硫酸铵厂房和构筑物的腐蚀防护

与硫酸铵接触的部分建筑物和构筑物腐蚀严重，混凝土因腐蚀而剥落并露出钢筋，危害厂房的安全使用，通过对混凝土遭受腐蚀原因的分析，提出了相应的防护措施。     

水泥-矿渣粉-粉煤灰复合胶凝材料特性研究

对水泥、矿渣、粉煤灰分别粉磨复配制成复合胶凝材料,并与硅酸盐水泥进行水化热、水化性能、抗硫酸盐性能的对比研究.结果证实:复合胶凝材料的水化热较低,抗硫酸盐性能好,耐久性好:而且生产复合胶凝材料对降低水泥产品环境负荷具有良好的效果.     

聚硅硫酸铝处理长江水的生产性应用研究

用聚硅硫酸铝处理长江水进行生产性应用研究,研究结果表明:与硫酸铝相比,聚硅硫酸铝可降低混凝剂投加量20%~30%;在混凝剂投加量相近时,浊度平均值降低20%～50%;可以增大澄清池处理量15%;投加聚硅硫酸铝,滤池的主要运行参数及效能没有受到不利的影响.     

硫酸镁的性质和用途及生产方法

介绍了硫酸镁的物理、化学性质和用途,阐述了硫酸镁的生产方法及工艺流程:硫酸法,盐湖苦卤法,苦卤复晒法,高温盐溶浸法,震荡转化法,碳酸化法,二氧化硫催化法.     

Electrochemical impedance spectroscopy and corrosion behaviour of Al2O3-Ni nano composite coatings

In this paper, the results on the electrochemical impedance spectroscopy and corrosion properties of electrodeposited nanostructured Al₂O₃-Ni composite coatings are presented. The nanocomposite coatings were obtained by codeposition of alumina nanoparticles (13 nm) with nickel during plating process. The coating thickness was 50 μm on steel support and an average of nano Al₂O₃ particles inside of coatings at 15 vol.% was present. The structure of the coatings was investigated by scanning electron microscopy (SEM). It has been found that the codeposition of Al₂O₃ particles with nickel disturbs the nickel coating's regular surface structure. The electrochemical behavior of the coatings in the corrosive solutions was investigated by polarization potentiodynamic and electrochemical impedance spectroscopy methods. As electrochemical test solutions 0.5 M sodium chloride and 0.5 M potassium sulphate were used in a three electrode open cell. The corrosion potential is shifted to more negative values for nanostructured coatings in 0.5 M sodium chloride. The polarization resistance in 0.5 M sodium chloride decreases in 24 h, but after that increases slowly. In 0.5 M potassium sulphate solution the polarization resistance decreases after 2 h and after 30 h of immersion the polarization resistance is higher than that of the beginning value. The corrosion rate calculated by polarization potentiodynamic curves obtained after 30 min from immersion in solution is smaller for nanostructured coatings in 0.5 M potassium sulphate (4.74 μm/year) and a little bit bigger in 0.5 M sodium chloride (5.03 μm/year).     

Extraction of aluminium as aluminium sulphate from thermal power plant fly ashes

Valuable metal extraction technology from thermal power plant fly ash is limited. In the present study, aluminium is extracted from fly ash as highly pure aluminium sulphate (>99.0%) by leaching with sulphuric acid, followed by pre-concentration and successive crystallization. Two types of fly ashes from different sources, i.e., Talcher Thermal Power Station (TTPS) and Vedanta Aluminium Company Limited (VAL) were chosen for comparative study on the extraction of aluminium as aluminium sulphate. The product is characterized by powder X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA). Purity of aluminium sulphate was also investigated by inductively coupled plasma–optical emission spectrometry (ICP–OES). The extraction efficiency of aluminium depends on the varied solid-to-liquid ratio (fly ash : 18 mol/L H₂SO₄, g/mL) and particle size of fly ashes. Physico-chemical analysis indicates that the obtained product is Al₂(SO₄)₃·18H₂O, having low iron content (0.08%).     

三聚氰胺碳铵液的回收和利用

介绍三聚氰胺碳铵液回收,利用的方法,一是用碳铵液蒸发,分解,再与硫酸中和反应生成硫铵;二是用碳铵液生产尿素。获得了良好的经济效益和社会效益。     

硫酸法硫酸钾生产中氯化氢吸收系统的技术改进

介绍传统硫酸法生产硫酸钾过程中,氯化氢吸收系统的工艺流程及生产情况。针对该装置副产氯化氢的基本特征,从提高盐酸产品质量和氯化氢综合利用的角度对流程作了改进,取得了良好的经济效益和环保效益。     

由废触媒回收制备硫酸镍的研究

阐述了以双氧水车间废触媒为原料,制备七水硫酸酸镍的工艺条件,该工艺对原料的适应性广,且除杂效果好,镍回收率达９５％以上,产品质量符合ＧＢ／Ｔ６３９２－８６的要求。     

Ti-B位置换改性硅酸镁陶瓷的微观结构与微波介电性能

研究了Ti-B位置换改性Mg2SiO4陶瓷微结构和微波介电性能.结果表明;在合成Mg2SiO4陶瓷过程中,Mg2SiO3总是作为第二相出现,Ti的引入能够有效地抑制Mg2SiO3的出现;但是,Ti不是进入Si-O四面体取代置换Si形成Mg2(Si1-xTix)O4固溶体,而是Mg与反应形成Mg2TiO4、Mg2Ti2O5等第二相.随着x值增加,Mg2(Si1-xTix)O4陶瓷的相对介电常数(εr)从6.8增加到8.1,机械品质因数与频率乘积(Q×f)也获得显著改善,但谐振频率温度系数(τf)不会因Ti引入而得到优化.在x=0.1时,Mg2(Si0.9Ti0.1)O4陶瓷获得最优的微波介电性能:εr=7.4,Q×f=73760GHz,τf=-6×10-6/℃.