Effect of Basicity on the Reduction Swelling Performance of Pellets Prepared from Bayan Obo Iron Ore Concentrate Based on Microscopic Characterization
The development of blast furnace smelting technology with a high proportion of pellets is an important means for improving the utilization rate of complex co-associated mineral resources. The effect of basicity on the reduction swelling performance of pellets prepared from Bayan Obo iron ore concent...
| Main Authors: | , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2022-10-01
|
| Series: | Crystals |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2073-4352/12/10/1399 |
| _version_ | 1797473991734067200 |
|---|---|
| author | Yifan Chai Yingjie Fan Xing Gao Guoping Luo Yici Wang Shengli An Jinzhou Liu |
| author_facet | Yifan Chai Yingjie Fan Xing Gao Guoping Luo Yici Wang Shengli An Jinzhou Liu |
| author_sort | Yifan Chai |
| collection | DOAJ |
| description | The development of blast furnace smelting technology with a high proportion of pellets is an important means for improving the utilization rate of complex co-associated mineral resources. The effect of basicity on the reduction swelling performance of pellets prepared from Bayan Obo iron ore concentrate is characterized by the aspects of microscopic morphology, element distribution and weight-loss behavior. The results show that with the increase in basicity, the reduction swelling rate and the weight-loss rate of pellets follows the change rule by first increasing and then decreasing. With a basicity of 0.8, the pellets have the largest swelling rate (75.743%) and the largest weight-loss rate (24.77%). The reduction swelling rate is proportional to the porosity and inversely proportional to the amount-of-liquid phase. In the first stage of reduction, pellets with a basicity of 0.8 changed from tabular to granular, and there were a large number of cracks. In the third stage of reduction, pellets with a basicity of 0.8 had coarse iron whiskers. In the same reduction stage, the amount of K and Na elements in the pellets with a basicity of 0.8 entering the iron oxide lattice was much larger than that in the pellets with a different basicity. As the reduction progresses, the ability of alkali metals to enter the iron oxide gradually increases. |
| first_indexed | 2024-03-09T20:25:01Z |
| format | Article |
| id | doaj.art-2d63326740724791bc8a8a14faec7f3c |
| institution | Directory Open Access Journal |
| issn | 2073-4352 |
| language | English |
| last_indexed | 2024-03-09T20:25:01Z |
| publishDate | 2022-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Crystals |
| spelling | doaj.art-2d63326740724791bc8a8a14faec7f3c2023-11-23T23:37:49ZengMDPI AGCrystals2073-43522022-10-011210139910.3390/cryst12101399Effect of Basicity on the Reduction Swelling Performance of Pellets Prepared from Bayan Obo Iron Ore Concentrate Based on Microscopic CharacterizationYifan Chai0Yingjie Fan1Xing Gao2Guoping Luo3Yici Wang4Shengli An5Jinzhou Liu6School of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, ChinaSchool of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, ChinaSchool of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, ChinaSchool of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, ChinaSchool of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, ChinaSchool of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, ChinaState Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, ChinaThe development of blast furnace smelting technology with a high proportion of pellets is an important means for improving the utilization rate of complex co-associated mineral resources. The effect of basicity on the reduction swelling performance of pellets prepared from Bayan Obo iron ore concentrate is characterized by the aspects of microscopic morphology, element distribution and weight-loss behavior. The results show that with the increase in basicity, the reduction swelling rate and the weight-loss rate of pellets follows the change rule by first increasing and then decreasing. With a basicity of 0.8, the pellets have the largest swelling rate (75.743%) and the largest weight-loss rate (24.77%). The reduction swelling rate is proportional to the porosity and inversely proportional to the amount-of-liquid phase. In the first stage of reduction, pellets with a basicity of 0.8 changed from tabular to granular, and there were a large number of cracks. In the third stage of reduction, pellets with a basicity of 0.8 had coarse iron whiskers. In the same reduction stage, the amount of K and Na elements in the pellets with a basicity of 0.8 entering the iron oxide lattice was much larger than that in the pellets with a different basicity. As the reduction progresses, the ability of alkali metals to enter the iron oxide gradually increases.https://www.mdpi.com/2073-4352/12/10/1399basicitypelletsreduction swellingmicroscopic morphologyreduction reaction |
| spellingShingle | Yifan Chai Yingjie Fan Xing Gao Guoping Luo Yici Wang Shengli An Jinzhou Liu Effect of Basicity on the Reduction Swelling Performance of Pellets Prepared from Bayan Obo Iron Ore Concentrate Based on Microscopic Characterization Crystals basicity pellets reduction swelling microscopic morphology reduction reaction |
| title | Effect of Basicity on the Reduction Swelling Performance of Pellets Prepared from Bayan Obo Iron Ore Concentrate Based on Microscopic Characterization |
| title_full | Effect of Basicity on the Reduction Swelling Performance of Pellets Prepared from Bayan Obo Iron Ore Concentrate Based on Microscopic Characterization |
| title_fullStr | Effect of Basicity on the Reduction Swelling Performance of Pellets Prepared from Bayan Obo Iron Ore Concentrate Based on Microscopic Characterization |
| title_full_unstemmed | Effect of Basicity on the Reduction Swelling Performance of Pellets Prepared from Bayan Obo Iron Ore Concentrate Based on Microscopic Characterization |
| title_short | Effect of Basicity on the Reduction Swelling Performance of Pellets Prepared from Bayan Obo Iron Ore Concentrate Based on Microscopic Characterization |
| title_sort | effect of basicity on the reduction swelling performance of pellets prepared from bayan obo iron ore concentrate based on microscopic characterization |
| topic | basicity pellets reduction swelling microscopic morphology reduction reaction |
| url | https://www.mdpi.com/2073-4352/12/10/1399 |
| work_keys_str_mv | AT yifanchai effectofbasicityonthereductionswellingperformanceofpelletspreparedfrombayanoboironoreconcentratebasedonmicroscopiccharacterization AT yingjiefan effectofbasicityonthereductionswellingperformanceofpelletspreparedfrombayanoboironoreconcentratebasedonmicroscopiccharacterization AT xinggao effectofbasicityonthereductionswellingperformanceofpelletspreparedfrombayanoboironoreconcentratebasedonmicroscopiccharacterization AT guopingluo effectofbasicityonthereductionswellingperformanceofpelletspreparedfrombayanoboironoreconcentratebasedonmicroscopiccharacterization AT yiciwang effectofbasicityonthereductionswellingperformanceofpelletspreparedfrombayanoboironoreconcentratebasedonmicroscopiccharacterization AT shenglian effectofbasicityonthereductionswellingperformanceofpelletspreparedfrombayanoboironoreconcentratebasedonmicroscopiccharacterization AT jinzhouliu effectofbasicityonthereductionswellingperformanceofpelletspreparedfrombayanoboironoreconcentratebasedonmicroscopiccharacterization |