淮南矿业集团顾桥电厂混煤配煤方案研究

淮南矿业集团顾桥电厂工程建设规模为2×300MW级亚临界一次再热CFB锅炉,燃用煤矸石、煤泥和洗中煤混煤,采用普通带式输送机将煤矸石和洗中煤直接送到厂内混煤筒仓,采用普通带式输送机将煤泥输送到煤泥泵房制浆。本文将目前电厂常用的混煤方式进行了对比,对煤矸石电厂适用的混煤方式提出了建议。     

Effect of chlorite on the flotation of pyrrhotite and its implications for elimination by different methods

The effect of chlorite on the flotation of pyrrhotite was systematically investigated through flotation tests, adsorption studies, optical microscopy experiments, inductively coupled plasma emission spectrometer tests, zeta potential measurements, and X-ray photoelectron spectroscopy analysis. Results showed that fine chlorite impaired the flotation of pyrrhotite due to slime coating. To eliminate the adverse effect of chlorite, two different methods were employed. Carboxymethyl cellulose and quartz could remove the slime coating of chlorite and improve the flotation recovery of pyrrhotite, whereas the addition of quartz provided better results. The key to eliminating the adverse effect of chlorite on the flotation of pyrrhotite is to remove the slime coating of chlorite by changing the surface charge of chlorite.     

改性粉煤灰絮凝剂的制备及处理煤泥水的研究

通过亲水性单体的表面接枝聚合改善粉煤灰的表面亲水性,增加与水的接触,从而提高其净化污水效果。将粉煤灰分散在甲基丙烯酸溶液中聚合,制备聚甲基丙烯酸改性粉煤灰絮凝剂,然后对吸水率、红外、热重和SEM进行表征,并通过煤泥水的沉淀试验对絮凝能力进行研究。结果表明,该方法将甲基丙烯酸接枝聚合在粉煤灰表面制备FA-MA20絮凝剂,可以改善粉煤灰的亲水性,对煤泥水具有良好的絮凝能力。通过改善粉煤灰表面亲水性的方法可以提高对煤泥水的净化效果,对粉煤灰的综合利用及煤泥水处理具有重要的应用前景。     

TBS分选机在王家岭选煤厂的应用

阐述了TBS分选机的工作原理和技术参数。分析了两种TBS分选机入料及产物的粒度和密度组成,对比了两种TBS分选机的分选精度。结果表明:两种TBS分选机的入料粒度组成类似,0.2~1.0 mm质量分数大于60%,属主导粒级,适合采用TBS分选机分选,其精煤灰分均小于10%,尾煤灰分均高于57%,分选效果较好。当精煤灰分为9.50%时,两种TBS分选机的入料煤样均属易选煤。两种TBS分选机的Ep值分别为0.178和0.183,I值分别为0.239和0.246,分选效果基本相同,均达到较高水平,分选下限达到0.2 mm。     

煤泥水浓度偏高原因分析及处理技术

煤泥水浓度是影响脱介效果和精煤产品质量的重要因素,在指导分选生产中起着重要作用。以山西焦煤西山煤电屯兰选煤厂煤泥水浓度偏高情况为例,分析了高频筛回收效果差、絮凝剂添加不科学、浓缩机溢流大、重介系统筛板、筛篮跑粗等因素是影响煤泥水浓度偏大的主要原因。针对上述问题提出控制浓缩机溢流电流在280~310 A,絮凝剂配制成0.1%溶液;降低设备底煤厚度等技术方案。改造后,选煤厂煤泥水质量浓度低于13 g/L,提高产品产率,实现节能降耗,提高选煤厂的效率。     

煤泥水磁化改性及磁化-絮凝沉降研究

为研究磁化作用对煤泥颗粒同种表面电荷(ζ电位)及表面水化膜的影响,以磁场强度和磁化时间为变量对煤泥水进行磁化处理试验。采用自然沉降、絮凝沉降、混凝沉降和预磁化-絮凝沉降等方法对煤泥水进行沉降处理,分析沉降特性,揭示煤泥水磁化处理作用机理。结果表明,在0.15~0.25 T磁场下预磁化2~3 min时,煤泥颗粒的ζ电位由30.5 me V降至20.1 me V,煤泥颗粒的表面水化膜明显减薄。混凝沉降与预磁化-絮凝沉降的沉降速度、尾泥高度均明显优于单纯的絮凝沉降,而预磁化-絮凝沉降在沉降速度、上清液透光率、尾泥高度等方面又优于混凝沉降,尾泥高度减少25%,煤泥水透光率达到82.2%。     

煤泥离心过滤和机械压滤的滤饼层粒度分布及其影响

针对离心过滤和机械压滤过程中煤粒成饼机理的差异,采用分层取样法分析对比了煤泥离心过滤与机械压滤两种不同过滤方式形成的滤饼内部的粒度及水分分布特点,基于沉降理论探讨了离心过滤和机械压滤的成饼过程,并分析了入料级配对离心过滤过程中滤饼粒度分布的影响。结果表明:机械压滤形成的滤饼中,颗粒粒度和滤饼水分沿滤饼厚度的方向无显著变化,而离心过滤形成的滤饼中,颗粒粒度和滤饼水分沿滤饼厚度的方向存在较大变化,距离滤网越近,滤饼层颗粒的平均粒度越粗、水分越低;入料级配对离心过滤的滤饼层粒度的径向分布及脱水效果影响显著,随着入料平均粒度的减小,上述径向分布差异呈现缩小的趋势;沿着滤饼厚度的方向,压滤滤饼中的过滤比阻分布是相对均匀的,在理论分析中可近似为常数,而离心过滤的滤饼层的过滤比阻分布具有非均匀性,影响比阻分布的因素具有复杂性。     

从富银渣中回收银的方法研究

本文通过试验,研究了从铜阳极泥富银渣中回收银的一些方法,并对其优缺点进行了比较,提出了水合肼还原法是目前制取粉末冶金用纯银粉的一种很有前任的方法。     

Are motorways rational from slime mould's point of view?

We analyse the results of our experimental laboratory approximation of motorway networks with slime mould Physarum polycephalum. Motorway networks of 14 geographical areas are considered: Australia, Africa, Belgium, Brazil, Canada, China, Germany, Iberia, Italy, Malaysia, Mexico, the Netherlands, UK and USA. For each geographical entity, we represented major urban areas by oat flakes and inoculated the slime mould in a capital. After slime mould spanned all urban areas with a network of its protoplasmic tubes, we extracted a generalised Physarum graph from the network and compared the graphs with an abstract motorway graph using most common measures. The measures employed are the number of independent cycles, cohesion, shortest paths lengths, diameter, the Harary index and the Randi? index. We obtained a series of intriguing results, and found that the slime mould approximates best of all the motorway graphs of Belgium, Canada and China, and that for all entities studied the best match between Physarum and motorway graphs is detected by the Randi? index (molecular branching index).     

电解金属锰阳极泥回收制备化学二氧化锰工艺研究

对电解金属锰阳极泥的性质进行了初步分析,提出了一种将其制备成化学二氧化锰的煅烧氧化法工艺,并对该工艺相关的影响因素进行了研究分析.通过最佳条件实验,制得了视比重为1.61 g/cm^3,以γ-MnO2为主的初级化学二氧化锰.如将其进一步精制,可以作为电池级的化学二氧化锰应用.研究表明采用煅烧氧化法将锰阳极泥回收制备成化学二氧化锰的路线是可行的.