US1962440A - Zinc dust canister - Google Patents

Zinc dust canister Download PDF

Info

Publication number
US1962440A
US1962440A US651827A US65182733A US1962440A US 1962440 A US1962440 A US 1962440A US 651827 A US651827 A US 651827A US 65182733 A US65182733 A US 65182733A US 1962440 A US1962440 A US 1962440A
Authority
US
United States
Prior art keywords
zinc
canister
gas
zinc dust
vapor
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
Application number
US651827A
Other languages
English (en)
Inventor
Philip M Ginder
George F Halfacre
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
New Jersey Zinc Co
Original Assignee
New Jersey Zinc Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by New Jersey Zinc Co filed Critical New Jersey Zinc Co
Priority to US651827A priority Critical patent/US1962440A/en
Priority to DEN36148D priority patent/DE640649C/de
Application granted granted Critical
Publication of US1962440A publication Critical patent/US1962440A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B19/00—Obtaining zinc or zinc oxide
    • C22B19/04—Obtaining zinc by distilling
    • C22B19/16—Distilling vessels
    • C22B19/18—Condensers, Receiving vessels

Definitions

  • This invention relates to the manufacture of zinc dust and has for its object the provision of certain improvements in the condensation of metallic zinc vapor to zinc dust and the provision of an improved apparatus'therefor. More particularly, the invention contemplates an improved continuous method of making zinc dust of fine and uniform particle size and with a low zinc oxide content, as well as an improved ap- 10 paratus for the practice of that method.
  • Zinc dust is finely divided metallic zinc.
  • the zinc dust products of commerce usually contain small percentages of zinc oxide.
  • the value of the zinc dust is dependent, to some extent at least, upon its metallic zinc content and is, for certain purposes, materially lessened by the presence of zinc oxide.
  • One of the characteristic features of the present invention is that it permits the production of a zinc dust product containing a very small and practically negligible percentage of zinc oxide.
  • Zinc dust has heretofore been incidentally and unavoidably made as a by-product in the production of zinc in ordinary smelter furnaces, being collected in prolongs attached to the customary zinc condensers.
  • This by-pi'oduct zinc dust is usually known as blue powder and is of inferior quality.
  • the canister is periodically filled with atmospheric oxygen during the operation of emptyi it.
  • Atniisph'eric air tends to leak into the canister during the last stages of the distillation, when the supply of zinc vapor decreases as the charge of metallic zinc in the retort approaches exhaustion.
  • the present invention aims to overcome the aforementioned difiiculties, and contemplates a continuous method of making zinc dust of fine and uniform particle size and with a low zinc oxide content.
  • the invention is characterized by condensation of metallic zinc vapor to zinc dust in a substantially gas-tight chamber and under a substantially uniform and constant gas pressure.
  • the substantially gas-tight condensing chamber or canister communicates with a reservoir'containing a gas inert to zinc vapor, such as nitrogen, and the volume of the reservoir is varied automatically in response to any changes in gas conditions in the chamber tending to vary the gas pressure therein.
  • FIG. 1 is a side elevation of an apparatus embodying the invention
  • Fig. 2 is a top plan of the apparatus.
  • a furnace 5 of conventional construction having one or more zinc distillation retorts 6.
  • a charging well 7 communicates through a conduit 8 with the interior of the retort.
  • the retort 6 is connected to the zinc dust condensing chamber or canister 9 by a conduit 10, preferably positioned so as to slope upwardly from the retort to the canister as indicated in Fig. 1.
  • the canister 9 is preferably constructed of sheet iron with welded joints, except as hereinafter explained, and is appropriately mounted on masonry supports or the like.
  • the canister illustrated in the drawings is of rectangular section inall three dimensionalplanes but may be of any appropriate configuration.
  • the top of the canister is provided with a removable cap 11 seated in a fine sand seal 12. This sealed cap provides a safety valve for any'explosion that may occur within the canister.
  • the end of the canister adjacent the conduit 10 communicates at its bottom with a scrap zinc collecting pit 13.
  • the opening between the canister and the pit 13 may be closed by a tight slide door 14.
  • Access to the pit 13 is provided through a door 15.
  • the bottom of the canister, beyond the pit 13, is provided with a series of depending hoppers 16, closed at the bottom by tight slide valves 16.
  • a gas line 1'7 connects the end of the canister, remote from the conduit 10, with a gas reservoir 19.
  • the gas reservoir consists of a cylindrical lower casing 20 within which vertically slides a cylindrical bell or top casing 21; the annular space between the two casings 20 and 21 being provided with a water seal 22.
  • the bell 21 is counter-poised by a counterweight 23.
  • the counterweight is enclosed in a housing 24 and is connected to the bell by a rope 25 passing over sheaves 26.
  • the zinc vapor conduit 10 extends into the canister through a plate 27 removably mounted on the end of the canister. Plates having different openings are provided to accommodate difierent sizes of conduits, thereby permitting variation in the size of the orifice for introducing zinc vapor into the canister.
