AU5285099A - Method for producing zinc using the is process in an is shaft furnace and corresponding is shaft furnace - Google Patents
Method for producing zinc using the is process in an is shaft furnace and corresponding is shaft furnace Download PDFInfo
- Publication number
- AU5285099A AU5285099A AU52850/99A AU5285099A AU5285099A AU 5285099 A AU5285099 A AU 5285099A AU 52850/99 A AU52850/99 A AU 52850/99A AU 5285099 A AU5285099 A AU 5285099A AU 5285099 A AU5285099 A AU 5285099A
- Authority
- AU
- Australia
- Prior art keywords
- shaft furnace
- dust
- mixture
- carbon carrier
- zinc
- 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
- 238000000034 method Methods 0.000 title claims description 35
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 title claims description 33
- 239000011701 zinc Substances 0.000 title claims description 33
- 229910052725 zinc Inorganic materials 0.000 title claims description 30
- 230000008569 process Effects 0.000 title claims description 19
- 238000004519 manufacturing process Methods 0.000 title description 3
- 239000000428 dust Substances 0.000 claims description 104
- 239000000203 mixture Substances 0.000 claims description 70
- 238000002347 injection Methods 0.000 claims description 59
- 239000007924 injection Substances 0.000 claims description 59
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 42
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 40
- 229910052799 carbon Inorganic materials 0.000 claims description 40
- 239000007789 gas Substances 0.000 claims description 27
- 238000009434 installation Methods 0.000 claims description 23
- 229910052757 nitrogen Inorganic materials 0.000 claims description 21
- 238000002156 mixing Methods 0.000 claims description 15
- 238000007664 blowing Methods 0.000 claims description 13
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 11
- 239000001301 oxygen Substances 0.000 claims description 11
- 229910052760 oxygen Inorganic materials 0.000 claims description 11
- 238000005303 weighing Methods 0.000 claims description 8
- 239000000571 coke Substances 0.000 claims description 6
- 239000002893 slag Substances 0.000 claims description 6
- 238000003860 storage Methods 0.000 claims description 5
- 239000003245 coal Substances 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000011261 inert gas Substances 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 229910001369 Brass Inorganic materials 0.000 claims description 2
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 claims description 2
- 239000003830 anthracite Substances 0.000 claims description 2
- 239000010951 brass Substances 0.000 claims description 2
- 239000003077 lignite Substances 0.000 claims description 2
- 238000012544 monitoring process Methods 0.000 claims description 2
- 229920002994 synthetic fiber Polymers 0.000 claims description 2
- 239000000463 material Substances 0.000 description 18
- 239000002245 particle Substances 0.000 description 6
- 238000010276 construction Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 239000005864 Sulphur Substances 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005243 fluidization Methods 0.000 description 2
- -1 for example Substances 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000001143 conditioned effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 150000002013 dioxins Chemical class 0.000 description 1
- 239000012065 filter cake Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000004868 gas analysis Methods 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000010310 metallurgical process Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 229940110728 nitrogen / oxygen Drugs 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 235000011149 sulphuric acid Nutrition 0.000 description 1
- 239000001117 sulphuric acid Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/10—Charging directly from hoppers or shoots
-
- 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
- C22B19/00—Obtaining zinc or zinc oxide
- C22B19/04—Obtaining zinc by distilling
- C22B19/08—Obtaining zinc by distilling in blast furnaces
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B1/00—Shaft or like vertical or substantially vertical furnaces
- F27B1/10—Details, accessories, or equipment peculiar to furnaces of these types
- F27B1/16—Arrangements of tuyeres
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/0033—Charging; Discharging; Manipulation of charge charging of particulate material
-
- 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
Description
Method for producing zinc using the IS process in an IS shaft furnace and corresponding IS shaft furnace The invention concerns a method to produce zinc according to the IS process in 5 an IS shaft furnace installation and an IS shaft furnace installation to carry out this method. The IS (Imperial Smelting) process to produce zinc as well as IS shaft furnace installations have been known for a long time. The IS process is characterised in 10 that both zinc and lead are produced as raw materials with great yield in one operation. In the case of the known method the furnace is charged with coke and sinter. In addition, secondary dusts, concentrated and briquetted in a rotating pipe, are charged. The disadvantage of this state-of-the-art is that the stages of the concentrating process of the dusts in the rotating pipe and the briquetting are 15 not only labour and cost intensive, but are also damaging to the environment. The invention follows a new path. According to the invention first of all a fine grained dust mixture, containing a carbon carrier and zinc, is directly injected into the lower region of the IS shaft furnace. The direct injection into the reducing 20 zone of the IS shaft furnace produces a number of advantages. The