采用过氧化氢氧化法处理酸性含氰废水技术的研究

对于黄金生产所产生的含氰废水的处理，国内主要采用氧化法或酸化法。酸化法适用于高浓度含氰废水的处理，处理后的废液含氰一般在５－５０ｍｇ／Ｌ，需进行二次处理方能排放。本文通过小型试验、工业试验研究结果，探讨了过氧化氢氧化法处理酸性含氰废水的可行性。试验表明：采用过氧化氢氧化法处理酸性含氰废水可将其中的氰化物（以ＣＮＴ计）在车间排放口降至０．５ｍｇ／Ｌ以下，药剂万分为５．９元／ｍ＾３     

全泥氰化炭浆提金工艺含氰尾矿处理技术改造与实践

介绍了一种全泥氰化炭浆提金工艺含氰尾矿处理技术新工艺方法。该方法基于采用压滤机将含氰尾矿浆压滤进行固液分离，滤饼送至尾矿库堆放，滤液用锌粉置换回收金、银；置换后的尾液采用酸化中和法处理。回收重金属离子，含氰废水返回流程利用。生产实践表明。该工艺不但综合回收尾液中的金、银、铜等有价元素，实现了含氰废水闭路循环。而且节约了处理成本。解决了尾渣的堆放难题和环境污染，具有极大的经济效益和社会效益。     

某含氰废水中重金属高效分离回收及治理试验研究

某黄金冶炼企业含氰废水中(亚)铁氰络合物、铜氰络合物质量浓度分别约为1 500 mg/L、510 mg/L,原处理工艺成本高,铜氰络合物与(亚)铁氰络合物不能有效分离。试验采用亚铁盐沉淀法-酸化法-过氧化氢氧化法联合工艺对该废水进行处理,并对试验条件进行了优化。该联合工艺有效去除氰化物的同时,实现了(亚)铁氰络合物和铜氰络合物的高效分离,且有价金属铜以沉淀形式回收。处理后废水中总氰化合物质量浓度低于50 mg/L,铜离子质量浓度低于50 mg/L,达到工艺回用标准要求。     

金精矿浸出含氰废水综合处理的研究与工业实践

处理金精矿浸出含氰废水一般采用酸化回收法，氰化物的去除率只能达到90％左右，给二次处理增加了技术与经济上的难度。文中从提高酸化回收法的氰化物去除率入手，研究改进了金精矿浸出含氰废水综合处理的工艺及设备，使氰化物的去除率达到99％以上，为二次处理创造有利条件。采用二氧化硫－空气法进行二次处理，不仅保证了废水达标排放，还可回收金、银、铜等金属，实现了经济效益、社会效益和环境效益三者的统一。     

酸化法回收氰化物现状与前景

自一九八一年用酸化回收法处理含氰废水的工艺装置投入运行到现在,已有四年多时间了,在此期间,人们对酸化回收法在黄金矿山的应用,各抒己见,褒贬不一.下面根据酸化回收法处理含氰废水的实际情况,谈一谈我们的看法.采用浮选—氰化工艺提金的矿山、其贫液组成大致如下(单位mg/1),见表1.     

黄金矿山含氰废水净化与回收工艺研究进展

黄金矿山每年产出大量含氰废水，其无害化处置和资源化回收利用是黄金矿山企业面临的严峻挑战和亟须解决的重大难题。详细介绍了含氰废水净化技术及回收工艺优缺点，净化技术包括自然降解法、生物降解法、碱性氯化法、SO₂/空气法、过氧化氢法、臭氧氧化法等，回收工艺包括AVR法、活性炭吸附法、树脂吸附法、溶剂萃取法、液膜法等，以期为黄金矿山含氰废水的处理及回收提供技术参考，最终实现矿山的绿色可持续发展。     

低浓度含氰炭浸尾浆处理工艺研究

某矿山采用碱性氯化法对氰化尾浆进行处理,该法漂白粉耗量大且氰化物去除不稳定。本文根据该矿山的现场工艺,采用加压氧化车间产生的酸化溢流液对该矿山氰化尾浆进行预处理,并优化了初始pH、反应时间、药剂用量等参数条件。在酸化溢流液预处理pH=9,不额外补加铜离子,W(Na_2SO_3):W(CN_T)=8:1,反应时间60 min条件下,总氰和游离氰根的去除效果最好,总氰去除率为99.74%,游离氰根去除率为99.85%,处理后的废水含总氰0.28 mg/L,含游离氰根0. 14 mg/L,符合《黄金行业氰渣污染控制技术规范(HJ 943—2018)》要求,并且消耗了酸化溢流液,降低了酸化溢流液中和石灰成本,取得了良好的处理效果和经济效益。     

含氰废水综合治理闭路循环的应用实践

着重介绍了含氰废水综合治理后闭路循环的应用实践。通过对含氰废水的简易酸化治理达到除杂净化的目的,既可节省全面污水治理达到排放的高额费用,又可解决尾矿坝浆式堆存厂地的不足,同时还可改善贫液闭路循环后的生产指标,缓解水源缺乏的不利局面,一举多得。辽宁省黄金冶炼厂几年的生产实践证明,采用该简易废水治理工艺可提高金总回收率1．07％,累计节省污水治理成本99万元,综合回收氰化钠36．2t,节约用水6万多m^3,经济效益相当明显。     

