混凝沉淀-过滤工艺处理选矿废水

针对某企业选矿废水的特性,采用混凝沉淀一过滤工艺对其进行处理,运行结果表明：整个废水处理系统稳定运行期间,CODcr和SS的去除率可达46．4％和97．8%,出水水质各项指标均达到《污水综合排放标准》（GB8978—1996）中的一级排放标准。     

应用改性絮凝剂加速镍铜精矿矿浆沉降及过滤速度的试验

介绍了不同种类的镍铜精矿矿浆加入适量改性絮凝剂后的沉降及过滤效果,描述了该药剂的作用机理。     

系统过滤-现代化设备高效、低耗和安全运行的关键

系统过滤是液压和润滑的主要环节，系统过滤搞好了，液压和润滑系统的故障将显著下降，对设备长期高效、低耗、安全运行起至关重要的作用     

无传动、免维护深锥高效沉降槽处理选矿拜耳法分离赤泥的试验研究

无传动、免维护深锥高效沉降槽是一种新型深锥沉降槽，其处理选矿拜耳法稀释后赤泥浆液的试验研究表明．无传动、免维护深锥高效沉降槽能够满足选矿拜耳法生产处理稀释后赤泥浆液的需要，具有投资建设费用和运行维护成本低，操作控制简单，劳动强度低，占地面积小的优点，对于选矿拜耳法及拜耳法生产具有广阔的应用前景。尤其对生产场地紧张的老厂技改扩建具有重要意义。     

应用选矿-拜耳法工艺处理一水硬铝石型中低品位铝土矿生产氧化铝的工业实践

论述选矿拜耳法生产氧化铝的工艺过程,对技术指标进行分析,总结生产实践得失,为选矿拜耳法新技术的普遍应用,优化过程指标,提高经济效苴提供借鉴。着重讨论了铝土矿选矿过程、选精矿溶出过程、赤泥沉降过程以及浮选药剂对生产的影响和改进。本文指出,应用选矿拜耳法可以经济地处理一水硬铝石型铝土矿,其生产流程简单．技术先进可靠,对低品位一水硬铝石型铝土矿资源经济有效地利用有开创性贡献。值得推广。     

固溶、时效、深冷处理对QAl9-4铝青铜组织及性能的影响

为改善QAl9-4铝青铜的使用性能,对挤压态QAl9-4铝青铜采用固溶、时效、深冷的热处理工艺,利用布氏硬度、SEM、EDS、光学显微镜等手段分析QAl9-4铝青铜处理前后的显微组织和硬度的变化。结果表明:随着固溶温度的升高,硬度增大,随着时效、深冷次数的增加,布氏硬度略有升高;随着固溶温度的升高,时效、深冷次数的增加,QAl9-4铝青铜显微组织中α固溶体、α+KⅡ共析体增多,β'相减少,晶粒细化,金属基体尺寸更加稳定。在950℃固溶后进行时效+深冷+时效+深冷处理,QAl9-4铝青铜的显微组织和硬度都比较理想。     

氧化铝生产废水处理工艺的探讨

氧化铝生产废水处理工艺目前还没有一个统一的意见．国内几家氧化铝厂生产工艺稍有不同．但废水量．处理工艺各不一样,因此。氧化铝行业需要研究氧化铝生产废水的处理流程。本文分析了氧化铝生产废水的特性．结合山西铝厂生产废水的处理实践,推荐氧化铝生产废水采用“调节→平流沉淀→过滤”的物理处理方法为主的工艺流程。     

锌浸渣还原焙烧-磁选回收铁

在查明锌浸渣工艺矿物学的基础上,采用还原焙烧将铁酸锌分解为氧化锌和磁性氧化铁,再通过磁选的方法回收铁,达到锌、铁分离的目的。实验考查了焙烧温度、焙烧时间、还原剂用量对铁酸锌分解率、铁回收率和铁品位的影响。结果表明:在焙烧温度为950℃、焙烧时间为1 h及还原剂添加量为10%和5%的条件下,铁酸锌分解率达到72.05%,铁回收率可达到91.79%,精矿中铁的品位为50%左右。焙烧及磁选过程中颗粒的团聚包裹是铁精矿品位不高的主要原因。     

基于目标情景的中国铝生产碳减排与碳达峰分析

本研究在国家碳达峰目标的指引下,梳理并核算了原铝生产温室气体排放的历史数据,并以此为基础,通过对未来15年中国电解铝生产技术改进潜力、电力结构调整及再生铝产量等因素的预测,建立原铝温室气体排放的多因素分析模型,探究在基准情景(BAU)、低改进效率情景(LIR)和高改进效率(HIR)三种情景下我国原铝生产温室气体减排和碳...     

