US1498635A - Retort - Google Patents
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- Publication number
- US1498635A US1498635A US1498635DA US1498635A US 1498635 A US1498635 A US 1498635A US 1498635D A US1498635D A US 1498635DA US 1498635 A US1498635 A US 1498635A
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- Prior art keywords
- retort
- furnace
- plunger
- combustion chamber
- gas
- Prior art date
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- 239000007789 gas Substances 0.000 description 29
- 238000002485 combustion reaction Methods 0.000 description 22
- 239000000047 product Substances 0.000 description 19
- 238000006243 chemical reaction Methods 0.000 description 16
- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 description 11
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 9
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 9
- 239000001301 oxygen Substances 0.000 description 9
- 229910052760 oxygen Inorganic materials 0.000 description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 239000000463 material Substances 0.000 description 8
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 5
- XLJMAIOERFSOGZ-UHFFFAOYSA-M cyanate Chemical compound [O-]C#N XLJMAIOERFSOGZ-UHFFFAOYSA-M 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 4
- LELOWRISYMNNSU-UHFFFAOYSA-N hydrogen cyanide Chemical compound N#C LELOWRISYMNNSU-UHFFFAOYSA-N 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 239000001569 carbon dioxide Substances 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000007800 oxidant agent Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 229910000288 alkali metal carbonate Inorganic materials 0.000 description 1
- 150000008041 alkali metal carbonates Chemical class 0.000 description 1
- 229910000272 alkali metal oxide Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 150000001913 cyanates Chemical class 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 150000002825 nitriles Chemical class 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J6/00—Heat treatments such as Calcining; Fusing ; Pyrolysis
Definitions
- This cyanide material or furnace product containing cyanide is treated after removal from the retort to recover cyanide or hydrocyanic acid. This may be accomplished by leaching the furnace product or by treating it with carbon dioxide or other suitable agents, for ex-A ample, with steam, to convert the cyanide into ammonia.
- Oxygen or oxidizingr agents convert cyanide at low temperatures into cyanate which is not a desirable product. llikt-high temperatures such as arepresent in the ref action zone and particularly in the presenceV of carbon, this undesirable oxidation is avoided.
- Much difficulty V has been experienced in avoiding 4the production of cyanate because the retorts used were so constructed that after the reaction the furnace product ⁇ passed into a zone of low temperature where oxidation was pos-V sible. Consequently ithas been considered necessary to employ nitrogenous gases from 'which oxygen and oxidizing agents have been substantially removed.
- The' object of the invention may be accomplished by the provision of a retort which is adapted to be supported in a suitable furnace and is provided with means to hold the material in the reaction zone and at the temperature thereof until the reaction is completed.
- the meansr employed should prevent contact'of the furnace product with the nitrogenous gases used at a temperature lowerthan that at which the reaction is conducted. Provision should likewise be made for the withdrawal of the furnace product at the conclusion of the reaction.V
- an inclined retort is used, the retort being mounted in the furnace and arranged so that it may be rotated. At the lower end of the retort a plug or plunger is introduced at a point Vsubstantially corresponding with the wall of the surrounding furnace.
- This plunger prevents descent of the furnace product ⁇ beyond the heating zone and is provided with an inlet whereby the nitrogenous gas may be introduced to the retort.
- the plunger is connected preferably to the closure at the end of the retort so that upon removal of the latter the plunger may be withdrawn, thus permitting a portion of the contents of the retort to bc raked therefrom.
- the supply of nitrogenous gas is shut o.
- the furnace product may be raked from the retort into containers which are more or less air-tight to minimize contact of atmospheric oxygen therewith. In the operation there is no contact of the furnace product with oxygen at a temperature lower than that of the reaction for a sufficiently prolonged time to permit oxidationV and the production of cyanates.
- alkali metal carbonate or oxide As an example yof the Lapplication of the invention itis desirable to employ aimixture of alkali metal carbonate or oxide, carbon and iron in the relative proportions of forty parts of sodium carbonate, fifty-eight parts vof coke and a limited quantity of iron, preferably in the neighborhood of two per cent, for example, in -the yform of iron oxide.
