Steel slag and mineral slag micro-powder preparation system

Abstract

The utility model discloses a steel slag and mineral slag micro-powder preparation system. The system comprises a roller press, a first powder concentrator, a second powder concentrator, a third powder concentrator, a ball mill and a fourth powder concentrator which are connected in sequence, wherein a coarse material outlet of the third powder concentrator is respectively connected with a feeding hole of the roller press and a feeding hole of the ball mill through an electric distributing valve, and a fine material outlet of the third powder concentrator is connected to a finished product bin through a finished product conveying system; an air outlet of the second powder concentrator is connected with a first powder collector, an air outlet of the fourth powder concentrator is connected with a second powder collector, and a discharge port of the first powder collector and a discharge port of the second powder collector are connected to a finished product bin through a finished product conveying system. The roller press and the ball mill are combined, the coarse material outlet of the third powder concentrator is respectively connected with the roller press and the ball mill through the electric material distributing valve, and the device can be flexibly adjusted in use so as to meet production requirements.

Description

TECHNICAL FIELD

[0001] The utility model relates to steel slag and mineral slag micro powder preparation technical field, especially a kind of steel slag, mineral slag micro powder preparation system. BACKGROUND

[0002] Steel slag and mineral slag are a kind of new green building material, which are concerned by steel industry, cement industry and construction industry. Mineral slag micro powder contains glass body, wollastonite, dicalcium silicate and other substances, which are main raw materials of cement composition. Steel slag micro powder contains tricalcium silicate, dicalcium silicate, calcium aluminate, RO and free CaO, and has super high activity, which can be used as mixed material of cement or active admixture of concrete. In recent years, with the development of national economy and the increasing trend of enterprise solid waste materialization utilization, more and more steel slag and mineral slag micro powder preparation processes are developed at home and abroad.

[0003] At present, steel slag and mineral slag micro powder preparation processes mainly include vertical mill production process, roller press final grinding process and ball mill open flow or circle flow production process. With the continuous research on steel slag and mineral slag micro powder technology, the advantages and disadvantages of the above grinding systems are also reflected. Vertical mill production process and roller press final grinding process are known for high efficiency and low energy consumption. However, these two production processes are difficult to produce micro powder with specific surface area > 450 m 2 / kg, and the power consumption will increase significantly. Ball mill open flow or circle flow production process has the problems of high power consumption and high operation cost. INVENTION CONTENTS

[0004] Therefore, according to one embodiment of the utility model, the purpose is to provide a new type of steel slag and mineral slag micro powder preparation system. The system combines the characteristics of high efficiency and energy saving of roller press with the characteristics of wide particle distribution and good particle morphology of ball mill micro powder. The third powder separator coarse material outlet is connected with roller press and ball mill through electric material distribution valve. During use, the material flow direction is adjusted through electric material distribution valve, so that the system operation mode can be flexibly adjusted, and the production demand of steel slag and mineral slag micro powder can be met.

[0005] The above purpose can be realized by the following technical solutions:

[0006] According to one aspect of the utility model, the utility model provides a kind of steel slag, mill powder preparation system, including roller press, first powder concentrator, second powder concentrator, third powder concentrator, ball mill and fourth powder concentrator;Wherein, the roller press is used to crush and grind into micro powder to the incoming material from feed inlet, the roller press discharge port is connected with the first powder concentrator feed inlet, and the first powder concentrator discharge port is connected with the roller press feed inlet;First powder concentrator hot air inlet is connected with the high-temperature flue gas air outlet of hot blast furnace, and the first powder concentrator air outlet is connected with the second powder concentrator air inlet, and the second powder concentrator discharge port is connected with the third powder concentrator feed inlet, and the third powder concentrator fine material outlet is connected to finished product bin by finished product conveying system, and the third powder concentrator coarse material outlet is connected with the roller press feed inlet and ball mill feed inlet by electric material distributing valve respectively, and the ball mill discharge port is connected with the fourth powder concentrator feed inlet.

[0007] Optionally, the second powder concentrator air outlet is connected with the first powder collector air inlet, and the first powder collector discharge port is connected to finished product bin by finished product conveying system, and the first powder collector air outlet is connected with first discharge device;Fourth powder concentrator air outlet is connected with the second powder collector import, and the second powder collector discharge port is connected to finished product bin by finished product conveying system;Second powder collector outlet is connected with second discharge device.

[0008] Optionally, the first powder concentrator is V-type powder concentrator;Second powder concentrator is cyclone separator;The third powder concentrator is combined powder concentrator;Fourth powder concentrator is dynamic powder concentrator.

