硫酸渣磁选获取铁精矿粉实验研究

采用氧化脱硫、进化焙烧及湿式磁选工艺路线，处理硫酸渣后所得精矿粉其总铁品位提高，硫、磷含量降低，基本满足工业炼铁原料要求。     

硫酸渣磁选获取铁精矿粉实验研究

采用氧化脱硫，磁化焙烧及湿式磁选工艺路线，处理硫酸渣后所得精矿粉其总铁品位提高，硫，磷含量降低，基本满足工业炼铁原料要求。     

化学选矿用于处理黄铁矿烧渣

介绍了一种处理黄铁矿烧渣的新方法——化学选矿法。该方法的突出特点是既除去了硫酸渣中的残余硫，又富集了铁。且工艺简单、成本低．配合磁选工艺，用于处理含铁5685％、含硫0、96％的烧渣时，可获得铁精矿品位61.04％、含硫0.34％、铁回收率95．87％的良好指标。     

硫铁矿烧渣资源综合利用的研究与实践

介绍了国内外硫铁矿烧渣资源综合利用状况并分析几种常用工艺存在的问题.黄麦岭磷化工公司研究和实践表明,选矿-铁球团矿工艺优于选渣-铁球团矿工艺.公司建成1套100 kt/a全硫铁矿烧渣制铁球团矿装置,用选矿后w(S)48%以上的硫精矿焙烧产生的TFe约64%烧渣作为铁球团矿原料.2005年公司生产铁球团矿75 kt,经济效益和环境效益显著.     

硫酸烧渣综合回收磁选探索试验

为了探索利用硫酸烧渣分离铁精矿的可能性，对某硫酸厂的4种硫酸烧渣样品进行了磁选探索试验。试验结果表明，对于含铁硫酸烧渣，直接采用磁选，富集效果不佳；经过分散处理后对铁的富集会有明显改善；磁选对于降低硫酸烧渣的含硫量效果明显。经过还原处理的样品获得了较好的指标，铁品位54．16％，回收率92．46％，可以作为炼铁的低品位原料或配料使用。     

江铜-瓮福硫铁矿烧渣综合利用生产实践

江铜-瓮福400 kt/a硫铁矿制酸装置酸原料硫精砂硫含量高、砷、氟含量低,针对硫铁矿烧渣铁含量高[w（Fe）〉55%]的特点,采用硫精砂选矿富集-返渣配高品位硫精砂焙烧副产高品位烧渣的综合利用方案,烧渣w（Fe）在62%以上、有效硫w（S）在0.3%以下,完全满足炼铁原料质量要求。近一年多的生产实践表明,江铜-瓮福硫铁矿烧渣综合利用是成功的,硫酸装置各项工艺指标正常。w（Fe）62%烧渣产量达到191 kt/a,经济效益可观。     

从黄铁矿烧渣中回收铁的新工艺

硫铁矿焙烧后矿物晶形被破坏，质地疏松，呈微细粒嵌布，属难选矿物。采用简单的弱磁选和重选方法不能获得理想的分选指标。苏州硫酸厂烧渣采用细磨─酸洗─弱磁选─反浮选联合流程，可以从含铁５２．１５％的烧渣中分离出含铁５９．７５％的铁精矿，总回收率８２．７２％。为充分利用烧渣提供了新的途径。     

硫铁矿烧渣资源的综合利用

介绍国内外硫铁矿烧渣资源综合利用的技术进展。从国内外的研究和实践来看,选矿富集技术回收烧渣中铁资源在技术经济上优于烧渣选铁技术。分析选矿富集技术的几个关键问题,如选矿工艺、浮选硫铁矿品位、硫回收率、尾矿处理等,并探讨烧渣中有价金属资源的回收和由高品位烧渣制铁球团矿,指出选矿富集技术回收烧渣中铁资源是一项值得在行业内大力推广的技术。     

硫铁矿烧渣的开发利用

焙烧硫铁矿制硫酸，每产一吨硫酸均产生0．7－1吨烧渣，不仅占用大片堆放场地，造成地表污染，堆放日久还会氧化成水溶性盐而污染地层水系。因此开发利用烧渣，化害为宝，是一项利国利民的举措。烧的主要成分是铁，带以Fe2O3和Fe3O4的形式存在，一般含铁总量约40－60％，其余为钙、铝、锌、镁、硫等组分。所以，烧渣的利用应以开发含铁产品为主。     

