Effects of CaO addition on the CuW composite containing micro- and nano-sized tungsten particles synthesized via aluminothermic coupling with silicothermic reduction

Author:

Cheng Chu123,Wang Xinyu1,Song Kexing4,Song Ziwei1,Dou Zhihe5,Zhang Mengen1,Liu Haitao1,Li Xiaoheng6,Niu Liye7

Affiliation:

1. School of Materials Science and Engineering, Henan University of Science and Technology , Luoyang 471023 , China

2. Provincial and Ministerial Co-construction Collaborative Innovation Center of Nonferrous New Materials and Advanced Processing Technology , Luoyang 471023 , China

3. Henan Key Laboratory of Non-ferrous Materials Science & Processing Technology, Henan University of Science and Technology , Luoyang 471003 , China

4. Henan Academy of Sciences , Zhengzhou , 450002 , China

5. Key Laboratory of Ecological Metallurgy of Multi-metal Intergrown Ores, Ministry of Education, Northeastern University , Shenyang , Liaoning, 110819 , China

6. Henan Zhongyuan Gold Smelter., LLC , Sanmenxia , 472100 , China

7. Chinalco Luoyang Copper Processing Co., Ltd , Luoyang , 471039 , China

Abstract

Abstract CuW composite fabricated by powder metallurgy using ultrafine metal powders as raw materials has the disadvantages such as uneven microstructure and low compactness. A novel method of synthesizing an as-cast CuW composite ingot via an aluminothermic coupling with silicothermic reduction is presented; a low-melting-point CaO–Al2O3–SiO2 slag is formed by adding CaO as a slag former, effectively reducing Al2O3 inclusion in the CuW composite. In this study, the effects of CaO addition on the novel synthesis of the CuW composite via the aluminothermic coupling with silicothermic reduction are investigated. The result shows that CaO affects the removal of large particles (≥6 µm) but not the removal of small particles (≤4 µm). With the increase in the ratio of CaO ranging from 0 to 1.0, the inclusions in the CuW composites gradually transform from Al2O3 to calcium aluminates, which are conducive to the separation of the metal and slag. The contents of Si and O in the CuW composites gradually decrease from 9.40 and 14.00% to 6.10 and 3.50%, respectively, while those of Al and Ca gradually increase from 2.54 and 0.02% to 3.83 and 0.26%, respectively.

Publisher

Walter de Gruyter GmbH

Subject

Surfaces, Coatings and Films,Process Chemistry and Technology,Energy Engineering and Power Technology,Biomaterials,Medicine (miscellaneous),Biotechnology

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