TW517093B - Method and apparatus for recovering zinc oxide - Google Patents

Abstract

A method for recovering zinc oxide comprises the steps of: agglomerating a dust; charging the agglomerate to a molten iron in a melting furnace; collecting a dust generated from the melting furnace; recycling a part of the collected dust and recovering another part of the collected dust. An apparatus for recovering zinc oxide comprises: an agglomeration unit for agglomerating a dust containing iron oxide and zinc oxide; a melting furnace for accepting the agglomerate and for holding the molten iron for reducing the dust; and at least two units of dust collector for collecting the dust containing zinc oxide generated from the melting furnace.

Description

Printed by the Central Standards Bureau of the Ministry of Economic Affairs, Shellfish Consumer Cooperatives 517093 A7 B7 V. Description of the Invention (L) Background of the Invention 1. Field of the Invention The present invention relates to the recovery of ash from iron oxides and zinc oxide (ZnO). The hafnium oxide is produced by the method, this ash is produced from the steel mill, and the equipment used in conjunction with this method I. 2. Description of related technologies Steelmaking plants that produce iron from iron ore and waste raw materials produce ash containing large amounts of iron oxides. The resulting ash is called "steel smelting ash" under M. Typical steelmaking ash is blast furnace ash and converter ash. Of the total ash produced by the steel mill, the sum of blast furnace ash and converter ash is as high as 60¾. The main components of blast furnace ash are oxides of carbon and iron, while the main components of converter ash are oxides of iron. Both types of ash contain zinc ranging from 0.1 to 3 wt, which is mainly in the form of zinc oxide, although a small amount of metallic zinc is also present. In order to recover the iron and carbon components from the steelmaking furnace ash, the steelmaking plant recycles the ash. However, because zinc will cause scaffolds on the wall of the blast furnace, it is added to the blast furnace in order to recycle the ash as a raw material, and at the same time to ensure its stable operation, strictly control the accumulation in the blast furnace. The amount of zinc is necessary. The current practice is to limit the amount of zinc added to the blast furnace to 0.1 kg K per ton of pig iron. To accomplish this, the steelmaking plant uses a dezincification unit, such as a wet cyclone, to separate the ash into over-concentration zinc ash and low-concentration zinc ash, and only uses low-concentration zinc ash as The raw materials are recycled into the blast furnace. High-concentration zinc ash is treated by landfill. However, recently the paper size of high-concentration zinc furnace ash mound. Applicable to China National Standard (CNS) A4 specification (210X297 mm) — Λ H. I ......- 1 -I-^^^^ 1 ϋ ----- II --------II---, ^ 1---II m I If---4 (Please read the notes on the back before filling this page) Central Standards of the Ministry of Economic Affairs Printed by the local shellfish consumer cooperative 517093 A7 B7 V. Description of the invention (2) The amount of emissions has increased, causing the problem of difficult handling of the ash. On the other hand, a large amount of scrap iron has been accumulated in Japan. Therefore, from the viewpoint of effective resource utilization, even in a steelmaking plant that has been operating consistently, the original fraction of scrap iron in the available iron sources has continued to increase. In addition, the percentage of galvanized steel in scrap iron has increased, which has also increased the zinc content in the raw materials of steel mills. In response to the recent trend of increasing zinc content in raw materials of steelmaking plants, research is not only on processing high-concentration zinc ash through landfilling, but also actively recovering zinc as a zinc source for smelting Technology in the program. In order to use furnace ash as a source of zinc in the smelting process, it is necessary to increase the zinc concentration as much as possible. In this regard, the target value of the zinc concentration of the order is set to 50wt *%. In addition to the blast furnace steelmaking plant in Shangying, so-called electric furnace steelmaking plants also discharge ash. However, this electric furnace ash mainly contains iron oxide and zinc oxide, which is 20 to 30% of iron oxide and 15 to 25 I zinc oxide. Although approximately 60¾ of the resulting electric furnace ash was recycled as a source of zinc for smelting, the remaining 40¾ was disposed of in landfills. Therefore, the scope of use of electric furnace ash has to be expanded, as in the case of blast furnace ash and converter ash, as a source of zinc for smelting. Therefore, in order to recover zinc from the aforementioned smelting ash and the like as a source of zinc for use in the smelting process, an important concern is how to effectively concentrate zinc to a level of 50% Μ. Unexamined Japanese Patent Publication No. 6-145830 discloses a method for recovering zinc from a steelmaking furnace g. This technique is described below with reference to the drawings. Figure 4 shows that the paper size is applicable to the Chinese National Standard (CNS) A4 specification (210X297 mm)-5--------- — Loading-(Please read the precautions on the back before filling this page)

1T 4 Printed by the Consumer Cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs 517093 A 7 B7 V. Description of the invention (3) Method and process of this technology. The steelmaking furnace ash 2 stored in the first hopper 1 A is sent to the mixer 4 with the binder stored in the adhesive hopper 3, and then the ash and the binder are mixed in the mixer 4 together. . The mixture of the furnace ash 2 and the binder was added to a disc granulator, where the mixture was granulated. This pellet is cured in a rapid curing unit 6 and then dried in a dryer 7. The pellets 10 are stored in a pellet hopper 8, which is here added to the molten iron hopper 9 along with the molten iron 11. The pellets 10 added at the same time as the molten iron 11 are trapped in the molten iron 11, so that the pellets are dispersed in the molten iron 11. The iron oxide in the steelmaking ash 2 reacts with the carbon and silicon in the molten iron to migrate to the original iron, and the form of the M iron is recovered into the molten iron. The zinc oxide in the ash is migrated and evaporated by the carbon in the molten iron. The evaporated zinc oxide is then oxidized in the air to form fine zinc oxide particles having a size of 10 w mM. The evaporated iron and degraded cold pellets float above the surface of the molten iron, which is then collected by the dust collector 13 with the zinc oxide particles through the dust collection duct 12. In order to increase the zinc concentration in the ash collected by the dust collector 13, the ash collected by the dust collector 13 is sent to the second material 41B via the distributor 15 for storage, and then is carried out as previously described. Similar processing. This treatment can increase the zinc concentration in the ash, and finally the ash recovered in the hopper 1E has a zinc concentration of 50 wt., Which is in accordance with the zinc concentration of 0.1 to 3 wt,% in the original steelmaking ash More obvious increase. < However, the aforementioned technique has problems under K. There is only one dust collector 1 3. The zinc-containing furnace ash collected by the dust collector 1 3 is again made in its entirety. The standard is Nine Standards. Applicable to China National Standard (CNS) A4 (210X 297 mm) _ r — (Please read the precautions on the back before filling in (This page)

