CA1058865A - Sinter roasting of a sulphurous material - Google Patents
Sinter roasting of a sulphurous materialInfo
- Publication number
- CA1058865A CA1058865A CA261,899A CA261899A CA1058865A CA 1058865 A CA1058865 A CA 1058865A CA 261899 A CA261899 A CA 261899A CA 1058865 A CA1058865 A CA 1058865A
- Authority
- CA
- Canada
- Prior art keywords
- combustion
- stream
- supporting gas
- sulphur
- chamber
- 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
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
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/16—Sintering; Agglomerating
- C22B1/20—Sintering; Agglomerating in sintering machines with movable grates
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B17/00—Sulfur; Compounds thereof
- C01B17/48—Sulfur dioxide; Sulfurous acid
- C01B17/50—Preparation of sulfur dioxide
- C01B17/52—Preparation of sulfur dioxide by roasting sulfides
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
- Inorganic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
ABSTRACT
A process for sinter roasting a layer of sulphurous material on an endless grate, in which a stream of hot gases is produced by burning sulphur with an oxygen containing combustion-supporting gas and is used to ignite a layer of the sulphurous material on an ignition hearth. The gases resulting from the ignition are added to the SO2 containing gases, which are produced during the subsequent sinter roast-ing of the ignited layer, and are used for sulphuric acid production.
A process for sinter roasting a layer of sulphurous material on an endless grate, in which a stream of hot gases is produced by burning sulphur with an oxygen containing combustion-supporting gas and is used to ignite a layer of the sulphurous material on an ignition hearth. The gases resulting from the ignition are added to the SO2 containing gases, which are produced during the subsequent sinter roast-ing of the ignited layer, and are used for sulphuric acid production.
Description
~L058865 This invention relates to a process of sinter roasting a layer of a sulphurous charge such as a charge based on a concentrate of lead, lead and zinc, lead and copper, or copper, on an endless grate such as a Dwight-Lloyd ~achine working in up- or in downdraught, in which S02 con-talning gases are obtained which are used later for sulphuric acid production.
More particularly the invention relates to a new process and apparatus to ignite the layer to be sinter roasted.
The charge layer to be sinter roasted on a Dwight-Lloyd machine is usually ignited under an ignition hearth lined with refractory bricks and equipped with either gas or oil burners, disposed vertically in the arch or horizontally in at least one of the piers of said ignition hearth. The charge is thus ignited by arch radiation and mainly by thermal conduction through contact with the hot gases passing through the charge. The gases exhausted on the ignition suction box of the Dwight-LLoyd machine contain, beside the oil or gas combustion products (H20, C02, C0, 2~ N2)- a certain amount of S02 up to a 1~ content, resulting from the roasting of the ignited charge. Sometimes they are re~ected in the atmosphere, notwithstanding the presence of S02. More commonly they are recycled a~ lean gases under the hood or in the last boxes of the Dwight-Lloyd machine; the only gas output from this machine concerns then so-called rlch gases for the production of sulphuric acid.
However, it is fairly common that by using the above described ignition process, more particularly when charges based on galena are sintered, the S02 content of said rich gases does not reach the required level for the efficient working of the plants for the production of H2S04, either by the contact process (simple or double catalysis) or by the lead chamber system.
It has been proposed in USP 1,861,122 to ignite the charge layer -1- ~
on a Dwight-Lloyd machine by burning powdered highly sulphurous ore suspended in a blast of air in contact with said layer and depositing the burning powdered ore on said layer. Firing with pulvurent ore has the advantage that the firing is utilized for roasting the highly sulphurous ores (for example pyrites and zinc blende) so that the ores need not, as usually, be preliminary roasted. Such firing may also produce a slight increase of the S02 content of the Dwight-Lloyd gases. However, it presents the disadvantage that the burning ore, blown on to the charge layer to be ignited, seriously decreases the permeability of the latter, which perme-ability is very important for the further sinter roasting of the ignited layer. Moreover, it requires the availability of highly sulphurous ores, the presence of which, in the roasted state, in the sinter roasted charge does not interfere with the further treatment of the latter.
The process of this invention avoids the disadvantages of the above prior art processes.
Thus, by one aspect of this invention there is provided a process of sinter roasting a layer of a sulphurous material on an endless grate, in which the layer i8 ignited by contact with a stream of hot gases under an ignition hearth and the gases resulting from the ignition are added to the S02 containing gases which are produced during the subsequent sinter roast-ing of the ignited layer and which are used later for sulphuric acid produc-tion, that process being characterized in that the stream of hot gases is produced by burning elemental sulphur with an oxygen containing combustion-supporting gas.
