Extraction of vanadium from stone coal by modified salt-roasting process

In order to reduce the pollution of Cl₂ and HCl released during extracting vanadium from stone coal by sodium chloride roasting, a modified salt-roasting process was proposed by adding calcined lime in roasting process followed by H₂SO₄ leaching. The effects of parameters including roasting temperature, roasting time, addition mass ratio of NaCl, calcined lime upon leaching rate of vanadium and curing rate of chlorine were investigated, and the effects of leaching time and leaching temperature on leaching rate of vanadium were also studied. The results show that the vanadium leaching rate and the curing rate of chlorine are 67.3% and 51.5% (mass fraction), respectively, at roasting temperature of 750 °C, roasting time of 4 h, 15% sodium chloride and 8% (mass fraction) calcined lime, leaching temperature of room temperature, and leaching time of 4 h.     

HCR工艺处理盐酸金霉素生产废水的试验

采用高效好氧生物反应器HCR处理盐酸金霉素生产废水,结果表明,在进水ρ(COD)高达20 g/L、ρ(氨氮)高达2～3 g/L,且废水中含有大量对微生物有抑制作用的残留抗生素的情况下,COD的去除率高达70%以上.同时,废水中的氨氮也有一定去除效果,且反应器在运行过程中不受废水中SO24-的影响.由此可以说明,HCR作为盐酸金霉素废水一级处理,在技术上是可行的.     

高纯盐酸中游离氯的脱除技术

介绍了高纯盐酸中游离氯对离子膜法烧碱生产的危害，亚硫酸钠脱除游离氯的原理以及在高纯盐酸中应用的工艺技术。     

浅谈三合一炉石英灯头

我国自1966年开始使用三合一炉法合成盐酸以来,目前已有近20个厂家使用三合一炉合成盐酸。三合一炉已受到使用厂家的一致好评。使用厂家最关心的问题之一,就是三合一炉的灯头问题,因为它影响到三合一炉的生产能力、制酸成本及石墨筒的使用寿命。     

氢氧化钠—盐酸法生产氧化锆二次除硅工艺的研究

本文对传统的氢氧化钠—盐酸法生产氧化锆中二次除硅工艺进行了研究,提出了水处理盐酸提取氧氯化锆体系的方法,对于硅胶的分离和洗涤取得了较满意的结果,为较低温度下采用抽滤法提供了依据。     

我厂设计的A3型“三合一”盐酸石墨炉简介

高纯盐酸生产装置的稳定运行,是保证离子膜法制碱装置正常生产的重要条件,其产品质量是影响全氟离子交换膜使用寿命的关键因素。我厂于1986年从日本旭化成公司引进1万吨/年离子膜制碱装置及与其配套的高纯盐酸装置。同年10月,在高纯盐酸生产装胃投产运行后发现,无论在工艺上,还是在设备上,远不能满足离子膜法制     

矿热电炉硅微粉纯化研究

硅微粉是硅铁或金属硅冶炼过程中产生的副产品。二氧化硅含量（纯度）较低的硅微粉是一种固体废弃物，污染环境，但是纯度超过88％的硅微粉是一种重要的无机非金属纳米材料。本文对酸法提纯硅微粉进行了正交实验研究，试验结果表明：酸浓度、固液比、反应方式对纯化影响显著；20％盐酸溶液与硅微粉（固液比3g：200mL）在搅拌速率300r／min时反应3h硅微粉纯度可达到92．79％。同时本文采用X射线小角度散射仪、扫描电镜（SEM）、比表面积仪等仪器对纯化前后硅微粉的特性进行了对比测定分析，结果表明纯化后的硅微粉应用性能明显提高。     

原子吸收光谱法测定工业用合成盐酸中铁含量的研究

提出用空气-乙炔火焰原子吸收光谱法测定工业用合成盐酸中的铁含量的方法，综合考虑了样品消化处理条件、影响测定的相关因素。该方法具有较高的灵敏度，很好的重现性，操作简单，容易掌握，干扰少等特点。     

盐酸乙脒生产新工艺研究

介绍了以乙腈，甲醇，液氮，和氯化氢为原料，生产医药维生素Ｂ１中间体盐酸乙脒的生产新工艺。新工艺优化了传统工艺指标，改变了过程的操作方法，使产品收率提高１０％以上，产品质量好，年产３００吨盐酸乙脒生产新工艺已通过省级鉴定。     

2,3,5-Triphenyl-2H-tetrazolium Chloride and 2,4,6-Tri（2-pyridyl）-s-triazine on the Corrosion of Mild Steel in HCl

Electrochemical measurement, quantum chemical method, and scanning electron microscopy （SEM） were performed to investigate the inhibitive effect of 2,3,5-triphenyl-2H-tetrazolium chloride （TTC） and 2,4,6-tri（2-pyridyl） -s-triazine（TPT） on the corrosion of mild steel in lmol.L^-1 HCl at room temperature. Impedance spectroscopy measurement showed that the polarization resistance increased and that double layer capacitance decreased with the increase in the inhibitive concentration, and the results of potentiodynamic polarization showed that the inhibitors suppressed both cathodic and anodic processes of steel corrosion without change in the mecha-nism. Higher the orbital density distribution strength of the lowest unoccupied molecular orbital, higher is the molecule dipole, and lower energy gap between the energy of the highest occupied molecular orbital and the energy of the lowest unoccupied molecular orbital resulted in higher inhibitory efficiency. The results of SEM analysis showed that the metal-was protected from aggressive corrosion by the addition of TTC and TPT.