CN115677192A - Treatment method of low-energy-consumption glass toughening waste molten salt - Google Patents
Treatment method of low-energy-consumption glass toughening waste molten salt Download PDFInfo
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- CN115677192A CN115677192A CN202110853496.7A CN202110853496A CN115677192A CN 115677192 A CN115677192 A CN 115677192A CN 202110853496 A CN202110853496 A CN 202110853496A CN 115677192 A CN115677192 A CN 115677192A
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- Prior art keywords
- potassium nitrate
- molten salt
- nitrate
- sodium nitrate
- dissolving tank
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- 239000011521 glass Substances 0.000 title claims abstract description 30
- 239000002699 waste material Substances 0.000 title claims abstract description 30
- 150000003839 salts Chemical class 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000005265 energy consumption Methods 0.000 title claims abstract description 11
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 claims abstract description 88
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 claims abstract description 80
- 235000010333 potassium nitrate Nutrition 0.000 claims abstract description 44
- 239000004323 potassium nitrate Substances 0.000 claims abstract description 44
- 235000010344 sodium nitrate Nutrition 0.000 claims abstract description 40
- 239000004317 sodium nitrate Substances 0.000 claims abstract description 40
- 239000000243 solution Substances 0.000 claims abstract description 21
- 239000000203 mixture Substances 0.000 claims abstract description 20
- 239000012047 saturated solution Substances 0.000 claims abstract description 20
- 238000001816 cooling Methods 0.000 claims abstract description 14
- 239000007788 liquid Substances 0.000 claims abstract description 14
- 238000000926 separation method Methods 0.000 claims abstract description 14
- 238000007670 refining Methods 0.000 claims abstract description 12
- 239000000706 filtrate Substances 0.000 claims abstract description 11
- 238000001914 filtration Methods 0.000 claims abstract description 10
- 238000004064 recycling Methods 0.000 claims abstract description 8
- 239000012452 mother liquor Substances 0.000 claims abstract description 7
- 239000007787 solid Substances 0.000 claims abstract description 7
- 230000001502 supplementing effect Effects 0.000 claims abstract description 7
- 238000003756 stirring Methods 0.000 claims description 6
- 239000012043 crude product Substances 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 claims description 2
- 238000005496 tempering Methods 0.000 abstract description 16
- 238000002425 crystallisation Methods 0.000 abstract description 9
- 230000008025 crystallization Effects 0.000 abstract description 8
- 239000006060 molten glass Substances 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 description 6
- 239000000047 product Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000001704 evaporation Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a method for treating low-energy-consumption waste molten glass for glass tempering, which comprises the following steps: 1) Adding a saturated solution of a mixture of potassium nitrate and sodium nitrate at 30 ℃ and waste glass toughening molten salt into a dissolving tank, wherein the potassium nitrate content of the waste glass toughening molten salt is less than or equal to 50%, the weight ratio of the potassium nitrate to the waste glass toughening molten salt is 5.0-1.0 to 2.0, controlling the temperature of the solution in the dissolving tank to Be 50 ℃, carrying out hot filtration on the upper-layer solution when the baume degree of the solution reaches 54 +/-0.5 Be, supplementing a saturated solution of a mixture of potassium nitrate and sodium nitrate at 30 ℃ with the same volume, and repeating the steps; 2) Adding the filtrate subjected to the heat filtration in the step 1) into a crystallizing tank, cooling to 30 ℃, cooling for crystallization, performing solid-liquid separation to obtain crude potassium nitrate, refining, and returning the mother liquor to the dissolving tank for recycling; 3) And (2) when the content of the solid sodium nitrate in the dissolving tank in the step 1) is more than 95%, performing solid-liquid separation to obtain crude sodium nitrate, and refining. The invention has the advantages of low energy consumption and simple process.
Description
Technical Field
The invention relates to an inorganic chemical technology, in particular to a method for treating low-energy-consumption glass tempering waste molten salt.
Background
The waste molten glass toughening salt is a solid waste produced by toughening glass by glass toughening enterprises, and the main components of the waste molten glass toughening salt are potassium nitrate and sodium nitrate. Generally, the content of potassium nitrate in the glass tempering waste molten salt generated by primary pressurized tempering furnace water is 30% -50%, the content of potassium nitrate in the glass tempering waste molten salt generated by secondary pressurized tempering furnace water is 80% -90%, the glass tempering waste molten salt generated by secondary pressurized tempering furnace water can be directly recycled by refining and extracting potassium nitrate, and part of sodium nitrate needs to be separated before refining and extracting potassium nitrate due to low content of potassium nitrate in the glass tempering waste molten salt generated by primary pressurized tempering furnace water. At present, the sodium nitrate is separated mainly by adopting a concentration, evaporation and crystallization method for recycling, and the method has the disadvantages of high energy consumption, high cost and complex process.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a simple method for treating the low-energy-consumption glass tempering waste molten salt.