517093 A7 B7 5. Description of the invention (4) grains. This re-granulated ash is added to the molten iron hopper. This step is repeated 2 to 3 times until the zinc concentration in the ash reaches the target value. Analysis of the ash treated in this way shows that if the average zinc concentration of the entire ash does not reach the standard value, even if a part of the ash has been concentrated to a high concentration, the entire ash must be re-granulated and reprocessed in a molten iron hopper Move to the original. As a result, processing costs and the time required for granulation, processing, and relocation will increase. In addition, the increase in the amount of re-processed ash also increases the investment in recycling zinc | fl. Since the processing device processes the ash several times, the required specifications of the device for the amount of steel ash to be processed become larger. In addition, this device stops the operation of the treated ash when it reaches the specified concentration, and restarts the operation with new raw materials. That is, the device is operated in batch mode and the efficiency is not good. Summary of the invention An object of the present invention is to efficiently and economically recover zinc oxide from furnace ash. In order to achieve this object, the present invention first provides a method for recovering zinc oxide, which includes the following steps: (a) agglomerates the ash; (b) adds the condensate to the molten iron in the melting furnace; the center of the Ministry of Economic Affairs Printed by the Consumer Bureau of Standards Bureau (please read the notes on the back before filling this page) (e) Collect the flue ash from the melting furnace; (d) Recycle the first collected ash; And (e) recovering the second collected ash. In step (a), a furnace ash containing iron oxide and zinc oxide is aggregated to form an aggregate. In step (b), the agglomerates are added to the molten iron in the melting furnace. Iron oxides and zinc oxides in the agglomerates are selected from the fused iron. Qianyuan's iron is approved to the standard of China National Standard (CNS) A4 (210X297 mm) n 517093 Printed by the Shellfish Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs A7 B7 V. Invention Description (5) Collected in molten iron . The zinc in Qianyuan evaporated into zinc oxide. The melting furnace discharges ash containing zinc oxide. In step (C), the ash containing zinc oxide and discharged from the melting furnace is gradually collected in order from a large particle size. The number of preferred stages of dust collection is three. The first stage is mainly collecting the ash with a particle size of 10 iu ηM from the zinc oxide-containing ash discharged from the free melting furnace. The second stage continues the first stage and collects ash with a particle size of 5 μm. The third stage is mainly followed by the second stage to collect furnace ash with a particle size of 0.1 w ϊπK. In step (d), the first collected ashes containing less than the specified concentration of zinc oxide in the collected ashes are recycled to the agglomeration step (a). In step (e), a second ash containing zinc oxide at a specified concentration K in the collected ash is recovered as a source of zinc. Secondly, the present invention provides a device for recovering zinc oxide, comprising: an agglomerating unit for agglomerating the furnace ash containing iron oxide and zinc oxide to form agglomerates; adding the agglomerates therein and containing molten iron Ash melting furnace; K and dust collector components that sequentially collect zinc oxidized flue furnace ash generated from the melting furnace from a large particle size in order. Thirdly, the present invention provides a method for recovering zinc oxide, which comprises the steps of: U) mixing a carbonaceous material used in the original process with a furnace ash containing iron oxide and zinc oxide to produce a mixture; ( b) agglomerates this mixture to form agglomerates; this 九 9 & standard Chinese national standard (CNS) A4 specification (210X297 mm) ~ only-(Please read the precautions on the back before filling this page) I- Equipment, 1T 4 517093 A7 B7 V. Description of the invention (6) (c) Add the condensate to the melting furnace, K will move the oxide of iron and zinc oxide to the original in the molten iron, so the selected iron enters In the molten iron, the reduced zinc evaporates into zinc oxide, and a zinc oxide-containing flue ash is generated from the melting furnace; (d) drawing the zinc oxide-containing flue ash generated from the melting furnace. In the agglomeration step of the above process, the amount M of the carbon-containing substance is preferably equal to 1.5 to 10 times the stoichiometric ratio of the iron oxide and the osmium oxide present in the furnace ash. It is also preferable to mix furnace ash containing iron oxide and zinc oxide with carbonaceous material K and hydraulic additive for relocation, and to agglomerate the mixture. The hydraulic additive is added to the ash so that a slag having a basicity (Ca0 / Si02) of 0.5 to 1,5 is formed in the melting furnace. The addition of agglomerates to the molten iron is preferably performed at a feed rate ranging from 0.2 to 1 ton / hour (the cross-sectional area of a melting furnace of square meters). Fourthly, the present invention provides a device for recovering zinc oxide, the device comprising: a reaction furnace for adding condensate therein to contain molten iron; a heating member for heating the molten iron contained in the reaction furnace; Stirring member for molten iron in the reaction furnace; K and a recovery member for recovering zinc oxide generated in the reaction furnace. Printed by the Consumers' Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs (please read the precautions on the back before filling out this page) This heating element and stirring element are preferably at least two heating burners located on the upper part of the reaction furnace. On a horizontal plane, the at least two heating burners are positioned at an angle ranging from 50 to 80 degrees with respect to the radial direction of the reaction furnace. In a vertical plane, the at least two heating burners are positioned at an angle ranging from 20 to 45 degrees with respect to the horizontal plane. It is preferable that the agitating member M is located in the storage portion of the melting furnace. Through this agitating member, a stirring gas is injected into the molten iron at a rate of M 2 to ONIN 3 / hour per ton of molten iron. This & & standard is Chinese National Standard (CNS) A4 (210X297 mm) __ q — printed by the Consumers' Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs 517093 A 7 B7 5. Description of the invention (7.) Description FIG. 1 is a schematic diagram illustrating a specific example of a method for recovering zinc oxide according to the present invention. FIG. 2 is a graph showing the particle size distribution of raw furnace ash and raw furnace ash. Fig. 3 is a graph showing the particle size distribution of the ash collected by the dust collector. FIG. 4 is a schematic diagram illustrating a conventional method for recovering zinc oxide from steelmaking ash. Fig. 5 is a schematic diagram illustrating another specific example of the method for recovering zinc oxide according to the present invention. Fig. 6 is a schematic diagram illustrating a specific example of an apparatus for recovering zinc oxide according to the present invention. Fig. 7 is a diagram showing the angle of the burner of the device on the zinc recovery unit according to the present invention. Fig. 8 is a schematic diagram illustrating a specific example of another apparatus for recovering zinc oxide according to the present invention. DESCRIPTION OF SPECIFIC EXAMPLES SPECIFIC EXAMPLE 1 Figure 2 shows the particle size distributions of several types of steelmaking furnace ash according to the specific samples of the present invention. The particle size distribution from the coarse particle size is in order: blast furnace ash, converter ash, and electric furnace ash. This figure also shows that the agglomerates are generated by the ash from the steelmaking furnace, the agglomerates are added to the molten iron contained in the melting furnace, and the iron oxides and zinc oxide in the agglomerates are selected from the molten iron. The particle size distribution of the obtained ash, the ash K thus produced is hereinafter referred to as "reducing ash". The particle size range of the blast furnace ash is 5 to 3 OU / im, the particle size range of the converter ash is 1 to 100 μin, and the particle size range of the electric furnace ash is 1 to 20 μm. The selection scale is suitable for A Chinese National Standard (CNS) A4 specification (210X297 mm) _] Π _ ---------- Approval of clothes ------ order ---- · 1 ---- 1 (Please read the notes on the back before filling out this page) Printed by the Employees' Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs 517093 A7 B7 V. Invention Description (8) The particle size range of the original furnace ash is from 0.1 to 5 μm, and The average particle size is approximately 1, 5 u. In general, smaller particle sizes will result in higher zinc concentrations. Analysis of the zinc concentration of each particle size level of the upper oven ash showed that for various furnace ash, particles having a size under 5 μmK showed a high zinc concentration. In particular, the original furnace ash was selected, and the scanning electron microscope was used to observe particles of different sizes and identified by 1 M X-rays. As a result, particles having a size at 5 μmM contained a large amount of zinc oxide, and many particles having a size above 5 μK were oxides of iron. Quantitatively, particles with a size under 5 μ appeared to have a zinc concentration higher than 50 w t.