CN112553460B - Composite binder for improving pelletizing performance of super iron concentrate powder and using method thereof - Google Patents
Composite binder for improving pelletizing performance of super iron concentrate powder and using method thereof Download PDFInfo
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- CN112553460B CN112553460B CN202011404248.6A CN202011404248A CN112553460B CN 112553460 B CN112553460 B CN 112553460B CN 202011404248 A CN202011404248 A CN 202011404248A CN 112553460 B CN112553460 B CN 112553460B
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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
- C22B1/243—Binding; Briquetting ; Granulating with binders inorganic
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
The invention aims to solve the problem of green pellet burst generated in the process of preparing pellets by using super fine ore powder, provides a composite binder for improving the pelletizing performance of the super iron concentrate powder and a using method thereof, and belongs to the technical field of metallurgical raw materials and pretreatment. The invention relates to a composite binder for improving performance of a super iron ore concentrate powder-based pellet, which comprises the following components in percentage by mass: 55 to 60 percent of sodium bentonite; 25% -30% of coarse-particle coal powder; 5 to 10 percent of high-power water-absorbing resin; 5 to 10 percent of sodium carboxymethyl cellulose. The composite binder can replace bentonite as a pellet binder, can improve the bursting problem of pellets prepared from super fine ore powder, and improves the pellet quality.
Description
Technical Field
The invention belongs to the technical field of metallurgical raw materials and pretreatment, and particularly relates to a composite binder for improving the balling performance of super iron concentrate powder and a using method thereof.
Background
The pellet has the advantages of uniform granularity, high cold strength, high iron grade, good reducibility and the like, is an indispensable high-quality furnace charge, and has obvious positive effects on optimizing the structure of the furnace charge of the blast furnace, improving the economic indexes of the ironmaking technology, promoting energy conservation and consumption reduction and realizing environmental friendliness.
The super iron ore concentrate is a novel functional material with wide development prospect, and is also an important raw material for powder metallurgy, magnetic materials, super pure iron and clean steel base materials. Therefore, the super iron ore concentrate can also be used as a pellet raw material to prepare pellets. However, the super fine ore powder is common iron ore concentrate and is subjected to fine grinding and recleaning, so that the granularity is lower than that of the common iron ore concentrate, the minus 325 meshes reach 98 percent, the minus 400 meshes exceed 90 percent, and the minus 500 meshes exceed 75 percent. Because the grain size is fine and the iron content is high, the adoption of super iron ore concentrate as a raw material often affects the balling performance and the quality of pellet along with the problem of green pellet bursting. The existing adhesive can not improve the problem.
Disclosure of Invention
The invention aims to solve the problem of green pellet burst generated in the process of preparing pellets by using super fine ore powder, and provides a composite binder for improving the pelletizing performance of the super iron concentrate powder and a using method thereof. The composite binder can replace bentonite as a pellet binder, can improve the bursting problem of pellets prepared from super fine ore powder, and improves the pellet quality.
In order to achieve the purpose, the invention adopts the following technical scheme:
a composite binder for improving the balling performance of super iron ore concentrate powder comprises the following components in percentage by mass: 55 to 60 percent of sodium bentonite; 25% -30% of coarse-particle coal powder; 5 to 10 percent of high-power water-absorbing resin; 5 to 10 percent of sodium carboxymethylcellulose.
The iron grade of the super iron ore concentrate powder is more than or equal to 70 percent, the minus 325-mesh is more than or equal to 98 percent, the minus 400-mesh is more than 90 percent, and the minus 500-mesh is more than 75 percent.
The coarse-particle coal powder has the particle size of-200 meshes and accounts for 23-27%.
The viscosity of the sodium carboxymethylcellulose is 800-1200mpa · s, the water content is less than or equal to 10%, and the pH value is 6.5-9.5.
The high-power water-absorbing resin has the granularity of-200 meshes accounting for 90-95 percent, the water absorption rate of less than or equal to 30s and the water absorption multiple of 200-300 times.
The preparation method of the composite binder comprises the following steps: and uniformly mixing the sodium bentonite, the coarse-particle coal powder, the high-power water-absorbing resin and the sodium carboxymethyl cellulose according to the proportion to obtain a finished product.
