TW550292B - Method for conditioning steel-slag with steam in enclosed environment - Google Patents

Abstract

A method for conditioning steel-slag with steam in an enclosed environment comprises directly mounting steel-slag blocks in a simmering device; and cracking the steel-slag by water spraying, assisted by simmering thermal insulation and steam replenishment to maintain the steel-slag at 100 to 200 DEG C, such that a sufficient stable temperature of the steel-slag enables free calcium oxide in the steel-slag to promptly hydrolyze into calcium hydroxide and eventually achieve the objective of stabilization and pulverization.

Description

5 10 15 20 V. Description of the invention [Field of the invention] The present invention relates to a method for processing copper, lf, and slag, especially a kind of hot slag steam that uses a strip of * 1 for health and supplemented with slag. Health treatment methods. Female [Description of Knowing Skills] 'Continuous operation of the steel waste furnace 4 system, a Chen steel process, before the blast furnace ironmaking process, coal, limestone Sheng MA ^ x Shi Xun as a tincture aid, iron After the ore is heated and melted into molten iron, it will be sent to the trash and discharged into the core steel, and the impurities in the iron ore will be treated by indium sintering γ as "returning stone." Then, it will enter the converter and make steel for private use. Baixian put the scrap steel in the bottom of the converter, and introduced the molten iron after blast furnace smelting from the furnace mouth. In order to go to ... to meet the steel composition requirements, an appropriate amount of raw limestone and evil ^ fluorite will be added. , Ferromanganese, ilmenite, etc. are melted together: After the carbon or other impurities are removed by using human-oxygen lice equipment, the converter will pour the molten steel into a steel drum for subsequent The impurities discharged in the sequence are converter steel slag (that is, converter stone). Because the amount of steel slag produced in the converter steelmaking process is quite large, it was previously disposed of in a wasteful manner, such as the South Star Reclamation Plan. Treatment of stains 忒 Y + θ everywhere, but follow Nanxing project plan Upon completion, the treatment of steel is even more important, otherwise problems such as environmental protection struggles and increased costs of reprocessing will occur in the future. If combined with the announcement and reuse of steel slag generated by electric arc furnaces, it will cause a considerable environmental load. _Recent years In the past, it was found that steel slag has excellent physical and chemical properties similar to natural sand and gravel, abrasion resistance, same temperature and corrosion resistance. If it can be properly treated, it will have great potential for resource recycling. This paper M specification (21〇χ 297 mm) Page 4 550292 A7 B7 V. Description of the invention C 2) Taking converter stone as an example, the main components of converter stone are calcium hydroxide (Ca (0H) 2), silicon dioxide (Si〇2), Free calcium oxide (F-Ca0) and iron, etc., form solid large blocks after cooling, but have unstable characteristics such as natural expansion and natural decomposition. Therefore, if not treated properly, they will be reused (5) For example, as a foundation), there is a potential for serious crises such as foundation loosening due to expansion and blasting in the future. In view of this, at present, general resource recovery operators are trying to solve this problem.

Therefore, it is necessary to use the tank hot stuffing method or the steam health method to treat the steel slag as a resource. 10 The first investigation, the national application No. 081 1 09308 "Converter steel slag tank type heat-blocking treatment method and device" mentioned in the invention application is to first convert the converter steel slag generated by the converter to a high temperature of about 1,000 ° C in a pile After the slag yard is cooled to about 500 ° C ~ 700 ° C, the converter steel slag is then classified by the suction suction crane, and the steel with the larger steel content (that is, the larger volume) is held at the steel yard. Steel making, while those with lower steel content (ie, smaller volume) are concentrated. Then, the slag pusher is used to carry the classified and smaller volume converter steel slag into a hot slag slag tank in a room before being crushed and then sealed. When the converter steel slag uses water spray, the water and steel slag will quickly Produce heat exchange effect

20 A large amount of high-temperature steam is generated, and the steel slag itself is rapidly cooled and generates thermal stress due to hot stuffing, which results in fragmentation and pulverization; at the same time, a large amount of free calcium oxide in the converter steel slag is hydrolyzed into stable calcium hydroxide (Ca (〇H) 2) The converter steel slag is swelled and crushed. Therefore, the converter steel slag can achieve the purposes of heat preservation, granulation and stabilization. ≪ Although the aforementioned conventional pot-type hot stuffing method can stabilize the steel slag, this paper is a national standard f (21Gx 297 mm) suitable for financial countries Page 5 550292 A7

