CN113247919A - Preparation method of silver potassium cyanide - Google Patents
Preparation method of silver potassium cyanide Download PDFInfo
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- CN113247919A CN113247919A CN202110557243.5A CN202110557243A CN113247919A CN 113247919 A CN113247919 A CN 113247919A CN 202110557243 A CN202110557243 A CN 202110557243A CN 113247919 A CN113247919 A CN 113247919A
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- Prior art keywords
- silver
- cyanide
- potassium
- potassium cyanide
- carbonate
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- HKSGQTYSSZOJOA-UHFFFAOYSA-N potassium argentocyanide Chemical compound [K+].[Ag+].N#[C-].N#[C-] HKSGQTYSSZOJOA-UHFFFAOYSA-N 0.000 title claims abstract description 87
- 238000002360 preparation method Methods 0.000 title abstract description 11
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(1+) nitrate Chemical compound [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 claims abstract description 50
- LKZMBDSASOBTPN-UHFFFAOYSA-L silver carbonate Substances [Ag].[O-]C([O-])=O LKZMBDSASOBTPN-UHFFFAOYSA-L 0.000 claims abstract description 35
- ZXSQEZNORDWBGZ-UHFFFAOYSA-N 1,3-dihydropyrrolo[2,3-b]pyridin-2-one Chemical compound C1=CN=C2NC(=O)CC2=C1 ZXSQEZNORDWBGZ-UHFFFAOYSA-N 0.000 claims abstract description 32
- 229910001958 silver carbonate Inorganic materials 0.000 claims abstract description 32
- 238000006243 chemical reaction Methods 0.000 claims abstract description 28
- NNFCIKHAZHQZJG-UHFFFAOYSA-N potassium cyanide Chemical compound [K+].N#[C-] NNFCIKHAZHQZJG-UHFFFAOYSA-N 0.000 claims abstract description 26
- UKHWJBVVWVYFEY-UHFFFAOYSA-M silver;hydroxide Chemical compound [OH-].[Ag+] UKHWJBVVWVYFEY-UHFFFAOYSA-M 0.000 claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000004519 manufacturing process Methods 0.000 claims abstract description 22
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims abstract description 20
- 229910001961 silver nitrate Inorganic materials 0.000 claims abstract description 19
- 229940098221 silver cyanide Drugs 0.000 claims abstract description 16
- LFAGQMCIGQNPJG-UHFFFAOYSA-N silver cyanide Chemical compound [Ag+].N#[C-] LFAGQMCIGQNPJG-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910002651 NO3 Inorganic materials 0.000 claims abstract description 10
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000002244 precipitate Substances 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 claims abstract description 6
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 claims description 30
- 239000007787 solid Substances 0.000 claims description 22
- 238000000034 method Methods 0.000 claims description 14
- 238000003756 stirring Methods 0.000 claims description 14
- 235000010333 potassium nitrate Nutrition 0.000 claims description 13
- 239000004323 potassium nitrate Substances 0.000 claims description 13
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 12
- 238000001035 drying Methods 0.000 claims description 12
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 9
- 238000001914 filtration Methods 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 8
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims description 8
- 238000000967 suction filtration Methods 0.000 claims description 8
- 239000013078 crystal Substances 0.000 claims description 7
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 6
- 238000005406 washing Methods 0.000 claims description 5
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 4
- 229910000027 potassium carbonate Inorganic materials 0.000 claims description 4
- TYJJADVDDVDEDZ-UHFFFAOYSA-M potassium hydrogencarbonate Chemical compound [K+].OC([O-])=O TYJJADVDDVDEDZ-UHFFFAOYSA-M 0.000 claims description 4
- 239000000047 product Substances 0.000 claims description 4
- 238000004090 dissolution Methods 0.000 claims description 3
- AYKOTYRPPUMHMT-UHFFFAOYSA-N silver;hydrate Chemical compound O.[Ag] AYKOTYRPPUMHMT-UHFFFAOYSA-N 0.000 claims description 3
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 3
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 claims description 2