It is to be noted that the above expression "the S02 containing gases which are produced during the subsequent sinter roasting of the ignited layer and which are used later for sulphuric acid production" covers the S02 rich gases which are produced during the more intensive sinter roasting stage of the layer and which are sent to a sulphuric acid plant as ~.
1~58865 well as the S02 poor gases which are produced during the less intensive sinter roasting stage or stages of the layer and which are recycled in the sinter roasting process in order to be enriched with S02. It is also to be noted that in the process of the present invention, the gases resulting from the ignition may be added either to said S02 poor gases, or to said S2 rich gases, or partially to said S02 poor gases and partially to said S2 rich gases.
Air, oxygen enriched air and oxygen are to be considered as oxygen containing combustion-supporting gases. Air and oxygen enriched air are preferably used as combustion-supporting gases. So, the oxygen content of the combustion-supporting gas may range between 21 and 35% ln volume, depend-ing from the circumstance and more particularly from the nature and moisture of the mixture to be ignited, whereby increasing the flame temperature from about 1000 to about 1600 C and the S02 content of the combustion gases from about 10 to about 28% in volume.
It is particularly advantageous that in the stream of hot gases, sulphur be substantially completely burnt; otherwise, elemental sulphur will deposit on the charge to be sintered.
For this purpose, the stream of hot gases will preferably consist of one or more elemental streams, produced by:
(a) atomizing liquid sulphur with combustion-supporting gas under pressure to yield an elongated jet of atomized sulphur and combustion-supporting gas;
(b) converging towards said jet a plurality of streams of combustion-supporting gas having a velocity component in the direction of advancing of said jet, whereby producing a jet of atomized sulphur containing more combustion-supporting gas;
(c) generating a circular stream of combustion-supporting gas in a plane which is substantially perpendicular to the direction of advancing of the jet resulting from st~p (b) and having this jet passing through said circular io5886s strea~, whereby producing a whirling mixture of atomized sulphur and combustion-s~pporting gas; and (d) priming combustion of said mixture by heating.
When the use of oxygen enriched air proves advantageous, it will preferably be used in steps (~) and (c), while air will be used in step (a).
It is obvious that the sum of quantites of combustion~supporting gas (converted into oxygen quantities) used in these three steps will be such that it is sufficient to burn completely the atomized sulphur and does not produce a needless dilution of the combustion gases. It will e.g. range between 1.10 and 1.20 times the stoichiometric quantity needed to burn the sulphur.
The stream of hot gases used for ignition will advantageously consist of either one elemental stream in~ected substantially horizontally in the aforesaid ignition hearth, or of two elemental streams, in~ected in the opposite direction, substantially parallel and in the same horizontal plane, in said heàrth.
The present invention also relates to a new ignition apparatus with ignition hearth for sinter roasting machines with endless grate, The apparatus according to a second aspect of the invention is characterized in that it comprises:
(a) at least one combustion chamber for sulphur, which is substantially cylindrical;
~b~ a sulphur ato~izer axially set in one base of said chamber;
(c) a plurality of nozzles for combustion-supporting gas set around said atomizer and directed toward the axis of said chamber; and (d) a plurality of nozzles for combustion-supporting gas, set near the other base of said chamber, tangentially to the inner wall of the chamber and substantially in a plane which is perpendicular to the axis of the chamber, the combustion chamber being connected by its said other base to the ignition hearth.
- 105886~
The axis of said chamber will preferably be substantially horlzontal and perpendicular to the direction of advancing of said grate.
The following description of a plant for carrylng out the process of the invention will give a better understanding of the invention. This description, which relates to the sintering on a Dwight-Lloyd machine used in downdraught i8 given as a nonlimitative example and is illustrated by the accompanying drawings, in which Figure 1 represents schematically a side view of the Dwight-Lloyd machine;
Figure 2 represents a horizontal section on a larger scale through the ignition apparatus of said machine, made along line A-A of Figure l; and Figure 3 represents a vertical section through said ignition apparatus, made along line B-B of Figure 2.
