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首页> 外国专利> Method for preparing high purity cobalt nitrate crystals using CO / SIO2 waste catalyst

Method for preparing high purity cobalt nitrate crystals using CO / SIO2 waste catalyst

机译：利用co / sio2废催化剂制备高纯硝酸钴晶体的方法

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Provided is a method for preparing high-purity cobalt nitrate crystals from Co/SiO 2 waste catalysts. The method sequentially comprises the following steps: 1) calcining Co/SiO 2 waste catalysts to be treated at 350 to 500°C under the existence of air for 3 to 6 hours, grinding the Co/SiO 2 waste catalysts into powder after cooling to the room temperature; 2) transferring the waste catalyst powder into a fluidized bed reactor and taking reduction reaction for 8 to 12 hours in mixed gas of H 2 and N 2 ; 3) adding the waste catalysts after the reduction reaction into excessive dilute nitric acid solution to be fully dissolved and filtering; 4) using alkali liquid for regulating the pH value of the obtained cobalt nitrate solution to 1.5, adding oxalic acid solution for reaction in the water bath of 25 to 80°C, regulating the pH value of the reacted solution to 1.5 by diluted alkali solution and filtering the hot solution to obtain cobalt oxalate precipitates; 5) after drying the cobalt oxalate precipitates, roasting the dried cobalt oxalate precipitates at the temperature of 550 to 650°C for 4 to 8 hours; 6) dissolving the obtained cobalt oxide by dilute nitric acid solution and 7) evaporating and crystallizing the cobalt nitrate solution to obtain Co(NO 3 ) 2 ·6H 2 O crystals. The recovery rate and the purity of the Co(NO 3 ) 2 ·6H 2 O in the method are high.
机译：提供了一种由Co / SiO 2废催化剂制备高纯度硝酸钴晶体的方法。该方法依次包括以下步骤：1）将Co / SiO 2废催化剂在空气存在下于350至500℃下煅烧3至6小时，冷却后将Co / SiO 2废催化剂磨成粉末。室温2）将废催化剂粉末转移到流化床反应器中，在H 2和N 2的混合气体中进行还原反应8至12小时。 3）将还原反应后的废催化剂加入过量的稀硝酸溶液中使其充分溶解并过滤; 4）用碱液将所得硝酸钴溶液的pH值调节至1.5，在25〜80℃的水浴中加入草酸溶液进行反应，用稀碱溶液将反应液的pH值调节至1.5。过滤热溶液得到草酸钴沉淀。 5）将草酸钴沉淀物干燥后，将干燥的草酸钴沉淀物在550〜650℃的温度下焙烧4〜8小时。 6）用稀硝酸溶液溶解所得的氧化钴，7）将硝酸钴溶液蒸发并结晶，得到Co（NO 3）2·6H 2 O晶体。该方法的回收率和Co（NO 3）2·6H 2 O的纯度均较高。

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