.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 25～30%, in this preferred value, silica powder and liquid caustic soda reaction can directly obtain meeting the non-hydrate sodium metasilicate of national standard, be higher than this preferred value, also be that the sodium oxide content of liquid caustic soda is when high, can be by in reaction raw materials, keeping the skin wet and reaction raw materials one reacts reaching the product of criterion of acceptability, the control amount of water makes the percentage composition of sodium oxide in liquid caustic soda and the silica powder and silica comprises raw material total amount (comprising water) 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 19～21% and 20～25%.The weight percent of silicon-dioxide and sodium oxide is respectively in the non-hydrate sodium metasilicate of national Specification: 19～21% and 20～23%, 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 actual amount of sodium oxide has increased about 1% than theoretical consumption in the reaction raw materials.The silica powder of different concns and liquid caustic soda adopt the consumption that is fit to according to this proportioning.
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, 2～8 hours reaction times.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 by reaction raw materials heating, direct crystallisation by cooling has then realized that a step obtains the production technique of non-hydrate sodium metasilicate, and 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 been saved production cost greatly, 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 805kg (sodium oxide content 28%) is input in the metering agitated pool, after starting stirring, add the measured silica powder 195kg of scale (more than 200 orders, dioxide-containing silica 99%), 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, material in cylinder or the reactor is flowed in the crystallizer tank, treat that temperature adds 10% crystal seed (non-hydrate sodium metasilicate) natural cooling crystallization when being cooled to 62 ℃, centrifugal, the weighing packing.
Embodiment two:
Production technique is with embodiment one, liquid caustic soda 800kg (sodium oxide content 30%) wherein, silica powder 200kg (dioxide-containing silica 96%).
Embodiment three:
Production technique is with embodiment one, liquid caustic soda 800kg (sodium oxide content 25%) wherein, silica powder 200kg (dioxide-containing silica 98%).
Embodiment four:
With impeller pump with liquid caustic soda 640kg (80% of 800kg, wherein sodium oxide content 30%), be input in the metering agitated pool, after starting stirring, add the measured silica powder 200kg of scale (dioxide-containing silica 96%), 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 ℃, is controlled at 8 normal atmosphere, after 6 hours, open baiting valve, the liquid caustic soda (sodium oxide content 30%) of material in cylinder or the reactor and 160kg is mixed flow in the crystallizer tank, treat that temperature adds 10% crystal seed (non-hydrate sodium metasilicate) natural cooling crystallization when being cooled to 62 ℃, centrifugal, the weighing packing.
Embodiment five:
Production technique is with embodiment one, liquid caustic soda 778kg (sodium oxide content 30%) wherein, silica powder 222kg (dioxide-containing silica 90%).
Embodiment six:
Production technique is with embodiment one, liquid caustic soda 790kg (sodium oxide content 28%) wherein, silica powder 210kg (dioxide-containing silica 98%).
Embodiment seven:
Production technique is with embodiment one, liquid caustic soda 790kg (sodium oxide content 27%) wherein, silica powder 210kg (dioxide-containing silica 98%).
Embodiment eight:
Production technique is with embodiment one, liquid caustic soda 500kg (sodium oxide content 50%) wherein, and silica powder 210kg (dioxide-containing silica 98%) adds water 290kg in the reaction raw materials in cylinder or reactor.
Embodiment nine:
Production technique is with embodiment one, liquid caustic soda 400kg (sodium oxide content 60%) wherein, and silica powder 210kg (dioxide-containing silica 98%) adds water 390kg in the reaction raw materials in cylinder or reactor.
Claims (5)
1, a kind of production method of non-hydrate sodium metasilicate, it is characterized in that being is that silica powder more than 90% and sodium oxide content are that 23～60% liquid caustic soda reaction generates with dioxide-containing silica, the consumption of reaction raw materials, silica powder is in silicon-dioxide, liquid caustic soda is in sodium oxide, the weight percent that silicon-dioxide and sodium oxide account for the raw material total amount is respectively 19～21% and 20～25%, the reaction of silica powder and liquid caustic soda is to be 150～200 ℃ in temperature, carry out under 7～9 normal atmosphere of pressure, in 2～8 hours reaction times, 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 25～30%.
4, production method according to claim 1 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.
5, production method according to claim 1 is characterized in that the sodium oxide content of liquid caustic soda is higher than at 30% o'clock, adds water in reaction raw materials, and the control amount of water makes the percentage composition of sodium oxide in liquid caustic soda and the silica powder and silica comprises raw material total amount constant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310105317 CN1282605C (en) | 2003-10-13 | 2003-10-13 | Production method of sodium metasilicate nonahydrate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310105317 CN1282605C (en) | 2003-10-13 | 2003-10-13 | Production method of sodium metasilicate nonahydrate |
Publications (2)
| Publication Number | Publication Date |
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| CN1607178A CN1607178A (en) | 2005-04-20 |
| CN1282605C true CN1282605C (en) | 2006-11-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200310105317 Expired - Fee Related CN1282605C (en) | 2003-10-13 | 2003-10-13 | Production method of sodium metasilicate nonahydrate |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101837985B (en) * | 2010-05-07 | 2012-04-18 | 南昌大学 | Preparation method of sodium metasilicate nonahydrate |
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