zinc will be obtained as metal directly from the secondary dust without an intermediate stage, like rolling or briquetting. Analyses of the products of IS shaft furnaces show that at least 80% of the injected dusts, based on the total injected amount, is utilised. Moreover, the amount of coke can be reduced when the zinc dust is injected with 25 the carbon carrier, leading to considerable cost reduction, since a fine-grained carbon carrier is considerably more cost-effective than the coke used conventionally. Incidentally, the injection of carbon into the reducing zone of the IS shaft furnace provides a possibility to blow the slag off the hot blast nozzles to reduce the ZnO content in the slag and thus to reduce the zinc losses of the 30 process on the one hand and to produce the slag with a more environmentally friendly analysis on the other. Influences that have a negative affect on the furnace operation, caused by the direct injection, could not be detected. e RA) In the case of the invention the fine-grained carbon carrier is not only metallurgically utilised, but assures the transportability of the dust also, since the transport of the dust by pneumatic means is not possible at all or only with great difficulty. By injecting the dust mixture according to the invention the furnace 5 management with regard to the furnace gas analysis will be drastically changed. The CO content and the H 2 content increase by at least 10 and 30 %, respectively, so that a richer furnace gas is obtained. It has been further established that an IS shaft furnace installation operating in 10 accordance with the method of the invention, also in combination with a sintering plant, a hot briquetting and the direct injection, makes it feasible to offer a satisfactory technology for various materials. The sintering plant with its sulphuric acid production connected downstream can utilise in addition to the classic ore concentrates all those residues that contain sulphur. Moreover, there is the 15 possibility to process filter cakes, sludges, oxide and halogen-containing materials. Hot briquetting is a process whereby the secondary materials, free of sulphur, are processed. In this case the material may vary between dry and moist, having coarse and fine grain. In this case typical initial materials are rolling oxide, filter dusts, dross and ash, that are conditioned for the use in the IS shaft 20 furnace. Dusts, in particular those originating from gas purification plants of the iron and steel industries, that are fine and dry, are utilised to their optimum by the direct injection. In this case metal is formed directly from residual material and/or waste, without prior concentration or other processes being necessary. Typically for the method, neither lead nor copper interfere here, since both metals are 25 recovered in the IS process. Organic adhesions to the materials, e.g. dioxins, are destroyed by the injection into the hot nozzle zone in the IS shaft furnace. To achieve a good transportability of the dust mixture the average grain size of the carbon carrier is between 10 and 200 pm, preferably approx. 50 pm while the 30 average grain size of the dust is smaller than 50 pm, preferably smaller than 10 pm. Therefore the carbon carrier having the aforementioned average grain diameter is particularly well suited as conveying or transporting medium for fine dusts, since the dust particles are smaller than the particles of the carbon carrier, which, as a rule, have a very uneven surface, so that the dust particles can well embed themselves in or adhere to the particles of the carbon carrier. At the same time it has been established that fine coal, anthracite, coke fines, brown coal dust as well as synthetic materials, for example, and mixtures of the aforementioned materials can be used as carbon carrier. Zinc dust, zinc ash, metallurgical copper 5 dust, blast furnace dust, steel mill dust, recirculated cupola furnace dust, brass dust and/or lead dust can be used as zinc-containing dust. The dust should have a minimum content of 15 % of zinc. There is no upper limit for the zinc contents. Dusts having a zinc or lead contents below 15 % should be subjected to a concentration connected upstream. The charge materials may be free of lead or 10 contain considerable amounts of lead particles. Even residual materials containing purely lead can be used. A good transportability of the dust mixture is achieved also by mixing the carbon carrier and the dust in a weight ratio of at least 0.5:1 and preferably in such a 15 ratio that corresponds to the Zn/C ratio of the IS shaft furnace 2, in particular 1:1. This mixing ratio takes the physical point of view of the transportability of the dust mixture into consideration in the first place and the metallurgical aspects are of lesserconsequence. 20 Furthermore, it has been established that it is advantageous to convey the dust mixture from the injecting device by pneumatic means and preferably continuously to the IS shaft furnace. This type of conveying can be easily realised. It has been established that the conveying can be carried out in flying stream with velocities of up to 25-30 m/s or in the case of a corresponding 25 material in dense stream with up to 10 m/s. If required, the direct injection provides the further possibility to influence the metallurgical process in a simple manner, whereby the injected amount of dust, carbon carrier or dust mixture or the ratio of dust to carbon carrier is modified. For 30 this purpose the dust, the carbon carrier and the dust mixture is conveyed with an inert gas, preferably with nitrogen, the dust to carbon carrier ratio is adjustable and the amount of the gas for fluidisation, conveying and setting the velocity of the dust mixture can be controlled.
