CN107601434A - A kind of method and apparatus that hydrogen fluoride is prepared by fluosilicic acid - Google Patents
A kind of method and apparatus that hydrogen fluoride is prepared by fluosilicic acid Download PDFInfo
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- CN107601434A CN107601434A CN201711082739.1A CN201711082739A CN107601434A CN 107601434 A CN107601434 A CN 107601434A CN 201711082739 A CN201711082739 A CN 201711082739A CN 107601434 A CN107601434 A CN 107601434A
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Abstract
The present invention proposes a kind of method and apparatus that hydrogen fluoride is prepared by fluosilicic acid, and method includes：Dense fluosilicic acid and the concentrated sulfuric acid are mixed, the mixed gas and dilute sulfuric acid of ocratation and hydrogen fluoride are obtained after reaction；By washing, condensation；The silicon tetrafluoride gas is passed through in dilute fluosilicic acid, obtains silica solid and dense fluosilicic acid clear liquid.Equipment includes：Decomposing pot, scrubbing tower, condenser, absorption kettle and the separator being sequentially communicated.Caused material uses as raw material again in step of the present invention, has saved cost, while reduces postprocessing working procedures, improves production efficiency, is easy to the scale application of factory.The present invention utilizes the absorption function of the concentrated sulfuric acid, fluosilicic acid is decomposed into hydrogen fluoride and silicon tetrafluoride gas so that fluosilicic acid is utilized effectively.The present invention is concentrated by dilute sulfuric acid, again as the concentrated sulfuric acid, reduces the discharge of dilute sulfuric acid so that sulfuric acid turns into intermediate, and fluosilicic acid is decomposed into hydrogen fluoride and silica.
Description
Technical field
The present invention relates to hydrogen fluoride technical field, particularly relates to a kind of method and apparatus that hydrogen fluoride is prepared by fluosilicic acid.
Background technology
During with calcirm-fluoride and gas washing in SA production hydrogen fluoride, due to containing silica, silica in calcirm-fluoride
Ocratation is generated with hydrogen fluoride reaction, ocratation is absorbed together with water and a small amount of hydrofluoric acid, makes fluosilicic acid by-product
Product.Because the market dosage of fluosilicic acid in recent years is drastically shunk, fluosilicic acid becomes at needs environmental protection from salable byproduct
The spent acid of reason；Add the cost of manufacturing enterprise.
In view of this, it is necessary to research and develop a kind of technique for handling fluosilicic acid, digest unnecessary fluosilicic acid, produce other tools
There is the product of economic value.
The content of the invention
The present invention proposes a kind of method and apparatus that hydrogen fluoride is prepared by fluosilicic acid, solves fluosilicic acid mistake in the prior art
The problem of amount.
The technical proposal of the invention is realized in this way：
A kind of method that hydrogen fluoride is prepared by fluosilicic acid, including：
(1) dense fluosilicic acid and the concentrated sulfuric acid are mixed, the mixed gas of ocratation and hydrogen fluoride and dilute sulphur are obtained after reaction
Acid；
(2) mixed gas of the ocratation and hydrogen fluoride is washed by the concentrated sulfuric acid, obtains liquid by condensation afterwards
Hydrogen fluoride and silicon tetrafluoride gas；Sulfuric acid after washing is used in step (1)；
(3) silicon tetrafluoride gas in the step (2) is passed through in dilute fluosilicic acid, is obtained dense fluosilicic acid and silica and is sunk
Form sediment；Separation of solid and liquid, and precipitation of silica is cleaned, obtain silica solid and dense fluosilicic acid clear liquid；The dense fluosilicic acid clear liquid
For in step (1).
As preferable technical scheme, caused dilute sulfuric acid after being reacted in the step (1), it is concentrated to give by high temperature dense
Sulfuric acid and waste water of the degree more than or equal to 92%；Sulfuric acid content in the waste water is not more than 3%；The high temperature is 180 DEG C -338
℃。
As preferable technical scheme, the liquid-fluorination hydrogen in the step (2) obtains anhydrous hydrogen fluoride product after refining；
Or water hydrofluoric acid is obtained after being mixed with water.
