CN115637302A - Blast furnace smelting method of vanadium titano-magnetite suitable for high zinc, high lead and high alkali conditions - Google Patents
Blast furnace smelting method of vanadium titano-magnetite suitable for high zinc, high lead and high alkali conditions Download PDFInfo
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Abstract
The invention discloses a blast furnace smelting method of vanadium titano-magnetite suitable for high-zinc, high-lead and high-alkali conditions, relates to the technical field of blast furnace smelting, and solves the problems that the existing blast furnace iron-making method has low production efficiency under the high-zinc, high-lead and high-alkali conditions, and the existing coping mode has high production cost and high energy consumption, and the method specifically comprises the following steps of S1, taking raw materials according to a preset proportion to obtain an initial material; s2, measuring elements of the initial material according to a preset time interval to obtain a first raw material; s3, the first raw material is put into a blast furnace for smelting, the content of harmful elements in the raw material introduced into the blast furnace is controlled by measuring elements of the preset material and reaching a preset value, and the magnesium-containing sinter is introduced by adjusting the proportion of the preset raw material, so that the MgO content in the slag is 8.1-8.8%, and the K content in the slag is reduced 2 O、Na 2 O activity, the ratio of magnesium to aluminum in the slag being 0.6-0.65, gives good flow of slagThe fluidity ensures that the slag has good alkali discharge capacity.
Description
Technical Field
The invention relates to the technical field of blast furnace smelting, in particular to a blast furnace smelting method of vanadium-titanium magnetite suitable for high-zinc, high-lead and high-alkali conditions.
Background
The blast furnace has wide sources of harmful elements, wherein Zn and Pb elements are mainly brought in from ores, and K 2 O，Na 2 O is mainly carried in from coal dust and coke. The harmful elements can be circularly enriched under the reducing atmosphere of the blast furnace to cause accretion in the furnace, the coke strength is reduced, cloth bag pipelines are blocked, the smooth running of the blast furnace is reduced, the cost is greatly increased, and the carbon bricks at the furnace bottom (Pb) can be damaged when the harmful elements are serious, so that the service life of the first-generation furnace life can be directly threatened.
The prior art mainly controls Zn, pb and K in raw materials entering a furnace 2 O+Na 2 And (4) controlling the harm caused by harmful elements by taking measures of O load and periodic alkali discharge. But with low harmful elements (the load of most blast furnace Zn in China is controlled below 0.9kg/t.Fe, K 2 O+Na 2 Fe) with the O load controlled at 4kg/t, and the price of the ore is increased, if the harmful element control standard is met, the production cost of the blast furnace is necessarily greatly reducedThe degree is increased, and the purchasing surface of blast furnace smelting ores is reduced.
Aiming at the problems, the invention designs a blast furnace smelting method of vanadium-titanium magnetite which is suitable for high zinc, high lead and high alkali conditions.
Disclosure of Invention
The invention aims to: in order to solve the problems of low production efficiency of the existing blast furnace iron-making method under the conditions of high zinc, high lead and high alkali, high production cost and high energy consumption of the existing corresponding mode, the invention provides the blast furnace iron-making method suitable for the vanadium-titanium magnetite under the conditions of high zinc, high lead and high alkali, the content of harmful elements in raw materials introduced into a blast furnace is controlled by carrying out element measurement on preset materials and reaching a preset value, meanwhile, magnesium-containing sinter is introduced by adjusting the proportion of the preset raw materials, so that the MgO content in the slag is 8.1-8.8%, and the magnesium-aluminum ratio of the slag reaches 0.6-0.65, so that the slag has good fluidity, has good alkali discharge capacity, and simultaneously reduces the K in the slag 2 O、Na 2 The activity of O reduces the circulating enrichment capacity of alkali metal and the corrosion capacity of a furnace lining and improves the alkali discharge capacity of slag.
The invention specifically adopts the following technical scheme for realizing the purpose:
a blast furnace smelting method of vanadium titano-magnetite suitable for high zinc, high lead and high alkali conditions comprises the following steps: s1, taking raw materials according to a preset proportion to obtain an initial material; s2, measuring elements of the initial material according to a preset time interval to obtain a first raw material; and S3, putting the first raw material into a blast furnace for smelting.
