CN108977654B - Sintering ore blending method based on iron ore segregation alkalinity liquid phase fluidity - Google Patents
Sintering ore blending method based on iron ore segregation alkalinity liquid phase fluidity 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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Abstract
The invention discloses a sintering ore blending method based on iron ore segregation alkalinity liquid phase fluidity, which mainly solves the technical problems of low strength and low yield of sintered ores produced by an ore blending method of iron ore liquid phase fluidity complementary matching under the condition of the same alkalinity in the prior art. The technical scheme of the invention is as follows: a sintering ore blending method based on iron ore segregation alkalinity liquid phase fluidity comprises the following steps: determining the segregation alkalinity liquid fluidity index of the iron ore used for sintering ore blending; and (3) carrying out complementary ore blending according to the measured segregation alkalinity liquid phase fluidity index of the iron ore, and matching the iron ore with high liquid phase fluidity index with the iron ore with low liquid phase fluidity index for ore blending. Compared with the existing complementary ore blending method for the liquid-phase fluidity index of the iron ore under the same alkalinity, the method provided by the invention realizes the great improvement of the quality index of the sintered ore.
Description
Technical Field
The invention relates to a method for producing sintered ore, in particular to a method for blending sintered ore based on the segregation alkalinity liquid-phase fluidity of iron ore, belonging to the technical field of production of iron-making raw material sintered ore.
Background
Optimizing sinter blending is a permanent topic of sinter production. The liquid phase fluidity of the iron ore is one of the important indexes of the basic characteristics of the iron ore, and is also an important factor for investigation and measurement when the ore blending is optimized. The liquid phase fluidity of iron ore means the ability of iron ore to react with CaO during sintering to form a liquid phase, which characterizes the extent to which the binder phase effectively binds. When the liquidity of the liquid phase is too low, the capability of the liquid phase for bonding surrounding materials is reduced, and the consolidation capability is reduced, so that the strength and the yield of the sinter are reduced; when the liquid phase fluidity is too high, the range of liquid phase bonding surrounding materials is large, the bonding thickness of the surrounding materials is thinned, and the sintered ore forms a thin-wall macroporous structure and becomes brittle as a whole, so that the strength and the yield of the sintered ore are reduced. Therefore, the appropriate liquid fluidity is the basis for ensuring effective consolidation of the sinter.
In the existing sintering ore blending process, an ore blending method of iron ore liquid phase fluidity complementary matching under the condition of the same alkalinity is adopted, generally, the liquid phase fluidity indexes of the iron ore under the condition of the same temperature and the same alkalinity are selected, and in the actual sintering production process, the temperature is the same at the same stage;the basicity of the mixture after uniform mixing and granulation is fixed on the whole, and the iron ore SiO serving as nuclear particles is locally the same although the CaO content in the adhesive powder is the same2Different contents and different alkalinity exist.
The low strength and the low yield of the sintered ore produced by the existing ore blending method with complementary matching of iron ore liquid phase fluidity under the same alkalinity condition are difficult problems in the industry.
Disclosure of Invention
The invention aims to provide a sintering ore blending method based on iron ore segregation alkalinity liquid phase fluidity, and mainly solves the technical problems of low strength and low yield of sintered ores produced by an ore blending method based on iron ore liquid phase fluidity complementary matching under the condition of the same alkalinity in the prior art.
The technical idea of the invention is to adopt the iron ore liquid phase fluidity index complementary method for ore blending under the condition of segregation alkalinity, and utilize the segregation alkalinity (under the same CaO content, because of the SiO content of the iron ore under the condition of the same CaO) according to the different alkalinity of the iron ore in the actual sintering production2Different alkalinity caused by different contents) under the condition, and overcomes the technical problems of low strength and low yield of the sintered ore produced by the ore blending method of complementarily matching the liquid-phase fluidity of the iron ore under the condition of the same alkalinity.
The invention adopts the technical scheme that a sintering ore blending method based on iron ore segregation alkalinity liquid phase fluidity comprises the following steps:
1) determining the segregation alkalinity liquid fluidity index of the iron ore used for sintering ore blending;
2) and (3) carrying out complementary ore blending according to the measured segregation alkalinity liquid phase fluidity index of the iron ore, and matching the iron ore with high liquid phase fluidity index with the iron ore with low liquid phase fluidity index for ore blending.
Based on the following research of the applicant, the method of the invention has the advantages that the liquid phase mobility of different types of iron ores is different, and the liquid phase mobility of the same type of iron ores is greatly changed at different temperatures and alkalinity. The liquid phase fluidity index of the segregation alkalinity (fixed CaO blending amount-CaO amount carried in by conversion according to the fixed alkalinity) of the iron ore is measured.
In the past, the liquid phase fluidity of the iron ore was generally studied by preparing samples in a fixed alkalinity manner, such as the basicity R being 4.0, but this manner is largely influenced by SiO content in the iron ore2Influence of the content. Under the condition of certain alkalinity, SiO2The iron ore with high content has large CaO dosage, thereby leading the liquid phase to have larger fluidity. In the actual sintering production process, SiO in the sintering ore2The content and the alkalinity are fixed values, so the addition amount of the calcareous flux of the mixture in the sintering process is also fixed values. After the uniform mixing and granulating process, the distribution of the calcareous flux in the mixture is uniform, so that the concentration of the calcareous flux distributed to each iron ore is the same, and the SiO of each iron ore2The contents are different, and in fact, the alkalinity difference exists, namely, each kind of iron ore reacts with each other under the condition of different alkalinity in the sintering process; according to the difference of the segregation alkalinity liquid phase fluidity indexes of the iron ores, reasonable complementary matching is carried out according to the high and low liquid phase fluidity of the iron ores, namely the iron ores with high liquid phase fluidity indexes are matched with the iron ores with low liquid phase fluidity indexes, so that the purposes of proper liquid phase fluidity and improvement of quality indexes of sintered minerals in the sintering process are achieved.
