高纯氧化铁中杂质元素对锰锌铁氧体性能的影响

提出了一种利用含亚铁废盐（或废液）连续中和氧化生产Ｍｎ－Ｚｎ铁氧体用高纯α－Ｆｅ２Ｏ３的方法，并分析了高纯Ｆｅ２Ｏ３中杂质元素Ｓｉ、Ｋ、Ｎａ、Ｃａ、（或Ｃｌ－）、Ａｌ、Ｐｂ等对Ｍｎ－Ｚｎ铁氧体性能的影响，指出原材料的合格品质是制成优质Ｍｎ－Ｚｎ铁氧体的先决条件。     

电弧炉炼钢尖晶石铁粉法形成的机理

通过对电弧炉粉尘的尖晶石、铁微粒特征的研究，谷得出尖晶石、铁粉尘形成的机理，其结果如下：（１）电弧炉粉尘的尖晶石、铁微粒的化学分子式为（ｎｘＺｎｙＦｅ１－ｘ－ｙ）Ｆｅ２Ｏ３；（２）氧气输送到渣钢界面时，钢 形成大量氧化物层（从表面到内部），它们分别是（Ｍｎ，Ｚｎ）Ｆｅ２Ｏ４，（Ｍｎ，Ｚｎ）Ｆｅ２Ｏ４－Ｆｅ３Ｏ４，Ｆｅ３Ｏ４－（Ｍｎ，Ｆｅ）Ｏ和（Ｍｎ，Ｆｅ，）Ｏ。（３）一些尖晶石，铁粗粒粉末其表面经     

杂质Cu,Zn,Sn离子与Fe共沉积的电化学行为

研究了杂质Ｃｕ、Ｚｎ、Ｓｎ在氯化物和硫酸盐电解质溶液中与Ｆｅ共沉积的电化学行为及其对提取纯度电解铁的影响,发现Ｆｅ－Ｃｕ共沉积是Ｃｕ先析出的正常型共沉积,Ｆｅ－Ｚｎ共沉积在４０℃低温时是Ｚｎ先析出的异常共沉积,８０℃高温时是Ｆｅ先析出的正常型共沉积,Ｆｅ－Ｓｎ共沉积在高流密度时属Ｆｅ优先析出的导演型共沉积。     

制备软磁锰锌铁氧体粉的共沉淀条件的热力学分析

通过对Ｆｅ（Ⅱ）－Ｍｎ（Ⅱ）、Ｚｎ（Ⅱ）－ＮＨＨＣＯＮＨ．Ｈ世Ｏ－ＨＯ体系进行热力学分析 计算，给出了溶液中Ｆｅ（Ⅱ）、Ｍｎ（Ⅱ）、Ｚｎ（Ⅱ）的浓度与ＰＨ值的关系，由此确定了３种金属离子共沉淀完全的ＰＨ值范围。指出该ＰＨ范围主要由Ｚｎ＾２＋沉淀完全的酸度条件决定，而后者则取决于碳酸铵与氨的加入量。     

Fe—C—P,Fe—Mn—P,Fe—Si—P三元金属熔体作用浓度计算模型

根据含化合物的金属熔体结构的共存理论，推导了１６７３Ｋ下Ｆｅ－Ｃ－Ｐ、Ｆｅ－Ｍｎ－Ｐ、Ｆｅ－Ｓｉ－Ｐ三元金属熔体作用浓度计算模型。计算的磷的作用浓度与相应的实测磷活度相符合，从而证明所得模型可以反映Ｆｅ－Ｃ－Ｐ、Ｆｅ－Ｍｎ－Ｐ、Ｆｅ－Ｓｉ－Ｐ三元熔体的结构本质。同时模型揭示了Ｃ、Ｍｎ、Ｓｉ的摩尔分数对磷的转换系数的影响规律。     