Optionally, the initial material comprises 50-58% of magnesium-containing sinter ore, 38-45% of pellet ore and 5-15% of raw ore.
Optionally, 2.8-3.2% of Mgo is contained in each part of the magnesium-containing sinter.
Optionally, the specific indexes of the elements are that Zn is less than or equal to 1.3Kg/t.Fe; k is 2 O+Na 2 O is less than 6.5kg/tFe; pb is less than 0.55kg/tFe, and the product can be used as the first raw material.
Optionally, in S3, adjusting a slagging system and adjusting distribution of a gas flow are included.
Optionally, the slagging system comprises: so that the contents of TiO2 and MgO in the slag system of the furnace slag are 16 to 19 percent and 8.1 to 8.8 percent respectively, and the magnesium-aluminum ratio of the furnace slag is 0.6 to 0.65.
Optionally, the adjusting of the distribution of the coal gas flow is to set a coal gas flow in the center and at the edge of the blast furnace respectively.
Optionally, the step S3 further includes adding one or a combination of a gravity dust removal device, a cyclone dust removal device, or a cloth bag dust removal device.
Compared with the prior art, the invention has the advantages that:
1. the invention relates to a blast furnace smelting method of vanadium titano-magnetite suitable for high zinc, high lead and high alkali conditions, which effectively reduces the content of harmful elements in finished products by carrying out element determination on preset materials and reaching the preset values, and controls the content of harmful elements in raw materials introduced into a blast furnace from the source; furthermore, the magnesium-containing sinter is introduced by adjusting the proportion of the preset raw materials, so that the MgO content in the slag is 8.1-8.8%, the magnesium-aluminum ratio of the slag reaches 0.6-0.65, the slag has good fluidity, and the slag has good alkali discharge capacity, thereby reducing the accumulation of harmful elements in the blast furnace; meanwhile, mgO can inhibit the activity of alkali metal, increase the content of MgO and reduce K in slag 2 O、Na 2 The activity of O reduces the circulating enrichment capacity of accumulated alkali metal in the blast furnace and the erosion capacity of a furnace lining, thereby reducing the damage to blast furnace equipment; therefore, the invention reduces the accumulation of zinc, lead and alkali through multiple dimensions, reduces the damage of high zinc, high lead and high alkali to smelting equipment, and solves the problems of low production efficiency under the conditions of high zinc, high lead and high alkali, high production cost and high energy consumption of the existing coping method; meanwhile, the method is simple and low in cost.
2. The invention relates to a blast furnace smelting method of vanadium-titanium magnetite suitable for high-zinc, high-lead and high-alkali conditions, which is characterized in that the ratio of preset raw materials is adjusted to introduce magnesium-containing sinter, mgO can inhibit the activity of alkali metal, the MgO content in slag is 8.1-8.8%, and the MgO content in slag can be enabled to be 8.1-8.8%K in slag 2 O、Na 2 The activity of O is greatly reduced, and the circulating enrichment capacity of alkali metal and the erosion capacity of a furnace lining are reduced; furthermore, the magnesium-aluminum ratio of the slag reaches 0.6-0.65, so that the slag has good fluidity, the slag has good alkali discharge capacity due to the good fluidity, and K in equipment can be ensured 2 O、Na 2 The enrichment of O is less; from reduction of harmful elements (K) 2 O、Na 2 O) activity and reduction of harmful elements (K) 2 O、Na 2 O), reduces the harm of harmful elements to blast furnace iron making, and is suitable for blast furnace smelting under the conditions of high zinc, high lead and high alkali.
Drawings
FIG. 1 is a schematic flow diagram of a blast furnace smelting method of vanadium titano-magnetite suitable for high zinc, high lead and high alkali conditions.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are some, but not all embodiments of the present invention.
Thus, the following detailed description of the embodiments of the present invention is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Detailed Description
The higher content of harmful elements in the blast furnace causes the following harm to the smelting process:
1. the zinc is circularly enriched in the blast furnace, which seriously affects the smooth operation and the stability of a thermal system of the blast furnace, and the zn steam permeating into a furnace lining is condensed in the furnace lining to cause a series of consequences such as the rising of a brick lining at the bottom of a blast furnace hearth, the upwarp cracking of a tuyere large sleeve, the upwarp deformation of a middle sleeve, the cracking of a furnace shell, the rising of a water temperature difference of the furnace hearth and the like, thereby seriously harming the service life of the first-generation blast furnace.
