CN105110346A - Filtering refining technology for liquid-state sodium silicate - Google Patents
Filtering refining technology for liquid-state sodium silicate Download PDFInfo
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- CN105110346A CN105110346A CN201510523009.5A CN201510523009A CN105110346A CN 105110346 A CN105110346 A CN 105110346A CN 201510523009 A CN201510523009 A CN 201510523009A CN 105110346 A CN105110346 A CN 105110346A
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Abstract
The invention belongs to the technical field of sodium silicate production, and particularly relates to a filtering refining technology for liquid-state sodium silicate. The technology comprises the following steps that 1, a flocculating agent is added in crude liquid-state sodium silicate at 80-95 DEG C, then the mixture is stirred for 30-60 minutes and stood for 10-15 hours, and flocculation liquid is obtained; 2, filtering aid is added in the flocculation liquid, and filtering is performed with a filtering device; 3, during filtering, when the internal and external pressure difference of the filtering device is larger than 0.2 MPa, the pressure at a filtering liquid outlet is increased, the internal and external pressure difference of the filtering device is maintained to be smaller than 0.2 MPa during filtering until filtering is finished, and then clear sodium silicate liquid and filter residues are obtained. According to the filtering refining technology for the liquid-state sodium silicate, the product purity and quality are improved, the filtering amount and filtering speed are effectively increased, the filtering cycle is prolonged, the production efficiency is improved to the utmost extent, the manufacturing cost is lowered, and benefits are brought to enterprises.
Description
Technical field
The invention belongs to water glass production technical field, particularly relate to a kind of liquid sodium silicate and filter process for refining.
Background technology
Water glass develops product the most widely in inorganic silicon compound, as a kind of basic inorganic industrial chemicals, is used for producing the various silicates products such as white carbon black, zeolite molecular sieve, silica gel, silicon sol, Starso; Being indispensable raw material in the washing composition such as washing powder, soap in light industry, is also water softener, settling agent; For helping dye, bleaching and sizing in textile industry; Casting, emery wheel manufacture and anticolodal etc. are widely used in machinery industry; For the manufacture of rapid hardening cement, acid-proof cement, dubbin, soil-solidified-agent, refractory materials etc. in building trade; Agriculturally can manufacture silicon element fertilizer material; As tackiness agent, be widely used in the manufactures such as cardboard (fluting board) carton, welding rod, coating.
Liquid sodium silicate is produced and is comprised reaction and filter two large operations, and wherein the filtration of liquid sodium silicate is even more important, and the precision of filtration and speed determine quality and the production capacity of product.Existing filtration process is conventional filtration technique, and filter plant generally adopts 120-200 order filtering accuracy strainer or pressure filter, and filtration velocity generally remains on 0.2-0.5 cubic meter/hour, and filter filtration yield is 10-20 cube/time.
Existing liquid sodium silicate filtration process mainly has the following disadvantages:
(1) filtering accuracy is inadequate, with insoluble silicate small molecular weight impurities such as iron, aluminium, calcium, magnesium in product, reduces the purity of product and affects downstream client use.
(2) because liquid sodium silicate has high concentration high viscosity, cause filtration velocity slow, filtration cycle is short, greatly affects production production capacity, improves production cost.
Summary of the invention
The object of the invention is to be: the deficiency existed for prior art, provides a kind of filtering accuracy high, and filtration velocity is fast, can shorten filtration cycle, and the liquid sodium silicate improving product purity filters process for refining.
For solving the problems of the technologies described above, technical scheme of the present invention is:
A kind of liquid sodium silicate filters process for refining, and described technique comprises the following steps:
(1) at 80-95 DEG C of temperature, in liquid sodium silicate crude product, add flocculation agent, stir 30-60 minute, leave standstill 10-15 hour, obtain flocculation liquid;
(2) in described flocculation liquid, add flocculating aids, device filters after filtration;
(3) when filtering, when the inside and outside differential pressure of filtration unit is greater than 0.2MPa, increase the pressure at filtrate outlet place, when keeping filtering, the inside and outside differential pressure of described filtration unit is less than 0.2MPa, terminates, obtain water glass clear liquid and filter residue until filter.
Improve as one, described technique also comprises: (4) add flocculating aids in described filter residue, again enters filtration unit and filters.