As preferable technical scheme, the dilute sulfuric acid in the step (1) is delivered to reacts production phosphate fertilizer or phosphorus with ground phosphate rock
The production line of acid.
As preferable technical scheme, the concentration of dense fluosilicic acid is 30%~60% in the step (1).
As preferable technical scheme, the concentration of dilute fluosilicic acid in the step (3) is 12%~36%.The present invention's
Principle is as follows：
Dense fluosilicic acid releases the mixed gas of ocratation and hydrogen fluoride in the presence of the concentrated sulfuric acid absorbs water by force after dehydration：
H2SiF6+H2SO4(dense) → 2HF+SiF4+H2SO4(dilute)
Silicon tetrafluoride gas is passed through raw material fluosilicic acid (relatively dilute fluosilicic acid), reacts generation fluosilicic acid with water therein
And silica so that the concentration of raw material fluosilicic acid gets a promotion, and turns into dense fluosilicic acid：
3SiF4+2H2O→2H2SiF6+SiO2
Part water is sloughed after dilute sulfuric acid heating, turns into the concentrated sulfuric acid：
H2SO4(dilute) → H2SO4(dense)+2H2O
A kind of equipment that hydrogen fluoride is prepared by fluosilicic acid, including：
Decomposing pot, scrubbing tower, condenser, absorption kettle and the equipment for separating liquid from solid being sequentially communicated；
The decomposing pot be used for decompose fluosilicic acid, it include the import of the concentrated sulfuric acid first, dense fluosilicic acid import, ocratation and
It is fluorinated hydrogen mixed gas first outlet and dilute sulfuric acid outlet；
The scrubbing tower is used to absorb ocratation and is fluorinated the moisture carried secretly in hydrogen mixed gas, and it includes the concentrated sulfuric acid the
Two imports, ocratation and fluorination hydrogen mixed gas first import, ocratation and fluorination hydrogen mixed gas second outlet and
Concentrated sulfuric acid first outlet；The concentrated sulfuric acid first outlet and the inlet communication of the concentrated sulfuric acid first, for dense fluorine silicon in decomposing pot
The decomposition of acid；
The condenser is used to hydrogen fluoride gas be condensed into liquid, is allowed to separate with silicon tetrafluoride gas, it includes four
Silicon fluoride and fluorination hydrogen mixed gas second import, liquid-fluorination hydrogen outlet and silicon tetrafluoride gas outlet；The tetrafluoride
Silicon and the fluorination import of hydrogen mixed gas second are connected with ocratation and fluorination hydrogen mixed gas second outlet；The liquid-fluorination
Hydrogen outlet is connected with wet tank；
The absorption kettle is used for dilute fluosilicic acid and absorbs silicon tetrafluoride gas so that dilute fluosilicic acid turns into dense fluosilicic acid and simultaneously
Separate out silica；It includes dilute fluosilicic acid import, silicon tetrafluoride gas import and dense fluosilicic acid and silica solid goes out
Mouthful；
The equipment for separating liquid from solid is used to separate dense fluosilicic acid and silica；It includes dense fluosilicic acid and silica and consolidated
Body import, the outlet of dense fluosilicic acid, cleaning fluid import, rinse liquid outlet and silica outlet；The dense fluosilicic acid and dioxy
SiClx solids inlet is connected with dense fluosilicic acid and silica solid outlet, the dense fluosilicic acid outlet and dense fluosilicic acid import phase
Even.
As preferable technical scheme, in addition to concentration tower, the concentration tower includes dilute sulfuric acid import, the concentrated sulfuric acid second goes out
Mouth and wastewater outlet；The dilute sulfuric acid import and the dilute sulfuric acid outlet；The concentrated sulfuric acid second outlet and the dense sulphur
Sour second inlet communication.