%. Therefore, a plurality of dust collectors each having different particle size separation performance or separation properties at different particle sizes are installed through the exhaust pipe 出口 at the outlet of the melting furnace, and are collected to have different zinc oxides from each other in the generated ash. The concentration of the original furnace ash. The beryllium type method can select the ash with the target zinc concentration, so the collected ash with high zinc concentration can be discharged to: the outside of the system and supplied to the zinc smelter. The collected zinc ash with low zinc concentration is re-agglomerated and added to the melting furnace to establish a continuous recirculation system. Therefore, when the steel-making ash is agglomerated and added to the molten iron in the melting furnace, the ash The iron oxide is selected from the molten iron and collected in the molten iron. The zinc oxide in the ash is relocated and evaporated, and is discharged to the outside of the melting furnace with the zinc oxide ash. In that case, a part of the zinc-containing furnace ash added was shattered due to the thermal shock caused by molten iron, and K was not selected as the original large particles (5 y discharged to the outside of the system. The concentration of zinc in the original furnace ash must be reduced in coarse, unreduced furnaces. The size of the wood paper is suitable for 3 Chinese national standards (CNS > A4 size (210X297 mm)) _!! — ΛΚΜΒβκ ϋϋ ·· i · — 1_1_1 II — ^ ϋ VV mmmrnm wmmmmrn (Please read the precautions on the back before filling this page) 517093 A7 B7 V. Description of the invention (9) The amount of ash particles. However, because the generation of unreacted ash cannot be completely prevented, The reduction ash and the original ash are collected separately. After only having a low zinc concentration, the ash is recondensed and added to the melting furnace for priming. On the other hand, a fine furnace containing zinc at a specified concentration K The ash particles can be supplied to the smelter as a source of zinc without further processing. Therefore, the present invention adopts a method and device for recovering zinc shown in FIG. 1. The zinc oxide-containing smelting process stored in the ash hopper 21 of the furnace is used. Steel furnace ash 22 in the mix Machine 27 is thoroughly mixed with coke 24 for reduction stored in coke hopper 23 and binder 26 stored in binder hopper 25. This mixture is formed in a coalescing unit 28 to have a diameter of 15 to 30 臓 and 10 to 20 brain thick coal briquette-shaped aggregates. Then the M meter feeder 30 adds the aggregates to the melting furnace 31 via the intermediate hopper 29. From the viewpoint of increasing the migration rate It is better to add carbonaceous substances, such as coke used to migrate zinc oxide and iron oxides to the agglomerates. This agglomeration unit can be a so-called granulator. The melting furnace 31 can be melted by induction heating. Furnace, and can be other types of furnaces, such as arc heating furnaces and gas heating furnaces ° Printed by the Consumers' Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs --------- 0 ^^ —— (Please read the back Note: Please fill in this page again.) 4 The melting furnace contains molten iron 32 at a temperature of 1 400 to 1 600 ° C. Since the added aggregate 33 has a specific gravity in the range of 1.2 to 2.5 g / on 3, it is lower than the melting temperature. The specific gravity of iron 3 2 is condensed into layers on the surface of molten iron. The oxides of iron are mainly migrated by the carbon in the condensate, and become iron rain spreads in the molten iron. Zinc oxide is reduced by the carbon and other elements in the condensate, and is evaporated and oxidized by the oxygen in the furnace. Therefore, fine zinc oxide particles having a size of 10 / im Μ, and most of which are under 5 α in κ are generated. The size of the mound paper is applicable to the Chinese National Standard (CNS) A4 specification (210 X 297 mm) —, a _ 517093 Printed by A7 B7, Central Consumers ’Cooperative of the Ministry of Economic Affairs, B7 V. Description of the invention (speaking) On the other hand, a part of the condensate in the zinc-containing furnace ash was degraded by the thermal shock of molten iron, and κ has not moved The status is excluded from the system. This unreduced ash has a particle size mainly on 5 μααK. Some iron oxides are also discharged outside the system. The ash generated by the melting furnace 31 is collected by the first dust collector 34, the second dust collector 35, and the third dust collector 36 through a duct 31b connected to the furnace cover 31a. The ash is sucked to the dust collector through the exhaust fan 37. From the viewpoint of accelerating the evaporation of zinc, it is better to select the capacity of the exhaust fan 37 to have sufficient capacity to reduce the internal pressure of the melting furnace to the atmospheric pressure K. In this specific example, the separation limit particle size in each dust collector is set as follows, although this limit particle size can be adjusted in response to the particle size distribution of the original furnace ash. The first dust collector: lOiUIB, the second dust collector: 5 iU ffl, the third dust collector: O.liuin, that is, the collector is designed to collect 10 M m or coarser particles for the first dust collector. 1 // m particle size ash. The second dust collector collects ash with a particle size of 10 to 5 / im, and the third dust collector collects ash with a particle size of 5 to 0. 1 // m. Specifically, the first dust collector 34 of this specific example is a general type cyclone separator, the second dust collector 35 is a high-efficiency cyclone separator, and the third grate dust collector 36 is a bag type. Filter type dust collector. Figure 3 shows the particle size distribution of the ash collected by each dust collector. The result obtained is almost the same as the designed collection performance. Table 1 shows the composition of the ash recovered from each dust collector. Since this specific example sets the target zinc concentration to 50% Μ, the size of the gravel drink collected by the third dust collector 36 will apply the Chinese National Standard (CNS) A4 specification (210 × 297 mm), 0 (Please read the precautions on the back before filling out this page)

Ji 1’_ 517093 A7 B7 V. Description of the invention (u) The furnace ash is stored in the hopper 38. Table 1 Zπ Fe Other (0, etc.) First dust collector 28 38 34 Second dust collector 31 34 35 Third dust collector 55 4 41 (w t.  %) The zinc concentration in the ash collected by the first dust collector 34 and the second dust collector 35 is 2 8 w t.  % And 3 1 w t.  %, So both are below the target zinc concentration (50wt1). Therefore, this ash is recycled to the ash hopper 21 through the recirculation pipe 40. The recycled ash 41 is re-granulated in the coalescing unit 28, and then added to the agglomeration furnace 31 and moved to the original molten iron 32. The weight ratio of the ashes collected in each of the three dust collectors (first, second, and third) is approximately 2: 3: 5. Printed by the Consumers' Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs (please read the precautions on the back before filling out this page). As the above specific example produces a more standard value in the ash collected by the second dust collector 3 5 Because of the low zinc concentration, this ash is recycled to the ash recycling piping 40. However, if the zinc concentration of the ash exceeds the standard value, this procedure can switch the ash discharge pipe system at the exit of the second dust collector 35 to the path for sending the ash to the product hopper 38. In this way, the amount of recycled ash can be kept to a minimum. Therefore, high-zinc ash can be efficiently recovered. The recovered ash is agglomerated by the agglomeration unit 39 and then supplied to the smelter. The smelter uses this supplied furnace ash as the zinc source M to make zinc. According to the present invention, as previously explained, the oxide of iron containing zinc is a national standard (CNS) A4 specification (210X297 mm) of condensed HI ruler-printed by the Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs 517093 A 7 B7 