新钢锰铁高炉使用进口锰矿的生产实践

新钢锰铁高炉使用进口锰矿始于1984年。目前，进口锰矿用量已占新钢锰铁高炉入炉锰矿总量的40％以上，为改善锰铁高炉技术经济指标、降低高炉锰铁成本、提高产品质量和企业经济效益发挥了重要作用。     

最近荣获国家发明奖的炼铁项目

1.高炉二步法用贫锰矿炼锰铁新工艺(三等奖) 由新余钢铁厂、钢铁研究总院和北京钢铁设计研究总院研究成功的“高炉二步法用贫锰矿炼锰铁新工艺”,解决了高炉用贫锰矿直接炼高牌号锰铁的技术问题.高炉二步法生产优质锰铁,工艺稳定、可靠,锰铁含量达到78%,锰元素的回收率比电炉法冶炼提高8.9%.1979年至1983年,已用该工艺生产高牌号锰铁2.7万吨,除供国内使用     

有计划地生产优质高炉锰铁所需的富锰渣

我国高炉锰铁生产能力很大,但由于受锰矿质量不高因素的影响,目前高炉锰铁标准不高。因此,调整炉料结构,生产优质富锰渣代替部分富锰矿配料入炉冶炼高牌号锰铁,它对于提高锰铁标准,争取市场,提高经济效益,是可取的。     

贫锰矿用高炉二步法生产优质碳素锰铁

高炉二步法用贫锰矿可以生产质量达到部颁标准的各种牌号的碳素锰铁,也可以为转炉吹炼中碳锰铁提供需要的合格碳素锰铁水。高炉各项经济技术指标先进,锰铁中含锰量可达78％以上,磷小于0.25％。二步法的总能耗与电炉生产大体相当,成本低于电炉碳素锰铁。二步法扩大了贫锰矿的使用范围,为使用贫锰矿冶炼优质锰铁开辟了一条新途径。     

提高风温促进锰铁高炉节焦增铁

高炉锰铁是炼钢所需用最为广泛的铁合金原料之一。由于我国使用的锰矿均为贫锰矿,在现有条件下,为了提高高炉冶炼锰铁的技术经济指标,节焦增产锰铁,除在原料,操作制度方面进行改进外,根据冶炼锰     

热装冶炼中炭锰铁的试验

上海铁合金厂从1961年开始利用小高炉处理贫锰矿生产富锰渣,供给电炉冶炼硅锰合金和中低炭锰铁。十多年来,我们围绕贫锰矿的合理利用,开展群众性的科学实验和综合利用活动,取得一定成果。热装冶炼中炭锰铁的试验就是其中一项。搞这项试验的目的有三:①用户对中、低炭锰铁的需求成倍增加,矿山愈采愈贫,能提供的富矿远远不能满足需要,用贫锰矿生产中炭锰铁成为一个新课题。②生产中炭锰铁的旧工艺流程分     

新钢高熟料比冶炼高炉锰铁效果分析

国内锰矿资源现状和高炉锰铁冶炼特点决定了高炉冶炼锰铁适宜使用高碱度烧结锰矿。新钢锰铁高炉熟料比曾长期在６０ ％ ～６５ ％ 徘徊。１９９６ 年,新钢在１ 号锰铁高炉进行了高熟料比冶炼试验,熟料比由６０ ％ 逐步提高到１００ ％ ,获得了增产节焦降低成本的好效果。目前,新钢锰铁高炉已按８０ ％ ～９０ ％ 熟料比组织生产。     

配用部分进口锰矿提高高炉锰铁经济效益

我国高炉锰铁的产量虽占高碳锰铁总量的80％以上,但由于我国贫锰矿多,富锰矿少,加上锰的选矿技术目前在经济上还存在一定的问题,致使未经处理的原矿在高炉料     

锰矿高炉提高锰回收率途径的探讨

本文通过对湘潭锰矿锰铁高炉和国内有关锰铁高炉生产实践的分析比较,结合有关院校的理论研究成果,探讨了提高锰铁高炉锰回收率的途径。     

锰铁高炉降低消耗提高经济效益的实践

高炉冶炼锰铁时,由于锰不能全部进入合金,加上锰矿价格十分昂贵,因此,除降低焦比外,努力提高锰的回收率,降低锰矿消耗,对增加经济效益具有重要意义。本文试就我厂锰铁高炉在灵川会议以后     

浅析锰矿石的质量对锰铁产品的影响

剖析了锰矿石的质量对高炉冶炼锰铁的重要性.通过理化分析、生产统计数据的证实和长期生产实践的经验,充分说明锰矿石的质量与锰铁产品间的关系,有利于矿山与铁合金厂家相互间的了解,并使双方得到互助互利。     

Improved manganese extraction in the production of manganese ferroalloys

In the production of manganese ferroalloys from ore, about 50% of the manganese in the ore is lost. The manganese lost with the enrichment-slag tailings may be returned to the production of manganese ferroalloys by dithionate method of enrichment of the slurries. A technology is developed for the production of high-carbon ferromanganese from concentrate obtained by the chemical enrichment of tailings slurries. Low-phosphorus Mn slag is used in the production of ferrosilicomanganese and refined manganese ferroalloys. A method is described for alloying hot metal with manganese from slag during the production of lowand medium-carbon ferromanganese. Processes are developed for the production of medium-carbon ferromanganese by mixing ore–limestone melt with high-carbon ferromanganese and removing the phosphorus from Mn-bearing melts by bubbling with CO. The degree of phosphorus removal (70–90%) depends on the bubbling time. By means of improved production of manganese ferroalloys and extraction of manganese from slag and slurries, the manganese extraction may be significantly increased.     