Beneficial effect
(1) present invention utilizes the absorption function of the concentrated sulfuric acid, and fluosilicic acid is decomposed into hydrogen fluoride and silicon tetrafluoride gas so that
Fluosilicic acid is utilized effectively；
(2) present invention concentrated by dilute sulfuric acid, again as the concentrated sulfuric acid, reduce the discharge of dilute sulfuric acid so that sulfuric acid into
For intermediate, fluosilicic acid is decomposed into hydrogen fluoride and silica.
(3) when dilute sulfuric acid has and subsequently uses place to go, dilute sulfuric acid is directly delivered to subsequent handling by the present invention, saves dilute sulphur
The energy consumption of acid concentration, as ground phosphate rock reacts the production line of production phosphate fertilizer or phosphoric acid.
(4) fluorination hydrogen production produced by the invention is twice laid, and cost is cheap, while is easy to the scale application of factory
With.
(5) while hydrogen fluoride is made in method of the invention, silica byproduct is also obtained, can go out as finished product
Sell, increase economic value.
(6) process route of the invention is discharged without waste residue, without waste gas, only a small amount of sulfur acid waste water, process and calcium oxide
Reaction, can generate calcium sulfate precipitation, waste water can qualified discharge, calcium sulfate can be used for engineering construction etc..
Brief description of the drawings
, below will be to embodiment in order to illustrate more clearly of embodiment of the present invention or technical scheme of the prior art
Or the required accompanying drawing used is briefly described in description of the prior art, it should be apparent that, drawings in the following description are only
It is some embodiments of the present invention, for those of ordinary skill in the art, is not paying the premise of creative labor
Under, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is a kind of structural representation of equipment that hydrogen fluoride is prepared by fluosilicic acid of the present embodiment 1.
Fig. 2 is a kind of process chart of method that hydrogen fluoride is prepared by fluosilicic acid of this implementation column 2.
Wherein：Decomposing pot 11, scrubbing tower 12, condenser 13, absorption kettle 14, equipment for separating liquid from solid 15, concentration tower 16, liquid
Storage tank 17, heat energy supply equipment 18, the first import of the concentrated sulfuric acid 111, dense fluosilicic acid import 112, dilute sulfuric acid outlet 113, tetrafluoride
Silicon and fluorination hydrogen mixed gas first outlet 114, the second import of the concentrated sulfuric acid 121, ocratation and fluorination hydrogen mixed gas first
Import 122, ocratation and fluorination hydrogen mixed gas second outlet 123, concentrated sulfuric acid first outlet 124, ocratation and fluorination
The second import of hydrogen mixed gas 131, liquid-fluorination hydrogen outlet 132, silicon tetrafluoride gas outlet 133, dilute fluosilicic acid import 141,
Silicon tetrafluoride gas import 142, dense fluosilicic acid and silica solid outlet 143, dense fluosilicic acid and silica solid import
151st, dense fluosilicic acid outlet 152, cleaning fluid import 153, rinse liquid outlet 154, silica outlet 155, dilute sulfuric acid import
161st, concentrated sulfuric acid second outlet 162, wastewater outlet 163.
Embodiment
The technical scheme in the embodiment of the present invention will be clearly and completely described below, it is clear that described implementation
Example only part of the embodiment of the present invention, rather than whole embodiments.It is common based on the embodiment in the present invention, this area
The every other embodiment that technical staff is obtained under the premise of creative work is not made, belong to the model that the present invention protects
Enclose.
The material used in following embodiments is commercially available.