[0009] Optionally, the first powder collector is static selection powder collector;Second powder collector is dynamic selection powder collector.

[0010] Optionally, the static selection powder collector and dynamic selection powder collector are both air tank pulse bag type powder collector.

[0011] Optionally, the high-temperature flue of the hot blast furnace is also connected with the outlet of the first discharge device.

[0012] Optionally, the hot blast furnace is vertical cyclone gas hot blast furnace.

[0013] Optionally, the high-temperature flue of the hot blast furnace is also provided with cold air supplement valve.

[0014] Optionally, the hot blast furnace is vertical cyclone gas hot blast furnace.

[0015] Optionally, it further includes: quantitative feeder, weighing bin connected with quantitative feeder, and lifting machine for lifting material in weighing bin to roller press feed inlet.

[0016] Optionally, the first powder selecting machine outlet is connected to the weighing bin, and the weighing bin is connected to the roller press inlet to mix the first powder selecting machine outlet with the raw material and then send the mixture to the roller press inlet through the elevator.

[0017] Optionally, the fourth powder selecting machine outlet is connected to the ball mill inlet to send the sorted semi-finished product to the ball mill for grinding.

[0018] Optionally, the first exhaust device comprises a static air selecting fan and a first exhaust cylinder, the first powder collector air outlet is connected to the static air selecting fan air inlet, and the static air selecting fan air outlet is connected to the first exhaust cylinder.

[0019] Optionally, the second exhaust device comprises a dynamic air selecting fan and a second exhaust cylinder, the second powder collector outlet is connected to the dynamic air selecting fan air inlet, and the dynamic air selecting fan air outlet is connected to the second exhaust cylinder.

[0020] Beneficial effects: according to one embodiment of the utility model, the steel slag and the mineral slag micro powder preparation system is a new type of micro powder preparation system formed by combining the roller press and the grinding, has the characteristics of high efficiency and energy saving of the roller press and the characteristics of wide particle distribution and good particle shape of the ball mill. The new type of micro powder preparation system connects the third powder selecting machine coarse material outlet to the roller press and the ball mill through the electric material distributing valve, so that the micro powder preparation system can be flexibly adjusted according to the production requirements when the micro powder preparation system is used for micro powder preparation.

[0021] Compared with the prior art, the embodiment of the utility model has the following beneficial effects:

[0022] 1) the third powder selecting machine coarse material outlet is connected to the roller press inlet and the ball mill inlet through the electric material distributing valve, the system can be flexibly adjusted according to the requirement of the specific surface area of the finished product when the steel slag and the mineral slag micro powder are prepared by using the system.

[0023] Specifically, the flow direction of the coarse material is adjusted by adjusting the electric material distributing valve, so that the roller press semi-finished grinding operation mode and the roller press + ball mill combined operation mode can be flexibly adjusted. For example, the coarse material flows to the roller press by adjusting the electric material distributing valve, so that the roller press grinding mode can be independently operated. In this operation mode, the system structure is compact, the land occupation area is small, the produced steel slag and mineral slag meet the particle shape rules, the maintenance workload of the high-pressure roller press is small, the investment is low, and the system power consumption is low. For another example, the coarse material flows to the roller press and the ball mill by adjusting the electric material distributing valve, so that the roller press cooperates with the ball mill to produce, not only has the above-mentioned roller press grinding characteristics, but also can produce superfine powder. In addition, the system can also realize independent grinding of the steel slag without using drying energy, thereby reducing the drying fuel cost.

[0024] 2) The utility model discloses after second powder classifier and fourth powder classifier respectively increase the powder collector, can realize step by step powder collection, improve the powder selection rate, ensure that the powder concentration (<10mg / Nm 3 ) of powder collector export, satisfy the enterprise waste gas emission standard.

[0025] 3) The utility model discloses hot blast furnace adopts vertical cyclone gas hot blast furnace, still connects the high temperature flue of hot blast furnace with first emission device, and the hot flue gas of hot blast furnace export mixes after the exhaust gas of first powder collector after discharging, enters first powder classifier, has reduced the emission of nitrogen oxides, has satisfied atmospheric pollutant emission standard. Through setting up the cold air valve of supplementing on the high temperature flue of hot blast furnace, prevent the temperature of the flue gas entering first powder classifier from being too high, cause first powder collector to paste bag. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is the structure schematic diagram of steel slag, slag micro powder preparation system in the utility model one embodiment.

