US1828756A - Process for the refining of chromium ores - Google Patents
Process for the refining of chromium ores Download PDFInfo
- Publication number
- US1828756A US1828756A US266098A US26609828A US1828756A US 1828756 A US1828756 A US 1828756A US 266098 A US266098 A US 266098A US 26609828 A US26609828 A US 26609828A US 1828756 A US1828756 A US 1828756A
- Authority
- US
- United States
- Prior art keywords
- ore
- chromium
- ores
- refining
- oxygen
- 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
- 239000011651 chromium Substances 0.000 title description 11
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 title description 10
- 229910052804 chromium Inorganic materials 0.000 title description 10
- 238000000034 method Methods 0.000 title description 10
- 238000007670 refining Methods 0.000 title 1
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 8
- 239000001301 oxygen Substances 0.000 description 8
- 229910052760 oxygen Inorganic materials 0.000 description 8
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 4
- 239000003513 alkali Substances 0.000 description 4
- 235000011121 sodium hydroxide Nutrition 0.000 description 4
- 239000002253 acid Substances 0.000 description 3
- 150000008044 alkali metal hydroxides Chemical class 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 2
- 229910000288 alkali metal carbonate Inorganic materials 0.000 description 2
- 150000008041 alkali metal carbonates Chemical class 0.000 description 2
- 229910000423 chromium oxide Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 150000007513 acids Chemical class 0.000 description 1
- 239000008346 aqueous phase Substances 0.000 description 1
- 150000001845 chromium compounds Chemical class 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 239000012943 hotmelt Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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
Definitions
- the ore is-subjected-to the action of alkalies in the absence of oxygen with the result that the gangue only is attacked, so that it will as be easily possible to separate the ore almost completely from the gangue without loss of chromium oxide occuring.
- inferior .ores can be converted wit out great'expense into hi h so percentage ores, which is important not on y in the manufacture of chromium compounds, but also in considerably reducing the'cost of transport.
- the ore subjected to this prelimina treatment [is very easily as worked up so t at higher yields can be .ob
- agents for partial working up alkali metal hydroxides and ea'rbonates are suitable, employed either alonL-or in admixture with 10 one another or withsuch substances as lower the melting point. "The working up. can.
- Or o containing for example of Or o is mixed with the requisite quantity of caustic soda solution and heated in an autoclave in a nitrogen atmosphere to 200 C. with stirring. -When the working-up is complete, the oreis separated from the lye, washed with dilute. acid and dried. According to the source of the raw material, an ore is then ob-' tained containing from -7 0% of Cr O Example 2.-Finely ground chromium ore is mixed with the just requisite quantit of a mixture of sodium carbonate and so ium hydroxide and heated ina rotating furnace in the absence of oxygen to from 400-500" C.
- the hot melt is quenched in water, the ore is separated .from the lye and dried. .
- the lye is worked up to obtain sodium carbonate,
- the-step which comprises. treating an ore at temperatures above 100 C. with an alkali metal carbonate inthe absence of oxygen.
- the 'step which comprises pressure at temperatures above 100 C. with an alkali in the absenceof oxygen.
- step which comprises treating an ore under pressure at temperatures above 100 C. with an alkali metal hydroxide in the absence of oxygen.
- the step which comprises treating an ore under pressure at tempera tures above 100 C. with an alkali metal carbonate in the absence of oxygen.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
- Manufacture And Refinement Of Metals (AREA)
Description
60. acid an Patented Oct. 27, 1931 UNITED STATES PATENT" orrlcs PA'O'L WEISE, 'WIESDOBF-ON-THE-RHINE, FRANZ SPEGHT,:OF OOLOGNE-ON-THE- RHINE, GERMANY, ASSIGNORS TO I. G. FABBEININDUSTBIE AKTIENGESELLSCHAFT, OF FBANKFORT-ON-THE-MAIN, GERMANY, A CORPORATION OF GERMANY PROCESS FOR THE BEFINING O F GHROMIUM OBES 80 Drawing. Application filed March 80, 1928, Serial No. 266,098, and in Germany April 18, 1927.