75kA预焙阳极电解槽"五低一高"先进工艺的生产实践

本文介绍了三门峡天元铝业股份公司通过转变管理理念，优化工艺技术条件，将“五低一高”工艺在60KA改75KA小型预焙阳极电解槽上进行了应用。经过一段时间的摸索，取得了较成熟的经验及良好的技术经济指标，为同类型电解槽工艺技术的管理提供了依据。     

A study on separation of molybdenum from tungsten by an adsorption process using activated carbon

In this paper a new process for separation of molybdenum from tungsten is described. When sodium tungstate solution containing molybdenum is treated with alkali sulfide in the proper condition, the molybdenum is transformed into the thiomolybdate and the tungsten is present as tungstate. When the solution is brought into contact with activated carbon, the molybdenum contained in the solution can be adsorbed quantitatively and the tungsten remaining in the raffinate can be recovered. The new process has advantages such as good results in removing molybdenum, little loss of tungsten and easy operation.     

电解铝厂生产废水处理和回用

通过系统分析电解铝厂生产废水来源、排水特点、排水水质、废水回用的途径等条件,确定了废水处理的工艺方式和设备集成,具有广泛的推广应用价值。     

铝合金/碳钢激光-TIG复合热源熔钎焊工艺与接头显微结构分析

文中提出了一种激光-TIG复合热源熔钎焊新方法,实现了铝合金与碳钢的对接熔钎焊,并研究了焊接工艺对接头特性的影响.采用扫描电镜（SEM）、能谱分析（EDS）和电子材料试验机对接头显微结构与力学性能进行研究.结果表明,接头最大抗拉强度为83.6 MPa,断裂发生在钢/焊缝界面,断裂形式为脆性断裂.钢/焊缝界面不同位置处界面层厚度不同,在3~12 μm之间.界面层由两部分组成,即靠近钢一侧为η-Fe₂Al₅,靠近焊缝一侧为τ₅-Al_7.2Fe₂Si;远离界面层的焊缝区主要由α-Al基体和Al-Si共晶相组成.     

Fe extraction from high-silicon and aluminum cyanide tailings by pretreatment of water leaching before magnetic separation

Pretreatment of high content of Si- and Al-containing cyanide tailings by water leaching to remove some impurities, such as the major impurities minerals of Si and Al, as well as its effect on Fe extraction in the water leaching process was investigated. The effects of different parameters on iron recovery were studied, and the reaction parameters were proposed as follows: sodium carbonate content of 30%, water leaching at 60 °C for 5 min, liquid/solid ratio of 15:1, and exciting current of 2 A. Under these optimal conditions, magnetic concentrate containing 59.11% total iron and a total iron recovery rate of 76.12% was obtained. In addition, the microstructure and phase transformation of the process of water leaching were studied by X-ray powder diffraction technique (XRD), Electronic image of backscattering (BEI), X-ray fluorescence (XRF), and energy dispersive spectrometry (EDS). The results indicate that the soluble compound impurities generated in the roasting process are washed out, and the dissoluble substances enter into nonmagnetic materials by water leaching, realizing the effective separation of impurities and Fe.     

二段脱铜液还原结晶法脱砷新工艺

对铜电解液脱砷方法进行研究,提出以二段脱铜液为原料,采用SO2还原结晶法脱砷新工艺。在二段脱铜液中通入SO2,将其中的As(Ⅴ)还原成As(Ⅲ),还原后的溶液通过蒸发结晶析出As2O3,达到二段脱铜液脱砷的目的。结果表明:当As(Ⅴ)浓度为12.41 g/L、H2SO4浓度为253.00 g/L、反应温度为60℃时,向二段脱铜液中通入SO290 min后静置90 min,二段脱铜液中As(Ⅴ)的还原率达到94.54%。还原后的溶液进行蒸发结晶,当蒸发前与结晶后的体积比(V0:V1)为3.5时,砷的脱除率达到91.33%,结晶产物为As2O3。与传统脱砷工艺相比,新工艺具有操作简单、成本低廉及砷的脱除效果明显等优势。     

Modelling and experimental study of a microforging process from metal strip for the reduction of defects in mass production

Microforming from sheet metals is a technology with high potential and increasing interest in modern factories. The combination of bulk forming technologies in micro-scale together with the easier handling of metal strips allows the high rate production of products with small dimension and is suited for commercial fields like electronics and micromechanics. The need of an efficient FEM aided process design must face the problem of material behavior in microforming, affected by size-effects and not obeying continuum mechanics. A reliable FE model allows the production of a database allowing, additional to process optimization, the design of online process control and the reduction of manufacturing defects, strongly affecting micro-productions because of the high deviations in such processes. In this work, a method for the design of a FEM model of a microforging process is proposed, developed in the commercial software MSC Marc including the modelling of local size effects in the form of variable friction. An increased friction factor is assumed, where typical microforming size effects are expected to take place. Stainless steel and copper-beryllium alloys are studied with the thickness of 300 µm. The microforged geometry consists in 6 parallel protrusions with a width of 200 µm. The experimental study is then performed, by varying punch forces, firstly in a simplified configuration with two protrusions and finally with the complete geometry in a multi-stage microforming process, respectively validating and verifying the developed simulation model.