The invention adopts the following technical scheme.
A method for treating low-energy-consumption glass tempering waste molten salt comprises the following steps:
1) Adding a saturated solution of a mixture of potassium nitrate and sodium nitrate at 30 ℃ into a dissolving tank, heating to 50 ℃ under stirring, simultaneously slowly adding the crushed waste glass tempering molten salt, wherein the content of potassium nitrate in the waste glass tempering molten salt is less than or equal to 50%, the weight ratio of the saturated solution of the mixture of potassium nitrate and sodium nitrate to the waste glass tempering molten salt is 5.0-2.0, controlling the temperature of the solution in the dissolving tank to Be 50 ℃, carrying out hot filtration on the upper-layer solution when the baume degree of the solution reaches 54 +/-0.5 Be, supplementing the saturated solution of the mixture of potassium nitrate and sodium nitrate at 30 ℃ with the same volume into the dissolving tank, and repeating the steps;
2) Adding the filtrate subjected to the hot filtration in the step 1) into a crystallizing tank, cooling the crystallizing tank to 30 ℃, cooling and crystallizing, performing solid-liquid separation to obtain crude potassium nitrate, refining by a potassium nitrate refining process, and returning mother liquor to the dissolving tank for recycling;
3) And (2) when the content of the solid sodium nitrate in the dissolving tank in the step 1) is more than 95%, performing solid-liquid separation to obtain crude sodium nitrate, and refining by a sodium nitrate refining process.
Compared with the prior art, the invention has the advantages of low energy consumption, low production cost, simple process, environmental protection, and the control parameters of temperature and baume degree in the whole production process, thereby reducing the testing cost and time, improving the production efficiency and shortening the production period of products.
Detailed Description
The present invention will be described in further detail with reference to examples.
Example 1
1) Adding a saturated solution of a mixture of potassium nitrate and sodium nitrate at 30 ℃ into a dissolving tank, slowly adding crushed waste glass toughening molten salt under stirring, controlling the weight ratio of the saturated solution of the mixture of potassium nitrate and sodium nitrate to the waste glass toughening molten salt with the potassium nitrate content of 50% to Be 5.0, controlling the solution temperature to Be 50 ℃, carrying out hot filtration on the upper-layer solution when the baume degree of the solution reaches 54 +/-0.5 Be, carrying out crystallization on the filtrate in the crystallizing tank, supplementing the saturated solution of the mixture of potassium nitrate and sodium nitrate at 30 ℃ with the same volume in the dissolving tank, and repeating the steps;
2) Cooling the hot filtered filtrate obtained in the step 1) to 30 ℃ in a crystallizing tank, cooling and crystallizing, performing solid-liquid separation to obtain the crude potassium nitrate with the content of 69.4%, and returning the mother liquor to the dissolving tank for recycling;
3) And (3) detecting the content of insoluble solid sodium nitrate in the dissolving tank to be more than 95%, and then carrying out solid-liquid separation to obtain a crude product sodium nitrate with the content of 95.3%.
Example 2
1) Adding a saturated solution of a mixture of potassium nitrate and sodium nitrate at 30 ℃ into a dissolving tank, slowly adding broken glass toughening waste molten salt under stirring, wherein the weight ratio of the saturated solution of the mixture of potassium nitrate and sodium nitrate to the glass toughening waste molten salt with the potassium nitrate content of 40% is 5.0.5, controlling the solution temperature at 50 ℃, carrying out hot filtration on an upper-layer solution when the baume degree of the solution reaches 54 +/-0.5 Be, carrying out crystallization of a filtrate in the crystallizing tank, supplementing the saturated solution of the mixture of potassium nitrate and sodium nitrate at 30 ℃ with the same volume in the dissolving tank, and repeating the steps;
2) Cooling the hot filtered filtrate obtained in the step 1) to 30 ℃ in a crystallizing tank for cooling crystallization, performing solid-liquid separation to obtain a crude potassium nitrate product with the content of 69.1%, and returning the mother liquor to the dissolving tank for recycling;
3) And (3) detecting the content of insoluble solid sodium nitrate in the dissolving tank to be more than 95%, and then carrying out solid-liquid separation to obtain crude sodium nitrate with the content of 95.8%.
