CN108754132B - Method for improving performance of sintered ore metallurgy - Google Patents
Method for improving performance of sintered ore metallurgy Download PDFInfo
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- CN108754132B CN108754132B CN201810610888.9A CN201810610888A CN108754132B CN 108754132 B CN108754132 B CN 108754132B CN 201810610888 A CN201810610888 A CN 201810610888A CN 108754132 B CN108754132 B CN 108754132B
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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
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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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Abstract
The invention relates to a method for improving the performance of sintered ore metallurgy, wherein sintering raw materials and fuel are subjected to primary mixing and secondary mixing granulation to form a sintering mixture, and calcium chlorate is respectively added to the sintering mixture during primary mixing and secondary mixing granulation to obtain a sintering mixture A, a sintering mixture B and a sintering mixture C; the calcium chlorate is added in the form of a saturated solution. The sintering mixture A is used as a bottom layer sintering material, the sintering mixture B is used as a middle layer sintering material, the sintering mixture C is used as an upper layer sintering material, and after all three sintering mixtures are completely added, ignition air draft is carried out for sintering to obtain a finished product sintering ore; according to the invention, calcium chlorate is added into the sintering mixture, and the calcium chlorate is heated and decomposed to release oxygen, so that the oxygen content in a sintering material layer can be increased, the proportion of calcium ferrite in the sintering ore is increased, and the reducibility and the soft-melting drippability of the sintering ore are improved; meanwhile, calcium chloride is formed and evenly attached to the sinter, so that the low-temperature reduction powdering property of the sinter is improved.
Description
Technical Field
The invention relates to the technical field of sintering, in particular to a method for improving the performance of sintered ore metallurgy.
Background
The sintering production process is that the sintering mixture is added on a sintering trolley, and is ignited by air draft, sintering is carried out from the surface to the inside from top to bottom, violent gas-solid-liquid multiphase reaction occurs in the sintering process, and finally, the sintering ore with different structural characteristics is formed by cooling and condensation after liquid-phase assimilation, bonding phase formation, mineral crystallization and recrystallization and phase change and crystal form transformation. The amount of oxygen pumped from top to bottom directly affects the vertical sintering speed, and further affects the operation speed of the sintering machine, the quality of sintered ore and the production efficiency.
The metallurgical properties of the sintered ore include reducibility at 900 ℃, reduction degradation at 500 ℃, refractoriness under load and melting and dropping properties. Reducibility is the basic performance of the sinter, and not only directly influences the utilization rate and fuel ratio of coal gas, but also influences the reduction strength and reflow performance of the sinter; the low-temperature reduction degradation performance refers to the degradation degree of the sinter produced by reduction at the low temperature of 400-600 ℃ after the sinter is loaded into a blast furnace. . The reducibility and low-temperature reduction degradation rate of the sinter are related to the mineral composition and the mineral phase structure formed in the sintering process, and the calcium ferrite is used as a bonding phase of the high-alkalinity sinter and is a link between iron oxide and an unmelted part, so that the strength and reducibility of the sinter are determined to a great extent. The high alkalinity sintering mixture and the strong oxidizing atmosphere in the sintering process are beneficial to the generation of the multi-element needle-shaped calcium ferrite. Under the condition of fixed alkalinity of the sinter, the oxygen content of the sinter layer, namely the atmosphere in the sintering process directly influences the content of calcium ferrite in the sinter.
The high temperatures and combustion products obtained from the combustion of solid fuels during sintering provide the necessary heat and atmospheric conditions for the formation of the liquid phase and for the performance of all physicochemical reactions. Under the condition of high oxygen level, the heat and mass transfer condition among gas phase, solid phase and liquid phase is good, which is beneficial to the generation of liquid phase, so that the reaction is more complete, and simultaneously, the burning condition of coke powder can be improved, the effect of fully oxidizing the low-valence iron oxide is achieved, and the necessary condition is ensured for the generation of more calcium ferrite, therefore, the oxidizing atmosphere of the material layer is improved to improve the high-temperature metallurgical performance of the sinter in terms of the uniform distribution of the granularity of the sinter and the optimization of the chemical composition of the sinter.