In the manufacture of chromium com-' pounds from chromium ores the impurities, such as silicic acid, alumina, magnesia and the like, present. in the gangue, often give 15 rise to serious difficulties, since they not only consume anequivalent quantity of the material used for working up the ores, butalso render the ultimate roduct impure and cause difliculties in working because the solutions so cannot be readily filtered.
In accordance with the present invention the ore is-subjected-to the action of alkalies in the absence of oxygen with the result that the gangue only is attacked, so that it will as be easily possible to separate the ore almost completely from the gangue without loss of chromium oxide occuring. By this sim le process inferior .ores can be converted wit out great'expense into hi h so percentage ores, which is important not on y in the manufacture of chromium compounds, but also in considerably reducing the'cost of transport. Besides this, the ore subjected to this prelimina treatment [is very easily as worked up so t at higher yields can be .ob
tained.
As agents for partial working up alkali metal hydroxides and ea'rbonates are suitable, employed either alonL-or in admixture with 10 one another or withsuch substances as lower the melting point. "The working up. can.
equally well be carried out either in the aqueous phase at temperatures above 100 C. with or without increased pressure, .Pyrogenis5 cally at the melting point of. the o rative' agent used for working up the ore. e ores thus treated, are quenched in water or in dilute alkali'solution, filtered land dried. 1 The workin%u agent and also the alumina, silicic j treating an ore under ike can be recovered from the filtrate in the known manner. It is likewise possible by treating the filtered, still damp sludge with dilute acids to further enrich the ore in regard to chromium oxide.
. The following examples will illustrate our lnventionz Ema/mple 1.-Finely ground chomium ore,
containing for example of Or o is mixed with the requisite quantity of caustic soda solution and heated in an autoclave in a nitrogen atmosphere to 200 C. with stirring. -When the working-up is complete, the oreis separated from the lye, washed with dilute. acid and dried. According to the source of the raw material, an ore is then ob-' tained containing from -7 0% of Cr O Example 2.-Finely ground chromium ore is mixed with the just requisite quantit of a mixture of sodium carbonate and so ium hydroxide and heated ina rotating furnace in the absence of oxygen to from 400-500" C.
The hot melt is quenched in water, the ore is separated .from the lye and dried. .The lye is worked up to obtain sodium carbonate,
alumina and silicic acid, while the high percentage chromium ore, thus obtained, is further worked-up according to one of the customary processes.
We claim: 1 In a process for the concentration of chromium ores, the step which comprises treating an ore-at temperatures above 100 C. with an alkali in the absence of oxygen. I
2. In a process for the concentration: of chromium ores, the step which comprises treating an ore at temperatures above C.
with an alkali metal hydroxide in the absence of oxygen.
3. In a process for the concentration of. chromium ores, the-step which comprises. treating an ore at temperatures above 100 C. with an alkali metal carbonate inthe absence of oxygen.
4. In a process for the concentration of ohromium ores, the 'step which comprises pressure at temperatures above 100 C. with an alkali in the absenceof oxygen.
5. In a process for the concentration of chromium ores, the: step which comprises treating an ore under pressure at temperatures above 100 C. with an alkali metal hydroxide in the absence of oxygen.-
6. In a process for the concentration of 6 chromium ores, the step which comprises treating an ore under pressure at tempera tures above 100 C. with an alkali metal carbonate in the absence of oxygen.
In testimony whereof we have hereunto 10 set our hands.
PAUL WEISE. FRANZ SPECHT.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1828756X | 1927-04-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US1828756A true US1828756A (en) | 1931-10-27 |
Family
ID=7745054
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US266098A Expired - Lifetime US1828756A (en) | 1927-04-16 | 1928-03-30 | Process for the refining of chromium ores |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US1828756A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3295954A (en) * | 1963-01-26 | 1967-01-03 | Zahn & Co G M B H | Process for roasting materials containing chromium oxide |
-
1928
- 1928-03-30 US US266098A patent/US1828756A/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3295954A (en) * | 1963-01-26 | 1967-01-03 | Zahn & Co G M B H | Process for roasting materials containing chromium oxide |
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