The rapid growth of semiconductor,photovoltaic,and other emerging industries has led to a sharp increase in the demand for high-purity quartz in China,particularly 4N5-grade(99.995%pure SiO_(2)).However,heavy reliance...The rapid growth of semiconductor,photovoltaic,and other emerging industries has led to a sharp increase in the demand for high-purity quartz in China,particularly 4N5-grade(99.995%pure SiO_(2)).However,heavy reliance on imported high-purity quartz poses a significant risk to the security of key national strategic industries.To address this challenge,China is focusing on identifying domestic sources of high-purity quartz and developing efficient evaluation methods.This study investigates the inclusion content in three types of quartz:pegmatite,vein quartz,and white granite.A grading system based on the transmittance of quartz grains was established by analyz-ing the number of inclusions.Five quartz ore samples from different regions were purified,and the resulting concentrates were analyzed using inductively coupled plasma mass spectrometry(ICP-MS).The relationships among the inclusion content of raw quartz,impurity composition of purified quartz,and quality of sintered fused quartz products were examined.The findings demonstrate that quartz with fewer inclusions results in lower impurity levels after purification,higher SiO_(2)purity,and more translucent glass,as confirmed by firing tests.Herein,this study establishes a clear connection between quartz inclusions and the overall quality of high-purity quartz.The pro-posed approach enables the rapid assessment of quartz deposit quality by identifying inclusions,offering a practical and efficient method for locating high-quality quartz resources.展开更多
The formation behaviors of terbium sesquisulfide(Tb_2S_3)and holmium sesquisulfide(Ho_2S_3)synthesized via the sulfurization of their oxide powders using CS_2 gas in the range of temperature 673 to 1323 K were investi...The formation behaviors of terbium sesquisulfide(Tb_2S_3)and holmium sesquisulfide(Ho_2S_3)synthesized via the sulfurization of their oxide powders using CS_2 gas in the range of temperature 673 to 1323 K were investigated. In the sulfurization of Tb_4O_7 powder, Tb_2O_3 and Tb_2O_2S were formed in the initial stage of reaction, and α-Tb_2S_3 was finally formed at higher temperature. For long sulfurization time of 8 h, single-phase α-Tb_2S_3 could be synthesized at 1323 K. In the sulfurization of Ho_2O_3 powder using CS_2 gas, only Ho_2O_2S was formed as an intermediate product. At a sulfurization temperature above 873 K, Ho_2O_2S was formed in the initial stage of reaction, and single-phase δ-Ho_2S_3 was formed at 1323 K for 8 h instead of Ho_2O_2S. Furthermore, the influence of the addition of carbon black to the sulfurization of Ho_2O_3 powder using CS_2 gas was investigated, and the result implied that the reactions were accelerated slightly by the addition of carbon black.展开更多
In this study,Al-65V alloy has been produced by electrode heating for 3−15 min.The impurities content,microstructure and the vanadium content of the alloy in the slag are investigated.The results indicate that differe...In this study,Al-65V alloy has been produced by electrode heating for 3−15 min.The impurities content,microstructure and the vanadium content of the alloy in the slag are investigated.The results indicate that different heating time shows obviously impacts not only on the impurities and microstructure of AlV alloy,but also on the vanadium recovery rate of slag.The impurities contents of C,O and N are 0.085%,0.022%and 0.036%,respectively,which meet the commercial standard when the electric heating time is controlled to 10 min,and the content of vanadium in slag is 0.18%.展开更多
During combined peanut harvesting operations,the separating device plays a crucial role in determining peanuts’damage rate and impurity content.In order to enhance the quality and efficiency of peanut harvesting,this...During combined peanut harvesting operations,the separating device plays a crucial role in determining peanuts’damage rate and impurity content.In order to enhance the quality and efficiency of peanut harvesting,this study investigates the separating device of a two-ridge and four-row half-feeder combine harvester.Firstly,the operating principle of the separating device was analyzed,and a combined air-and-screen separating device was selected.Secondly,based on the movement state of peanut pod impurities in different sections of the separating device surface,the theoretical analysis of peanut pod impurity movement was carried out,and the peanut pod impurity dynamics model was constructed.At the same time,CFD software was used to analyze the airflow field inside the separating device.Moreover,the test factors affecting the separating effect were explored:fan wind speed,separating device surface inclination,and vibration frequency.The optimal working parameters of the device were determined as follows:a fan wind speed of 8.9 m/s,a separating device surface inclination angle of 8.3°concerning the horizontal,and a separating device vibration frequency of 7.2 Hz.The impurity content rate of the peanut pods was 1.48%,and the damage rate of the separating device was 1.61%.Finally,the impurity content of peanuts in the validation experiment was 1.53%,and the peanut damage rate was 1.68%.The effectiveness of the separating device operation was verified through field tests.The potential for further research on peanut harvesters is highlighted based on the findings of this study.展开更多
基金financially supported by the Consulting Research Project of the Chinese Academy of Engineering,China(Nos.2024-XBZD-10 and 2024-XZ-20).