The traditional oxygen-enriched sintering comprises ignition oxygen enrichment and heat preservation oxygen enrichment, wherein the ignition oxygen enrichment is that oxygen produced by an oxygen production system is sent to a combustion-supporting pipeline through a booster pump, a conveying pipeline, a flow divider valve and a pressure reducing valve, and the oxygen in the combustion-supporting pipeline is mixed with combustion-supporting air to form required oxygen-enriched combustion-supporting gas; the oxygen-enriched combustion-supporting gas is mixed with the coke oven gas and then ignited. The heat preservation and oxygen enrichment is to add oxygen produced by the adsorption oxygen production system into the heat preservation section through the oxygen supply device and around the heat preservation cover, so that the oxygen content in the heat preservation atmosphere after the oxygen is added reaches 22% -30%, and supply oxygen enrichment into the sintering material layer through strong air draft. After the sintering mixture is ignited at high temperature, the charge level is rapidly melted, crusted and hardened, which causes that oxygen in the traditional oxygen-enriched sintering is difficult to be pumped into a sintering charge layer, reduces the amount of oxygen pumped from top to bottom and reduces the effect of the traditional oxygen-enriched sintering.
In order to improve the low-temperature reduction pulverization of the sinter, the traditional method is to spray a halide solution mainly containing calcium chloride on the surface of the sinter, and the spray mode is to directly spray the sinter by adopting a spray pipe before the sinter enters a blast furnace. The sprayed sintering ore is directly sent into a blast furnace for ironmaking, so that the halide solution is extremely non-uniform in adhesion on the sintering ore, and the low-temperature reduction degradation performance of the subsequent sintering ore is influenced.
The invention provides a method for improving metallurgical performance of a sinter, aiming at improving the metallurgical performance of the sinter, overcoming the defects of the traditional oxygen-enriched sintering method and the existing method for spraying calcium chloride to the sinter and improving the metallurgical performance of the sinter.
Disclosure of Invention
The invention provides a method for improving metallurgical performance of sinter, which is characterized in that calcium chlorate is added into a sinter mixture, the calcium chlorate is heated and decomposed to release oxygen, the oxygen content in a sinter layer can be increased, the proportion of calcium ferrite in the sinter is increased, and the reducibility and the reflow drippability of the sinter are improved; meanwhile, calcium chloride is formed and evenly attached to the sinter, so that the low-temperature reduction powdering property of the sinter is improved.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for improving the performance of sinter metallurgy comprises distributing sinter mixture into three layers, and adding calcium chlorate into the upper layer sinter mixture, the middle layer sinter mixture and the lower layer sinter mixture; the method comprises the following specific steps:
(1) the sintering raw materials and the fuel are subjected to primary mixing and secondary mixing granulation to form a sintering mixture, calcium chlorate accounting for 6-7.5% of the total mass of the sintering mixture is added during the primary mixing and the secondary mixing granulation to obtain a sintering mixture A, 60-65% of the added calcium chlorate is added during the primary mixing, and the rest 35-40% of the calcium chlorate is added during the secondary mixing granulation; the calcium chlorate is added in the form of saturated solution;
(2) the sintering raw materials and the fuel are subjected to primary mixing and secondary mixing granulation to form a sintering mixture, calcium chlorate accounting for 4.5-6% of the total mass of the sintering mixture is added during the primary mixing and the secondary mixing granulation to obtain a sintering mixture B, 65-70% of the added calcium chlorate is added during the primary mixing, and the rest 30-35% of the calcium chlorate is added during the secondary mixing granulation; the calcium chlorate is added in the form of saturated solution;
(3) the sintering raw material and the fuel are subjected to primary mixing and secondary mixing granulation to form a sintering mixture, calcium chlorate accounting for 3.5-5% of the total mass of the sintering mixture is added during the primary mixing and the secondary mixing granulation to obtain a sintering mixture C, 70-75% of the added calcium chlorate is added during the primary mixing, and the rest 25-30% of the calcium chlorate is added during the secondary mixing granulation; the calcium chlorate is added in the form of saturated solution;
(4) firstly, adding a sintering mixture A cloth on a sintering trolley as a bottom layer sintering material, wherein the cloth thickness is 200-250 mm; then adding the sintering mixture B cloth to the bottom layer sintering material to be used as a middle layer sintering material, wherein the cloth thickness is 400-500 mm; finally, adding the sintering mixture C cloth on the middle-layer sintering material to serve as an upper-layer sintering material, wherein the cloth thickness is 300-350 mm;
(5) after all three sintering mixtures are added, igniting and exhausting air for sintering to obtain a finished sintering ore; the ignition temperature is 950-1050 ℃, and the negative pressure of air draft is 14000-18000 Pa.