- 229910000013 Ammonium bicarbonate Inorganic materials 0.000 claims description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 2
- 235000012538 ammonium bicarbonate Nutrition 0.000 claims description 2
- 239000001099 ammonium carbonate Substances 0.000 claims description 2
- 239000000908 ammonium hydroxide Substances 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims description 2
- 235000011181 potassium carbonates Nutrition 0.000 claims description 2
- 230000001376 precipitating effect Effects 0.000 claims description 2
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims description 2
- 235000017557 sodium bicarbonate Nutrition 0.000 claims description 2
- 235000017550 sodium carbonate Nutrition 0.000 claims description 2
- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 abstract description 11
- 239000000126 substance Substances 0.000 abstract description 6
- 239000002699 waste material Substances 0.000 abstract description 3
- 239000002253 acid Substances 0.000 abstract description 2
- 239000013064 chemical raw material Substances 0.000 abstract description 2
- 239000000243 solution Substances 0.000 description 42
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 description 8
- LELOWRISYMNNSU-UHFFFAOYSA-N hydrogen cyanide Chemical compound N#C LELOWRISYMNNSU-UHFFFAOYSA-N 0.000 description 4
- WIKQEUJFZPCFNJ-UHFFFAOYSA-N carbonic acid;silver Chemical compound [Ag].[Ag].OC(O)=O WIKQEUJFZPCFNJ-UHFFFAOYSA-N 0.000 description 3
- 238000004806 packaging method and process Methods 0.000 description 3
- KQTXIZHBFFWWFW-UHFFFAOYSA-L silver(I) carbonate Inorganic materials [Ag]OC(=O)O[Ag] KQTXIZHBFFWWFW-UHFFFAOYSA-L 0.000 description 3
- 239000000706 filtrate Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- NDVLTYZPCACLMA-UHFFFAOYSA-N silver oxide Chemical compound [O-2].[Ag+].[Ag+] NDVLTYZPCACLMA-UHFFFAOYSA-N 0.000 description 2
- 235000010344 sodium nitrate Nutrition 0.000 description 2
- 239000004317 sodium nitrate Substances 0.000 description 2
- 206010017740 Gas poisoning Diseases 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 238000003556 assay Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- KXZJHVJKXJLBKO-UHFFFAOYSA-N chembl1408157 Chemical compound N=1C2=CC=CC=C2C(C(=O)O)=CC=1C1=CC=C(O)C=C1 KXZJHVJKXJLBKO-UHFFFAOYSA-N 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012452 mother liquor Substances 0.000 description 1
- 150000002823 nitrates Chemical class 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 229910001923 silver oxide Inorganic materials 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
- C01C3/00—Cyanogen; Compounds thereof
- C01C3/08—Simple or complex cyanides of metals
- C01C3/11—Complex cyanides
Landscapes
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention provides a brand-new preparation method of silver potassium cyanide, which can recycle nitrate and is environment-friendly. The invention relates to a preparation method of silver potassium cyanide, which comprises the following steps: silver nitrate reacts with carbonate or hydroxide to produce silver carbonate or silver hydroxide, and the silver carbonate or silver hydroxide reacts with potassium cyanide to prepare potassium silver cyanide. The preparation method of the invention is characterized in that the production process of silver cyanide generated by the reaction of silver nitrate and cyanide is avoided in the production process of the silver potassium cyanide. Silver nitrate reacts with alkaline substances such as carbonate to generate silver carbonate precipitate (insoluble in water), and simultaneously, the generated nitrate and the water solution do not contain cyanide, so that the water solution can be concentrated to recover the nitrate to be used as a chemical raw material. Not only protects the environment and reduces the resource waste, but also eliminates the harm of harmful gas to human body when acid substances are contacted with potassium cyanide in the production process of the potassium silver cyanide.
Description
Technical Field
The invention relates to a preparation method of cyanide, and more particularly relates to a brand-new preparation method of silver potassium cyanide.