In addition, the direct injection provides in a simple manner the possibility to influence the temperature in the subhearth of the IS shaft furnace. For this purpose the temperature of the injected forming gas is measured on the hot blast nozzles of the IS shaft furnace as a function of the state of the slag and the 5 injecting device is controlled on the basis of the measured results in such a manner that a basically constant temperature is set at least in the bottom region of the IS shaft furnace. For this purpose in addition to the dust mixture, a gas mixture of nitrogen and of oxygen and/or of air is injected into the IS shaft furnace through the coaxial lances via an annular gap of the coaxial lances, whereby the 10 amount of the gas mixture and the ratio of the nitrogen to the oxygen and/or the air can be controlled particularly as a function of the temperature of the coaxial lances and/or of the IS shaft furnace. Further features, advantages and possibilities of application of the invention 15 become apparent from the sub-claims, the following description of embodiments based on the drawing and the drawing itself. The single figure shows a schematic illustration of a part of the IS shaft furnace installation 1 according to the invention, having an IS shaft furnace 2 and an 20 injection device 3. Through the injection device 3 a fine-grained dust mixture is injected into the IS shaft furnace 2, this mixture having a carbon carrier and dust containing zinc. As it has been explained earlier, as injection material zinc dusts of various origins and as carbon carrier preferably fine coal is used. 25 In the embodiment illustrated the injection device 3 has a storage device 4 having a total of four silos 5, 6, 7, 8. In the case of the injection device 3 illustrated at least two silos are provided for the storage of dust and the remaining silos are provided for the carbon carrier. As a rule, the silos 5, 6, 7, 8 are filled from road tankers in a sealed system under pressure, so that no dust can escape to the 30 outside. It is also possible to discharge the road tankers into transportable silos that are coupled with the silos 5, 6, 7, 8 and the number of which corresponds to that of the silos 5, 6, 7, 8.
The transport and the conveying of the carbon carrier and of the dust is carried out by nitrogen. However, basically the use of another inert gas is also feasible. The IS shaft furnace installation 1 has a nitrogen tank (not illustrated) for the nitrogen, that is stored in liquid form. The nitrogen is vapourised using a cold 5 vapouriser and after reducing the pressure it has a supply pressure of 14-15 bar. The relevant silo(s) can be made inert any time, should trouble occur. To enable to determine troubles, the entire IS shaft furnace installation 1 is being monitored and is connected with a control centre. In addition, a control device is provided to enable to control, when required, the process and the entire plant and to enable 10 to react to troubles at any time. In the case of the IS shaft furnace 1 according to the invention the nitrogen is used for other purposes also, what will be explained in detail in the following. It serves, inter alia, the purpose of cooling the coaxial lances of the injection device, 15 of transporting the dust mixture, of increasing the pressure in the injection vessel (to be described in detail below) as well as of blowing free or blowing back of blocked lines. The nitrogen is used also for the loosening of the dust and of the carbon carrier in the silos 5, 6, 7, 8 and all other containers or devices that are passed through by the dust mixture. Corresponding line connectors are present in 20 the silos, containers and devices, in particular in the region of the bottom, to enable the loosening and fluidisation of the material from below. Since particularly the dust is considered as a material with problems with regard to its storage and transport and its hygroscopic properties (lumping), the silos 5, 6, 7, 8 have vibrating bottoms in the region of their discharges and are insulated and heated. 25 Each of the silos 5, 6, 7, 8 is connected with a weighing device 13 via a screw conveyor 9, 10, 11, 12, respectively. The screw conveyors 9, 10, 11, 12 are also insulated and heated. A slide gate each is provided between the silos and the respective screw conveyor, the slide gate being controlled by the control 30 mechanism just as all other slide gates described later can be controlled. The measuring of the level, pressure and temperature by corresponding means is feasible in each silo 5, 6, 7, 8.
