一掰就碎的水泥符合的哪门子的国家规定?

里能牌水泥不凝固一掰就碎,厂家坚称合格。家住山东济宁的郑先生准备盖房子,这盖房子最重要的原材料就是水泥了,可郑先生说,自己家的这水泥真是水和泥和在一块了。一掰就碎,很不结实。对此,水泥经销商称,他们的水泥符合国家规定,如果有问题也是因为施工的原因。水泥在与沙石加水和成泥浆之后,如果出现不凝固或者不结实的情况,确实是有多方面的原因,比如施工是否严格遵守     

含钛高炉渣综合利用研究现状与展望

含钛高炉渣是典型的大宗工业废弃物,其资源化利用难度高.通过其矿物组成、矿相分布等角度阐述含钛高炉渣综合利用困难的原因,总结了作为建材、复合肥、制砖、制陶瓷等非资源化利用形式,提出直接利用造成钛资源流失等问题,不建议高炉渣的非资源化利用;阐述了二氧化钛富集、酸/碱浸出等湿法、金属热还原法、高温碳还原法、高温硅还原-电磁定...     

废易拉罐再生利用新技术

本文对组成易拉罐罐体的三种不同材质进行了分析，以利于选择最佳工艺路线分别对其回收利用。为了更好地回收铝，在传统的熔铸法的基础上，本文提出了用快速凝固及机械合金化两种新技术制备铝粉。     

成都VS广州千年的距离?

建筑,一首凝固的音乐。 一首用所有的石头和建材筑成的,如雕塑般,如诗歌般,既静态又动感的音乐。 好的艺术是不由亵渎的,更需要读懂它性灵的人。好的建筑更需要仰望,那些思想的碎片、艺术的精华、生活的智慧,藏在片瓦只木中,因为无语,故由人评说。 建筑,代表着一个时代,又常跨越一个时代。它用一个时代的语言和思想来诠释,却在另一个时代得到全新的诠释。每一个时代的评说各有千秋,建筑又白成一格,但千百年过去了,若干个时代变迁了,民族的建筑,却总有一种传承的核心及同质的文化。 犹如一栋栋凝固的音乐史诗,尽管历尽桑田,却独自屹立无言,让历史洗礼。 留给我们的,是无限的注脚……以及更多的仰望。于是,我们期待从仰望建筑开始,解读每一个建筑的心声,通过那个时代的语言,了解我们历史的内核与文化的传承。[编者按]     

仰望建筑--凝固的音乐

建筑,一首凝固的音乐。一首用所有的石头和建材筑成的,如雕塑般,如诗歌般,既静态又动感的音乐。好的艺术是不由得亵渎的,更需要读懂它性灵的人。好的建筑更是我们是需要仰望的,那些思想的碎片、艺术的精华、生活的智慧,藏在片瓦只木中,因为无语,故由人评说。建筑,代表着一个时代,又跨越着每个时代。它用一个时代的语言和思想来诠释,却在另一个时代又得到重新诠释和解读。每一个时代的评说各有千秋,建筑又自成一格,但千百年过去了,若干个时代变迁了,民族的建筑,却总有一种传承的核心及同质的文化。尤如一首首凝固的音乐史诗,尽管历尽桑田,却…     

Treatment of pharmaceutical wastewater containing recalcitrant compounds in a Fenton-coagulation process

The advanced treatment using integrated Fenton＇s reaction and coagulation process was investigated in this study. Before the advancement, the pharmaceutical wastewater containing lincomycin hydrochloride was pretreated by UASB （upflow anaerobic sludge bed） and a SBR （sequencing batch reactor） process. The residual recalcitrant compounds, measured by gas chromatographymass spectrometry （GC-MS）, mainly consisted of alcohols, phenols, and nitrogenous and sulfur compounds. The experimental results indicated that when the Fenton＇s reaction was conducted at pH=3.0, H2O2CODOcr=0.27, H2O2/Fe^2＋=3：1 and 30 min of reaction time, and the coagulation process operated at a sulfate aluminum concentration of 800 mg/L and pH value of 5.0, the color and COD in the wastewater decreased by 94% and 73%, respectively; with a finale COD concentration of 267 mg/L and color level of 40 units, meeting the secondary standard of GB8978-1996 for industrial wastewater.     