[0027] The drawing figure sign 1-roller presser;2-V type powder classifier;3-cyclone separator;4-static selection powder collector;5-static selection fan;6-static selection rear exhaust cylinder;7-hot blast furnace;8-combination type powder classifier;9-ball mill;10-dynamic powder classifier;11-dynamic selection powder collector;12-dynamic selection fan;13-dynamic selection rear exhaust cylinder;14-electric material distributing valve. DETAILED DESCRIPTION

[0028] The technical scheme of the utility model will be described clearly and completely in combination with the embodiments of the utility model. Obviously, the described embodiments are only a part of the embodiments of the utility model, not all the embodiments. The description of the at least one exemplary embodiment is only illustrative, not as any limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0029] Figure 1 The structure of steel slag, slag micro powder preparation system in the utility model one embodiment is shown. The steel slag, slag micro powder preparation system of this embodiment includes roller presser 1, first powder classifier, second powder classifier, third powder classifier, ball mill 9 and fourth powder classifier. The system combines the characteristics of high efficiency and energy saving of roller presser 1 and the characteristics of wide particle distribution and good particle morphology of ball mill 9 in producing micro powder. When the system is used to prepare steel slag, slag micro powder, the system operation mode and process can be flexibly adjusted.

[0030] In this embodiment, the first air classifier is a V-type air classifier 2, the second air classifier is a cyclone separator 3, the third air classifier is a combined air classifier 8, and the fourth air classifier is a dynamic air classifier 10. The roller press 1 is a high-pressure roller press.

[0031] like Figure 1 As shown, the discharge port of the roller press 1 is connected to the inlet of the V-type classifier 2, used to crush and grind the incoming material into fine powder. The discharge port of the V-type classifier 2 is connected to the inlet of the roller press 1. The V-type classifier 2 mixes the sorted coarse powder with fresh material and then conveys it back to the roller press 1 system for extrusion and grinding via a feeding elevator. The high-temperature flue gas outlet of the hot air furnace 7 is connected to the hot air inlet of the first classifier. The material entering the V-type classifier 2 is dried and air-classified by the hot air from the hot air furnace 7. The outlet of the V-type classifier 2 is connected to the inlet of the cyclone separator 3. The fine powder sorted by the V-type classifier 2 enters the cyclone separator 3 for coarse selection. The discharge port of cyclone separator 3 is connected to the inlet of combined classifier 8. The fine material outlet of combined classifier 8 is connected to the finished product silo through the finished product conveying system. The coarse material outlet of combined classifier 8 is connected to the inlet of roller press 1 and the inlet of ball mill 9 through electric distribution valve 14. The discharge port of ball mill 9 is connected to the inlet of dynamic classifier 10.

[0032] In this invention, the coarse material outlet of the combined air classifier 8 is connected to the roller press 1 and the ball mill 9 via an electric distribution valve 14. The electric distribution valve 14 allows for flexible adjustment of the system's operating mode, thereby enabling flexible process adjustments to meet various production needs. Specifically, if slag needs to be ground separately or a low specific surface area is required, the electric distribution valve 14 can be adjusted to direct the coarse material from the combined air classifier 8 only to the roller press 1, thus creating a semi-final grinding operation mode using only the roller press. Grinding in this mode reduces power consumption. If steel slag needs to be ground separately or a high specific surface area is required, the electric distribution valve 14 can be adjusted to direct the coarse material from the combined air classifier 8 into both the roller press 1 and the ball mill 9, employing a combined roller press + ball mill operation mode. Grinding in this mode further increases the specific surface area of ​​the material, meeting the requirements for preparing high specific surface area steel slag / materials. As can be seen, the electric material distribution valve 14 of this utility model enables the system to flexibly adjust to "semi-final grinding operation mode of roller press" and "co-current operation mode of roller press + ball mill" according to the user's material requirements.

[0033] In addition, the system can further include a dosing feeder, a weighing bin, and an elevator, etc. The raw material plant slag and slag raw materials are respectively weighed and conveyed to the weighing bin by the dosing feeder in a certain proportion. The weighing bin is connected with the dosing feeder. The elevator, such as a feeding elevator, is used to send the materials in the weighing bin into the roller press 1 through the feeding port of the roller press 1 for extrusion and grinding. In use, the materials after extrusion by the roller press 1 can be lifted to the V-type powder concentrator 2 by the circulating elevator, and the materials entering the V-type powder concentrator 2 are dried and air-separated by the hot air from the hot blast furnace 7. The coarse powder after air separation is mixed with fresh materials, conveyed by the feeding elevator, and then returned to the roller press 1 for extrusion and grinding.