2. Causing cracking of the furnace shell and damage to the cooling plate. As harmful elements are enriched in the furnace, the harmful elements are adsorbed or permeated into brick joints near the soft melting zone at the middle lower part of the furnace body, so that brick linings are corroded and abnormally expanded, and the cooling plate is exposed in high-temperature airflow and is easy to damage by impact. Along with the reduction of the quality of the original fuel, the amount of harmful elements entering the furnace is increased, the enrichment in the harmful elements is increased, and the damage to the brick lining is increased. The cracking of the furnace shell is mainly caused by the use of a raw material with high Zn content, and the enrichment of Zn in the furnace is known to be a main cause of cracking of the furnace shell of the hearth from the analysis of a tuyere binder sample.
3. Pressure equalizing and pipeline blocking. Because the zn content is greatly increased, zn discharged with the coal gas is increased, and zn elements escaping with the coal gas are aggregated in the pressure equalizing pipe, so that the pipe is blocked.
4. Resulting in accelerated erosion of the hearth and the bottom of the furnace. Harmful elements such as alkali metal, zn and the like are easy to be circularly enriched in the furnace, K and Na are adhered to a furnace lining in a liquid or solid powdery compound to damage a brick lining, zn permeates into gaps of the brick lining in a steam form, and the lining is damaged by volume expansion after condensation and oxidation into ZnO, so that high-temperature molten iron can smoothly permeate into the brick joints to cause the rise of water temperature difference.
5. The coke strength is damaged, and the smooth degree of the furnace condition is reduced. The alkali metal adsorption is started from the air holes of the coke firstly, then gradually diffuses towards the interior of the coke along with the prolonging of the exposure time of the coke in the alkali metal steam, the adsorption amount of the alkali metal is gradually increased, the alkali metal diffused by the matrix part of the coke can erode the interior of a graphite crystal, the original structure is damaged, the coke generates larger volume expansion, the coke is broken, the reactivity of the coke is increased, and the strength is reduced after the reaction.
Pb element can enrich and destroy carbon bricks at the bottom of the furnace, so that refractory material floats to shorten the furnace life of the first generation.
Therefore, referring to fig. 1, the blast furnace smelting method of vanadium titano-magnetite suitable for high zinc, high lead and high alkali conditions provided by the invention comprises the following steps:
s1, taking raw materials according to a preset proportion to obtain an initial material;
s2, measuring elements of the initial material according to a preset time interval to obtain a first raw material;
and S3, putting the first raw material into a blast furnace for smelting.
Specifically, the preferred time interval is 30 days, i.e., the elements are measured every 30 days.
Understandably, the content of harmful elements in the finished product is effectively reduced by carrying out element measurement on the preset material and reaching the preset value, and the content of the harmful elements in the raw material introduced into the blast furnace is controlled from the source; furthermore, the magnesium-containing sinter is introduced by adjusting the proportion of the preset raw materials, so that the MgO content in the slag is 8.1-8.8%, the magnesium-aluminum ratio of the slag reaches 0.6-0.65, the slag has good fluidity, and the slag has good alkali discharge capacity, thereby reducing the accumulation of harmful elements in the blast furnace; meanwhile, mgO can inhibit the activity of alkali metal, increase the content of MgO and reduce the activity of K2O and Na2O in the slag at the same time, and reduce the circulating enrichment capacity of the alkali metal accumulated in the blast furnace and the erosion capacity of the furnace lining, thereby reducing the damage to the blast furnace equipment; therefore, the method reduces the accumulation of zinc, lead and alkali and reduces the damage of high zinc, high lead and high alkali to smelting equipment through multiple dimensions, and solves the problems of low production efficiency, high production cost and high energy consumption of the existing coping method under the conditions of high zinc, high lead and high alkali; meanwhile, the method is simple and low in cost.