  • An opening 28 is pro- -vided in one side of the canister approximate the exit end of the conduit 10 in order to provide access to the conduit for keeping it clean 'and open. During normal operations, the opening 28 is closed by luting or the like.
  • the end wall, remote from the conduit 10 is attached to the sides, top and bottom walls by flanged ends 29 bolted or otherwise appropriately secured together.
  • the other sheet metal joints in the canister construction are welded so that the canister as a whole is substantially gas tight.
  • an appropriate volume of molten zinc metal is constantly maintained in the retort 6 by periodically supplying molten metal to the retort through the charge well 7.
  • the molten zinc metal is progressively evaporated by heat supplied fromthe furnace and the resulting zinc vapor passes through the'upwardly directed conduit 10 into the canister 9.
  • Any relatively large particles or droplets of zinc that may be formed by condensation of vapor in the conduit 10 flow back through the conduit into the retort, in consequence'of the slope of the conduit. Relatively large droplets of molten zinc are thus prevented from entering the canister. Any coarse particles of zinc that form immediately after the zinc vaporenters the canister descend upon the slide door 14.
  • the slide door 14 is manipulated to permit the coarse particles accumulating thereon-to drop into the scrap collecting pit 13, and this scrap zinc is removed from the pit through the door 15 as desired or necessary.
  • the finer commercial zinc dust settles in the hoppers 16, the finer product being collected in the hoppers more remote from the zinc vapor conduit 10.
  • the zinc dust product is periodically withdrawn from the hoppers by manipulation of the slide valves 16' which may, if desired, be constructed as double slide valves, one above the other.
  • the canister 9 and gas reservoir 19 are prefer ably filled with an appropriate gas inert to zinc vapor before starting the operation of producing zinc dust.
  • the canister and reservoir may be filled with nitrogen. If desired, the operation may be commenced with the canister and reservoir filled with atmospheric air, in which case the air will soon be deprived of its oxygen content by oxidation of zinc vapor to zinc oxide.
  • the zinc oxide thusinitially produced is prefer-' 'or lower the operating gas pressure therein.
  • the gas and vapor within the canister tend to contract in volume on account of cooling.
  • the reduced pressure resulting from such contraction in gas volume would tend to permit air to enter through any joint that might not be entirely gastight, if it were not for the supply of nitrogen, or
  • the zinc dust product produced in accordance with the invention is fine in particle size and contains over 98% metallic zinc.
  • the particle size of the zinc dust varies inversely with the volume of the canister, so that the particle size can becontrolled in practice by varying the volume of the canister.
  • a zinc dust product of which 99% passed through a 325 mesh standard screen With a canister 90 cubic feet in volume operating under the same conditions, 92 to 93% of the zinc dust product passed through a 325 mesh screen.
  • the zinc dust collected in the hoppers near the point of entrance of the zinc vapor is relatively coarser in particle size than the zinc dust collected in the hoppers more remote from the point of entrance of the zinc vapor, and consequently it is thus possible to produce zinc dust of graded particle sizes.
  • the improvement in the condensation of metallic zinc vapor to zinc dust which comprises condensing the zinc vapor to zinc dust'in a substantially gas-tight chamber, and maintaining through the medium of a gas inert to zinc vapor a substantially constant gas presure within said chamber.
  • the improvement in the condensation of metallic zinc vapor to zinc dust which comprises condensing the zinc vapor to zinc dust in a substantially gas-tight chambercommunicating with a reservoir containing a gas inert to zinc vapor, and maintaining the pressure of the gas in said reservoir substantially constant.
  • the improvement in the condensation of metallic zinc vapor to zinc dust which comprises condensing the zinc vapor to zinc dust in a substantially gas-tight chambercommunicating with a reservoir containing a gas inert to zinc vapor, and maintaining in said reservoir a substantially constant gas pressure slightly in excess of the atmospheric pressure.
  • the improvement in the condensation of metallic zinc vapor to zinc dust which comprises condensing the zinc vapor to zinc dust in a substantially gas-tight chamber communicating with a reservoir containing a gas inert to zinc vapor, and maintaining a substantially constant gas pressure within said chamber by automatically varying the volume of said reservoir in response to a change in gas conditions in the chamber tending to vary the gas pressure therein.
  • the improvement in the condensation of metallic zinc vapor to zinc dust which comprises condensing the zinc vapor to zinc dust in a substantially gas-tight. chamber communicating with a reservoir containing a gas inert to zinc vapor, and maintaining in said chamber a substantially constant gas pressure slightly in excess of the atmospheric pressure by varying the volume of said reservoir in response to changes in gas conditions in the chamber tending to vary the gas.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)
US651827A 1933-01-14 1933-01-14 Zinc dust canister Expired - Lifetime US1962440A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US651827A US1962440A (en) 1933-01-14 1933-01-14 Zinc dust canister
DEN36148D DE640649C (de) 1933-01-14 1934-01-03 Verfahren und Vorrichtung zur Herstellung von fein verteiltem Zink

