CN103318994A - Method for preparing aluminum polysilicate by using polycrystalline silicon production raffinate and red mud - Google Patents
Method for preparing aluminum polysilicate by using polycrystalline silicon production raffinate and red mud Download PDFInfo
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- CN103318994A CN103318994A CN 201310259203 CN201310259203A CN103318994A CN 103318994 A CN103318994 A CN 103318994A CN 201310259203 CN201310259203 CN 201310259203 CN 201310259203 A CN201310259203 A CN 201310259203A CN 103318994 A CN103318994 A CN 103318994A
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- red mud
- raffinate
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- aluminium silicate
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Abstract
The invention discloses a method for preparing aluminum polysilicate by using polycrystalline silicon production raffinate and red mud, and relates to a production process for synthesizing aluminum polysilicate by using polycrystalline silicon production raffinate and aluminum oxide production waste red mud, i.e., a method for producing a wastewater flocculant-aluminum polysilicate by means of polymerization on hydrolysate silicate in chlorosilane raffinate, hydrochloric acid and aluminum oxide in red mud. As reaction raw materials are taken from industrial wastes, the production cost is correspondingly lowered, and as aluminum ion residue in wastewater is far less than that in conventional polymeric aluminum, the method is of higher using safety.
Description
Technical field
The invention belongs to environmental chemistry and water treatment field, relate to the preparation method of a class inorganic polymer flocculant.
Background technology
Can produce a large amount of not solidifying tail gas and raffinate in the polysilicon production process, the main component of these tail gas and raffinate is SiCl
4And contain SiH
2Cl
2, SiHCl
3The by products such as chlorosilane raffinate.Present treatment process mainly is to utilize caustic soda, lime slurry neutralization, and flocculation sediment filtration etc. cause a large amount of caustic soda, lime waste, and can produce a large amount of residues after processing, and can produce again new solid waste and pile up.
Red mud is the alkaline pollution waste residue of alumina producing enterprise discharging, 1 ton of aluminum oxide of general every production, 0.7～1.8 ton of red mud of subsidiary generation.China is as the world the 4th large alumina producing state, and the red mud of annual discharging is up to millions of tons.Contain the effective constituents such as a large amount of aluminium, iron in the red mud, yet red mud mainly relies on large-area accumulation and effective constituent is not used adequately reasonably at present, has so not only caused environmental pollution, has also caused a large amount of wastes of resource.
It is nontoxic, efficient, easy to use that polysilicate has, thereby be used widely in water treatment.How to utilize two kinds of effective constituents in the trade waste to produce inorganic polymer flocculant-aluminium silicate polymer, the treatment of wastes with processes of wastes against one another is relevant enterprise one of problem demanding prompt solution in the environmental improvement process always.
Summary of the invention
Purpose of the present invention: utilize the raffinate of polysilicon production process generation and the waste red mud of alumina producing to be raw material, produce the inorganic polymer flocculant aluminium silicate polymer that can be used for sewage disposal.
Know-why of the present invention is mainly SiCl
4+ 2H
2O=SiO
2+ 4HCl, reaction product hydrochloric acid can dissolve the effective constituent SiO in the red mud
2, Al
2O
3, CaO etc., and under certain lysate condition, can aggregate into high-efficiency sewage flocculation agent aluminium silicate polymer.
Advantage of the present invention is that the raw materials for production of aluminium silicate polymer all take from industrial waste, and when resource was rationally reclaimed, production cost is corresponding reduction also.In addition, compare with traditional sewage flocculant polymerize aluminum chloride, its aluminium composition that residues in the water is much smaller, therefore possess higher safety in utilization.
A kind of method specific implementation method of utilizing polysilicon raffinate and red mud to prepare aluminium silicate polymer of the present invention is as follows:
1) processing of polysilicon raffinate
The production of polysilicon raffinate is joined in the closed reactor of belt stirrer and hydrogen chloride gas absorption unit, add lentamente pure water under the condition that stirs, adding speed is unlikely too acutely as degree take speed of response.Wherein the ratio that adds of polysilicon raffinate and water is mol ratio 1:2 ~ 1:10, and the reaction that is hydrolyzed under the low rate mixing condition can be considered reaction and finishes when temperature of reaction no longer raises, continue to stir, and is cooled to room temperature.Solution for standby is taken out in centrifugation.
2) preparation of polymer aluminium silicate
Get respectively that the red mud of solution and certain mass joins in the reactor of belt stirrer successively after the above-mentioned reaction, stirred lower heating reflux reaction 2 ~ 6 hours.With the suspension liquid centrifugation, the reject residue.With centrifugate polyreaction 2 ~ 8 hours under 70 ~ 90 ℃ of heating conditions, at last that liquid evaporation is dry, grind, sieve, namely obtain the aluminium silicate polymer powder-product.
