普碳钢轧钢氧化铁粉中全铁的测定

试样以盐酸溶解后，在酸性介质中，先以氯化亚锡将三价铁大部分还原为二价，然后在钨酸钠指示下，再以三氯化钛将剩余的三价铁还原为二价，过量的三氯化钛以重铬酸钾氧化消除干扰，在硫磷混合酸存在下，以二苯胺磺酸钠为指示剂，用重铬酸钾标准溶液滴定全铁量。实验结果表明，该分析方法操作简便易行，数据准确可靠，能够满足氧化铁粉对全铁含量指标化验的要求。     

湿法炼锌酸浸液中三价铁的锌精矿还原工艺

硫化锌精矿还原湿法炼锌酸浸液中三价铁存在还原效率偏低、锌精矿用量大、利用率低等问题。开展温度、锌精矿粒度、锌精矿用量及反应时间对还原液中三价铁浓度及还原率的影响等研究。结果表明：反应温度是影响硫化锌精矿还原溶液中三价铁浓度的主要因素,锌精矿粒度在低温还原时影响较为明显。低温还原所需时间长,所用锌精矿量大,80 ℃下锌精矿粒度小于58 μm、锌精矿加入系数1.8以上、反应时间3 h以上才能使还原液中三价铁浓度小于0.5 g/L;升高温度可缩短反应时间,减少锌精矿用量,120 ℃下锌精矿粒度150 μm、锌精矿加入系数1.5、反应时间1 h即可使还原液中三价铁浓度小于0.5 g/L。采用加压工艺提高还原温度,可有效提高锌精矿的利用率和三价铁的还原率,降低还原渣量,有利于还原渣后续处理。     

陇南铁矿石中全铁量的测定

本法采用硫磷酸分解,在盐酸介质中,用二氯化锡将三价铁还原至二价,再用二氯化汞除去过量的二氯化锡,以二苯胺磺酸钠作指示剂,用重铬酸钾标准溶液滴定测全铁量.本法样品溶解完全,溶解速度快,分析精确度高.     

硫精矿中铁含量测定方法的探究

采用重络酸钾容量法测定硫精矿中铁的含量,用盐酸、硝硫混酸溶解试样,在盐酸溶液中,用二氯化锡将三价铁还原成二价铁,然后加入二氯化汞溶液,并以氧化过量的二氯化锡,以二苯胺磺酸钠为指示剂,用重络酸钾标准溶液滴定至溶液由浅绿色变为紫色为终点。讨论了溶解样品时酸的选择,氧化还原温度的控制,二氯化锡还原三价铁的溶液温度、体积的控制以及氢氧化铵沉淀铁时的用量对测定结果的影响,选择了最佳测定条件。本方法具有操作简便,准确快速、检测数据稳定等特点,填补了中色红透山硫精矿中铁含量捡测技术的空白,并且在检测分析工作中得到很好的应用。     

水热法沉淀三价铁工艺条件对产物形态影响的研究

本文研究了水热法沉淀三价铁过程中体系初始三价铁浓度、初始pH对沉淀产物物相的影响。一定条件下,在三价铁浓度逐渐降低过程中,铁沉淀产物逐渐由碱式硫酸铁向三氧化二铁转变;同时,一定条件下pH逐渐提高过程也有类似的效果。研究结果表明,实际中可以通过控制适当的条件,利用三价铁溶解直接生产铁红产品。     

水热法沉淀三价铁工艺条件对产物形态影响的研究

本文研究了水热法沉淀三价铁过程中体系初始三价铁浓度、初始pH对沉淀产物物相的影响。一定条件下,在三价铁浓度逐渐降低过程中,铁沉淀产物逐渐由碱式硫酸铁向三氧化二铁转变;同时,一定条件下pH逐渐提高过程也有类似的效果。研究结果表明,实际中可以通过控制适当的条件,利用三价铁溶解直接生产铁红产品。     

含磁黄铁矿、方铅矿闪锌矿矿石中铜的物相分析

铜矿化学物相分析已有许多成熟的方法。对于测定铁氧化物、硅酸盐等结合的氧化钢,一般采取水浴上用酸性溶剂浸取的方法。矿石中如含有铁矿、方铅矿、闪锌矿,则会影响结合氧化铜的分离。另外,溶液中的还原气氛不易保持,三价铁会溶解铜的硫化物。     

水杨酸-乙醇光度法测定炉渣、矿石、烧结矿中金属铁

在氯化高汞和水杨酸钠的乙醇溶液中选择性地溶解金属铁。水杨酸钠消除不溶性碱式三价铁盐的生成,乙醇防止铁的氧化物的溶解,在醋酸钠缓冲溶液中,三价铁离子与磺基水杨酸反应生成黄褐色络合物,在波长460～470nm处测定络合物吸光度,从工作曲线上查得金属铁含量。     