Embodiment 1
As shown in Figure 1：A kind of equipment that hydrogen fluoride is prepared by fluosilicic acid, including decomposing pot 11, scrubbing tower 12, condenser
13rd, absorption kettle 14 and equipment for separating liquid from solid 15.Wherein decomposing pot 11, scrubbing tower 12, condenser 13, absorption kettle 14, separation dress
15 are put to be sequentially communicated by pipeline.The decomposing pot 11 is used to decompose fluosilicic acid, and it includes the first import of the concentrated sulfuric acid 111, dense fluorine silicon
Sour import 112, dilute sulfuric acid outlet 113 and ocratation and fluorination hydrogen mixed gas first outlet 114.Scrubbing tower 12 is used for
Absorb ocratation and be fluorinated the moisture carried secretly in hydrogen mixed gas, it includes the second import of the concentrated sulfuric acid 121, ocratation and fluorine
Change the first import of hydrogen mixed gas 122, ocratation and fluorination hydrogen mixed gas second outlet 123 and concentrated sulfuric acid first outlet
124.The concentrated sulfuric acid first outlet 124 connects with the first import of the concentrated sulfuric acid 111, the decomposition for dense fluosilicic acid in decomposing pot.
Circulation route is formed between scrubbing tower 12 and decomposing pot 11.Condenser 13 is used to hydrogen fluoride gas be condensed into liquid, is allowed to
Separated with silicon tetrafluoride gas, it includes ocratation and the second import of fluorination hydrogen mixed gas 131, the outlet of liquid-fluorination hydrogen
132 and silicon tetrafluoride gas outlet 133.Ocratation and the second import of fluorination hydrogen mixed gas 131, ocratation and fluorination
Hydrogen mixed gas second outlet 133 is connected.Liquid-fluorination hydrogen outlet 132 is connected with wet tank 17.Come out by condenser 13
Liquid-fluorination storing hydrogen it is standby in wet tank 17.Absorption kettle 14 is used for dilute fluosilicic acid and absorbs silicon tetrafluoride gas so that
Dilute fluosilicic acid turns into dense fluosilicic acid and separates out silica simultaneously；It includes dilute fluosilicic acid import 141, silicon tetrafluoride gas import
142 and dense fluosilicic acid and silica solid outlet 143.Equipment for separating liquid from solid 15 is used to separate dense fluosilicic acid and titanium dioxide
Silicon；It includes dense fluosilicic acid and silica solid import 151, dense fluosilicic acid exports 152, cleaning fluid import 153, cleaning fluid goes out
Mouth 154 and silica outlet 155.Dense fluosilicic acid and silica solid import 151 is consolidated with dense fluosilicic acid and silica
Body outlet 143 is connected, and dense fluosilicic acid outlet 152 is connected with dense fluosilicic acid import 112.Above-mentioned decomposing pot 11, scrubbing tower 12, condensation
Device 13, absorption kettle 14, separator 15 form closure pipeline.
In order to more effectively utilize material, also include concentration tower 16 in the embodiment, for reacted dilute sulfuric acid is dense
The concentrated sulfuric acid is condensed to be continuing with.The concentration tower 16 includes dilute sulfuric acid import 161, concentrated sulfuric acid second outlet 162 and wastewater outlet
163.Dilute sulfuric acid import 161 connects with the dilute sulfuric acid outlet 113 of decomposing pot 11；Concentrated sulfuric acid second outlet 162 and decomposing pot 11
The first import of the concentrated sulfuric acid 111 connects.And heated up by heat energy supply equipment 18 to concentration tower 16.Come out by wastewater outlet 163
A small amount of sulfur acid waste water and calcium oxide reaction, generate calcium sulfate precipitation, waste water can qualified discharge, calcium sulfate can be used for engineering
Building etc..
Embodiment 2
Prepared using the equipment in embodiment 1, comprising the following steps that for hydrogen fluoride is prepared by raw material of fluosilicic acid：
The concentrated sulfuric acid of 1000kg30% fluosilicic acid and 1750kg98% is passed through decomposing pot 11, the hybrid reaction at 90 DEG C,
Caused gas is passed through scrubbing tower 12, absorbs ocratation with the concentrated sulfuric acid and is fluorinated the moisture carried secretly in hydrogen mixed gas, afterwards
Into condenser 13, condensed liquid-fluorination hydrogen is passed through wet tank 17.The concentrated sulfuric acid in scrubbing tower 12 continues on for decomposing
In kettle 11.
