CN102442675A - Sodium silicate deferrization refining method - Google Patents
Sodium silicate deferrization refining method Download PDFInfo
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- CN102442675A CN102442675A CN2010105075345A CN201010507534A CN102442675A CN 102442675 A CN102442675 A CN 102442675A CN 2010105075345 A CN2010105075345 A CN 2010105075345A CN 201010507534 A CN201010507534 A CN 201010507534A CN 102442675 A CN102442675 A CN 102442675A
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- water glass
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- sodium silicate
- stoste
- sinking agent
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Abstract
The invention discloses a sodium silicate deferrization refining method, through the method of adding chemical sedimentation agent, ferric ion and other metal ions in sodium silicate can be reacted with the sedimentation agent to produce solid particles with larger particle size, and then the particles are removed through filtering. The method disclosed by the invention is simple in process, is good in deferrization effect and is low in cost. With the method disclosed by the invention, pure sodium silicate products with the ferric content less than or equal to 5PPM can be obtained. Other metal ions can be simultaneously removed. Through the detection, the key technical indexes are as follows: Fe is less than or equal to 5PPM, Ca is less than or equal to 3 PPM, Cu is less than or equal to 5 PPM, Mg is less than or equal to 5 PPM, other heavy metals can be basically removed, and the broad selection space for the application of the sodium silicate can be provided.
Description
Technical field
The present invention relates to a kind of method of removing each metal ion species such as iron in the water glass, belong to the process for refining of inorganic silicon chemical raw material.
Background technology
Water glass all is one of very important Inorganic Chemicals in traditional industry still is modern industry; It is except being used as washing composition and binder ingredients; Still make the important source material of a series of fine chemicals such as silica gel, molecular sieve, silicon sol, WHITE CARBON BLACK, the quality of water glass itself is a purity has very big influence for the production and the quality of its derived product, and water glass stoste is mixed with a large amount of impurity in process of production; Very muddy; Adopt settling methods that this stoste is purified traditionally, but the equipment that this method adopts is huge, floor space big and inferior separating effect, particularly when water glass proportion is big; Even through the sedimentation of long period, still can not get more purified water glass.In addition, use this method also to receive the influence of temperature etc., when adopting settling process in the winter time, because the low water glass viscosity that makes of temperature becomes big, the effect of settling variation, efficient reduces.
Improved method also has centrifugal settling and filtration method.Though wherein centrifugal settling method can make the water glass quality be greatly improved, but still can not get highly purified product.The normal filter method that adopts is produced high purity silicic acid sodium in the modern crafts.
Chinese patent 921109466 discloses a kind of " process for refining of water glass ", and this method is made into the precoating slurries through in filtrating, adding flocculating aids; Then the precoating slurries are got on the filter with pump, flocculating aids forms precoated layer on filtration medium, will mix the sodium orthosilicate slurries of flocculating aids again and squeeze into filter; Filtration medium or precoated layer carry the solid particulate in the stoste and stay; Form filter cake, liquid then through filter cake, becomes the purified water glass.This method will be squeezed into filter twice with filtered liq, and technology is comparatively complicated, and the precoating time is longer, and production efficiency is low, and energy consumption is big.
Chinese patent 021182027 disclosed a kind of " the precise microfiltration process for refining of water glass "; The flocculating aids that will contain perlite and be main auxiliary material mixes in the water glass stoste; Squeeze into precise microporous filter with pump and filter, once can get the refining water glass of good clarity through the rigidity microfiltration tube.
Above-mentioned water glass process for purification mainly is through the physical filtering method water glass to be made with extra care; This method can be removed the solid impurity in the water glass; But the metallic impurity that exist with ionic state are in a large number arranged in water glass, and especially ubiquitous iron ion can't be removed through filter type merely.And the existence of these metals ions has limited the use of water glass on higher level product.