Improve as one, in step (1), described flocculation agent is polyacrylamide flocculation agent.
Improve as one, in step (1), the add-on of described flocculation agent is the 0.2-0.5 ‰ of described liquid sodium silicate crude product weight.
Improve as one, in step (1), described stirring is airflow stirring.
Improve as one, in step (2), the weight of described flocculating aids is the 0.2-2% of described flocculation liquid weight.
Improve as one, in step (2), described flocculating aids is the mixture of diatomite and gac, and the weight ratio of described diatomite and gac is 2:1.
Improve as one, in step (2), when adding described flocculating aids in described flocculation liquid, first described for part flocculating aids is coated in advance the surface of described flocculation liquid, after 10-20 minute, then by remaining described flocculating aids and the blending of described flocculation liquid.
Owing to have employed technique scheme, the invention has the beneficial effects as follows:
The use of flocculation agent makes the insoluble silicates such as iron in liquid, aluminium, calcium, magnesium flocculate into macromolecular particle by small molecules, after leaching, reduces foreign matter content, improves the purity of product.
The use in-depth of flocculating aids and the cake layer that loosened, reduce filtration resistance, improve filtering rate, and absorbed portion pigment and small molecular weight impurity, effectively extend filtration cycle, improve and stable filtering accuracy.
Supercharging extends filtration cycle, improves the effect of filtration yield.
Technique provided by the invention improves product purity and quality, effectively raises filtration yield and filtration velocity, extends filtration cycle, improve production efficiency largely, reduce manufacturing cost, bring benefit to enterprise.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Embodiment one
A kind of liquid sodium silicate filters process for refining, and described technique comprises the following steps:
(1) at 80-95 DEG C of temperature, in liquid sodium silicate crude product, add flocculation agent, airflow stirring 30 minutes, leave standstill 15 hours, obtain flocculation liquid;
(2) at 80-95 DEG C of temperature, in flocculation liquid, add flocculating aids, the add-on of flocculation agent is 0.2 ‰ of liquid sodium silicate crude product weight, and device filters after filtration;
(3) when filtering, when the inside and outside differential pressure of filtration unit is greater than 0.2MPa, one topping-up pump can be set at the liquid outlet place of filtration unit, thus increase the pressure at filtrate outlet place, thus the inside and outside differential pressure of filtration unit is less than 0.2MPa all the time when keeping filtering, terminate until filter, obtain water glass clear liquid and filter residue.
Embodiment two
A kind of liquid sodium silicate filters process for refining, and described technique comprises the following steps:
(1) at 80-95 DEG C of temperature, in liquid sodium silicate crude product, add flocculation agent, airflow stirring 40 minutes, leave standstill 14 hours, obtain flocculation liquid;
(2) at 80-95 DEG C of temperature, in flocculation liquid, add flocculating aids, the add-on of flocculation agent is 0.5 ‰ of liquid sodium silicate crude product weight, and device filters after filtration;
(3) when filtering, when the inside and outside differential pressure of filtration unit is greater than 0.2MPa, one topping-up pump can be set at the liquid outlet place of filtration unit, thus increase the pressure at filtrate outlet place, thus the inside and outside differential pressure of filtration unit is less than 0.2MPa all the time when keeping filtering, terminate until filter, obtain water glass clear liquid and filter residue.
Embodiment three
A kind of liquid sodium silicate filters process for refining, and described technique comprises the following steps:
(1) at 80-95 DEG C of temperature, in liquid sodium silicate crude product, add flocculation agent, airflow stirring 50 minutes, leave standstill 13 hours, obtain flocculation liquid;
(2) at 80-95 DEG C of temperature, flocculating aids is added in flocculation liquid, the add-on of flocculation agent is 0.7 ‰ of liquid sodium silicate crude product weight, when adding flocculating aids in flocculation liquid, first a part of flocculating aids is coated in advance the surface of flocculation liquid, after 10 minutes, then by remaining flocculating aids and the blending of described flocculation liquid, device filters after filtration;
(3) when filtering, when the inside and outside differential pressure of filtration unit is greater than 0.2MPa, one topping-up pump can be set at the liquid outlet place of filtration unit, thus increase the pressure at filtrate outlet place, thus the inside and outside differential pressure of filtration unit is less than 0.2MPa all the time when keeping filtering, terminate until filter, obtain water glass clear liquid and filter residue.
