GB966548A - Process for the concentration of chromium ores - Google Patents

Process for the concentration of chromium ores

Info

Publication number
GB966548A
GB966548A GB140861A GB140861A GB966548A GB 966548 A GB966548 A GB 966548A GB 140861 A GB140861 A GB 140861A GB 140861 A GB140861 A GB 140861A GB 966548 A GB966548 A GB 966548A
Authority
GB
United Kingdom
Prior art keywords
chromium
ore
reducing agent
iron
fraction
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
Application number
GB140861A
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.)
Outokumpu Stainless AB
Original Assignee
Avesta Jernverks AB
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 Avesta Jernverks AB filed Critical Avesta Jernverks AB
Publication of GB966548A publication Critical patent/GB966548A/en
Expired legal-status Critical Current

Links

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
    • C22B34/00—Obtaining refractory metals
    • C22B34/30—Obtaining chromium, molybdenum or tungsten
    • C22B34/32—Obtaining chromium

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)

Abstract

In a process for the concentration of chromium in iron-containing chromium ores, the ores are subjected to a reduction treatment in a solid phase at a temperature above 950 DEG C. with a reducing agent containing at least 7% chromium in the form of a chromium-containing alloy and to one or more subsequent processes of grinding and separation, so as to produce an ore product having an increased chromium to iron ratio and an increased chromium oxide content and a metallic product consisting substantially of iron. The chromium-containing alloy reducing agent may be used in conjunction with another reducing agent, e.g. carbon, calcium, carbide or silicon in the solid state, and the reducing agents should preferably be added in such quantities that substantially only iron compounds are reduced A suitable reducing agent is a high-carbon ferro-chromium, i.e. containing 4 to 8% carbon. The reduction may be carried out in a sagger, a rotating furnace, a pushing-type furnace or a shaft furnace. The ore to be concentrated is ground and mixed with the ground reducing agent and sodium chloride. After heating, the mixture is ground and magnetically separated, two fractions being obtained-an ore and a metal fraction, the chromium content of the ore fraction being greater than that in the original ore. An iron-containing chromium ore to be concerntrated may first be mechanically concentrated, e.g. using a shaking table operation, into a heavy and a light fraction. The heavy fraction may be concentrated according to the invention and the light fraction may be used as raw material for the production of the high carbon ferro-chromium reducing agent.ALSO:In a process for the concentration of chromium in iron-containing chromium ores, the ores are subjected to a reduction treatment in a solid phase at a temperature above 950 DEG C. with a reducing agent containing at least 7% chromium in the form of a chromium-containing alloy and to one or more subsequent processes of grinding and separation, so as to produce an ore product having an increased chromium to iron ratio and a metallic product consisting substantially of iron. The chromium-containing alloy reducing agent, which is preferably a high-carbon ferro-chromium i.e. containing 4-8% carbon, may be used in conjunction with another reducing agent, e.g. carbon, calcium carbide or silicon in the solid state. The reduction may be carried out in a sagger, a rotating furnace, a pushing type furnace or a shaft furnace. The ore to be concentrated is ground and mixed with the ground reducing agent and sodium chloride. After heating, the mixture is ground and magnetically separated, two fractions being obtained-an ore and a metal fraction, the chromium content of the ore fraction being greater than that in the original ore. An iron-containing chromium ore to be concentrated may first be mechanically concentrated, e.g. using a shaking table operation, into a heavy and a light fraction. The heavy fraction may be concentrated according to the invention and the light fraction may be used as raw material for the production of the high carbon ferro-chromium reducing agent.
GB140861A 1960-01-18 1961-01-12 Process for the concentration of chromium ores Expired GB966548A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE44360 1960-01-18

Publications (1)

Publication Number Publication Date
GB966548A true GB966548A (en) 1964-08-12

Family

ID=20256582

Family Applications (1)

Application Number Title Priority Date Filing Date
GB140861A Expired GB966548A (en) 1960-01-18 1961-01-12 Process for the concentration of chromium ores

Country Status (2)

Country Link
DE (1) DE1188289B (en)
GB (1) GB966548A (en)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2197146A (en) * 1939-03-24 1940-04-16 Electro Metallurg Co Ore treatment
FR986932A (en) * 1943-12-13 1951-08-07 Electro Chimie Soc D Process for removing iron from chromium or manganese ores and its industrial applications

Also Published As

Publication number Publication date
DE1188289B (en) 1965-03-04

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