5. Description of the invention (12), and add the agglomerates to the molten iron in the melting furnace, M to migrate and evaporate the zinc oxide in the ash, and then recover zinc vapor in the form of zinc oxide. In this procedure Among them, the zinc collection unit that collects zinc from the furnace ash includes at least two dust collectors, each of which has a different size separation limit, so the zinc concentration in the furnace ash can be increased, and at the same time, it will contain zinc that is lower than the standard value. The ash is recycled again to the required processing piping system. When the zinc concentration in the ash is higher than the standard value, the ash is supplied to the zinc smelter without further processing. Therefore, the self-smelting furnace The process of recovering zinc from ash is more efficient and economical than the conventional method. The method according to the present invention can be applied not only to steelmaking furnace ash, but also to zinc-containing iron oxides, or sintered ores and Iron ore with zinc concentration. Method 2 Separately granulating the steelmaking furnace ash and the carbon-containing material used for relocation, and adding them to the melting furnace separately, it may not necessarily make the selection of the zinc oxide in the furnace ash stable and rapid. In accordance with the present invention, the zinc oxide-containing furnace ash is mixed with the carbonaceous material used for the original selection to agglomerate together, and this aggregate is added to the molten iron in the melting furnace (containing 2 to 4wt. 纟 of carbon). The added agglomerates were deposited in layers in the melting furnace. The accumulated agglomerates are heated by the molten iron in the melting furnace, and through the carbonaceous matter in the agglomerates, starting from the lowermost agglomerate layer, the migration of iron oxides and zinc oxide in the agglomerates is continuously triggered. . In other words, the oxidation # in the furnace ash is rapidly relocated by the adjacent carbonaceous materials to generate zinc vapor, and then this vapor is immediately re-oxidized in the high oxygen partial pressure space of the upper part of the melting furnace, and the oxidation products are recovered as With high concentration, this standard is applicable to China National Standard (CNS) A4 specifications (210X297 mm) _ τ "— (Please read the precautions on the back before filling this page) -ϋ · mmmmmmmmt 1 ··· ——« Hi · —ami 111 T y 11 am tmMmmmmmm · 1 ϋϋ · _ · 517093 A7 B7 V. Description of the invention (13) Zinc oxide ash. As a result, the processing capacity of the steelmaking ash was significantly increased according to the method of the present invention. The melting furnace needs to maintain the endothermic reaction and maintain a molten iron temperature of about 150 ° C. Therefore, it is necessary to supply heat to the melting furnace. Any method of supplying heat can be used, including induction heating, arc heating, and Gas heating. Among various methods of supplying heat, induction heating is a relatively simple and easy heating method. Regarding carbonaceous materials, coke powder and petroleum coal coke can be used. For example, if the mixing ratio of the original carbonaceous materials is less than first The specified standard will reduce the rate of migration reaction, and the proportion of unreduced ash will increase. However, if the mixing ratio of carbonaceous materials exceeds the standard specified on K, excessive carbonaceous materials will enter the solvent In the slag, the molten slag foams, and the excessive carbonaceous material will not promote the reduction reaction. Regarding the amount of carbonaceous material added to the agglomerate, the insufficient mixing ratio of carbonaceous material for reduction will cause the original zinc oxide Insufficient carbonaceous substances are used to limit the concentration of zinc oxide in the generated ash. According to the invention, printed by the Consumer Cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs (please read the precautions on the back before filling this page) It was confirmed that by selecting the mixing ratio of the carbonaceous substances in the furnace ash as the stoichiometric ratio required to select the original zinc oxide and iron oxide 1.  5 to 10 times, the exogenous reaction can be performed quickly and stably. In the ash coalescence stage, hydraulic additives are added to the ash as a binder. This hydraulic additive is a material containing Ca 0. The use of hydraulic additives makes cohesion easy and economical. Although a small amount of slag components, such as silica and alumina, are present in the ash, these components are dissolved and appear between the unreacted agglomerates and the surface of the molten iron. When the fluidity of the resulting slag becomes worse, the Chinese paper (CNS) A4 specification (210X297 mm) has not been applied to the paper size. 印 Printed by the Consumer Cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs 517093 A 7 _ B7__ V. Description of the invention (14) The chance of the condensate of the application contacting the molten iron becomes lower, and the rapid progress of the selection reaction is suppressed. In this regard, the method according to the present invention uses an additive containing ca 0 as a hydraulic additive, and M sets the alkalinity (C a 0 / S i 0 2) of the resulting slag from 0 · 5 to 1 ♦ Within the range of 5, it is more preferably from 1, 0 to 1, 2 and the melting point of the molten slag is set at 150 ° C Μ to ensure the fluidity of the molten slag. The preferred hydraulic additive is Portland cement having an alkalinity of about 2, and having a basicity of about 1.  Blast furnace granular slag with alkalinity of 5. The mixing ratio of hydraulic additives depends on the composition of the ash. The shape of the agglomerates can be granular or briquette. The granules obtained by the general granulation mechanism are quite spherical, which is convenient for conveying and feeding. The migration reaction of zinc oxide in the ash mainly occurs at the interface between the surface of the molten iron and the agglomerates deposited on the molten iron. Therefore, the amount of ash to be added should depend on the cross-sectional area of the melting furnace on top of the molten iron on which the agglomerates are accumulated. According to the present invention, solubility tests show that the appropriate feed rate range for the agglomerates ranges from (K 2 to 1.  0 t / h, m 2. The feed rate of the agglomerates exceeding the above range will cause unreacted agglomerates to gradually accumulate on the surface of the molten iron, thereby increasing the thickness of the agglomerates. When the thickness of the agglomerates increases, the selection rate of the agglomerates in the upper part of the accumulating layer will be blocked by the lower part of the agglomerating layer due to the radiant heat emitted from the molten iron, resulting in insufficient heat supply and reduced, which will cause the reaction rate. Inhibition and reduction of original selection speed. According to the present invention, the ash produced by the melting furnace has a small particle size and contains significantly higher concentration stones than the steelmaking ash used as a raw material for condensate: the grave scale is applicable to the Chinese National Standard (CNS) A4 specification (210X297mm) ι 7----------- " equipment ------ order " " " „---_---- (Please read the first Note: Please fill in this page again.) 517093 Printed by the Consumer Cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs A7 B7 V. Invention Description (15) Zinc. The blast furnace ash also has a high zinc concentration in some small particles, The particles mainly contain iron ore. That is, the small particles of the steelmaking furnace ash have a high zinc concentration. Therefore, two dust collectors on the M are used to collect the ash from the Shangliqian original process, and at the same time, the Classify and recycle the collected ash with lower zinc concentration to the treatment program, it is better to increase the zinc concentration in the ash. Example According to the method for recovering zinc from steelmaking ash according to the present invention, refer to FIG. 5 Illustrated below as an example. Figure 5 shows zinc recovery from furnace ash according to the present invention An example of a program drawing. The raw material ash 122 containing zinc and stored in the ash hopper 1 2 1 is mixed in the mixer 127 with the raw coke 124 and added to the coke hopper 125 and the binder hopper 125 The binder 126 in the medium is thoroughly mixed. This mixture is agglomerated in a briquetting machine 1 28 as a coalescing unit to form a briquette briquette having a size of approximately 15 to 30 fflin diameter and a thickness of 10 to 20 ΠΠΗ. The feeding device 130 adds coal bricks to the induction heating melting furnace 1 3 1 having a melting capacity of 1 ton through the intermediate hopper 129. The induction heating melting furnace 1 3 1 contains a temperature range from 1 4 0 0 to 16 0 0 ° C of molten iron 1 3 2. Since the proportion of coal bricks added is from 1.  