CN115181851A - Method for preparing sintered ore from high-crystal-water iron ore powder - Google Patents
Method for preparing sintered ore from high-crystal-water iron ore powder Download PDFInfo
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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
- C22B1/16—Sintering; Agglomerating
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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
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
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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
- C22B1/242—Binding; Briquetting ; Granulating with binders
- C22B1/244—Binding; Briquetting ; Granulating with binders organic
- C22B1/245—Binding; Briquetting ; Granulating with binders organic with carbonaceous material for the production of coked agglomerates
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Abstract
A method for preparing sintered ore from high-crystal-water iron ore powder comprises the following steps: preparing a ball core by using high crystal water iron ore powder, fuel, additive and slaked lime added with desulfurized ash, preparing adhesive powder by using magnetite concentrate, fuel, additive and slaked lime, and pelletizing to prepare a lower-layer sintering material; preparing a spherical nucleus by using high-crystallization-water iron ore powder, fuel, an additive and slaked lime, preparing adhesive powder by using magnetite concentrate, the fuel, the additive and the slaked lime, and pelletizing to prepare an upper-layer sintering material; then distributing, igniting and sintering. In the invention, the lower-layer sintered material core is added with part of the desulfurized ash, so that the desulfurized ash can be recycled; the method has the advantages that the high-crystallization-water iron ore powder is used as a granulation core, the magnetite concentrate with weak assimilation property is used as adhesive powder to be prepared into quasi-particles for sintering, and the problem of air permeability deterioration caused by high-crystallization-water iron ore powder sintering and over-melting is solved; the sintering material is added with additives with strong oxidizing property and slaked lime in different proportions, so that the generation of calcium ferrite is promoted, and the thin-wall macroporous structure of the sintering ore is avoided.
Description
Technical Field
The invention belongs to the technical field of iron-making production, relates to a sintering production technology, and particularly relates to a method for preparing sintered ore from high-crystal-water iron ore powder.
Background
The high crystal water limonite powder exists as a dead ore for a long time, is not fully utilized, is well preserved, has large and concentrated reserves, thin covering layer, less harmful elements, lower mining cost, large, continuous and stable supply amount and lower price, but the sintering production is deteriorated due to the large proportion of high crystal water limonite powder.
During the sintering process, due to the high content of the limonite crystal water, a large amount of heat is consumed for decomposition and migration in materials, so that the sintering temperature in a material layer is reduced, the sintering time is reduced, and the productivity is reduced. Because the assimilation temperature of the limonite is low, the limonite is easy to be excessively melted at high temperature, so that the air permeability of a material layer is reduced, and the productivity is reduced. Because the porosity of the limonite is high, more water needs to be added in the sintering process to normally sinter and produce the limonite, so that the fuel consumption is increased, the raw material filling density in the sintering trolley is reduced, and the shrinkage rate in the sintering process is increased. The above problems result in the reduction of the sintering productivity of limonite and the deterioration of the quality of sintered ore, so that the blending ratio of limonite in the sintering production is about 30 percent, and the limonite is difficult to be applied in large quantity.
In the sintering production of high crystal water limonite, in order to improve the productivity and sintering index of limonite, the prior main method comprises the following steps: 1. adding larger water amount; 2. sintering with high alkalinity and high carbon content; 3. pressing or increasing the thickness of the material layer. The sintering rate can be improved to a certain extent by adding larger water quantity, but the combustion consumption is increased along with the increase of the water quantity, the combustion speed is increased, the ore return quantity is increased, and the productivity is reduced; china mainly uses high-alkalinity sinter ore, and excessive increase of carbon blending amount can cause excessive melting of a material layer and poor air permeability; pressing is an effective method for improving the limonite sintering productivity, but the pressing degree is limited, and if the pressing degree is too large, the air permeability of a material layer is deteriorated, and the productivity is reduced; increasing the thickness of the material bed is also a method for improving the productivity, but the increase of the thickness of the sinter bed is limited even when the specifications of the sintering machine are fixed at present.
