CN103601199A - Method for preparing silica sol by using waste mortar produced by cutting wafers - Google Patents
Method for preparing silica sol by using waste mortar produced by cutting wafers Download PDFInfo
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- CN103601199A CN103601199A CN201310478249.9A CN201310478249A CN103601199A CN 103601199 A CN103601199 A CN 103601199A CN 201310478249 A CN201310478249 A CN 201310478249A CN 103601199 A CN103601199 A CN 103601199A
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Abstract
The invention relates to a method for preparing a silica sol by using waste mortar produced by cutting wafers. The method comprises the steps of firstly filtering by using a plate and frame filter; then separating silica micropowder by using a hydrocyclone; then pumping the silica micropowder into a reaction kettle; stirring; heating; adding a mixed solution containing 20% of sodium silicate as an alkaline catalyst; heating and reacting at a constant temperature; filtering and adding activated carbon; heating and decoloring to obtain a silica sol finished product. With the method, silicone in the waste mortar produced by cutting the wafers can be effectively recycled and used for preparing the silica sol; and in a preparation process of the silica sol, conversion rate of silicone is increased by preparation of the alkaline catalyst, thereby facilitating reduction of production cost.
Description
Technical field
The present invention relates to a kind of waste mortar that utilizes cutting silicon wafer and prepare the method for silicon sol.
Background technology
At present, traditional silicon sol preparation method adopts 200 objects to control gold silicon powder, reacts generate the silicon-dioxide aqueous solution, i.e. silicon sol under basic catalyst catalysis with water.The silica flour per pass conversion of this method is no more than 80%, and prepares silicon sol after the silicon bits in the waste mortar of cutting silicon wafer will being extracted, and the raising of its transformation efficiency especially has practical significance.
Summary of the invention
The object of this invention is to provide silicon in the waste mortar that makes cutting silicon wafer can fully be reclaimed, and a kind of waste mortar that utilizes cutting silicon wafer that makes that silicon has a high conversion is prepared the method for silicon sol.
The technical scheme that the present invention takes is: a kind of waste mortar that utilizes cutting silicon wafer is prepared the method for silicon sol, it is characterized in that it comprises the following steps: A, in waste mortar, adds appropriate water, after agitation and dilution heating, squeeze into plate-and-frame filter press and filter, isolated solid is filter cake one; B, filter cake one is added after appropriate water agitation and dilution, again squeeze into plate-and-frame filter press and filter, isolated solid is filter cake two; C, filter cake two is added after appropriate water agitation and dilution, squeeze in the hydrocyclone of some series connection and carry out stage trapping; D, the isolated material of the overflow port from hydrocyclone is squeezed into plate-and-frame filter press filter, isolated solid is silicon powder and a small amount of silicon carbide micro-powder; E, above-mentioned silicon powder is added and squeezes into reactor after proper amount of clear water and stir, heat to 60 ℃, add basic catalyst, be then warming up to 80～90 ℃ and carry out isothermal reaction, after reacting completely, blowing is cooled to 40 ℃; F, above-mentioned reacted material is squeezed into plate-and-frame filter press filter, filtrate is wherein thick silicon sol; G, thick silicon sol is heated after decolouring through adding gac, then carry out after plate-and-frame filter press filtration, separation obtains solution and is silicon sol finished product.
Described a kind of waste mortar that utilizes cutting silicon wafer is prepared the method for silicon sol, it is characterized in that basic catalyst is the mixed solution that contains 20% water glass, its preparation technology filters step F the solid of gained, add after appropriate water agitation and dilution, add sodium hydroxide solution to react, and reacted material is squeezed into plate-and-frame filter press and filter, filtrate is wherein basic catalyst.
Adopt the present invention, can and be used by the silicon efficient recovery in the waste mortar of cutting silicon wafer that it prepares silicon sol, and in making silicon sol process, by the preparation of basic catalyst, improve the transformation efficiency of silicon, be conducive to reduce production costs.
Embodiment
Below in conjunction with specific embodiment, invention is described further.It comprises the steps:
One, in waste mortar, add appropriate water, after agitation and dilution heating, squeeze into plate-and-frame filter press and filter, isolated solid is filter cake one;
Two, filter cake one is added after appropriate water agitation and dilution, again squeeze into plate-and-frame filter press and filter, isolated solid is filter cake two;
Three, filter cake two is added after appropriate water agitation and dilution, squeeze in the hydrocyclone of some series connection and carry out stage trapping;
Four, the isolated liquid of the overflow port from hydrocyclone is squeezed into plate-and-frame filter press and filter, isolated solid is silicon powder;
Five, above-mentioned silicon powder is added and squeezes into reactor after clear water and stir, heat to 60 ℃ in the ratio of 1 ︰ 6, add solution that mass percent concentration is 20% at 4% water glass content as basic catalyst, then be warming up to 80～90 ℃ and carry out isothermal reaction, after reacting completely, blowing is cooled to 40 ℃;
Six, above-mentioned reacted material is squeezed into plate-and-frame filter press and filter, filtrate is wherein thick silicon sol; Solid is wherein silicon carbide micro-powder and unreacted silicon powder completely, according to test result, by 10 parts of silicon powders, add the sodium hydroxide of 97 parts of water and 13 parts to react therein, reacted material is squeezed into plate-and-frame filter press to be filtered, filtrate is wherein 100 parts of the water glass of 20% content, is basic catalyst.