Compared with the prior art, the invention has the following positive effects: the method overcomes the influence of misleading of the liquid phase fluidity index of the iron ore and deterioration of the quality index of the sintered ore on the production possibly caused by the complementary ore blending under the same alkalinity, and realizes the great improvement of the quality index of the sintered ore by adopting the scheme of complementary ore blending of the liquid phase fluidity index of the iron ore under the condition of selecting the segregation alkalinity (fixing the CaO content).
Detailed Description
The present invention will be further illustrated by the following specific examples, which are to be construed as merely illustrative, and not limitative of the remainder of the disclosure in any way whatsoever.
A sintering ore blending method based on iron ore segregation alkalinity liquid phase fluidity comprises the following steps:
1) determining the segregation alkalinity liquid fluidity index of the iron ore for sintering ore blending by a micro sintering liquid flow sample method through a micro sintering test device;
2) and (3) carrying out complementary ore blending according to the measured segregation alkalinity liquid phase fluidity index of the iron ore, and matching the iron ore with high liquid phase fluidity index with the iron ore with low liquid phase fluidity index for ore blending.
The embodiment of the invention selects five common iron ores, takes the A ore as a reference ore, and respectively measures the A ore and the A ore at a sintering temperature of 1280 ℃: a liquid phase fluidity index with fixed alkalinity, wherein alkalinity R is 4.0; the liquid phase fluidity index in the case of segregation basicity was fixed by the amount of CaO added (calculated as the amount of CaO introduced when the basicity R was 4.0). The liquid phase fluidity index of iron ore at a sintering temperature of 1280 ℃ is shown in Table 1.
TABLE 1 liquid phase fluidity index of iron ore at a sintering temperature of 1280 ℃ for examples of the present invention
As shown in table 1, in the case of segregation basicity (compared with the fixed basicity), the liquid phase fluidity indexes of B ore, C ore, D ore and E ore are all changed greatly, B ore is increased, C ore, D ore and E ore are decreased and the decrease amplitudes are unequal; the ore blending protocol is shown in table 2.
Table 2 ore blending scheme of the present invention example
| Categories | Ore blending method | Ore blending scheme |
| Example 1 | Ore blending by complementary method of segregation alkalinity liquid phase fluidity | Ore A + ore C |
| Example 2 | Ore blending by complementary method of segregation alkalinity liquid phase fluidity | A ore + E ore |
| Prior Art | Blending ore according to fixed alkalinity liquid phase fluidity complementary method | A ore + B ore |
| Prior Art | Blending ore according to fixed alkalinity liquid phase fluidity complementary method | Ore A + ore D |
As shown in table 2, in example 1, when the a ore is used as the reference ore and the B ore or the C ore is selected for matching, the B ore is selected instead of the C ore in the conventional matching method of fixed alkalinity liquid fluidity, because the a ore has high liquid phase fluidity; the fluidity of the ore liquid phase is low; the fluid phase of the ore C has high fluidity and is close to that of the ore A; by a miniature sintering consolidation strength test method, the consolidation strength of the sintered body is 56.04% when the A ore is matched with the B ore, and the consolidation strength of the sintered body is not reduced and inversely increased when the A ore is matched with the C ore, which reaches 68.48% and increases by 12.44%. The main reasons are as follows: the fluidity of the A ore liquid phase is high, the fluidity of the B ore segregation alkalinity liquid phase is greatly increased, and the fluidity of the C ore segregation alkalinity liquid phase is greatly reduced, so that the A ore segregation alkalinity liquid phase is more suitable for matching with the A ore. Therefore, the complementary ore blending principle of segregation alkalinity liquid fluidity is more beneficial to the strength of the sintered ore. Example 2, when selecting from a ore a and an ore D or an ore E, according to the conventional rule of matching the fluidity of a liquid phase with a fixed alkalinity, the ore D should be selected instead of the ore E, because the fluidity of the liquid phase of the ore D is lower than that of the ore E. Through a miniature sintering consolidation strength test method, the consolidation strength of the sintered body is 48.96% when the A ore and the D ore are matched, and the consolidation strength of the sintered body is not reduced and inversely increased when the A ore and the E ore are matched, which reaches 53.48% and is increased by 4.52%. The main reasons are as follows: the fluidity of the segregation alkalinity liquid phase of the E ore is reduced to a larger extent, and the E ore is more suitable for matching with the A ore. Therefore, the complementary ore blending principle of segregation alkalinity liquid fluidity is more beneficial to the strength of the sintered ore.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (1)
1. A sintering ore blending method based on iron ore segregation alkalinity liquid phase fluidity is characterized by comprising the following steps:
1) determining the segregation alkalinity liquid fluidity index of the iron ore used for sintering ore blending;
2) and (3) carrying out complementary ore blending according to the measured segregation alkalinity liquid phase fluidity index of the iron ore, and matching the iron ore with high liquid phase fluidity index with the iron ore with low liquid phase fluidity index for ore blending.
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