US3865921A - Process for decontamination of hardening salt residue - Google Patents
Process for decontamination of hardening salt residue Download PDFInfo
- Publication number
- US3865921A US3865921A US37149873A US3865921A US 3865921 A US3865921 A US 3865921A US 37149873 A US37149873 A US 37149873A US 3865921 A US3865921 A US 3865921A
- Authority
- US
- United States
- Prior art keywords
- cyanide
- barium
- carbonate
- alkaline earth
- iron
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 150000003839 salts Chemical group 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims description 22
- 238000005202 decontamination Methods 0.000 title abstract description 3
- 230000003588 decontaminative effect Effects 0.000 title abstract description 3
- 239000003513 alkali Substances 0.000 claims abstract description 23
- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 claims abstract description 19
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 19
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 14
- 229910052788 barium Inorganic materials 0.000 claims description 14
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 claims description 14
- 239000002244 precipitate Substances 0.000 claims description 13
- 239000002253 acid Substances 0.000 claims description 11
- 229910052784 alkaline earth metal Inorganic materials 0.000 claims description 9
- 150000001342 alkaline earth metals Chemical class 0.000 claims description 9
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 8
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 8
- 239000000706 filtrate Substances 0.000 claims description 7
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 7
- 229910052742 iron Inorganic materials 0.000 claims description 7
- 239000011707 mineral Substances 0.000 claims description 7
- 229910021577 Iron(II) chloride Inorganic materials 0.000 claims description 6
- NMCUIPGRVMDVDB-UHFFFAOYSA-L iron dichloride Chemical compound Cl[Fe]Cl NMCUIPGRVMDVDB-UHFFFAOYSA-L 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 239000002699 waste material Substances 0.000 claims description 4
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims description 3
- RQPZNWPYLFFXCP-UHFFFAOYSA-L barium dihydroxide Chemical compound [OH-].[OH-].[Ba+2] RQPZNWPYLFFXCP-UHFFFAOYSA-L 0.000 claims description 3
- 229910001863 barium hydroxide Inorganic materials 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 claims description 3
- 150000004679 hydroxides Chemical class 0.000 claims description 3
- 238000005554 pickling Methods 0.000 claims description 3
- 239000002002 slurry Substances 0.000 claims description 2
- VRWKTAYJTKRVCU-UHFFFAOYSA-N iron(6+);hexacyanide Chemical compound [Fe+6].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-] VRWKTAYJTKRVCU-UHFFFAOYSA-N 0.000 claims 1
- 239000000243 solution Substances 0.000 description 9
- 235000010755 mineral Nutrition 0.000 description 5
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 5
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 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 3
- -1 e.g. Chemical compound 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 150000002825 nitriles Chemical class 0.000 description 3
- NNFCIKHAZHQZJG-UHFFFAOYSA-N potassium cyanide Chemical compound [K+].N#[C-] NNFCIKHAZHQZJG-UHFFFAOYSA-N 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 description 2
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 2
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 2
- AYJRCSIUFZENHW-UHFFFAOYSA-L barium carbonate Chemical compound [Ba+2].[O-]C([O-])=O AYJRCSIUFZENHW-UHFFFAOYSA-L 0.000 description 2
- WDIHJSXYQDMJHN-UHFFFAOYSA-L barium chloride Chemical compound [Cl-].[Cl-].[Ba+2] WDIHJSXYQDMJHN-UHFFFAOYSA-L 0.000 description 2
- 229910001626 barium chloride Inorganic materials 0.000 description 2
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 229910001385 heavy metal Inorganic materials 0.000 description 2
- LELOWRISYMNNSU-UHFFFAOYSA-N hydrogen cyanide Chemical compound N#C LELOWRISYMNNSU-UHFFFAOYSA-N 0.000 description 2