- VThese materials are finely ground tand are mixed in a suitable mixingdevice to ensure thorough mingling. Aquantity of water is preferably added during the mixing but .the amount of water is limited so that the mass is not ,perceptibly moist.
- the mass is dried and is then introduced into 'the :reaction chamber or retort and is there subjected to an elevated temperature ranging from 950O to 1100o C. while atmospheric air or an equivalent nitrogenous gas .is Apassed through .and in contact with the mass.
- the vvretort is substantially filled with the mixture ,and is rotated to ensure thoroughcontact-:of the nitrogenous gas ⁇ with all ofthe mixture with the Vresult that the Yni-
- the oxygen present combines with the excess carbon and escapes with vthe gaseous reaction products from the upper end of the retort.
- the furnace product is prevented from descending below the heating zone and is therefore continuously maintained at the temperature of the reaction.
- a suitable fuel for example producer gas
- ⁇ No surplus heat is employed in ⁇ preheating the air which is mixed with the gas before combustion thereof.
- a tube 12 preferably of oxidation-resistant ⁇ material such as .an alloy containing nickel and chromium, isdisposed in suitable openings in the walls of the furnace 5 to
- the rtube is provided with flanges 13 "and 14 resting on rollers 15 and 16.
- the flange 14 bears against a ⁇ thrust roll -1-7 which maintains the tube in proper positioninthe furnace.
- the tube may be -rotatedlby means of a chain 18 engaging a sprocket 19 thereon and a sprocket 20.011 a shaft 21 which may be actuated in any suitable manner.
- the tube 12 is filled with a furnace mixture from the upper end which is open as indicated in the drawing.
- the vlower end ofthe tube is preferably closed by a head 22 bolted or otherwise secured to a iange on the tube.
- the plunger 23 has an extheftubeand,las vwill be apparent none ofthe material is permitted to cool below the temperature of the reaction .Zone and to contact ⁇ thereafter withnitrogenous gas during the operation of the furnace.
- a furnace having a combustion chamber, a retort extending through the chamber and means Within the retort to prevent the contents thereof from passing substantially beyond the Wall of the combustion chamber, said means having a passage to convey gas to the interior of the retort and being removable to permit WithdraWal of the contents thereof.
- a furnace having a combustion chamber, a retort extending in an inclined position through the chamber, and means Within the retort at the lovver end thereof to prevent the contents from passing substantially beyond the Wall of the combustion chamber, said means having a passage to convey gas to the interior of the retort and being removable to permit Withdrawal of the contents thereof.
- a furnace having a combustion chamber, a retort extending through the chamber, means for rotating the retort, means Within the retort to prevent the contents thereof from passing substantially beyond the Wall of the combustion chamber, said means having a passage to convey gas to the interior' of the retort and being removable to permit Withdrawal of the contents thereof, and stationary means to supply gas to the passage while the retort is rotating.
- a furnace having a combustion chamber, a retort extending in an inclined position through the chamber, means for rotating the retort, means Within the retort at the lower end thereof to prevent the contents from passing substantially beyond the Wall of the combustion chamber, said means having a passage to convey gas to the interior of the retort and being removable to permit Withdrawal of the contents thereof,
- a furnace having a combustion chamber, a retort extending through the chamber and a removable plunger Within the retort to prevent the contents thereof from passing substantially beyond the Wall of the combustion chamber, said plunger having an extension with a passage therethrough to convey gas to the interior of the retort.
- a furnace having a combustion chamber, a retort extending through the chamber in an inclined position, and a removable plunger Within the retort at the lower end thereof to prevent the contents thereof from passing substantially beyond the Wall of the combustion chamber, said plunger having an extension With a passage therethrough to convey gas to the interior of the retort.