The amounts of carbon carrier and dust to be carried from the relevant silos 5, 6, 7, 8 via the respective screw conveyors 9, 10, 11, 12 depend on the type and composition of the material concerned. After establishing the composition of the material concerned, the ratio of the dust to the carbon carrier to be charged is 5 determined by means of the control device of the IS shaft furnace installation 1. This ratio should be such that the Zn/C ratio of the dust mixture would correspond approximately to that of the IS shaft furnace 2. In addition, so that the dust mixture could be pneumatically transported at all in dense stream, the weight ratio of the carbon carrier to the dust has to be at least 0.5:1. The weight ratio of 10 the pneumatically transported dust mixture is preferably about 1:1. In the case of the weighing device 13 one deals with a weighing hopper. The weighing device 13 is also insulated and heated. In the bottom region of the weighing device 13 inlets are provided to enable the loosening of the material by 15 introducing nitrogen. The weighing device 13 is connected with a mixing device 14 via at least one slide gate; the mixing device is also insulated and heated and the homogenising of the dust mixture, i.e. the attachment of the dust particles on the fine coal grains, takes place in it. 20 The discharge from the mixing device 14 takes place via a corresponding discharge device 15; in the present case one deals with a bucket wheel gate. A slide gate is positioned between the mixing device 14 and the discharge device 15. 25 Positioned downstream from the mixing device 14 and the discharge device 15 there is a classifying device 16; in the present case one deals with a sieving machine to which a sluicing hopper 17 is connected. The classifying device 16 has such a construction that the undersize grain is below 2 mm. A pneumatically actuated slide gate is positioned between the classifying device 16 and the 30 sluicing hopper 17. As is the case in the previously described devices, the sluicing hopper 17 is insulated and is heated and has a level and pressure measuring equipment. Incidentally, in its bottom region the sluicing hopper 17 has appropriate openings to enable the loosening of the dust mixture in the sluicing hopper 17.
The sluicing hopper 17 is connected to an injection vessel 18, while in the line between the sluicing hopper 17 and the injection vessel 18 at least one pneumatically actuated slide gate is provided. After filling and pressurising the sluicing hopper 17 with a pressure that corresponds to that in the injection vessel 5 18 of approx. 2.0-7.0 bar (depending on the type and composition of the dust mixture), both vessels are connected with each other, so that the dust mixture will flow from the sluicing hopper 17 into the injection vessel 18. After emptying the sluicing hopper 17 into the injection vessel 18 the connection is severed and the sluicing hopper 17 can be refilled. The coupling of the sluicing hopper 17 with the 10 injection vessel 18 makes a continuous supply of the dust mixture from the injection vessel 18 to the IS shaft furnace 2 possible, what would be impossible without the sluicing hopper 17. The filling of the sluicing hopper 17 and of the injection vessel 18 takes place as 15 follows: when the mixing time in the mixing device 14 has elapsed, the sluicing hopper 17 can be filled. At this stage the sluicing hopper 17 is not under pressure. The sluicing hopper 17 is filled until the maximum filling level is reached. The transfer can commence at this stage. The plant is constructed in such a manner that that amount which is in the sluicing hopper 17 can be 20 accommodated by the injection vessel 18. The correct progress of the transfer is assured by the control device. When pressurising the sluicing hopper 17 with nitrogen, care is to be taken that the pressure in the sluicing hopper 17 equals the pressure in the injection vessel 18. When this condition is reached, the inlet into the injection vessel 18 is opened and the dust mixture flows from the sluicing 25 hopper 17 into the injection vessel 18. After emptying the sluicing hopper 17 the connection between the injection vessel 18 and the sluicing hopper 17 is interrupted again. Following this the sluicing hopper 17 can be depressurised. On this occasion care is to be taken that during the transfer the pressure in the injection vessel 18 remains on such a level that it can further inject the dust 30 mixture into the IS shaft furnace 2, i.e. during and also after the transfer. If necessary, after the transfer the pressure in the injection vessel 18 is to be corrected or adjusted. A PRA/ In this present case eight loosening vessels 19 are connected downstream from the injection vessel 18, of which only one is shown. The loosening vessels 19 are arranged below the injection vessel 18, while between each loosening vessel 19 and the injection vessel 18 a slide gate is provided, so that the respective 5 loosening vessels can be alternately separated from the injection vessel 18 when certain coaxial lances of the IS shaft furnace 2 are not to be charged. Each of the loosening vessels 19 can be pressurised from below and has a porous bottom plate that serves as loosening bottom. The discharge of the loosening vessels is always in its top region. 10 In the case of the construction according to the invention the loosening and fluidising of the dust mixture is further improved by providing at least one additional line from above into each loosening vessel 19 to supply further nitrogen to accelerate the dust mixture, which line preferably terminates in the form of an 15 annular nozzle. Incidentally, the supply of the so-called by-pass gas via the annular nozzle makes it feasible to control the dust mixture flow independently from the pressure in the injection vessel. A feed line leads from each loosening vessel 19 in the direction of the IS shaft 20 furnace 2. The feed lines commence in the loosening vessels 19 on the discharge of the injection vessel 18. The dust mixture is conveyed from the injection vessel 18 via the individual loosening vessels 19 and from there via the feed lines into the IS shaft furnace 2. The optimum ratio of dust to gas, necessary for pneumatic conveying, is adjusted by loosening the dust mixture in the loosening vessels 19. 