Background
The production method of the silver potassium cyanide has the production history and the application history for many years, and the silver cyanide is mainly generated by the reaction of silver nitrate and cyanide, and then the silver cyanide is reacted with potassium cyanide to generate the silver potassium cyanide. In this way, a certain amount of hydrogen cyanide gas is generated and released in the middle of the production of silver cyanide. There is a potential safety hazard of hydrogen cyanide gas poisoning. When silver nitrate reacts with sodium cyanide or potassium cyanide to produce potassium silver cyanide, a large amount of sodium nitrate or potassium nitrate is produced. Since these nitrates which can be utilized are mixed with cyanide, there is no way to utilize them even if they are recovered as being contaminated with cyanide. The reaction formula for the formation of silver cyanide is as follows:
AgNO3+2NaCN＝Ag(CN)2+NaNO3
AgNO3+2KCN＝Ag(CN)2+KNO3
in the actual production process, the sodium nitrate or potassium nitrate solution contained in the mother liquor after the silver potassium cyanide is extracted is discharged, which causes certain pollution to the environment.
Referring to chinese patents CN102874844A and CN1161935A, the above patents add alkaline substance during the process of making silver cyanide from silver nitrate during the process of producing potassium silver cyanide, neutralize the silver nitrate solution, add the neutralized silver nitrate solution into cyanide solution, wherein the generated nitrate is dissolved and dissolved in the aqueous solution of silver cyanide, stir the solution still, precipitate the silver cyanide crystals, these cyanide-containing nitrate solutions have no way to be recycled, and thus are discharged as waste with the waste water.
Disclosure of Invention
Aiming at the problems pointed out by the background technology, the invention provides a brand-new preparation method of silver potassium cyanide, which can recycle nitrate and is environment-friendly.
The invention relates to a preparation method of silver potassium cyanide, which comprises the following steps: silver nitrate reacts with carbonate or hydroxide to produce silver carbonate or silver hydroxide, and the silver carbonate or silver hydroxide reacts with potassium cyanide to prepare potassium silver cyanide.
Preferably, the carbonate is at least one of sodium carbonate, potassium carbonate, ammonium bicarbonate and sodium bicarbonate.
Preferably, the hydroxide is at least one of sodium hydroxide, potassium hydroxide and ammonium hydroxide.
Preferably, when silver carbonate is reacted with potassium cyanide to produce potassium silver cyanide, the following steps are included:
1. adding water into a reaction container according to the weight ratio of 1:0.5:5 of potassium cyanide, silver carbonate and water, heating to 60-90 ℃, adding potassium cyanide to complete dissolution, adding silver carbonate into the potassium cyanide solution under stirring, and completely dissolving the silver carbonate under stirring to generate a silver potassium cyanide solution;
2. concentrating the silver potassium cyanide solution completely reacted under negative pressure until crystals are separated out, and stopping concentrating;
3. cooling the concentrated solution to completely crystallize and precipitate the silver potassium cyanide, filtering to obtain a solid silver potassium cyanide, transferring the solid into a centrifugal machine to wash and remove carbonate to obtain a pure solid silver potassium cyanide, recovering the suction filtration solution, putting the recovered suction filtration solution into the next silver potassium cyanide reaction solution, and repeatedly using the solution after removing the carbonate;
4. and (3) drying, namely putting the silver potassium cyanide into a drying oven at the temperature of 95-100 ℃ to dry to obtain a pure silver potassium cyanide product.
Preferably, when silver hydroxide is reacted with potassium cyanide to produce potassium silver cyanide, the following steps are included:
1. adding water into a reaction kettle according to the weight ratio of 1:0.5:8 of potassium cyanide to silver hydroxide, heating to 60-90 ℃, adding potassium cyanide, stirring to dissolve, and adding silver hydroxide to completely dissolve the silver cyanide and the silver hydroxide to generate a silver potassium cyanide solution;
2. concentrating the silver potassium cyanide solution completely reacted under negative pressure until crystals are separated out, and stopping concentrating;
3. cooling the concentrated solution to completely crystallize and precipitate the silver potassium cyanide, filtering to obtain a solid silver potassium cyanide, transferring the solid into a centrifugal machine to wash and remove carbonate to obtain a pure solid silver potassium cyanide, recovering the suction filtration solution, putting the recovered suction filtration solution into the next silver potassium cyanide reaction solution, and repeatedly using the solution after removing the carbonate;
4. and (3) drying, namely putting the silver potassium cyanide into a drying oven at the temperature of 95-100 ℃ to dry to obtain a pure silver potassium cyanide product.