微波消解-重铬酸钾滴定法测定稀土发火合金中铁含量

以盐酸作为消解试剂,采取高压密闭微波加热方法对稀土发火合金样品进行消解,加入氨水从而去除铜干扰,生成的沉淀加入盐酸溶解,加入二氯化锡三价铁还原,剩余的三价铁以钨酸钠为指示剂,加入三氯化钛进行还原。最后加入硫磷混酸,用重铬酸钾标准滴定溶液进行滴定,滴至二苯胺磺酸钠指示剂呈紫色,实现对稀土发火合金中铁量的测定。方法用于5个稀土发火合金样品中铁量的测定,相对标准偏差(n=11)均小于0.3%,回收率在99.6%~100.4%之间。本方法适用于稀土发火合金中铁含量的测定。     

铝—重铬酸钾滴定法测定铬铁矿中全铁

本文详细地探讨了用铝还原三价铁为二价铁的反应条件。采用磷酸稳定四价钛而消除钛的干扰，大量铬不影响还原和滴定。方法应用于铬铁矿中全铁的测定，简便快速，结果令人满意。     

熔炼次数对M17返回料合金成分、组织和性能的影响

实验结果表明,M17铸造高温合金(%:0.16C、8.79Cr、5.79A1、4.93Ti、3.29Mo、15.20Co、0.78V、0.015B、0.073Zr、0.002S、0.001P、0.001 1O、0.001 0N)经25 kg真空感应炉返回重熔后,Si含量随重熔次数的增加而略有增加,合金中主要元素和其它杂质元素S、P、H的含量变化不大,而氧、氮略有增加;合金中初生碳化物由新合金中的草书体逐渐向返回合金块状转变,初生碳化物的遗传性堵塞合金凝固时的补缩通道,使返回料合金的疏松倾向增大,高温塑性下降较大。     

Shijiazhuang will Build the World's Biggest Replacingcopper-with-aluminum Cable Production Base

正Shijiazhuang City will build the world’s biggest replacing-copper-with-aluminum cable production base,the annual output value can reach 100 billion yuan,in the future it will develop replacing-copper-with-aluminum highend industry cluster.This piece of news was learned by the reporter at the Rare Earth highiron Aluminum Alloy[Nonferrous Business Opportunity:Aluminum alloy door]Cable Conductor New Technology Application Seminar held at the provincial capital.     

Chongqing is Preparing to Set Up Nonferrous Metal Exchange,in a Bid to Become the Transit Place of Kazakhstan Copper

正Since the beginning of Chongqing’s upgrading to a municipality directly under the Central Government,Chongqing City has established direct friendly relationship with Almaty,Kazakhstan,and carried out a series of cooperation in commerce and trade,and culture     

Guangxi Baise Extends Industrial Chain to Combat Loss in Aluminum Business

正"For each tonne of aluminum being produced,the upstream enterprise on the aluminum industrial chain will suffer loss about 2000yuan."Said Liang Xiao,Deputy Director of Pingguo Industrial Park Management Committee under the Guangxi Baise City,one of the four major aluminum industry bases in China,on August 11.Extending aluminum     

JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL ANNUAL CONTENTS Volume 21(2014)

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Chinalco Straightened Out Copper Assets,and Delegated Stock Equity of Yunnan Copper

正Immediately after the news that Chinalco transferred 58%stock equity of Yunnan Copper Group to its wholly-owned subsidiary China Copper Corporation Limited free of charge was disclosed on July 9,many individual investors couldn’t help but to think:Does it mean China Copper Corporation Limited will assemble assets for overall listing?At present,among main copper business companies under China Copper Corporation     

The Development and Reform Commission Encourages Private Capital to Enter Geological Prospecting Field

正At the press conference recently held by the National Development and Reform Commission under the theme"Deepen Reform in Investment AuditApproval System",when answering questions from reporters,Huang Min,Director of the Department of Fixed Assets Investment of the National Development and Reform Commission,said that in the future it would continue to intensify efforts in geological prospecting,and actively guide social capital to enter this field.     

Guangxi's first Nickel Industry Development Research Report Was Released

正Recently,Guangxi Metallurgical Research Institute,a subsidiary of Guangxi Nonferrous Metals Group,completed survey on laterite and related manufacturers in the region,by combining the current development status of laterite both at home and abroad,it compiled Guangxi’s first"Research Report on the Development of Guangxi Nickel Industrial Chain"which adopted laterite as the study subject.This report expounded on the current     

China’s Major Non-ferrous Metals Imports & Exports(End of September. 2014)

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China's Major Non-ferrous Metals Imports & Exports

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