In some embodiments of the present invention, the initial material comprises 50-58% of magnesium-containing sintered ore, 38-45% of pellet ore and 5-15% of raw ore.
Specifically, the initial material comprises 50% of magnesium-containing sinter, 38% of pellet ore and 5% of raw ore.
Specifically, the initial material comprises 55% of magnesium-containing sinter, 40% of pellet ore and 10% of raw ore.
Specifically, the initial material comprises 58% of magnesium-containing sintered ore, 45% of pellet ore and 15% of raw ore.
In some embodiments of the present invention, 2.8-3.2% Mgo is contained per part of the magnesium-containing sintered ore.
Specifically, 2.8%, 3.0%, 3.1%, 3.2% Mgo is contained per part of the magnesium-containing sintered ore. The magnesium-containing sintered ore preferably contains Mgo in an amount of 3.2% per part.
Understandably, mgO can inhibit the activity of alkali metal, so that the MgO content in the slag is 8.1-8.8%, and K in the slag can be ensured 2 O、Na 2 The activity of O is greatly reduced, and the circulating enrichment capacity of alkali metal and the erosion capacity of a furnace lining are reduced; furthermore, the magnesium-aluminum ratio of the slag reaches 0.6-0.65, so that the slag has good fluidity, the good fluidity enables the slag to have good alkali discharge capacity, and K in equipment can be enabled to be 2 O、Na 2 Less enrichment of O; from reduction of harmful elements (K) 2 O、Na 2 O) activity and reduction of harmful elements (K) 2 O、Na 2 O), reduces the harm of harmful elements to blast furnace iron making, and is suitable for blast furnace smelting under the conditions of high zinc, high lead and high alkali.
In some embodiments of the present invention, the magnesium-containing sintered ore comprises, in parts by mass: 47.5 to 49.5 percent of TFe, 7 to 10 percent of FeO, and SiO 2 5～7％，TiO 2 4～7％，V 2 O 5 0.2～1％，Mgo2.8～3.2％。
In some embodiments of the present invention, the pellet comprises, in parts by mass: 52 to 55 percent of TFe, 1 to 2 percent of FeO and SiO 2 4～6％，TiO 2 10～12％，V 2 O 5 0.4 to 1 percent of water and 0.01 to 3.6 percent of water.
In some embodiments of the invention, the green ore comprises, in parts by mass: TFe 50-56%, siO 2 12～16％，TiO 2 0.4-0.8% and 2-3% of water.
Specifically, in order to increase the MgO content in the sintered ore, dolomite may be preferably added to the sintered ore in a predetermined ratio.
Optionally, the preset proportion of dolomite is: each part of magnesium-containing sinter contains 2-3 parts of dolomite.
Specifically, the preset proportion of dolomite is as follows: 2 parts, 2.5 parts, 2.8 parts and 3 parts of dolomite in each part of the magnesium-containing sinter.
In some embodiments of the invention, the element is measured specifically as Zn ≦ 1.3Kg/t.Fe；K 2 O+Na 2 O is less than 6.5kg/tFe; pb is less than 0.55kg/tFe, and the product can be used as the first raw material.
Specifically, the determination of the elements is that Zn is 1.1Kg/t.Fe; k 2 O+Na 2 O is 6.0kg/tFe; pb was 0.35kg/tFe.
Understandably, the specific indexes of the harmful elements entering the furnace are set, so that the harmful elements are ensured to be within an acceptable range of the furnace condition of the blast furnace, and the content of the harmful elements is effectively reduced.
In some embodiments of the present invention, the S3 includes adjusting a slagging system and adjusting a distribution of a gas flow.
In some embodiments of the invention, the slagging regime comprises: so that the slag system component of the furnace slag reaches TiO 2 16 to 19 percent of the content, 8.1 to 8.8 percent of MgO and 0.6 to 0.65 percent of magnesium-aluminum ratio of the slag.
Understandably, the MgO can inhibit the activity of alkali metal, the magnesium-aluminum ratio of the slag is between 0.6 and 0.65, so that the slag has good fluidity, the slag has good alkali discharge capacity, and the K can be effectively reduced 2 O、Na 2 The activity of O improves the alkali discharge capacity of the slag.