Studies on the Extraction of Manganese from Sea Nodule Residue as Ferrosilicomanganese

Most of the extraction processes developed for the polymetallic sea nodules concentrated mainly on the recovery of strategically important metals viz. Cu, Ni and Co. The residue generated in such processes is quite high enough to upset the environmental balance for industrial scale operation. The economics of the process too cannot be favourable if manganese in the residue is not recovered. In this study an attempt has been made to utilize this residue, containing appreciable amount of manganese (about 20%) for producing ferrosilicomanganese, an important ferroalloy primarily used for deoxidation in the steel industry, through smelting process. In order to have an alloy of standard grade, the residue is enriched in its manganese content, by blending it with ferromanganese slag. Bench scale studies indicate that it is possible to produce ferrosilicomanganese, of the grade required by the steel industry, by reduction smelting of the sea nodule residue with ferromanganese slag. Metal recovery, however, was less because of metal entrapment.     

高炉锰铁水渣变黑原因及其对水泥生产影响的探讨

湘潭锰矿的锰铁高炉水渣年产量约20万t,属碱性高炉水渣,具有较高的活性。它是水泥生产中的重要廉价原料。由于高炉水渣长期堆放于露天场地容易变黑结块,水渣活性大幅度降低,影响水泥产品的质量。因此,应尽量避免将水渣长期堆放氧化。     

锰铁中锰和磷的分步测定

锰铁中锰和磷的含量是锰铁分级的主要指标,以往锰铁中锰和磷的含量测定,需要分别采用三价锰滴定法和钼蓝分光光度法,测定过程繁琐,冗长。实验采用一次取样,硝酸-氢氟酸-高氯酸溶解试样,加入过氧化氢将二氧化锰还原为锰(II)的方式制备母液,分别用EDTA滴定法测定锰铁中锰含量,磷铋钼蓝分光光度法测定锰铁中磷含量,建立了对锰铁中锰和磷的分步测定方法。对测定锰的条件进行了优化,结果表明,通过加入三乙醇胺-酒石酸钾钠溶液可掩蔽试液中的铁、铜、铝、钛;采用锰铁标准物质进行试验,结果表明,以甲基百里香酚蓝为指示剂时,测定结果和认定值相吻合,且终点变色是从蓝色变为浅红色,更易观察;加入30mL无水乙醇、25mL 80℃左右的热水可解决指示剂僵化的问题。对磷含量测定中砷和残余硅的干扰消除方法进行了探讨,结果表明,砷的干扰可以通过加入硫代硫酸钠-亚硫酸钠溶液消除,残余硅的干扰可以通过加入酒石酸钾钠溶液消除。按照实验方法测定锰铁试样中锰和磷,锰测定结果的相对标准偏差(n=8)小于0.30%,磷测定结果的相对标准偏差(n=8)小于4.0%。方法应用于锰铁标准物质中锰和磷的测定,锰测定结果的相对误差绝对值小于0.25%,磷测定结果的相对误差绝对值小于4.0%。     

微波加热含碳锰矿球团冶炼高碳锰铁的研究

对微波加热含碳锰矿球团冶炼高碳锰铁进行了试验研究,探明配碳系数、炉渣碱度对锰回收率的影响。结果表明,采用微波加热含碳锰矿料球,可以冶炼出符合要求的高碳锰铁合金。配碳系数及炉渣二元碱度对锰元素回收率影响显著,当配碳系数为1.4、炉渣二元碱度为2.0时,锰元素回收率最高可达90%以上。当配碳过量时,锰元素回收率下降明显。     

锰铁熔体脱磷热力学分析

热力学分析表明,以氧化钡为主的脱磷剂,在满足扩散动力学的条件下,温度愈低,脱磷率愈高;硅含量愈低,愈有利于脱磷;碳含量降低,锰活度将增加,不利于氧化脱磷和保锰。碳含量高将抑制钙的还原脱磷作用。对高碳锰铁,宜采用氧化脱磷。对精炼锰铁,宜采用还原脱磷。     

Decarburization Thermodynamics of High-Carbon Ferromanganese Powders During Gas-Solid Fluidization Process

 Thermodynamic conditions of reactions between high-carbon ferromanganese powders and gas decarbonizers like O2, CO2 and water vapor were studied by thermodynamic calculation. In O2, CO2 and water vapor atmosphere, high-carbon ferromanganese powders were decarburized in a fluidized bed. When the temperature is respectively higher than 273, 1226 and 1312 K, the gas-solid decarburization reaction will occur between ferromanganese carbide on the surface of the high-carbon ferromanganese powders and different gas decarbonizers. Since metal manganese is easy to be oxidized by O2, CO2 or water vapor, the decarburization reaction will transfer into a solid-solid phase reaction of ferromanganese carbide and ferromanganese oxide, promoting external diffusion of carbon to achieve a further decarburization of high-carbon ferromanganese powders.     

Inclusions in commercial low and medium carbon ferromanganese

The microstructures of commercial low and medium carbon ferromanganese have been studied by optical microscopy and electron microprobe techniques. Element analysis and mapping have been performed on impurities in the matrix and nonmetallic inclusions present. The results show that the most common nonmetallic inclusion is managanese oxide, followed by complex compounds of managanese oxide, silicon oxide, and manganese sulfide. The different inclusions have been assessed according to the SS 111116 method. It follows that over 85 pct of the present nonmetallic inclusions are manganese oxides and that the amount of manganese oxide inclusions is inversely proportional to the carbon content in standard refined ferromanganese.     

实现高碳锰铁降本增效新途径

针对国内高品位富锰矿资源的严重缺乏,而低品位的锰矿资源储量较多的情况,通过对高碳锰铁生产工艺基础理论的研究及分析,提出了工艺配料上的新途径。通过改变配料计算依据,优化料批配比,实现了生产78^#高碳锰铁合金的成本节约。