GB2039859A - Recovery of Tin from Stanniferous Material - Google Patents
Recovery of Tin from Stanniferous Material Download PDFInfo
- Publication number
- GB2039859A GB2039859A GB7901505A GB7901505A GB2039859A GB 2039859 A GB2039859 A GB 2039859A GB 7901505 A GB7901505 A GB 7901505A GB 7901505 A GB7901505 A GB 7901505A GB 2039859 A GB2039859 A GB 2039859A
- Authority
- GB
- United Kingdom
- Prior art keywords
- tin
- melt
- stanniferous material
- blowing
- air
- 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.)
- Granted
Links
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 title claims abstract description 26
- 239000000463 material Substances 0.000 title claims abstract description 21
- 238000011084 recovery Methods 0.000 title description 11
- 239000000155 melt Substances 0.000 claims abstract description 20
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 17
- 239000002893 slag Substances 0.000 claims abstract description 12
- 239000000203 mixture Substances 0.000 claims abstract description 10
- 238000007664 blowing Methods 0.000 claims abstract description 9
- 239000000446 fuel Substances 0.000 claims abstract description 9
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 7
- 229910052840 fayalite Inorganic materials 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 20
- 229910052718 tin Inorganic materials 0.000 description 23
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 10
- 239000011028 pyrite Substances 0.000 description 8
- NIFIFKQPDTWWGU-UHFFFAOYSA-N pyrite Chemical compound [Fe+2].[S-][S-] NIFIFKQPDTWWGU-UHFFFAOYSA-N 0.000 description 8
- 229910052683 pyrite Inorganic materials 0.000 description 8
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000002699 waste material Substances 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 229910001128 Sn alloy Inorganic materials 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- QHGNHLZPVBIIPX-UHFFFAOYSA-N tin(ii) oxide Chemical class [Sn]=O QHGNHLZPVBIIPX-UHFFFAOYSA-N 0.000 description 3
- 239000000292 calcium oxide Substances 0.000 description 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 150000003606 tin compounds Chemical class 0.000 description 2
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000002817 coal dust Substances 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 229910001887 tin oxide Inorganic materials 0.000 description 1
- 229910052905 tridymite Inorganic materials 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
- C22B25/00—Obtaining tin
- C22B25/06—Obtaining tin from scrap, especially tin scrap
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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
Tin is recovered from stanniferous material by either blowing an air-fuel mixture with the air excess number of 0.95 to 1 through a molten bath of the stanniferous material in a fuming furnace in the presence of fayalite slag, the slag to stanniferous material ratio being 4-20:1, and in the presence of a sulphidizing agent or blowing the air-fuel mixture through a molten bath of the stanniferous material in a fuming furnace in the presence of a reducing agent until substantially complete reduction of the oxides contained in the melt and subsequently in the presence of a sulphidizing agent introduced into the reduced melt.
Description
SPECIFICATION
Recovery of Tin from Stanniferous Material
The present invention relates to a method for the recovery of tin from a stanniferous material.
The invention provides a method for the recovery of tin from a stanniferous material, comprising blowing an air-fuel mixture, with the air excess number ranging from 0.95 to 1, through a molten bath of the stanniferous material in a fuming furnace in the presence of fayalite slag, the slag to said initial material ratio being 4-20:1, and of a sulphidizing agent, or blowing said mixture through the molten bath of said stanniferous material in the presence of a reducing agent to be effected until complete reduction of the oxides contained in the melt, subsequently introducing a sulphidizing agent thereinto.
By carrying out the process with the air excess number of 0.95 to 1.00, it becomes possible to increase the process temperature and thereby to enhance the production efficiency thereof. By treating the melt first with a reducing agent and then with a sulphidizing agent, it becomes possible to lower the consumption of the sulphidizing agent.
The method according to the invention is preferably carried out in the following manner.