硫酸烧渣中铁浸取条件的研究及应用

以硫酸烧渣、废酸为原料制取铁系化工产品。通过硫酸烧渣的活化焙烧及硫酸浓度、固液比、浸取时间等关键工艺条件的研究，得到最佳浸取条件：即烧渣与活化剂质量配比4：1，固液比0．25～0．30g／mL，反应时间40～50min，酸度50％～60％。渣中铁浸取率达到95％以上，浸取液可以直接用于制备铁系产品。     

硫铁矿烧渣富铁除硫研究

利用硫酸厂生产SO2后硫铁矿残渣,用水洗溶解可溶性物质、磁选、球磨法富集铁,化学浸泡去除铁精矿中的硫,浓碱法浮选法去除二氧化硅等。经磁选、浮选等方法处理后,烧渣的含铁质量分数由42.4%提高到63.58%;含硫量由1.37%下降到0.12%。产品可用作炼生铁三级品原料。     

Desulphurization of a fluid coke similar to the Athabasca oil sands coke

Almost complete desulphurization of a high-sulphur fluid coke was achieved by impregnating the coke with suitable alkaline reagents followed by high-temperature calcination in an inert atmosphere and subsequent leaching of the coke to remove soluble metal sulphides formed during calcination. Sodium hydroxide and sodium carbonate were found to be the most effective bases. Sodium sulphide was detected in the calcined, non-leached coke by X-ray diffraction. Methane, carbon monoxide, carbon dioxide, ammonia and water, in addition to hydrogen sulphide, were detected in the gaseous product stream by gas chromatography. Flow rate of the inert gas and the particle size of the coke employed in this investigation had no effect on the extent of desulphurization. A maximum desulphurization was observed at a calcination temperature of 850 °C.     

云浮硫铁矿烧渣选矿试验

对云浮硫铁矿烧渣磨矿－弱磁选－阴离子反浮选试验流程、设备、工艺条件和试验结果作了介绍。在磨矿细度－２００目８８．４８％、原烧渣含铁品位４５．８７％的条件下，经磁－浮流程分选，获得综合铁精矿品位５５．４４％，回收率７７．９１％的指标。综合的尾矿品位含铁２８．５０％．     

Investigation of the redox performance of pyrite cinder calcined at different temperature in chemical looping combustion

As an industrial solid waste, pyrite cinder exhibited excellent reactivity and cycle stability in chemical looping combustion. Prior to the experiment, oxygen carriers often experienced a high temperature calcination process to stabilize the physico-chemical properties, which presented significant influence on the redox performance of oxygen carriers. However, the effect of calcination temperature on the cyclic reaction performance of pyrite cinder has not been studied in detail. In this work, the effect of calcination temperature on the redox activity and attrition characteristic of pyrite cinder were studied in a fluidized-bed reactor using CH₄ as fuel. A series of pyrite cinder samples were prepared by controlling the calcination temperature. The redox activity and attrition rate of the obtained pyrite cinder samples were investigated deeply. The results showed that calcination temperature displayed significant impact on the redox performance of pyrite cinder. Considering CH₄ conversion (80%–85%) and attrition resistance, the pyrite cinder calcined at 1050?℃ presented excellent redox properties. In the whole experiment process, the CO₂ selectivity of the pyrite cinder samples were not affected by the calcination temperature and were still close to 100%. The results can provide reference for optimizing the calcination temperature of pyrite cinder during chemical looping process.     

简论硼砂生产过程中的矿石煅烧

在采用碳碱法制备硼砂时,必须先对硼矿石进行活化煅烧。煅烧的目的是改变矿石结构,将矿石中难以用碳解方式分解的硼镁石高温转化为易于分解的遂安石。介绍了矿石煅烧的几种方法、矿石煅烧的温度范围、硼铁矿石的煅烧。指出粉体闪速煅烧因单套装置生产能力大且机械化程度高、煅烧温度及生产状况易于控制、产品熟矿粉质量好且稳定等诸多优点而具有发展前景;硼镁石转化为遂安石的温度范围为620~800 ℃,硼镁石中含镁愈高煅烧温度区间愈宽且偏高,含铁愈高煅烧温度区间愈窄且偏低;对于单纯的硼铁矿石,目前的煅烧方式不能使其结构发生改变。     