Uncooled gas is passed through in the absorption kettle 14 for having 1000kg30% fluosilicic acid, then reactant is passed through into separation dress
15 are put, and cleans precipitation of silica, obtains silica 41.7kg, 42.5% fluosilicic acid 1175kg.The fluosilicic acid continues
As raw material reuse.The silica can be used as product to take out.
2450kg dilute sulfuric acids in decomposing pot 11 are passed through concentration tower 16, reaction temperature is controlled at 205 DEG C, obtain 98% it is dense
Sulfuric acid 1746.4kg.The concentrated sulfuric acid is passed through in scrubbing tower 12.
Embodiment 3
Prepared using the equipment in embodiment 1, comprising the following steps that for hydrogen fluoride is prepared by raw material of fluosilicic acid：
The concentrated sulfuric acid of 1175kg42.5% fluosilicic acid and 1746.4kg98% is passed through decomposing pot 11, mixed at 90 DEG C anti-
Should, after caused gas is passed through scrubbing tower 12, condenser 13 successively, condensed liquid-fluorination hydrogen is by being refining to obtain
138.7kg anhydrous hydrogen fluoride.The concentrated sulfuric acid in scrubbing tower 12 continues on in decomposing pot 11.
Uncooled gas is passed through in the absorption kettle 14 for having 1000kg30% fluosilicic acid, then reactant is passed through into separation dress
15 are put, and cleans precipitation of silica, obtains silica 69.4kg, 49% fluosilicic acid 1291.4kg.The fluosilicic acid continues
As raw material reuse.The silica can be used as product to take out.
2422kg dilute sulfuric acids in decomposing pot 11 are passed through concentration tower 16, reaction temperature is controlled at 205 DEG C, obtain 98% it is dense
Sulfuric acid 1726.4kg.The concentrated sulfuric acid is passed through in scrubbing tower 12.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
God any modification, equivalent substitution and improvements made etc., should be included in the scope of the protection with principle.
Claims (8)
- A kind of 1. method that hydrogen fluoride is prepared by fluosilicic acid, it is characterised in that including：(1) dense fluosilicic acid and the concentrated sulfuric acid are mixed, the mixed gas and dilute sulfuric acid of ocratation and hydrogen fluoride are obtained after reaction；(2) mixed gas of the ocratation and hydrogen fluoride is washed by the concentrated sulfuric acid, obtains liquid-fluorination by condensation afterwards Hydrogen and silicon tetrafluoride gas；The concentrated sulfuric acid after washing is used in step (1)；(3) silicon tetrafluoride gas in the step (2) is passed through in dilute fluosilicic acid, obtains dense fluosilicic acid and precipitation of silica； Separation of solid and liquid, and precipitation of silica is cleaned, obtain silica solid and dense fluosilicic acid clear liquid；The dense fluosilicic acid clear liquid is used for In step (1).
- A kind of 2. method that hydrogen fluoride is prepared by fluosilicic acid according to claim 1, it is characterised in that the step (1) Caused dilute sulfuric acid after middle reaction, sulfuric acid and waste water of the concentration more than or equal to 92% are concentrated to give by high temperature；In the waste water Sulfuric acid content be not more than 3%；The high temperature is 180 DEG C -338 DEG C.
- A kind of 3. method that hydrogen fluoride is prepared by fluosilicic acid according to claim 1, it is characterised in that the step (2) In liquid-fluorination hydrogen it is refined after obtain anhydrous hydrogen fluoride product；Or water hydrofluoric acid is obtained after being mixed with water.
