共查询到20条相似文献,搜索用时 531 毫秒
1.
2.
文中对含钒废水中六价铬的处理进行了试验研究。用Na2S2O3液体(海波液)连续处理,将其还原成Cr3+,再经沉淀分离,使之达到国家排放标准。 相似文献
3.
4.
用焦亚硫酸钠、海波上层液分别处理沉钒废水,研究表明:海波上层液还原沉钒废水COD高达2 878 mg/L,远超排放标准;用焦亚硫酸钠还原沉钒废水,中和、沉淀能够获取低COD废水、低铁含铬渣。用焦亚硫酸钠处理沉钒废水工业运行技术条件:焦亚硫酸钠加入倍数3.1~3.2,还原反应时间15~30 min。处理后废水经汽提脱氨塔脱氨后,排向污水处理厂的废水未检出六价铬,COD平均值65 mg/L,符合辽宁省地方排放标准《污水综合排放标准》DB21/1627—2008排放限值,所得含铬渣中铁含量较低(以Fe2O3计0.27%),铬含量高(以Cr2O3计41.6%)。含铬渣经煅烧窑煅烧、炉外法冶炼出牌号JCr95金属铬(Cr≥95%)产品,质量合格。 相似文献
5.
6.
中国粉末冶金五协学会联席会议于 2 0 0 1年 3月 5日至 6日在中南大学召开了第二次工作会议 ,参加会议的有 :中国粉末冶金五协学会联席会议主席、中南大学常务副校长黄伯云院士、中国有色金属学会粉末冶金及金属陶瓷委员会副理事长吕海波教授、中国钢协粉末冶金协会理事长李森蓉教授级高工、中国金属学会粉末冶金学会常务副理事长曹勇家教授、中国机械工程学会粉末冶金学会理事长王尔德教授、中国机协粉末冶金协会副理事长苏天祝教授级高工、中科院沈阳金属研究所王崇琳研究员、中南大学粉冶所赵慕岳教授、中国钢协粉末冶金协会副秘书长何斌… 相似文献
7.
8.
9.
10.
本文从法律体系、公众参与体系、标准体系.示范体系,创新体系.监测体系这六方面逐一分析、探讨了大遗址管理体系的构建。 相似文献
11.
针对铜闪速护反应塔内衬蚀损状况检测的传统方法所存在的局限性,提出了一种基于红外点温仪在线扫描识别反应塔内衬蚀损的非接触实时监测的新方法,并设计了一套相应的监测诊断系统。仿真实验表明,该方法技术可行,系统易于实现且经济实用,能满足闪速护运行工况要求。本文重点讨论了系统的多线程串行通讯实现。 相似文献
12.
赵佳琪 《湖南冶金职业技术学院学报》2007,7(3):50-52,58
作业成本法是指以作业为中心,以资源流动为线索,通过对资源耗用因果关系的分析,计算出产品成本,为企业各项经营管理决策提供相关信息,支持新的成本核算和管理的方法,其基本原理是“产品消耗作业,作业消耗资源”。推广应用作业成本法,能合理的核算、分配资源成本,用低成本生产高质量的产品,为国家节省资源,为企业增效。 相似文献
13.
14.
15.
16.
17.
本文介绍了一种用二级淋洗处理白钨精矿湿法冶金尾气中的HCl气的方法。实践证明,该方法的应用,既能从根本上治理HCl气体污染,又能最大限度地降低处理成本。 相似文献
18.
Many spectrum correction methods have been developed, but their performance degrades signif- icantly when they are applied to the correction of low frequency component ( LFC ). It owns to that the model underlying the conventional approaches neglects the interference of the negative frequency in the real signal. A new approach for the correction of the LFC is proposed, which suits all kinds of symmetrical windows. It divides a signal into three sections and makes use of the first spectrum line of each section. Then this approach is modified so that it is also applicable to the correction of the high frequency component. Thus a timedelay-based all-frequency correction method is proposed. The simulation results show that this method is simple and feasible. By this method, the accurate frequency, amplitude and phase of the spectral line can be obtained whether it is close to or far from OHz. 相似文献
19.
A suitable modification of the standard AOAC method for the measurement of dietary fibre is proposed to quantitatively include beta-fructans in the determination of the soluble dietary fibre fraction and as a consequence in the related total dietary fibre fraction. The standard AOAC method is modified by including a preheated commercial inulinase, Novozym SP 230, to the amyloglucosidase incubation step. It was previously outlined that this commercial inulinase contains some pectolytic activity. It is now demonstrated that a heat pretreatment of this enzyme preparation at 60 degrees C for 2 h eliminates this pectolytic activity while keeping sufficient activity to hydrolyse all the inulin from the soluble fibre fraction. 相似文献
20.
On the use of analytic approximations for describing the macroscopic heat flow during solidification
A. J. Pedraza S. Harriague D. Fainstein-Pedraza 《Metallurgical and Materials Transactions B》1980,11(2):321-330
In this paper both conceptual and numerical analyses of the integral profile method as applied to solidification problems
are conducted. Two important examples are considered,viz. a case where the nonsteady state exact solution of the thermal field is known and a thermal analysis of continuous casting.
It is shown that the method as it was generalized by Hills may lead in the latter case to serious contradictions with basic
thermodynamic principles. It is also shown that the method developed by Tien using a different set of boundary conditions
is unsuitable for treating general solidification problems. It is thus concluded that approximate solutions of the thermal
field during solidification must be evaluated under rather severe boundary conditions. 相似文献