The alkalinity of the sintering mixture A, the alkalinity of the sintering mixture B and the alkalinity of the sintering mixture C are the same, and the alkalinity is 1.8-2.2.
In the grain size composition of the sintering mixture A, the grain size of not less than 3mm and not more than 5mm accounts for 35-40% of the total mass percentage; the granularity of more than 5mm and less than or equal to 8mm accounts for 35 to 40 percent of the total mass percentage; the moisture of the sintering mixture A is controlled to be 6.5-7%.
In the grain size composition of the sintering mixture B, the grain size of not less than 3mm and not more than 5mm accounts for 40-45% of the mass percentage; the granularity of more than 5mm and less than or equal to 8mm accounts for 30 to 35 percent of the mass percent; the moisture of the sintering mixture B is controlled to be 7-7.5%.
In the grain size composition of the sintering mixture C, the grain size of not less than 3mm and not more than 5mm accounts for 45-50% of the mass percentage; the granularity is more than 5mm and less than or equal to 8mm, and accounts for 25 to 30 percent of the mass percent; the moisture of the sintering mixture B is controlled to be 7.5-8%.
Compared with the prior art, the invention has the beneficial effects that:
1) according to the invention, calcium chlorate is added into the sintering mixture, so that the oxygen content in the sintering material layer can be increased, the proportion of calcium ferrite in the sintering ore is increased, and the reducibility and the soft-melting dripping property of the sintering ore are improved;
2) according to the invention, calcium chlorate is added into the sintering mixture, the calcium chlorate is heated and decomposed to release oxygen, and simultaneously calcium chloride is formed to be uniformly attached to the sintering ore, so that the low-temperature reduction powdering property of the sintering ore is improved.
Detailed Description
The invention relates to a method for improving the performance of sintered ore metallurgy, wherein a sintering mixture is distributed in three layers, and calcium chlorate is respectively added into an upper layer sintering mixture, a middle layer sintering mixture and a lower layer sintering mixture; the method comprises the following specific steps:
(1) the sintering raw materials and the fuel are subjected to primary mixing and secondary mixing granulation to form a sintering mixture, calcium chlorate accounting for 6-7.5% of the total mass of the sintering mixture is added during the primary mixing and the secondary mixing granulation to obtain a sintering mixture A, 60-65% of the added calcium chlorate is added during the primary mixing, and the rest 35-40% of the calcium chlorate is added during the secondary mixing granulation; the calcium chlorate is added in the form of saturated solution;
(2) the sintering raw materials and the fuel are subjected to primary mixing and secondary mixing granulation to form a sintering mixture, calcium chlorate accounting for 4.5-6% of the total mass of the sintering mixture is added during the primary mixing and the secondary mixing granulation to obtain a sintering mixture B, 65-70% of the added calcium chlorate is added during the primary mixing, and the rest 30-35% of the calcium chlorate is added during the secondary mixing granulation; the calcium chlorate is added in the form of saturated solution;
(3) the sintering raw material and the fuel are subjected to primary mixing and secondary mixing granulation to form a sintering mixture, calcium chlorate accounting for 3.5-5% of the total mass of the sintering mixture is added during the primary mixing and the secondary mixing granulation to obtain a sintering mixture C, 70-75% of the added calcium chlorate is added during the primary mixing, and the rest 25-30% of the calcium chlorate is added during the secondary mixing granulation; the calcium chlorate is added in the form of saturated solution;
(4) firstly, adding a sintering mixture A cloth on a sintering trolley as a bottom layer sintering material, wherein the cloth thickness is 200-250 mm; then adding the sintering mixture B cloth to the bottom layer sintering material to be used as a middle layer sintering material, wherein the cloth thickness is 400-500 mm; finally, adding the sintering mixture C cloth on the middle-layer sintering material to serve as an upper-layer sintering material, wherein the cloth thickness is 300-350 mm;
(5) after all three sintering mixtures are added, igniting and exhausting air for sintering to obtain a finished sintering ore; the ignition temperature is 950-1050 ℃, and the negative pressure of air draft is 14000-18000 Pa.