- A kind of 4. method that hydrogen fluoride is prepared by fluosilicic acid according to claim 1, it is characterised in that the step (1) In dilute sulfuric acid deliver to ground phosphate rock react production phosphate fertilizer or phosphoric acid production line.
- A kind of 5. method that hydrogen fluoride is prepared by fluosilicic acid according to claim 1, it is characterised in that the step (1) In dense fluosilicic acid concentration be 30%~60%.
- A kind of 6. method that hydrogen fluoride is prepared by fluosilicic acid according to claim 1, it is characterised in that the step (3) In dilute fluosilicic acid concentration be 12%~36%.
- A kind of 7. equipment that hydrogen fluoride is prepared by fluosilicic acid, it is characterised in that including：Decomposing pot, scrubbing tower, condenser, absorption kettle and the equipment for separating liquid from solid being sequentially communicated；The decomposing pot is used to decompose fluosilicic acid, and it includes the import of the concentrated sulfuric acid first, dense fluosilicic acid import, ocratation and fluorination Hydrogen mixed gas first outlet and dilute sulfuric acid outlet；The scrubbing tower is used to absorb ocratation and is fluorinated the moisture carried secretly in hydrogen mixed gas, and it includes the concentrated sulfuric acid second and entered Mouth, ocratation and the import of fluorination hydrogen mixed gas first, ocratation and fluorination hydrogen mixed gas second outlet and dense sulphur Sour first outlet；The concentrated sulfuric acid first outlet and the inlet communication of the concentrated sulfuric acid first, for dense fluosilicic acid in decomposing pot Decompose；The condenser is used to hydrogen fluoride gas be condensed into liquid, is allowed to separate with silicon tetrafluoride gas, it includes tetrafluoride Silicon and fluorination hydrogen mixed gas second import, liquid-fluorination hydrogen outlet and silicon tetrafluoride gas outlet；The ocratation and The fluorination import of hydrogen mixed gas second is connected with ocratation and fluorination hydrogen mixed gas second outlet；The liquid-fluorination hydrogen goes out Mouth is connected with wet tank；The absorption kettle is used for dilute fluosilicic acid and absorbs silicon tetrafluoride gas so that dilute fluosilicic acid turns into dense fluosilicic acid and separated out simultaneously Silica；It includes dilute fluosilicic acid import, silicon tetrafluoride gas import and dense fluosilicic acid and silica solid outlet；The equipment for separating liquid from solid is used to separate dense fluosilicic acid and silica；It includes dense fluosilicic acid and silica solid and entered Mouth, the outlet of dense fluosilicic acid, cleaning fluid import, rinse liquid outlet and silica outlet；The dense fluosilicic acid and silica Solids inlet is connected with dense fluosilicic acid and silica solid outlet, and the dense fluosilicic acid outlet is connected with dense fluosilicic acid import.