Embodiment four
A kind of liquid sodium silicate filters process for refining, and described technique comprises the following steps:
(1) at 80-95 DEG C of temperature, in liquid sodium silicate crude product, add flocculation agent, airflow stirring 60 minutes, leave standstill 10 hours, obtain flocculation liquid;
(2) at 80-95 DEG C of temperature, flocculating aids is added in flocculation liquid, the add-on of flocculation agent is 1.0 ‰ of liquid sodium silicate crude product weight, when adding flocculating aids in flocculation liquid, first a part of flocculating aids is coated in advance the surface of flocculation liquid, after 15 minutes, then by remaining flocculating aids and the blending of described flocculation liquid, device filters after filtration;
(3) when filtering, when the inside and outside differential pressure of filtration unit is greater than 0.2MPa, one topping-up pump can be set at the liquid outlet place of filtration unit, thus increase the pressure at filtrate outlet place, thus the inside and outside differential pressure of filtration unit is less than 0.2MPa all the time when keeping filtering, terminate until filter, obtain water glass clear liquid and filter residue.
Embodiment five
A kind of liquid sodium silicate filters process for refining, and described technique comprises the following steps:
(1) at 80-95 DEG C of temperature, in liquid sodium silicate crude product, add flocculation agent, airflow stirring 45 minutes, leave standstill 12 hours, obtain flocculation liquid;
(2) at 80-95 DEG C of temperature, flocculating aids is added in flocculation liquid, the add-on of flocculation agent is 1.5 ‰ of liquid sodium silicate crude product weight, when adding flocculating aids in flocculation liquid, first a part of flocculating aids is coated in advance the surface of flocculation liquid, after 20 minutes, then by remaining flocculating aids and the blending of described flocculation liquid, device filters after filtration;
(3) when filtering, when the inside and outside differential pressure of filtration unit is greater than 0.2MPa, one topping-up pump can be set at the liquid outlet place of filtration unit, thus increase the pressure at filtrate outlet place, thus the inside and outside differential pressure of filtration unit is less than 0.2MPa all the time when keeping filtering, terminate until filter, obtain water glass clear liquid and filter residue.
Embodiment six
A kind of liquid sodium silicate filters process for refining, and described technique comprises the following steps:
(1) at 80-95 DEG C of temperature, in liquid sodium silicate crude product, add flocculation agent, airflow stirring 45 minutes, leave standstill 12 hours, obtain flocculation liquid;
(2) at 80-95 DEG C of temperature, flocculating aids is added in flocculation liquid, the add-on of flocculation agent is 1.5 ‰ of liquid sodium silicate crude product weight, when adding flocculating aids in flocculation liquid, first a part of flocculating aids is coated in advance the surface of flocculation liquid, after 20 minutes, then by remaining flocculating aids and the blending of described flocculation liquid, device filters after filtration;
(3) when filtering, when the inside and outside differential pressure of filtration unit is greater than 0.2MPa, one topping-up pump can be set at the liquid outlet place of filtration unit, thus increase the pressure at filtrate outlet place, thus the inside and outside differential pressure of filtration unit is less than 0.2MPa all the time when keeping filtering, terminate until filter, obtain water glass clear liquid and filter residue;
(4) in filter residue, add flocculating aids, again enter filtration unit and filter, the operation of repeating step (3) during filtration.
Flocculation agent in above-described embodiment is preferably polyacrylamide flocculation agent; Flocculating aids is preferably the mixture of diatomite and gac, and the weight ratio of diatomite and gac is 2:1.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. liquid sodium silicate filters a process for refining, and it is characterized in that, described technique comprises the following steps:
(1) at 80-95 DEG C of temperature, in liquid sodium silicate crude product, add flocculation agent, stir 30-60 minute, leave standstill 10-15 hour, obtain flocculation liquid;
(2) in described flocculation liquid, add flocculating aids, device filters after filtration;
(3) when filtering, when the inside and outside differential pressure of filtration unit is greater than 0.2MPa, increase the pressure at filtrate outlet place, when keeping filtering, the inside and outside differential pressure of described filtration unit is less than 0.2MPa, terminates, obtain water glass clear liquid and filter residue until filter.