Specifically, the slagging system comprises: so that the slag system component of the furnace slag reaches TiO 2 16%, 18%, 19%, 8.1%, 8.7%, 8.8% MgO, and the ratio of Mg to Al in the slag is 0.6, 0.62, 0.65.
Understandably, when the contents of [ Ti ] + [ C ] and [ Ti ] + [ N ] in the slag are higher, the schreyerite can generate more TiC and TiN with high melting point in the blast furnace; further, the melting point of TiC and TiN reaches 3000 ℃. Because TiC and TiN compounds with high melting points can be preferentially stuck in gaps of a furnace lining and can effectively prevent harmful elements from contacting with the wall of a furnace cylinder after being stuck in the gaps of the furnace lining, the erosion resistance of refractory materials is improved to play a role in protecting the furnace, the service life of the refractory materials is prolonged, and the negative effect of the harmful elements on the smelting process is effectively reduced.
In some embodiments of the present invention, the adjusting the distribution of the gas flow is implemented by respectively arranging a gas flow in the center and the edge of the blast furnace.
Understandably, the center and the edge of the blast furnace are respectively provided with a gas flow, and part of harmful elements can be taken out of the furnace through the gas on the basis of matching with a slagging system to discharge alkali, so that the content of the harmful elements is further reduced.
In some embodiments of the present invention, the step S3 further comprises adding one or a combination of a gravity dust removal device, a cyclone dust removal device or a bag dust removal device.
Specifically, the S3 further comprises a cyclone dust removal device.
It can be understood that by adding one or a combination of a gravity dust removal device, a cyclone dust removal device or a bag dust removal device, the excessive sticking of the dust removal ash with high Zn content brought out by the blast furnace gas can be prevented from blocking the pipeline.
In some embodiments of the invention, the screening impact quantity of the first raw material is controlled to be below 60kg/s, and the sintering low-temperature reduction degradation rate is controlled to be not lower than 70%, so that the powder entering into the furnace can be greatly reduced, the furnace wall adhesion caused by the cyclic enrichment of Zn element and alkali metal can be reduced, the furnace wall nodulation can be prevented, and the negative effect of harmful elements on equipment can be reduced.
Example 1
When smelting vanadium-titanium-iron ore, harmful elements in a blast furnace are high, and in order to solve the problem, the method for adjusting smelting specifically comprises the following steps: the method comprises the following steps:
s1, taking raw materials according to a preset proportion to obtain an initial material; the specific preset proportion is as follows: the initial material comprises 50% of magnesium-containing sinter, 38% of pellet and 5% of raw ore.
S2, performing element determination on the initial material according to the frequency of once every 30 days to obtain a first raw material; the specific index of the element is that Zn is less than or equal to 1.3Kg/t.Fe; k 2 O+Na 2 O is less than 6.5kg/tFe; pb is less than 0.55kg/tFe, and the product can be used as the first raw material.
S3, putting the first raw material into a blast furnace for smelting; the step S3 comprises the steps of adjusting a slagging system and the distribution of coal gas flow; the slagging system comprises the following steps: so that the slag system component of the furnace slag reaches TiO 2 18% of MgO and 8.7% of slagThe magnesium to aluminum ratio of (1) was 0.62.
Example 2
When the vanadium-titanium-iron ore is smelted, harmful elements in a blast furnace are high, and in order to solve the problem, the method for adjusting the smelting specifically comprises the following steps: the method comprises the following steps:
s1, taking raw materials according to a preset proportion to obtain an initial material; the specific preset proportion is as follows: the initial material comprises 55% of magnesium-containing sinter, 40% of pellet and 10% of raw ore.
S2, performing element determination on the initial material according to the frequency of one time in 28 days to obtain a first raw material; the specific index of the element is that Zn is less than or equal to 1.3Kg/t.Fe; k is 2 O+Na 2 O is less than 6.5kg/tFe; pb is less than 0.55kg/tFe, and can be used as the first raw material.
S3, putting the first raw material into a blast furnace for smelting; the step S3 comprises the steps of adjusting a slagging system and the distribution of coal gas flow; the slagging system comprises the following steps: so that the slag system component of the furnace slag reaches TiO 2 16 percent of the slag, 8.1 percent of MgO and 0.6 percent of magnesium-aluminum ratio of the slag.
