高掺量矿渣水泥粉磨节能新工艺的探索

矿渣已成为水泥的一种重要混合材，但矿渣的易磨性很差，因此选择适当的工艺显得尤为重要。对共同粉磨、分别粉磨、混合粉磨以及基于辊压机的联合粉磨工艺分别做了分析比较，认为采用辊压机对矿渣进行预粉磨能够提高水泥质量，节约能源，同时，预粉磨系统中分级设备的选择也很重要。     

Inferring the distribution of iron oxidation species on mineral surfaces during grinding of base metal sulphides

Electrochemistry plays an important role in the flotation of base metal sulphide minerals. During grinding a galvanic interaction occurs between minerals and grinding media and controls the iron contamination on mineral surfaces, which depresses mineral flotation significantly. In this study, the galvanic interaction was quantified by measuring the iron oxidation species originated from grinding media by ethylene diamine-tetra acid (EDTA) extraction in single mineral and mixed mineral systems. It was found that the extent of galvanic interaction between minerals and grinding media was intimately associated with the electrochemical reactivity of minerals. The nobler the mineral, the stronger the galvanic interaction with grinding media, and the higher the amount of iron oxidation species from grinding media. For both galena and chalcopyrite a linear relationship was observed between the amount of iron oxidation species and flotation recovery in single mineral systems. This relationship was able to predict the iron oxidation species on galena and chalcopyrite surfaces when they were mixed with pyrite separately. The distribution of iron oxidation species onto the two minerals in the mixture changed with the ratio of the mineral surface areas and was correlated with mineral flotation recovery. The major cathodic mineral in the mixture was dictated by the combination of mineral surface area and reactivity and drew iron oxidation species from the grinding media.     

贵州织金新华磷矿磨矿细度的实验研究

通过对贵州织金新华磷矿磨矿细度的实验研究,分析了磨矿时间对磨矿细度的影响。实验结果表明:磨矿时间短,磨矿细度小,随着磨矿时间的延长,磨矿细度增加;根据浮选实验确定,磨矿的最佳时间为7min,磨矿细度为87.35%;磨好的矿样经充分混合取样分析表明,矿样P_2O_5含量为21.90%,MgO的含量为6.42%,稀土含量为0.0861%。     

白土矿物超细磨中助磨剂的研究

对某地白土矿超细磨助磨剂的研究结果表明，四种表面活性剂的助磨效果顺序是石油磺酸钠＞ＴＦ２７９＞三乙醇胺＞油酸钠。当石油磺酸钠用量为０．１５５％时，其－５００目产率可由７６．５％提高到８４．９％，增量为８．４％。ＮａＯＨ、Ｎａ２ＣＯ３和六偏磷酸钠三种无机盐对白土矿物亦有一定的助磨效果，当碳酸钠加入量为０．１５％时，其－５００目产率增加了７．４％。助磨剂能明显提高粉磨效率。     

助磨剂对水泥需水量影响分析

本文对影响水泥需水量的主要因素进行了分析,主要有:熟料矿物组成、混合材的种类与用量、石膏种类、碱含量、水泥颗粒分布等.并通过直接掺加法研究了助磨剂对水泥需水量的影响,结果表明,水泥的需水量与助磨剂没有直接的关系,但是因为使用助磨剂会改变水泥的颗粒级配、增加水泥混合材用量等,会间接影响水泥的需水量.     

Verbesserung der Löslichkeit von Pektinsäure durch Schwingmahlabbau

Vibration grinding of high-molecular pectic acid results in preparations of nearly constant composition and decreased average molecular weight in dependence of grinding time. By using this favourable procedure it is generally possible to produce standardized pectic acid preparations with better and more reproducible solubility properties. Such preparations are required, e.g., for comparative enzymatic investigations. For evaluating polygalacturonase activity it is proposed to use pectic acid preparations with the following properties: viscosity number [η] (intrinsic viscosity) in the range of 50–100 ml/g, mineral content lower than 1 %, and anhydrogalacturonic acid content in the ash-free dry substance minimum 80 %.     