25 The dust mixture is conveyed in dense steam of flying steam, depending on the type of the dust. The amount of gas introduced for the purpose of fluidising into the respective loosening vessel 19 is monitored and controlled by the control device. For each dust mixture a certain nominal value for the loosening is specified, depending on its composition. The velocity and the system pressure 30 are also functions of the type of the dust mixture. The least abrasion occurs in the feed lines in the case of pneumatic conveying, wherein the velocity of the dust mixture is up to 10 m/s. LURAi All feed lines, and preferably all other lines of the injection device 3, are insulated and, possibly, heated, at least when the feed lines are installed on the exterior of the plant. To avoid blockages in the individual feed lines by the dust mixtures that are very difficult to convey and to keep the velocity of the dust mixture essentially 5 constant, the lines have a cross-section that increases towards the IS shaft furnace and they do not have throttles like the ones often provided in feed lines for other materials. It is not illustrated that a blowing free of at least a major portion of the lines is 10 possible in the direction of the IS shaft furnace 2 and a reverse blowing in the opposite direction. For this purpose connections with corresponding valves in the lines are provided at various positions, which enable a blowing free and a reverse blowing. The possibility of blowing free and reverse blowing has to be provided to enable the prevention of possible blockages on the lines. A blowing free should 15 be preferably possible from the injection vessel 18 up to the IS shaft furnace 2. The recognition of blockage and consequently the control of the blowing free and reverse blowing by the control device is based on measuring the pressure in the individual feed lines. 20 Two coaxial lances or two hot blast nozzles 20 of the IS shaft furnace 2 are assigned to each loosening vessel 19 and to each feed line from the respective loosening vessel 19. In principle it is, of course, feasible to provide one loosening vessel and one feed line for each lance or each hot blast nozzle 20. This is, however, relatively elaborate and costly. Theoretically it is equally feasible to 25 provide only one loosening vessel with one feed line and then feed the individual coaxial lances or hot blast nozzles via an expensive distributing mechanism. In the case of the construction according to the invention a uniform supply of the individual lances is assured by assigning two coaxial lances to each loosening vessel 19, while in the corresponding feed line a simple T-joint is provided as 30 distributor. However, in principle both lances can be regulated and controlled separately from each other. In principle it is true that a single control of the lances (each lance on its own) as well as a total control (all lances together) may be provided. A4/~Z -ITT4 As it has been explained above, coaxial lances are used as lances. In addition to the dust mixture a gas or a gas mixture is added through these coaxial lances via an external annular gap, the purpose of the gas or the gas mixture being, inter alia, cooling. The gas may be nitrogen, a nitrogen/oxygen mixture or oxygen only. 5 Instead of oxygen air may be used. The ratio of nitrogen to oxygen/air as well as the amount of the gas supplied can be controlled by the control device. The individual lances can be cooled by the gas mixture, while the added oxygen serves also to compensate for the drop of the temperature in the IS shaft furnace before the respective hot blast nozzle. A mixing station (not illustrated), that can 10 be controlled by the control device, is provided for the adjustment of the mixture ratio. On or in the IS shaft furnace 2, in the region of the hot blast nozzles 20, a temperature monitoring of the furnace and, in particular, of the coaxial lances is provided. In addition the amount of dust mixture supplied to each lance or to each pair of lances is measured. The measuring is carried out continuously. The 15 amount of the dust mixture, of the gas mixture and/or the ratio of nitrogen to oxygen is controlled as a function of the measured results. Incidentally, the temperature of the injected forming gas in the IS shaft furnace 2 on all hot blast nozzles 20 can be measured depending on the state of the slag. 20 Depending on the result of the temperature measurement, the injection device 3 can be so controlled that the temperature in the subhearth of the IS shaft furnace 2 and the temperature of the injected forming gas can be held basically constant, for example at approx. 1800 *C. In addition, the process technology makes it feasible to inject only the carbon carrier to enable a better control of the furnace 25 when starting it up or closing it down and to save other fuels, like, for example, coke. 30
Claims (19)
1. A method to produce zinc according to the IS process in an IS shaft furnace installation (1) that has an IS shaft furnace (2) and an injection device (3), 5 wherein a fine-grained dust mixture having a dust containing carbon carrier and zinc is injected into the bottom region of the IS shaft furnace (2), wherein the average grain size of the carbon carrier is between 10 and 1000 pm, preferably approx. 50 pm, and wherein the average grain size of the dust is smaller than 50 pm, preferably smaller than 10 pm. 10
2. A method to produce zinc according to the IS process in an IS shaft furnace installation (1) that has an IS shaft furnace (2) and an injection device (3), wherein a fine-grained dust mixture having a dust containing carbon carrier and zinc is injected into the bottom region of the IS shaft furnace (2), wherein 15 the carbon carrier and the dust are mixed in a weight ratio of at least 0.6:1 and preferably in such a ratio that it corresponds to that of the Zn/C ratio of the IS shaft furnace (2), in particular approx. 1:1, in particular according to claim 1.