某黄金矿山低浓度含氰废水处理技术研究

针对某黄金矿山低浓度含氰废水开展氰化物去除试验研究,分别考察过氧化氢氧化法、亚铁盐沉淀法、因科法和生物氧化液法处理效果。结果表明:4种方法均能将总氰化合物处理至0. 5 mg/L以下,其中生物氧化液法不产生药剂成本,亚铁盐沉淀法药剂成本仅为0. 10元/m^3。从工艺可行性方面考虑,生物氧化液法需要控制溶液pH值为6,不易实现,推荐采用亚铁盐沉淀法。生物氧化液法为矿山企业处理低浓度含氰废水提供了一个新的思路。     

提金氰化物回收循环再用技术新进展

从提金含氰废水中回收利用氰化物是比氧化消除或破坏氰化物以达到排放标准更科学更经济的方法, 着重介绍了现有酸化法(AVR ) 工艺的新进展, 即新型AVR、MNR、SART 及Velardena 工艺原理及工艺过程。简述了用离子交换树脂吸附法、活性炭法、萃取法回收氰化物新技术及氰化废水全循环零排放技术。国内外研究动向分析表明, 氰化物回收循环技术是经济有效的、面向21 世纪初期可持续发展的黄金冶金绿色工程组成部分, 具有重大经济、社会及环境效益。     

转炉炉壳热应力分析

根据实际转炉建立实体模型。以有限元为手段,考虑了炉衬和炉壳材料的物性参数随温度变化的特点和炉衬与炉壳之间膨胀间隙,计算了转炉炉壳在温度载荷和炉衬膨胀压力同时作用下的热应力。所得结果可为转炉炉壳设计提供依据。     

The effect of amount of possession of the trait of hostility on accuracy of perception of hostility in others.

Some theories of personality hold that an individual's perception of others is influenced by his own personality characteristics; more specifically, that a trait of low social value will be projected more into others, and that insight into the possession of these characteristics reduces this distortion. These 2 hypotheses were tested by having a group of college students rate each other (including themselves) on degree of friendliness or hostility. Agreement with group rating about self yielded the insight score. In general, the hypotheses were supported; the "friendly" Ss were most accurate in their perception of others, and insight was positively associated with accurate perception. From Psyc Abstracts 36:04:4HL16M. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Comparison of rates of infection of two methods of emergency ventricular drainage

The rates of infection of two methods of external ventricular drainage in use at Atkinson Morley's Hospital--namely, (a) percutaneous drainage with Rickham reservoirs and (b) tunnelled ventriculostomies--were compared in this retrospective review. Percutaneous drainage of CSF with Rickham reservoirs was associated with a 27% rate of infection as identified by positive microbiological cultures; tunnelled ventriculostomy catheters had a 10% infection rate. The difference in the infection rate between the two methods was statistically significant (P < 0.015). Other variables examined, including the age and sex of the patients and the reasons for ventricular drainage, were not associated with an increased rate of infection. Most infections from either method were caused by a coagulase negative staphylococcus. The average duration of ventricular drainage before identification of positive cultures was 5.7 days for Rickham reservoirs and 6.0 days for ventriculostomies.     

浅析《野草》的版画特征

鲁迅先生一生热爱美术作品,对版画中木刻兴趣尤甚.<野草>作为其"写心之作",亦呈现出一些与木刻版画一致的审美特征:一是具有木刻版画的色彩特征,多对比、多冷色,有阴郁的美感;二是具有木刻版画的力度特征,环境描写、人物刻画处处刀锋毕现,遒劲有力,有一种"力之美".     

四辊破碎机车刀架的改造

针对四辊破碎机车刀架车削中存在的几个问题,详细介绍了电动车刀架的结构和工作原理,建立主要设计参数的数学表达式,并进行适当的分析。改造后,这种电动车刀架运行平稳、可靠、方便、省力,取得了预期的效果。     

Concept of freedom of infection of animal flocks

Totally negative results of epidemiological investigation of random samples do not prove the absence of the infection as the pathogen may be restricted to only a few animals in the herd for a long time. The statement "absence of infection" is critical for such situations. The question is raised, whether the statement "absence of infection" should be generally avoided. Classification of herds and flocks according to the prevalence of the pathogen would be more valid for the implementation of control measures.     

显微维氏硬度测量不确定度评定

对显微维氏硬度测量不确定度进行评定，建立了不确定度计算的数学模型，确定了影响实验结果的各项因素，计算出了各因素的标准不确定度，得出结果的扩展不确定度，并给出最终测量结果的表达式。     

Comparison of the results of surgical and conservative treatment of fractures of the diaphysis of the tibia

In this paper is treated the fundamental problematic of the fracture of the diaphysis of the tibia and the therapeutic results after the conservative and operative treatment are confronted. Among 518 patients with 433 open fractures and 35 with closed fractures of the diaphysis of the tibia, successful treatment of more 2/3 was obtained in the period from 1968 to 1972. Following our casuistics and literature, whose results are similar, we find out that the average total treatment of the osteosynthesis of the fracture of the diaphysis was shortened for 2,5 months depending upon the type and the localisation of the fracture. Apolied methods of the operative and conservative and conservative treatment in relation to the velocity of the medical cure as well as to the extreme anatomical-functional results are analised. We noticed that osteosynthesis, made by the intermedullary nail and the extension of the canals or by a small AO table, by the achieved stability makes conditions of immediate motions and an early rehabilitation. Because of that it gives the best functional results.