硫酸铵—1—（2—吡啶偶氮）—2—萘酚—磺酸—Tween80体系萃取分离铁

研究了硫酸铵－１－（－２－吡啶偶氮）－２－萘酚－Ｔｗｅｅｎ８０体系萃取铁的行为。试验表明,当溶液ＰＨ２．０～４．０能使Ｆｅ（Ⅱ）与Ｚｎ（Ⅱ）与Ｚｎ（Ⅱ）,Ｃｄ（Ⅱ）、Ｍｎ（Ⅱ）、Ｍｇ（Ⅱ）、Ａ（Ⅲ）定量分离。应用该计测定了铝铪合金中Ｆｅ的含量,结果满意。     

Fe-Cu-C-MnS烧结易切削钢中MnS的透射电镜分析

通过透射电子显微镜（ＤＥＭ）分析了Ｆｅ－Ｃｕ－Ｃ－ＭｎＳ烧结易切削钢及含微量硫、磷和钙的Ｆｅ－Ｃｕ－Ｃ－ＭｎＳ烧结钢中的ＭｎＳ，并采用电子衍射分析其晶体结构，发现：在烧结过程中，不同烧结钢中ＭｎＳ结构是否发生变化取决于ＭｎＳ的添加方式和其他元素的存在。     

磁性材料中铝和钛的连续示波滴定

磁性材料中铝和钛的连续示波滴定陆为林（盐城工业专科学校,盐城,２２４００２）磁性材料中主要组成元素有：Ｆｅ、Ｎｉ、Ｃｏ、Ａｌ、Ｔｉ、Ｍｎ、Ｚｎ等,Ａｌ,Ｔｉ的测定通常采用络合滴定法和分光光度法［１,２］,共存的干扰组分需进行复杂的分离。本文在文献［３...     

Fe—Mn合金脱氧能力的计算

本文在推导Ｆｅ－Ｍｎ合金熔体作用浓度计算模型的基础上，进一步计算了Ｆｅ－Ｍｎ－Ｏ系金属熔体平衡氧浓度，其结果与实验数据完全一致。     

铁铝合金的磁性

本文根据Ｆｅ－Ａｌ合金中Ａｌ含量的变化导致其结构的变化，分别介绍了６％Ａｌ－Ｆｅ，（８－１０）％Ａｌ－Ｆｅ，１２％Ａｌ－Ｆｅ，１４％Ａｌ－Ｆｅ，１６％Ａｌ－Ｆｅ，（１２－１６）％Ａｌ－Ｆｅ－Ｍ（Ｍ＝Ｍｏ，Ｍｎ，Ｃｒ，Ｚｒ，Ｔａ，Ｃｅ）Ｆｅ－Ｓｉ－Ａｌ等合金的磁性能。     

利用黄钾铁矾渣制备软磁锰锌铁氧体工艺研究

以黄钾铁矾渣和硫酸锰为原料,通过热酸浸出、净化除杂、共沉淀和铁氧体工艺等过程,制备出锰锌铁氧体产品。实验结果表明,Fe和Zn的浸出率为90%～95%,Cu²⁺、Cd²⁺、Ca²⁺和Mg²⁺平均去除率分别为99%、85%、92%及85%;共沉淀粉含Fe 45.11%、Mn 16.12%、Zn 4.97%、Ca 0.0155%、Mg 0.0025%、Si 0.0017%、Cu 0.00058%、Cd 0.0006%;铁氧体产品的磁性能够达到日本TDK公司PC30指标。     

Upgrading of Low-Grade Manganese Ore by Selective Reduction of Iron Oxide and Magnetic Separation

The utilization of low-grade manganese ores has become necessary due to the intensive mining of high-grade ores for a long time. In this study, calcined ferruginous low-grade manganese ore was selectively reduced by CO, which converted hematite to magnetite, while manganese oxide was reduced to MnO. The iron-rich component was then separated by magnetic separation. The effects of the various reduction parameters such as particle size, reduction time, temperature, and CO content on the efficiency of magnetic separation were studied by single-factor experiments and by a comprehensive full factorial experiment. Under the best experimental conditions tested, the manganese content in the ore increased from around 36?wt?pct to more than 44?wt?pct, and almost 50?wt?pct of iron was removed at a Mn loss of around 5?pct. The results of the full factorial experiments allowed the identification of the significant effects and yielded regression equations for pct Fe removed, Mn/Fe, and pct Mn loss that characterize the efficiency of the upgrading process.     