3. A method to produce zinc according to the IS process in an IS shaft furnace 20 installation (1) that has an IS shaft furnace (2) and an injection device (3), wherein a fine-grained dust mixture having a dust containing carbon carrier and zinc is injected into the bottom region of the IS shaft furnace (2), wherein the dust mixture is conveyed pneumatically from the injection device (3) and preferably continuously to the shaft furnace (2), in particular according to claim 25 1 or 2.
4. A method to produce zinc according to the IS process in an IS shaft furnace installation (1) that has an IS shaft furnace (2) and an injection device (3), wherein a fine-grained dust mixture having a dust containing carbon carrier 30 and zinc is injected into the bottom region of the IS shaft furnace (2), wherein the dust, the carbon carrier and the dust mixture are conveyed with an inert gas, preferably with nitrogen, wherein the ratio of dust to carbon carrier can be R/ adjusted and wherein the amount of the gases for fluidising, conveying and 4U ICr adjusting the velocity of the dust mixture can be controlled, in particular according to any one of the preceding claims.
5. A method to produce zinc according to the IS process in an IS shaft furnace 5 installation (1) that has an IS shaft furnace (2) with a plurality of hot blast nozzles (20) and an injection device (3), wherein a fine-grained dust mixture having a dust containing carbon carrier and zinc is injected into the bottom region of the IS shaft furnace (2), wherein the temperature of the injected forming gas is measured on the hot blast nozzles (20) as a function of the 10 state of the slag and the injecting device (3) is controlled in such a manner that a basically constant temperature is set at least in the bottom region of the IS shaft furnace (2), in particular according to any one of the preceding claims.
6. A method to produce zinc according to the IS process in an IS shaft furnace 15 installation (1) that has an IS shaft furnace (2) and an injection device (3), wherein a fine-grained dust mixture having a dust containing carbon carrier and zinc is injected into the bottom region of the IS shaft furnace (2), wherein in addition to the dust mixture, a gas mixture of nitrogen as well as of oxygen and/or of air is injected into the IS shaft furnace (2) through the coaxial lances 20 via an annular gap of the relevant coaxial lances, wherein the amount of the gas mixture and the ratio of the nitrogen to the oxygen/air can be controlled particularly as a function of the temperature of the coaxial lances and/or of the IS shaft furnace, in particular according to any one of the preceding claims. 25
7. A method according to any one of the preceding claims, characterised in that fine coal and/or anthracite and/or coke fines and/or brown coal dust and/or synthetic materials is/are used as carbon carrier, and that zinc dust, metallurgical copper dust, blast furnace dust, steel mill dust, recirculated cupola furnace dust, brass dust, zinc ash and/or lead dust is/are preferably 30 used as zinc-containing dust. RA4 1 11
8. A method according to any one of the preceding claims, characterised in that the velocity of the dust mixture during injection may be a maximum of 30 m/s and that in the injection vessel (18) preferably a pressure of at least 1 bar prevails. 5
9. A method according to any one of the preceding claims, characterised in that the amount of dust mixture conveyed to each lance or to each pair of lances is continuously measured and the amount of dust mixture and/or the ratio of nitrogen to oxygen of the gas mixture is controlled preferably as a function of 10 the measured results.