550292

V. Excessive heat and pressure in the description of the invention 'Except when the pressure in the tank is increased easily and the gas cannot be properly discharged', it may cause an explosion accident, even if the [force can be eliminated in time 'but accumulated in Whether the large amount of steel slag in the hot slag tank can be fully stabilized by the hot slag curing of the waste heat of the steel slag, 5 it has its difficulties', so the amount of steel slag that can be processed each time is limited to maintain the steel slag. The amount of secondary energy is true and stable. Continuing with the aforementioned lack of stable quality, since the steel slag has been sprayed with water when it is discharged, the steel rupture in the hot swelter will be broken and treated again. In view of the surface and heart of the block-like steel slag,部 的 温 10 度 有 大大 差 #, so when the steel is undergoing the hot stuffing process +, due to the different and uneven distribution of the temperature of the steel slag, plus the hot stuffing process, the temperature will gradually / shaw and other factors, making The hot slag process of steel slag cannot be maintained at a fixed temperature and pressure for health, which makes it difficult to control the stabilization time, thereby making the quality of the steel slag stable and uneven, and it is difficult to show the effectiveness of its stable quality. 3 · The processing is complicated and the equipment is easy to be damaged. Due to various factors, the size of the hot slag tank is limited. Therefore, the steel slag input must be pre-treated to increase the amount of steel slag. It is complicated, that is, when the steel slag is put into the hot slag slag tank, because 20 steel slag contains steel or iron and other substances, in order to prevent these substances from occupying the space in the hot slag slag tank, in order to increase the amount of steel slag treatment each time, the pre-treatment The steel or iron in the steel slag must be screened before being placed in a hot slag tank, so the pre-treatment is more troublesome. In addition, the screening of steel slag is performed at high temperature, so the screening equipment is extremely easy. Cause damage.

Page 7 550292 A7 ---------- B7 V. Description of the invention (5) ~ '4 · Equipment is expensive: It is known that the tank-type hot stuffing method accumulates the heat and pressure generated by the steel slag itself, ", Stuffy / check the tank 'through long-term health to achieve the steel slag granulation, stabilization and other effects, so the thermal insulation effect of the hot stuffing material directly affects the steel / check the stability of the alpha mouth quality' so hot stuffing The equipment cost of the residue tank is relatively high. Another way to know the radon gas health method is to first cool the converter steel slag generated by the converter at a high temperature of about 1000 ° C in a slag yard to normal temperature, and then use the crane to hold the converter steel. For classification, those with more steel content (that is, the larger 10 volume) are held to the steel yard for steelmaking, while those with lower steel content (that is, the smaller volume) are concentrated. Then, use a screening machine to sort the steel ruptures. For small steel ruptures, use a pusher to place them in the furnace. Otherwise, the larger particles must be crushed and screened to the required size. After the steel is placed in the holding tank, it is sealed and then a large amount of steam is used for a period of time; 15 is added so that a large amount of free calcium oxide in the steel slag is hydrolyzed into stable calcium hydroxide (Ca (OH) 2) , And then achieve the stabilization effect of the steel slag, and finally take out the cooled steel rupture. Although the above-mentioned conventional steam health method can stabilize the steel slag and solve the problems of the conventional tank-type hot stuffing method, which is expensive and easy to damage and the quality is unstable20, the actual use still has the following shortcomings. The description is as follows: 1. The air pollution problem is caused. As the conventional steam health method is still the same as the conventional tank hot stuffing method, that is, the high temperature steel slag is dumped on the ground after being discharged as a liquid. Contains heavy materials such as steel or iron, so cool it for a while

Page 550292 5. After the description of the invention, ° He steel or iron will gradually precipitate on the bottom of the steel slag, which will easily cause the surface stickiness, σ phenomenon. Therefore, the operator will spray water to crack into pieces and the ground for easy Subsequent transportation; however, when the aforementioned steel slag is sprayed with water to cool down and cleared after being cracked into 5 pieces, it is easy to generate dust and cause air pollution. Pre-treatment is complicated: 0 After the steam steaming method is put into the furnace tank, there is no water spray cracking operation. Secondly, it is completed by using steam replenishment method. Therefore, it is necessary to deal with the steel slings, except for screening steel Iron or steel, in order to increase the amount of steel slag input. At the same time, the steel slag must have a size limitation. Therefore, the larger φ Pingxuan particles of the steel slag must be repeatedly crushed and screened. Therefore, the pre-operation is more complicated. . 3 · Consumption of steam is large: As a result of the conventional steam health, the king ’s bed and the king use the supplementary effect of steam,