炼焦煤粒度调整技术

分析了粒度对炼焦煤结焦性影响的研究进展,结合煤料显微组分特征、成焦机理等,介绍了粒度对煤料结焦性影响的主要研究方法。分析了原料煤粉碎粒度和焦炭质量的相关性,指出应充分利用煤料破碎后显微组分含量与粒度的关系。对煤料按粒度大小进行选择性利用,可以提高煤炭的利用率。超细粉碎灰分较高的煤料,可以使煤中无机物和有机物有效分离,提高选煤过程中的精煤产率,扩大炼焦煤源。但直接利用超细粒度煤料炼焦,可能会增加装炉操作压力、降低煤料黏结性。     

水泥与外加剂相容性差的原因分析及解决措施

水泥与外加剂相容性的影响因素众多,如熟料矿物组成、粉磨工艺、水泥细度、混合材种类等.本文结合本公司的实际问题,分析了水泥与外加剂相容性差的原因,提出了相应的解决措施.结果表明,从改善熟料矿物组成和提高熟料烧成质量入手,可改善水泥与外加剂的相容性,效果显著.     

Corex矿渣和高炉矿渣配制水泥的性能对比

Corex矿渣和高炉矿渣是不同原材料，不同工艺制度下获得的矿渣，具有不同的特性。与高炉矿渣相比，Corex矿渣具有更高的碱度，更高的非晶态含量，在同样粉磨细度时，配制水泥的强度较高。     

助磨剂及其在水泥生产中的节能降耗作用

助磨剂能够改善粉磨条件,提高粉磨效率,降低粉磨能耗,优化水泥颗粒级配,增加水泥的强度,减少粉尘和CO2排放,提高水泥中混合材料的掺量,降低生产成本,从而得到了广泛的应用。文章介绍了助磨剂的助磨机理,分析和探讨其在水泥粉磨中的效果及期影响因素;并结合工程应用实践,重点阐述了助磨剂在水泥生产中的节能降耗作用。     

助磨剂的助磨作用及对粉体流变性能的影响

选用五种助磨剂，对四种有代表性的物料进行了助磨实验，同时测试了磨后物料粉体的流变特性。分析了助磨效能、粉体流变性能和助磨机理三者的关系。研究结果显示：当助磨剂使粉体的流动性增强、堆积密度增大时，助磨效果趋于增强     

The relationship between excluded mineral matter and the abrasion index of a coal

Predictions of the wear rates of components in grinding mills at pulverised coal-fired power stations are currently made using empirical relationships based on the ash content of the coals. However, modern coal characterisation techniques now allow the mineral inclusions in a coal that are responsible for the abrasive nature of the coal to be accurately characterised. Hence, there is scope to make improved predictions of wear based on a detailed knowledge of the mineral matter in a particular coal. It is first necessary, however, to understand the nature of the minerals and properties of the minerals in a coal that would contribute to abrasive wear. In this study known quantities of quartz, pyrite and slate have been added to a washed coal and the Abrasion Indices of the coal/mineral mixtures have been measured. The results show how the size, shape and hardness of excluded mineral matter contribute to the abrasive properties of a coal.     

基于改进DOB的矿物研磨过程最优运行先进反馈控制(英文)

Advanced feedback control for optimal operation of mineral grinding process is usually based on the model predictive control (MPC) dynamic optimization. Since the MPC does not handle disturbances directly by controller design, it cannot achieve satisfactory effects in controlling complex grinding processes in the presence of strong disturbances and large uncertainties. In this paper, an improved disturbance observer (DOB) based MPC advanced feedback control is proposed to control the multivariable grinding operation. The improved DOB is based on the optimal achievable H 2 performance and can deal with disturbance observation for the nonminimum-phase delay systems. In this DOB-MPC advanced feedback control, the higher-level optimizer computes the optimal operation points by maximize the profit function and passes them to the MPC level. The MPC acts as a presetting controller and is employed to generate proper pre-setpoint for the lower-level basic feedback control system. The DOB acts as a compensator and improves the operation performance by dynamically compensating the setpoints for the basic control system according to the observed various disturbances and plant uncertainties. Several simulations are performed to demonstrate the proposed control method for grinding process operation.     