Description of drawings
Accompanying drawing is the polymer aluminium silicate production technological process.
Embodiment
Embodiment 1: the production of polymer aluminium silicate
Production of polysilicon raffinate 500 grams are joined in the airtight there-necked flask of 2000mL of belt stirrer and hydrogen chloride gas absorption unit, start agitator and add lentamente pure water 500 grams, adding speed is unlikely too acutely as degree take speed of response.The reaction that is hydrolyzed under the low rate mixing condition, reaction are stirred when continuing to produce without hydrogen chloride gas and are finished, and leave standstill and are cooled to room temperature.Solution for standby is taken out in centrifugation.
Get respectively after the above-mentioned reaction solution 200mL and dried red mud 50 grams and join successively in the 500mL there-necked flask of belt stirrer, stirred lower heating reflux reaction 2 hours.With the suspension liquid centrifugation, the reject residue.
Above-mentioned centrifugate is joined in 500mL and the there-necked flask with stirring and reflux cooling device, and polyreaction finished after 4 hours under 80 ℃ of heating conditions.At last that liquid evaporation is dry, grind, cross 500 mesh sieves and namely obtain the aluminium silicate polymer powder-product.
Embodiment 2: simulated sewage is processed experiment
The said products is used water dissolution at normal temperatures, be mixed with the flocculating experiment that 3% solution carries out Simulated Water, Simulated Water is the suspension liquid of kaolin configuration 5%.When the working concentration of polymer aluminium silicate is 5 ~ 10mg/L, pH is 6 ~ 9 o'clock, the turbidity rate of descent of simulated sewage 〉=90%.
Claims (3)
1. one kind is utilized the raffinate of production of polysilicon and the method that red mud prepares aluminium silicate polymer, it is characterized in that carrying out as follows:
1) the production of polysilicon raffinate is joined in the closed reactor of belt stirrer and hydrogen chloride gas absorption unit, start agitator and add lentamente pure water, adding speed is unlikely too acutely as degree take speed of response; The reaction that under the low rate mixing condition, is hydrolyzed, reaction finishes when temperature of reaction no longer raises, and continues to stir, and is cooled to room temperature; Solution for standby is taken out in centrifugation;
2) get respectively 1) red mud of solution and certain mass joins in the reaction unit of belt stirrer successively after the reaction, stirs down heating reflux reaction 2 ~ 6 hours; With the suspension liquid centrifugation, the reject residue; With centrifugate polyreaction 2 ~ 8 hours under 70 ~ 90 ℃ of heating conditions, at last that liquid evaporation is dry, grind, sieve, namely obtain the polymer aluminium silicate powder-product.
2. a kind of method of utilizing polysilicon raffinate and red mud to prepare aluminium silicate polymer according to claim 1, the ratio that adds that it is characterized in that polysilicon raffinate and water is mol ratio 1:4 ~ 1:10.
3. a kind of method of utilizing polysilicon raffinate and red mud to prepare aluminium silicate polymer according to claim 1 is characterized in that the aluminium silicate polymer that makes is crossed grit number after grinding be 200～2000 orders.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201310259203 CN103318994A (en) | 2013-06-27 | 2013-06-27 | Method for preparing aluminum polysilicate by using polycrystalline silicon production raffinate and red mud |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201310259203 CN103318994A (en) | 2013-06-27 | 2013-06-27 | Method for preparing aluminum polysilicate by using polycrystalline silicon production raffinate and red mud |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103318994A true CN103318994A (en) | 2013-09-25 |
Family
ID=49188095
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201310259203 Pending CN103318994A (en) | 2013-06-27 | 2013-06-27 | Method for preparing aluminum polysilicate by using polycrystalline silicon production raffinate and red mud |
Country Status (1)
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|---|---|
| CN (1) | CN103318994A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109796022A (en) * | 2019-04-01 | 2019-05-24 | 四川广阳环保科技有限公司 | A method of poly aluminium iron silicate is produced using chlorosilane raffinate, aluminum dross and acid sludge |
-
2013
- 2013-06-27 CN CN 201310259203 patent/CN103318994A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109796022A (en) * | 2019-04-01 | 2019-05-24 | 四川广阳环保科技有限公司 | A method of poly aluminium iron silicate is produced using chlorosilane raffinate, aluminum dross and acid sludge |
| CN109796022B (en) * | 2019-04-01 | 2020-09-29 | 四川广阳环保科技有限公司 | Method for producing poly-aluminum ferric silicate by using chlorosilane residual liquid, waste aluminum slag and acid sludge |
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Application publication date: 20130925 |