含氟烟气治理-干法净化技术

本文主要论述烧结烟气净化技术及应用前景.我厂进行的半工业试验的干法、半干法烟气净化技术的要点.     

铝行业烟气净化及余热利用研究

介绍了铝行业窑炉烟气现状以及在窑炉烟气余热回收利用及废气净化方面所做的一些研究和探索,包括烟气净化、余热利用、回收利用CO_2等不同途径下的试验情况及存在的相关问题,同时展望了烟气净化及回收利用的广阔前景。     

稀土合金冶炼烟气净化研究

本文就以氧化钙作吸附剂干法净化稀土精矿冶炼稀土合金的烟气试验研究进行了论述.评细介绍了吸附剂、工艺流程、净化原理,重点介绍了该项技术的除氟效果,同时也简介了系统的除二氧化硫与粉尘的效果.试验表明,该技术可以同时净化烟气中的氟、硫与粉尘,其工艺先进,流程简单,净化效率高.除氟效率大于99%.除二氧化硫效率大于91%,除尘效率大于99%.     

平果铝厂320kA电解烟气净化吸附计算及分析

通过对平果铝业公司GP320电解烟气净化工艺有关参数的计算,定性地分析了目前GP320电解烟气净化存在的问题,提出了进一步改进建议,并对该系统净化效率进行分析研究.     

预焙阳极焙烧炉烟气吸附法净化技术应用

预焙阳极焙烧炉烟气的净化有多种方法,原青铜峡铝厂三期工程焙烧炉烟气净化系统采用干式电捕法。由于烟气达不到排放要求,进行改建为氧化铝吸附法进行烟气净化.主要介绍改建后的烟气净化系统的工作原理、工艺流程、主要设备、控制系统以及烟气净化效果.     

焙烧炉烟气污染防治对策的探讨

分析焙烧炉烟气特征,综述各种焙烧炉烟气的治理技术及实际运行净化效果.提出铝电解阳极焙烧炉烟气的最新治理技术:全蒸发冷却塔加电捕焦油器,氧化铝吸附干法净化技术,以及颗粒层吸附技术炭素焙烧烟气净化中的应用.     

混合加热湿法脱硫净化烟气研究

湿法脱硫低温净化烟气与另一股高温未净化烟气直接混合可达到加热净化烟气的目的。影响混合烟气的因素很多,从未净化烟气和净化烟气的温度、烟气中SO2浓度、脱硫效率等因素对混合后烟气温度和SO2浓度变化的影响进行计算,其结果可为脱硫净化烟气余热设计提供参考依据。     

铝用炭素阳极焙烧烟气净化控制系统设计与应用

针对铝用炭素阳极焙烧炉有害烟气净化不彻底的问题,开展了烟气净化系统的设计及应用研究。通过对烟气净化控制系统的总体框架设计,进行了采集端与信号收集端的连接,引进排放在线监测系统,与PID形成自动调节,在现场实现氧化铝的自动投放,对除尘后的烟气进行信号采集,以计算机语言的形式进行输出,将输出数据与设定参数范围进行对比,判定系统对焙烧后气体的净化程度。     

碱金属在烧结过程中的特性

烧结混合料中碱金属的存在,对高炉操作及烧结厂烟气净化均有重大影响。为了弄清碱金属在烧结过程中的特性,通过碱金属的氯化焙烧而进行了基本试验研究。     

电解槽烟气实施干法净化综合节能治理

本文简述了我国即将淘汰的自焙槽烟气状况、改造的有效途径，以及中铝河南分公司电解厂采用逆向二段干法烟气净化新技术进行综合节能治理，在工业试验及正常运行中所取得的成绩。     

不同含钒品位石煤常压酸浸

对不同含钒品位石煤,采用H2SO4和HF按比例混合,反应过程加入NaClO的常压直接酸浸方法。在可行性实验基础上,考察了反应时间、反应温度、H2SO4用量、反应液固比、HF用量、NaClO用量等参数对钒浸出率的影响,比较了各参数对钒浸出率影响的规律性。结果表明:钒的赋存状态对浸出影响很大,四价、五价钒含量越多越易浸出,选择最佳工艺参数进行实验钒的浸出率不低于85%。实验均采用一段浸出,既缩短了工艺流程又降低了成本。     

Development of a Sulfamic Acid-Based Chemical Formulation for Effective Cleaning of Modified 9Cr–1Mo Steel Steam Generator Tubes

A new sulfamic acid-based formulation is developed for the effective chemical cleaning of modified 9Cr–1Mo steel as a replacement for the conventional corrosive nitric acid (HNO3) and hydrofluoric acid (HF) mixture. The effect of sulfamic acid concentrations and inhibitor (2-mercaptobenzimidazole, MBI) on the metal loss during cleaning of modified 9Cr–1Mo steel was studied using weight loss and electrochemical impedance spectroscopic methods. The metal loss was found to increase with increase in acid concentration, but it was significantly lower with increasing inhibitor concentration, with an efficiency of > 90%. The corrosion rates of modified 9Cr–1Mo steel with 10% sulfamic acid + 2 mM MBI, 10% sulfamic acid without inhibitor and HNO3 + HF mixture were 1290, 6426, and 303,515 μm year−1 respectively. The optimal composition for efficient cleaning, with least base metal loss, was found to be 10% sulfamic acid + 2 mM MBI. Laser Raman spectroscopic (LRS) analysis of the corrosion products obtained during chemical cleaning process revealed that a protective chromium oxide film was formed during the cleaning with sulfamic acid + inhibitor as compared to iron oxide-based films with HNO3 + HF mixture and 10% sulfamic acid solutions.     

