微硅粉增密仓料位适时监测装置的探讨

为可靠监测硅微粉增密料仓输料料位,文章针对微硅粉这一特殊介质及其增密处理的特定生产工艺,通过在微硅粉气力输灰时,对其增密仓料位进行在线适时监测装置进行设计,解决了微硅粉增密仓输料料位无可靠监测的现状,从而杜绝了因料位超限引起的输料管道堵塞等工艺问题。     

制备复合熔剂球重熔生产精炼硅铁合金技术研究

在应用选择性氧化原理生产精炼硅铁的成熟技术基础上,深入研究探索适用微硅粉、硅铁粉及部分冶金熔剂制备复合熔剂球,重熔与精炼生产精炼硅铁工艺。文章对此生产工艺进行热力学分析,并论述了其工业实施流程。重点解决低品位微硅粉和杂物混合较多,难以高价销售的硅铁粉,实现副产品综合回收利用以及提升产品附加值的目的。     

浅谈国内外微硅粉的应用发展现状

微硅粉作为工业硅和铁合金领域的常见副产物，我国仅2021年产量高达280万t。尽管微硅粉具有较好的火山灰活性，应用潜力大。但是由于技术、成本等原因，目前微硅粉的大规模开发利用还未找到合适的突破口，造成大量的微硅粉积压，给铁合金企业带来了较大的环保及场地费用压力。粉末状微硅粉的高效利用已成为行业迫切需要解决的难题之一。本文主要就近几年来国内外微硅粉在传统领域(水泥、混凝土、耐火材料领域)和新兴领域(橡胶、储能、分子筛合成和环保领域)的应用研发现状进行了综述，希望能为微硅粉的高效、资源化利用提供参考。     

微硅粉-碎硅石粉复合球团粒度组成对球团性能的影响

工业硅企业生产中产生大量微硅粉和碎硅石废弃物，通过制备微硅粉-碎硅石粉复合球团返炉冶炼，可以提高工业硅生产资源利用率，达到降本增效的目的。本文通过控制微硅粉-碎硅石粉复合球团的粒度组成来改善球团强度，最终得到强度满足生产要求的球团。当球团中微硅粉含量占比40%的优化条件下，微硅粉-碎硅石粉复合球团干球团落下强度15.5次，抗压强度2 197 N,热球团落下强度15.4次，抗压强度1 703 N。复合球团性能优越，满足生产要求。     

电熔氧化锆生产的节能环保技术研究

根据电熔氧化锆生产工艺的特点和实践经验,主要从熔炼工序、微硅粉收集、粉体加工工序等方面分析节能降耗的影响因素,指出提高节能减排效果的方法,以促进电熔氧化锆行业的技术进步和发展。     

微硅粉在国内外应用概述

微硅粉（硅灰）是从金属硅或硅铁等合金冶炼的烟气中回收的粉尘。本文对国内外微硅粉的回收和应用在混凝土、耐火材料、水泥生产等领域的情况进行了概述，并对微硅粉市场进行了调研，在此基础上进行了市场预测和前景展望。     

提高微硅粉中SiO_2含量的方法与实践

介绍了硅铁炉回收微硅粉的工艺流程,并通过不同原料的对比实验和旋风分离器的改造,达到了改善微硅粉成分的目的,提高了SiO_2含量。     

低碳低硅钢精炼渣脱硫的实验室研究

本文通过实验室研究,开发了LF炉脱硫精炼用低碳低硅精炼渣系.通过半球法熔点测试试验,确定渣系的合理成分配比,低碳低硅渣系的成分是高温氧化铝微粉(40%)、石灰(50%)、萤石(2%)、碳酸钡(8%).通过实验室低碳低硅精炼渣系脱硫试验得出,自配渣系与工厂里使用的AD粉渣系相比,两者的脱硫效果相当,均为79%左右.但自配渣系在增碳增硅方面,与工厂使用的AD粉渣系相比,增碳增硅量较少,使得自配渣系优于工厂使用的AD粉渣系,自配渣系基本达到低碳低硅钢的精炼要求.     

铸造铁生产炉外增硅实践

铸造铁生产时,为降低成本和提高炉况顺行度,常采用炉外增硅的方式达到生产高牌号铸造铁的目的;由生产实践数据得出硅粉的回收率,对影响回收率的因素分析;增硅经济分析。     

金属硅粉喷吹返包试验

为了使工业硅生产工艺过程中产生的超细金属硅粉提高利用率,采用压缩空气通过密闭管道将超细金属硅粉吹入硅精炼包,直接喷入高温硅液进行二次熔融返包,工艺参数选择碳棒插入300 mm深度、空气压力0.4 MPa、碳棒孔径50 mm时,其试验效果相对较好。     

Utilization of Dust from Silicon Production

Silicon production by the reduction of quartzite in furnaces is accompanied by copious dust emissions containing a high proportion of valuable silica (86%, on average). It is of great interest to capture that dust for reuse in the process. The dust captured in the gas-purification system consists of particles no larger than 120 μm, with a predominance of the 20–50 μm fraction. In order to use such dust in silicon production, it must be aggregated, so as to prevent its entrainment from the furnace by the gas fluxes. Since the batch pieces must be strong enough to withstand transportation, the binder employed is liquid glass with the addition of electrofilter dust from aluminum production, which contains tars (polyaromatic hydrocarbons). Strength tests of batch samples permit the recommendation of the following composition (by mass): 24–27% dust from silica production; 51–53% carbon reducing agent (a 1: 1 mixture of petroleum coke and charcoal); 4–5% silicon siftings; 14–15% binder (a 4:1 mixture of liquid glass and electrofilter dust from aluminum production). For such batch, the strength in drop tests is 82.5%, on average. Research shows that the batch pieces obtained by this method have a porous structure (45.5%) for the formation of a well-developed active surface and corresponding apparent density (1100 kg/cm³). That supports stable furnace operation. Trials in an HTF 17/10 high-temperature furnace yield an intermediate product containing more than 44 wt % silicon carbide. On that basis, such dust aggregates may be added to the main batch in silicon production.     