Patent document 201210455905.7 proposes an iron ore sintering method with added limonite, which comprises limonite fine grinding treatment, limonite baking treatment, blending, mixing, material distribution, material pressing and ignition sintering, wherein the particle size of the limonite after fine grinding is controlled to be less than 1mm, the limonite after fine grinding is baked at 180-220 ℃, the water content in the mixed material obtained by mixing is controlled to be 7.3% -7.6%, and the material pressing amount in the material pressing step is controlled to be 20-50 mm. The invention can eliminate the burst phenomenon of coarse-grain limonite in the sintering process, but does not solve the problems of reduced air permeability of a material layer and reduced productivity caused by the excessive melting of the limonite at high temperature, and does not solve the problem of lower strength of sintered ore produced by the limonite.
Patent document 201210302330.7 proposes a sintering method of high-proportion limonite, which is characterized in that the ingredients used for sintering are a mixture composed of five components of iron material, fuel, flux and return mine, all the components are mixed, water is added into a cylindrical mixer for uniform mixing and pelletizing, and the uniform mixing and pelletizing time is controlled to be 5-7 minutes; loading the prepared mixture into a sintering trolley through a distributor for sintering, sintering under the conditions that the sintering ignition temperature is 1200 +/-50 ℃, the sintering trolley speed is 1.3-1.6 m/min and the sintering end point temperature is 300 +/-10 ℃, crushing, cooling and screening the sintering ore, and adding CaCl with the mass concentration of 2% according to 2.0% of the weight of the sintering ore on a screen 2 The solution is sprayed onto the sinter on the screen. The invention increases the ignition temperature by prolonging the mixing time and the sintering timeThe quality of the sintered ore is improved, but the sintering characteristic of the limonite is not considered, so the limonite proportion is not high by the method, and the strength of the produced sintered ore is lower.
Patent document 202010012300.7 discloses a method for improving the quality of sinter in the sintering production of a large proportion of limonite, which comprises the following steps: step 1, blending, wherein the ratio of limonite is 60-80 wt%, the ratio of fine-grained high-quality magnetite concentrate is not less than 20wt%, and the following constraints are applied to the components of the sinter during blending: the alkalinity of the sinter is 2.20 to 2.60, and the SiO content of the sinter is 2 /Al 2 O 3 The ratio is 3.0-4.0, the MgO content is 1.5-2.5 wt%; and 2, blending after mixing and stacking, adding 4.5-5.0 wt% of coke powder, 4.0-6.0 wt% of quicklime, 4-7 wt% of limestone and 0.028-0.035 wt% of SYP synergist into the mixed ore, and mixing uniformly. The invention improves the sintering quality by adopting measures of high alkalinity, low MgO sintering, ignition temperature improvement and the like, solves the problem that the prior sintering technology can not adapt to the limonite sintering with the proportion relation of more than 40wt%, but does not solve the problems of poor sintering strength and low productivity of the high crystal water limonite.
Disclosure of Invention
The invention provides a method for preparing sintered ore from high-crystal-water iron ore powder, which takes the high-crystal-water iron ore powder as a granulation core, magnetite concentrate as adhesive powder, slaked lime mixed with desulfurized ash as a binder, and an oxidizing sintering aid is added to prepare a sintering material by pelletizing, so that the high-crystal-water iron ore is inhibited from being sintered and over-melted, the generation of calcium ferrite of the sintered ore is promoted, and the aims of improving the metallurgical property of the sintered ore produced from a large proportion of limonite and recycling the desulfurized ash are fulfilled.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for preparing sintered ore from high-crystallization-water iron ore powder comprises the following steps:
1) Preparing a lower-layer sintering material: the high crystal water iron ore powder, fuel and additive form a mixture A 1 Wherein the mass percent of the high crystal water iron ore powder is 91-94%, the mass percent of the fuel is 3-5%, and the mass percent of the additive is 3-4%;to the mixture A 1 Adding a mixture of slaked lime and desulfurized fly ash to form a mixture A, and adjusting the addition amount of the mixture of slaked lime and desulfurized fly ash to ensure that the alkalinity of the mixture A is 2.1-2.3; adding water into the mixture A, uniformly mixing, and then preparing a ball core A with the granularity of 4 +/-0.5 mm;