文摘The rapid growth of semiconductor,photovoltaic,and other emerging industries has led to a sharp increase in the demand for high-purity quartz in China,particularly 4N5-grade(99.995%pure SiO_(2)).However,heavy reliance on imported high-purity quartz poses a significant risk to the security of key national strategic industries.To address this challenge,China is focusing on identifying domestic sources of high-purity quartz and developing efficient evaluation methods.This study investigates the inclusion content in three types of quartz:pegmatite,vein quartz,and white granite.A grading system based on the transmittance of quartz grains was established by analyz-ing the number of inclusions.Five quartz ore samples from different regions were purified,and the resulting concentrates were analyzed using inductively coupled plasma mass spectrometry(ICP-MS).The relationships among the inclusion content of raw quartz,impurity composition of purified quartz,and quality of sintered fused quartz products were examined.The findings demonstrate that quartz with fewer inclusions results in lower impurity levels after purification,higher SiO_(2)purity,and more translucent glass,as confirmed by firing tests.Herein,this study establishes a clear connection between quartz inclusions and the overall quality of high-purity quartz.The pro-posed approach enables the rapid assessment of quartz deposit quality by identifying inclusions,offering a practical and efficient method for locating high-quality quartz resources.
文摘The formation behaviors of terbium sesquisulfide(Tb_2S_3)and holmium sesquisulfide(Ho_2S_3)synthesized via the sulfurization of their oxide powders using CS_2 gas in the range of temperature 673 to 1323 K were investigated. In the sulfurization of Tb_4O_7 powder, Tb_2O_3 and Tb_2O_2S were formed in the initial stage of reaction, and α-Tb_2S_3 was finally formed at higher temperature. For long sulfurization time of 8 h, single-phase α-Tb_2S_3 could be synthesized at 1323 K. In the sulfurization of Ho_2O_3 powder using CS_2 gas, only Ho_2O_2S was formed as an intermediate product. At a sulfurization temperature above 873 K, Ho_2O_2S was formed in the initial stage of reaction, and single-phase δ-Ho_2S_3 was formed at 1323 K for 8 h instead of Ho_2O_2S. Furthermore, the influence of the addition of carbon black to the sulfurization of Ho_2O_3 powder using CS_2 gas was investigated, and the result implied that the reactions were accelerated slightly by the addition of carbon black.
基金Project(51734006)supported by the National Natural Science Foundation of ChinaProject(2014HA003)supported by the Cultivating Plan Program for the Leader in Science and Technology of Yunnan Province of China+1 种基金Project(2017HB009)supported by the Science and Technological Talent Cultivation Plan of Yunnan Province,ChinaProject(2017HA006)supported by the Program for the Academician Free Exploration Fund of Yunnan Province,China
文摘In this study,Al-65V alloy has been produced by electrode heating for 3−15 min.The impurities content,microstructure and the vanadium content of the alloy in the slag are investigated.The results indicate that different heating time shows obviously impacts not only on the impurities and microstructure of AlV alloy,but also on the vanadium recovery rate of slag.The impurities contents of C,O and N are 0.085%,0.022%and 0.036%,respectively,which meet the commercial standard when the electric heating time is controlled to 10 min,and the content of vanadium in slag is 0.18%.
基金financially sponsored by the Key R&D Program(Major Science and Technology Innovation Project)in Shandong Province(Grant No.2021CXGC010813)the National Key Research and Development Program(Grant No.2022YFD2300100).
文摘During combined peanut harvesting operations,the separating device plays a crucial role in determining peanuts’damage rate and impurity content.In order to enhance the quality and efficiency of peanut harvesting,this study investigates the separating device of a two-ridge and four-row half-feeder combine harvester.Firstly,the operating principle of the separating device was analyzed,and a combined air-and-screen separating device was selected.Secondly,based on the movement state of peanut pod impurities in different sections of the separating device surface,the theoretical analysis of peanut pod impurity movement was carried out,and the peanut pod impurity dynamics model was constructed.At the same time,CFD software was used to analyze the airflow field inside the separating device.Moreover,the test factors affecting the separating effect were explored:fan wind speed,separating device surface inclination,and vibration frequency.The optimal working parameters of the device were determined as follows:a fan wind speed of 8.9 m/s,a separating device surface inclination angle of 8.3°concerning the horizontal,and a separating device vibration frequency of 7.2 Hz.The impurity content rate of the peanut pods was 1.48%,and the damage rate of the separating device was 1.61%.Finally,the impurity content of peanuts in the validation experiment was 1.53%,and the peanut damage rate was 1.68%.The effectiveness of the separating device operation was verified through field tests.The potential for further research on peanut harvesters is highlighted based on the findings of this study.
