Method for production of alkali metal chromates from chrome ores
    1.
    发明授权
    Method for production of alkali metal chromates from chrome ores 失效
    铬矿生产碱金属铬酸盐的方法

    公开(公告)号:US4244925A

    公开(公告)日:1981-01-13

    申请号:US58975

    申请日:1979-07-20

    IPC分类号: C01G37/14 C22B34/22 C01G31/00

    CPC分类号: C01G37/14 C22B34/22

    摘要: A method for producing alkali metal chromates by a single roast of chrome ores without the use of calcium oxide is disclosed. A double roast embodiment is also contemplated for obtainment of enhanced yields. The pollution and hygiene problems associated with the use of lime are substantially eliminated and only negligible amounts of alumina are found in the product chromate liquors without employing steps previously thought necessary. These advantages are achieved by controlling (1) the Bichromate Equivalent: aluminum oxide ratio in the mix, (2) the amount of alkali metal salts added to the mix, (3) the roasting time, (4) the composition and alkalinity of the liquor used for leaching the roast, and (5) the temperature employed. Recovery of vanadium values from the alkali metal chromate liquors is also disclosed.

    摘要翻译: 公开了一种不使用氧化钙通过单一焙烧的铬矿生产碱金属铬酸盐的方法。 为了获得增加的产量,也考虑了双烤实施例。 与使用石灰相关的污染和卫生问题基本上被消除,并且在产品铬酸盐液体中仅发现可忽略量的氧化铝,而不采用先前认为必要的步骤。 这些优点通过控制(1)混合中的重铬酸当量:氧化铝比例,(2)加入到混合物中的碱金属盐的量,(3)焙烧时间,(4)组成和碱度 用于浸出烤的酒,和(5)使用的温度。 还公开了从碱金属铬酸盐液体中回收钒值。

    Process for converting hexafluoroarsenic acid or any salt thereof to
arsenic acid or salt thereof which can then be rendered nonhazardous
    2.
    发明授权
    Process for converting hexafluoroarsenic acid or any salt thereof to arsenic acid or salt thereof which can then be rendered nonhazardous 失效
    将六氟砷酸或其盐转化成砷酸或其盐,然后可以使其成为非危险的方法

    公开(公告)号:US5089241A

    公开(公告)日:1992-02-18

    申请号:US633652

    申请日:1990-12-20

    摘要: The present invention provides a process for the conversion of hazardous hexafluoroarsenic acid or any salt thereof to arsenic acid or salt thereof which can be rendered nonhazardous. In particular, the hexafluoroarsenic acid or salt is converted to arsenic acid or salt which can be converted to a water insoluble salt. Known insolubilization and stabilization technology then renders the material nonhazardous.The present process involves converting hexafluoroarsenic acid or salt thereof contained in an aqueous mixture to arsenic acid or salt thereof. The process comprises the steps of: (a) adding acid selected from the group consisting of sulfuric acid, arsenic acid, perchloric acid, and mixtures thereof to the aqueous mixture in an amount sufficient to catalyze the hydrolysis of the hexafluoroarsenic acid or salt thereof and raising the temperature of the aqueous mixture before, during, or after the acid addition sufficient to remove substantially all of the hydrogen fluoride in subsequent step (b); (b) passing an inert gas through the heated acid mixture steam in a quantity sufficient to remove substantially all of the hydrogen fluoride in the heated acid mixture from the heated acid mixture; and (c) separating substantially all of the hydrogen fluoride from the heated acid mixture whereupon the hexafluoroarsenic acid or salt thereof converts substantially to arsenic acid or salt thereof.

    摘要翻译: 本发明提供了将危险的六氟砷酸或其盐转化成可以变得不危险的砷酸或其盐的方法。 特别地,将六氟砷酸或盐转化为可转化为水不溶性盐的砷酸或盐。 已知的不溶化和稳定化技术使材料无害化。 本方法涉及将含水混合物中所含的六氟砷酸或其盐转化为砷酸或其盐。 该方法包括以下步骤:(a)以足以催化六氟砷酸或其盐的水解的量向该含水混合物中加入选自硫酸,砷酸,高氯酸及其混合物的酸,以及 在酸加入之前,期间或之后提高含水混合物的温度,足以在随后的步骤(b)中除去基本上所有的氟化氢; (b)使惰性气体通过加热的酸性混合物蒸汽,其量足以从加热的酸混合物中除去加热的酸混合物中的基本上所有的氟化氢; 和(c)从加热的酸混合物中基本上分离所有氟化氢,因此六氟砷酸或其盐基本上转化为砷酸或其盐。