Removal of total cyanide in coking wastewater during a coagulation process：Significance of organic polymers

Whether a cationic organic polymer can remove more total cyanide （TCN） than a non-ionic organic polymer during the same flocculation system has not been reported previously. In this study, the effects of organic polymers with different charge density on the removal mechanisms of TCN in coking wastewater are investigated by polyferric sulfate （PFS） with a cationic organic polymer （PFS-C） or a non-ionic polymer （PFS-N）. The coagulation experiments results show that residual concentrations of TCN （Fe（CN）6^3-） after PFS-C flocculation （TCN 〈 0.2 mg/L） are much lower than that after PFS-N precipitation. This can be attributed to the different TCN removal mechanisms of the individual organic polymers. To investigate the roles of organic polymers, physical and structural characteristics of the floes are analyzed by FT-IR, XPS, TEM and XRD. Owing to the presence of N＋ in PFS-C, Fe（CN）3- and negative flocs （Fe（CN）63- adsorbed on ferric hydroxides） can be removed via charge neutralization and electrostatic patch flocculation by the cationic organic polymer. However, non-ionic N in PFS-N barely reacts with cyanides through sweeping or bridging, which indicates that the non-ionic polymer has little influence on TCN removal.     

Effects of pre-ozonation on organic matter removal by coagulation with IPF-PACI

Ozone plays an important role as a disinfectant and oxidant in potable water treatment practice and is increasingly being used as a pre-oxidant before coagulation. The purpose of this study is to obtain insight into the mechanisms that are operative in pre-ozonized coagulation. Effects ofpre-ozonation on organic matter removal during coagulation with IPF-PAC1 were investigated by using PDA （photometric disperse analysis）, apparent molecular weight distribution and chemical fractionation. The dynamic formation of flocs during coagulation process was detected. Changes of aquatic organic matter （AOM） structure resulted from the influence of pre-ozonation were evaluated. Results show that dosage of O3 and characteristics of AOM are two of the major factors influencing the performance of O3 on coagulation. No significant coagulation-aid effect of O3 was observed for all experiments using either A1C13 or PAC1. On the contrary, with the application of pre-ozonation, the coagulation efficiency of A1C13 was significantly deteriorated, reflected by the retardation of floc formation, and the removal decreases of turbidity, DOC, and UV254. However, if PACl was used instead of AlCl3, the adverse effects of pre-ozonation were mitigated obviously, particularly when the O3 dosage was less than 0.69 （mg O3/mg TOC）. The difference between removals of UV254, and DOC indicated that pre-ozonation greatly changed the molecular structure of AOM, but its capability of mineralization was not remarkable. Only 5% or so DOC was removed by pre-ozonation at 0.6--0.8 mg/L alone. Fractionation results showed that the organic products of pre-ozonation exhibited lower molecular weight and more hydrophilicity, which impaired the removal of DOC in the following coagulation process.     

基于Matlab的短路熔痕凝固过程中熔体温度测算方法*

为解决无法对瞬时凝固的熔痕高温熔体进行测温,从而致使火灾物证鉴定界对短路熔痕组织形成规律无法达成共识的问题,使用高速摄像机采集熔痕形成时熔体的彩色影像,运用Matlab图像色温识别技术,对熔体凝固时的色彩变化进行识别与分析,从而建立测算短路熔痕凝固速率的方法。结果表明:该方法的平均标准差为9.63,标准不确定度为2.55 K,计算结果满足测试要求;在测算的10个熔痕中,灭弧瞬间熔体温度为1 734.03~2 759.15 K,初始冷却速率为-255.16~-86.61 K/ms,凝固时长为46.45~87.99 ms;灭弧时熔体温度与初始冷却速率呈近似正相关关系,与熔痕体积无关。通过此方法测算短路发生时高温熔体的温度变化,可为研究短路故障迸溅熔痕引燃、熔痕组织变化规律提供方法支持。     

施工现场塔机机群的安全使用与管理

一、前言 如果说建筑是凝固的音乐,那么大型垂直运输设备就是奏响美妙音乐不可或缺的乐器.随着建筑业的不断发展,塔式起重机应用广泛,转场频繁,装拆次数也随之增多,安全问题令人堪忧.大型工程和群体工程越来越多,单台塔机已经不能满足施工中的垂直和水平运输需要,一个工程同时使用多台塔机甚至十几台作业已屡见不鲜了.