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    • 1. 发明授权
    • Process for producing antimony trioxide having a low alpha-ray strength
    • 具有低α射线强度的生产三氧化锑的方法
    • US4532112A
    • 1985-07-30
    • US612256
    • 1984-05-21
    • Hiroshi NakahiraShigeki Kubo
    • Hiroshi NakahiraShigeki Kubo
    • C08K3/00C01G30/00C01G49/06C08K3/22H01L23/556C01G
    • H01L23/556C01G30/005C01P2004/61H01L2924/0002
    • At least an equivalent amount of concentrated hydrochloric acid is added to antimony trioxide containing a substance emitting alpha rays, and they are stirred. Any undissolved residue is removed to prepare an aqueous solution of antimony chloride. Water is added to the solution, or a distillate obtained by distilling it at a temperature of at least 135.degree. C. The quantity of the water is at least 10 times by volume as much as the solution, or at least 20 times by volume as much as the distillate. The solution or distillate and the water are stirred at a temperature of at least 60.degree. C. to cause precipitation of antimony trioxide, and the precipitate is separated by filtration. The precipitate is washed with at least 10 times by weight as much warm water having a temperature of 60.degree. C., and dried. This antimony trioxide has an alpha-ray strength not exceeding 0.01 C/cm.sup.2 per hour, does not contain more than 1 ppm of any impurities such as arsenic, lead or soluble chlorine, and has a large average particle size.
    • 将至少等量的浓盐酸加入到含有发射α射线的​​物质的三氧化锑中,并搅拌它们。 除去任何未溶解的残余物以制备氯化锑水溶液。 将水加入到溶液中,或通过在至少135℃的温度下蒸馏得到的馏出物。水的量为溶液的至少10倍体积,或至少20体积% 就像馏出物一样。 将溶液或馏出物和水在至少60℃的温度下搅拌,以使三氧化锑沉淀,并通过过滤分离沉淀物。 用至少10倍重量的温度为60℃的温水洗涤沉淀物并干燥。 该三氧化锑的α射线强度不超过0.01C / cm 2 /小时,不含有砷,铅或可溶性氯等杂质的1ppm以上,平均粒径大。
    • 2. 发明授权
    • Production of finely-divided particulate bismuth oxide
    • 细碎的颗粒状氧化铋的生产
    • US4675171A
    • 1987-06-23
    • US805098
    • 1985-12-05
    • Shigeki KuboOsamu Yamamoto
    • Shigeki KuboOsamu Yamamoto
    • B01J12/02B22F9/12C01B13/20C01B19/00C01G29/00C01B27/00
    • C01B19/004B01J12/02B22F9/12C01B13/20C01G29/00C01P2004/32C01P2004/61C01P2004/62
    • Finely-divided particulate bismuth oxide is produced by the steps of heating bismuth at 800.degree. C. or above in a first compartment of a sealed vessel divided into two compartments by a partition wall, the two compartments communicating with each other by a hole provided on the partition wall, feeding an inert gas such as nitrogen and argon into the first compartment so that the bismuth vapor formed by heating bismuth has a bismuth concentration of 0.1 to 0.5 g/liter, blowing air into the bismuth vapor introduced from the first compartment into the second compartment through the hole on the partition wall, permitting the air to mix with the bismuth vapor to form bismuth oxide and simultaneously cooling the thus formed bismuth oxide to 250.degree. to 300.degree. C., discharging by suction the bismuth oxide from the sealed vessel at a flow rate of 1 to 5 m/sec, and cooling the discharged bismuth oxide by supplying cooling air outside the sealed vessel.
    • 精细分散的颗粒状氧化铋是通过以下步骤制造的:通过在分隔壁分成两个隔室的密封容器的第一隔室中将800℃或更高的铋加热的步骤,两个隔室通过设置在 分隔壁将氮气和氩气等惰性气体供给到第一隔室,使得通过加热铋形成的铋蒸气的铋浓度为0.1〜0.5g / l,将空气吹入从第一隔室引入的铋蒸气 第二隔室通过分隔壁上的孔,允许空气与铋蒸气混合以形成氧化铋,同时将由此形成的氧化铋冷却至250℃至300℃,通过从密封的氧化铋中抽出氧化铋 容器,以1〜5m /秒的流速,通过在密封容器外部供给冷却空气来冷却排出的氧化铋。