Summary of the invention
The purpose of this invention is to provide a kind of water glass deironing process for purification, this method can be removed multiple metals ion such as iron ion in the water glass, obtains highly purified water glass.
The present invention includes sedimentation and filtration step, technological process: the sodium sulphite sinking agent that in water glass stoste, adds water glass stoste weight 3-6%; It is characterized in that described sodium sulphite add-on is excessive, guarantee sulfonium ion can with solution after the metals ion complete reactions such as iron in the water glass in have the sulfonium ion of capacity to exist.Place reaction kettle to be heated to 60-70 ℃ and continuously stirring 30-60 minute the water glass stoste of adding sinking agent, add water glass stoste weight 1-2% again and help sinking agent copper sulfate, continuously stirring 30-60 minute; It is characterized in that adding an amount of sinking agent copper sulfate that helps; Because metal ion content is extremely low in the water glass; The settling that metals ion in sulfonium ion and the water glass generates is atomic little; Can't add and help the cupric sulfide absorption Iron sulfuret coprecipitation that generates behind the sinking agent copper sulfate through removing by filter.The sodium silicate liquid that will contain reaction product is squeezed into and is left standstill 24-72 hour in the slurry tank; To carry out secondary filter through the water glass stoste that leaves standstill processing and must make with extra care the water glass product.It is characterized in that iron removal do not bring new foreign ion into.Sulfonium ion unnecessary in the water glass solution can be removed through heating.
The present invention makes iron ion and other metals ion and the big solid particulate of sinking agent reaction generation particle diameter in the water glass through adding the method for chemical settling agent, filters out through crossing then.Method technology of the present invention is simple, good iron removal effect, and cost is low.Can obtain the pure water glass product of iron level through method of the present invention smaller or equal to 5PPM.Other metals ion also is eliminated basically simultaneously.Following through detecting its key technical indexes:
Fe≤5PPM, Ca≤3PPM, Cu≤5PPM, Mg≤5PPM, other heavy metal basically eliminate.For the purposes of water glass provides broad selection space.
Description of drawings
Accompanying drawing is a process flow sheet of the present invention.
Embodiment
The present invention mainly is through adding chemical settling agent sodium sulphite and helping the method for sinking agent copper sulfate to remove the metals ion iron ion particularly in the sodium water glass.As shown in the figure, the water glass in the water glass jar 1 is squeezed in the reaction kettle 2, in the water glass of reaction kettle, add the sodium sulphite of 3-6%, reaction as follows, take place in the copper sulfate of 1-2%:
Na
2S+Fe
2+.Fe
3+→Fe
2S
3.FeS↓
Na
2S+Cu
2+→CuS↓
Iron ion, cupric ion and sulfonium ion generate solid particulate in above-mentioned reaction, and the water glass that will contain reactant is squeezed into slurry tank 3 and precipitated, and after sedimentary water glass filters through accurate filter 4, squeezes into finished product jar 5 again.The filtration medium that wherein smart filtration journey is used is zeyssatite and/or gac.Processing can obtain the water glass product that iron level is less than or equal to 5PPM through present method.Its reaction process is simple, and technology is simple, and de-ferrous effect is remarkable.
Proportion 1.4, modulus 3.0, iron-holder is sent into reaction kettle for 1400 kilograms greater than the sodium water glass of 30PPM; Add 42 kilograms of industrial sodium sulfides, copper sulfate 14kg stirs and is heated to 60 ℃; Continuously stirring 45 minutes; Then reactant is sent into slurry tank and leave standstill 36 hours after-filtration, get pure water glass product, wherein iron level 4.8PPM.
Proportion 1.1, modulus 2.6,1100 kilograms of the sodium water glass of iron level 25PPM; Place in the reaction kettle, add 44 kilograms of industrial sodium sulfides, copper sulfate 11kg; Stirring also is heated to 65 ℃, and continuously stirring 30 minutes imports heavy jar with reactant and leaves standstill 24 hours after-filtration; Get pure water glass product, wherein iron level 4.7PPM.