Example 3
When the vanadium-titanium-iron ore is smelted, harmful elements in a blast furnace are high, and in order to solve the problem, the method for adjusting the smelting specifically comprises the following steps: the method comprises the following steps:
s1, taking raw materials according to a preset proportion to obtain an initial material; the specific preset proportion is as follows: the initial material comprises 58% of magnesium-containing sinter, 45% of pellet and 15% of raw ore.
S2, performing element determination on the initial material according to the frequency of one time in 10 days to obtain a first raw material; the specific index of the element is that Zn is less than or equal to 1.3Kg/t.Fe; k is 2 O+Na 2 O is less than 6.5kg/tFe; pb is less than 0.55kg/tFe, and the product can be used as the first raw material.
S3, putting the first raw material into a blast furnace for smelting; the step S3 comprises the steps of adjusting a slagging system and the distribution of coal gas flow; the slagging system comprises the following steps: so that the slag system component of the furnace slag reaches TiO 2 19 percent of MgO, 8.8 percent of MgO and 0.65 percent of Mg/Al ratio of the slag.
Example 4
When the vanadium-titanium-iron ore is smelted, harmful elements in a blast furnace are high, and in order to solve the problem, the method for adjusting the smelting specifically comprises the following steps: the method comprises the following steps:
s1, taking raw materials according to a preset proportion to obtain an initial material; the specific preset proportion is as follows: the initial material comprises 55% of magnesium-containing sinter, 40% of pellet and 10% of raw ore.
S2, performing element determination on the initial material according to the frequency of once every 30 days to obtain a first raw material; the specific indexes of the elements are that Zn is less than or equal to 1.3Kg/t.Fe; k is 2 O+Na 2 O is less than 6.5kg/tFe; pb is less than 0.55kg/tFe, and can be used as the first raw material.
S3, putting the first raw material into a blast furnace for smelting; in the step S3, the slag-forming system is adjusted and the distribution of the coal gas flow is adjusted; the slagging system comprises the following steps: so that the slag system component of the furnace slag reaches TiO 2 The content of the slag is 18 percent, the content of MgO is 8.2 percent, and the magnesium-aluminum ratio of the slag is 0.62.
Example 5
When the vanadium-titanium-iron ore is smelted, harmful elements in a blast furnace are high, and in order to solve the problem, the method for adjusting the smelting specifically comprises the following steps: the method comprises the following steps:
s1, taking raw materials according to a preset proportion to obtain an initial material; the specific preset proportion is as follows: the initial material comprises 50% of magnesium-containing sinter, 38% of pellet and 5% of raw ore.
S2, performing element determination on the initial material according to the frequency of once every 10 days to obtain a first raw material; the specific indexes of the elements are that Zn is less than or equal to 1.3Kg/t.Fe; k 2 O+Na 2 O is less than 6.5kg/tFe; pb is less than 0.55kg/tFe, and the product can be used as the first raw material.
S3, putting the first raw material into a blast furnace for smelting; the step S3 comprises the steps of adjusting a slagging system and the distribution of coal gas flow; the slagging system comprises the following steps: so that the slag system component of the furnace slag reaches TiO 2 19 percent of MgO, 8.8 percent of MgO and 0.65 percent of Mg/Al ratio of the slag.
Comparative example 1
When the vanadium-titanium-iron ore is smelted, the conventional raw materials sold in the market are adopted, and the conventional smelting method is adopted for smelting.
Test examples
1.1 design of the experiment
After a period of time of smelting production, the blast furnace equipments of the smelting plants according to examples 1 to 3 and comparative example 1 were examined and evaluated for the inside of the hearth, the tuyere, the furnace shell and the piping, respectively, and the results of examination and evaluation are shown in Table 1.
