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US3857699A
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US
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Process for recovering non-ferrous metal values from reverberatory furnace slags
Assignee: Kennecott Utah Copper LLC
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Filing: 1973-03-05
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Granted: 1974-12-31
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Expires: 1993-03-05
Abstract
Abstract The process includes selectively extracting metal values such as molybdenum and copper from ferrosilicate slags containing less than 5 percent by weight magnetite (Fe3O4) into a molten immiscible metal sulfide matte. After the matte-slag extraction step, the metal bearing matte is oxidized. Thereafter, the oxidized matte is leached to dissolve the metal values. The metal bearing leach liquor is then subjected to solvent extraction or precipitation to produce the desired metal product. The metal sulfide matte contains iron and sulfur in a mole ratio of about two to one to nine to one with a matte containing a mole ratio of iron to sulfur of about two to one to three to one being preferred. The temperature of the system during the matte-slag extraction step is maintained between the range of temperatures of the slag melting point (about 1050*C.) and 1600*C. The preferred temperature range for the system is between 1200*C. to 1375*C.
Inventors
- 👤 P Ammann
- 👤 J Kim
- 👤 M Redman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:39
CPC Classifications
C; C22; C22B; C22B7/00; C22B7/04; C22B15/00; C22B34/00; C22B34/30; C22B34/34; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
108 words
A PROCESS FOR RECOVERING MOLYBDENUM VALUES FROM MOLYBDENUM-BEARING, FERRUGINOUS SLAGS COMPRISING TREATING THE SLAG IN AN EXTRACTION STEP BY MIXING THE SLAG WITH A MOLTEN IMMISCIBLE METAL SULFIDE MATTE WHERE THE MATTE CONTAINS IRON AND SULFUR IN AN IRON TO SULFUR MOLE RATIO RANGE OF NINE TO ONE TO TWO TO ONE A A TEMPERAURE RANGING BETWEEN THE SLAG MELTING POINT AND 1600*C. TO PRODUCE A SLAG TREATMENT PRODUCT FROM THE SLAG: SEPARATING THE SLAG TREATMENT PRODUCT FROM THE SLAG ROASTING THE SLAG TREATMENT PRODUCT TO PRODUCE A CALCINE; LEACHING THE CALCINE TO DISSOLVED THE MOLYBDENUM VALUES INTO A LEACH SOLUTION; AND RECOVERING MOLYBDENUM FROM THE LEACH SOLUTION,
Claim 2
Dependent Claim
108 words
A PROCESS FOR RECOVERING MOLYBDENUM VALUES FROM MOLYBDENUM-BEARING, FERRUGINOUS SLAGS COMPRISING TREATING THE SLAG IN AN EXTRACTION STEP BY MIXING THE SLAG WITH A MOLTEN IMMISCIBLE METAL SULFIDE MATTE WHERE THE MATTE CONTAINS IRON AND SULFUR IN AN IRON TO SULFUR MOLE RATIO RANGE OF NINE TO ONE TO TWO TO ONE A A TEMPERAURE RANGING BETWEEN THE SLAG MELTING POINT AND 1600*C. TO PRODUCE A SLAG TREATMENT PRODUCT FROM THE SLAG: SEPARATING THE SLAG TREATMENT PRODUCT FROM THE SLAG ROASTING THE SLAG TREATMENT PRODUCT TO PRODUCE A CALCINE; LEACHING THE CALCINE TO DISSOLVED THE MOLYBDENUM VALUES INTO A LEACH SOLUTION; AND RECOVERING MOLYBDENUM FROM THE LEACH SOLUTION,
Claim 3
Dependent Claim
18 words
The process as set forth in claim 1 wherein the slag treatment product is solidified prior to roasting.
Claim 4
Dependent Claim
34 words
The process as set forth in claim 2 wherein the slag treatment product is solidified by spraying the slag treatment product with water to place the slag treatment product in a finely-divided solid state.
Claim 5
Dependent Claim
20 words
The process as set forth in claim 1 wherein the molybdenum values in the slag are recovered as molybdenum oxide.
Claim 6
Dependent Claim
20 words
The process as set forth in claim 1 wherein the molybdenum values in the slag are recovered as ammonium paramolybdate.
Claim 7
Dependent Claim
17 words
The process as set forth in claim 1 wherein the calcine is leached in a basic solution.
Claim 8
Dependent Claim
17 words
The process as set forth in claim 1 wherein the calcine is leached in an acidic solution.
Claim 9
Dependent Claim
52 words
The process as set forth in claim 1 wherein the composition of the matte is maintained to contain iron and sulfur in a mole ratio of from about three to one to two to one and wherein the temperature of the system during the extraction step is maintained between 1200*C to 1375*C.
Claim 10
Dependent Claim
101 words
In a process for the recovery of molybdenum from a molybdenum-bearing slag which includes the steps of extracting molybdenum values into a molten immiscible metal sulfide matte, oxidizing the matte, leaching the matte and recovering the molybdenum from the leach solution where the improvement comprises controlling the composition of the matte and the temperature of the system during the extraction step so that the metal sulfide matte contains iron and sulfur in a mole ratio of two to one to nine to one with the temperature of the system during the extraction step ranging between the slag melting point and 1600*C.
Claim 11
Dependent Claim
101 words
In a process for the recovery of molybdenum from a molybdenum-bearing slag which includes the steps of extracting molybdenum values into a molten immiscible metal sulfide matte, oxidizing the matte, leaching the matte and recovering the molybdenum from the leach solution where the improvement comprises controlling the composition of the matte and the temperature of the system during the extraction step so that the metal sulfide matte contains iron and sulfur in a mole ratio of two to one to nine to one with the temperature of the system during the extraction step ranging between the slag melting point and 1600*C.
Claim 12
Dependent Claim
57 words
The process as set forth in claim 9 wherein the slag and matte are mixed in a multistage furnace reactor with each stage being connected in series so that the matte in one stage can flow into another stage and wherein the slag can flow from one stage to another counter to the flow of the matte.
Claim 13
Dependent Claim
51 words
The process as set forth in claim 10 wherein the temperature during the extraction step is maintained between the range of 1200*C to 1375* and the composition of the matte is controlled to contain iron and sulfur in a mole ratio of from about 2 to 1 to 3 to 1.
Claim 14
Dependent Claim
19 words
The process as set forth in claim 11 wherein the matte is oxidized at a temperature of about 800*C.
Claim 15
Dependent Claim
20 words
The process as set forth in claim 12 wherein in the leaching step, the calcine is leached in an acid.
Claim 16
Dependent Claim
37 words
The process as set forth in claim 9 wherein the composition of the matte and temperature of the system during the extraction step are maintained to be within the cross-hatched areea of FIG. 9 of the drawing.
Claim 17
Dependent Claim
39 words
The process as set forth in claim 14 wherein the composition of the matte and temperature of the system during the extraction step are maintained to be within the cross-hatched area represented by reference numeral 94 of the drawing.
Claim 18
Dependent Claim
32 words
The process as set forth in claim 1 wherein during the roasting step, the slag treatment product is roasted at a temperature of 800*C to remove sulfur and produce an oxide calcine.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-30 | 1978-07-01 | 1978-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-30 | 1982-07-01 | 1982-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-30 | 1986-07-01 | 1986-12-31 | $7700.00 | Window Closed / Lapsed |