5 Steel reeds at room temperature should be treated with Luli m lL / should be processed, so it must consume a lot of steam in order to maintain the furnace tank to the right ^ ^ to find the degree and pressure, the relative cost is relatively high. [Summary of the invention] The purpose of the invention is to provide a hot slag steam curing treatment method for steel slag that has low energy consumption and has the effect of slagging and incubation. In the present invention, the method for treating hot-steaming steam on the edge of steel of the present invention is used to stabilize steel slag, which is based on a white female .. ^ There is a steel slag separate step, a steel slag feeding step, a water inlet step, and a treatment. Milk (, should be steps, a hot and stable paper ruler when Guanjia 297), a page 9 550292 A7 '^^ --—__ B7 V. Description of the invention ^ —-—--Steps to Fen » Jie Jiang ^ a slag removal step. The pre-step of the steel slag is to make the liquid steel material below ^ 800 c and make the steel slag into a block. The second step of slag entering the slag is to put the block steel bar that has been processed in the above steps into a hot 5 liters and crush it into lumps. The slag device has a slot that should be provided with: The steam supply provided in the tank body is covered on the top edge of the tank body, and the hot and sullen space forms a closed + L = top ridge, and a water spray member is provided on the top cover. The water inlet uses the σ-sea water spray to continuously spray the above-mentioned block-shaped steel slag ^, so that the steel slag cracks again into small blocks, and at the same time, the steel slag and water generate a heat exchange effect, so that the hot and humid space is filled with high heat. Energy steam to continuously stabilize the steel slag. In the steam supply step, when the heat of the stuffy space is gradually declining, the steam supply pipe is used to supply steam and enter the heat stuffing device to maintain a certain amount of heat energy in the stuffy space. 2 The steel is granulated and powdered. Into. The heat-stabilization stabilization step is to maintain a certain amount of thermal energy in the heat-stamp two rooms, and by using the heat-suppression, the free calcium oxide in the steel slag is quickly hydrolyzed into stable calcium hydroxide, and to: And shredding effect. The slag extraction step is that after the steel slag has been stabilized and pulverized, it is allowed to naturally cool below 90 ° C, and then the processed steel slag can be taken out of the hot-steaming device. [Detailed description of the invention] Other features and advantages of the present invention will be clearly understood in the following detailed description of the preferred embodiments with reference to the drawings. Refer to the first figure, which is a preferred embodiment of the method for curing hot slag steam of the present invention, for stabilizing and pulverizing the steel slag. This paper size applies to China National Standard (CNS) A4 (210x 297 mm) Page 10 550292

‘Steel slag feeding step 2, water inlet step 3, steam supply step 4, a hot stuff stabilization step 5, and a slag discharge step 6. In the steel slag pre-step i, the worker first fills the liquid steel slag (taking the converter steel slag produced by the converter steelmaking process as an example) in a tray and air-cools it to below 800 ° C, so that the steel slag is formed into a specific size. Moreover, the surface temperature of the red slag in the form of a block is about 20 (rc ~ 300x :, and the center temperature is about 500 ° C to 700 ° C, and the steel slag is in a block shape to facilitate transportation. Ίο 该 钢 逢㉟ ^ The gas health department at Wangli ^ includes a pre-check step in the steel slag feeding step 2, which uses a dump truck (not shown in the figure) to carry the massive steel slag and dump it directly to a In the heat-suppressing device 2 丨 please refer to the second figure in succession. The aforesaid heat-suppressing device 21 has a slot body 211 formed with a slotted space 212, a radon supply pipe 213 disposed in the slot body 211, a Covered on the top edge of the groove body 211, a cover 214 that can block the hot space 2U, and a water spray member 216 provided on the cover 214, and may further include a hot space 212 A thermometer 215 for sensing the temperature in the hot stuffy space 212, and a thermometer 215 provided in the hot stuffy space 212 And a pressure gauge 217 for sensing the pressure in the hot space 212, and a pressure relief valve 218 (non-creative feature, only shown schematically in the figure) provided on the top cover 214. The set temperature of the thermostat 215 is between 10 ° and 200 ° :, and it can drive the steam supply action of the therapy gas supply pipe 213. In this embodiment, the set temperature of 15.0 ° is used as an example for illustration. In addition, the set pressure of the manometer 217 is described in this implementation queue with 0 02 ~ 005Kg / m, and the manometer 217 can control the water inlet action of the water spraying member 216. 20 550292 V. Invention Explanation (2 of block 2: described in 9 ::::: using the water spray member 216 to continue to the upper place ... high temperature steam Yang ::::: space "industry It can be effectively changed into small pieces: the same question. In addition, it will also cause the cracking of the stuffy space to be filled with high temperature and generate heat exchange effect. And the right Γ thermal stress, the steel slag 7 will break again, which is beneficial to the subsequent stabilization rate. 10 Pressure :: '' ::: Force: 217 means that when the _, 212 is measured, except that the excess pressure is + + by the pressure valve 218 to ensure safe operation, and the pressure gauge 217 can be closed "The water-feeding action of the water-spraying member 216 prevents the pressure from rising in the hot stuffy space 212. Conversely, when the force is lower than the set force, the water-spraying member 216 15 will perform water-spraying operation again to improve the heat. The pressure in the stuffy space 212 is repeated until the heat energy generated by the steel collapse 7 cannot be raised by the water spray. 20 In the steam supply step 4, when the heat in the stuffy space 2 丨 2 gradually disappears , So that the temperature in the hot and humid space is lower than 150 set by the thermometer 21 5. (: At that time, the temperature measuring device 215 will act as a steam supply pipe to maintain the hot stuffy space 212 with a certain amount of thermal energy, so that the temperature of the steel slag can be maintained at a set of 1 50X: or more, to provide enough steel slag 7 Stabilize and granulate the temperature, and repeat the steam replenishment operation of the thermometer 2 丨 5 for a set period of time. In the heat-stabilizing and stabilizing step 5, the hot-stamping space 2 12 uses the above paper size. Applicable to China National Standard (CNS) A4 specification (210x 297 mm) Page 12 550292 A7

