某含砷浮选金精矿的细菌氧化预处理-氰化提金试验研究

云南省某含砷难浸金精矿，常规氰化金浸出率仅为26．17％，通过采用细菌氧化预处理后，金浸出率达到98．25％，获得了非常理想的试验指标。     

高浓度焦化废水的预氧化-混凝处理研究

焦化废水成分十分复杂,污染物浓度高,性质非常稳定且水量大,是典型的难降解有机废水。使用H2O2为氧化剂,FeSO4.7H2O为催化剂的Fenton氧化法对钢铁焦化厂废水的终冷水进行了试验研究,氧化处理后用FeCl3为混凝剂对COD,NH3-N,色度及浊度的去除率进行了系统的考查。确定了氧化反应的影响因素和最佳的混凝实验条件。结果表明:当pH值控制在3左右,反应时间为30 min,反应温度为80℃,焦化废水的COD,NH3-N,浊度和色度去除率分别达到了93.1%,96.2%,90.8%和90.2%。     

高锰酸盐复合药剂预氧化处理微污染水

通过生产性试验考察了高锰酸盐复合药剂预氧化处理微污染水的除污染效能.结果表明,高锰酸盐复合药剂预氧化强化了对浊度、有机物及铁、锰等污染物质的去除,并且与常规工艺相比能较好地控制出厂水三卤甲烷的生成量.     

Corrosion behavior of Fe-20Cr and Ni-20Cr alloys in Ar-H2O-HBr gas mixtures at 1000 K

Discontinuous mass-change measurements and corrosion-product analyses were made for Fe-20Cr and Ni-20Cr alloys after exposing them to Ar-H ₂ O-HBr gas mixtures at 1000 K for 24 hours. Predominantly chromia scales formed on both alloys. Upon cooling, the scales remained adherent to the Fe-20Cr alloy but spalled extensively from Ni-20Cr samples. After tests in HBr-rich gas mixtures, bromine-rich corrosion products were found underneath chromia scales on both alloys while nickel evaporation was observed from Ni-20Cr samples. Preoxidation of the Ni-20Cr alloy prior to exposure to Ar-H ₂ O-HBr gas mixtures increased chromia scale adherence but did not prevent nickel loss from the alloy. Chromia scales formed on the Fe-20Cr alloy were more protective due to the absence of iron oxides in the scale. Large NiO crystals formed over the Ni-20Cr alloy decreased chromia-scale adherence and increased nickel loss from the alloy due to the low stability of NiO in HBr-containing gas mixtures.     

Increasing silver leaching rate from leaching-resistant zinc residues by thiourea leaching method with pressurized preoxidation process

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Erosion—corrosion characteristics of a 2.25 Cr-1 Mo steel exposed at low particle velocities

The erosion-corrosion characteristics of a 2.25 Cr-1 Mo steel at low particle velocities and elevated temperatures were determined using a nozzle type laboratory erosion tester. The tests were performed with 180–360 μm angular alumina particles at 60° angle of impingement at low particle velocities of 2.6–8.2 m/s and in the temperature interval 20–600°C. The steel was tested both in the as-received condition as well as in two preoxidized conditions. The erosion-corrosion rate of the steel, both in the as-received and in the preoxidized conditions, was found to increase with increasing particle velocity. In contrast, the wastage rates were relatively independent of temperature in the temperature range investigated, the only exception being specimens exposed to the lowest particle velocity (2.6 m/s) at the very highest temperature, i.e. 600°C, which displayed a drastic increase in wastage. Specimens preoxidized at 700°C exhibited a somewhat higher erosion rate compared with non-preoxidized specimens and specimens preoxidized at 500°C. Microscopy revealed four different major wastage mechanisms, i.e. (i) plastic deformation, cracking and micro chipping of surface material of a size corresponding to the area impinged by eroding particles, (ii) chipping of somewhat larger oxide fragments (up to 10–15 μm in diameter), (iii) chipping or spalling of relatively large oxide fragments (up to 30–50 μm in diameter), and (iv) spalling along the steel-oxide interface or within an oxide layer due to cohesive failure, of larger (up to 500 μm in diameter) oxide layer fragments. In the present study extensive spalling was only observed for non-preoxidized specimens exposed to the lowest particle velocity (2.6 m/s) and the two highest specimen temperatures (550°C and 600°C).     

预氧化化学强化混凝在污水处理中的试验研究

通过采用氧化剂预氧化强化混凝方法处理市政污水的试验研究,证实预氧化化学强化一级处理法可以有效的除去水体中悬浮物、COD、总磷,对水体中NH3-N也有明显的去除作用。经过多种常规药剂筛选,确定采用NaClO和S-8000A进行处理效果最佳,并对其工艺条件进行了试验研究,确定最佳pH值和反应时间。     

一种新型碳纤维预氧化技术及其设备——美国DESPATCH公司CTE技术介绍

介绍了目前世界流行的3种碳纤维预氧化技术：侧吹风、垂直吹风和中央到两端吹风（CTE）技术，详述了DESPATCH公司CTE预氧化技术，实验过程和结果表明：预氧化炉右侧含氧量普遍偏高，通过进一步调整右侧的温度，可以把含氧量的均匀度调整得更好；CTE技术比侧吹风技术的预氧化效率高25％以上。     

氧化预处理对焦化蜡油催化裂化的影响

 在高压反应釜中，使用高锰酸钾(KMnO₄)对克拉玛依焦化蜡油(KLCGO)进行氧化预处理。分别采用蒸气压渗透法(VPO)和傅里叶转换红外光谱(FT-IR)，分析了KMnO₄氧化预处理前后平均相对分子质量和官能团的变化，并在模拟固定床催化裂化(FCC)微反装置上评价了其催化裂化性能。结果表明，KMnO₄氧化预处理KLCGO，产生了新的含氧官能团，KLCGO的平均相对分子质量由300下降至250左右。KMnO₄氧化预处理同时也改善了KLCGO的催化裂化性能，使反应的总转化率增加3.33%，轻油收率增加7.73%，而干气和焦炭的产率可分别降低0.52%和1.08%。适宜的KMnO₄氧化预处理用量为1500μg/g。     

臭氧预氧化强化混凝处理引黄水库水的中试研究

针对引黄水库水的特点,采用臭氧预氧化强化常规工艺处理引黄水库水。中试研究结果表明:臭氧预氧化能够降低常规工艺出水浊度,改善对有机物的去除效果,同时提高常规工艺对氨氮和藻类的去除率。适宜的臭氧投加量为1～2mg/L,当臭氧投加量为1mg/L时,臭氧预氧化后,滤后水浊度、CODMn、UV254、氨氮和叶绿素a的去除率,与常规工艺相比分别提高了2.7,2.5,7.8,5.2和4.8个百分点。