桃江高硫富锰矿焙烧脱硫试验

桃江锰矿棠甘山矿区是该矿新建设的富锰矿点,现阶段主要勘探和开采的是高硫富锰矿。根据勘探资料认为,该矿区高硫富锰矿原属“湘潭式”沉积碳酸锰矿床,成矿后由于矿区东侧火成岩浸入,变质为硫锰矿—菱锰矿矿床,其储量具有相当规模,是我国大型锰矿之一。该矿区高硫富锰矿含锰矿物主要为:3.32%硫化锰、5.03%碳酸锰、10.11%锰方解石、     

纯加纳碳酸锰矿生产锰系合金的技术创新与应用

加纳碳酸锰矿具有储量大,锰铁比高,杂质含量低的特点。采用带式烧结或回转窑烧结工艺处理后的烧结矿具有表面积大、强度高、透气性好、降低还原剂强度要求等特点,根据宁夏天元锰业6台30 000 kVA密闭式硅锰矿热炉应用实践,实现了纯加纳碳酸锰矿100%做为锰系合金冶炼原料、100%烧结矿入炉冶炼、采用兰炭替代焦炭做还原剂,为锰系合金冶炼开辟新的工艺途径。使锰硅生产组织入炉原料单一稳定,操作简单,运行可靠,提高生产效率和金属回收率,降低冶炼成本,还可实现废渣资源化循环利用,综合效益显著。     

硼泥烧结锰矿及其在硅锰合金冶炼中的应用

目前,我厂硅锰合金冶炼中使用的熔剂一般为白云石或石灰石。这些碱性氧化物都以碳酸盐形式存在,在炉内分解时放出大量二氧化碳,需要吸收热量。若采用硼泥烧结锰矿,用硼泥代替部分白云石或石灰石,则在硅锰合金冶炼过程中可少消耗分解热,从而起到节能的效果。另外硼泥烧结锰矿中MgO含量较高,使硅锰渣中MgO的含量增高,对降低硅锰渣中的含锰量也起到一定的作用。     

氧气顶吹转炉使用烧结锰矿来提高锰的回收率

氧气顶吹转炉使用烧结锰矿来提高锰的回收率日本钢铁公司在氧气顶吹转炉炼铜的脱氧期，采用了加入烧结锰矿，提高了锰的回收率。该公司既进行了１００ｋｇ级的实验室试验，又进行了３４０ｔ级的工业规模的试验。加入烧结锰矿后，使［Ｍｎ］的氧化损失减少。因为烧结时，锰...     

锰矿烧结点火器结瘤问题初析

锰矿烧绪点火器结瘤,是锰矿烧结工艺有别于铁矿烧结的一个特殊现象,也是锰矿烧结生产中急待解决的一个问题。本文将对锰烧结瘤的情况、特点和成因、以及防止结瘤的可能途径,作一粗浅分析,以期为促进锰烧生产和锰烧点火器的结构改进,提供一些有益的佐证。     

云南澜沧县银锰矿中银的化学物相分析探讨

银的化学物相分析主要是分析银在各载体矿物中的含量。以往银的化学物相分析研究主要集中在铅锌矿,银锰矿中银的化学物相分析报道很少。实验通过对云南澜沧县银锰矿中锰的化学物相分析后,确定了该矿中银主要分为碳酸锰中银、与锰结合银、自然银、硫化银、铁氧化物中银和硅酸盐中银6相。选取醋酸溶液浸取碳酸锰中银,亚硫酸溶液浸取与锰结合银,硝酸铁溶液浸取金属银,硫脲-硫酸溶液浸取硫化银,硝酸浸取硫化物中的银,最后残渣测定硅酸盐中的银。通过对该矿进行6次分析,得到其各相态中银的含量,分析结果稳定,各相态银的相对标准偏差(RSD)均小于10%,满足物相分析的误差要求,且各相态银加和等于总银,说明分相正确。     

云南澜沧县银锰矿中银的化学物相分析探讨

银的化学物相分析主要是分析银在各载体矿物中的含量。以往银的化学物相分析研究主要集中在铅锌矿,银锰矿中银的化学物相分析报道很少。实验通过对云南澜沧县银锰矿中锰的化学物相分析后,确定了该矿中银主要分为碳酸锰中银、与锰结合银、自然银、硫化银、铁氧化物中银和硅酸盐中银6相。选取醋酸溶液浸取碳酸锰中银,亚硫酸溶液浸取与锰结合银,硝酸铁溶液浸取金属银,硫脲-硫酸溶液浸取硫化银,硝酸浸取硫化物中的银,最后残渣测定硅酸盐中的银。通过对该矿进行6次分析,得到其各相态中银的含量,分析结果稳定,各相态银的相对标准偏差(RSD)均小于10%,满足物相分析的误差要求,且各相态银加和等于总银,说明分相正确。     

含锰原料部份冶金性能的测定

我国具有丰富的贫锰矿资源,这些贫锰矿一般不能直接入炉冶炼优质的锰系铁合金,必须对它进行予处理。在铁合金厂一般采用烧结或富锰渣富集法。前者主要处理粉矿,而后者是为了提高锰的品位,降低磷的含量。无论是锰矿烧结或是冶炼成富锰渣,它们的冶金性能与原生锰矿有很大的差异,它直接影响冶炼效果,因而对它们的研究十分有必要。本文概述了近年来我们的一些工作。     