The preparation method of the invention is characterized in that the production process of silver cyanide generated by the reaction of silver nitrate and cyanide is avoided in the production process of the silver potassium cyanide. Silver nitrate reacts with alkaline substances such as carbonate to generate silver carbonate precipitate (insoluble in water), and simultaneously, the generated nitrate and the water solution do not contain cyanide, so that the water solution can be concentrated to recover the nitrate to be used as a chemical raw material. Not only protects the environment and reduces the resource waste, but also eliminates the harm of harmful gas to human body when acid substances are contacted with potassium cyanide in the production process of the potassium silver cyanide.
Detailed Description
The invention relates to a preparation method of silver potassium cyanide, which adopts silver nitrate to react with alkaline substances such as carbonate or hydroxide to generate silver carbonate or silver hydroxide, and then reacts with potassium cyanide to generate silver potassium cyanide, thereby completely changing the process of generating silver cyanide by using silver nitrate to react with cyanide when the silver potassium cyanide is produced in the past.
The reaction of silver carbonate or silver hydroxide may be exemplified by the following:
2AgNO3+Na2CO3＝2NaNO3+Ag2CO3↓
2AgNO3+K2CO3＝Ag2CO3↓+2KNO3
AgNO3+NaOH＝AgOH+NaNO3
AgNO3+KOH＝AgOH+KNO3
because the silver hydroxide is unstable, the silver hydroxide can be oxidized to generate silver oxide Ag in the air during storage or heat2O+H2O, it is preferable that the reaction for forming silver hydroxide and the reaction for forming silver potassium cyanide are continuously carried out without stopping.
The method for producing potassium silver cyanide according to the present invention will be described below with reference to specific examples.
EXAMPLE 1 silver Potassium cyanide production by silver carbonate Process
Production of silver carbonate and recovery of potassium nitrate
1. The production process of silver nitrate is similar to the well-known production method, and the specific process is not described.
2. The production of silver carbonate and the recovery method of potassium nitrate: putting 1000g of silver nitrate into a reaction vessel, adding water in a weight ratio of 1-5 times to completely dissolve the silver nitrate, heating to 70-85 ℃, slowly adding 20% potassium carbonate solution into the solution under stirring, and adjusting the pH value to be 7-10 to ensure that the generated silver carbonate (white) is completely crystallized and precipitated. And when the liquid is colorless and transparent, stopping adding the potassium carbonate solution, stopping stirring, completely precipitating the silver carbonate, filtering to obtain a silver carbonate solid and a potassium nitrate solution, washing the silver carbonate with clear water to dissolve nitrate, and collecting the washing water into a concentrated reaction vessel to be mixed with the potassium nitrate solution.
3. The potassium nitrate solution is transferred into a concentration reactor, a heater of the reaction vessel is opened, most of water is removed by concentration under the condition of negative pressure, and after the solution is saturated, the potassium nitrate is cooled to crystallize.
4. After the above-mentioned concentrated solution is cooled, it is filtered to obtain potassium nitrate solid, and then the potassium nitrate solid is passed through the processes of centrifugation, assay and packaging so as to obtain the potassium nitrate commodity, and the water removed by filtration can be recovered for reuse.
Production of potassium silver cyanide
The reaction is as follows:
Ag2CO3+4KCN＝2K[Ag(CN)2]+K2CO3
1. adding 5000ml of water into a reaction vessel according to the proportion of 1:0.5:5, heating to 60-90 ℃, adding 1000g of potassium cyanide to complete dissolution, adding 500g of silver carbonate into the potassium cyanide solution under stirring, and completely dissolving the silver carbonate under stirring to generate a silver potassium cyanide solution.
