含1,2,3-三唑的新型硫脲和氨基硫脲的合成

利用2-苯基-1,2,3-三唑-4-甲酰基异硫氰酸酯与2-氨基取代苯并噻唑和2-肼基取代苯并噻唑的加成反应合成了一系列二取代硫脲和氨基硫脲衍生物。研究了合成反应的条件。目标化合物经元素分析、IR和1^HNMI进行了结构确证。     

酸性硫脲法提金的研究

研究了硫脲作为主要溶金剂 ,并对各种因素进行了试验 ,选出了最佳提金方案 ,浸出率达 96.8% ,硫脲耗量只有 1 .5kg/t。     

Behavior of surface action between ethyl thiourea and chalcopyrite

1　ＩＮＴＲＯＤＵＣＴＩＯＮＩｔｉｓｗｅｌｌｋｎｏｗｎｔｈａｔｔｈｅａｄｓｏｒｐｔｉｏｎｃｈａｒａｃｔｅｒｉｓ ｔｉｃｏｆｆｌｏｔａｔｉｏｎｒｅａｇｅｎｔｏｎｍｉｎｅｒａｌｉｓａｄｅｃｉｓｉｖｅｆａｃｔｏｒｔｏｆｌｏｔａｔｉｏｎ .Ｕｓｕａｌｌｙ ,ｐｈｙｓｉｃａｌａｄｓｏｒｐｔｉｏｎｃａｕｓｅｄｂｙｖａｎｄｅｒＷａｌｌｓｆｏｒｃｅｏｒｅｌｅｃｔｒｏｓｔａｔｉｃｆｏｒｃｅｉｓｗｅａｋｗｉｔｈｎｏｏｒｌｉｔｔｌｅｓｅｌｅｃｔｉｖｉｔｙ ,ａｎｄｅｘｉｓｔｓａｍｏｎｇａｌｌｋｉｎｄｓｏｆｒｅａｇｅｎｔｓａｎ…     

Corrosion of silver in environment containing halides,pseudohalides, or thiourea

Many studies of silver corrosion have been focused on indoor sulfur-containing atmospheres. However, significant corrosion damage of silver can also occur in the presence of other corrosion stimulants, such as halides, pseudohalides, or thiourea. These environments pose a specific threat for historical silver objects like daguerreotypes or coins, for example, during incorrect storing or cleaning method. To better characterize the silver corrosion caused by the solutions, electrochemical impedance spectroscopy (EIS) and electrical resistance technique were used. EIS measurements show that the dissolution of silver in tested solutions is mainly controlled by diffusion, suggesting the formation of a layer on the sample surface. For the electrical resistance technique, two different setups with electrical resistance probes were used: in saturated solutions and in atmospheric conditions simulating corrosion under deposits. In the latter setup, the corrosion rates decreased after a certain amount of time which can be explained by the presence of a salt layer (as suggested from EIS results). Regardless of the arrangement, cyanide and thiourea environment resulted in the highest corrosion rates.     

Adsorption of gold-thiourea complex on activated carbon

The adsorption kinetics of the gold-thiourea complex on activated charcoal was studied. Experimental runs were made in a batch reactor at constant temperatures and stirred by a magnetic system. Samples were taken at different periods of time and were analyzed for gold in a Perkin-Elmer Model 360 atomic absorption spectrophotometer. The samples were prepared with synthetic solution of gold with thiourea, sulfuric acid, and iron sulfate with concentrations similar to the ones in the leaching process. The gold adsorbed on activated charcoal was 99% at 20°C. The adsorption behavior was characterized by the Freundlich model at different temperatures (20°C, 35°C and 50°C).     

含硫缓蚀剂基于量化参数的定量构效-活性相关研究

采用MP3半经验分子轨道算法对17种硫脲及其衍生物缓蚀剂进行了优化计算，由计算得到的多个量化参数与实验数据构建QsAR模型，对模型进行稳健性评价，利用优级相关的模型得到了与实验值极为接近的理论预测值。     

D001大孔强酸型树脂吸附硫脲金的研究

研究了在弱酸性介质中，Ｄ００１大孔强酸型树脂吸附及分离硫脲金的性能。结果表明，在ｐＨ≈２．０，树脂对硫脲金离子Ａｕ（Ｔｕ）有良好的吸附（Ｔｕ＝硫脲），静态吸附容量可达６１．１８ｍｇ／ｇ－Ｒｅｓｉｎ。饱和吸附柱可用０．１ｍｏｌ·Ｌ￣（－１）ＮａＯＨ—０．１ｍｏｌ·Ｌ￣（－１）ＮａＣＮ混合溶液定量洗脱。     

用硫脲法从铜阳极泥中提金的研究

本文研究了用酸性硫脲溶液从铜阳极泥中浸取金的方法。通过考察各种因素对浸取金的影响，确定了最佳浸取条件。并进一步研究了活性炭对硫脲浸金液的吸附情况，确定了吸附最佳条件。     

几种还原性化合物防止真丝绸泛黄性能的研究

本文对甲酸铵、盐酸羟胺、硫代硫酸钠、尿素及硫脲等还原性化合物对真丝绸的防泛黄性能进行了研究.除硫脲具有明显的防泛黄作用外,其余化合物均无作用.对硫脲的防泛黄性能、处理方法及防泛黄机理作了详细研究.     

从废弃印刷线路板中回收金的试验

试验研究了采用硫脲法有效地从废弃印刷线路板中回收金。试验结果表明，硫脲回收金的主要影响因素有：温度、硫脲质量浓度、Fe^3＋质量分数、浸出时间、硫酸体积分数；合适的浸出条件是：固液比为1：5，浸出温度为35℃，硫脲质量浓度为10g／l，Fe^3＋抖质量分数为0．3％，浸出时间为1h，硫酸体积分数为5％。