2 to 2.  Within the range of 5 g / on 3, its proportion is lower than that of molten iron, so coal bricks are piled up on the surface of molten iron. The iron oxides in the coal bricks are mainly migrated by the carbonaceous substances in the coal bricks 133 and become iron and are collected in the molten iron. Zinc oxide is also migrated and evaporated by the carbonaceous materials in the coal bricks, and then this vapor is oxidized by the oxygen in the air entering the furnace through the air inlet. The air inlet is opened on the top of the induction heating melting furnace 1 3 1 1 a. This oxidizing vapor becomes a fine oxidizing of the size under 10 ^ ππK. Nine sheets of scale are suitable for 5 Chinese painting national standards (CNS) A4 specifications (210X297 mm) _ _ only _ (Please read the note 4 on the back before filling · Packing —: Write this page) Order-1¾ Printed by the Consumer Cooperatives of the Central Bureau of Standards of the Ministry of Economic Affairs 517093 A7 B7 V. Description of the invention (16) Zinc pellets. The fine zinc oxide particles pass through the duct 1 3 1 b and enter the dust collector. On the other hand, part of the coal bricks were smashed by the thermal shock of molten iron, and this part of the unreacted state was discharged out of the reaction system along with zinc oxide. A part of the iron oxide is also discharged from the surface of the molten iron to the outside of the reaction system. The discharged zinc oxide and unreacted agglomerates are collected by the first dust collector 134, which mainly collects ash with a particle size of 10 M m or more, and the second dust collector, which collects ash with a particle size of less than 10 μ Collector 135. Table 2 shows the composition of the ash collected by each dust collector. According to this embodiment, since the target zinc oxide concentration is set to 50% M, the ash collected by the second dust collector 135 is stored in the product hopper 137. Since the ash collected by the first collector 1 3 4 contains zinc having a lower concentration than the standard zinc, it is returned to the ash hopper 1 2 1 through the recycling pipe system 139. The recycled ash 1 40 is again coagulated with the raw material ash 1 2 2 in the coagulation unit 1 2 8. The ratios of the ash amounts obtained in the first and second dust collectors were 30 wt.  % And 70 w t.  %. By the above method, the ash with a high zinc concentration can be efficiently recovered by recycling the minimum required amount of ash. The recovered ash is coagulated in the coagulation unit 138, and then supplied to the smelter. The smelter processes this supplied ash as a source of zinc to produce zinc. ---------- install ------ order --_--- „---- (Please read the precautions on the back before filling out this page) Table 2 ZZ η Fe Others (〇, Etc.) First dust collector 31 34 35 Second dust collector 1 52 5 If 43 (wt ♦%) Wood paper scale. Applicable to China National Standard (CNS) A4 specification (210X297 mm) Printed by the Consumers' Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs 517093 A7 B7 V. Description of the invention (ir) As previously stated, according to the present invention, Zinc furnace ash is condensed, and the condensate is added to the molten iron in the melting furnace. The iron oxide in the furnace ash is selected and recovered in the molten iron, and the oxide in the furnace ash is oxidized. Zinc migrates and evaporates, and then this evaporated zinc is recovered as zinc oxide. In this method, the furnace ash containing zinc oxide is mixed with the carbonaceous material for reduction and coagulated together, and the aggregate is added to the molten iron in the melting furnace. Therefore, the high efficiency and high productivity are recovered High concentration of zinc. Because this device for recovering zinc from ash uses a relatively simple dust collector, the investment and operating costs are quite economical. Specific Example 3 According to the present invention, the ash system of the steelmaking furnace is mixed with the carbon used for relocation to aggregate them together, and the aggregate is added to the molten iron in the reaction furnace. The added agglomerates accumulated in layers in the reactor. After receiving the heat from the molten iron in the reaction furnace, zinc oxide starts from the lowest layer of the accumulated agglomerates and is migrated by the carbon in the agglomerates. This reduction is initiated in a reducing environment at a high ambient temperature above 1 000 ° C. Because the reaction rate is large at high ambient temperatures, zinc recovery needs to ensure high temperatures. However, when the steelmaking furnace ash is added to the molten iron, the sensible heat of the furnace ash and the reduction reaction of zinc oxide and iron oxides will reduce the temperature of the molten iron. In addition, the sensible heat of the exhaust gas and the heat dissipation of the reaction furnace also increase the heating loss, so that the temperature of the molten iron is significantly reduced. Therefore, unless a heating device is installed in the reaction furnace, it will be difficult to obtain a high temperature for zinc recovery. According to the present invention, a burner combustion unit is arranged on the upper part of the reaction furnace. The paper size is in accordance with the national standard (CNS) A4 specification (210X297 mm). N- MMmK§ ϋϋ «-am immtw atmmmmmmmw tmte Bui mtmmamim mamtMMmm mi V -1laaaw ··· μηκτι ·· (Please read the precautions on the back before filling in this page) 517093 A7 B7 V. Description of the invention (18), κ burns the coal bricks such as heavy oil or pulverized coal fired ash, κ The supply prevents the temperature of the molten iron from dropping, and performs continuous processing. The burner unit can be a known one, and a pulverized coal burner. Add to reaction. That is, the heat generated by the combustion of fuel is the heat such as furnace ash, the sensible heat of zinc oxide and exhaust gas, and the heat from the reaction furnace. For example, it is determined by thermal equilibrium as 9 0 0 M c a 1. When using heavy oil (calorific value, and when the effective utilization of the reaction is assumed to be 170 kg. In this case, 170 kg is injected for combustion in the reaction furnace. It should be treated continuously for 1 ton / hour. The generated combustion gas is the heat required to process it. This heat therefore makes steel ash a large amount of fuel such as heavy oil burners and propane burners. The amount of fuel is determined by thermal equilibrium. The heat system is equal to the treatment furnace. The heat of the iron oxide required by the ash is the heat of the exogenous reaction and the dissipation of heat. The heat required to process 1 ton of steelmaking furnace ash is about 10 7 0 0 kca 1 / kg) as the fuel rate is 50% ** The required fuel / hour of heavy oil from the burner unit will not cause the temperature in the furnace to be reduced, for example, electric furnace ash, and recycling please read the note first printed by the Ministry of Economic Affairs Central Standard Bureau employee consumer cooperative The solid iron M to the iron and gray iron " The surface melting of ad surface iron steel and the iron smelting product 1 is melted in agglomerates with the surface melting of slag iron. The U-shaped piles piled in the ash and the bricks in the upper furnace are melted to any pouring To cause the coal as the main product of the iron-based furnace may be such that the stack and should ,,. The anti-product or piece is added with the anti-doping method. The original poly-iron structure is added. The mixing and melting rate of the iron-iron is mixed with the fast-melting fused zinc. At the boundary of the factory furnace, the two relocated to the middle of the steel bracket. The zinc in the smelting ash room is not a furnace. Entering the market and expanding the boundaries of the material. The size of the certificate applies to the Chinese National Standard (CNS) A4 specification (210X297 mm). 