10. A method according to any one of the preceding claims, characterised in that for starting up the IS shaft furnace (2) only the carbon carrier is injected. 15
11. An IS shaft furnace installation (1) with an IS shaft furnace (2) and an injection device (3) to inject a fine-grained dust mixture having a dust containing a carbon carrier and zinc is injected into the IS shaft furnace (2), to carry out the method according to any one of the preceding claims. 20
12. An IS shaft furnace installation according to any one of the preceding claims, characterised in that the injection device (3) has at least one loosening vessel (19) that is preferably connected downstream to the injection vessel (18), that the loosening vessel (19) can be pressurised from below and it has a porous bottom plate, that preferably a separating slide gate is provided between the 25 loosening vessel (19) and the injection vessel (18) and that preferably at least one line is provided from above into the loosening vessel (19) to supply a by pass gas to accelerate the mixture, which line terminates in a nozzle, in particular in a type of annular nozzle. 30
13. An IS shaft furnace installation according to any one of the preceding claims, characterised in that the cross-section of the lines increases from the injection device (3) to the IS shaft furnace (2). j1 RA4/
14. An IS shaft furnace installation according to any one of the preceding claims, characterised in that connections and non-return valves are provided on the lines in the injection device (3) and from the injection device (3) to the IS shaft furnace (2) which enable a blowing free of the lines towards the IS shaft 5 furnace (2) and a reverse blowing in the opposite direction and that preferably the injection device (3) and/or the lines to the IS shaft furnace are heated at least partially.
15. An IS shaft furnace installation according to any one of the preceding claims, 10 characterised in that two coaxial lances in the IS shaft furnace (2) are assigned to each loosening vessel (19) and that preferably a T-piece is provided as distributor.
16. An IS shaft furnace installation according to any one of the preceding claims, 15 characterised in that a gas mixing station that is coupled with the coaxial lances of the IS shaft furnace (2) is provided for mixing nitrogen on the one hand and/or air on the other and by means of which the amount and the ratio of the nitrogen to oxygen/air can be adjusted. 20
17. An IS shaft furnace installation according to any one of the preceding claims, characterised in that a monitoring of the temperature of the coaxial lances is provided.
18. An IS shaft furnace installation according to any one of the preceding claims, 25 characterised in that a control device for controlling the injecting pressure as a function of the temperature of the coaxial lances and/or of the temperature in the IS shaft furnace is provided and/or for the controlling of the amount of dust and carbon carrier charged as a function of the composition of the dust and of the carbon carrier and that the control device is preferably coupled with 30 the gas mixing station. VzT
19. An IS shaft furnace installation according to any one of the preceding claims, characterised in that the injection device (3) has a storage device (4) with at least one silo for the dust and at least one silo for the carbon carrier, 5 a weighing device (13) that is connected preferably downstream from the storage device (4), a mixing device (14) that is connected preferably downstream from the weighing device (13), a classifying device (16) that is connected preferably downstream from the 10 mixing device, at least one sluicing hopper (17) that can be pressurised and is connected preferably downstream from the classifying device (16), and at least one injection vessel (18) that can be pressurised and is connected preferably downstream from the sluicing vessel (17). 15 rV o~
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19832528 | 1998-07-20 | ||
DE19832528 | 1998-07-20 | ||
PCT/EP1999/005143 WO2000005424A1 (en) | 1998-07-20 | 1999-07-20 | Method for producing zinc using the is process in an is shaft furnace and corresponding is shaft furnace |
Publications (2)
Publication Number | Publication Date |
---|---|
AU5285099A true AU5285099A (en) | 2000-02-14 |
AU744597B2 AU744597B2 (en) | 2002-02-28 |
Family
ID=7874644
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AU52850/99A Ceased AU744597B2 (en) | 1998-07-20 | 1999-07-20 | Method for producing zinc using the is process in an is shaft furnace and corresponding is shaft furnace |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP1105544B1 (en) |
JP (1) | JP2002521563A (en) |
CN (1) | CN1182264C (en) |
AU (1) | AU744597B2 (en) |
DE (2) | DE19841980C2 (en) |
PL (1) | PL189908B1 (en) |
