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。     

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。     

铝用炭素生产过程余热利用技术及工程实例

本文实际调研了某炭素厂的能量流向,考核其热平衡,结果表明:生产过程的主要热支出项为煅烧过程的冷却循环水带走的热量与煅烧烟气带走的热量,分别占总能量支出的14.37％和25.28％,焙烧过程的高温固体带走热占总能量支出的28.27％.该炭素厂已对高温煅烧烟气余热进行了利用,其中采取余热发电方式回收的余热每天可发电70,0...     

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。     

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.     

Influence of hydrothermal treatment temperature on oxidation modification of C/C composites with aluminum phosphates solution by a microwave hydrothermal process

Carbon/carbon (C/C) composites were modified with an aluminum phosphates solution by a novel microwave hydrothermal (MH) process in order to improve their low temperature oxidation resistance. Results show that a H₃PO₄ or HPO₃ continuous molten layer with some regular, white cubic Al(PO₃)₃ crystallites are obtained on the surface of the modified composites. The anti-oxidation property of the composites after modification improves with the increase of the MH temperature from 393 to 473 K. The oxidation rate is almost constant after oxidation at 873 K for 6 h. The formation of annular structure of Al(PO₃)₃ is helpful to improve the oxidation resistance of the composites.     

化学法浸出废旧铝电解槽内衬回收冰晶石和碳粉(英文)

采用两步浸出法对铝电解槽废旧阴极炭块进行处理,以分离出冰晶石并提纯炭粉。研究不同温度、浸出时间和液固比对浸出率的影响。结果表明,在NaOH浸出阶段,可溶性化合物Na3AlF6和Al2O3溶解于NaOH溶液中,浸出率达到65.0%,所得炭粉纯度为72.7%;第二步采用HCl浸出得到炭粉,可溶性化合物CaF2和NaAl11O17溶解到盐酸溶液中,浸出率达到96.2%,炭粉纯度达到96.4%。将上述碱浸和酸浸得到的浸出液进行混合以析出冰晶石,在pH=9、温度为70°C下沉积2h,其析出率达到95.6%,所得冰晶石纯度为96.4%。