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 2
- 239000001095 magnesium carbonate Substances 0.000 description 2
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 2
- 229910000027 potassium carbonate Inorganic materials 0.000 description 2
- 239000000276 potassium ferrocyanide Substances 0.000 description 2
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000012266 salt solution Substances 0.000 description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- ZVCDLGYNFYZZOK-UHFFFAOYSA-M sodium cyanate Chemical compound [Na]OC#N ZVCDLGYNFYZZOK-UHFFFAOYSA-M 0.000 description 2
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 description 2
- LPXPTNMVRIOKMN-UHFFFAOYSA-M sodium nitrite Chemical compound [Na+].[O-]N=O LPXPTNMVRIOKMN-UHFFFAOYSA-M 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- XOGGUFAVLNCTRS-UHFFFAOYSA-N tetrapotassium;iron(2+);hexacyanide Chemical compound [K+].[K+].[K+].[K+].[Fe+2].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-] XOGGUFAVLNCTRS-UHFFFAOYSA-N 0.000 description 2
- YMHBPJJUTGGEFT-UHFFFAOYSA-N C#N.OC=O Chemical compound C#N.OC=O YMHBPJJUTGGEFT-UHFFFAOYSA-N 0.000 description 1
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- 101100496858 Mus musculus Colec12 gene Proteins 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 1
- AZFNGPAYDKGCRB-XCPIVNJJSA-M [(1s,2s)-2-amino-1,2-diphenylethyl]-(4-methylphenyl)sulfonylazanide;chlororuthenium(1+);1-methyl-4-propan-2-ylbenzene Chemical compound [Ru+]Cl.CC(C)C1=CC=C(C)C=C1.C1=CC(C)=CC=C1S(=O)(=O)[N-][C@@H](C=1C=CC=CC=1)[C@@H](N)C1=CC=CC=C1 AZFNGPAYDKGCRB-XCPIVNJJSA-M 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 150000001553 barium compounds Chemical class 0.000 description 1
- 229910001422 barium ion Inorganic materials 0.000 description 1
- AYJRCSIUFZENHW-DEQYMQKBSA-L barium(2+);oxomethanediolate Chemical compound [Ba+2].[O-][14C]([O-])=O AYJRCSIUFZENHW-DEQYMQKBSA-L 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 238000005255 carburizing Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 150000001805 chlorine compounds Chemical class 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- XLJMAIOERFSOGZ-UHFFFAOYSA-M cyanate Chemical compound [O-]C#N XLJMAIOERFSOGZ-UHFFFAOYSA-M 0.000 description 1
- 150000001913 cyanates Chemical class 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 231100000086 high toxicity Toxicity 0.000 description 1
- BDAGIHXWWSANSR-NJFSPNSNSA-N hydroxyformaldehyde Chemical compound O[14CH]=O BDAGIHXWWSANSR-NJFSPNSNSA-N 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- RYZCLUQMCYZBJQ-UHFFFAOYSA-H lead(2+);dicarbonate;dihydroxide Chemical compound [OH-].[OH-].[Pb+2].[Pb+2].[Pb+2].[O-]C([O-])=O.[O-]C([O-])=O RYZCLUQMCYZBJQ-UHFFFAOYSA-H 0.000 description 1
- 229910001629 magnesium chloride Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 150000002823 nitrates Chemical class 0.000 description 1
- 238000005121 nitriding Methods 0.000 description 1
- 150000002826 nitrites Chemical class 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 230000007096 poisonous effect Effects 0.000 description 1
- 229940072033 potash Drugs 0.000 description 1
- 239000001103 potassium chloride Substances 0.000 description 1
- 235000011164 potassium chloride Nutrition 0.000 description 1
- GKKCIDNWFBPDBW-UHFFFAOYSA-M potassium cyanate Chemical compound [K]OC#N GKKCIDNWFBPDBW-UHFFFAOYSA-M 0.000 description 1
- 239000004323 potassium nitrate Substances 0.000 description 1
- 235000010333 potassium nitrate Nutrition 0.000 description 1
- 239000004304 potassium nitrite Substances 0.000 description 1
- 235000010289 potassium nitrite Nutrition 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- MNWBNISUBARLIT-UHFFFAOYSA-N sodium cyanide Chemical compound [Na+].N#[C-] MNWBNISUBARLIT-UHFFFAOYSA-N 0.000 description 1
- 239000000264 sodium ferrocyanide Substances 0.000 description 1
- GTSHREYGKSITGK-UHFFFAOYSA-N sodium ferrocyanide Chemical compound [Na+].[Na+].[Na+].[Na+].[Fe+2].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-] GTSHREYGKSITGK-UHFFFAOYSA-N 0.000 description 1