mixture B consisting of magnetite concentrate, fuel and additive 1 Wherein the mass percent of the magnetite concentrate is 91-94%, the mass percent of the fuel is 4-6%, and the mass percent of the additive is 2-3%; to the mixture B 1 Adding slaked lime to form a mixture B, adjusting the addition amount of the slaked lime to ensure that the alkalinity of the mixture B is 1.8-2.0, and adding water into the mixture B for uniformly mixing;
pelletizing by taking the ball core A as a pelletizing core and taking the mixture B as adhesive powder to prepare a lower-layer sintering material; wherein the mass ratio of the mixture A to the mixture B is 2-4;
2) Preparing an upper-layer sintering material: the high crystal water iron ore powder, the fuel and the additive form a mixture C 1 Wherein the mass percent of the high crystal water iron ore powder is 91-94%, the mass percent of the fuel is 4-6%, and the mass percent of the additive is 2-3%; to the mixture C 1 Adding slaked lime to form a mixture C, and adjusting the addition amount of the slaked lime to ensure that the alkalinity of the mixture C is 2.3-2.5; adding water into the mixture C, uniformly mixing, and then preparing a ball core C with the granularity of 4 +/-0.5 mm;
mixture D consisting of magnetite concentrate, fuel and additive 1 Wherein the mass fraction of the magnetite concentrate is 92-95%, the mass fraction of the fuel is 4-6%, and the mass fraction of the additive is 1-2%; to the mixture D 1 Adding slaked lime to form a mixture D, adjusting the addition amount of the slaked lime to ensure that the alkalinity of the mixture D is 1.6-1.8, and adding water into the mixture D for uniformly mixing;
pelletizing by using the ball core C as a pelletizing core and using the mixture D as adhesive powder to prepare an upper-layer sintering material; wherein the mass ratio of the mixture C to the mixture D is 1-3;
3) The lower layer of sintering material is firstly distributed and added on a sintering trolley, and the thickness of the distributed material is 650-700 mm; air draft is carried out for material pressing, and the negative pressure of the air draft is 14-20 kpa; after the material layer shrinks, continuously adding the upper-layer sintering material cloth onto the lower-layer sintering material, wherein the thickness of the cloth is 300-350 mm; igniting and exhausting air to sinter.
The high crystal water iron ore powder has the granularity of less than 100 meshes and 40-55 percent, and the granularity of more than 1mm is not more than 35 percent; the mass fraction of crystal water is less than 10 percent.
The granularity of the magnetite concentrate is less than 200 meshes and is more than 90 percent, and the assimilation temperature of the magnetite concentrate is 1260-1280 ℃.
The additive is one or the mixture of two of strong oxidizing substance calcium permanganate and calcium ferrate.
The fuel is one or the mixture of two of coke powder, anthracite, petroleum coke and biomass carbon powder.
The mass ratio of the slaked lime to the desulfurized ash is 2-4; the desulfurization ash is solid waste generated by sintering flue gas dry desulfurization or semi-dry desulfurization.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention takes the high crystal water iron ore powder as the core of granulation and the magnetite concentrate with high assimilation temperature as the adhesive powder to prepare the quasi-particle for sintering, solves the problems of loose and porous high crystal water ore powder, strong assimilation and easy self-melting, avoids the occurrence of a thin-wall macroporous structure of the sintering ore and improves the metallurgical performance of the sintering ore.
2. According to the invention, the strong oxidizing additives and the slaked lime in different proportions are respectively added into the granulation core high-crystalline water powder ore and the adhered powder magnetite concentrate to form sintering quasi-particles with the oxidizing property and the alkalinity gradually reduced from inside to outside, so that the generation of calcium ferrite can be promoted, the problem of air permeability deterioration of a limonite sintering melting zone is solved, the sintering utilization coefficient is improved, and the sintering solid fuel consumption is reduced.
3. According to the invention, part of the desulfurization ash is added into the lower-layer sintering material core, so that the cyclic utilization of the desulfurization ash can be realized, and the environmental pollution caused by the accumulation of the desulfurization ash is reduced.
Detailed Description
The present invention is described in more detail below by way of examples, which are merely illustrative of the best mode of carrying out the invention and do not limit the scope of the invention in any way.
