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    Process for recovering chromic anhydride from exhausted aqueous chromium plating bath solutions with exploitation of the recovered chromium
    1.
    发明授权
    Process for recovering chromic anhydride from exhausted aqueous chromium plating bath solutions with exploitation of the recovered chromium 失效
    从已被回收的铬中利用的过滤的铬酸盐溶液溶液中回收铬酸酐的方法

    公开(公告)号：US5112583A

    公开(公告)日：1992-05-12

    申请号：US573019

    申请日：1990-11-07

    申请人： Giuseppe Bruzzone ,  Giovanni Ghelli ,  Diego Perrone

    发明人： Giuseppe Bruzzone ,  Giovanni Ghelli ,  Diego Perrone

    IPC分类号： C01G37/033 ,  C01G37/08 ,  C01G37/14 ,  C14C3/06

    CPC分类号： C14C3/06 ,  C01G37/033 ,  C01G37/08 ,  C01G37/14

    摘要： The chromic anhydride contained in soluble form (chromic acid) in exhausted, polluted chromium plating baths is recovered by alkalizing the exhausted chromium plating liquid to a pH comprised between 3 and 7 at a temperature of 70.degree. C. with a commercial sodium hydroxide solution, keeping the mass in reaction at this temperature for an hour and filtration separating the precipitate obtained. The filtered solution having a specific gravity of 1.25 kg/l, contains CrO.sub.3 (22% in weight) which is then reduced with sulphur dioxide to obtain a solution containing basic chromium sulphate and sodium sulphate, suitable for use as a tanning bath; in this manner pollution is avoided and the waste chromium is exploited. The solution containing CrO.sub.3 can also be introduced into a hexavalent chromium salt production cycle.

    摘要翻译： PCT No.PCT / IT88 / 00038 Sec。 371日期1990年11月7日 102（e）1990年11月7日日期PCT提交1988年5月24日PCT公布。 出版物WO89 / 09188 日期为1989年10月5日。耗尽的污染铬电镀液中可溶形式（铬酸）中含有的铬酸酐通过将耗尽的镀铬液碱化至在70℃的3至7之间的pH来回收。 用商业氢氧化钠溶液，将该物质在该温度下保持1小时，并过滤分离得到的沉淀物。 比重为1.25kg / l的过滤溶液含有CrO 3（22重量％），然后用二氧化硫还原，得到适合用作鞣制浴的碱式硫酸铬和硫酸钠溶液; 以这种方式避免污染，并利用废铬。 含CrO3的溶液也可以引入六价铬盐生产周期。

    Process for the preparation of alkaline chromates from chromium minerals
    2.
    发明授权
    Process for the preparation of alkaline chromates from chromium minerals 失效
    从铬矿物制备碱性铬酸盐的方法

    公开(公告)号：US5374408A

    公开(公告)日：1994-12-20

    申请号：US941441

    申请日：1992-10-22

    申请人： Giuseppe Bruzzone ,  Diego Perrone ,  Alfredo Parodi

    发明人： Giuseppe Bruzzone ,  Diego Perrone ,  Alfredo Parodi

    IPC分类号： C01G37/14 ,  C22B34/32

    CPC分类号： C22B34/32 ,  C01G37/14 ,  Y02P20/129

    摘要： A process for the production of alkaline chromates by means of oxidative disaggregation in a reactor of substances containing trivalent chromium compounds in admixture with alkali. The oxidative disaggregation is carried out in dry phase by moving the mixture within the reactor while heating the mixture by indirect heat exchange in the absence of combustion gases and under mechanical stress, and feeding to the interior of the reactor oxidizing gas. The mixture is heated to a temperature of between 500.degree. and 1500.degree. C. The oxidizing gas is fed with an oxygen concentration in a range between 8 and 100%. Gases leaving the reactor are used for the acidification of an aqueous solution of alkaline chromates which is then dried and supplied to the reactor. The reactor is a rotating tubular reactor and the mixture moves continuously through the rotating reactor.