Seven, thick silicon sol is heated after decolouring through adding gac, then carry out after plate-and-frame filter press filtration, separation obtains solution and is silicon sol finished product.
Claims (2)
1. utilize the waste mortar of cutting silicon wafer to prepare a method for silicon sol, it is characterized in that it comprises the following steps: A, in waste mortar, adds appropriate water, after agitation and dilution heating, squeeze into plate-and-frame filter press and filter, isolated solid is filter cake one; B, filter cake one is added after appropriate water agitation and dilution, again squeeze into plate-and-frame filter press and filter, isolated solid is filter cake two; C, filter cake two is added after appropriate water agitation and dilution, squeeze in the hydrocyclone of some series connection and carry out stage trapping; D, the isolated material of the overflow port from hydrocyclone is squeezed into plate-and-frame filter press filter, isolated solid is silicon powder and a small amount of silicon carbide micro-powder; E, above-mentioned silicon powder is added and squeezes into reactor after proper amount of clear water and stir, heat to 60 ℃, add basic catalyst, be then warming up to 80～90 ℃ and carry out isothermal reaction, after reacting completely, blowing is cooled to 40 ℃; F, above-mentioned reacted material is squeezed into plate-and-frame filter press filter, filtrate is wherein thick silicon sol; G, thick silicon sol is heated after decolouring through adding gac, then carry out after plate-and-frame filter press filtration, separation obtains solution and is silicon sol finished product.
2. a kind of waste mortar that utilizes cutting silicon wafer according to claim 1 is prepared the method for silicon sol, it is characterized in that basic catalyst is the mixed solution that contains 20% water glass, its preparation technology filters step F the solid of gained, add after appropriate water agitation and dilution, add sodium hydroxide solution to react, and reacted material is squeezed into plate-and-frame filter press and filter, filtrate is wherein basic catalyst.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310478249.9A CN103601199A (en) | 2013-10-14 | 2013-10-14 | Method for preparing silica sol by using waste mortar produced by cutting wafers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310478249.9A CN103601199A (en) | 2013-10-14 | 2013-10-14 | Method for preparing silica sol by using waste mortar produced by cutting wafers |
Publications (1)
| Publication Number | Publication Date |
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| CN103601199A true CN103601199A (en) | 2014-02-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310478249.9A Pending CN103601199A (en) | 2013-10-14 | 2013-10-14 | Method for preparing silica sol by using waste mortar produced by cutting wafers |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108046269A (en) * | 2018-01-16 | 2018-05-18 | 常州大学 | A kind of technique of the useless powder separation and recovery of solar silicon wafers cutting |
| CN109319795A (en) * | 2018-10-18 | 2019-02-12 | 江西星火狮达科技有限公司 | The method of recycling purification silicon powder production silica solution from organosilicon slag |
| CN112624127A (en) * | 2021-01-13 | 2021-04-09 | 湖州圆津材料科技有限公司 | Preparation system and process of silica sol |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3650977A (en) * | 1969-03-27 | 1972-03-21 | Philadelphia Quartz Co | Method of preparing silica sol and product thereof |
| CN102515180A (en) * | 2011-12-14 | 2012-06-27 | 江苏佳宇资源利用股份有限公司 | Method for preparing large particle size silica sol and superfine silicon carbide using tailings in waste mortar |
| CN102746935A (en) * | 2012-08-02 | 2012-10-24 | 无锡和荣科技有限公司 | Method for recycling silicon cutting waste mortar |
| CN102911779A (en) * | 2012-11-01 | 2013-02-06 | 浙江晶盛硅晶材料有限公司 | Solid-liquid separation process through plate-frame pressure filtration in cutting fluid recovery |
-
2013
- 2013-10-14 CN CN201310478249.9A patent/CN103601199A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3650977A (en) * | 1969-03-27 | 1972-03-21 | Philadelphia Quartz Co | Method of preparing silica sol and product thereof |
| CN102515180A (en) * | 2011-12-14 | 2012-06-27 | 江苏佳宇资源利用股份有限公司 | Method for preparing large particle size silica sol and superfine silicon carbide using tailings in waste mortar |
| CN102746935A (en) * | 2012-08-02 | 2012-10-24 | 无锡和荣科技有限公司 | Method for recycling silicon cutting waste mortar |
| CN102911779A (en) * | 2012-11-01 | 2013-02-06 | 浙江晶盛硅晶材料有限公司 | Solid-liquid separation process through plate-frame pressure filtration in cutting fluid recovery |
Non-Patent Citations (1)
| Title |
|---|
| 仝宇等: "硅切割废砂浆制备粗孔块状硅胶的工艺研究", 《无机盐工业》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108046269A (en) * | 2018-01-16 | 2018-05-18 | 常州大学 | A kind of technique of the useless powder separation and recovery of solar silicon wafers cutting |
| CN109319795A (en) * | 2018-10-18 | 2019-02-12 | 江西星火狮达科技有限公司 | The method of recycling purification silicon powder production silica solution from organosilicon slag |
| CN109319795B (en) * | 2018-10-18 | 2020-07-31 | 江西星火狮达科技有限公司 | Method for producing silica sol by recovering and purifying silicon powder from organic silicon slag |
| CN112624127A (en) * | 2021-01-13 | 2021-04-09 | 湖州圆津材料科技有限公司 | Preparation system and process of silica sol |
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Application publication date: 20140226 |