有色金属产品价格旬报(8月下旬)

品种瓣蜘耀黝缨摹黝瓢馨馨黝鬃黝馨馨蒙成都电冶厂·············································……17500葫芦岛有色公司····································……17500铜陵有色公司··········································……17700江西铜业公司··········································……17800天津有色金属公司·················…     

有色金属产品价格旬报(10月上旬)

品种1林电解铜元/吨成都电冶厂‘,..······························……14900株洲冶炼,‘·······”·························一15500葫芦岛锌I’·································……15200铜陵有色公司······························……15100太原铜业公司······························……巧300武汉有色公司····”·····················…     

有色金属产品价格旬报

品种藻蘸薰瓢珊黝瓢瓢黔耀瓤瓢黝黝黝黝成都电冶厂··············································、·……16800葫芦岛有色公司···········································,·…17038铜陵有色公司········,·································……16850江西铜业公司··········································……16900天津有色金属公司·······…     

有色金属产品价格旬报(1月上旬)

天津有色公司·································……23500铜陵有色公司·································……17300四Jll铜镍有限公司············……,.’’······……18400太原铜业公司································……‘17500金川公司·.············.························……18000天津有色金属公司······················“···……1…     

《炼铁》1991年总目次(总第10卷第49～54期)

(主要文章)耐火材料与高炉的长寿高效·························································……李楠(1.1)本钢1号高炉的长寿技术····························································……周汝等(1 .6)首钢4号高炉强化冶炼的初步分析················································……李马可(1 .8)宣钢焦炭抗碱性研究···········…     

有色金属产品价格旬报(6月上旬)

铜陵有色公司···,······························一1 7900四川铜镍有限公司”·,“····“·········t·····……18000太原铜业公司····.····························”·…18000金川公司··········.···············,············……18000江西铜业公司································……’18000沈阳冶炼厂···”············……,····”······……1…     

有色金属产品价格旬报

1660016149170001520016800葫芦岛锌厂…铜陵有色公司武汉有色公司江西铜业公司天津有色金属公司······························……16400白银有色金属公司······························……16015大冶有色金属公司······························……16290中条山有色金属公司···························……16700水口山有色金属公司···························……16800烟台鹏晖铜…     

《工业炉》1980年总目录

(第期)自身予热烧咀研制阶段总结·························································,···········……(1)空心墙、壳与烟道炉底—关于炉子结构的研究····························4·············……(10)营口中板厂加热炉燃耗的分析研究,··········································,················……(16)流动粒子电炉炉温失控分析·······…     

1980年《稀土》总目录

白云鄂博矿综合回收稀土的选矿研究·············································……张新民(1.1)稀土萃取性质的递变规律····························································……杨燕生(1.7)煤油大孔阳离子交换树脂分离稀土的研究········································一王耕霖(1.22)稀土氢氧化物中饰的空气氧化·························…     

有色金属产品价格旬报(9月上旬)

成都电冶厂,…,,…““.”“..…‘…,…,。。。.。。。“14800株洲冶炼厂·································……15400葫芦岛锌厂·································……15450铜陵有色公司·······························““·15000太原铜业公司····“··,·····················……15800武汉有色公司··“·············“··“·······一巧100水口山矿务局···”········…     

Direct Reduction of High-phosphorus Oolitic Hematite Ore Based on Biomass Pyrolysis

Direct reduction of high-phosphorus oolitic hematite ore based on biomass pyrolysis gases(CO,H_2,and CH_4),tar,and char was conducted to investigate the effects of reduction temperature,iron ore-biomass mass ratio,and reduction time on the metallization rate.In addition,the effect of particle size on the dephosphorization and iron recovery rate was studied by magnetic separation.It was determined that the metallization rate of the hematite ore could reach 99.35% at iron ore-biomass mass ratio of 1∶0.6,reduction temperature of 1 100℃,and reduction time of 55 min.The metallization rate and the aggregation degree of iron particles increase with the increase of reduction temperature.The particle size of direct reduced iron(DRI) has a great influence on the quality of the iron concentrate during magnetic separation.The separation degree of slag and iron was improved by the addition of 15 mass% sodium carbonate.DRI with iron grade of 89.11%,iron recovery rate of 83.47%,and phosphorus content of 0.28% can be obtained when ore fines with particle size of-10 μm account for 78.15%.     

