低品位硫铁矿精选试验研究

为提高硫铁矿烧渣的铁品位,实现硫铁矿资源的充分利用,对W（S）约为17％和21％的低品位硫铁矿分别进行了实验室和工业精选试验。工业试验结果表明,精选后的硫精矿平均W（S）为51．09％,硫回收率达90．85％;该精矿经沸腾焙烧后,获得平均W（Fe）65．11％、W（S）0．21％的铁精矿,符合炼铁原料标准。     

某含铁铅锌尾矿中铁分离试验研究

以某含铁铅锌尾矿为研究对象,通过对铅锌尾矿磁化焙烧时碳粉用量、温度、时间以及磁场强度最佳条件的研究,提出从铅锌尾矿中分离铁元素的合理方案,探讨铅锌尾矿中铁元素二次利用的可能性。试验结果表明,磁化焙烧时最佳碳粉用量为20%、焙烧温度为750℃、焙烧时间为80 min、磁场强度为256 kA/m,在此条件下所得精矿的铁品位为58. 44%,回收率为16. 98%。     

Simultaneous extraction of gold and zinc from refractory carbonaceous gold ore by chlorination roasting process

A novel process based on chlorination roasting was proposed to simultaneously recover gold and zinc from refractory carbonaceous gold ore by using NaCl as chlorination agent. The effects of roasting temperature, roasting time and NaCl content on the volatilization rates of gold and zinc were investigated. The reaction mechanism and the phase transition process were also analyzed by means of SEM, EDS and XRD. The results demonstrated that under the optimal conditions of NaCl content of 10%, roasting temperature of 800 °C, roasting time of 4 h and gas flow rate of 1 L/min, the rates of gold and zinc were 92% and 92.56%, respectively. During low-temperature chlorination roasting stage, a certain content of sulfur was beneficial to the chlorination reactions of gold and zinc; and during high-temperature chlorination roasting stage, the crystal structure of vanadium-bearing mica was destroyed, and the vanadium-containing oxides were beneficial to the chlorinating volatilization of gold and zinc. Eventually, the chlorinated volatiles of gold and zinc could be recovered by alkaline solution.     

焙烧高岭土催化剂对催化甲醇制二甲醚性能的影响

为了考察高岭土焙烧前后性能的变化,将高岭土分别在200℃、400℃、600℃、和800℃进行焙烧,得到焙烧高岭土催化剂样品,并对催化剂进行TG-DTA、XRD和SEM等的分析及活性测试.结果表明,高岭土经过高温焙烧后转变为偏高岭土,高岭土的特征峰消失,同时孔道明显增多,甲醇转化率、二甲醚选择性和收率均提高.     

贵州天柱重晶石回转窑还原焙烧生产工艺研究

中国重晶石资源储量丰富,为科学合理利用,避免重晶石开发过程中浪费,采用?3.2 m×60 m回转窑还原焙烧处理贵州天柱重晶石,考察了焙烧温度、抛煤对重晶石还原效果的影响。结果表明,当高温区温度为1 050~1 200 ℃、窑尾温度为500~600 ℃、窑头温度为750~850 ℃、回转窑转速为0.20~0.40 r/min、处理量为15~20 t/h、吨矿耗煤为191.64 kg时,获得粗钡中硫化钡质量分数为70.5%、粗钡浸出率为91.3%的良好指标,焙烧矿石及浸出考核指标均合格,对合理利用中国储量巨大的重晶石矿资源具有重要的现实意义。     

200 kA电解槽不大修多次焙烧启动技术的工业实践与探索

针对电解槽局部破损问题，详细介绍停槽、刨炉、补槽、焙烧及启动等过程及经验。通过对电解槽炉膛、炉侧局部破损部位进行修复，二次启动后大大延长了电解槽寿命，有效地利用了资源。     

Investigation of Efficient Conditions for Oxidative Roasting of Chromite Ore to Produce Potassium Chromate with KOH Additive

A method of producing potassium Chromate directly from chromite ore and KOH was investigated. The chromium recovery was >90% after roasting at 800°C for 3 hours. The KOH‐to‐ore weight ratio was 1.2:1 and the ore‐to‐recycling residue weight ratio was 1:1. Production from the roasting process was easy to leach and about 100% of Chromate could be recovered through a treatment at 30°C for 30~40min with a water/solid ratio of 5:1. The obtained Chromate solution was purified by addition of conventional compounds.     

粒度对钒渣焙烧转化率的影响

介绍了攀钢生产氧化钒所用钒渣的粒度分布及不同粒度钒渣的化学成分,研究了钒渣粒度对钒转化率的影响规律,优化了氧化钒的生产工艺。在钒渣粒度为80～160目,钒渣:尾渣之比为10:6,碱比为1.4的条件下焙烧熟料钒,其转化率达到86%。     

镁质碳酸盐岩微细浸染型金矿原矿焙烧试验

提出了原矿焙烧—氰化提金工艺处理某镁质碳酸盐岩微细浸染型金矿。试验表明,在原矿粒度-0.074mm占80%,焙烧温度650℃,焙烧时间1h,焙砂再磨粒度-0.038 mm占90%,NaCN用量3kg/t,液固比L/S=2,氰化时间36h的最佳条件下,渣含金降至1.92g/t,金浸出回收率达到94.90%。对300t/d规模原矿焙烧项目的经济评估表明该工艺经济效益显著。     

高硫铝土矿粗粒径焙烧脱硫及其溶出性能

分别对盘磨(粒径830μm占75%)和球磨(粒径75μm占85%)的一水硬铝石型高硫铝土矿进行焙烧脱硫处理,并与原矿进行溶出对比试验研究。结果表明,在700℃焙烧30min后,盘磨矿与球磨矿的硫含量分别从2.33%降至0.68%与0.64%,可以满足氧化铝生产工艺要求。当溶出条件为苛碱浓度245g/L、溶出温度260℃、石灰添加量8%、溶出时间60min时,焙烧矿氧化铝的溶出率提高了3.0~4.5个百分点。