Proportion 1.3 moduluses 3.4,1300 kilograms of the sodium water glass of iron level 15PPM add 78 kilograms of industrial sodium sulfides; Copper sulfate 13kg stirs and is heated to 70 ℃, continuously stirring 60 minutes; Import slurry tank and leave standstill 72 hours after-filtration, getting iron level is the pure water glass product of 4.9PPM.
Proportion 1.2, modulus 3.2,1200 kilograms of the sodium water glass of iron level 18PPM; Place in the reaction kettle, add 12 kilograms in 60 kilograms of industrial sodium sulfides, copper sulfate, stir and be heated to 66 ℃; Continuously stirring 50 minutes; Reactant is imported heavy jar leave standstill 48 hours after-filtration, get pure water glass product, wherein iron level 4.85PPM.
Proportion 1.29,1290 kilograms of the sodium water glass of modulus 3.2 place in the reaction kettle; Add 1.29 kilograms in 51.6 kilograms of industrial sodium sulfides, copper sulfate; Stirring also is heated to 63 ℃, and continuously stirring 50 minutes imports heavy jar with reactant and leaves standstill 50 hours after-filtration; Get pure water glass product, wherein iron level 4.5PPM.
Claims (2)
1. water glass deironing process for purification mainly comprises sedimentation and filtration step, technological process: the sodium sulphite sinking agent that in water glass stoste, adds water glass stoste weight 3-6%; It is characterized in that described sodium sulphite add-on is excessive, guarantee sulfonium ion can with solution after the metals ion complete reactions such as iron in the water glass in have the sulfonium ion of capacity to exist.Place reaction kettle to be heated to 60-70 ℃ and continuously stirring 30-60 minute the water glass stoste of adding sinking agent, add water glass stoste weight 1-2% again and help sinking agent copper sulfate, continuously stirring 30-60 minute;
2. water glass deironing process for purification according to claim 1; It is characterized in that adding an amount of sinking agent copper sulfate that helps; Because metal ion content is extremely low in the water glass; The settling that metals ion in sulfonium ion and the water glass generates is atomic little, can't add and help the cupric sulfide absorption Iron sulfuret coprecipitation that generates behind the sinking agent copper sulfate through removing by filter.The sodium silicate liquid that will contain reaction product is squeezed into and is left standstill 24-72 hour in the slurry tank; To carry out secondary filter through the water glass stoste that leaves standstill processing and must make with extra care the water glass product.
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| CN2010105075345A CN102442675A (en) | 2010-10-15 | 2010-10-15 | Sodium silicate deferrization refining method |
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| CN2010105075345A CN102442675A (en) | 2010-10-15 | 2010-10-15 | Sodium silicate deferrization refining method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103332699A (en) * | 2013-06-13 | 2013-10-02 | 福建远翔化工有限公司 | Sodium silicate de-ironing method |
| CN103408029A (en) * | 2013-08-20 | 2013-11-27 | 南京林业大学 | Method for deeply removing iron ions in water glass |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101423223A (en) * | 2008-11-12 | 2009-05-06 | 山西天一纳米材料科技有限公司 | Impurity removal and purification method for waterglass |
-
2010
- 2010-10-15 CN CN2010105075345A patent/CN102442675A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101423223A (en) * | 2008-11-12 | 2009-05-06 | 山西天一纳米材料科技有限公司 | Impurity removal and purification method for waterglass |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103332699A (en) * | 2013-06-13 | 2013-10-02 | 福建远翔化工有限公司 | Sodium silicate de-ironing method |
| CN103332699B (en) * | 2013-06-13 | 2016-03-02 | 福建远翔新材料股份有限公司 | A kind of sodium silicate deferrization method |
| CN103408029A (en) * | 2013-08-20 | 2013-11-27 | 南京林业大学 | Method for deeply removing iron ions in water glass |
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Application publication date: 20120509 |