Effect of Sodium Sulfate on Direct Reduction of Beach Titanomagnetite for Separation of Iron and Titanium

The effect of sodium sulfate on direct reduction of beach titanomagnetite,followed by magnetic separation,to separate iron and titanium was investigated. Direct reduced iron( DRI) with a high Fe content,low TiO_2 content and low iron recovery was obtained after adding sodium sulfate. When the sodium sulfate dosage was increased from 0 to 10 mass%,the Fe content of the DRI increased from 90. 00 mass% to 93. 55 mass% and the TiO_2 content decreased from 1. 27 mass% to 0. 70 mass%. The reduction mechanism of sodium sulfate was investigated by X-ray diffraction( XRD) and scanning electron microscopy( SEM) with energy dispersive spectrometer( EDS). Results revealed that the metallic iron grains in the reduced ore with sodium sulfate were larger than those in the ore without sodium sulfate. Sodium sulfate promoted the migration of iron as well as the accumulation and growth of metallic iron grains by low-melting-point carnegieite and troilite formed in the redox system. Low-melting-point carnegieite decreased the melting point of the system and then promoted liquefaction. Troilite could decrease the surface tension and melting point of metallic iron grains.     

SiO2、Na2CO3对预还原烧结过程中气化脱磷的影响

白云鄂博铁精矿磷含量较高为0.08%(质量分数),且磷元素主要以氟磷灰石的形式存在。基于前期白云鄂博矿磷的赋存状态及白云鄂博矿预还原烧结工艺对脱磷影响的研究,同时为了开发利用其他中、高磷铁矿,研究了白云鄂博铁精矿预还原烧结过程中磷的气化脱除机制。利用FactSage热力学软件、XRD、SEM-EDS对比分析不同SiO2、Na2CO3添加量对预还原烧结过程中气化脱磷率、金属化率以及物相转变的影响。结果表明:最佳的SiO2、Na2CO3添加量(质量分数)分别为3%、1%,对应的脱磷率为31%,金属化率为96%,实现了预还原烧结过程中磷的有效脱除,进一步明确预还原烧结脱磷机制,为以后中、高磷铁矿脱磷的研究指明了方向。     

陕西某次生岩型红柱石矿的生产流程及产品品质

次生石英型红柱石矿,矿石呈浅红色,矿物颗粒细小,分布均匀,红柱石含量高,实际入选矿石品位多在33%以上,矿石中含有极少量金红石、褐铁矿、黄铁矿等,是精矿中TiO_2和Fe_2O_3的主要来源,通过细磨磁选可以减少精矿中Fe_2O_3含量。实际生产流程为磁选重选联合流程,流程简单,不添加任何化学药剂,也不需要尾矿库,磁机分离的铁矿物和尾矿混在一起都是生产水泥的好原料。生产的产品分粒料和粉料两大类六个品种,以粉料为主,通过多次反复除铁,大大降低了粉料中铁的含量,生产的粉料质量基本符合行业标准。     

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.     

高铝高硫低品位铁矿粉还原熔分制备珠铁

 基于转底炉珠铁工艺,以一种高铝高硫低品位铁矿粉和无烟煤为原料,在实验室条件下进行了还原熔分试验研究,考察了温度、配碳量、碱度和添加剂对高铝铁矿含碳球团还原熔分行为的影响,并分析了碱度和添加剂对珠铁中硫质量分数的影响。试验结果表明,温度为1 350～1 450 ℃时,空白球团熔分效果较差,金属铁渗碳量较低;提高配碳量,金属铁渗碳量略有增加,但熔分效果仍较差;碱度增加会促进球团还原,1 450 ℃时,碱度为0.6、0.8、1.0、1.2的球团可以实现渣铁良好分离,珠铁中硫质量分数逐渐降低,碱度为1.2时降低较明显;Na2CO3配比增加,球团熔分也会逐渐变差,1 450 ℃时球团基本均可以熔分,珠铁中的硫质量分数逐渐降低,但脱硫效果不明显;当碱度为1.2、Na2CO3配加为8%、CaF2配加为4%时,球团可以在1 450 ℃下良好熔分,脱硫效果显著,珠铁中硫质量分数为0.085%,脱硫率达到96.5%,所得珠铁基本满足炼钢要求。     

Influence of Mechanical Activation on Acid Leaching Dephosphorization of High-phosphorus Iron Ore Concentrates