回收单晶硅片切割浆料冶炼锰硅合金的试验研究

通过在烧结锰矿时添加一定量的单晶硅片切割过程中产生的废浆料,来提高烧结锰矿中SiO_2的含量,加入矿热炉后进行锰硅合金的冶炼,不仅有效降低了硅石消耗,带来经济收益,同时对单晶硅片切割浆料进行资源回收利用处理,避免其对生态环境造成污染,实现了经济循环发展,具有一定的社会及环境意义。     

锰矿冷粘球团试验

前言锰矿冷粘球团半工业试验,在玛瑙山锰矿获得了初步成功。玛瑙山锰矿位于湖南郴州地区。该矿属于热液交代型铁锰多金属矿床,矿石储量较大,矿体比较完整,可用露天开采,采矿条件较好。现有玛瑙由(蛇形)和枫树下两个采区,已形成一定规模的生产能力。矿体由氧化铁锰铅矿、矾铁硫锰方铅矿(原生矿)及含铅铁锰土等类型组成。矿石平均地质品位含锰10～18%、含铁15～27%、含     

铁锰矿和贫锰矿的合理利用

本文通过生产实践得出,含 Mn18—28％,(Mn Fe)38—48％的铁锰矿都可在高炉中生产富锰渣。利用高磷高铁的铁锰矿和低磷高硅贫锰矿进行配矿入炉,采用自然碱度酸性渣操作,控制渣中SiO_2含量在24—30％,可以炼出低磷低铁优质富锰渣。     

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.     

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。     

Consolidation Behavior of High-Fe Manganese Ore Sinters with Natural Basicity

High-iron content manganese ore resources are becoming the mainstream raw ores for manganese extraction due to the depletion of high-grade manganese ores. Our previous research has reported the optimization parameters for the sintering of high-Fe manganese ore (abbr. high-Fe Mn-ore) fines. This study further investigated the consolidation behavior of high-Fe Mn-ore sinters with natural basicity. Sintering pot tests showed that the high-Fe Mn-ore sintering required high coke breeze dosage (about 9.9 wt.%). The CO content of the outlet flue gas (7.5 vol.%~8.0 vol.%) in the high-Fe Mn-ore sintering was higher than that in the ordinary iron ore sintering (1.0 vol.%~2.2 vol.%). XRD and SEM-EDS analyses indicated that the major mineral phases in the sinters included Fe-Mn oxides (Fe_xMn_3-xO₄), ferrotephroite ((Fe,Mn)₂SiO₄), Ca-,Al-,Mn-,Fe- bearing silicate melts, and a small quantity of hausmannite (Mn₃O₄) and free quartz (SiO₂). Optical microstructure and SEM images showed that the Fe-Mn oxides, Ca-, Al-, Mn-, Fe- bearing silicate melts and ferrotephroite particles are closely interconnected with one another. The formation of Fe-Mn oxides and ferrotephroite were beneficial to the sinter strength. Thermodynamic and phase diagram analyses further demonstrated that the major bonding phases of Fe-Mn oxides and ferrotephroite were easily formed under the strong reductive sintering atmosphere of high-Fe Mn-ores.     

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.     

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.     

由软锰矿,闪锌矿,铁屑直接制取锰锌铁氧体软磁材料新工艺研究

本文结合磁性材料工艺和锰矿技术特点，创造性地提出由软锰矿、闪锌矿制备锰锌铁氧体材料，克服了锰矿、闪锌矿处理过程的Ｍｎ－Ｚｎ、Ｍｎ－Ｆｅ、Ｚｎ－Ｆｅ分离难题，大大降低了磁性材料生产成本，由于磁性材料产品附加值高，从而为我国丰富的贫锰矿利用找到了一条有效的途径     

电感耦合等离子体发射光谱法测定矿产品中微量硫的研究

研究了利用电感耦合等离子体发射光谱法（ＩＣＰ－ＡＥＳ）测定铁矿、锰矿、水泥等矿产品中微量硫的溶样方法、工作条件的选择和结果的准确性。实验表明,王水溶样方法可靠,Ｓ１８０．７３１ｎｍ分析线可避免大量存在的Ｍｎ、Ｆｅ等基体元素的干扰,测定结果相对标准偏差小于２％,与国际方法无显著性差异。该法简便快速,稳定可靠,重现性好,可应用于进出口铁矿、锰矿、金属锰粉和水泥等产品的检验中。     

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.     

贫锰银矿选矿工艺的探讨

河北省涿鹿县锰银矿,属氧化贫锰银矿.寻求合适的选矿工艺,将矿石中的锰银富集,达到冶炼的要求,是本文探讨的主要内容.采用强磁—浮选工艺流程试验,取得了满意的效果。锰银混合精矿含银496.2g/t,含锰30.42%;银回收率72.75%,锰回收率74.685%;Mn/Fe、P/Mn 均符合要求.