- a furnace having a combustion chamber, a retort extending through the combustion chamber, means for rotating the retort, a removable plunger Within the retort to prevent the contents thereof from passing substantially beyond the wall of the combustion chamber, said plunger having an extension With a passage therethrough to convey gas to the interior of the retort and stationary means to supply gas to the passage Whilethe retort is rotating.
- a furnace having a combustion chamber, a retort extending in inclined position through the chamber, means for rotating the retort, a removable plunger at the lower end thereof to prevent the contents from passing substantially beyond the Wall of the combustion chamber, said plunger having an extension with a passage therethrough to convey gas to the interior of the retort and stationary means to supply gas to the passage While the retort is rotating.
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- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Muffle Furnaces And Rotary Kilns (AREA)
Description
June 24. 1924. 1,498;635
4 F. J. METZGER REToR'r 'filed Aug. 4, 1923 n -INVENTOR A. ATTORNEYS Patented June 24, i924.
UNITED STATES FLOYD J. METZGER, or NEW YORK, N. Y.,
ASSIGNOR '1"0` CALIFORNIA CYANIDE COM- PANY, INCORPORATED, O'F NEW YORK, N. Y., A CORPORATION 0F DELAWARE.
'RETORR Application filed August 4, 1923. Serial No. 655,643.
To all whom t may concern.'
Be it known that I, FLOYD J. METZGER, a citizen of the United States, residing at New York city, in the county of New York, State of New York, have invented certain new and useful Improvements in Retorts; and I do hereby declare the following to be a full, clear, and exact description of the A method of-l'ixing nitrogen is described in United States Letters Patent No. 1,322,- 195 and involves the heating lof mixtures of alkali metal carbonatesv or oxides with carbon and relatively small amounts of iron, preferably in the form of iron oxide, in the presence of nitrogenous gas. lAs little as two per cent of iron is effective and small amounts are used to avoid filling the reaction chamber with material which does not enter into the composition of the resulting cyanide material. This cyanide material or furnace product containing cyanide is treated after removal from the retort to recover cyanide or hydrocyanic acid. This may be accomplished by leaching the furnace product or by treating it with carbon dioxide or other suitable agents, for ex-A ample, with steam, to convert the cyanide into ammonia.
Oxygen or oxidizingr agents convert cyanide at low temperatures into cyanate which is not a desirable product. llikt-high temperatures such as arepresent in the ref action zone and particularly in the presenceV of carbon, this undesirable oxidation is avoided. Heretofore much difficulty Vhas been experienced in avoiding 4the production of cyanate because the retorts used were so constructed that after the reaction the furnace product `passed into a zone of low temperature where oxidation was pos-V sible. Consequently ithas been considered necessary to employ nitrogenous gases from 'which oxygen and oxidizing agents have been substantially removed.
It is the object of the present invention to provide a retort in which the cyanide reaction may be carried on with nitrogenous gases containing oxygen or oxidizing agents witliout'danger ofloss of cyanide by conversion into cyanate.
Further objects and advantages of the invention will be understood by reference to the following specification and the accompanying drawing in which a retort einbodying the invention is diagrammatically illustrated.
The' object of the invention may be accomplished by the provision of a retort which is adapted to be supported in a suitable furnace and is provided with means to hold the material in the reaction zone and at the temperature thereof until the reaction is completed. The meansr employed should prevent contact'of the furnace product with the nitrogenous gases used at a temperature lowerthan that at which the reaction is conducted. Provision should likewise be made for the withdrawal of the furnace product at the conclusion of the reaction.V To best meet these requirements an inclined retort is used, the retort being mounted in the furnace and arranged so that it may be rotated. At the lower end of the retort a plug or plunger is introduced at a point Vsubstantially corresponding with the wall of the surrounding furnace. This plunger prevents descent of the furnace product `beyond the heating zone and is provided with an inlet whereby the nitrogenous gas may be introduced to the retort. The plunger is connected preferably to the closure at the end of the retort so that upon removal of the latter the plunger may be withdrawn, thus permitting a portion of the contents of the retort to bc raked therefrom. Before the plunger is withdrawn the supply of nitrogenous gas is shut o. The furnace product may be raked from the retort into containers which are more or less air-tight to minimize contact of atmospheric oxygen therewith. In the operation there is no contact of the furnace product with oxygen at a temperature lower than that of the reaction for a sufficiently prolonged time to permit oxidationV and the production of cyanates.