The nature of mineral matter in a coal and the effects on erosive and abrasive behaviour

The Yancey, Geer and Price (YGP) abrasion index has been used for many years to assess the abrasive nature of a coal. The index is clearly related to the mineral matter in the coal, but a direct correlation with the ash content is poor. A better correlation is achieved by relating the wear of coal grinding mills and pf pipe work to the quartz and pyrite contents of the coals, but the data still shows significant scatter and is of limited use for predicting component wear rates. This paper presents the results of a study aimed at relating the nature of the mineral matter in a range of UK and world-traded coals with their abrasive and erosive wear as measured by the Mitsui Babcock mini-mill test and pulverised coal erosion studies. The mineral matter in the coals has been characterised by computer controlled scanning electron microscopy (CCSEM). The results from the mini-mill and erosion tests have given linear correlations between the mineral matter in the coal and the abrasive and erosive wear by considering only the excluded mineral occurrences in the pulverised coal that that are harder than steel and have a size that is >25 μm.     

纤维状坡缕石磨矿工艺试验研究

坡缕石是一种层链状含水镁质硅酸盐矿物,属世界稀缺的矿产资源.由于坡缕石的难磨属性大大限制了其工业化开发应用进程,本文通过实验室型试验,研究了干式细磨贵州大方纤维状坡缕石的磨矿工艺,表明在舍有一定杂质的情况下,本文制定的磨矿工艺流程对纤维状坡缕石的磨矿是可行的.     

龙游灵山硫铁矿矿床地质与选矿研究

灵山矿区的地质特征和各种类型矿石的选矿结果有密切关系。该矿区黄铁矿可浮性好,而混合带矿石的铜、铅、锌选别分离难度大。因此应采用以回收硫为主,铜硫矿石、锌硫矿石分采分选的原则流程。细磨是提高精矿质量、降低其中杂质的关键措施。     

磨矿细度对胶磷矿浮选精矿产率和P2O5回收率的影响

通过对不同类型胶磷矿进行的磨矿细度试验研究表明,在一定选矿指标下,细磨有利于磷矿物与脉石矿物单体充分解离,提高精矿中杂质的排出率,有利于提高精矿回收率。对滇池周边矿区的中低品位胶磷矿(w(P2O5)≤22%),最适宜的磨矿细度是粒径小于0.038 mm的物料占76.2%以上,或粒径小于0.074 mm的物料占93%以上。     

Cutting edge damage in grinding of cemented carbides micro end mills

Micro mills are widely applied in the micro manufacturing and mainly fabricated using the grinding method. Cutting edges have significant influences on the performance of micro mills such as the micro mill life and machining quality. In this paper, the cutting edge damage mechanisms in the grinding of cemented carbides micro mills are investigated. The micro end mills grinding experiments are carried out and the cutting edge maximum edge damage width and surface roughness of the end teeth flank are measured. The results show that the micro fractures and micro cracks are generated in the cutting edge following micro pits in the grinding surface. The grain size and composition of cemented carbides have significant impacts on the damage of the cutting edge. The maximum edge damage width increases with the increase of Co binder content and WC grain sizes. However, a better flank quality with less micro pits is obtained as the reduction of Co binder content and grain size of WC.     

热处理对峨眉山玄武岩易磨性与微观结构的影响

在对峨眉山玄武岩的矿物组成及其基本物性进行分析的基础上,研究了煅烧温度对玄武岩物料易磨性、粉体粒度分布等性能的影响,并借助SEM、XRD等测试手段分析了其微观结构的变化。结果表明,随着热处理温度的升高,该玄武岩的易磨性得到明显改善,1050℃煅烧试样较未煅烧试样而言,其粉磨功指数由36．60kWM下降到24．13kWh／t,降幅达到34．15％,成品试样中细粉含量显著增加,〈56μm的颗粒含量增加近20％。     

Grinding kinetics of calcined alumina

Conclusions If it is necessary to obtain a mineral powder with a high dispersion (_mean 1 ), it is technically-undesirable and economically unsuitable to increase the quantity of grinding bodies by more than four times with respect to the weight of -Al₂O₃.Silicone oil is a suitable surface active agent for carrying out effective dry grinding of -Al₂O₃.With the dry grinding of -Al₂O₃ using metal grinding bodies, the iron pickup is approximately ten times greater than with wet grinding. During the dry grinding of -Al₂O₃ with an addition of silicone oil, and corundum grinding bodies, the rate of grinding is the same as with wet grinding using metal grinding bodies.Translated from Ogneupory, No. 8, pp. 71–72, August, 1971.