The alkalinity of the sintering mixture A, the alkalinity of the sintering mixture B and the alkalinity of the sintering mixture C are the same, and the alkalinity is 1.8-2.2.
In the grain size composition of the sintering mixture A, the grain size of not less than 3mm and not more than 5mm accounts for 35-40% of the total mass percentage; the granularity of more than 5mm and less than or equal to 8mm accounts for 35 to 40 percent of the total mass percentage; the moisture of the sintering mixture A is controlled to be 6.5-7%.
In the grain size composition of the sintering mixture B, the grain size of not less than 3mm and not more than 5mm accounts for 40-45% of the mass percentage; the granularity of more than 5mm and less than or equal to 8mm accounts for 30 to 35 percent of the mass percent; the moisture of the sintering mixture B is controlled to be 7-7.5%.
In the grain size composition of the sintering mixture C, the grain size of not less than 3mm and not more than 5mm accounts for 45-50% of the mass percentage; the granularity is more than 5mm and less than or equal to 8mm, and accounts for 25 to 30 percent of the mass percent; the moisture of the sintering mixture B is controlled to be 7.5-8%.
The following examples are carried out on the premise of the technical scheme of the invention, and detailed embodiments and specific operation processes are given, but the scope of the invention is not limited to the following examples.
[ example 1 ]
The sintering raw material and the fuel are subjected to primary mixing and secondary mixing granulation to form a sintering mixture, calcium chlorate accounting for 6.5 percent of the total mass of the sintering mixture is added during the primary mixing and the secondary mixing granulation to obtain a sintering mixture A, 60 percent of the added calcium chlorate is added during the primary mixing, and the rest 40 percent of the calcium chlorate is added during the secondary mixing granulation. The calcium chlorate is added in the form of a saturated solution.
In the grain size composition of the sintering mixture A, the grain size of 3mm or more and 5mm or less accounts for 37 percent of the total mass percent; the particle size is more than 5mm and less than or equal to 8mm, and accounts for 38 percent of the total mass percent; the moisture content of the sintering mixture A is controlled at 6.5%, and the alkalinity is controlled at 1.9.
The sintering raw material and the fuel are subjected to primary mixing and secondary mixing granulation to form a sintering mixture, calcium chlorate accounting for 5.5% of the total mass of the sintering mixture is added during the primary mixing and the secondary mixing granulation to obtain a sintering mixture B, 65% of the added calcium chlorate is added during the primary mixing, and the remaining 35% of the calcium chlorate is added during the secondary mixing granulation. The calcium chlorate is added in the form of a saturated solution.
In the grain size composition of the sintering mixture B, the grain size of not less than 3mm and not more than 5mm accounts for 40 percent of the total mass percentage; the granularity is more than 5mm and less than or equal to 8mm, and accounts for 34 percent of the total mass percent; the moisture content of the sintering mixture B is controlled at 7%, and the alkalinity is controlled at 1.9.
The sintering raw materials and the fuel are subjected to primary mixing and secondary mixing granulation to form a sintering mixture, calcium chlorate accounting for 4.5 percent of the total mass of the sintering mixture is added during the primary mixing and the secondary granulation to obtain a sintering mixture C, 70 percent of the added calcium chlorate is added during the primary mixing, and the rest 30 percent of the calcium chlorate is added during the secondary mixing granulation. The calcium chlorate is added in the form of a saturated solution.
In the grain size composition of the sintering mixture C, the grain size of not less than 3mm and not more than 5mm accounts for 48 percent of the total mass percentage; the granularity of more than 5mm and less than or equal to 8mm accounts for 26 percent of the total mass percent; the moisture content of the sintering mixture C is controlled at 7.5%, and the alkalinity is controlled at 1.9.
Firstly, adding a sintering mixture A cloth on a sintering trolley as a bottom layer sintering material, wherein the cloth thickness is 210 mm; then adding the sintering mixture B cloth on the bottom layer sintering material to be used as a middle layer sintering material, wherein the cloth thickness is 410 mm; finally, adding the sintering mixture C cloth on the middle-layer sintering material as an upper-layer sintering material, wherein the cloth thickness is 345 mm; and after the three sintering mixtures are completely added, igniting and exhausting air for sintering to obtain a finished sintering ore, wherein the ignition temperature is 1000 ℃, and the negative pressure of the exhausting air is 16000 Pa.