Utilization of the retort as described per- CFT ftrogen is fixed as cyanide.
mits the `use of nitrogenous gases such as atmospheric air .and particularly of gases recovered from the combustion products of the heating furnace. These combustion products contain nitrogen, a considerable proportion of carbon dioxide and some oxygen. The combustion products are scrubbed to remove the carbon dioxide which may be utilized in the `separation of hydrocyanic acid from the furnace product. The remaining ynitrogenous -gases containing a proportion of oxygen are Vparticularly desirable for use in the cyanide reaction. By slightly increasing the proportion of carbon inthe mixture .which is fed to `the retort the presence ofoxygen :may be neutralized and preventing` contact vof vthe oxygen in the nitrogcnous gases .with the ,furnace product at a temperature lower than that of the .reaction the production of cyanate is substantially avoided.
As an example yof the Lapplication of the invention itis desirable to employ aimixture of alkali metal carbonate or oxide, carbon and iron in the relative proportions of forty parts of sodium carbonate, fifty-eight parts vof coke and a limited quantity of iron, preferably in the neighborhood of two per cent, for example, in -the yform of iron oxide. VThese materials are finely ground tand are mixed in a suitable mixingdevice to ensure thorough mingling. Aquantity of water is preferably added during the mixing but .the amount of water is limited so that the mass is not ,perceptibly moist.
The mass is dried and is then introduced into 'the :reaction chamber or retort and is there subjected to an elevated temperature ranging from 950O to 1100o C. while atmospheric air or an equivalent nitrogenous gas .is Apassed through .and in contact with the mass. The vvretort is substantially filled with the mixture ,and is rotated to ensure thoroughcontact-:of the nitrogenous gas `with all ofthe mixture with the Vresult that the Yni- The oxygen ,present combines with the excess carbon and escapes with vthe gaseous reaction products from the upper end of the retort. During `the reaction the furnace product is prevented from descending below the heating zone and is therefore continuously maintained at the temperature of the reaction. l/Vhen the reaction is completed the retort is opened .and `the plunger isV withdrawn. A portion of the charge may be raked from the retort after which the plunger' is returned ,and sufficient material is added to the retort to again substantially lill it. rlhe furnace ,product contains upward to thirty per cent .of cyanide which may be recovered or converted into useful products as hereinbefore described.
-a furnace constructed of brick-work or other `occupy an inclined position.
suitable material and preferably having a refractory lining 6 enclosinga combustion chamber 7. A suitable fuel, for example producer gas, may be supplied from agasproducer 8 through a passage 9 from which the gas is delivered through gas inlets 10 to verably passing through an economizer (not shown). `No surplus heat is employed in `preheating the air which is mixed with the gas before combustion thereof. Reference is made to Letters Patent No. 1,322,195 above referred to for the details of this arrangement.
A tube 12, preferably of oxidation-resistant `material such as .an alloy containing nickel and chromium, isdisposed in suitable openings in the walls of the furnace 5 to The rtube is provided with flanges 13 "and 14 resting on rollers 15 and 16. The flange 14 bears against a `thrust roll -1-7 which maintains the tube in proper positioninthe furnace. The tube may be -rotatedlby means of a chain 18 engaging a sprocket 19 thereon and a sprocket 20.011 a shaft 21 which may be actuated in any suitable manner.