A review of the beneficiation of low-grade manganese ores by magnetic separation

ABSTRACT

Magnetic separation is an effective strategy for the upgrading of a variety of lean ores, including the beneficiation of low-grade manganese ores. This work reviews 24 studies on the magnetic separation of manganese ores; 6 of these studies report both a sufficiently high Mn grade (>44% Mn) and Mn/Fe ratio (>7.5) in the concentrate as to be suitable for use as high-grade feed materials in the production of ferromanganese. Of these 24 studies, the most efficient separation and enrichment was generally achieved by the reduction roasting of the ore prior to magnetic separation, rather than the direct separation of the ore. In both cases there was sufficient evidence for correlation, depending on the mineralogy, between the Mn and Fe grades of the ore and the final concentrate grade and Mn/Fe ratio. To yield a concentrate suitable for use in ferromanganese production, it is recommended that the ore contain a minimum initial concentration of ～25% Mn and ～10% Fe.     

Direct Reduction of Mixtures of Manganese Ore and Iron Ore

This paper presents recent results of direct reduction investigation of different combination of blends of manganese ore, iron ore and coal at the Department of Ferrous Metallurgy (IEHK) of RWTH Aachen University. A mixture of iron and manganese ore in a ratio of 75/25 is a good raw material for steelmaking of high Mn‐alloyed grades. The experimental studies consisting of reduction of (a) fine material and (b) agglomerated material (briquettes) were carried out in the range of 1273 to 1673 K. The behaviour of combined reduction of manganese ore and iron ore and the employment in the direct reduction on a coal and gas basis for production of steels with high Mn content were investigated. It was found that a high metallization degree for Mn can be reached at 1273 K with the reduction of manganese ore by hydrogen‐containing gas. Addition of carbon monoxide to the reducing gas retarded the reduction process. The addition of coal to manganese ore and iron ore blends increased the degree of reduction. The results of carbothermic reduction of briquettes consisting of a mixture of manganese ore and iron ore combined with coal as reducing agent show that a high temperature, a low Mn/Fe ratio and a high Fe₂O₃ content have a favourable effect on the degree of reduction. In order to obtain a high degree of metallization, the temperature should be higher than 1473 K. The reduction of briquettes at higher temperatures (up 1573 K) has shown a molten phase and the separation of slag and metal.     

电炉粉尘预处理对其合成Ni-Zn铁氧体性能的影响

摘要：尖晶石型铁氧体MFe2O4（M=Ni、Zn、Mn和Mg等）由于其良好的稳定性和优越的磁电性能,在磁电领域受到广泛应用。以电炉粉尘为原料,先利用NaOH溶液对电炉粉尘进行预处理,然后加入不同含量的NiCl2·6H2O,通过水热方法直接合成具有尖晶石结构的Ni-Zn铁氧体（(Ni,Zn)Fe2O4）,最后详细探讨了不同浓度的NaOH预处理除硅和配入不同量NiCl2·6H2O对合成(Ni,Zn)Fe2O4磁性能的变化规律。结果表明,当NaOH浓度从0增加到10mol/L时,预处理后电炉粉尘中SiO2质量分数从6.85%降低到1.49%,合成的Ni-Zn铁氧体的饱和磁感应强度从19.5A·m2/kg升高到32.3A·m2/kg;而预处理后电炉粉尘与NiCl2·6H2O的质量比从1∶0.7降低到1∶0.9时,所得样品的饱和磁感应强度从28.4A·m2/kg增长到32.3A·m2/kg。该工艺不仅简化了电炉粉尘的处理工艺流程,而且实现了其高附加值利用。     

