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| Study on Pellet Reduction of Calcium Tungstate with Carborundum |
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Received:August 21, 2012
Revised:August 25, 2012
Accepted:August 27, 2012
Published Online:February 19, 2013
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| DOI：10.3969/j.issn.1007-7545.2013.03.006 |
| KeyWord:calcium tungstate;pellet;carborundum;reduction |
| Author | Institution |
| LIU Ji-gang |
钢铁研究总院 冶金工艺研究所 |
| LI Zheng-bang |
钢铁研究总院 冶金工艺研究所 |
| LIU Yan-hua |
北京能泰环保产业集团公司 |
| YANG Hai-sen |
钢铁研究总院 冶金工艺研究所 |
| Liang Lin-bao |
江阴市长兴钒氮新材料有限公司;江阴市长兴钒氮新材料有限公司 |
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| Abstract: |
| The reduction of calcium tungstate pellet with carborundum under different reaction time, temperature, and dosage of reductant was studied through constant high temperature test and pellet melting point test. The relationship between the reduction rate and the above factors was analyzed and the optimum parameters of direct alloying steelmaking process were obtained. The results show that the reduction reactions, in solid-solid state or solid-liquid state, can occur at 1 400~1 500 ℃ with the products of W, WC, Ca3(Si3O9) and SiO2. The reactions of carborundum phase transition and decomposition, oxidation of reductant and tungsten also occur in the heating process. At 1 400~1 500 ℃ with the duration of 10~30 min, the reduction rate of the pellet can be improved with longer reaction time at low temperature or shorter time at a high temperature, and with increase in the dosage of reductant. The tungsten direct alloying can be achieved mainly in the early stage of steel making process by calcium tungstate reduce and avoid the oxidation of tungsten. |
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