[0034] The ball mill 9 discharges into the dynamic powder concentrator 10, which adjusts the fineness of the finished product by frequency conversion and speed regulation. The finished product is collected by the dynamic powder collector and then enters the finished product conveying system and is sent to the finished product bin. For example, the finished product selected by the dynamic powder concentrator 10 is collected by the dynamic powder collector 11 and then enters the finished product conveying system, while the semi-finished product after selection by the dynamic powder concentrator 10 enters the ball mill 9 system for further grinding.

[0035] Further, a powder collector is arranged after the second powder concentrator and the fourth powder concentrator to increase the specific surface area of the finished product.

[0036] Specifically, the air outlet of the cyclone separator 3 is further connected with the air inlet of the first powder collector, the discharge port of the first powder collector is connected to the finished product bin through the finished product conveying system, and the air outlet of the first powder collector is connected with the first exhaust device. By adding the static powder collector 4 after the cyclone separator 3, the specific surface area of the finished product is increased, and the comprehensive power consumption is reduced.

[0037] The first powder collector is the static powder collector 4, and further, a gas tank pulse bag type powder collector is selected. The first exhaust device includes a static fan 5 and a first exhaust cylinder, which is a static post-exhaust cylinder 6. The air outlet of the first powder collector is connected with the air inlet of the static fan 5, and the air outlet of the static fan 5 is connected with the static post-exhaust cylinder 6.

[0038] In addition, the air outlet of the dynamic powder concentrator 10 is further connected with the inlet of the second powder collector, the discharge port of the second powder collector is connected to the finished product bin through the finished product conveying system, and the outlet of the second powder collector is connected with the second exhaust device. By adding the powder collector after the cyclone separator 3 and the dynamic powder concentrator 10, the powder collector collects the powder step by step, ensures that the powder concentration at the outlet of the powder collector is <10 mg / Nm 3 , improves the powder concentration rate, and meets the enterprise waste gas emission standard.

[0039] The second discharging device comprises a dynamic selection fan 12 and a second exhaust cylinder, and the second exhaust cylinder is a post-dynamic selection exhaust cylinder 13.

[0040] Further, the high-temperature flue of the hot blast furnace 7 is connected with the outlet of the first discharging device, in particular, the outlet of the static selection fan 5.

[0041] The steel slag and slag micro-powder preparation system provided by the utility model can realize flexible adjustment of system operation mode through the electric material distribution valve according to the requirements of users on the material.

[0042] The following describes the use process of the steel slag and slag micro-powder preparation system provided by the utility model by taking two operation modes as examples.

[0043] The raw material plant steel slag and slag raw materials are weighed and conveyed to the weighing bin by the quantitative feeder in a certain proportion, the material after extrusion by the high-pressure roller press 1 enters the circulating elevator and is lifted to the V-type powder concentrator 2.

[0044] The finished product from the V-type powder concentrator 2 outlet enters the cyclone separator 3 for coarse selection of micro-powder, the finished product after selection is collected by the static selection powder collector 4, i.e., the gas tank pulse bag dust collector, and then enters the finished product conveying system and is sent to the finished product bin.

[0045] The roller press semi-finish grinding operation mode is adopted: the coarse powder of the combined powder concentrator 8 enters the roller press 1 for grinding, at this time, the ball mill 9 and the components connected thereto are not started.

[0046] When the roller press + ball mill is combined to run: the combined powder concentrator 8 is used to grind the coarse powder into the roller press 1 and the ball mill 9, the ball mill 9 is used to grind the coarse powder into the dynamic powder concentrator 10, the dynamic powder concentrator 10 is used to adjust the fineness of the finished product by frequency conversion, the finished product is collected by the dynamic powder concentrator 11, and the collected product is conveyed into the finished product warehouse through the finished product conveying system, and the coarse powder separated by the dynamic powder concentrator 10 is returned to the ball mill 9 for grinding. In addition, the coarse powder separated by the dynamic powder concentrator 10 is further ground into the ball mill 9.