In the embodiment, the proportion of calcium ferrite in the sintered ore is increased to 43-45%; the drum strength of the sinter is improved to 87.2%, the low-temperature reduction degradation rate RDI +3.15 is improved to 86.4%, and the reducibility index is improved to 90%.
[ example 2 ]
The sintering raw materials and the fuel are subjected to primary mixing and secondary mixing granulation to form a sintering mixture, calcium chlorate accounting for 7% of the total mass of the sintering mixture is added during the primary mixing and the secondary mixing granulation to obtain a sintering mixture A, 65% of the added calcium chlorate is added during the primary mixing, and the remaining 35% of the calcium chlorate is added during the secondary mixing granulation. The calcium chlorate is added in the form of a saturated solution.
In the grain size composition of the sintering mixture A, the grain size of not less than 3mm and not more than 5mm accounts for 40 percent of the total mass percentage; the granularity of more than 5mm and less than or equal to 8mm accounts for 40 percent of the total mass percent; the moisture content of the sintering mixture A is controlled at 6.8%, and the alkalinity is controlled at 2.1.
The sintering raw materials and the fuel are subjected to primary mixing and secondary mixing granulation to form a sintering mixture, calcium chlorate accounting for 6% of the total mass of the sintering mixture is added during the primary mixing and the secondary mixing granulation to obtain a sintering mixture B, 70% of the added calcium chlorate is added during the primary mixing, and the rest 30% of the calcium chlorate is added during the secondary mixing granulation. The calcium chlorate is added in the form of a saturated solution.
In the grain size composition of the sintering mixture B, the grain size of not less than 3mm and not more than 5mm accounts for 44 percent of the total mass percentage; the granularity is more than 5mm and less than or equal to 8mm, and accounts for 34 percent of the total mass percent; the moisture content of the sintering mixture B is controlled to be 7.4%, and the alkalinity is controlled to be 2.1.
The sintering raw materials and the fuel are subjected to primary mixing and secondary mixing granulation to form a sintering mixture, calcium chlorate accounting for 4% of the total mass of the sintering mixture is added during the primary mixing and the secondary granulation to obtain a sintering mixture C, 75% of the added calcium chlorate is added during the primary mixing, and the remaining 25% of the calcium chlorate is added during the secondary mixing granulation. The calcium chlorate is added in the form of a saturated solution.
In the grain size composition of the sintering mixture C, the grain size of not less than 3mm and not more than 5mm accounts for 46 percent of the total mass percentage; the granularity of more than 5mm and less than or equal to 8mm accounts for 30 percent of the total mass percent; the moisture content of the sintering mixture C is controlled at 7.8%, and the alkalinity is controlled at 2.1.
Firstly, adding a sintering mixture A cloth on a sintering trolley as a bottom layer sintering material, wherein the cloth thickness is 245 mm; then adding the sintering mixture B cloth to the bottom layer sintering material to be used as a middle layer sintering material, wherein the cloth thickness is 500 mm; finally, adding the sintering mixture C cloth on the middle-layer sintering material as an upper-layer sintering material, wherein the cloth thickness is 310 mm; and after the three sintering mixtures are completely added, igniting and exhausting air for sintering to obtain a finished sintering ore, wherein the ignition temperature is 1050 ℃, and the negative pressure of the exhausting air is 14000 Pa.