Example 3
1) Adding a saturated solution of a mixture of potassium nitrate and sodium nitrate at 30 ℃ into a dissolving tank, slowly adding crushed waste glass toughening molten salt under stirring, controlling the weight ratio of the saturated solution of the mixture of potassium nitrate and sodium nitrate to the waste glass toughening molten salt with the potassium nitrate content of 35% to Be 5.0, controlling the solution temperature to Be 50 ℃, carrying out hot filtration on the upper-layer solution when the baume degree of the solution reaches 54 +/-0.5 Be, carrying out crystallization on the filtrate in the crystallizing tank, supplementing the saturated solution of the mixture of potassium nitrate and sodium nitrate at 30 ℃ with the same volume in the dissolving tank, and repeating the steps;
2) Cooling the hot filtered filtrate obtained in the step 1) to 30 ℃ in a crystallizing tank for cooling crystallization, performing solid-liquid separation to obtain a crude potassium nitrate product with the content of 67.6%, and returning the mother liquor to the dissolving tank for recycling;
3) And (3) detecting the content of insoluble solid sodium nitrate in the dissolving tank to be more than 95%, and then carrying out solid-liquid separation to obtain crude sodium nitrate with the content of 96.3%.
Example 4
1) Adding a saturated solution of a mixture of potassium nitrate and sodium nitrate at 30 ℃ into a dissolving tank, slowly adding broken glass toughening waste molten salt under stirring, wherein the weight ratio of the saturated solution of the mixture of potassium nitrate and sodium nitrate to the glass toughening waste molten salt with the potassium nitrate content of 30% is 5.0.2.0, controlling the solution temperature at 50 ℃, carrying out hot filtration on the upper-layer solution when the baume degree of the solution reaches 54 +/-0.5 Be, carrying out crystallization on the filtrate in the crystallizing tank, supplementing the saturated solution of the mixture of potassium nitrate and sodium nitrate at 30 ℃ with the same volume in the dissolving tank, and repeating the steps;
2) Cooling the hot filtered filtrate obtained in the step 1) to 30 ℃ in a crystallizing tank for cooling crystallization, performing solid-liquid separation to obtain 68.5% of crude potassium nitrate, and returning the mother liquor to the dissolving tank for recycling;
3) And (3) detecting that the content of insoluble solid sodium nitrate in the dissolving tank is more than 95 percent, and performing solid-liquid separation to obtain crude sodium nitrate with the content of 96.5 percent.
As can be seen from examples 1-4, the invention has the advantages of simple production process, easy control, no need of evaporating a large amount of water solvent, low energy consumption, green and environment-friendly process, stable product quality and low production cost.
The refined products of the crude potassium nitrate and the crude sodium nitrate produced by the method can meet or exceed the quality requirements of superior products according to national standard detection.
Claims (1)
1. The method for treating the low-energy-consumption glass toughening waste molten salt is characterized by comprising the following steps of:
1) Adding a saturated solution of a mixture of potassium nitrate and sodium nitrate at 30 ℃ into a dissolving tank, heating to 50 ℃ while stirring, simultaneously slowly adding the crushed waste glass toughening molten salt, wherein the potassium nitrate content of the waste glass toughening molten salt is less than or equal to 50%, the weight ratio of the saturated solution of the mixture of potassium nitrate and sodium nitrate to the waste glass toughening molten salt is 5.0 to 1.0 to 2.0, controlling the temperature of the solution in the dissolving tank to Be 50 ℃, carrying out hot filtration on the upper-layer solution when the baume degree of the solution reaches 54 +/-0.5 Be, and supplementing the saturated solution of the mixture of potassium nitrate and sodium nitrate at 30 ℃ with the same volume into the dissolving tank, and repeating the steps;
2) Adding the filtrate subjected to the hot filtration in the step 1) into a crystallizing tank, cooling the crystallizing tank to 30 ℃, cooling and crystallizing, performing solid-liquid separation to obtain crude potassium nitrate, refining by a potassium nitrate refining process, and returning mother liquor to the dissolving tank for recycling;
3) And (3) when the content of the solid sodium nitrate in the dissolving tank in the step 1) is more than 95%, carrying out solid-liquid separation to obtain a crude product sodium nitrate, and refining by a sodium nitrate refining process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110853496.7A CN115677192A (en) | 2021-07-28 | 2021-07-28 | Treatment method of low-energy-consumption glass toughening waste molten salt |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110853496.7A CN115677192A (en) | 2021-07-28 | 2021-07-28 | Treatment method of low-energy-consumption glass toughening waste molten salt |
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| Publication Number | Publication Date |
|---|---|
| CN115677192A true CN115677192A (en) | 2023-02-03 |
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| CN202110853496.7A Pending CN115677192A (en) | 2021-07-28 | 2021-07-28 | Treatment method of low-energy-consumption glass toughening waste molten salt |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116715451A (en) * | 2023-06-02 | 2023-09-08 | 河南曲显光电科技有限公司 | Method for reutilizing scrapped potassium nitrate, lithium-containing glass and strengthening method thereof |
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2021
- 2021-07-28 CN CN202110853496.7A patent/CN115677192A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116715451A (en) * | 2023-06-02 | 2023-09-08 | 河南曲显光电科技有限公司 | Method for reutilizing scrapped potassium nitrate, lithium-containing glass and strengthening method thereof |
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