2. And (3) concentrating the completely reacted silver potassium cyanide solution under negative pressure until crystals are precipitated, and stopping concentrating.
3. Cooling the concentrated solution to make the silver potassium cyanide completely crystallize and precipitate, filtering to obtain solid silver potassium cyanide, transferring the solid into a centrifuge to wash and remove carbonate to obtain pure solid silver potassium cyanide, recovering the filtrate, placing the recovered filtrate into the next silver potassium cyanide reaction solution, and repeatedly using the solution after removing carbonate.
4. Drying, putting the silver potassium cyanide into a drying oven at 95-100 ℃ to dry to obtain pure silver potassium cyanide K [ Ag (CN)2]And testing and packaging the commodity.
EXAMPLE 2 silver Potassium cyanide production by silver hydroxide Process
The reaction is as follows:
AgOH+2KCN＝K[Ag(CN)2]+KOH
1. adding 8000ml of water into a reaction kettle according to the proportion of 1:0.5:8 of potassium cyanide, silver hydroxide and water, heating to 60-90 ℃, adding 1000g of potassium cyanide, stirring to dissolve, and adding 500g of silver hydroxide to completely dissolve the silver cyanide and the silver hydroxide to generate a silver potassium cyanide solution.
2. And (3) concentrating the completely reacted silver potassium cyanide solution under negative pressure until crystals are precipitated, and stopping concentrating.
3. Cooling the concentrated solution to make the silver potassium cyanide completely crystallize and precipitate, filtering to obtain solid silver potassium cyanide, washing the solid in a centrifuge to remove carbonate to obtain pure solid silver potassium cyanide, recovering the suction filtered solution, putting the recovered suction filtered solution into the next silver potassium cyanide reaction solution, and repeatedly using the solution after removing carbonate.
4. Drying, putting the silver potassium cyanide into a drying oven at 95-100 ℃ to dry to obtain pure silver potassium cyanide K [ Ag (CN)2]And testing and packaging the commodity.
While embodiments of the invention have been disclosed above, it is not limited to the applications listed in the description and the embodiments. It can be applied to all kinds of fields suitable for the present invention. Additional modifications will readily occur to those skilled in the art. It is therefore intended that the invention not be limited to the exact details and examples shown and described herein, but that the invention be limited only to the exact details and equivalents thereof, as defined by the appended claims and their equivalents.
Claims (7)
1. A method of preparing silver potassium cyanide, the method comprising: silver nitrate reacts with carbonate or hydroxide to produce silver carbonate or silver hydroxide, and the silver carbonate or silver hydroxide reacts with potassium cyanide to prepare potassium silver cyanide.
2. The method of producing silver potassium cyanide according to claim 1, wherein the carbonate is at least one of sodium carbonate, potassium carbonate, ammonium bicarbonate, and sodium bicarbonate.
3. The method for producing silver potassium cyanide according to claim 1, wherein the hydroxide is at least one of sodium hydroxide, potassium hydroxide, and ammonium hydroxide.
4. The method for producing potassium silver cyanide according to claim 1, wherein when silver carbonate is reacted with potassium cyanide to produce potassium silver cyanide, the method comprises the steps of:
a. adding water into a reaction container according to the weight ratio of 1:0.5:5 of potassium cyanide, silver carbonate and water, heating to 60-90 ℃, adding potassium cyanide to complete dissolution, adding silver carbonate into the potassium cyanide solution under stirring, and completely dissolving the silver carbonate under stirring to generate a silver potassium cyanide solution;
b. concentrating the silver potassium cyanide solution completely reacted under negative pressure until crystals are separated out, and stopping concentrating;
c. cooling the concentrated solution to completely crystallize and precipitate the silver potassium cyanide, filtering to obtain a solid silver potassium cyanide, transferring the solid into a centrifugal machine to wash and remove carbonate to obtain a pure solid silver potassium cyanide, recovering the suction filtration solution, putting the recovered suction filtration solution into the next silver potassium cyanide reaction solution, and repeatedly using the solution after removing the carbonate;
d. and (3) drying, namely putting the silver potassium cyanide into a drying oven at the temperature of 95-100 ℃ to dry to obtain a pure silver potassium cyanide product.