Dissolution behaviour of manganese ore in basic oxygen furnace type slag

In order to improve manganese yield during the reduction process of manganese ore in blowing practices employing less slag at BOF, the dissolution behaviour of manganese ore in slag has been studied in an experimental scale. The effect of temperature, slag composition, addition of CaF₂, and pre-treatment of manganese ore was examined for the dissolution behaviour of manganese ore into BOF type slags. The precipitation of (Fe,Mn)O phase in slag was observed during the addition of manganese ore. The dissolution rate of manganese ore into molten slag increased with temperature, and also increased with the initial contents of FeO, MgO and MnO. However, the effect of slag basicity was not evident on the dissolution rate of manganese ore into slag. The addition of CaF₂ and pre-treatment of Mn ore were very effective to promote the dissolution of manganese ore into slag.     

广西某地氧化锰矿的选矿试验研究

试验研究从工艺矿物学入手,针对广西某氧化锰矿石锰矿物嵌布粒度粗细不均的特点,制定较为合理的分级—磁选流程,取得了较为满意的指标,获得放电锰精矿锰品位44.47%、MnO2品位66.23%、铁品位3.06%、锰回收率60.45%。     

电感耦合等离子体原子发射光谱法测定锰黄铜中7种元素

采用盐酸和硝酸混合酸溶样,选择Cu 324.754nm、Mn 257.610nm、Zn 213.856nm、Fe 259.940nm、Al 396.152nm、Pb 220.353nm、Sn 189.989nm作为分析线,考察基体和共存元素对待测元素的干扰,并计算干扰系数以校正光谱干扰对测量结果产生的影响,从而建立了电感耦合等离子体原子发射光谱法(ICP-AES)测定锰黄铜中Cu、Mn、Zn、Al、Fe、Pb、Sn的方法。结果表明:溶液中Cu质量浓度在1 000μg/mL以内,对Mn、Zn、Al、Fe、Sn的测定无明显影响,但对Pb影响较大。来自Cu 221.810nm对Pb 220.353nm分析线产生的谱线重叠型光谱干扰,可以采用干扰系数校正法很好地进行校正。样品中高含量元素Zn、Mn、Fe之间以及对其他元素的测定基本无影响。各元素校准曲线线性相关系数均不小于0.999 7;各元素检出限为0.000 1%~0.004 2%(质量分数)。按照实验方法测定锰黄铜标准样品中Cu、Mn、Zn、Al、Fe、Pb、Sn,结果的相对标准偏差(RSD,n=6)为0.49%~5.1%,测定值与认定值一致。     

天台山碳酸锰矿石的焙烧特性

天台山碳酸锰矿石,从组分分析,为CaMg[CO_3]_2—CaMn[CO_3]_2类质同象矿石,矿石中碳酸盐矿物的含量较高,二元碱度大于1.3,系中磷低铁碳酸锰贫矿。文章在全面分析矿石组成特征的基础上,介绍了它的焙烧特性。经自燃式竖窑焙烧工业试验,焙烧矿石平均锰品位比入炉矿提高15.09％,Mn/Fe值上升6,P/Mn值降低0.022。工业试验成果通过鉴定,已被生产采用。     

沙沟锰矿烧结性能探讨

贵州六盘水沙沟锰矿中的锰平均含量高达33.44%,铁含量为5.99%,属于典型的软锰矿。其锰铁比为5.58,有较低的硫和磷含量使该矿成为国内为数不多的锰系合金原料。但由于其极细的粒度（〈200目的矿粉占70%以上）和极粘的物理特性又使该矿不可能直接入炉冶炼,必须进行造块处理。本文通过不同碱度和配碳量的烧结杯试验探讨沙沟锰矿的烧结性能。