The application method of the composite binder comprises the following steps: the composite binder and the super iron ore concentrate powder are mixed for pelletizing, and the adding amount of the composite binder is 0.6-0.7% of the total amount of the composite binder and the super iron ore concentrate according to the mass percentage.
Compared with the prior art, the invention has the advantages that:
(1) According to the invention, the sodium bentonite, the coarse-particle coal powder, the high-power water-absorbent resin and the sodium carboxymethylcellulose are compounded to prepare the composite binder for the first time, so that the conventional bentonite is replaced, the bursting problem of the pellet prepared from the super fine mineral powder can be effectively improved, and the pellet quality is improved.
(2) The main reason for improving the pellet burst problem is that the coarse-particle coal powder in the composite binder does not affect the iron grade of the pellets, the high-power water-absorbing resin has a high water-absorbing function of absorbing water which is hundreds to thousands times heavier than the self weight, and has a large amount of water-absorbing groups, a channel capable of releasing water can be formed in the heating process, the green pellet burst condition can be effectively relieved, and therefore the composite binder can play an important role in the process of preparing the pellets by using super fine mineral powder, and the pellet burst problem is improved.
Detailed Description
The invention will be further illustrated with reference to some specific embodiments.
In the following examples, the-325 mesh is 98% or more, the-400 mesh is 90% or more, and the-500 mesh is 75% or more of the super iron ore concentrate powder. The coarse-grain coal powder has a grain size of 23-27% in a range of-200 meshes. The viscosity of the sodium carboxymethylcellulose is 800-1200mpa · s, the water content is less than or equal to 10 percent, and the pH value is 6.5-9.5. The high-power water-absorbing resin has the granularity of-200 meshes accounting for 90 to 95 percent and the bulk density of 0.8g/cm 3 The water absorption rate is less than or equal to 30s, and the water absorption multiple is 200-300 times. Composite bentonite, jianping Huiyang chemical Co.
Example 1
The composite binder comprises the following components in percentage by mass: 55% of sodium bentonite; 30% of coarse-particle coal powder; 10% of high-power water-absorbent resin; 5 percent of sodium carboxymethyl cellulose. The components are mixed evenly according to the proportion to obtain the finished product.
Example 2
The composite binder comprises the following components in percentage by mass: 60% of sodium bentonite; 25% of coarse-particle coal powder; 5% of high-power water-absorbing resin; 10% of sodium carboxymethyl cellulose. The components are mixed evenly according to the proportion to obtain the finished product.
Example 3
The composite binder comprises the following components in percentage by mass: 58% of sodium bentonite; 27% of coarse-particle coal powder; 8% of high-power water-absorbent resin; 7 percent of sodium carboxymethyl cellulose. The components are mixed evenly according to the proportion to obtain the finished product.
Application experiments
1. The composite binder and the composite bentonite in example 1 are respectively mixed with super iron ore concentrate powder for pelletizing, the adding weight of the composite binder is 0.4%, 0.5%, 0.6%, 0.7% and 0.8% of the total weight of the composite binder and the super iron ore concentrate according to the mass percentage, and the adding amount of the comparative composite bentonite is 0.4%, 0.5%, 0.6%, 0.7% and 0.8% of the total weight of the composite bentonite and the super iron ore concentrate, which are respectively used as experiments 1-5 groups and controls 1-5.
2. The composite binder soils of examples 2 and 3 were respectively mixed with super iron ore concentrate powder for pelletizing, and the added weight of the composite binder was 0.6% by mass of the total weight of the composite binder and the super iron ore concentrate, as example 2 group and example 3 group, respectively.