Referring to Figure 1, the Dwight-~loyd machine consists essentially of an endless grate 1 progessing in the direction indicated by an arrow, of a charging device 2 to deposit a layer of charge to be sintered on grate 1, of an ignition apparatus 3 to ignite tbe layer, of an ignition suction box 4 to collect the gases from the ignition, of suction boxes 5 to collect rich S02 gases produced during the intensive roasting of the layer and of suction boxes 6 to collect the poor S02 gases produced during the less intensive roasting of the layer. Suction boxes 5 are connected by conducts 7! and collector 8 to an exhaust ventilator 9, sending the rich gases through a conduct which is not represented on the sketch, to a sulphuric acid production unit which also is not represented on the sketch. Ignition suction box 4 and suction boxes 6 are connected by conducts 10 and collector 11 to an exhaust ventilator 12, sending the gases resulting from the ignition and the poo~ S02 gases through a conduct which is not represented on the sketch under hood 13.
Referring now also to Figures 2 and 3, the ignition apparatus 3 consists essentially of: an ignition hearth 14, which is the same as the ignition hearth of the prior art mentioned above; a cylindrical combustion chamber 15 set horizontally on a side pier of hearth 14; a liquid sulphur atomizer 16, fed with air and sulphur under pressure and which is axially set in the front extremity of chamber 15. Combustion chamber 15 lined with refractory bricks 17 just as hearth 14, is equipped at its front extremity with four nozzles 18 for combustion-supporting gas directed under an angle of 45 towards the axis of chamber 15 (the two nozzles which are not repre-sented in Figure 2 are set in the axial plane of chamber 15 which is perpendicular to the plane of the sketch) and with an opening 19 allowing introduction in chamber 15 of a priming burner and near its other extremity with two tangential diametrically opposite nozzles 20 for combustion-supporting gas.
Example.
In the above described plant a galena-based charge was sintered at a rate of 40 tons/hour, in a 12 cm thick and 200 cm wide layer. Sulphur was burnt at a rate of 300 kg per hour using about 1200 Nm3 air an hour, about 600 Nm3 of which in the inclined nozzles and about 400 Nm3 of which in the tangential nozzles. About 5.5 Nm3 of 4.5% rich S02 gases were produced per second, while under the same conditions, but with conventional ignition, about 5.5 Nm3 of 3.5% rich S02 gases are produced per second.
More particularly the invention relates to a new process and apparatus to ignite the layer to be sinter roasted.
The charge layer to be sinter roasted on a Dwight-Lloyd machine is usually ignited under an ignition hearth lined with refractory bricks and equipped with either gas or oil burners, disposed vertically in the arch or horizontally in at least one of the piers of said ignition hearth. The charge is thus ignited by arch radiation and mainly by thermal conduction through contact with the hot gases passing through the charge. The gases exhausted on the ignition suction box of the Dwight-LLoyd machine contain, beside the oil or gas combustion products (H20, C02, C0, 2~ N2)- a certain amount of S02 up to a 1~ content, resulting from the roasting of the ignited charge. Sometimes they are re~ected in the atmosphere, notwithstanding the presence of S02. More commonly they are recycled a~ lean gases under the hood or in the last boxes of the Dwight-Lloyd machine; the only gas output from this machine concerns then so-called rlch gases for the production of sulphuric acid.
However, it is fairly common that by using the above described ignition process, more particularly when charges based on galena are sintered, the S02 content of said rich gases does not reach the required level for the efficient working of the plants for the production of H2S04, either by the contact process (simple or double catalysis) or by the lead chamber system.
It has been proposed in USP 1,861,122 to ignite the charge layer -1- ~
on a Dwight-Lloyd machine by burning powdered highly sulphurous ore suspended in a blast of air in contact with said layer and depositing the burning powdered ore on said layer. Firing with pulvurent ore has the advantage that the firing is utilized for roasting the highly sulphurous ores (for example pyrites and zinc blende) so that the ores need not, as usually, be preliminary roasted. Such firing may also produce a slight increase of the S02 content of the Dwight-Lloyd gases. However, it presents the disadvantage that the burning ore, blown on to the charge layer to be ignited, seriously decreases the permeability of the latter, which perme-ability is very important for the further sinter roasting of the ignited layer. Moreover, it requires the availability of highly sulphurous ores, the presence of which, in the roasted state, in the sinter roasted charge does not interfere with the further treatment of the latter.
The process of this invention avoids the disadvantages of the above prior art processes.