有机胺吸附解吸工艺在烧结烟气脱硫中的应用

莱钢4#265m2烧结机烧结烟气脱硫系统采用有机胺吸附解吸工艺,系统由烟气净化及SO2吸收、吸附液再生、胺吸附液过滤净化等工序组成,通过从环冷机引出废热,经再沸器后排放,解决了烟气温度低且波动大的问题;增加除氯站,除去吸收剂中富集的氯离子;采用自清洗空气过滤器等保证产品酸的品质。改进后系统运行稳定,烟气入口SO2含量<1300mg/m3,出口SO2含量<100mg/m3,脱硫率>92%。     

耐HF酸胶泥在冶炼制酸空塔上的应用

介绍了耐HF酸胶泥的性能及其在有色冶炼厂烟气制酸净化工段空塔上的应用实例。     

除氟脱硫工艺技术的选择

烧结生产工艺过程中产生的SO2、HF有害气体需经净化方能排放。除氟脱硫技术方法有湿法、半干法。本文就除氟脱硫技术原理、工艺流程、副产物应用、效果以及在冶金行业的应用进行分析与探讨。     

铜冶炼工艺环境集烟的活性焦脱硫技术介绍

采用可资源化干法错流移动床活性焦烟气净化工艺对环境集烟中的SO2进行净化处理。系统脱硫效率达93%以上,同步除尘效率达68%以上,吸附饱和后的活性焦加热再生后循环使用。解吸气中SO2浓度高,用于生产硫酸,可有效回收硫资源。整套工艺基本不耗水,无二次污染。结果表明,活性焦烟气净化装置操作简单,运行稳定,具有良好的经济效益,有利于实现可持续发展。     

Nutritional aspects of hydrogenated and regular soybean oil added to diets of broiler chickens

The objective of the present study was to evaluate the effect of degree of saturation of fat incorporated into broiler diets on performance and body fatty acid (FA) profile. The various degrees of saturation were achieved by using regular soybean oil (SO) and hydrogenated soybean oil (HSO), mixed at different proportions. The work was carried out on commercial broilers (Experiment 1) and on lines of chickens divergently selected for high (HF) or low (LF) abdominal fat (Experiment 2). Daily BW gain and gain:feed ratio increased and the amount of feed intake decreased as the dietary fat saturation decreased. Digestibility of total fat and of each of the FA was lowest in the HSO group and reached maximal values when 23% or more of the added oil was SO. The AMEn values of the diets were almost parallel to fat digestibility. The performance of the HF and LF chickens was affected by the degree of saturation similarly to that observed for the commercial stock. The degree of dietary fat saturation had very little effect on saturated FA (C16:0 and C18:0) in body lipids, reduced the level of monoenoic FA (C16:1 and C18:1), and raised that of polyunsaturated FA (PUFA) (C18:2, C18:3, and C20:4). Monoenoic FA were higher, whereas PUFA were lower in the HF than in the LF line. The improved AMEn in diets containing unsaturated fat is probably due to higher fat digestibility, direct deposition of PUFA in body lipids, and lower lipogenesis, associated with lower heat production.     

氢氟酸在硅酸盐矿物浮选中的作用机制

研究了氢氟酸（HF）在油酸钠浮选体系中对五类结构九种硅酸盐矿物的调整作用．通过矿物ξ-电位和X光电子能潜（XPS）的测定,以矿物晶体化学特征和表面特性为依据．分析了氢氟酸在硅酸盐矿物浮选中的作用机理．并着重探讨了HF对石英和绿柱石的活化作用．结果表明,氢氨酸对硅酸盐矿物的调整作用与矿物的晶体化学特征具有密切的关系,HF对矿物表面的清洗作用,溶蚀矿物表面硅酸及在矿物表面Al3 形成铝氟络合物,使矿物表面性质发生改变．是氢氟酸调整作用的主要机理．     

Flotation of Metallurgical Grade Silicon and Silicon Metal from Slag by Selective Hydrogen Fluoride-Assisted Flotation

Flotation experiments performed on metallurgical grade silicon have demonstrated that silicon (Si) can be floated in diluted solutions of hydrogen fluoride (HF) and a frother. The recovery was found to depend on HF conditioning time, frother type, and the concentration of both HF and frother. Although Brij 58 produced the highest recoveries of the frothers that was tested, good recoveries were also obtained for Flotanol C07. Chemical analyses showed that the flotation products were purer than the corresponding feed materials, and that most impurity elements were concentrated in the tailings. A case study on cleaning of slag containing 36 pct metallurgical silicon showed promising results concerning the recovery of silicon by flotation.     

不锈钢酸洗废水蒸酸研究

针对目前不锈钢酸洗废水处理技术的欠缺,对蒸发法处理不锈钢酸洗废水回收馏出液,并从浓缩后的剩余废液中回收有价金属元素的工艺进行了研究。探索了不同硫酸加入量条件下,酸洗废液中硝酸和氢氟酸的逸出规律。研究表明,硫酸的加入能明显提高氢氟酸和硝酸的蒸出效果,合理的硫酸加入量为10%左右。蒸酸后残液中的镍、铬、铁等有价金属元素含量可提高一倍以上,为其综合利用奠定了基础。