21 Printed by the Consumers' Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs. 517093 A7 B7. According to the invention, it is possible to use additional components for stirring molten iron, such as a gas blowing unit using a porous brick or a spray gun. This gas blowing unit can be installed on the reaction; at the bottom, K stirs the molten iron from the bottom; or on the upper part of the reaction, K stirs the upper part. The stirring gas is mainly an inert gas such as nitrogen and argon. The amount of gas injected depends on the amount of molten iron. For example, in the case of using a bottom blowing unit to stir molten iron from the bottom side, the stirring test shows that the appropriate blowing rate is in the range from 2 to 10 N m 3 / hour per ton of molten iron. The gas injection nozzle used with the bottom blowing unit can be a porous brick or a small diameter tube. The front burner unit can be used as an alternative unit for stirring the condensate. That is, a plurality of burner combustion devices can be configured, and the flame of the combustion gas is blown to the condensate, so that the condensate accumulated on the molten iron rotates in the circumferential direction, so the improvement is caused at the interface between the molten iron and the condensate According to a series of basic tests, the appropriate number and appropriate inclination angle of the burner device used to generate the burner fire filling K rotating condensate is 2 to 4 burner devices and 50 to 80 ° The inclination angle Θ of the burner device with respect to the radial direction. Fig. 7 shows the inclination angle of the burner device. The structure of the burner depends on the viscosity of the molten iron in the reactor, the weight of the agglomerates, and the cross-sectional area of the reactor. C Another alternative unit for stirring molten iron is a machine maple stirring unit with multiple blades. By rotating the stirring unit in the molten iron, a circular lotus motion can be caused in the molten iron, thereby improving the reaction rate. : ^ Feet / {^ Chinese National Standard (〇 奶) 8 4 specifications (210 father 297 mm) -9 9-------- *-^-pack ------ order l ·- -: --- (Please read the notes on the back before filling this page) 517093 A7 B7 V. Description of the invention) Compared with the raw material condensate, the furnace ash collected from the relocation reaction obviously contains more A lot of zinc. However, the collected ash contains a part of the raw ash. The particle size of the raw furnace ash is above 10 a in M, and the zinc concentration is low. The part converted to zinc oxide contains a large amount of zinc, and the particle size of the part is less than 10 / i IB. To deal with this situation, install at least two dust collectors. The first dust collector collects ash with a particle size above 10 ^ ® M, and the second dust collector collects ash with a particle size below 10 a hi. In this way, the separation and collection of the ash by the particle size is based on the reaction zinc concentration. The collected ash M containing less zinc is returned to the processing ash for recycling, and it is better to increase the zinc concentration in the ash. According to the present invention, the agglomeration is performed by adding a hydraulic additive to the steelmaking ash. The agglomerates contain water from approximately 1 to 5 $. Therefore, if this condensate is added to the reaction furnace, heat K will be consumed to heat and evaporate the water. Therefore, the sensible heat of the gas discharged from the reaction furnace is used to improve the thermal efficiency of the entire processing apparatus. Printed by the Consumer Standards Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs (please read the precautions on the back before filling this page). That is, the temperature of the gas discharged from the reactor is about 300 ° C, and the amount of this exhaust gas It is proportional to the amount of ash during processing, or the amount of gas generated is 10, 0 0 0 N hi 3 per ton of processing ash. From the viewpoint of thermal efficiency, K sends this gas to the drying and preheating unit of the condensate, and it is better to perform direct or indirect drying and preheating. Example A method for recovering zinc from furnace ash according to the present invention will be described below with reference to Fig. 6 as an example. The steelmaking furnace containing zinc and stored in the ash hopper 2 2 1 is a national standard (CNS) A4 specification (210X297 mm) of a suitable country (10x — 517093 A7 B7) V. Description of the invention The ash 222 is thoroughly mixed in the mixer 227 with the original coke 224 stored in the coke hopper 2 23 and the binder 226 stored in the binder hopper 225. This mixture is coalesced in coalescing unit 228 into coal briquettes having a size of approximately 15 to 30 mm in diameter and 10 to 20 feet in thickness. The coal bricks are dried and preheated in a drying and preheating unit 229 by exhaust gas 23 8. After heating, the coal bricks are added to the reaction furnace 2 3 2 through the intermediate hopper 230 using a metering feeder 231. The reaction furnace 2 3 2 contains molten iron 2 3 3 at a temperature range from 1 400 to 16 0 ° C. Due to the addition of coal bricks, the proportion of 2 3 4 is from 1 * 2 to 2.  In the range of 5 g / απ 3, the proportion is lower than that of molten iron, so coal bricks are piled up on the surface of molten iron. In order to prevent the temperature of the molten iron from decreasing, four burner combustion devices 2 3 5 are arranged above the reaction furnace 2 3 2 at an inclined angle with respect to the radial direction. Through this burner combustion device 2 3 5, heavy oil is discharged and burned. The power of the burner flame moves the coal bricks deposited on the molten iron surface, increasing the reaction rate. A bottom gas blowing unit 2 3 6 is provided at the bottom of the reaction furnace. * Via this unit, nitrogen 2 3 7 is injected into the molten iron and stirred. K further increases the reaction rate. The central government bureau of the Ministry of Economic Affairs has printed bags for consumer cooperatives (please read the precautions on the back before filling this page). To prevent the temperature of the molten iron from decreasing, the upper part of the reactor 2 3 2 is inclined at an angle with respect to the radial direction. Burner burning device 235. Through this burner combustion device 2 3 5, heavy oil is discharged and burned. The power of the burner flame moves the coal bricks deposited on the molten iron surface, increasing the reaction rate. A bottom gas blowing unit 2 3 6 is provided at the bottom of the reaction furnace, and nitrogen 2 37 is injected into the molten iron through the unit to stir it, and the reaction rate is further increased. This paper size applies Chinese National Standard (CNS) A4 specification (210X297 mm) 〇 _ 517093 A7 B7 V. Description of the invention (22) The iron oxides in the furnace ash are mainly relocated to the carbonaceous substances in the coal bricks. It becomes iron and is collected in molten iron. Zinc oxide is also selected and evaporated by the carbonaceous material in the furnace ash, and then this vapor is oxidized by oxygen in the air entering the furnace through the air inlet. The air inlet is opened above the reaction furnace 2 3 2. This oxidizing vapor turns into fine zinc oxide particles with a particle size of 10 a m. On the other hand, a part of the zinc-containing furnace ash as a raw material for agglomeration was degraded by thermal shock, and this part was discharged to the outside of the reaction system in an unreacted state. The turbulent particles of the dust, unreacted furnace ash, and iron were collected by the furnace ash with a particle size of 10uniM, which was the first cyclone separator 2 39 of the dust collector, and collected with a particle size of 10 w mM. The ash is collected as a cyclone 240 as a second dust collector. Table 3 shows the composition of the ash collected by each dust collector. According to this embodiment, since the target zinc oxide concentration is set to 50 ¾ ^, the ash collected by the second dust collector 240 is stored in the product material 4 241. Printed by the Consumers' Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs (please read the precautions on the back before filling this page). Since the ash collected by the first dust collector 239 contains zinc with a lower concentration than the standard zinc, The pipe system 2 4 4 is circulated and returned to the ash hopper 2 2 1. The recycled ash 2 4 5 is coagulated again with the raw ash 2 2 2 in the coagulation unit 2 2 8. The agglomerates were added to the reaction furnace 2 3 2 and subjected to reduction treatment on the molten iron 2 3 3. By the above method, the ash with a high zinc concentration can be efficiently recovered by recycling the minimum required amount of ash. The recovered ash is coagulated in the coagulation unit 242 and then supplied to the smelter. The smelter processes this supplied ash as a source of zinc to produce zinc. Table 3: I · — Zn | He (0, ϊ ~ ί " Γ human melon scale is applicable to 0 Chinese standards (CNS) Α4 specifications (210X297 mm) _ 〇r — 517093 A7 B7 Staff Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs Printed 5. Description of the invention (23) First dust collector 28 38 34 Second dust collector 55 4 41 (wt.  