Example 1:
a method for preparing sintered ore from high-crystal-water iron ore powder includes such steps as mixing high-crystal-water iron ore powder with fuel and additive 1 Wherein the mass percent of the high crystal water iron ore powder is 91%, the mass percent of the fuel is 5%, and the mass percent of the additive is 4%. To the mixture A 1 Adding a mixture of slaked lime and desulfurized fly ash to form a mixture A; the addition amount of the mixture of the slaked lime and the desulfurized fly ash is adjusted to ensure that the alkalinity of the mixture A is 2.3. And adding water into the mixture A, uniformly mixing, and then preparing the ball core A with the granularity of 4 +/-0.5 mm. Mixture B composed of magnetite concentrate, fuel and additive 1 Wherein the mass percent of the magnetite concentrate is 93 percent, the mass percent of the fuel is 5 percent, and the mass percent of the additive is 2 percent; to the mixture B 1 Adding slaked lime to form a mixture B, adjusting the adding amount of the slaked lime to ensure that the alkalinity of the mixture B is 1.8, and adding water into the mixture B for uniformly mixing. And pelletizing by taking the ball core A as a pelletizing core and taking the mixture B as adhesive powder to prepare the lower-layer sintering material. The high crystal water iron ore powder used by the lower layer sintering material has the granularity of 55 percent when being smaller than 100 meshes, 30 percent when being larger than 1mm and 8 percent of crystal water mass fraction; the magnetite concentrate is high assimilation temperature iron ore, the granularity of the magnetite concentrate is less than 200 meshes and 94 percent, and the assimilation temperature is 1280 ℃; the additive is the mixture of calcium permanganate and calcium ferrate, and the fuel is coke powder; in the mixture of the slaked lime and the desulfurized fly ash, the mass ratio of the slaked lime to the desulfurized fly ash is 3; the desulfurized ash is solid waste generated by dry desulfurization or semi-dry desulfurization of the sintering flue gas. The mass ratio of the mixture A to the mixture B is 3.
The high crystal water iron ore powder, the fuel and the additive form a mixture C 1 Wherein the mass percent of the high crystal water iron ore powder is 93 percent, the mass percent of the fuel is 4.5 percent, and the mass percent of the additive is 2.5 percent; to the mixture C 1 Adding slaked lime to form a mixture C, and adjusting the addition amount of the slaked lime to ensure that the alkalinity of the mixture C is 2.4; and adding water into the mixture C, uniformly mixing, and then preparing the spherical core C with the granularity of 4 +/-0.5 mm. Mixture D consisting of magnetite concentrate, fuel and additive 1 Wherein the mass percent of the magnetite concentrate is 93.5 percent, and the magnetite concentrate is combustedThe mass fraction of the material is 5 percent, and the mass fraction of the additive is 1.5 percent; to the mixture D 1 Adding slaked lime to form a mixture D, adjusting the adding amount of the slaked lime to ensure that the alkalinity of the mixture D is 1.7, and adding water into the mixture D for uniformly mixing. And (4) pelletizing the pellets C and the mixture D to obtain the upper-layer sintering material. The granularity of the high crystal water iron ore powder used by the upper-layer sintering material is 45 percent with the granularity less than 100 meshes, 20 percent with the granularity more than 1mm, and the mass fraction of the crystal water is 7 percent; the magnetite concentrate is iron ore with high assimilation temperature, the granularity of the iron ore is 91 percent with less than 200 meshes, and the assimilation temperature is 1270 ℃; the additive is calcium ferrate, and the fuel is the mixture of coke powder and biomass carbon powder; the mass ratio of the mixture C to the mixture D is 3.
The lower layer of sintering material is firstly distributed and added on a sintering trolley, and the thickness of the distributed material is 700mm; air draft is carried out for material pressing, and the air draft negative pressure is 16kpa; after the material layer shrinks, continuously adding the upper-layer sintering material cloth to the lower-layer sintering material, wherein the thickness of the cloth is 350mm; igniting and exhausting air to sinter.
After the invention is applied, compared with the traditional sintering of the high crystal water iron ore powder, the proportion of the high crystal water iron ore powder is improved from 35 percent to 70 percent, and the sintering utilization coefficient is 1.354t/m 2 H is increased to 1.565t/m 2 H, the burning rate of the sintering solid is reduced from 47kg/t to 41kg/t, and the drum strength of the sintering ore is improved from 79.4 percent to 85.6 percent.