- 235000012247 sodium ferrocyanide Nutrition 0.000 description 1
- 235000011121 sodium hydroxide Nutrition 0.000 description 1
- 239000004317 sodium nitrate Substances 0.000 description 1
- 235000010344 sodium nitrate Nutrition 0.000 description 1
- 235000010288 sodium nitrite Nutrition 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 229910000018 strontium carbonate Inorganic materials 0.000 description 1
- 229910001631 strontium chloride Inorganic materials 0.000 description 1
- AHBGXTDRMVNFER-UHFFFAOYSA-L strontium dichloride Chemical compound [Cl-].[Cl-].[Sr+2] AHBGXTDRMVNFER-UHFFFAOYSA-L 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 231100000925 very toxic Toxicity 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/40—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using liquids, e.g. salt baths, liquid suspensions
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/34—Methods of heating
- C21D1/44—Methods of heating in heat-treatment baths
- C21D1/46—Salt baths
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
- C21D1/607—Molten salts
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Definitions
- the salts added for this purpose generally include alkali chlorides, e.g., sodium chloride and potassium chloride, alkali cyanides, e.g., sodium cyanide and potassium cyanide, alkali cyanates, e.g., sodium cyanate and potassium cyanate, alkali nitrites, e.g., sodium nitrite and potassium nitrite, alkali nitrates, e.g., sodium nitrate and potassium nitrate, alkali carbonates, e.g., sodium carbonate and potassium carbonate and alkaline earth salts such as barium carbonate, strontium chloride, barium chloride, strontium carbonate, calcium carbonate, magnesium carbonate, calcium chloride, and magnesium chloride.
- alkali carbonates e.g., sodium carbonate and potassium carbonate and alkaline earth salts
- the cyanide salts for example are converted into hydrocyanic acid and this is then burned catalytically.
- the barium and cyanide components of hardening bath residues can be recovered if the salt residue which has been broken down in normal size pieces and slurried in water is treated with an aqueous iron (II) chloride solution at a pH of 7 to 14 in an amount equivalent to the cyanide portion of the residue and in the presence of the least amount of alkali carbonate, e.g., sodium carbonate or potassium carbonate corresponding to alkathere can be used soda or-potash. Soda is preferred since it is frequently already present in the hardening I salt residue. It is preferably added in solid form.
- the concentration of iron (II) chloride in the water ist not critical. Conveniently it is employed as a 5 to 40 so lution.
- the resulting precipitate contains the alkaline earth carbonates, i.e., also magnesium carbonate; the filtrate on the contrary contains the alkali ferrocyanide formed as well as alkali cyanate and alkali chloride.
- the carbonate precipitate after washing with water is dissolved in a mineral acid, preferably hydrochloric acid, and by the addition of barium hydroxide the ,en-
- tire alkaline earth ions with the exception of barium ions were precipitated as hydroxide and separated from barium.
- the hydroxides can be deposited directly with suitable precautions or after conversion to thesulfates.
- the resulting, pure barium. chloride solution can be worked up in known manner, for example, in a spray drier or crystallizer.
- alkali cyanide e.g., sodium cyanide or potassium cyanide
- alkali ferrocyanide e.g., sodium fer rocyanide or potassium ferrocyanide
- the hardening bath residue is broken to the usual granule size, preferably to 2 to 5 mm. Finely divided material to be sure is more easily decomposed but requires higher grinding costs, while with coarse grained material long reaction times are needed in the decomposition.
- This pre-broken salt is then slurried, preferably in 2 /2 times its amount of water.
- the exact amount of water is not critical. For example it can be 1 to 10 times the amount of broken salt.