An initial stanniferous material of low tin content, for example oxide-bearing stanniferous ore, is melted and thereafter poured into a fuming furnace. When in the furnace the melt is blown through with an air-fuel mixture, for example, with combustion products of a gaseous fuel, the air excess number being 0.95 to 1.00; the temperature of the melt is maintained at 11 50 to 1 3500C. After the melt is poured into the furnace, a reducing agent such as coke breeze is introduced thereinto in an amount slightly in excess of that required for reducing highest ferric and stannic oxides to lowest oxides. Then a sulphidizing agent is introduced into the furnace.
The resultant volatile tin compounds are oxidized to tin dioxide above the melt bath by supplying additional air, the tin dioxide being collected from the outgoing gases in dust-collecting apparatus.
On completion of the blowing operation the melt is discharged from the furnace as a waste product.
Metallic stanniferous materials are fed into a fuming furnace precharged with molten fayalite slag at a ratio of slag to stanniferous material of 4-20:1. Under such conditions the temperature of the melt in the furnace is maintained within the range of 1 50 to 1 3500C. After the initial material is melted, during which time ferric oxides are reduced to ferrous oxides, a sulphidizing agent is introduced into the melt as the blowing-through operation is carried out with the air excess number being 0.95 to 1. The sublimates of tin compounds are collected in a manner described in the first instance from the outgoing gases in the form of tin dioxide.
The method according to the invention is superior to the prior-art methods in that it permits:- the treatment of oxide-bearing stanniferous materials both poor and rich in tin;
the production efficiency of the process to be increased by 2 to 8 times, and the recovery of tin in the form of sublimates to be raised by 10 to 20 per cent;
the process equipment to be simplified;
the consumption of sulphidizing agent to be reduced by 20 to 30 per cent.
The invention will be illustrated further by the following Examples.
Example 1
Oxide-bearing ore containing 0.6 per cent by weight of tin, 45 per cent by weight of silicon dioxide, 6 per cent by weight of ferrous oxide, 13 per cent by weight of ferric oxide, and 20 per cent by weight of calcium oxide, is melted and thereafter charged in a fuming furnace having a hearth area of 10 m2. The molten furnace charge is 40 t. The melt is blown through with the products of combustion of natural gas, the air excess number being 0.95. The blowing is effected at the rate of 1 8000 m3/h.
After the melt is charged into the furnace, a reducing agent such as coke breeze is introduced thereinto in an amount of 0.8 t, whereupon the process is carried on until iron and tin oxides are completely reduced to ferrous oxide and tin monoxide. Thereafter, a sulphidizing agent such as pyrite is introduced into the furnace in an amount of 2.4 t. The blowing-through of the melt is carried out for a time period of 60 min. Under these process conditions the temperature of the melt in the furnace is maintained at 1 350 C.
The operating conditions of the process result in the following characteristics:
the tin content of the waste product is 0.04 wt.%;
the recovery of tin in the form of sublimates is 94.7%;
the furnace production efficiency is 96 t/m2/day; the consumption of pyrite is 6 per cent by weight of ore.
Example 2
Oxide-bearing ore is treated as described in
Example 1, the air excess number being 1.0 and the consumption of the sulphidising agent, pyrite, being 1.6 t.
The process has the following characteristics: the tin content of the spent slag is 0.06 wt.%.
the recovery of tin in the form of sublimates is 90%, the production efficiency of the furnace is 96 t/m2 day;
the consumption of pyrite is 4 per cent by weight of ore;
Example 3
This example, according to a prior-art method, is given for the sake of comparison.
Oxide-bearing ore of a composition similar to that described in Example 1 is melted and thereafter blown-through in a fuming furnace with the performance characteristics similar to those described in Example 1. The melt is blown through with the products of combustion of natural gas, which serve as a reducing agent, the air excess number being 0.6. A sulphidizing agent, pyrite, is simultaneously introduced into the melt in an amount of 3.6 t.
The rate of blowing and the amount of the molten charge are the same as in Example 1. The blowing-through time is 120 min, the temperature of the melt in the furnace is 1 2500C.