I) As described above, the device according to the present invention performs the processing steps under M; agglomerates the ash containing zinc and mainly composed of iron oxides; adds the agglomerates to the molten iron in the reaction furnace; In iron, iron oxides in the furnace ash are reduced, and K is collected in the molten iron; and zinc oxide in the original and evaporation furnace ash is selected. K recovers the evaporated zinc from the form of zinc oxide. Because this device is provided with a burner combustion unit for heating and stirring the furnace ash, it can prevent the temperature of the molten iron from decreasing, and it is provided with a stirrer for stirring the molten iron, and it is also provided with κ from coarse particles to the bundle Particles sequentially collect more than two dust collectors of furnace ash, so it can recover high concentration zinc with high efficiency and high productivity. Specific Example 4 According to the present invention, a zinc-containing steelmaking furnace ash system is mixed with carbon used for relocation, such as coke powder, and the mixture is coagulated. The agglomerated material was added to the molten iron in the melting furnace. The added agglomerates accumulated in layers in the melting furnace. The accumulated agglomerates are subjected to heat from the molten iron in the melting furnace, and from the lowermost agglomerate layer, the migration of carbonaceous substances in the zinc oxide agglomerates in the ash is continuously initiated. In other words, the zinc oxide in the ash is rapidly relocated by the adjacent carbonaceous material to generate zinc vapor, and then this vapor is immediately re-oxidized in the high oxygen partial pressure space of the upper part of the melting furnace, and the oxidation product is recovered as Furnace ash with high concentration of zinc oxide. On the other hand, the iron oxides in the furnace ash are reduced. The paper size applies the Chinese National Standard (CNS) A4 specification (210X297 mm)-9 α--------. -^-装 ------ Order l · --r --- (Please read the notes on the back before filling out this page) 517093 A 7 B7 V. Description of the invention (24) Collected as iron Iron inside. Since the increased amount of slag and molten iron caused by the above-mentioned ash treatment method can be discharged from the reaction system at any time through the inclined melting furnace or other methods, as long as there is an appropriate amount of melting in the melting furnace Iron can maintain continuous processing. The generated molten iron can be added to the electric furnace and reused as the raw material for ironmaking. At the same time, it will cause a small amount of heat loss, which is dissipated to the reaction: the heat outside the system. According to the present invention, the arc heat generated by the electrode unit is used to maintain the high temperature required for the ash treatment. The power input to the electrode unit is determined by thermal equilibrium. That is, the power applied to the electrode unit is equal to the heat required to process the ash, which is the sum of the heat losses such as the sensible heat of the exhaust gas and the heat dissipation from the melting furnace, the sensible heat of the ash, and zinc oxide. The heat of reaction with iron oxide's exogenous reaction. For example, the power required to process 1 ton / hour of ash in a melting furnace is 700 K w h (仟 W. Hours) plus the external heat loss of 2 500 Kw h, which adds up to 3 2 0 0 K w h. For example, the size of the melting furnace is 2.  6 m, height 2 * 8 m, and has a molten iron capacity of 1,000 tons, and the furnace ash processing rate is 1 ton / hour. Printed by the Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs (please read the precautions on the back before filling this page). The exogenous reaction of zinc oxide in the furnace ash mainly occurs between the surface of the molten iron and the condensate accumulated on the molten iron. Interface. Therefore, the member for stirring the agglomerates K accumulated on the molten iron to promote mixing on both sides of the interface can increase the migration reaction rate occurring at the interface between the agglomerates and the molten iron, thereby increasing the ash yield. According to the present invention, a gas blowing unit is installed in a melting furnace. This gas blowing unit can be installed at the bottom of the melting furnace, and K is stirred from the bottom side by molten iron; Cooperative printed A7 _ B7___ V. Description of the invention (25) It is installed on the upper part of the melting furnace, and M stirs the upper part of the molten iron. The stirring gas is mainly an inert gas such as nitrogen and argon. The amount of gas injected depends on the amount of molten iron. For example, in the case of using a bottom blowing unit to stir molten iron from the bottom side, the stirring test shows that the appropriate blowing rate is from 0.  In the range of 1 to 2 N in 3 / hour per ton of molten iron. The gas injection nozzle used with the bottom blowing unit can be a porous brick or a bundle of small diameter tubes. An alternative unit for stirring molten iron is a machine maple stirring unit with multiple blades. By rotating the stirring unit in the molten iron, a circular motion can be caused in the molten iron, thereby improving the reaction rate. The M lit method can individually control the heat required for the reaction and the stirring force required for the molten iron on individual variables, so the reduction treatment of the ash can be effectively performed. According to the present invention, the agglomeration is performed by adding a hydraulic additive to the steelmaking ash. This coal briquette contains water from about 1 to 5¾. Therefore, if this agglomerated coal brick is added to the melting furnace, heat M will be consumed to heat and evaporate the water. Therefore, the sensible heat of the gas discharged from the melting furnace is used to improve the thermal efficiency of the entire processing equipment. That is, the temperature of the gas discharged from the sample furnace is about 3 ο ου κ, and the amount of this exhaust gas is proportional to the amount of processing ash, or the amount of gas generated is 10 per ton of processing ash, 0 0 0 N m 3. From the standpoint of thermal efficiency, this gas is sent to the drying and preheating unit of coal bricks as agglomerates for direct or indirect drying and preheating. The ash produced by the melting furnace obviously contains a larger amount of zinc than the agglomerates used as raw materials. However, this ash contains a part of the self-melting furnace ϋϋ / Σϋ Chinese National Standard (CNS) A4 specification (210X297 mm) -〇8-(Please read the precautions on the back before filling this page), ----- -II Order ~ r--r I--I --- l · Printed by the Consumer Cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs 517093 A7 B7 V. Description of the invention (26) Raw material condensate discharged. The particle size of the raw material agglomerates is generally above 10 μm, and the zinc concentration is private. The zinc oxide-containing portion produced by transforming the original zinc generally has a particle size of less than 10 Zi m and contains a large amount of zinc. To deal with this situation, install at least two dust collectors. The first dust collector mainly collects ash with a particle size of 10 a mM, and the second dust collector mainly collects ash with a particle size of 0, 1 // π K. In this method, the separation and collection of furnace ash by particle size is based on the reaction zinc concentration. The collected ash containing less zinc is returned to the processing ash for recycling, and K increases the zinc concentration in the collected ash. A suitable type of that type of collector is a cyclone. Example An apparatus for recovering ash from the ash according to the present invention is described below as an example with reference to Fig. 8. Fig. 8 is a flow chart of an apparatus for recovering zinc from furnace ash according to the present invention. The raw material furnace ash 3 2 2 containing zinc and stored in the furnace hopper 3 2 1 is stored in the mixer 327 and stored in the coke hopper 323. The original coke 324 was thoroughly mixed with the binder 3 2 6 stored in the binder hopper 3 2 5. This mixture is coalesced in coalescing units 3 2 8 to form coal briquettes with a briquette size of approximately 15 to 3 Ornii! Diameter and a thickness of 10 to 20 min. The condensate is dried and preheated in the drying and preheating unit 329 by exhausting 3 3 9, and then the condensate is added to the melting furnace 3 3 2 through the intermediate hopper 3 3 0 using the metering feeder 3 3 1. The melting furnace 3 3 2 contains molten iron 3 3 3 at a temperature range from 1 400 to 16 0 ° C. Since the proportion of 3 3 4 added coal bricks is at 1.  