- the iron (II) salt solution can, if necessary also be added in a somewhat larger than the equivalent amount, namely in an excess up to about 10%.
- the individual concentrations of the iron (II) salt solution, the alkali carbonate solution and the mineral acid are those of commerce and preferably are about grams of material per liter of solution but can be varied widely.
- the industrial advantage of the process of the invention is not only the effective decontamination of the hardening salt residues but also, in the recovery of the main components, barium and cyanide.
- the precipitate was dissolved in l65 liters of 10 weight hydrochloric acid. By the addition of 3 kg of solid Ba(OH the excess acid was neutralized and all of the alkaline earth metals except the barium precipitated. The precipitate formed was filtered off and the filtrate neutralized with hydrochloric acid. The clear solution was evaporated in a spray drier.
- a process of decontaminating a hardening salt residue from treating steel with a hardening salt contain ing alkaline earth metal at least a part of which is barium and also containing cyanide and alkali chloride containing alkaline earth metal at least a part of which is barium and also containing cyanide comprising slurrying the coarsely broken pieces of salt residue in water and then treating said slurry with an amount of aqueous iron (ll) chloride at least sufficient to convert the cyanide portion of said residue to alkali ferrocyanide at a pH of 7-14 and in the presence of alkali carbonate in an amount at least sufficient to convert all of the alkaline earth metal present to the carbonate but not over 30% based on hardening salt residue to be decontaminated, and separating the cyanide containing solution from the carbonate containing precipitate.
- aqueous iron (ll) chloride at least sufficient to convert the cyanide portion of said residue to alkali ferrocyanide at a pH of 7-14 and in the presence
- a process according to claim 1 comprising dissolving the carbonate precipitate in mineral acid, adding barium hydroxide in an amount sufficient to precipitate all of the alkaline earth metals present except the barium as the corresponding hydroxides and separating the alkaline earth hydroxide precipitate from the barium containing filtrate.
- a process according to claim 1 including the steps of separating the cyanide in solution as iron (ll) ferrocyanide by acidifying the solution and adding iron (ll) chloride to precipitate the iron ferrocyanide.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Processing Of Solid Wastes (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Removal Of Specific Substances (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2232123A DE2232123C2 (de) | 1972-06-30 | 1972-06-30 | Verfahren zur Entgiftung von Härtesalzrückständen |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3865921A true US3865921A (en) | 1975-02-11 |
Family
ID=5849310
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US37149873 Expired - Lifetime US3865921A (en) | 1972-06-30 | 1973-06-19 | Process for decontamination of hardening salt residue |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US3865921A (enrdf_load_stackoverflow) |
| DE (1) | DE2232123C2 (enrdf_load_stackoverflow) |
| GB (1) | GB1427574A (enrdf_load_stackoverflow) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4178244A (en) * | 1976-07-28 | 1979-12-11 | Deutsche Gold- Und Silber Scheideanstalt Vormals Roessler | Process for removal of hardening and galvanizing waste water |
| US5769906A (en) * | 1995-10-06 | 1998-06-23 | Durferrit Gmbh Thermotechnik | Process for recovering the salt constituents from hardening-shop salt baths |
| WO2023144458A1 (fr) * | 2022-01-31 | 2023-08-03 | Hydromecanique Et Frottement | Procede de traitement des eaux d'arret et des boues de decrassage par decarbonatation au sein d'une installation chimique de nitruration en bain de sels fondus |
