GB931737A - Production of sodium chromate from chromite ores - Google Patents
Production of sodium chromate from chromite oresInfo
- Publication number
- GB931737A GB931737A GB2361661A GB2361661A GB931737A GB 931737 A GB931737 A GB 931737A GB 2361661 A GB2361661 A GB 2361661A GB 2361661 A GB2361661 A GB 2361661A GB 931737 A GB931737 A GB 931737A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pellets
- ore
- sodium chromate
- pelleting
- produced
- 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
Links
- PXLIDIMHPNPGMH-UHFFFAOYSA-N sodium chromate Chemical compound [Na+].[Na+].[O-][Cr]([O-])(=O)=O PXLIDIMHPNPGMH-UHFFFAOYSA-N 0.000 title abstract 6
- 239000008188 pellet Substances 0.000 abstract 8
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 abstract 6
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 abstract 4
- 239000000203 mixture Substances 0.000 abstract 4
- 239000000292 calcium oxide Substances 0.000 abstract 3
- 235000012255 calcium oxide Nutrition 0.000 abstract 3
- 239000011651 chromium Substances 0.000 abstract 3
- 239000007789 gas Substances 0.000 abstract 3
- 239000002245 particle Substances 0.000 abstract 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 abstract 2
- YLUIKWVQCKSMCF-UHFFFAOYSA-N calcium;magnesium;oxygen(2-) Chemical compound [O-2].[O-2].[Mg+2].[Ca+2] YLUIKWVQCKSMCF-UHFFFAOYSA-N 0.000 abstract 2
- UEURCQNQTWXPEE-UHFFFAOYSA-L calcium;magnesium;oxygen(2-);dihydroxide Chemical compound [OH-].[OH-].[O-2].[Mg+2].[Ca+2] UEURCQNQTWXPEE-UHFFFAOYSA-L 0.000 abstract 2
- 229910052804 chromium Inorganic materials 0.000 abstract 2
- 239000000470 constituent Substances 0.000 abstract 2
- QDOXWKRWXJOMAK-UHFFFAOYSA-N dichromium trioxide Chemical compound O=[Cr]O[Cr]=O QDOXWKRWXJOMAK-UHFFFAOYSA-N 0.000 abstract 2
- 235000017550 sodium carbonate Nutrition 0.000 abstract 2
- 229910000029 sodium carbonate Inorganic materials 0.000 abstract 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 abstract 1
- 239000000920 calcium hydroxide Substances 0.000 abstract 1
- 235000011116 calcium hydroxide Nutrition 0.000 abstract 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 abstract 1
- 239000003085 diluting agent Substances 0.000 abstract 1
- 239000000428 dust Substances 0.000 abstract 1
- 239000000446 fuel Substances 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 abstract 1
- 238000011065 in-situ storage Methods 0.000 abstract 1
- 230000001590 oxidative effect Effects 0.000 abstract 1
- 239000001301 oxygen Substances 0.000 abstract 1
- 229910052760 oxygen Inorganic materials 0.000 abstract 1
- 238000010298 pulverizing process Methods 0.000 abstract 1
- 230000000630 rising effect Effects 0.000 abstract 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G37/00—Compounds of chromium
- C01G37/14—Chromates; Bichromates
-
- 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
Abstract
Sodium chromate is produced from noritic chromium ores i.e ores having a Cr2O3 content of 40 to 55% and a Cr to Fe ratio within the range 1,3 to 2,3, by forming a mixture of powdered ore (preferably of average particle size 20 to 75 microns), hydrated non-dolomitic or dolomitic lime, soda ash and water, in the proportions equivalent to 60 to 80 parts of hydrated non-dolomitic lime of 70% CaO content or 75 to 115 parts of hydrated dolomitic lime of 45% CaO content and 50 to 70 parts of <PICT:0931737/III/1> water per 100 parts of ore and approximately the stoichiometric amount of soda ash required to react with the chromium content of the ore to produce sodium chromate. Small pellets produced from the mixture are heated to a temperature of 480 DEG to 600 DEG C., then roasted by passing them through an oxidizing atmosphere rising in temperature from 535 DEG -815 DEG C. to 1090 DEG -1205 DEG C. and then leached to remove the sodium chromate therefrom. Preferably the hydrated dolomitic lime if finely divided i.e, particles pass through an 80 mesh screen (U.S. standard) and preferably the constituents of the mixture to be subjected to pelleting have a particle size of 20 to 125 microns. Although it is preferable to dry the ore before pulverizing it and then mixing the pulverized ore with the other pelleting constituents, the ore may also be ground wet in the presence of quicklime whereby slaked lime is produced in situ. The pellets preferably have an average size not exceeding 1/2 inch in their longest dimension. Preferably the pellets are heated to a temperature of 480 DEG to 600 DEG C. by passing them through the exit gas stream from the kilns at a temperature of 535 DEG to 760 DEG C. In the Figure, a rotating pan pelleting machine 10 is continuously fed with dry mix from line 13 and water from line 14 and the pellets, 16, formed are continuously fed to a foraminous conveyer 18. Hot gases from the pellet-inlet end 25 of rotary kiln 26 flow through dust chamber 21 heating the pellets conveyed therethrough by conveyer 18. The heated pellets are discharged at 27 into the inclined rotating kiln 26 and tumbled therethrough countercurrent to the flow of hot oxygen-containing gases produced by burning a suitable fuel supplied by burner 28. Secondary air is introduced at 29 (by arrow 30). The hot pellets are discharged into leach tank 31, each having a perforated base, and weak sodium chromate solution is added to cover the pellets and percolates through them. Strong sodium chromate solution is withdrawn and the leached residue may be used as a diluent in the pelleting operation.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US4218460A | 1960-07-11 | 1960-07-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB931737A true GB931737A (en) | 1963-07-17 |
Family
ID=21920501
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2361661A Expired GB931737A (en) | 1960-07-11 | 1961-06-29 | Production of sodium chromate from chromite ores |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE1417888B2 (en) |
| GB (1) | GB931737A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2480309A1 (en) * | 1980-04-15 | 1981-10-16 | Cabot Corp | PROCESS FOR SEPARATING REFRACTORY METALS FROM ALLOY WASTE RESISTANT TO OXIDATION |
-
1961
- 1961-06-29 GB GB2361661A patent/GB931737A/en not_active Expired
- 1961-07-10 DE DE19611417888 patent/DE1417888B2/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2480309A1 (en) * | 1980-04-15 | 1981-10-16 | Cabot Corp | PROCESS FOR SEPARATING REFRACTORY METALS FROM ALLOY WASTE RESISTANT TO OXIDATION |
Also Published As
| Publication number | Publication date |
|---|---|
| DE1417888B2 (en) | 1969-11-27 |
| DE1417888A1 (en) | 1968-10-10 |
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