[0047] The slag and the steel slag in the V-shaped powder concentrator 2 are dried by the high-temperature hot flue gas provided by the hot blast furnace 7, and then the steel slag and the slag powder are conveyed to the cyclone separator 3 by the hot flue gas, the cyclone separator 3 is used for coarsely separating the slag powder in the hot flue gas, a static powder collector 4 is arranged after the cyclone separator 3, the specific surface area of the finished product of the static powder collector 4 can be greater than 500 m 2 / kg, the finished product of the static powder collector 4 is conveyed into the finished product warehouse at the end, and the specific surface area of the material in the finished product warehouse is increased.

[0048] In addition, when the preparation system is running, the high-temperature hot flue gas provided by the hot blast furnace 7 is mixed with the waste gas generated after the static selection fan 5 to enter the V-shaped powder concentrator 2, a cold air supplement valve is arranged on the high-temperature flue at the outlet of the hot blast furnace 7 to prevent the temperature of the flue gas entering the V-shaped powder concentrator 2 from being too high, and the static powder collector 4 is prevented from being pasted.

[0049] The description of the utility model is given for example and description, and is not exhaustive or limits the utility model to the disclosed form. Many modifications and changes are obvious to those skilled in the art. The embodiments are selected and described to better illustrate the principles and practical application of the utility model, and to enable those skilled in the art to understand the utility model so as to design various embodiments with various modifications suitable for specific purposes.

Claims

1. A steel slag, slag micro-powder preparation system, characterized in that, The roller press, the first powder concentrator, the second powder concentrator, the third powder concentrator, the ball mill and the fourth powder concentrator are included. The roller press is used for crushing and grinding the raw material into powder, and the roller press outlet is connected with the first powder concentrator inlet, and the first powder concentrator outlet is connected with the roller press inlet; the high-temperature flue gas outlet of the hot blast furnace is connected with the first powder concentrator hot air inlet, the first powder concentrator outlet is connected with the second powder concentrator inlet, the second powder concentrator outlet is connected with the third powder concentrator inlet, the third powder concentrator fine material outlet is connected with the finished product warehouse through the finished product conveying system, and the third powder concentrator coarse material outlet is connected with the roller press inlet and the ball mill inlet through the electric material distributing valve, and the ball mill outlet is connected with the fourth powder concentrator inlet. The first powder collector outlet is connected with the finished product conveying system and the finished product warehouse, and the first powder collector outlet is connected with the first exhaust device; the fourth powder concentrator outlet is connected with the second powder collector inlet, and the second powder collector outlet is connected with the finished product conveying system and the finished product warehouse; and the second powder collector outlet is connected with the second exhaust device.

2. The steel slag, slag powder preparation system according to claim 1, characterized by, The first powder concentrator is a V-shaped powder concentrator, the second powder concentrator is a cyclone separator, the third powder concentrator is a combined powder concentrator, and the fourth powder concentrator is a dynamic powder concentrator.

3. The steel slag, slag powder preparation system according to claim 2, characterized by, The first powder collector is a static powder collector, and the second powder collector is a dynamic powder collector.

4. The steel slag, slag powder preparation system according to claim 3, characterized by, The static powder collector and the dynamic powder collector are both air tank pulse bag powder collectors.

5. The steel slag, slag powder preparation system according to claim 2, characterized by, The high-temperature flue of the hot blast furnace is also connected with the outlet of the first exhaust device.

6. The steel slag, slag powder preparation system according to claim 5, characterized by, The hot blast furnace is a vertical cyclone gas hot blast furnace, and a cold air supplement valve is arranged on the high-temperature flue of the hot blast furnace.

7. The steel slag, slag powder preparation system according to claim 1, characterized by, Further comprising: A quantitative feeder, a weighing bin connected with the quantitative feeder, and a hoist used for lifting the material in the weighing bin to the roller press inlet.

8. The steel slag, slag powder preparation system according to claim 7, characterized by, The first powder concentrator outlet is connected with the roller press inlet through the weighing bin, so that the first powder concentrator outlet and the raw material are mixed and then sent to the roller press inlet through the hoist.

9. The steel slag, slag powder preparation system according to claim 1, characterized by, The fourth powder concentrator outlet is connected with the ball mill inlet, so that the semi-finished product after sorting is sent to the ball mill for grinding.

10. The steel slag, slag powder preparation system according to claim 1, characterized by, The first exhaust device comprises a static selection fan and a first exhaust cylinder, and the first powder collector outlet is connected with the static selection fan inlet, and the static selection fan outlet is connected with the first exhaust cylinder; The second exhaust device comprises a dynamic selection fan and a second exhaust cylinder, and the second powder collector outlet is connected with the dynamic selection fan inlet, and the dynamic selection fan outlet is connected with the second exhaust cylinder.

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