A method for enriching metallic iron from converter dust removal ash

Abstract

The present invention relates to the technical field of comprehensive utilization of waste resources, and in particular to a method for enriching metallic iron in converter dust ash. Specifically, the following steps are included: mixing converter dust ash with water to form sludge; using a permanent magnetic separator to magnetically separate the sludge, and obtaining iron-containing materials and tailings sludge after magnetic separation; adding the iron-containing materials to a stirring barrel from top to bottom, and after fully stirring the iron-containing materials, the metallic iron materials and tailings sludge are separated and discharged from the upper and lower outlets of the stirring barrel respectively, and enter a material collection pool; the circulating water in the material collection pool takes away the tailings sludge in the material collection pool, and the material in the material collection pool is finally enriched with metallic iron. The present invention can effectively separate metallic iron particles through magnetic separation and stirring, greatly increase the content of metallic iron, and enrich the metallic iron in converter dust ash. And the process adopted by the present invention can realize large-scale industrial production, and has high practicality and promotion prospects.

Description

Technical Field

[0001] The invention relates to the technical field of comprehensive utilization of waste resources, in particular to a method for enriching metallic iron in converter dust removal ash. Background Art

[0002] At present, the main treatment technologies for converter dust removal ash include returning it to sintering and pelletizing as raw materials for ironmaking, pressing it into blocks and returning it to the converter as coolant, and other internal circulation in steel mills. Elements such as K, Na, and Zn in dust removal ash will have an adverse effect on blast furnace smelting, and elements such as P and S will have an adverse effect on steel quality. The internal recycling of dust removal ash in steel mills is not only not conducive to steel production, but also has low added value.

[0003] The converter dust is processed by spraying water or other collection methods to form mud. The metallic iron content is 15-20%. The metallic iron content is low, and it is difficult to use the metallic iron alone. It can only be pressed into cold solidified pellets and returned to the blast furnace. The mud has a large water content. It is often used to add a million-level high molecular weight network organic flocculant to the mud, so that the flocculant becomes a gel point in the mud, and the material and sludge are aggregated together and sink to separate the clean water. The clean water is recycled, and the mud is magnetically separated by a magnetic separator. However, due to the effect of the flocculant, the viscosity of the water increases, and the separation of metal particles and mud becomes more difficult.

[0004] Therefore, in order to effectively recycle the metallic iron in the converter dust, it is of great theoretical and practical significance to provide a method that can quickly separate metal particles and slurry and effectively enrich the metallic iron in the converter dust. Summary of the invention

[0005] The object of the present invention is to provide a method for enriching metallic iron in converter dust ash, which method can effectively separate metallic iron and mud, and conveniently and effectively enrich metallic iron in converter dust ash.

[0006] The present invention provides a method for enriching metallic iron in converter dust removal ash, comprising the following steps:

[0007] Step 1: Mixing converter dust removal ash with water to form sludge;

[0008] Step 2: Using a permanent magnetic separator to magnetically separate the sludge obtained in step 1, and obtaining iron-containing materials and tailings sludge after magnetic separation;

[0009] Step 3: Add the iron-containing material into the mixing barrel from top to bottom, and after the iron-containing material is fully stirred, the metallic iron material and the tailings slurry are separated; the metallic iron material is discharged from the lower outlet of the mixing barrel, and the tailings slurry is discharged from the upper outlet of the mixing barrel and enters the material collection pool;

[0010] Step 4: There is circulating water inside the material collection pool. After the circulating water takes away the tailings slurry in the material collection pool, the material in the material collection pool is finally enriched with metallic iron.

[0011] Preferably, the magnetic field strength of the permanent magnet separator is 1000-1400 Gauss.

[0012] Preferably, in step 3, the iron-containing material stays in the stirring barrel for 15-20 minutes.

[0013] Preferably, two corresponding outlets are arranged on the side of the mixing barrel, namely an upper outlet and a lower outlet.

[0014] Preferably, the stirring barrel has a height of 600-1000 mm and a diameter of 400-800 mm.

[0015] Preferably, a motor is connected to the top end of the stirring shaft of the stirring barrel, and the motor is a three-phase asynchronous motor with a rated speed of 1420 r / min.

[0016] Preferably, the side of the material collection pool away from the mixing barrel is the tail end, and a discharge port is provided, and a mud pump is provided at the discharge port.

[0017] Preferably, the mud pump is connected to a float switch.

[0018] Preferably, a detachable baffle is provided outside the discharge port.

[0019] Preferably, the metallic iron content of the metallic iron material in the material collection pool in step 4 is 60-65%.

[0020] Beneficial effects:

[0021] The present invention can effectively separate metallic iron materials and tailings slurry through magnetic separation and stirring, greatly increasing the content of metallic iron, conveniently and effectively enriching metallic iron in converter dust removal ash, and improving the utilization rate of converter dust removal ash. Moreover, the process adopted by the present invention can realize large-scale industrial production, and has high practicality and promotion prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a schematic diagram of the process flow of the present invention;

[0024] Figure 2It is a schematic diagram of the positional relationship between the stirring barrel and the material collecting pool in the present invention.

[0025] Description of reference numerals:

[0026] 1-mixing barrel, 2-motor, 3-lower outlet, 4-upper outlet, 5-material collection tank, 6-float switch, 7-mud pump, 8-baffle. DETAILED DESCRIPTION

[0027] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0029] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] Example 1

[0031] like Figure 1 As shown, a method for enriching metallic iron from converter dust removal ash comprises the following steps:

[0032] Step 1: Spray water onto the converter dust ash and add flocculant thereto to mix the converter dust ash with water to form sludge, so as to facilitate collection of the converter dust ash. The obtained sludge has a metallic iron content of 15-20%;

[0033] Step 2: Using a permanent magnetic separator to magnetically separate the sludge obtained in step 1, during the magnetic separation process, evenly spraying flushing water on the entire working surface of the permanent magnetic separator can enhance the magnetic separation effect, and after magnetic separation, iron-containing materials and tailings sludge are obtained, and the metallic iron content in the iron-containing materials increases to 45-50%;

[0034] The permanent magnetic separator used has a diameter of 800mm, a length of 1800mm, and a magnetic field strength of 1000-1400 Gauss;

[0035] Step 3: Add the iron-containing material into the mixing barrel 1 from top to bottom. The height of the mixing barrel 1 is 600-1000mm, the diameter is 400-800mm, and two upper and lower corresponding outlets are set on the side. Both outlets are tilted downward, namely the upper outlet 4 and the lower outlet 3. The height difference between the upper outlet 4 and the lower outlet 3 can make the speed and landing distance of the discharged material different, which is convenient for separating the materials discharged from the upper outlet 4 and the lower outlet 3. The stirring shaft in the mixing barrel 1 is vertically arranged, and the top of the stirring shaft is connected to the motor 2. The motor 2 adopts a three-phase asynchronous motor with a power of 3kw and a rated speed of 1420r / min. The speed of the motor 2 is controlled by the inverter to achieve high-speed stirring of the iron-containing material. The mixing barrel 1 is located above one side of the material collection pool 5.

[0036] The iron-containing material stays in the mixing barrel 1 for 15-20 minutes, during which time the iron-containing material is fully stirred. During the stirring process, the iron-containing material forms a high-speed flow state, which can effectively separate the metal material and break up the tailings sludge. The metallic iron material has a large specific gravity and gradually sinks; the tailings sludge has a small specific gravity and gradually floats up, and the metallic iron material and the tailings sludge are separated; the metallic iron material is discharged from the lower outlet 3, and the tailings sludge is discharged from the upper outlet 4, and they enter the material collection pool 5 together, which can effectively save space. Due to the difference in specific gravity and discharge speed, the landing point of the metallic iron material is closer to the side of the material collection pool 5, and the tailings sludge falls above the metallic iron material;

[0037] Step 4: The side of the material collection pool 5 away from the mixing barrel 1 is the tail end, and a discharge port is provided. A mud pump 7 is provided at the discharge port, and the mud pump 7 is connected to a float switch 6, which is convenient for controlling the switch of the mud pump 7, and then adjusting the water level in the material collection pool 5. A detachable baffle 8 is provided outside the discharge port, and the baffle 8 can be connected in a common detachable manner such as plug-in, which can control the switch simply and conveniently.