WO (1) | WO2000005424A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10240224A1 (en) * | 2002-07-29 | 2004-02-26 | M.I.M. Hüttenwerke Duisburg Gmbh | Process for the thermal recovery of zinc comprises adding a zinc-containing secondary raw material as feed material in the form of molded bricks to a shaft kiln |
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 |
US8551075B2 (en) | 2006-06-02 | 2013-10-08 | Kci Medical Resources | Assemblies, systems, and methods for vacuum assisted internal drainage during wound healing |
CN105506306B (en) * | 2015-12-16 | 2018-06-26 | 北京科技大学 | It is a kind of to utilize steel plant's zinc-containing dust recycling zinc device and its recovery method |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59177331A (en) * | 1983-03-25 | 1984-10-08 | Sumitomo Metal Mining Co Ltd | Method for regulating degree of reduction in blast furnace for simultaneously smelting zinc and lead |
US4606760A (en) * | 1985-05-03 | 1986-08-19 | Huron Valley Steel Corp. | Method and apparatus for simultaneously separating volatile and non-volatile metals |
GB8626086D0 (en) * | 1986-10-31 | 1986-12-03 | Imp Smelting Processes | Operation of zinc-smelting blast furnaces |
JPS63118026A (en) * | 1986-11-05 | 1988-05-23 | Sumitomo Metal Mining Co Ltd | Operating method for zinc blast furnace |
DE4433596A1 (en) * | 1994-09-21 | 1996-03-28 | Heckett Multiserv Plc | Method of pneumatically conveying milled plastics material in reaction vessel |
GB9701615D0 (en) * | 1997-01-27 | 1997-03-19 | Boc Group Plc | Operation of lead/zinc blast furnaces |
-
1998
- 1998-09-12 DE DE19841980A patent/DE19841980C2/en not_active Expired - Fee Related
-
1999
- 1999-07-20 JP JP2000561370A patent/JP2002521563A/en active Pending
- 1999-07-20 DE DE59903049T patent/DE59903049D1/en not_active Expired - Fee Related
- 1999-07-20 EP EP99938290A patent/EP1105544B1/en not_active Expired - Lifetime
- 1999-07-20 PL PL99345591A patent/PL189908B1/en not_active IP Right Cessation
- 1999-07-20 AU AU52850/99A patent/AU744597B2/en not_active Ceased
- 1999-07-20 CN CNB998089311A patent/CN1182264C/en not_active Expired - Fee Related
- 1999-07-20 WO PCT/EP1999/005143 patent/WO2000005424A1/en active IP Right Grant
Also Published As
Publication number | Publication date |
---|---|
EP1105544A1 (en) | 2001-06-13 |
WO2000005424A1 (en) | 2000-02-03 |
DE59903049D1 (en) | 2002-11-14 |
AU744597B2 (en) | 2002-02-28 |
DE19841980C2 (en) | 2002-12-05 |
PL189908B1 (en) | 2005-10-31 |
PL345591A1 (en) | 2001-12-17 |
EP1105544B1 (en) | 2002-10-09 |
CN1182264C (en) | 2004-12-29 |
CN1310768A (en) | 2001-08-29 |
DE19841980A1 (en) | 2000-01-27 |
JP2002521563A (en) | 2002-07-16 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US5445363A (en) | Apparatus for the pneumatic transport of large iron-bearing particles | |
AU764644B2 (en) | Direct reduced iron discharge system | |
RU2005131686A (en) | FEEDING OF SOLID BOILER MATERIALS IN THE DIRECT Smelting PROCESS | |
US6669756B2 (en) | Discharge apparatus for movable hearth type heat-treatment furnace, its operation method, and method and apparatus for manufacturing molten iron using the same | |
AU744597B2 (en) | Method for producing zinc using the is process in an is shaft furnace and corresponding is shaft furnace | |
US8771397B2 (en) | Steelmaking facility comprising a direct reduction plant and an electric-arc furnace | |
JP3281614B2 (en) | Method and apparatus for producing metal from ore | |
EP0515744B1 (en) | Method for the transport of sponge iron | |
GB2032597A (en) | A method and an apparatus for the introduction of pulverised material into the hearth of a shaft furnace | |
US4378244A (en) | System for coal injection in iron oxide reducing kilns | |
US4414025A (en) | Process for addition of silicon to iron | |
CN1037192C (en) | Method for transport of sponge iron | |
CA1143556A (en) | System for recycling char in iron oxide reducing kilns | |
MX2011011848A (en) | Integrated steel plant with production of hot or cold dri. | |
US3178164A (en) | Apparatus for injecting particulate material into furnaces | |
KR100432273B1 (en) | Process and plant for producing of spongy metal | |
US4378241A (en) | Method for achieving low sulfur levels in the DRI product from iron oxide reducing kilns | |
JPH07300609A (en) | Device for charging powdery and granular material in metal refining furnace | |
SU1755023A1 (en) | Apparatus for production of metallurgical lime | |
JPS63183112A (en) | Method for blowing powder into blast furnace | |
Wolf et al. | Furnace injection for carbon and residues | |
JPH0211731A (en) | Apparatus for conveying high temperature powdery pre-reduced ore from fluidized pre-reducing furnace to vertical type smelting reduction furnace | |
Olayebi | REMODIFICATION IN THE OXIDE FEED SYSTEM FOR MIDREX DIRECT REDUCTION SHAFT FURNACE OF THE DELTA STEEL COMPANY | |
Brady et al. | Raw Materials For Ashland | |
JP2003083685A (en) | Drying system for pulverized matter and system for injection into furnace |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
FGA | Letters patent sealed or granted (standard patent) |