    摘要翻译： PCT No.PCT / IT91 / 00034 Sec。 371日期：1992年10月22日 102（e）日期1992年10月22日PCT 1991年4月29日PCT PCT。 公开号WO91 / 17118 日期：1991年11月14日。一种在含有三价铬化合物与碱混合的物质的反应器中通过氧化分解生产碱性铬酸盐的方法。 通过在反应器内移动混合物，通过在不存在燃烧气体和机械应力的情况下通过间接热交换加热混合物，并将其进料到反应器内部的氧化气体，进行氧化分解。 将混合物加热至500℃至1500℃的温度。氧化气体的氧浓度在8至100％的范围内。 离开反应器的气体用于酸化铬酸铬水溶液，然后将其干燥并供入反应器。 反应器是旋转管状反应器，混合物连续移动通过旋转反应器。

    Method for recovering and exploiting waste of the chromic anhydride production
    4.
    发明授权
    Method for recovering and exploiting waste of the chromic anhydride production 失效
    回收和利用铬酸酐生产废弃物的方法

    公开(公告)号：US4045340A

    公开(公告)日：1977-08-30

    申请号：US704954

    申请日：1976-07-13

    申请人： Diego Perrone

    发明人： Diego Perrone

    IPC分类号： C01G37/00 ,  C01G37/02 ,  C01G37/033 ,  C01G37/04 ,  C01G37/14 ,  C02B1/20

    CPC分类号： C01G37/033 ,  C01P2006/80 ,  C01P2006/82 ,  Y10S210/913

    摘要： A process of recovering and exploiting wastes from chromic anhydride production, wherein the slurry comprising a water suspension of solid waste residue from chromic anhydride processing is subjected to a first reaction stage with sodium chromate solution at a constant flow rate and such a density as to avoid precipitation of sodium sulfate, setting pH to 2-8 by adjusting the slurry flow rate, and finally separating by filtering insoluble chromium chromate formed from the sodium bichromate and sodium sulfate solution.

    摘要翻译： 一种从铬酸酐生产中回收和利用废物的方法，其中将包含来自铬酸酐处理的固体废物残留物的水悬浮液的浆料以一定的流速和这样的密度与铬酸钠溶液进行第一反应阶段，以避免 沉淀硫酸钠，通过调节浆料流速将pH设定为2-8，最后通过过滤由重铬酸钠和硫酸钠溶液形成的不溶性铬酸铬分离。

    Anhydrous sodium dichromate in flakes; process and apparatus for its preparation on an industrial scale
    5.
    发明授权
    Anhydrous sodium dichromate in flakes; process and apparatus for its preparation on an industrial scale 失效
    薄片中无水重铬酸钠; 工业和仪器在工业规模的准备

    公开(公告)号：US4759922A

    公开(公告)日：1988-07-26

    申请号：US788161

    申请日：1985-10-16

    申请人： Diego Perrone

    发明人： Diego Perrone

    IPC分类号： B01J2/24 ,  B01J19/00 ,  C01G37/14

    CPC分类号： C01G37/14 ,  Y02P20/124

    摘要： A new anhydrous sodium dichromate in flakes, Na.sub.2 Cr.sub.2 O.sub.7, m.p. 356.degree. C. (dec. 400.degree. C.) is described, characterized in that it comes in flakes with an area of approx. 1 cm.sup.2, thickness 0.5 mm and apparent specific gravity 1.10 (absolute 2.748) at 25.degree. C.; it is not deliquescent, nor does it become powdery. It is prepared from dihydrate sodium dichromate or aqueous solutions thereof using a new process in two stages, namely (a) evaporation-melting of the dihydrate salt or concentrated aqueous solution at a strictly controlled temperature of around 380.degree. C. and no higher, and (b) flaking of the melted mass obtained thereby, as it is being rapidly cooled to 150.degree.-160.degree. C. The apparatus for carrying out the process is also claimed; said apparatus consisting essentially of a dehydrator-melter oven, a flaker rotating at 10-20 revs per minute and a heat recovery system. The thermic contribution, respectively positive and negative in the two stages, is provided by means of a particular eutectic mixture of melted salts, which melts at 139.degree. C. Said mixture is composed of KNO.sub.3 52.2%, NaNO.sub.3 7.0%, NaNO.sub.2 39.4%, K.sub.2 Cr.sub.2 O.sub.7 1.4%.