Thus, by one aspect of this invention there is provided a process of sinter roasting a layer of a sulphurous material on an endless grate, in which the layer i8 ignited by contact with a stream of hot gases under an ignition hearth and the gases resulting from the ignition are added to the S02 containing gases which are produced during the subsequent sinter roast-ing of the ignited layer and which are used later for sulphuric acid produc-tion, that process being characterized in that the stream of hot gases is produced by burning elemental sulphur with an oxygen containing combustion-supporting gas.
It is to be noted that the above expression "the S02 containing gases which are produced during the subsequent sinter roasting of the ignited layer and which are used later for sulphuric acid production" covers the S02 rich gases which are produced during the more intensive sinter roasting stage of the layer and which are sent to a sulphuric acid plant as ~.
1~58865 well as the S02 poor gases which are produced during the less intensive sinter roasting stage or stages of the layer and which are recycled in the sinter roasting process in order to be enriched with S02. It is also to be noted that in the process of the present invention, the gases resulting from the ignition may be added either to said S02 poor gases, or to said S2 rich gases, or partially to said S02 poor gases and partially to said S2 rich gases.
Air, oxygen enriched air and oxygen are to be considered as oxygen containing combustion-supporting gases. Air and oxygen enriched air are preferably used as combustion-supporting gases. So, the oxygen content of the combustion-supporting gas may range between 21 and 35% ln volume, depend-ing from the circumstance and more particularly from the nature and moisture of the mixture to be ignited, whereby increasing the flame temperature from about 1000 to about 1600 C and the S02 content of the combustion gases from about 10 to about 28% in volume.
It is particularly advantageous that in the stream of hot gases, sulphur be substantially completely burnt; otherwise, elemental sulphur will deposit on the charge to be sintered.
For this purpose, the stream of hot gases will preferably consist of one or more elemental streams, produced by:
(a) atomizing liquid sulphur with combustion-supporting gas under pressure to yield an elongated jet of atomized sulphur and combustion-supporting gas;
(b) converging towards said jet a plurality of streams of combustion-supporting gas having a velocity component in the direction of advancing of said jet, whereby producing a jet of atomized sulphur containing more combustion-supporting gas;
(c) generating a circular stream of combustion-supporting gas in a plane which is substantially perpendicular to the direction of advancing of the jet resulting from st~p (b) and having this jet passing through said circular io5886s strea~, whereby producing a whirling mixture of atomized sulphur and combustion-s~pporting gas; and (d) priming combustion of said mixture by heating.
When the use of oxygen enriched air proves advantageous, it will preferably be used in steps (~) and (c), while air will be used in step (a).
It is obvious that the sum of quantites of combustion~supporting gas (converted into oxygen quantities) used in these three steps will be such that it is sufficient to burn completely the atomized sulphur and does not produce a needless dilution of the combustion gases. It will e.g. range between 1.10 and 1.20 times the stoichiometric quantity needed to burn the sulphur.
The stream of hot gases used for ignition will advantageously consist of either one elemental stream in~ected substantially horizontally in the aforesaid ignition hearth, or of two elemental streams, in~ected in the opposite direction, substantially parallel and in the same horizontal plane, in said heàrth.
The present invention also relates to a new ignition apparatus with ignition hearth for sinter roasting machines with endless grate, The apparatus according to a second aspect of the invention is characterized in that it comprises:
(a) at least one combustion chamber for sulphur, which is substantially cylindrical;
~b~ a sulphur ato~izer axially set in one base of said chamber;
(c) a plurality of nozzles for combustion-supporting gas set around said atomizer and directed toward the axis of said chamber; and (d) a plurality of nozzles for combustion-supporting gas, set near the other base of said chamber, tangentially to the inner wall of the chamber and substantially in a plane which is perpendicular to the axis of the chamber, the combustion chamber being connected by its said other base to the ignition hearth.
- 105886~
The axis of said chamber will preferably be substantially horlzontal and perpendicular to the direction of advancing of said grate.
The following description of a plant for carrylng out the process of the invention will give a better understanding of the invention. This description, which relates to the sintering on a Dwight-Lloyd machine used in downdraught i8 given as a nonlimitative example and is illustrated by the accompanying drawings, in which Figure 1 represents schematically a side view of the Dwight-Lloyd machine;
Figure 2 represents a horizontal section on a larger scale through the ignition apparatus of said machine, made along line A-A of Figure l; and Figure 3 represents a vertical section through said ignition apparatus, made along line B-B of Figure 2.