| WO2023144457A1 (fr) * | 2022-01-31 | 2023-08-03 | Hydromecanique Et Frottement | Procede de traitement des eaux d'arret et des boues de decrassage par carbonatation au sein d'une installation chimique de nitruration en bain de sels fondus |
| WO2023144459A1 (fr) * | 2022-01-31 | 2023-08-03 | Hydromecanique Et Frottement | Procede de traitement des eaux d'arret et des boues de decrassage par carbonatation et decarbonatation au sein d'une installation chimique de nitruration en bain de sels fondus |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0036900A1 (de) * | 1980-03-28 | 1981-10-07 | SKF Industrial Trading & Development Co, B.V. | Verfahren und Vorrichtung zur Rückgewinnung von verbrauchtem Härtesalz |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1315219A (en) * | 1919-09-09 | Edward victor espenhahn | ||
| US1604565A (en) * | 1924-10-18 | 1926-10-26 | Coulier Sylvain | Purification of gases |
| US3226182A (en) * | 1962-08-07 | 1965-12-28 | American Cyanamid Co | Purification of crude cyanogen chloride |
| US3695833A (en) * | 1971-06-16 | 1972-10-03 | American Cyanamid Co | Production of alkali metal ferrocyanide |
| US3764659A (en) * | 1969-11-15 | 1973-10-09 | Degussa | Process for the production of calcium hexacyanoferrate (ii) |
-
1972
- 1972-06-30 DE DE2232123A patent/DE2232123C2/de not_active Expired
-
1973
- 1973-06-19 US US37149873 patent/US3865921A/en not_active Expired - Lifetime
- 1973-06-29 GB GB3120473A patent/GB1427574A/en not_active Expired
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1315219A (en) * | 1919-09-09 | Edward victor espenhahn | ||
| US1604565A (en) * | 1924-10-18 | 1926-10-26 | Coulier Sylvain | Purification of gases |
| US3226182A (en) * | 1962-08-07 | 1965-12-28 | American Cyanamid Co | Purification of crude cyanogen chloride |
| US3764659A (en) * | 1969-11-15 | 1973-10-09 | Degussa | Process for the production of calcium hexacyanoferrate (ii) |
| US3695833A (en) * | 1971-06-16 | 1972-10-03 | American Cyanamid Co | Production of alkali metal ferrocyanide |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4178244A (en) * | 1976-07-28 | 1979-12-11 | Deutsche Gold- Und Silber Scheideanstalt Vormals Roessler | Process for removal of hardening and galvanizing waste water |
| US5769906A (en) * | 1995-10-06 | 1998-06-23 | Durferrit Gmbh Thermotechnik | Process for recovering the salt constituents from hardening-shop salt baths |
| WO2023144458A1 (fr) * | 2022-01-31 | 2023-08-03 | Hydromecanique Et Frottement | Procede de traitement des eaux d'arret et des boues de decrassage par decarbonatation au sein d'une installation chimique de nitruration en bain de sels fondus |
| WO2023144457A1 (fr) * | 2022-01-31 | 2023-08-03 | Hydromecanique Et Frottement | Procede de traitement des eaux d'arret et des boues de decrassage par carbonatation au sein d'une installation chimique de nitruration en bain de sels fondus |
| WO2023144459A1 (fr) * | 2022-01-31 | 2023-08-03 | Hydromecanique Et Frottement | Procede de traitement des eaux d'arret et des boues de decrassage par carbonatation et decarbonatation au sein d'une installation chimique de nitruration en bain de sels fondus |
| FR3132300A1 (fr) * | 2022-01-31 | 2023-08-04 | Hydromecanique Et Frottement | Procede de traitement des eaux d’arret et des boues de decrassage par decarbonatation au sein d’une installation chimique de nitruration en bain de sels fondus |
| FR3132298A1 (fr) * | 2022-01-31 | 2023-08-04 | Hydromecanique Et Frottement | Procede de traitement des eaux d’arret et des boues de decrassage par carbonatation au sein d’une installation chimique de nitruration en bain de sels fondus |
| FR3132299A1 (fr) * | 2022-01-31 | 2023-08-04 | Hydromecanique Et Frottement | Procede de traitement des eaux d’arret et des boues de decrassage par carbonatation et decarbonatation au sein d’une installation chimique de nitruration en bain de sels fondus |
Also Published As
| Publication number | Publication date |
|---|---|
| GB1427574A (en) | 1976-03-10 |
| DE2232123C2 (de) | 1974-07-04 |
| DE2232123A1 (enrdf_load_stackoverflow) | 1973-12-06 |
| DE2232123B1 (de) | 1973-12-06 |
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