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US651827A US1962440A (en) 1933-01-14 1933-01-14 Zinc dust canister

Publications (1)

Publication Number Publication Date
US1962440A true US1962440A (en) 1934-06-12

Family

ID=24614387

Family Applications (1)

Application Number Title Priority Date Filing Date
US651827A Expired - Lifetime US1962440A (en) 1933-01-14 1933-01-14 Zinc dust canister

Country Status (2)

Country Link
US (1) US1962440A (de)
DE (1) DE640649C (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5258055A (en) * 1992-08-31 1993-11-02 International Mill Service, Inc. Process and system for recovering zinc and other metal vapors from a gaseous stream

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5258055A (en) * 1992-08-31 1993-11-02 International Mill Service, Inc. Process and system for recovering zinc and other metal vapors from a gaseous stream

Also Published As

Publication number Publication date
DE640649C (de) 1937-01-11

Similar Documents

Publication Publication Date Title
US2378675A (en) Process for halogenation
US1962440A (en) Zinc dust canister
US2433615A (en) Treatment of dross for the recovery of zinc
US2457552A (en) Vertical retort process for zinc smelting
US1712132A (en) Reducing zinciferous materials
US1927763A (en) Process for the electrothermal treatment of materials containing volatile metals or metal oxides
US2061251A (en) Process for separating metals
US1712133A (en) Condensing zinc vapor
US460985A (en) Curt netto
US1594345A (en) Production of magnesium
US1922274A (en) Metallurgical furnace
US2310188A (en) Sublimation refining
US1652184A (en) Process and apparatus for extracting zinc
US1981028A (en) Metallurgical furnace
US1762716A (en) Process of preparing zing dust and apparatus therefor
US1967274A (en) Pyro-electric metallurgical furnace and process
US1914482A (en) Metallurgical furnace
US1832356A (en) Reducing zinciferous materials
US2583351A (en) Manufacture of magnesium
US2255844A (en) Metallurgical furnace
US1848461A (en) h bunce
US1743886A (en) Electric smelting of zinc ore
US1678607A (en) Metallurgy of zinc
US1433533A (en) Process of producing arsenic
US2088165A (en) Production of metals