- 8. a kind of equipment that hydrogen fluoride is prepared by fluosilicic acid according to claim 7, it is characterised in that also include concentration Tower, the concentration tower include dilute sulfuric acid import, concentrated sulfuric acid second outlet and wastewater outlet；The dilute sulfuric acid import and dilute sulphur Sour outlet；The concentrated sulfuric acid second outlet and the inlet communication of the concentrated sulfuric acid second.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711082739.1A CN107601434A (en) | 2017-11-07 | 2017-11-07 | A kind of method and apparatus that hydrogen fluoride is prepared by fluosilicic acid |
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| CN201711082739.1A CN107601434A (en) | 2017-11-07 | 2017-11-07 | A kind of method and apparatus that hydrogen fluoride is prepared by fluosilicic acid |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110683514A (en) * | 2019-10-29 | 2020-01-14 | 贵州新东浩化工材料科技有限公司 | Method for purifying and preparing hydrogen fluoride |
| CN111153387A (en) * | 2020-03-03 | 2020-05-15 | 衢州市鼎盛化工科技有限公司 | Method and equipment for recovering fluorine-containing waste liquid of acid-washed coal |
| CN112158849A (en) * | 2020-09-27 | 2021-01-01 | 湖北祥云(集团)化工股份有限公司 | Method for preparing silicon tetrafluoride from phosphorus ore associated fluorine |
| CN112158850A (en) * | 2020-09-27 | 2021-01-01 | 湖北祥云(集团)化工股份有限公司 | Method for preparing anhydrous silicon tetrafluoride and hydrogen fluoride mixed gas by using phosphorus ore associated fluorine |
| CN112340703A (en) * | 2020-11-11 | 2021-02-09 | 四川大学 | Method for preparing anhydrous hydrogen fluoride and nano silicon dioxide by using fluosilicic acid |
| CN113042495A (en) * | 2021-02-08 | 2021-06-29 | 中船重工（邯郸）派瑞特种气体有限公司 | Treatment method and system of barium fluoride waste containing metal ions |
| CN113479845A (en) * | 2021-08-10 | 2021-10-08 | 福建省清流县东莹化工有限公司 | Process and device for preparing anhydrous hydrogen fluoride by recovery method |
| CN116425167A (en) * | 2023-04-19 | 2023-07-14 | 贵州瓮福蓝天氟化工股份有限公司 | Concentration method and system of fluosilicic acid solution |
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| CN207404837U (en) * | 2017-11-07 | 2018-05-25 | 衢州市鼎盛化工科技有限公司 | A kind of equipment that hydrogen fluoride is prepared by fluosilicic acid |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110683514A (en) * | 2019-10-29 | 2020-01-14 | 贵州新东浩化工材料科技有限公司 | Method for purifying and preparing hydrogen fluoride |
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| CN111153387A (en) * | 2020-03-03 | 2020-05-15 | 衢州市鼎盛化工科技有限公司 | Method and equipment for recovering fluorine-containing waste liquid of acid-washed coal |
| CN112158850A (en) * | 2020-09-27 | 2021-01-01 | 湖北祥云(集团)化工股份有限公司 | Method for preparing anhydrous silicon tetrafluoride and hydrogen fluoride mixed gas by using phosphorus ore associated fluorine |
| CN112158849A (en) * | 2020-09-27 | 2021-01-01 | 湖北祥云(集团)化工股份有限公司 | Method for preparing silicon tetrafluoride from phosphorus ore associated fluorine |
| CN112158849B (en) * | 2020-09-27 | 2023-06-30 | 湖北祥云(集团)化工股份有限公司 | Method for preparing silicon tetrafluoride by phosphorite accompanied with fluorine |
| CN112340703A (en) * | 2020-11-11 | 2021-02-09 | 四川大学 | Method for preparing anhydrous hydrogen fluoride and nano silicon dioxide by using fluosilicic acid |
| CN112340703B (en) * | 2020-11-11 | 2021-10-08 | 四川大学 | Method for preparing anhydrous hydrogen fluoride and nano silicon dioxide by using fluosilicic acid |
| CN113042495A (en) * | 2021-02-08 | 2021-06-29 | 中船重工（邯郸）派瑞特种气体有限公司 | Treatment method and system of barium fluoride waste containing metal ions |
| CN113042495B (en) * | 2021-02-08 | 2022-04-15 | 中船(邯郸)派瑞特种气体股份有限公司 | Treatment method and system of barium fluoride waste containing metal ions |
| CN113479845A (en) * | 2021-08-10 | 2021-10-08 | 福建省清流县东莹化工有限公司 | Process and device for preparing anhydrous hydrogen fluoride by recovery method |
| CN113479845B (en) * | 2021-08-10 | 2022-12-27 | 福建省清流县东莹化工有限公司 | Process and device for preparing anhydrous hydrogen fluoride by recovery method |
| CN116425167A (en) * | 2023-04-19 | 2023-07-14 | 贵州瓮福蓝天氟化工股份有限公司 | Concentration method and system of fluosilicic acid solution |
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