硅尘的应用现状及其开发前景

详细地论述了硅尘和特征、硅铁及工业硅生产现状及特点，介绍了硅尘应用的现状和合理利用硅尘的途径和方法，指出了硅尘应用的广阔前景。     

焦化煤焦系统烟尘治理实践

为治理焦化煤焦系统上下工序产生的烟尘,对焦炉出焦采用车载移动式除尘技术、干熄焦装焦增加烟尘活动盖板、运煤配煤及运焦倒焦实施水雾除尘、管道密封处理、布袋式除尘器改造等措施,除尘设备设施得到有效运行,2011年1～8月份工业粉尘排放量比去年同期减少1286.4t,职工工作环境得到有效改善。     

30 MVA硅钙炉的烟气净化和硅粉的回收利用

介绍了硅钙矿热炉烟气除尘技术及微硅粉尘的应用途径,利用双级旋风预处理器和正压袋式除尘器处理硅铁电炉烟气,运行稳定可靠,投资省,费用低,不仅解决了烟气环境污染问题,而且回收应用前景广泛的微硅粉,取得了较好社会效益和经济效益。     

高炉煤气高速外滤式脉冲清灰布 袋除尘的应用

高速外滤式脉冲清灰布袋除尘工艺用于高炉煤气的除尘 ,因其过滤风速高 ,清灰效果好 ,布袋寿命长 ,除尘效率高 ,改造投资少 ,见效快 ,优于的传统的内滤式加压反吹布袋除尘工艺 ,适合于现有内滤式布袋除尘器的改造 ,具有显著的环境效益、经济效益 .文章着重介绍该工艺设备的性能特点及系统的改造及应用状况 ,并对运行效果进行分析     

浅述硅铁生产烟尘的回收利用

浅述了硅铁生产烟尘的回收系统、二氧化硅微粉的性能、质量控制、综合利用情况。     

莱钢120t转炉烟气干法除尘工艺技术

莱钢120t转炉采用干法除尘工艺,该工艺由烟气冷却、净化回收及控制系统组成。其中,烟气净化回收系统由蒸发冷却器、静电除尘器、轴流风机、煤气切换站等组成。除部分主体设备外,蒸发冷喷嘴、静电除尘器高压电气设备、轴流风机及控制系统等关键设备从国外引进。生产实践表明。系统运行稳定,净化后的烟气含尘量仅为6．6mg／m^3,运行费用低。     

Comparison of inducible nitric oxide synthase gene expression and lung inflammation following intratracheal instillation of silica, coal, carbonyl iron, or titanium dioxide in rats

The pulmonary toxicity of the respirable dusts silica, coal, carbonyl iron, and titanium dioxide on alveolar macrophage (AM) and neutrophil (PMN) inducible nitric oxide synthase (iNOS) gene expression and nitric oxide (NO) production was investigated. Rats were intratracheally instilled with 5 mg/100 g body weight of silica, coal, carbonyl iron, or titanium dioxide. The dust particles averaged less than 5 microns in diameter. Bronchoalveolar lavage was performed 24 h later. Bronchoalveolar lavage cell (BALC) differentials, iNOS gene expression and NO production by BALC (measured indirectly as NO-dependent chemiluminescence), and lavageable lung protein levels were measured. Analyzed on an equal mass basis, silica, coal, and titanium dioxide dusts increased the production of iNOS-dependent NO by AM. Silica and titanium dioxide both increased the levels of iNOS mRNA while carbonyl iron and coal did not. Each dust caused an increase in PMN, indicating an inflammatory response. Carbonyl iron and titanium dioxide decreased the numbers of AM. Levels of acellular lavageable lung protein were increased by silica, carbonyl iron, and titanium dioxide. When exposure was normalized for an equal number of particles, the pneumotoxic dusts, silica and coal, caused more inflammation and NO production than the nuisance dusts, carbonyl iron and titanium dioxide. Therefore, it appears that particle number is a more appropriate metric of exposure than mass when comparing the relative pathogenicity of dusts of different sizes. Furthermore, since the potency of these dusts (on a particle number basis) to increase iNOS gene expression reflects their inflammatory and pathogenic potential, it is proposed that NO may contribute to the early inflammatory damage observed in the lung following dust exposure.     

低压脉冲布袋处理回转窑低温低硫含油烟气技术研究

现有两台中3.6×52M回转窑,使用重油、粉煤作为燃料,收尘设施为旋涡收尘器加电收尘器。回转窑正常生产时,进入电收尘器的烟气温度仅能达到140℃~160℃,无法满足设计所需的最低180℃的要求。导致电收尘器内部结构腐蚀,漏风率达到20%、收尘效率仅为80%,出口含尘超标,给后续制酸系统造成困难。通过技术改造,将电收尘改造为布袋收尘器,收尘效率提高至99.95%,出口含尘降低至30mg/Nm³,系统漏风率降低至3%,保障了系统稳定运行。