The process has the following characteristics:- the tin content of the spent slag is 0.25 wt.%;
the recovery of tin in the form of sublimates is 60.2%; the production capacity of the furnace is 48 tSm2/day; the consumption of pyrite is 9 per cent by weight of ore.
Example 4
Molten fayalite slag in an amount of 2000 kg, containing 50 per cent by weight of FeO, 35 per cent by weight of SiO2, and 15 per cent by weight of CaO, is poured into a fuming furnace having a hearth area of 1 m2. Simultaneously, tin alloy scrap (used ball-bearings containing 75 wt.% Al, 1 5 wt.% Fe, 1 Owt.% Sn are charged into the furnace in an amount of 100 kg). The melt is blown through with an air-fuel mixture (coal dust fuel), the air excess number being 0.95. The melt temperature is 12000 C. After dissolving the tin alloy scrap in the molten slag, a sulphidizing agent is introduced in an amount of 60 kg. The blowingthrough time is 50 min.
The process characteristics are the following the tin content of the waste product is 0.08 wt.%;
the recovery of tin in the form of sublimates is 90%; the tin content of the sublimates is 48 to 52%.
Example 5
Tin alloys in an amount of 300 kg are treated as described in Example 4. The sulphidizing agent, pyrite, is added in an amount of 100 kg, whereupon the blowing-through operation is carried out for 45 min.
The process has the following characteristics:
the tin content of the waste product is 0.06 wt.%;
the recovery of tin in the form of sublimates is 98%;
The tin content of the sublimates is 58 to 65 wt%.
Example 6
Tin alloys of the same composition in an amount of 500 kg are treated as described in
Example 4. The sulphidizing agent, pyrite, is added in an amount of 100 kg, whereupon the blowing-through operation is carried out for 60 min.
The process has the following characteristics:
the tin content of the waste product is 0.1 wt.%;
the recovery of tin in the form of sublimates in 94%;
the tin content of the sublimates is 58 to 65 wt.%.
Claims (2)
1. A method of recovering tin from stanniferous material comprising either blowing an air-fuel mixture with the air excess number ranging from 0.95 to 1 through a molten bath of the stanniferous material in a fuming furnace in the presence of fayalite slag, the slag to stanniferous material ratio being 4--20:1, and in the presence of a sulphidizing agent, or blowing the said air-fuel mixture through a molten bath of the stanniferous material in a fuming furnace in the presence of a reducing agent until substantially complete reduction of the oxides contained in the melt and subsequently in the presence of a sulphidizing agent introduced into the reduced melt.
2. A method of recovering tin from stanniferous material, substantially as described in Example 1, 2, 4, 5, or 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB7901505A GB2039859B (en) | 1979-01-16 | 1979-01-16 | Recovery of tin from stanniferous material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB7901505A GB2039859B (en) | 1979-01-16 | 1979-01-16 | Recovery of tin from stanniferous material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2039859A true GB2039859A (en) | 1980-08-20 |
| GB2039859B GB2039859B (en) | 1982-12-08 |
Family
ID=10502538
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7901505A Expired GB2039859B (en) | 1979-01-16 | 1979-01-16 | Recovery of tin from stanniferous material |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2039859B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998011263A1 (en) * | 1996-09-10 | 1998-03-19 | 'holderbank' Financiere Glarus Ag | Method for separating tin and if necessary copper from scrap melting, specially tinplate melting or metallic melting |
| RU2529349C2 (en) * | 2013-03-28 | 2014-09-27 | Виталий Евгеньевич Дьяков | Method to process tin-containing sulphide rejects and burning unit for its implementation |
-
1979
- 1979-01-16 GB GB7901505A patent/GB2039859B/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998011263A1 (en) * | 1996-09-10 | 1998-03-19 | 'holderbank' Financiere Glarus Ag | Method for separating tin and if necessary copper from scrap melting, specially tinplate melting or metallic melting |
| RU2529349C2 (en) * | 2013-03-28 | 2014-09-27 | Виталий Евгеньевич Дьяков | Method to process tin-containing sulphide rejects and burning unit for its implementation |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2039859B (en) | 1982-12-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |