CN111560517A - Method for preparing alkaline pellet ore by using mine tailing fine mud - Google Patents
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/248—Binding; Briquetting ; Granulating of metal scrap or alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
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- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/242—Binding; Briquetting ; Granulating with binders
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Abstract
The invention relates to the field of pellet preparation processes, in particular to a method for preparing alkaline pellets by using mine tailing fine mud. The invention discloses a method for preparing alkaline pellets by using mine tailing fine mud, which comprises the following steps: 1) pretreatment of mine tailing fine mud: firstly, respectively stirring and sorting mine tailing fine mud to obtain sorted mine tailing fine mud; then concentrating, filtering, drying and high-pressure roller milling the separated fine mud of the mine tailings to obtain mine tailing powder; 2) preparing materials: mixing 3.3-4.5 parts of mine tailing powder, 100 parts of iron concentrate powder and 1.5-1.8 parts of binder according to parts by weight to obtain a mixture; 3) pelletizing: pelletizing the mixture by a disc pelletizer to obtain green pellets; 4) roasting: and conveying the green pellets to a chain grate machine for drying, preheating, roasting and cooling in sequence to obtain finished pellet ore. The alkaline pellet ore with alkalinity of 1.0-1.3 is prepared by recycling mine tailing fine mud.
Description
Technical Field
The invention relates to the field of pellet preparation processes, in particular to a method for preparing alkaline pellets by using mine tailing fine mud.
Background
Pellet ore is one of main raw materials for blast furnace ironmaking, and currently, common acidic pellet ore is mainly produced from pellet ore in China. The acid pellets are naturally alkaline pellets, SiO2And Al203The content of such elements is relatively high, and the content of alkaline substances such as calcium and magnesium is small, so that alkaline pellets are usually used in combination in order to balance the basicity of the slag in the blast furnace. The alkaline pellet ore is a ball-type iron-containing material which can meet the requirements of iron and steel smelting at present, and is obtained by mixing finely ground iron ore concentrate or other iron-containing powder with an additive or a binder according to a certain proportion, pelletizing, and then hardening and consolidating the mixture by adopting methods such as drying, roasting and the like, and related reports exist in the prior art for producing the pellet ore by utilizing mine tailing fine mud, for example, the invention patent application document with the application number of 201510508537.3 records '1', and the tailing powder with high CaO and MgO contents is obtained by treating the tailing mud through an ore dressing process; 2, pre-roasting the tailing powder; 3, preparing materials; 4, mixing and pelletizing; 5, roasting; however, the flux-type MgO pellet produced by the patent application has the binary alkalinity of below 0.7 and smaller alkalinity, and still cannot meet the requirements of alkaline pellets used for blast furnace iron making.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a method for preparing alkaline pellets by using mine tailing fine mud, which can be used for preparing alkaline pellets with alkalinity of 1.0-1.3 by recycling the mine tailing fine mud.
In order to achieve the purpose, the method for preparing the alkaline pellet ore by using the fine mud of the mine tailings comprises the following steps:
1) pretreatment of mine tailing fine mud: firstly, respectively stirring and sorting mine tailing fine mud raw materials to obtain sorted mine tailing fine mud; then concentrating, filtering, drying and high-pressure roller milling the separated fine mud of the mine tailings to obtain mine tailing powder;
2) preparing materials: mixing 3.3-4.5 parts of mine tailing powder, 100 parts of iron concentrate powder and 1.5-1.8 parts of binder according to parts by weight to obtain a mixture;
3) pelletizing: pelletizing the mixture by a disc pelletizer to obtain green pellets;
4) roasting: and conveying the green pellets to a chain grate machine for drying, preheating, roasting and cooling in sequence to obtain finished pellet ore.
As a preferred scheme, the raw material of the fine mud of the mine tailings in the step 1) is the fine mud of the tailings stacked in a tailings pond, and the raw material comprises the following components in percentage by mass: CaO is more than or equal to 42 percent, MgO is more than or equal to 9 percent, and SiO2≥5.65％。
As a preferable scheme, a chute sorting process is adopted in the sorting procedure in the step 1), the chute adopts a high-frequency vibration spiral chute, and the pitch h/D of the spiral chute is 0.32-0.6; the specific sorting process is as follows: the spiral chute is connected with the vibrator, the vibrator is started, the ore pulp is fed from the ore feeding hopper, the water is fed to the ore feeding hopper, the fed ore pulp is in centrifugal rotary motion downwards along a spiral line under the action of gravity, mineral particles vibrate in a reciprocating mode to increase the kinetic energy of the mineral particles, meanwhile, the mineral particles interact with each other, the coarse particle density and the fine particle density move inwards of the spiral chute, the fine particle density and the fine particle density move outwards of the spiral, the solid particles are loose under the action of weak turbulence, the separation principle of a flowing film is adopted for layering, and the heavy minerals entering the bottom layer are subjected to tank bottomThe influence of friction force, low movement speed and small centrifugal force inertia tend to move in the groove along the maximum inclined direction of the groove surface; the doped micro-particles are impacted to the upper layer by vibration, are accelerated by the action of water flow and are thrown to the outer side of the groove surface; heavy minerals and micro minerals gradually form a belt layer under the action of continuous vibration, the belt layer is flatly paved on the surface of the groove, the movement of mineral particles tends to be stable, and the belt layer separation is finished, so that the final separation is realized, and the mineral components of the fine mud of the mine tailings after the separation meet the conditions that CaO is more than or equal to 56 percent, MgO is more than or equal to 14.6 percent, and SiO2Less than or equal to 3.8 percent. The high-frequency vibration spiral chute separation process is adopted, and the mineral separation precision is high.
Preferably, the high-pressure roller milling in the step 1) enables the particle size of the mine tailing powder to reach 200 meshes to be more than 98%, and the 325 meshes to be more than 90-92%.
Preferably, the binder in the step 2) is bentonite or an organic binder.
Preferably, the particle size of the green pellets in the step 3) is 8-16 mm.
Preferably, the drying in step 4): the temperature is 250-350 ℃, and the time is 3-5 minutes; preheating: the temperature is 850-1050 ℃, and the time is 20-25 minutes; and (3) roasting: the temperature is 1200-1300 ℃, and the time is 12-18 minutes; and (3) cooling: the temperature is less than or equal to 150 ℃, and the time is 2-5 minutes. The preheating temperature is 850-1050 ℃, so that the carbonate is fully decomposed.
The invention has the advantages that: compared with the traditional process for producing the pellet by using the mine tailing fine mud, the invention comprehensively considers the alkalinity, the strength and the cost of the pellet, and adjusts the component proportion of the ingredients to obtain the pellet with the alkalinity of 1.0-1.3 and the compressive strength of more than 2548N/pellet; on one hand, the invention utilizes the high content of calcium and magnesium in the mine tailing fine mud to meet the alkalinity requirement, and uses a large amount of accumulated mine tailing fine mud to save the raw material cost for preparing the pellet; on the other hand, the characteristic of fine granularity of mine tailing fine mud is utilized, so that pelletizing of the pellets is facilitated, a binder can be partially replaced, and meanwhile, the addition of the binder is reduced, and the pellets can be reducedSiO in mine2、Al2O3The content of the components in the pellet further improves the compression strength of the pellet.
Drawings
FIG. 1 is a process flow chart of the invention for preparing alkaline pellets by using mine tailing fine mud.
Detailed Description
For a better understanding of the present invention, reference will now be made in detail to the present invention, examples of which are illustrated in the accompanying drawings.
Example 1
Referring to fig. 1, the method for preparing alkaline pellets from mine tailing fine mud comprises the following steps:
1) pretreatment of mine tailing fine mud: firstly, respectively stirring and sorting mine tailing fine mud to obtain sorted mine tailing fine mud; the stirring time is controlled for 30s, and the mine tailing mud is scrubbed, so that quartz sand particles and minerals in the mine tailing mud are effectively dispersed; the separation process adopts a chute separation process, the chute adopts a high-frequency vibration spiral chute, the pitch h/D of the spiral chute is 0.32, and the mineral components and the mass percentage of the separated mine tailing fine mud are CaO: 58 percent of MgO, 15.8 percent of SiO23.2 percent, and high-content CaO and MgO and low-content SiO are obtained by a chute separation process2。
Then concentrating, filtering and drying the separated fine mud of the mine tailings, and grinding the dried alkaline minerals bonded into cakes to obtain mine tailing powder, so that the mine tailing powder is loosened and the fineness of the mine tailing powder is further improved, wherein the proportion of the obtained tailings to 200 meshes is 99.2 percent, and the proportion of the tailings to 325 meshes is 91.4 percent.
2) Preparing materials: according to the mass parts, 34.1 parts of mine tailing powder, 100 parts of iron ore concentrate powder and 1.6 parts of bentonite are mixed to obtain a mixture;
3) pelletizing: pelletizing the mixture by a disc pelletizer to obtain green pellets, screening, and taking the green pellets with the thickness of 8-16 mm as qualified green pellets, wherein the falling strength of the qualified green pellets is 5.2 times/0.5 m on average;
4) roasting: conveying the green pellets to a chain grate machine to carry out drying, preheating, roasting and cooling processes in sequence to obtain finished pellet ores; drying at 250 deg.C for 3 min; preheating at 850 ℃ for 25 minutes; roasting: the temperature is 1200 ℃ and the time is 18 minutes; the cooling was 150 ℃ for 2 minutes.
In the pellet prepared in this example, the alkalinity of the pellet is 1.2 times; the MgO content is 0.58%, and the compressive strength can reach more than 2564N/ball.
Example 2
Referring to fig. 1, the method for preparing alkaline pellets from mine tailing fine mud comprises the following steps:
1) pretreatment of mine tailing fine mud: firstly, respectively stirring and sorting mine tailing fine mud to obtain sorted mine tailing fine mud; the stirring time is controlled for 60s, and the mine tailing mud is scrubbed, so that quartz sand particles and minerals in the mine tailing mud are effectively dispersed; the separation process adopts a chute separation process, the chute adopts a high-frequency vibration spiral chute, the pitch h/D of the spiral chute is 0.4, and the mineral components and the mass percentage of the separated mine tailing fine mud are CaO: 62%, MgO: 15.6% of SiO2: 2.4 percent, and high-content CaO and MgO and low-content SiO are obtained by a chute sorting process2。
And then concentrating, filtering and drying the separated fine mud of the mine tailings, and grinding the dried alkaline minerals bonded into cakes to obtain mine tailing powder, so that the mine tailing powder is loosened and the fineness of the mine tailing powder is further improved, wherein the proportion of the obtained tailings to 200 meshes is 98.9 percent, and the proportion of the tailings to 325 meshes is 91.9 percent.
2) Preparing materials: mixing 3.9 parts of mine tailing powder, 100 parts of iron ore concentrate powder and 1.8 parts of binder according to parts by weight to obtain a mixture;
3) pelletizing: pelletizing the mixture by a disc pelletizer to obtain green pellets, screening, and taking the green pellets with the diameter of 8-16 mm as qualified green pellets, wherein the falling strength of the qualified green pellets is 4.9 times/0.5 m on average;
4) roasting: conveying the green pellets to a chain grate machine to carry out drying, preheating, roasting and cooling processes in sequence to obtain finished pellet ores; drying at 350 deg.C for 3 min; preheating to 1050 ℃ for 20 minutes; roasting: the temperature is 1200 ℃ and the time is 18 minutes; the cooling was 100 ℃ for 5 minutes.
In the pellet prepared in the embodiment, the alkalinity of the pellet is 1.15 times; the MgO content is 0.62%, and the compressive strength can reach more than 2548N/ball.
Example 3
Referring to fig. 1, the method for preparing alkaline pellets from mine tailing fine mud comprises the following steps:
1) pretreatment of mine tailing fine mud: firstly, respectively stirring and sorting mine tailing fine mud to obtain sorted mine tailing fine mud; the stirring time is controlled to be 45s, the mine tailing mud is scrubbed, and quartz sand particles and minerals in the mine tailing mud are effectively dispersed; the separation process adopts a chute separation process, the chute adopts a high-frequency vibration spiral chute, the pitch h/D of the spiral chute is 0.5, and the mineral components and the mass percentage of the separated mine tailing fine mud are CaO: 57.5%, MgO: 15.6% of SiO2: 3.1 percent, and high-content CaO and MgO and low-content SiO are obtained by a chute sorting process2。
Then concentrating, filtering and drying the separated fine mud of the mine tailings, and grinding the dried alkaline minerals bonded into cakes to obtain mine tailing powder, so that the mine tailing powder is loosened and the fineness of the mine tailing powder is further improved, wherein the proportion of-200 meshes of the obtained tailings is 99.0 percent, and the proportion of-325 meshes of the obtained tailings is 90.4 percent.
2) Preparing materials: mixing 3.5 parts of mine tailing powder, 100 parts of iron ore concentrate powder and 1.6 parts of binder according to parts by weight to obtain a mixture;
3) pelletizing: pelletizing the mixture by a disc pelletizer to obtain green pellets, screening, and taking the green pellets with the diameter of 8-16 mm as qualified green pellets, wherein the falling strength of the qualified green pellets is 5.1 times/0.5 m on average;
4) roasting: conveying the green pellets to a chain grate machine to carry out drying, preheating, roasting and cooling processes in sequence to obtain finished pellet ores; drying at 300 deg.C for 4 min; preheating at 900 ℃ for 22 minutes; roasting: the temperature is 1250 ℃ and the time is 15 minutes; the cooling was 120 ℃ for 3 minutes.
In the pellet prepared in the embodiment, the alkalinity of the pellet is 1.3 times; the MgO content is 0.68%, and the compressive strength can reach more than 2554N/ball.
Example 4
Referring to fig. 1, the method for preparing alkaline pellets from mine tailing fine mud comprises the following steps:
1) pretreatment of mine tailing fine mud: firstly, respectively stirring and sorting mine tailing fine mud to obtain sorted mine tailing fine mud; the stirring time is controlled for 40s, and the mine tailing mud is scrubbed, so that quartz sand particles and minerals in the mine tailing mud are effectively dispersed; the separation process adopts a chute separation process, the chute adopts a high-frequency vibration spiral chute, the pitch h/D of the spiral chute is 0.6, and the mineral components and the mass percentage of the separated mine tailing fine mud are CaO: 58% of MgO, 15.7% of SiO2: 3.1 percent, and high-content CaO and MgO and low-content SiO are obtained by a chute sorting process2。
Then concentrating, filtering and drying the separated mine tailing fine mud, and grinding the dried alkaline minerals bonded into cakes to obtain mine tailing powder, so that the mine tailing powder is loosened and the fineness of the mine tailing powder is further improved, wherein the proportion of-200 meshes of the obtained tailings is 98.2%, and the proportion of-325 meshes of the obtained tailings is 92%.
2) Preparing materials: mixing 4.0 parts of mine tailing powder, 100 parts of iron ore concentrate powder and 1.6 parts of binder according to parts by weight to obtain a mixture;
3) pelletizing: pelletizing the mixture by a disc pelletizer to obtain green pellets, screening, and taking the green pellets with the thickness of 8-16 mm as qualified green pellets, wherein the falling strength of the qualified green pellets is 5.0 times/0.5 m on average;
4) roasting: conveying the green pellets to a chain grate machine to carry out drying, preheating, roasting and cooling processes in sequence to obtain finished pellet ores; drying at 320 deg.C for 3.5 min; preheating at 900 ℃ for 22 minutes; roasting: the temperature is 1220 ℃, and the time is 13 minutes; the cooling was 90 ℃ for 5 minutes.
In the pellet prepared in this example, the alkalinity of the pellet is 1.0 time; the MgO content is 0.56%, and the compressive strength can reach more than 2585N/ball.
Example 5
Referring to fig. 1, the method for preparing alkaline pellets from mine tailing fine mud comprises the following steps:
1) pretreatment of mine tailing fine mud: firstly, respectively stirring and sorting mine tailing fine mud to obtain sorted mine tailing fine mud; the stirring time is controlled for 50s, and the mine tailing mud is scrubbed, so that quartz sand particles and minerals in the mine tailing mud are effectively dispersed; the separation process adopts a chute separation process, the chute adopts a high-frequency vibration spiral chute, the pitch h/D of the spiral chute is 0.35, and the mineral components and the mass percentage of the separated mine tailing fine mud are CaO: 58%, MgO: 14.9% of SiO2: 3.7 percent, and high-content CaO and MgO and low-content SiO are obtained by a chute sorting process2。
Then concentrating, filtering and drying the separated fine mud of the mine tailings, and grinding the dried alkaline minerals bonded into cakes to obtain mine tailing powder, so that the mine tailing powder is loosened and the fineness of the mine tailing powder is further improved, wherein the proportion of the obtained tailings to 200 meshes is 98.9 percent, and the proportion of the tailings to 325 meshes is 90.4 percent.
2) Preparing materials: mixing 3.3 parts of mine tailing powder, 100 parts of iron ore concentrate powder and 1.5 parts of binder according to parts by weight to obtain a mixture;
3) pelletizing: pelletizing the mixture by a disc pelletizer to obtain green pellets, screening, and taking the green pellets with the thickness of 8-16 mm as qualified green pellets, wherein the falling strength of the qualified green pellets is 5.0 times/0.5 m on average;
4) roasting: conveying the green pellets to a chain grate machine to carry out drying, preheating, roasting and cooling processes in sequence to obtain finished pellet ores; drying at 300 deg.C for 4 min; preheating at 1000 ℃ for 20 minutes; roasting: the temperature is 1300 ℃, and the time is 15 minutes; the cooling was at 130 ℃ for 3 minutes.
In the pellet prepared in this example, the alkalinity of the pellet was 1.25 times; the MgO content is 0.68%, and the compressive strength can reach more than 2568N/ball.
From the above examples, it can be seen that the alkalinity (CaO/SiO) of the alkaline pellets obtained by the method for preparing alkaline pellets from fine slime of mine tailings2The ratio of (1) to (1.0-1.3) times, the compressive strength of the ball is more than 2548N/ball, and the alkalinity and the compressive strength of the ball are all fullThe method meets the requirement of alkaline pellets used in blast furnace ironmaking, but compared with the traditional alkaline pellets made of materials such as slaked lime and the like, the method takes the mine tailing fine mud as the preparation material, thereby reducing the cost.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (7)
1. A method for preparing alkaline pellets by using fine mud of mine tailings comprises the following steps:
1) pretreatment of mine tailing fine mud: firstly, respectively stirring and sorting mine tailing fine mud raw materials to obtain sorted mine tailing fine mud; then concentrating, filtering, drying and high-pressure roller milling the separated fine mud of the mine tailings to obtain mine tailing powder;
2) preparing materials: mixing 3.3-4.5 parts of mine tailing powder, 100 parts of iron concentrate powder and 1.5-1.8 parts of binder according to parts by weight to obtain a mixture;
3) pelletizing: pelletizing the mixture by a disc pelletizer to obtain green pellets;
4) roasting: and conveying the green pellets to a chain grate machine for drying, preheating, roasting and cooling in sequence to obtain finished pellet ore.
2. The method for preparing alkaline pellets from mine tailing fine mud according to claim 1, wherein the mine tailing fine mud in the step 1) is prepared from tailing fine mud accumulated in a tailing pond, and comprises the following components in percentage by mass: CaO is more than or equal to 42 percent, MgO is more than or equal to 9 percent, and SiO2≥5.65％。
3. The method for preparing alkalinity by using mine tailing fine mud according to claim 1The method for the pellets is characterized in that a chute sorting process is adopted in the sorting procedure in the step 1), a high-frequency vibration spiral chute is adopted as the chute, the pitch h/D of the spiral chute is 0.32-0.6, and the mineral components of the mine tailing fine mud after sorting meet the conditions that CaO is more than or equal to 56 percent, MgO is more than or equal to 14.6 percent, and SiO is more than or equal to 14.6 percent2≤3.8％。
4. The method for preparing alkaline pellets from mine tailing fine mud according to claim 1, wherein the high-pressure roller milling in the step 1) enables the grain size of the mine tailing powder to reach 200 meshes to be more than 98%, and 325 meshes to be more than 90-92%.
5. The method for preparing alkaline pellets from the mine tailing fine mud as claimed in claim 1, wherein the binder in the step 2) is bentonite or an organic binder.
6. The method for preparing alkaline pellets from the mine tailing fine mud according to claim 1, wherein the particle size of the green pellets in the step 3) is 8-16 mm.
7. The method for preparing alkaline pellets by using the mine tailing fine mud as claimed in claim 1, wherein the drying in the step 4): the temperature is 250-350 ℃, and the time is 3-5 minutes; preheating: the temperature is 850-1050 ℃, and the time is 20-25 minutes; and (3) roasting: the temperature is 1200-1300 ℃, and the time is 12-18 minutes; and (3) cooling: the temperature is less than or equal to 150 ℃, and the time is 2-5 minutes.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102586586A (en) * | 2012-03-09 | 2012-07-18 | 中南大学 | Method for magnetizing, roasting and sorting low-grade iron ores |
| CN104195328A (en) * | 2014-07-31 | 2014-12-10 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Method for preparing iron oxide ore reduction roasting green ball by using iron selection tailings |
| CN105039681A (en) * | 2015-08-24 | 2015-11-11 | 山西太钢不锈钢股份有限公司 | Method for manufacturing alkaline magnesium-rich pellet ore |
| CN106000638A (en) * | 2016-05-20 | 2016-10-12 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Process for extracting iron from comprehensive tailings of refractory iron ores |
-
2020
- 2020-04-13 CN CN202010287710.2A patent/CN111560517A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102586586A (en) * | 2012-03-09 | 2012-07-18 | 中南大学 | Method for magnetizing, roasting and sorting low-grade iron ores |
| CN104195328A (en) * | 2014-07-31 | 2014-12-10 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Method for preparing iron oxide ore reduction roasting green ball by using iron selection tailings |
| CN105039681A (en) * | 2015-08-24 | 2015-11-11 | 山西太钢不锈钢股份有限公司 | Method for manufacturing alkaline magnesium-rich pellet ore |
| CN106000638A (en) * | 2016-05-20 | 2016-10-12 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Process for extracting iron from comprehensive tailings of refractory iron ores |
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Application publication date: 20200821 |