The intermittent supply of steam by the steam supply pipe 213, combined with the hot stuffing effect and good thermal insulation effect, allows the hot stuffing space 212 to maintain a set temperature and pressure, and the free calcium oxide contained in the steel slag can be rapidly hydrolyzed. ^ Form stable osmium calcium oxide, which makes the content of free calcium oxide lower than outside, and 5 has an excellent stabilizing effect; further, the internal pressure of steel slag increases with the hot stuffing effect, plus the free oxidation in steel slag 7 The natural expansion characteristics of calcium in the process of hydrolysis to calcium hydroxide promote the volume expansion of the steel slag 7 to be crushed and pulverized again to achieve the purpose of pulverization, and effectively complete the high stability and high pulverization quality. Recycled steel slag. 10 In the slag extraction step 6, when the steel slag 7 has been stabilized and pulverized, it is naturally cooled to below 90 ° C, and then the processed steel slag 7 can be taken out of the hot-pressing device 21. According to the foregoing description, the following effects can be formulated, and details are as follows: 1 · No air pollution problem: 15 After the high temperature steel slag 7 is discharged as a liquid, it can be contained in a tray and allowed to cool for a period of time After that, the cooled and hardened steel slag is directly loaded into the hot-pressing device 21, and the water-spraying operation of the steel slag 7 is performed in a closed hot-pressing device 21, so there is no air pollution caused by water spray caused by flying dust. 202. Pre-treatment is relatively simple: Although steel slag 7 contains iron or steel and other materials, these materials do not need any screening or crushing operations, as long as the steel slag block cooled to 800 ° C is transported to hot stuff The device 21 can be inserted, so the pre-operation is relatively simple. This paper size applies the Chinese National Standard (CNS) A4 specification (210χ 297 public love) Page 13 550292 A7 B7 V. Description of the invention c li) ~~~ 3 · Low steam consumption: Because the heat energy generated by the steel slag 7 spraying water is used in this case , And supplemented with steam supplement at appropriate time to maintain a certain temperature and pressure, so the required consumption is relatively reduced, and the cost is also reduced. 5 4 · Stable quality and fast production speed: As this case, the steel slag 7 cooled to a block is transported to the heat-suppressing device 21, and the method of spraying water on the steel slag 7 is adopted to make the heat and pressure generated by the steel 7 slag itself. Stored in the hot stuffing device 21, and then supplemented with steam, so that the hot stuffing space 212 can be maintained at a set temperature and 10 pressure for a long time, so that the time required for granulating and stabilizing the steel slag 7 is reduced. And the quality effect is stable. °° 5 · Equipment is not easy to be damaged: Because the steel slag 7 in this case does not require pre-processing operations such as screening and crushing, there is no known screening or crushing equipment that is easily damaged. 15 6 · Equipment is cheaper than conventional: In the hot process of this case, even if the heat disappears, it can be supplemented with radon to maintain the temperature and pressure of the hot space 2 丨 2, so the thermal insulation effect of the equipment, There is no need to know the precision of the pot-type hot stuffing method. On the contrary, the equipment cost is cheaper than the conventional one. 20 In summary, according to the steel slag hot-steaming steam curing treatment method of the present invention, a block-shaped steel slag is put into the hot-steaming device 2 with low equipment cost, and the thermotherapy gas can be intermittently supplied. Effectively reduce the consumption of steam, and can effectively improve the stabilization rate and pulverization effect of steel slag. However, the above are only the preferred embodiments of the present invention. When this paper size applies the Chinese National Standard (CNS) A4 specification (21〇χ 297 mm) ---- page 14 550292 A7 B7 5 2. Description of the invention (12) The scope of implementation of the present invention cannot be limited in this way, that is, any simple equivalent changes and modifications made according to the scope of the patent application of the present invention and the contents of the description of the invention should still fall within the scope of the patent of the present invention. This paper size applies the Chinese National Standard (CNS) A4 specification (210x 297 mm) Page 15 550292 A7 B7 V. Description of the invention (13) [Simplified description of the formula] The first figure is a flowchart illustrating the steel slag of the present invention One of the preferred embodiments of the hot-steam steam health treatment method; and the second figure is a schematic diagram of a device illustrating a hot-steam device used in the preferred embodiment. [Comparison of component numbers] 1 Steel slag pre-step 2 1 6 Water spraying 2 Steel slag approaching step 2 1 7 Pressure measuring device 21 Hot stuffing device 2 1 8 Pressure relief valve 211 Tank body 3 Water inlet step 2 1 2 Hot stuffing space 4 Steam supply step 2 1 3 Steam supply tube 5 Hot stuff stabilization step 2 1 4 Top cover 6 Slag removal step 2 1 5 Thermometer 7 Steel slag This paper size applies to Chinese National Standard (CNS) A4 (210x 297 mm) ) Page 16