The tube 12 is filled with a furnace mixture from the upper end which is open as indicated in the drawing. The vlower end ofthe tube ispreferably closed by a head 22 bolted or otherwise secured to a iange on the tube. To prevent the travel of the furnace 'mixture` beyond -that portion of the tubewhichis heatedby the furnace, a plun- .ger23 is provided which =is inserted in the `end ofithe tube. The plunger 23 has an extheftubeand,las vwill be apparent none ofthe material is permitted to cool below the temperature of the reaction .Zone and to contact `thereafter withnitrogenous gas during the operation of the furnace. reacting mass lsheld yatthe vmaximum tem- Thus all of ythe perature and the formation of cyanate is prevented. When the freaction is completed the head 22 and plunger 23 are removed and the furnace .product is withdrawn from the tube which is readyfor the succeeding oper- Iation. when the head and plunger Ahavebeen secured again in place.
Various changes may belmade inthe structure described without departing from the invention, it being essential only to provide means to prevent descent of the furnace product during the operation beyond the heating zone.
I claim l. In an apparatus of the character described, a furnace having a combustion chamber, a retort extending through the chamber and means Within the retort to prevent the contents thereof from passing substantially beyond the Wall of the combustion chamber, said means having a passage to convey gas to the interior of the retort and being removable to permit WithdraWal of the contents thereof.
2. In an apparatus of the character described, a furnace having a combustion chamber, a retort extending in an inclined position through the chamber, and means Within the retort at the lovver end thereof to prevent the contents from passing substantially beyond the Wall of the combustion chamber, said means having a passage to convey gas to the interior of the retort and being removable to permit Withdrawal of the contents thereof.
3. In an apparatus of the character described, a furnace having a combustion chamber, a retort extending through the chamber, means for rotating the retort, means Within the retort to prevent the contents thereof from passing substantially beyond the Wall of the combustion chamber, said means having a passage to convey gas to the interior' of the retort and being removable to permit Withdrawal of the contents thereof, and stationary means to supply gas to the passage while the retort is rotating.
4. In an apparatus of the character described, a furnace having a combustion chamber, a retort extending in an inclined position through the chamber, means for rotating the retort, means Within the retort at the lower end thereof to prevent the contents from passing substantially beyond the Wall of the combustion chamber, said means having a passage to convey gas to the interior of the retort and being removable to permit Withdrawal of the contents thereof,
and stationary means to supply gas to the passage While the retort is rotating.
5. In an apparatus of the character described, a furnace having a combustion chamber, a retort extending through the chamber and a removable plunger Within the retort to prevent the contents thereof from passing substantially beyond the Wall of the combustion chamber, said plunger having an extension with a passage therethrough to convey gas to the interior of the retort.
6. In an apparatus of the character described, a furnace having a combustion chamber, a retort extending through the chamber in an inclined position, and a removable plunger Within the retort at the lower end thereof to prevent the contents thereof from passing substantially beyond the Wall of the combustion chamber, said plunger having an extension With a passage therethrough to convey gas to the interior of the retort.
7. In an apparatus of the character described, a furnace having a combustion chamber, a retort extending through the combustion chamber, means for rotating the retort, a removable plunger Within the retort to prevent the contents thereof from passing substantially beyond the wall of the combustion chamber, said plunger having an extension With a passage therethrough to convey gas to the interior of the retort and stationary means to supply gas to the passage Whilethe retort is rotating.
8. In an apparatus of the character described, a furnace having a combustion chamber, a retort extending in inclined position through the chamber, means for rotating the retort, a removable plunger at the lower end thereof to prevent the contents from passing substantially beyond the Wall of the combustion chamber, said plunger having an extension with a passage therethrough to convey gas to the interior of the retort and stationary means to supply gas to the passage While the retort is rotating.
In testimony whereof I atlix my signature.
FLOYD J. METZGER.
Publications (1)
Publication Number | Publication Date |
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US1498635A true US1498635A (en) | 1924-06-24 |
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ID=3406864
Family Applications (1)
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US1498635D Expired - Lifetime US1498635A (en) | Retort |
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US (1) | US1498635A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2468318A (en) * | 1947-10-23 | 1949-04-26 | Young James Kean | Rotary retort |
-
0
- US US1498635D patent/US1498635A/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2468318A (en) * | 1947-10-23 | 1949-04-26 | Young James Kean | Rotary retort |
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