2 to 2.  In the range of 5 g / os 3, it is lower than the proportion of molten iron 3 3 3, so the paper size of coal bricks. Applicable to China National Standard (CNS) A4 (210X297 mm) _ 2 q _ ϋ- am ϋ_ϋ 11 -ι_ιϋ ϋϋ ϋ —ϋ -ϋϋ m ϋϋ ml- * · ν 1- ^ 1 mi n ^ i > ϋϋ I (Please read the precautions on the back before filling out this page) Printed by the Employees' Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs 517093 A7 B7 V. Description of the invention (Pair) The layers are deposited on the surface of molten iron. In order to prevent the temperature of the molten iron 3 3 3 from being lowered, an electrode unit 3 3 5 is disposed above the melting furnace 3 3 2, thereby generating an arc and supplying the arc heat to the melting furnace 3 3 2. A bottom gas blowing unit 3 37 is set at the bottom of the melting furnace, and nitrogen 338 is injected into the molten iron through this unit to stir it, and the reaction rate is further increased. The oxides of iron in the ash are mainly migrated by the carbonaceous materials in the coal bricks, and become iron and are collected in the molten iron. Zinc oxide is also migrated and evaporated by the carbonaceous material in the ash, and the vapor is oxidized by oxygen in the air entering the furnace through the air inlet. The air inlet is opened above the melting furnace 332. This oxidized vapor becomes a bundle of zinc oxide particles having a size below 10 // m. On the other hand, a part of the zinc-containing furnace ash as a raw material for agglomeration was degraded and crushed by the thermal shock of molten iron 3 3 3, and this part was discharged to the outside of the reaction system in an unreacted state. A part of the iron oxide is also discharged from the surface of the molten iron to the outside of the reaction system. The exhausted zinc oxide particles, unreacted ash, and iron are collected by the dry cyclone as the first dust collector 340, and the collection dust is less than 10%. The α π particle size ash is collected as a dry cyclone of the second dust collector 341. Table 4 shows the composition of the ash collected by each dust collector. According to this embodiment, since the target zinc oxide concentration is set to 50% M, the ash collected by the second collector 341 is stored in the product hopper 342. Because the ash collected by the first dust collector 340 contains zinc with a lower zinc concentration than the standard, it is returned to the ash paper size through the recycling pipe system 345. Applicable to China National Standard (CNS) A4 specification (210X297 mm) ι ^ ϋ ϋϋ- (Please read the notes on the back before filling out this page) 517093 A7 B7 V. Description of the invention (28) Material 4 321. The recycled ash 346 is coagulated again with the raw ash 3 2 2 in the coagulation unit 328. The agglomerates were further charged into the melting furnace 3 3 2 and subjected to reduction treatment on the molten iron 3 3 3. By the above method, the ash with a high zinc concentration can be efficiently recovered by recycling the minimum required amount of ash. The recovered ash is coagulated in the coagulation unit 343 and then supplied to the smelter. The smelter processes this supplied ash as a source of zinc to produce zinc. ------- r--Ι ^ Γ Installation-(Please read the notes on the back before filling this page) Table 4 ZZ π Fe Other (〇, etc.) The first dust collector 31 34 35 The second collector 52 5 4 3 (wt ♦%) printed by the Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs as described above. The device for recovering zinc oxide according to the present invention includes: a melting furnace, which is mainly made of iron. The agglomerated steelmaking ash composed of oxides is added to the molten iron, and the iron oxides M of the original ash in the molten iron are collected in the molten iron * and the zinc oxide in the original ash is evaporated and evaporated ; K and components for collecting zinc in furnace ash. In addition, since this device is further equipped with an electrode unit for heating the furnace ash and molten iron K to prevent the temperature of the molten iron from decreasing, and a gas blowing unit for stirring the molten iron M to promote the migration reaction, it can achieve high efficiency and high productivity. A high concentration of zinc was recovered. The & standard applies to the Chinese National Standard (CNS) Α4 specification (210 × 297 mm). Order --- d

Claims (1)

517093 f .........--- --91 · 3 · 2 5 Announcement No · g8 “\ 年》 / ιΛ # Position · Amendment VI. Application for Special Scope 1. A method for recovering zinc oxide , Which includes the following steps: (a) mixing furnace ash containing iron oxides and zinc oxide with carbonaceous substances for reduction and hydraulic additives to produce a mixture; (b) coagulating the mixture to form aggregates ·, (C) Add the condensate to the molten iron in the melting furnace, so that the iron oxide and zinc oxide are reduced in the molten iron, so that the reduced iron enters the molten iron, and the reduced zinc evaporates and becomes oxidized Zinc, and from this the melting furnace produces a flue ash containing the zinc oxide; (d) heating the molten iron in the melting furnace by arc heating using an electrode unit; (e) from a blowing device provided at the bottom of the melting furnace Blow the stirring gas into the molten iron at a rate in the range from 0.1 to 2 Nm3 / hour per ton of molten iron; and (f) use at least two dust collectors to collect zinc argon above the specified concentration, the daily low The zinc oxide at the specified concentration is recycled to the agglomeration step (a) 2.-A kind of equipment for recovering zinc oxide , Which includes: agglomeration components, used to agglomerate the ash containing iron oxides and zinc oxide to form agglomerates; printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs (please read the precautions on the back before filling this page) Furnace for accommodating molten iron and adding condensate to the molten iron; a heating member for heating the molten iron contained in the reaction furnace, the heating member comprising an electrode unit for arc heating; a blowing device for The stirring gas is blown into the molten iron contained in the reaction furnace, and the blowing device is arranged at the bottom of the melting furnace; a recovery component for recovering zinc oxide generated in the reaction furnace, the recovery component includes The smoke ash of the flue gas furnace is collected in order from the paper size of China Chemical Industry Co., Ltd. applicable to the Chinese National Standard (CNS) A4 (210 X 297 mm) 517093 A8 B8 C8 D8 6. The zinc oxide-containing furnace ash generated from the scope of patent application At least two dust collectors; and a circulation component for circulating zinc oxide below a specified concentration to the condensation unit 3 · The device according to item 2 of the patent application, wherein The at least two dust collectors include: a first dust collector for collecting a flue furnace ash having a particle size of 10 μΐηΗ in the flue furnace ash generated by the melting furnace; and a second dust collector It is connected to the first dust collector to collect the flue furnace ash with a particle size of 0.1 μηη or more. The flue furnace ash with a particle size of 10 μm or more is recycled to the condensing component. Please read the precautions on the back before filling this page. Economy Printed by the Consumers' Cooperative of the Ministry of Intellectual Property Bureau of the People's Republic of China. The paper size applies to the Chinese National Standard (CNS) A4 (210 x 297 mm).