Claims (1)

550292 A8 B8 C8 D8 6. Scope of patent application A steel slag hot steam curing treatment method includes in order to stabilize the steel collapse. The pre-step 'is to first make the liquid surface to 800. 〇 'and make the steel slag into a block; a steel crushing feeding step, the block steel slag completed by the above-mentioned Gong, Fanli λ township is carried into a hot stuffing device, and the hot stuffing device has a A trough body with a hot space is formed, a picture of “哕 ❹”, a steam supply tube in the body,-sighed on the top edge of the trough body and made the mandarin ducks, ^ ... ask & between The top plate in a closed state, and a water-spraying member provided on the top cover; a water-intake step, using the water-spraying member, Mu: — + & noon holding, the man on the above-mentioned block steel. U, L ^ Into small pieces, at the same time, the steel slag and water produce heat exchange effect, so that the stagnation is filled with high thermal energy steam in ^, ..., to stabilize the steel rupture anti-deer Supplying step 'When the heat of the hot stuffy space has gradually disappeared, supply steam through the steam supply pipe to enter the thermal device and hold the hot stuffy space with a certain amount of thermal energy' to granulate the steel slag;-Hot stuffing stabilization step ' By maintaining a certain set of thermal energy in the thermal space And by the heat of the heat, the free oxygen calcium in the steel slag is quickly hydrolyzed into stable calcium hydroxide, and the sheep is transported to the stabilization and crushing effect; and a slag discharge step, when the steel slag has been stabilized and After being pulverized, it is allowed to naturally cool to below 90 ° C, and then the treated surface, wood can be taken out of the device. The steel produced from this hot question 2 According to the first scope of the patent application, the steel slag can be steam-steamed. < Handling of this paper is in accordance with Chinese National Standard (CNS) A4 (210x 297 mm) Page 17 550292 6. Scope of patent application B8 C8 D8 Method 'wherein' the liquid steel slag can be contained in a 4 tray to make the steel slag into a specific size and facilitate transportation. According to the steel scope in the scope of the patent application, item # 1, the hot-steaming steam curing treatment method is also provided. The hot-steaming device further has a hot-steaming space located in the hot and cold space. Thermometer 'The set temperature of the thermometer is between M10 (rc ~ 2〇 (rc). At the same time, the thermometer can drive the steam supply action of the steam supply pipe. Therefore, when the temperature of the hot space is lower than the setting of the thermometer When the temperature is reached, it can be controlled to enter the hot stuffing space. 4 According to the steel slag hot stuffing according to item 1 of the scope of the patent application, the method of Jf's health maintenance Jf method 'wherein the hot stuffing device has a setting A manometer on the hot room ~ I, and the manometer can control the water inlet action of the water spraying plant in the workshop. This paper size applies to China National Standard (CNS) A4 (210X 297 mm) Page 18