TABLE 1 evaluation table for furnace hearth inside, tuyere, furnace shell and pipeline
1.2 analysis of results
As can be seen from table 1, a small amount of element-enriched blocks exist in the furnace hearth of the blast furnace equipment in examples 1 to 3, a large amount of element-enriched blocks exist at the furnace bottom of the blast furnace equipment in comparative example 1, besides, the tuyere of the blast furnace equipment in examples 1 to 3 has no obvious deformation, no obvious deformation and cracking of the furnace skin, and no large blockage phenomenon of the pipeline, while the tuyere of the comparative example has large upwarp deformation, cracks, cracking of the furnace skin, and damage of the cooling plate, and besides, the pipeline of the comparative example has blockage, so that the method can effectively reduce the introduction of harmful elements in the blast furnace, reduce the enrichment of the harmful elements in the equipment, reduce the negative effects of the harmful elements on the furnace skin and the cooling plate, and solve the problems of low production efficiency under the conditions of high zinc, high lead and high alkali, high production cost and high energy consumption of the existing coping mode; meanwhile, the method is simple and low in cost.
In conclusion, the blast furnace smelting method of the vanadium titano-magnetite suitable for the conditions of high zinc, high lead and high alkali, which is disclosed by the invention, effectively reduces the content of harmful elements in a finished product by carrying out element measurement on a preset material and reaching a preset value, and controls the content of the harmful elements in a raw material introduced into a blast furnace from the source; furthermore, the magnesium-containing sinter is introduced by adjusting the proportion of the preset raw materials, so that the MgO content in the slag is 8.1-8.8%, and the magnesium-aluminum ratio of the slag reaches 0.6-0.65, so that the slag has good flowThe slag has good alkali discharge capacity, so that the accumulation of harmful elements in the blast furnace is reduced; meanwhile, mgO can inhibit the activity of alkali metal, increase the content of MgO and reduce K in slag 2 O、Na 2 The activity of O reduces the circulating enrichment capacity of the accumulated alkali metal in the blast furnace and the erosion capacity of the furnace lining, thereby reducing the damage to blast furnace equipment.
The above embodiment is only one embodiment of the present invention, and the description thereof is 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 (8)
1. A blast furnace smelting method of vanadium titano-magnetite suitable for high zinc, high lead and high alkali conditions is characterized by comprising the following steps: s1, taking raw materials according to a preset proportion to obtain an initial material; s2, measuring elements of the initial material according to a preset time interval to obtain a first raw material; and S3, putting the first raw material into a blast furnace for smelting.
2. The blast furnace smelting method of vanadium titano-magnetite suitable for high zinc, high lead and high alkali condition according to claim 1, characterized in that: the initial material comprises 50-58% of magnesium-containing sinter, 38-45% of pellet and 5-15% of raw ore.
3. The blast furnace smelting method of vanadium titano-magnetite suitable for high-zinc, high-lead and high-alkali conditions according to claim 1, characterized in that: 2.8-3.2% of Mgo per part of the magnesium-containing sintered ore.
4. The blast furnace smelting method of vanadium titano-magnetite suitable for high zinc, high lead and high alkali condition according to claim 1, characterized in that: measurement of the elementThe specific indexes are that Zn is less than or equal to 1.3Kg/t.Fe; k 2 O+Na 2 O is less than 6.5kg/tFe; pb is less than 0.55kg/tFe, and can be used as the first raw material.
5. The blast furnace smelting method of vanadium titano-magnetite suitable for high-zinc, high-lead and high-alkali conditions according to claim 1, characterized in that: and S3, adjusting a slagging system and adjusting the distribution of coal gas flow.
6. The blast furnace smelting method of vanadium titano-magnetite suitable for high zinc, high lead and high alkali condition according to claim 5, characterized in that: the slagging system comprises the following steps: so that the contents of TiO2 and MgO in the slag system of the furnace slag are 16 to 19 percent and 8.1 to 8.8 percent respectively, and the magnesium-aluminum ratio of the furnace slag is 0.6 to 0.65.
7. The blast furnace smelting method of vanadium titano-magnetite suitable for high zinc, high lead and high alkali condition according to claim 5, characterized in that: the adjustment of the distribution of the coal gas flow is to arrange a coal gas flow in the center and at the edge of the blast furnace respectively.
8. The blast furnace smelting method of vanadium titano-magnetite suitable for high-zinc, high-lead and high-alkali conditions according to claim 5, characterized in that: and S3, adding one or a combination of a gravity dust removal device, a cyclone dust removal device or a cloth bag dust removal device.
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