Association of silica with diseases like cancers has been determined previously. This study was designed to determine the quantity of silis in flour produced in Golestan Province, and its relation to esophageal cancer...Association of silica with diseases like cancers has been determined previously. This study was designed to determine the quantity of silis in flour produced in Golestan Province, and its relation to esophageal cancer (EC). We took flour samples from all flour millings in Golestan Province. Base-melting method in nickel cruise was used at 550℃. The extract was reduced with acids. Different silis concentrations in various regions were compared. P < 0.05 was considered statistically significant. The median silis concentration was 0.0030 g, the mean silis concentration was 0.008760 ± 0.004265 g in each 100 g flour. The difference of mean silis concentrations in various regions was not significant. No high level of silica was found in the flour of Golestan Province. We could not find any significant difference in various areas between silica contaminations. Studies on the consumed bread and rice in various regions of Golestan Province can be helpful.展开更多
On July 1 st,Qingdao Dongyue Rhodia Chemicals Co.,Ltd.commenced production of the first phase 110 000 t/a sodium silicate project in Chengyang Advanced Materials Industry Park of Qingdao,Shandongprovince.The company i...On July 1 st,Qingdao Dongyue Rhodia Chemicals Co.,Ltd.commenced production of the first phase 110 000 t/a sodium silicate project in Chengyang Advanced Materials Industry Park of Qingdao,Shandongprovince.The company is jointly setup by Qingdao Hiwin Group Ltd.,展开更多
采用氧氮分析仪、扫描电镜、金相显微镜研究了160 t EAF-180 t AOD-LF-CC工艺生产304不锈钢的冶炼过程中全氧含量和夹杂物数量、尺寸、成分、类型等的衍变行为。AOD初始[C]2.0%~3.0%,[Si]0.2%~0.4%,终点[C]0.04%~0.06%,AOD终渣为(/%):53...采用氧氮分析仪、扫描电镜、金相显微镜研究了160 t EAF-180 t AOD-LF-CC工艺生产304不锈钢的冶炼过程中全氧含量和夹杂物数量、尺寸、成分、类型等的衍变行为。AOD初始[C]2.0%~3.0%,[Si]0.2%~0.4%,终点[C]0.04%~0.06%,AOD终渣为(/%):53.9%CaO,30.1SiO_2,1.34Al_2O_3,5.22MgO,8.74CaF_2,0.39Cr_2O_3,0.53TFe,0.62MnO,LF终渣为(/%):57.9CaO,21.6SiO_2,1.70Al_2O_3,6.30MgO,0.03Cr_2O_3,11.9CaF_2,0.26TFe,0.31 MnO。结果表明,AOD-LF-CC过程中氧含量逐渐降低,脱氧率达到71.0%,铸坯氧含量为25×10^(-6);在精炼过程中大型夹杂物数量明显降低,铸坯中没有出现≥20μm的夹杂物;在精炼过程钢中夹杂物主要以低熔点的硅酸盐为主,从LF终点至铸坯夹杂物中MgO和Al_2O_3含量分别升高了12%和17.5%,因温度降低,铸坯中残余的Mg、Al和O不断结合析出MgO-Al_2O_3尖晶石,同时残余的Mg、Al与低熔点的硅酸盐夹杂物发生反应形成高熔点的硅酸盐,所以铸坯中夹杂物主要以镁铝尖晶石和高熔点硅酸盐为主。展开更多
文摘Association of silica with diseases like cancers has been determined previously. This study was designed to determine the quantity of silis in flour produced in Golestan Province, and its relation to esophageal cancer (EC). We took flour samples from all flour millings in Golestan Province. Base-melting method in nickel cruise was used at 550℃. The extract was reduced with acids. Different silis concentrations in various regions were compared. P < 0.05 was considered statistically significant. The median silis concentration was 0.0030 g, the mean silis concentration was 0.008760 ± 0.004265 g in each 100 g flour. The difference of mean silis concentrations in various regions was not significant. No high level of silica was found in the flour of Golestan Province. We could not find any significant difference in various areas between silica contaminations. Studies on the consumed bread and rice in various regions of Golestan Province can be helpful.
文摘On July 1 st,Qingdao Dongyue Rhodia Chemicals Co.,Ltd.commenced production of the first phase 110 000 t/a sodium silicate project in Chengyang Advanced Materials Industry Park of Qingdao,Shandongprovince.The company is jointly setup by Qingdao Hiwin Group Ltd.,
文摘采用氧氮分析仪、扫描电镜、金相显微镜研究了160 t EAF-180 t AOD-LF-CC工艺生产304不锈钢的冶炼过程中全氧含量和夹杂物数量、尺寸、成分、类型等的衍变行为。AOD初始[C]2.0%~3.0%,[Si]0.2%~0.4%,终点[C]0.04%~0.06%,AOD终渣为(/%):53.9%CaO,30.1SiO_2,1.34Al_2O_3,5.22MgO,8.74CaF_2,0.39Cr_2O_3,0.53TFe,0.62MnO,LF终渣为(/%):57.9CaO,21.6SiO_2,1.70Al_2O_3,6.30MgO,0.03Cr_2O_3,11.9CaF_2,0.26TFe,0.31 MnO。结果表明,AOD-LF-CC过程中氧含量逐渐降低,脱氧率达到71.0%,铸坯氧含量为25×10^(-6);在精炼过程中大型夹杂物数量明显降低,铸坯中没有出现≥20μm的夹杂物;在精炼过程钢中夹杂物主要以低熔点的硅酸盐为主,从LF终点至铸坯夹杂物中MgO和Al_2O_3含量分别升高了12%和17.5%,因温度降低,铸坯中残余的Mg、Al和O不断结合析出MgO-Al_2O_3尖晶石,同时残余的Mg、Al与低熔点的硅酸盐夹杂物发生反应形成高熔点的硅酸盐,所以铸坯中夹杂物主要以镁铝尖晶石和高熔点硅酸盐为主。