Example 2:
a process for preparing sintered ore from high-crystalline-water iron ore powder includes such steps as mixing A with fuel and additive 1 Wherein the mass percentage of the high crystal water iron ore powder is 93 percent, the mass percentage of the fuel is 4 percent, and the mass percentage of the additive is 3 percent. To the mixture A 1 Adding a mixture of slaked lime and desulfurized fly ash to form a mixture A; the addition amount of the mixture of the slaked lime and the desulfurized fly ash is adjusted to make the alkalinity of the mixture A be 2.1. And adding water into the mixture A, uniformly mixing, and then preparing the ball core A with the granularity of 4 +/-0.5 mm. Mixture B composed of magnetite concentrate, fuel and additive 1 Wherein the mass percent of the magnetite concentrate is 92.5%, the mass percent of the fuel is 4.5%, and the mass percent of the additive is 3%; to the mixture B 1 Adding slaked lime to form mixture B, and regulating slaked lime additionAdding the mixture B until the alkalinity of the mixture B is 1.9, and adding water into the mixture B for uniformly mixing. And pelletizing by using the ball core A as a pelletizing core and the mixture B as adhesive powder to prepare the lower-layer sintering material. The granularity of the high crystal water iron ore powder used by the lower-layer sintering material is 50 percent smaller than 100 meshes, 25 percent larger than 1mm, and the mass fraction of the crystal water is 9 percent; the magnetite concentrate is iron ore with high assimilation temperature, the granularity of the iron ore is 92 percent with the granularity of less than 200 meshes, and the assimilation temperature is 1275 ℃; the additive is calcium ferrate; the fuel is the mixture of coke powder and anthracite; in the mixture of the slaked lime and the desulfurized fly ash, the mass ratio of the slaked lime to the desulfurized fly ash is 4; the desulfurized ash is solid waste generated by dry desulfurization or semi-dry desulfurization of the sintering flue gas. The mass ratio of the mixture A to the mixture B is 3.5.
The high crystal water iron ore powder, the fuel and the additive form a mixture C 1 Wherein the mass percent of the high crystal water iron ore powder is 92 percent, the mass percent of the fuel is 5 percent, and the mass percent of the additive is 3 percent; to the mixture C 1 Adding slaked lime to form a mixture C, and adjusting the addition amount of the slaked lime to ensure that the alkalinity of the mixture C is 2.3; and adding water into the mixture C, uniformly mixing, and then preparing the spherical core C with the granularity of 4 +/-0.5 mm. Mixture D consisting of magnetite concentrate, fuel and additive 1 Wherein the mass percent of the magnetite concentrate is 93 percent, the mass percent of the fuel is 5 percent, and the mass percent of the additive is 2 percent; to the mixture D 1 Adding slaked lime to form a mixture D, adjusting the adding amount of the slaked lime to ensure that the alkalinity of the mixture D is 1.8, and adding water into the mixture D for uniformly mixing. And (4) pelletizing the pellets C and the mixture D to obtain the upper-layer sintering material. The granularity of the high crystal water iron ore powder used by the upper layer sintering material is 40 percent with the granularity less than 100 meshes, 30 percent with the granularity more than 1mm, and the mass fraction of the crystal water is 9 percent; the magnetite concentrate is high assimilation temperature iron ore, the granularity of the iron ore is less than 200 meshes and 94 percent, and the assimilation temperature is 1265 ℃; the additive is calcium permanganate, and the fuel is the mixture of coke powder and biomass carbon powder; the mass ratio of the mixture C to the mixture D is 2.5.
The lower layer of sintering material is firstly distributed and added on a sintering trolley, and the thickness of the distributed material is 650mm; air draft is carried out for pressing materials, and the air draft negative pressure is 18 kilopascals; after the material layer shrinks, continuously adding the upper-layer sintering material cloth to the lower-layer sintering material, wherein the thickness of the cloth is 350mm; igniting and exhausting air to sinter.
After the invention is applied, compared with the traditional sintering of the high crystal water iron ore powder, the proportion of the high crystal water iron ore powder is improved from 35 percent to 75 percent, and the sintering utilization coefficient is 1.376t/m 2 H is increased to 1.564t/m 2 H, the burning rate of the sintering solid is reduced from 46.5kg/t to 40kg/t, and the drum strength of the sintering ore is improved from 80.2 percent to 86 percent.