几种添加剂对石灰石固硫影响的研究

利用石灰石脱硫存在的最主要问题是脱硫率较低和吸收剂的利用率较低，为了解决这个问题，除了优化石灰石的煅烧和硫化工况外，添加剂常被用来改善石灰石的脱硫性能。选用两种不同含硫量的煤，与添加了不同比例SrCO3,BaCO3,Sr(OH)2,Ba(OH)2,K2CO3和KOH等六种化合物的石灰石均匀混合进行脱硫实验，分析了各种添加剂对石灰石脱硫性能的影响。     

煅烧温度对磁性铁钛复合氧化物微观结构及脱硝活性的影响

利用共沉淀微波法构筑新型磁性铁钛复合氧化物催化剂,研究了煅烧温度对其物性结构及NH₃-SCR脱硝性能的影响,揭示了钛掺杂对磁性γ-Fe₂O₃晶体高温热转化及其脱硝性能的优化机制。结果表明：当煅烧温度由300℃升至500℃时,磁性铁氧化物的比表面积、孔容先增大后减小,且较高的煅烧温度促使其γ-Fe₂O₃晶体逐步转变为α-Fe₂O₃晶体,导致磁性铁氧化物表面Fe²⁺和活性氧浓度增大,促使其NH₃-SCR脱硝性能降低;掺杂钛可提高磁性铁氧化物的热稳定性,抑制了高温煅烧下γ-Fe₂O₃晶体向α-Fe₂O₃晶体的不可逆转变和其孔隙结构的坍塌,增大了高温煅烧时磁性铁氧化物催化剂的比表面积和比孔容,合适的煅烧温度为400℃;该煅烧温度下,催化剂低温活性最佳,反应温度高于220℃、空速比60000h^-1时可获得80%以上的NO_x转化效率。     

硫铁矿烧渣提纯制铁精矿的试验研究

在研究硫铁矿烧渣性质的基础上，进行了烧渣提纯的磁选、重选和工艺流程的条件试验，原料预处理后磁选可制得TFe＞60％、回收率70％以上的铁精矿，可用作炼铁原料。     

高温煅烧脱除磷酸铁中硫的研究

磷酸铁是合成磷酸铁锂电池正极材料的主要原料,目前多采用硫酸亚铁和磷酸盐共沉淀方法制备。硫酸体系内共沉淀获得的磷酸铁中硫杂质含量较高,目前采用水洗方式脱除,吨磷酸铁洗水用量需60~100吨,硫酸盐废水处理成本高。为从源头削减磷酸铁脱硫过程产生的大量废水,根据硫酸盐高温分解的性质,提出磷酸铁高温煅烧脱硫新方法,开展了热力学可行性计算与高温煅烧脱硫动力学研究。结果表明,磷酸铁中硫元素主要以硫酸根形式存在,高温煅烧可有效促进含硫杂质分解,温度越高,脱硫效果越好。高温煅烧脱硫过程反应动力学级数为2,活化能为88.075 kJ/mol,属于化学反应控制。在温度1173 K、煅烧时间10 min的条件下,磷酸铁中硫杂质含量可降至0.01wt%以下。     

From waste to best: excellent desulfurization performance of spent FCC catalyst

Fluidized catalytic cracking (FCC) is an important link in heavy oil processing. Industrial FCC catalyst which mainly consists of molecular sieves, substrates and adhesives is used in large quantities every year. Spent FCC catalyst is one kind of hazardous solid waste that is hard to handle. In this paper, we used a spent FCC catalyst as a desulfurization adsorbent, and show that it displays advanced desulfurization property. Furthermore, regeneration experiment showed that calcination was an effective method to remove the sulfides adsorbed in spent FCC catalyst, after four cycles it still owned a high sulfur adsorption ability. The results of metal impregnation indicated that the high ability to remove sulfur in LPG was due to those metals deposited on WC. The sulfur removal further increased by calcination of the spent catalyst since carbon deposition on the catalyst surface which blocked the active sites was minimized by calcination, thus leading an increase in the number of active sites available.