5. The method for producing potassium silver cyanide according to claim 1, wherein when silver hydroxide is reacted with potassium cyanide to produce potassium silver cyanide, the method comprises the steps of:
a. adding water into a reaction kettle according to the weight ratio of 1:0.5:8 of potassium cyanide to silver hydroxide, heating to 60-90 ℃, adding potassium cyanide, stirring to dissolve, and adding silver hydroxide to completely dissolve the silver cyanide and the silver hydroxide to generate a silver potassium cyanide solution;
b. concentrating the silver potassium cyanide solution completely reacted under negative pressure until crystals are separated out, and stopping concentrating;
c. cooling the concentrated solution to completely crystallize and precipitate the silver potassium cyanide, filtering to obtain a solid silver potassium cyanide, transferring the solid into a centrifugal machine to wash and remove carbonate to obtain a pure solid silver potassium cyanide, recovering the suction filtration solution, putting the recovered suction filtration solution into the next silver potassium cyanide reaction solution, and repeatedly using the solution after removing the carbonate;
d. and (3) drying, namely putting the silver potassium cyanide into a drying oven at the temperature of 95-100 ℃ to dry to obtain a pure silver potassium cyanide product.
6. The method for producing silver potassium cyanide according to claim 1, wherein the reaction for producing silver potassium cyanide is carried out continuously without stopping after silver hydroxide is produced by the chemical reaction.
7. The method of producing silver potassium cyanide according to claim 4, wherein the silver carbonate is produced by:
putting a certain amount of silver nitrate into a reaction vessel, adding water in a weight ratio of 1-5 times to completely dissolve the silver nitrate, heating to 70-85 ℃, slowly adding 20% potassium carbonate solution into the solution while stirring, and adjusting the pH value to be 7-10 to completely crystallize and precipitate the generated silver carbonate; and when the liquid is colorless and transparent, stopping adding the potassium carbonate solution, stopping stirring, completely precipitating the silver carbonate, filtering to obtain a silver carbonate solid and a potassium nitrate solution, washing the silver carbonate with clear water to dissolve nitrate, and collecting the washing water into a concentrated reaction vessel to be mixed with the potassium nitrate solution.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1161935A (en) * | 1996-04-11 | 1997-10-15 | 郑州大学 | Method for production of silver potassium cyanide |
| CN102874844A (en) * | 2012-10-25 | 2013-01-16 | 河南银城科技股份有限公司 | Method for producing silver potassium cyanide |
| CN104070180A (en) * | 2014-07-30 | 2014-10-01 | 天津市职业大学 | Production method for high-density silver powder for solar cell conductive silver paste |
| CN108190938A (en) * | 2017-12-22 | 2018-06-22 | 昆明理工大学 | It is a kind of to give up the method that silver paste prepares high purity silver nitrate from photovoltaic |
-
2021
- 2021-05-21 CN CN202110557243.5A patent/CN113247919B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1161935A (en) * | 1996-04-11 | 1997-10-15 | 郑州大学 | Method for production of silver potassium cyanide |
| CN102874844A (en) * | 2012-10-25 | 2013-01-16 | 河南银城科技股份有限公司 | Method for producing silver potassium cyanide |
| CN104070180A (en) * | 2014-07-30 | 2014-10-01 | 天津市职业大学 | Production method for high-density silver powder for solar cell conductive silver paste |
| CN108190938A (en) * | 2017-12-22 | 2018-06-22 | 昆明理工大学 | It is a kind of to give up the method that silver paste prepares high purity silver nitrate from photovoltaic |
Non-Patent Citations (3)
| Title |
|---|
| SNEED，M.C: "《无机化学大纲》", 30 November 1963, 上海科学出版社 * |
| 周全法等: ""氧化银法生产高纯度氰化银钾的研究"", 《稀有金属材料与工程》 * |
| 黄涛: "《有机化学实验》", 30 September 1983, 高等教育出版社 * |
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