In the embodiment, the proportion of calcium ferrite in the sintered ore is improved by 44-46 percent; the drum strength of the sinter is improved to 86.8%, the low-temperature reduction degradation rate RDI +3.15 is improved to 89.3%, and the reducibility index is improved to 89.6%.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (5)
1. A method for improving the metallurgical performance of sinter ore is characterized in that the sinter mixture is distributed in three layers, calcium chlorate is respectively added in the upper layer sinter mixture, the middle layer sinter mixture and the lower layer sinter mixture, the calcium chlorate is heated to decompose and release oxygen, the oxygen content in the sinter layer can be increased, the proportion of calcium ferrite in the sinter ore is increased, and the reducibility and the reflow drippability of the sinter ore are improved; meanwhile, calcium chloride is formed and evenly attached to the sinter, so that the low-temperature reduction powdering property of the sinter is improved; the method comprises the following specific steps:
(1) the sintering raw materials and the fuel are subjected to primary mixing and secondary mixing granulation to form a sintering mixture, calcium chlorate accounting for 6-7.5% of the total mass of the sintering mixture is added during the primary mixing and the secondary mixing granulation to obtain a sintering mixture A, 60-65% of the added calcium chlorate is added during the primary mixing, and the rest 35-40% of the calcium chlorate is added during the secondary mixing granulation; the calcium chlorate is added in the form of saturated solution;
(2) the sintering raw materials and the fuel are subjected to primary mixing and secondary mixing granulation to form a sintering mixture, calcium chlorate accounting for 4.5-6% of the total mass of the sintering mixture is added during the primary mixing and the secondary mixing granulation to obtain a sintering mixture B, 65-70% of the added calcium chlorate is added during the primary mixing, and the rest 30-35% of the calcium chlorate is added during the secondary mixing granulation; the calcium chlorate is added in the form of saturated solution;
(3) the sintering raw material and the fuel are subjected to primary mixing and secondary mixing granulation to form a sintering mixture, calcium chlorate accounting for 3.5-5% of the total mass of the sintering mixture is added during the primary mixing and the secondary mixing granulation to obtain a sintering mixture C, 70-75% of the added calcium chlorate is added during the primary mixing, and the rest 25-30% of the calcium chlorate is added during the secondary mixing granulation; the calcium chlorate is added in the form of saturated solution;
(4) firstly, adding a sintering mixture A cloth on a sintering trolley as a bottom layer sintering material, wherein the cloth thickness is 200-250 mm; then adding the sintering mixture B cloth to the bottom layer sintering material to be used as a middle layer sintering material, wherein the cloth thickness is 400-500 mm; finally, adding the sintering mixture C cloth on the middle-layer sintering material to serve as an upper-layer sintering material, wherein the cloth thickness is 300-350 mm;
(5) after all three sintering mixtures are added, igniting and exhausting air for sintering to obtain a finished sintering ore; the ignition temperature is 950-1050 ℃, and the negative pressure of air draft is 14000-18000 Pa.
2. The method of improving the properties of sinter metallurgy as claimed in claim 1, wherein the basicity of sinter mix A, sinter mix B and sinter mix C is the same and is 1.8-2.2.
3. The method of improving sinter metallurgy performance of claim 1, wherein the composition of the sinter mix A includes 35 to 40% by weight of the total composition, 3mm or less and 5mm or less; the granularity of more than 5mm and less than or equal to 8mm accounts for 35 to 40 percent of the total mass percentage; the moisture of the sintering mixture A is controlled to be 6.5-7%.
4. The method of improving sinter metallurgy performance as claimed in claim 1, wherein the composition of the sinter mix B is 40-45% by mass with a grain size of 3mm or less and a grain size of 5mm or less; the granularity of more than 5mm and less than or equal to 8mm accounts for 30 to 35 percent of the mass percent; the moisture of the sintering mixture B is controlled to be 7-7.5%.
5. The method of improving sinter metallurgy performance as claimed in claim 1, wherein the grain size composition of the sinter mix C is 45-50% by mass with a grain size of 3mm or less and a grain size of 5mm or less; the granularity is more than 5mm and less than or equal to 8mm, and accounts for 25 to 30 percent of the mass percent; the moisture of the sintering mixture B is controlled to be 7.5-8%.
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| CN110331244B (en) * | 2019-06-28 | 2021-04-13 | 武汉钢铁有限公司 | Blast furnace burden distribution adjusting method for reasonably using multi-grade sinter |
| CN112522507A (en) * | 2020-11-18 | 2021-03-19 | 攀钢集团研究院有限公司 | Method for improving quality of acid vanadium-titanium sinter |
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| JPS58123837A (en) * | 1982-01-18 | 1983-07-23 | Nisshin Steel Co Ltd | Manufacture of sintered iron ore having improved reduction powdering property at low temperature |
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| CN100408703C (en) * | 2006-09-08 | 2008-08-06 | 娄底市裕德科技有限公司 | Sintering ore additive |
| CN103509938B (en) * | 2012-06-20 | 2015-04-08 | 鞍钢股份有限公司 | Method for preventing excessive fusion of prereduced sinter |
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