2. liquid sodium silicate as claimed in claim 1 filters process for refining, and it is characterized in that, described technique also comprises: (4) add flocculating aids in described filter residue, again enters filtration unit and filters.
3. liquid sodium silicate as claimed in claim 1 filters process for refining, and it is characterized in that, in step (1), described flocculation agent is polyacrylamide flocculation agent.
4. liquid sodium silicate as claimed in claim 1 filters process for refining, and it is characterized in that, in step (1), the add-on of described flocculation agent is the 0.2-0.5 ‰ of described liquid sodium silicate crude product weight.
5. liquid sodium silicate as claimed in claim 1 filters process for refining, and it is characterized in that, in step (1), described stirring is airflow stirring.
6. liquid sodium silicate as claimed in claim 1 filters process for refining, and it is characterized in that, in step (2), the weight of described flocculating aids is the 0.2-2% of described flocculation liquid weight.
7. liquid sodium silicate as claimed in claim 1 filters process for refining, and it is characterized in that, in step (2), described flocculating aids is the mixture of diatomite and gac, and the weight ratio of described diatomite and gac is 2:1.
8. liquid sodium silicate as claimed in claim 1 filters process for refining, it is characterized in that, in step (2), when adding described flocculating aids in described flocculation liquid, first described for part flocculating aids is coated in advance the surface of described flocculation liquid, after 10-20 minute, then by remaining described flocculating aids and the blending of described flocculation liquid.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106219563A (en) * | 2016-07-31 | 2016-12-14 | 福建师范大学泉港石化研究院 | A kind of waterglass deferrization refining method |
| CN107934979A (en) * | 2017-12-06 | 2018-04-20 | 安徽凤阳赛吉元无机材料有限公司 | A kind of filtration treatment method of water glass solution |
| CN110937608A (en) * | 2019-12-30 | 2020-03-31 | 安徽龙泉硅材料有限公司 | Preparation method of high-quality sodium silicate for silicon dioxide |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62256721A (en) * | 1986-04-28 | 1987-11-09 | Mizusawa Ind Chem Ltd | Refining method for impurity-containing alkali silicate |
| CN1084491A (en) * | 1992-09-25 | 1994-03-30 | 中国石油化工总公司兰州炼油化工总厂 | The pressure and filter aid filtration process for refining of water glass |
| CN202542877U (en) * | 2012-02-29 | 2012-11-21 | 福建省三明巨丰化工有限公司 | Flocculant filtering-assisted water glass device |
| CN103332699A (en) * | 2013-06-13 | 2013-10-02 | 福建远翔化工有限公司 | Sodium silicate de-ironing method |
| CN103818915A (en) * | 2014-03-10 | 2014-05-28 | 福建正盛无机材料股份有限公司 | Method for preparing high-transparency liquid soluble silicate |
-
2015
- 2015-08-24 CN CN201510523009.5A patent/CN105110346A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62256721A (en) * | 1986-04-28 | 1987-11-09 | Mizusawa Ind Chem Ltd | Refining method for impurity-containing alkali silicate |
| CN1084491A (en) * | 1992-09-25 | 1994-03-30 | 中国石油化工总公司兰州炼油化工总厂 | The pressure and filter aid filtration process for refining of water glass |
| CN202542877U (en) * | 2012-02-29 | 2012-11-21 | 福建省三明巨丰化工有限公司 | Flocculant filtering-assisted water glass device |
| CN103332699A (en) * | 2013-06-13 | 2013-10-02 | 福建远翔化工有限公司 | Sodium silicate de-ironing method |
| CN103818915A (en) * | 2014-03-10 | 2014-05-28 | 福建正盛无机材料股份有限公司 | Method for preparing high-transparency liquid soluble silicate |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106219563A (en) * | 2016-07-31 | 2016-12-14 | 福建师范大学泉港石化研究院 | A kind of waterglass deferrization refining method |
| CN107934979A (en) * | 2017-12-06 | 2018-04-20 | 安徽凤阳赛吉元无机材料有限公司 | A kind of filtration treatment method of water glass solution |
| CN110937608A (en) * | 2019-12-30 | 2020-03-31 | 安徽龙泉硅材料有限公司 | Preparation method of high-quality sodium silicate for silicon dioxide |
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Application publication date: 20151202 |