    Corrosion resistant austenitic alloy
    3.
    发明授权
    Corrosion resistant austenitic alloy 失效
    耐腐蚀奥氏体合金

    公开(公告)号:US4487744A

    公开(公告)日:1984-12-11

    申请号:US402638

    申请日:1982-07-28

    IPC分类号: C22C30/00

    CPC分类号: C22C30/00 Y10T428/12931

    摘要: An austenitic stainless corrosion resistant alloy and articles made therefrom having good resistance to pitting and crevice corrosion in oxidizing chloride-bearing media combined with resistance to general corrosion and to intergranular corrosion in oxidizing media, containing in weight percent about______________________________________ w/o______________________________________C 0.06 Max.Mn 1.4 Max.Si 0.9 Max.P 0.035 Max.S 0.035 Max.Cr 20-26Ni 34-44Mo 3-

    摘要翻译: 奥氏体不锈钢耐腐蚀合金及其制成的制品在氧化含氯介质中具有良好的耐点蚀和缝隙腐蚀性,并具有耐腐蚀性和耐氧化介质中的晶间腐蚀,其重量百分比约为-w / o-C 0.06 最大 -Mn 1.4最大 -Si 0.9最大 -P 0.035最大 -S 0.035最大 -Cr 20-26 -Ni 34-44 -Mo 3- <5.1 -Cu 0.1- <3.1 -N 0.4最大 -B 0.005最大 -Ce + La 0.4最大 添加-Nb 1最大 -Ti 0.5最大 - 和平衡铁。 氮的量不大于可以保留在溶液中的量。 当存在铌加钛时,其最小值范围向上,这足以使化学计量与超过0.025w / o的碳的量结合。 在该组合物中,元素铬,镍,钼和铜的平衡使得相关I的值等于或小于1.6021,相关II的值等于或小于5.相关I:1.6021等于或大于 (%Cr)-0.0769(%Ni)-0.046(%Mo)+0.03(%Cu)+0.0017(%Ni)2 + 0.048 6(%Mo)2-0.0066(%Ni) (%Mo)。 相关性II:5等于或大于14.7182-0.3759(%Cr)+0.0986(%Ni)-1.2976(%Mo)+0.02(%Cu)-0.0165(%Cr)(%Mo)-0.0202 (%Cr)(%Cu)+0.0223(%Ni)(%Cu)。

    Method for production of alkali metal chromates from chrome ores
    4.
    发明授权
    Method for production of alkali metal chromates from chrome ores 失效
    铬矿生产碱金属铬酸盐的方法

    公开(公告)号:US4162295A

    公开(公告)日:1979-07-24

    申请号:US851230

    申请日:1977-11-14

    IPC分类号: C01G37/14

    CPC分类号: C01G37/14

    摘要: A method for producing alkali metal chromates by double roasting chrome ores without the use of alkaline earths is disclosed. The pollution and hygiene problems associated with the use of lime are substantially eliminated and only negligible amounts of alumina are found in the product chromate liquors without employing steps previously thought necessary. These advantages are achieved by controlling (1) the Bichromate Equivalent: aluminum oxide ratio in the mix, (2) the amount of alkali metal salts added to the mix, (3) the roasting time, (4) the composition and alkalinity of the liquor used for leaching the roast, and (5) the temperature employed, in both roasts.

    摘要翻译: 公开了一种不使用碱土金属通过双重焙烧铬矿生产碱金属铬酸盐的方法。 与使用石灰相关的污染和卫生问题基本上被消除,并且在产品铬酸盐液体中仅发现可忽略量的氧化铝,而不采用先前认为必要的步骤。 这些优点通过控制(1)混合中的重铬酸当量:氧化铝比例,(2)加入到混合物中的碱金属盐的量,(3)焙烧时间,(4)组成和碱度 用于浸出烤的酒,和(5)在两种烤肉中使用的温度。