Referring to Figure 1, the Dwight-~loyd machine consists essentially of an endless grate 1 progessing in the direction indicated by an arrow, of a charging device 2 to deposit a layer of charge to be sintered on grate 1, of an ignition apparatus 3 to ignite tbe layer, of an ignition suction box 4 to collect the gases from the ignition, of suction boxes 5 to collect rich S02 gases produced during the intensive roasting of the layer and of suction boxes 6 to collect the poor S02 gases produced during the less intensive roasting of the layer. Suction boxes 5 are connected by conducts 7! and collector 8 to an exhaust ventilator 9, sending the rich gases through a conduct which is not represented on the sketch, to a sulphuric acid production unit which also is not represented on the sketch. Ignition suction box 4 and suction boxes 6 are connected by conducts 10 and collector 11 to an exhaust ventilator 12, sending the gases resulting from the ignition and the poo~ S02 gases through a conduct which is not represented on the sketch under hood 13.
Referring now also to Figures 2 and 3, the ignition apparatus 3 consists essentially of: an ignition hearth 14, which is the same as the ignition hearth of the prior art mentioned above; a cylindrical combustion chamber 15 set horizontally on a side pier of hearth 14; a liquid sulphur atomizer 16, fed with air and sulphur under pressure and which is axially set in the front extremity of chamber 15. Combustion chamber 15 lined with refractory bricks 17 just as hearth 14, is equipped at its front extremity with four nozzles 18 for combustion-supporting gas directed under an angle of 45 towards the axis of chamber 15 (the two nozzles which are not repre-sented in Figure 2 are set in the axial plane of chamber 15 which is perpendicular to the plane of the sketch) and with an opening 19 allowing introduction in chamber 15 of a priming burner and near its other extremity with two tangential diametrically opposite nozzles 20 for combustion-supporting gas.
Example.
In the above described plant a galena-based charge was sintered at a rate of 40 tons/hour, in a 12 cm thick and 200 cm wide layer. Sulphur was burnt at a rate of 300 kg per hour using about 1200 Nm3 air an hour, about 600 Nm3 of which in the inclined nozzles and about 400 Nm3 of which in the tangential nozzles. About 5.5 Nm3 of 4.5% rich S02 gases were produced per second, while under the same conditions, but with conventional ignition, about 5.5 Nm3 of 3.5% rich S02 gases are produced per second.
Claims (12)
PROPERTY OR PRIVILEGE IS IS CLAIMED ARE DEFINED AS FOLLOWS:
1. In a process of sinter roasting a lyaer of a sulphurous material on an endless grate, in which the layer is ignited by contact with a stream of hot gases under an ignition hearth and the gases resulting from the ignition are added to SO2 containing gases which are produced during the subsequent sinter roasting of the ignited layer, the improvement which comprises producing the stream of hot gases by burning elemental sulphur with an oxygen containing combustion-supporting gas.
2. A process according to claim 1, wherein the combustion-supporting gas is selected from the group consisting of air and oxygen enriched air.
3. A process according to claim 1, wherein the combustion-supporting gas contains from 21 to 35% by volume of oxygen.
4. A process according to claim 1, wherein the stream of hot gases has a temperature of between about 1000 and about 1600°C.
5. A process according to claim 1, wherein the stream of hot gases has an SO2 content of between about 10 and about 28% by volume.
6. A process according to claim 1, wherein sulphur is substantially completely burnt in the stream of hot gases.
7. A process according to claim 6, wherein the stream of hot gases consists of at least one elemental stream produced by:
(a) atomizing liquid sulphur with combustion-supporting gas under pressure to generate an elongated jet of atomized sulphur and combustion-supporting gas;
(b) converging towards said jet a plurality of streams of combustion-supporting gas having a velocity component in the direction of advancing of said jet, whereby producing a jet of atomized sulphur containing more combustion-supporting gas;
(c) generating a circular stream of combustion-supporting gas in a plane which is substantially perpendicular to the direction of advancing of the jet resulting from step (b) and having this jet passing through said circular stream, whereby producing a whirling mixture of atomized sulphur and combustion-supporting gas; and (d) priming combustion of said mixture by heating.
(a) atomizing liquid sulphur with combustion-supporting gas under pressure to generate an elongated jet of atomized sulphur and combustion-supporting gas;
(b) converging towards said jet a plurality of streams of combustion-supporting gas having a velocity component in the direction of advancing of said jet, whereby producing a jet of atomized sulphur containing more combustion-supporting gas;
(c) generating a circular stream of combustion-supporting gas in a plane which is substantially perpendicular to the direction of advancing of the jet resulting from step (b) and having this jet passing through said circular stream, whereby producing a whirling mixture of atomized sulphur and combustion-supporting gas; and (d) priming combustion of said mixture by heating.