    摘要翻译： 一种新的无水重铬酸钠，Na2Cr2O7，m.p。 描述了356℃（分解温度为400℃），其特征在于，其面积约为 在25℃下，1cm 2，厚度0.5mm，表观比重1.10（绝对值2.748）。 它不潮解，也不会变粉。 它是由二水合物重铬酸钠或其水溶液制成的，分两步使用新工艺，即：（a）在约380℃和不高于严格控制的温度下二水合盐或浓缩水溶液的蒸发熔融，以及 （b）将其快速冷却至150℃-160℃，由此获得的熔融物质剥落。还要求实施该方法的装置; 所述设备基本上由脱水机 - 胶机烘箱，以每分钟10-20转/分转动的平板机和热回收系统组成。 两个阶段的热贡献分别为正和负两种，通过熔融盐熔融的特殊的共熔混合物提供，熔点为139℃。所述混合物由KNO3 52.2％，NaNO3 7.0％，NaNO 3 39.4％， K2Cr2O7 1.4％。

    Preparation of anhydrous sodium dichromate flakes
    6.
    发明授权
    Preparation of anhydrous sodium dichromate flakes 失效
    无水重铬酸钠薄片的制备

    公开(公告)号：US5037620A

    公开(公告)日：1991-08-06

    申请号：US149593

    申请日：1988-01-28

    申请人： Diego Perrone

    发明人： Diego Perrone

    IPC分类号： B01J2/24 ,  B01J19/00 ,  C01G37/14

    CPC分类号： C01G37/14 ,  Y02P20/124

    摘要： A new anhydrous sodium dichromate in flakes, Na.sub.2 Cr.sub.2 O.sub.7, m.p. 356.degree. C. (dec. 400.degree. C.) is described, characterized in that it comes in flakes with an area of approx. 1 cm.sup.2, thickness 0.5 mm and apparent specific gravity 1.10 (absolute 2.748) at 25.degree. C; it is not deliquescent, nor does it become powdery. It is prepared from dihydrate sodium dichromate or aqueous solutions thereof using a new process in two stages, namely a) evaporation-melting of the dihydrate salt or concentrated aqueous solution at a strictly controlled temperature of around 380.degree. C. and no higher, and b) flaking of the melted mass obtained thereby, as it is being rapidly cooled to 150.degree.-160.degree. C. The apparatus for carrying out the process is also disclosed; the apparatus includes a dehydrator-melter oven, a flaker rotating at 10-20 revs per minute and a heat recovery system. The thermic contribution, respectively positive and negative in the two stages, is provided by a particular eutectic mixture of melted salts, which melts at 139.degree. C. The mixture is composed of KNO.sub.3 52.2%, NaNO.sub.3 7.0%, NaNO.sub.2 39.4%, K.sub.2 Cr.sub.2 O.sub.7 1.4%.

    Chromium hydroxide precipitate obtained by a continuous process for the removal of chromium from waste waters
    7.
    发明授权
    Chromium hydroxide precipitate obtained by a continuous process for the removal of chromium from waste waters 失效
    通过连续的方法获得的氢氧化铬沉淀物用于从废水中除去铬

    公开(公告)号：US4560546A

    公开(公告)日：1985-12-24

    申请号：US484614

    申请日：1983-04-13

    申请人： Diego Perrone ,  Alberto Patrone ,  Elvio Caffarelli

    发明人： Diego Perrone ,  Alberto Patrone ,  Elvio Caffarelli

    IPC分类号： C02F1/62 ,  C01G37/00 ,  C01G37/02 ,  C02F9/00 ,  C22B34/32 ,  C02F1/54

    CPC分类号： C22B34/32 ,  C01G37/02 ,  C01P2006/80 ,  C01P2006/82 ,  C02F2103/22 ,  C02F2103/24 ,  Y10S210/913

    摘要： A chromium hydroxide precipitate obtained by a continuous process is described, wherein chromium containing waste waters are subjected to continuous hot treatment with acetic acid or with alkaline acetates and alkaline hydroxides at a temperature from 40.degree. C. to boiling point and at atmospheric pressure, at a pH higher than 6.5, preferably between 7 and 10, particularly about 7.5. Thus, a "sandy" type of chromium hydroxide is obtained, having a titer in Cr.sub.2 O.sub.3 of 20 to 40% by weight, which quickly filters, is easily soluble in acids, and thereby affords an easy valorization both as a tanning agent and as a raw material for preparing other chromium compound.

    摘要翻译： 描述了通过连续方法获得的氢氧化铬沉淀物，其中使用乙酸或碱性乙酸盐和碱金属氢氧化物在-40℃至大约压力的温度下，对含铬废水进行连续热处理， pH高于6.5，优选为7至10，特别是约7.5。 因此，获得“沙质”型氢氧化铬，其Cr 2 O 3滴定度为20〜40重量％，其快速过滤，易溶于酸，因此提供了作为鞣剂和作为鞣剂的容易的增贵作用 制备其他铬化合物的原料。