Claims (6)
1. A method for preparing sintered ore from high-crystal-water iron ore powder is characterized by comprising the following steps:
1) Preparing a lower-layer sintering material: the high crystal water iron ore powder, fuel and additive form a mixture A 1 Wherein the weight percentage of the high crystal water iron ore powder is 91-94 percent, the weight percentage of the fuel is 3-5 percent, and the weight percentage of the additive is 3-4 percent; to the mixture A 1 Adding a mixture of slaked lime and desulfurized fly ash to form a mixture A, and adjusting the addition amount of the mixture of slaked lime and desulfurized fly ash to ensure that the alkalinity of the mixture A is 2.1-2.3; adding water into the mixture A, uniformly mixing, and then preparing a ball core A with the granularity of 4 +/-0.5 mm;
mixture B composed of magnetite concentrate, fuel and additive 1 Wherein the mass percent of the magnetite concentrate is 91-94%, the mass percent of the fuel is 4-6%, and the mass percent of the additive is 2-3%; to the mixture B 1 Adding slaked lime to form a mixture B, adjusting the addition amount of the slaked lime to ensure that the alkalinity of the mixture B is 1.8-2.0, and adding water into the mixture B for uniformly mixing;
pelletizing by taking the ball core A as a pelletizing core and taking the mixture B as adhesive powder to prepare a lower-layer sintering material; wherein the mass ratio of the mixture A to the mixture B is 2-4;
2) Preparing an upper-layer sintering material: the high crystal water iron ore powder, the fuel and the additive form a mixture C 1 Wherein the mass percent of the high crystal water iron ore powder is 91-94%, the mass percent of the fuel is 4-6%, and the mass percent of the additive is 2-3%; to the mixture C 1 Adding slaked lime to form a mixture C, and adjusting the addition amount of the slaked lime to ensure that the alkalinity of the mixture C is 2.3-2.5; adding water into the mixture C and uniformly mixing,then preparing a spherical core C with the granularity of 4 +/-0.5 mm;
mixture D consisting of magnetite concentrate, fuel and additive 1 Wherein the mass fraction of the magnetite concentrate is 92-95%, the mass fraction of the fuel is 4-6%, and the mass fraction of the additive is 1-2%; to the mixture D 1 Adding slaked lime to form a mixture D, adjusting the addition amount of the slaked lime to ensure that the alkalinity of the mixture D is 1.6-1.8, and adding water into the mixture D for uniformly mixing;
pelletizing by using the ball core C as a pelletizing core and using the mixture D as adhesive powder to prepare an upper-layer sintering material; wherein the mass ratio of the mixture C to the mixture D is 1-3;
3) The lower layer of sintering material is firstly distributed and added on a sintering trolley, and the thickness of the distributed material is 650-700 mm; air draft is carried out for material pressing, and the negative pressure of the air draft is 14-20 kpa; after the material layer shrinks, continuously adding the upper-layer sintering material cloth onto the lower-layer sintering material, wherein the thickness of the cloth is 300-350 mm; igniting and exhausting air to sinter.
2. The method for preparing sintered ore from iron ore powder with high crystal water content according to claim 1, wherein the iron ore powder with high crystal water content has a particle size of less than 100 meshes of 40-55%, and a particle size of more than 1mm of not more than 35%; the mass fraction of crystal water is less than 10 percent.
3. The method for preparing sintered ore from iron ore powder with high crystal water content according to claim 1, wherein the magnetite concentrate has a particle size of less than 200 mesh and greater than 90%, and an assimilation temperature of 1260 ℃ to 1285 ℃.
4. The method for preparing sintered ore from high crystal water iron ore powder as claimed in claim 1, wherein the additive is one or a mixture of two of calcium permanganate and calcium ferrate.
5. The method for preparing sintered ore from high crystal water iron ore powder according to claim 1, wherein the fuel is one or a mixture of two of coke powder, anthracite, petroleum coke and biomass carbon powder.
6. The method for preparing the sintered ore from the high-crystal-water iron ore powder as claimed in claim 1, wherein the mass ratio of the mixture of the hydrated lime and the desulfurized ash is 2-4; the desulfurization ash is solid waste generated by sintering flue gas dry desulfurization or semi-dry desulfurization.
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