8. A process according to claim 7, wherein the stream of hot gases consists of one elemental stream injected substantially horizontally in the ignition hearth.
9. A process according to claim 7, wherein the stream of hot gases consists of two elemental streams injected in the opposite direction, substantially in a parallel way and in the same horizontal plane, in the ignition hearth.
10. A process according to claim 7, wherein the combustion-supporting gas is air in step (a) and oxygen enriched air in steps (b) and (c).
11. An ignition apparatus with ignition hearth for a sinter roasting machine with an endless grate, said apparatus comprising:
(a) at least one chamber for sulphur combustion, which is substantially cylindrical;
(b) a sulphur atomizer axially set in one base of the chamber;
(c) a plurality of nozzles for combustion-supporting gas set around the atomizer and directed toward the axis of the chamber; and (d) a plurality of nozzles for combustion-supporting gas set near the other base of the chamber, tangentially to the inner wall of the chamber and substantially in a plane which is perpendicular to the axis of the chamber, the chamber being connected by its said other base to the ignition hearth.
(a) at least one chamber for sulphur combustion, which is substantially cylindrical;
(b) a sulphur atomizer axially set in one base of the chamber;
(c) a plurality of nozzles for combustion-supporting gas set around the atomizer and directed toward the axis of the chamber; and (d) a plurality of nozzles for combustion-supporting gas set near the other base of the chamber, tangentially to the inner wall of the chamber and substantially in a plane which is perpendicular to the axis of the chamber, the chamber being connected by its said other base to the ignition hearth.
12. An apparatus according to claim 11, wherein the axis of the chamber is substantially horizontal and perpendicular to the progressing direction of the endless grate.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7530600A FR2327321A1 (en) | 1975-10-07 | 1975-10-07 | AGGLOMERATION GRILLING PROCESS OF A SULPHUROUS MATERIAL |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1058865A true CA1058865A (en) | 1979-07-24 |
Family
ID=9160880
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA261,899A Expired CA1058865A (en) | 1975-10-07 | 1976-09-23 | Sinter roasting of a sulphurous material |
Country Status (8)
| Country | Link |
|---|---|
| JP (1) | JPS5246302A (en) |
| AU (1) | AU499026B2 (en) |
| BE (1) | BE845806A (en) |
| CA (1) | CA1058865A (en) |
| DE (1) | DE2644187A1 (en) |
| FR (1) | FR2327321A1 (en) |
| GB (1) | GB1509670A (en) |
| SE (1) | SE428703B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10240766A1 (en) * | 2002-08-30 | 2004-03-18 | Sudamin Mhd Gmbh | Production of a zinc-containing sinter used as feed material for the thermal recovery of zinc comprises sintering a zinc-containing secondary raw material to which a sulfur-containing secondary energy carrier has been added |
| CN118306952B (en) * | 2024-04-30 | 2024-09-10 | 江苏联恒电子新材料科技有限公司 | High-purity sulfuric acid production equipment and production process |
-
1975
- 1975-10-07 FR FR7530600A patent/FR2327321A1/en active Granted
-
1976
- 1976-09-03 BE BE170307A patent/BE845806A/en not_active IP Right Cessation
- 1976-09-14 SE SE7610142A patent/SE428703B/en not_active IP Right Cessation
- 1976-09-21 GB GB3910376A patent/GB1509670A/en not_active Expired
- 1976-09-23 CA CA261,899A patent/CA1058865A/en not_active Expired
- 1976-09-30 DE DE19762644187 patent/DE2644187A1/en not_active Withdrawn
- 1976-10-07 JP JP12079176A patent/JPS5246302A/en active Pending
- 1976-10-07 AU AU18473/76A patent/AU499026B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| AU1847376A (en) | 1978-04-13 |
| FR2327321A1 (en) | 1977-05-06 |
| DE2644187A1 (en) | 1977-04-21 |
| JPS5246302A (en) | 1977-04-13 |
| FR2327321B1 (en) | 1978-03-17 |
| SE428703B (en) | 1983-07-18 |
| SE7610142L (en) | 1977-04-08 |
| AU499026B2 (en) | 1979-04-05 |
| BE845806A (en) | 1976-12-31 |
| GB1509670A (en) | 1978-05-04 |
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