[0038] When the metallic iron material is discharged from the lower outlet 3 of the mixing barrel 1, it is easy to carry part of the tailings slurry into the material collection pool 5. The tailings slurry discharged from the upper outlet 4 of the mixing barrel 1 will also carry a small amount of metallic iron material. Entering the material collection pool 5 together can effectively avoid the loss of metallic iron material. The material collection pool 5 is provided with circulating water on the side away from the mixing barrel 1. The circulating water can clean the metallic iron material and further take away the tailings slurry therein. The metallic iron material, tailings slurry and circulating water are distributed in a stepped manner in the material collection pool 5, and their positional relationship is as shown in FIG. Figure 2 As shown. The circulating water can fully carry away the tailings slurry in the material collection pool 5, and the circulating water is discharged after cleaning. The final material in the material collection pool 5 is enriched with metallic iron. According to the test, the metallic iron content of the final material in the material collection pool 5 is 60-65%. The treatment in the material collection pool 5 can ensure the stability of the increase in the metallic iron content, so that the enrichment effect of metallic iron in the converter dust removal ash is more stable, which is conducive to the subsequent recycling of the metallic iron therein.

[0039] Metallic iron content detection

[0040] Five samples of the products from different treatment stages of the converter dust removal ash were taken for testing of the metallic iron content. The products included the sludge obtained in step one, the iron-containing material after magnetic separation in step two, and the final material obtained in step four. The test results are shown in Table 1.

[0041] Table 1

[0042] Serial number sludge Iron-containing materials Final material 1 16.71 42.15 62.15 2 18.24 43.28 64.32 3 16.56 42.11 62.61 4 15.79 43.67 63.82 5 18.54 44.58 61.47 average 17.17 43.16 62.87

[0043] It can be seen from the above data that the enrichment method provided by the present invention uses the method of first magnetic separation and then stirring to conveniently and effectively break up the flocculant, separate the metallic iron material and the tailings slurry, make full use of the converter dust removal ash to enrich the metallic iron, and increase the metallic iron content to more than 60%, which is convenient for subsequent recycling and utilization, and has broad application prospects.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for enriching metallic iron from converter dust, characterized in that: The following steps are involved: Step 1: Mixing converter dust removal ash with water to form sludge; Step 2: Using a permanent magnetic separator to magnetically separate the sludge obtained in step 1, and obtaining iron-containing materials and tailings sludge after magnetic separation; Step 3: Add the iron-containing material into the mixing barrel from top to bottom, stir the iron-containing material thoroughly, separate the metallic iron material from the tailings slurry, and keep the iron-containing material in the mixing barrel for 15-20 minutes; The side of the mixing barrel is provided with two corresponding upper and lower outlets, namely an upper outlet and a lower outlet, and both outlets are inclined downward; the metallic iron material is discharged from the lower outlet of the mixing barrel, and the tailings slurry is discharged from the upper outlet of the mixing barrel and enters the material collection pool; Step 4: Circulating water is provided inside the material collection pool. The side of the material collection pool away from the mixing barrel is the tail end. Circulating water and a discharge port are provided. A mud pump is provided at the discharge port. The mud pump is connected to a float switch. After the circulating water takes away the tailings mud in the material collection pool, the material in the material collection pool is finally enriched with metallic iron.

2. The method according to claim 1, characterized in that The magnetic field strength of the permanent magnetic separator is 1000-1400 Gauss.

3. The method according to claim 1, characterized in that The mixing barrel has a height of 600-1000 mm and a diameter of 400-800 mm.

4. The method according to claim 1, characterized in that The top end of the stirring shaft of the stirring barrel is connected to a motor, and the motor is a three-phase asynchronous motor with a rated speed of 1420r / min.

5. The method according to claim 1, characterized in that A detachable baffle is arranged outside the discharge port.

6. The method according to claim 1, characterized in that In step 4, the metallic iron content of the metallic iron material in the material collection pool is 60-65%.

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