TABLE 1 green pellet index comparison table
The technical indexes of the pellets in the laboratory require that the average falling strength of the green pellets is more than or equal to 4.5 times per pellet, and the average compressive strength of the green pellets is more than or equal to 12N. As can be seen from a green pellet index comparison table in the table 1, when the composite binder prepared by the invention is used in production, when the dosage proportion of the binder is 0.4 percent and 0.5 percent, the average green pellet falling strength is respectively 3.8 and 4.1 times per green pellet, and the requirements of the technical indexes of the laboratory pellets cannot be met; when the dosage proportion of the binder is 0.6%, the green ball quality is obviously improved; when the amount of the binder is 0.8%, although the drop strength and the compressive strength are both successful, the bursting occurs. In addition, it can be seen that sodium carboxymethylcellulose has a certain positive effect on falling strength of green pellets, and the water-absorbent resin plays an important role in bursting of green pellets. Finally, the optimum dosage proportion of the binder is comprehensively selected to be 0.6-0.7% by combining the index requirements of the pellets in the laboratory. At the moment, the average falling strength of green pellets is improved by 1.5 times per pellet, the compressive strength is improved by 3.11N per pellet, the bursting number (450 ℃) is reduced from 11 to 0, and the problem of pellet bursting is effectively improved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (4)
1. The composite binder for improving the balling performance of the super iron ore concentrate powder is characterized by comprising the following components in percentage by mass: 55% -60% of sodium bentonite; 25% -30% of coarse-particle coal powder; 5% -10% of high-power water-absorbing resin; 5% -10% of sodium carboxymethylcellulose;
the iron grade of the super iron ore concentrate powder is more than or equal to 70 percent, the minus 325-mesh is more than or equal to 98 percent, the minus 400-mesh is more than 90 percent, and the minus 500-mesh is more than 75 percent;
the coarse-particle coal powder has the particle size of 23-27% in a range of-200 meshes;
the high-power water-absorbing resin has the granularity of-200 meshes accounting for 90-95%, the water absorption rate being less than or equal to 30s, and the water absorption multiple being 200-300 times.
2. The composite binder for improving the pelletizing performance of super iron ore concentrate powder according to claim 1, wherein the viscosity of the sodium carboxymethylcellulose is 800-1200 mpa-s, the water content is less than or equal to 10%, and the pH value is 6.5-9.5.
3. The method for preparing the composite binder for improving the pelletizing performance of the super iron ore concentrate powder according to claim 1, wherein the finished product is obtained by mixing the sodium bentonite, the coarse-particle coal powder, the high-power water-absorbing resin and the sodium carboxymethylcellulose uniformly according to a proportion.
4. The method for using the composite binder for improving the pelletizing performance of the super iron ore concentrate powder in the claim 1, wherein the composite binder and the super iron ore concentrate powder are mixed for pelletizing, and the adding amount of the composite binder is 0.6-0.7% of the total amount of the composite binder and the super iron ore concentrate according to the mass percentage.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011404248.6A CN112553460B (en) | 2020-12-04 | 2020-12-04 | Composite binder for improving pelletizing performance of super iron concentrate powder and using method thereof |
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| CN202011404248.6A CN112553460B (en) | 2020-12-04 | 2020-12-04 | Composite binder for improving pelletizing performance of super iron concentrate powder and using method thereof |
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| CN112553460B true CN112553460B (en) | 2022-10-25 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1035196C (en) * | 1992-12-23 | 1997-06-18 | 中南工业大学 | Direct reduction technology for compound adhesive cool solidifying globus coal base |
| CN100562589C (en) * | 2007-12-27 | 2009-11-25 | 钢铁研究总院 | A kind of iron ore pellets sodium bentonite based binder and preparation method thereof |
| JP2009280849A (en) * | 2008-05-21 | 2009-12-03 | Nippon Shokubai Co Ltd | Pelletizing agent for iron-making raw material and pelletization method using the same |
| CN102260789A (en) * | 2010-12-07 | 2011-11-30 | 鞍钢集团矿业公司 | Pellet roasting and anti-explosion method |
| CN103468943A (en) * | 2013-09-27 | 2013-12-25 | 中信大锰（钦州）新材料有限公司 | Cold-pressing pallet production process of chromium fine ore |
| CN103600020B (en) * | 2013-12-03 | 2016-01-06 | 巩义市晶辉耐火材料有限公司 | A kind of binding agent and preparation method thereof |
| CN104651607B (en) * | 2015-02-05 | 2017-01-04 | 海城市托田炉料有限公司 | A kind of iron smelting pellets ore deposit magnesium iron-based organic binder bond |
| CN108531724A (en) * | 2018-06-15 | 2018-09-14 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of iron ore pellets novel bonding agent prescription and preparation method thereof |
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