High pressure roll grinding (HPRG)and ball milling were compared to investigate the influence of me-chanical activation on the acid leaching dephosphorization of a high-phosphorus iron ore concentrate,which was man-ufactured through magnetizing roasting-magnetic separation of high-phosphorus oolitic iron ores.The results indica-ted that when high-phosphorus iron ore concentrates containing 54·92 mass% iron and 0·76 mass% phosphorus were directly processed through acid leaching,iron ore concentrates containing 55·74 mass% iron and 0·33 mass%phosphorus with an iron recovery of 84·64% and dephosphorization of 63·79% were obtained.When high-phosphor-us iron ore concentrates activated by ball milling were processed by acid leaching,iron ore concentrates containing 56·03 mass% iron and 0·21 mass% phosphorus with an iron recovery of 85·65% and dephosphorization of 77·49%were obtained.Meanwhile,when high-phosphorus iron ore concentrates activated by HPRG were processed by acid leaching,iron ore concentrates containing 58·02 mass% iron and 0·10 mass% phosphorus were obtained,with the iron recovery reaching 88·42% and the dephosphorization rate reaching 88·99%.Mechanistic studies demonstrated that ball milling can reduce the particle size,demonstrating a prominent reunion phenomenon.In contrast,HPRG pretreatment contributes to the formation of more cracks within the particles and selective dissociation of iron and P bearing minerals,which can provide the favorable kinetic conditions to accelerate the solid-liquid reaction rate.As such,the crystal structure is destroyed and the surface energy of mineral particles is strengthened by mechanical ac-tivation,further strengthening the dephosphorization.     

Phosphorus Removal of High Phosphorus Iron Ore byGasBased Reduction and Melt Separation

A large deposit of high phosphorus iron ore in China contains an average of 1.2% phosphorus and 50% iron and it has not been utilized. In current work, a novel process to remove phosphorus of the ore has been proposed. The novel process has been demonstrated theoretically and experimentally. The theoretical work (numerical simulation) was carried out with HSC chemistry package and a mathematical model developed using the coexistence theory of slag structure. Gas-based reduction and melt separation experiments were then designed and conducted. Simulation results shows that that all iron compounds in the ore could be reduced to metallic iron using CO/ H2 under temperature above 1000K and the yield of iron is more than 90% under either atmosphere; P can not be reduced and exists as Ca3(PO4)2; in the melt separation process, iron metallization ratio, melting temperature and CaO-adding ratio affect the phosphorus partition between slag and molten metal and CaO-adding ratio is the most distinguished parameter. Results of gas-based reduction agreed well with the simulation except for iron metallization ratio being less than predicted. This difference is mainly attributed to kinetic condition. Results of melt separation experiment show most P is left in the slag sample and some P in the metal sample exists as slag inclusion..     

Phosphorus Removal of High Phosphorus Iron Ore by Gas-Based Reduction and Melt Separation

A new method (gas-based separation plus melt separation) has been proposed to remove phosphorus of the high phosphorus iron ore which was 1.25% of phosphorus content and 50.0% of iron content.HSC chemistry package and the coexistence theory of slag structure were adopted for theoretical analysis.The gas-based reduction was carried out using a fixed bed reactor and the ore sample of 80 g with an average particle size of 2 mm were reduced using CO or H2 at temperature of 1073 K for 5 hours.50 g of the reduced...     

煤中挥发分对热解过程的行为影响分析

较高的还原温度易造成结圈,使回转窑直接还原铁工艺发展受限,为此,需研究低温条件下煤中还原性气体释放和铁矿石的还原过程。通过热重分析仪-傅里叶红外光谱仪-质谱仪(TG-FTIR-MS)联用方法分析不同挥发分煤的热解特性和铁矿石还原过程。结果显示,高挥发分煤在热解过程中具有更加优越的反应活性,随着挥发分的提高,煤中还原性气体的释放温度更低,释放含量更高。整个热解过程中有机气体主要为CH₄、CH3+碎片、苯、甲苯以及同系物;无机气体为SO₂、CO、CO₂、H₂O。高挥发分煤种的还原性气体CO释放温度较低。此外,热解过程中,高挥发分煤种表观活化能更低,热解过程更容易进行;相较于无烟煤,采用烟煤还原铁矿石时还原反应进程更快,还原过程更加彻底。为此,采用高挥发分煤种进行煤基还原将会为有效降低煤基还原温度提供新思路。