铝硅合金生产的能耗分析

将电热法和兑掺法生产铝硅合金所消耗的一、二次能源、各种原材料换算成一次能源标煤的形式,计算和分析铝硅合金生产的综合能耗,提出电热铝硅合金是一种节能产品,电热法生产铝硅合金是发展铝工业的捷径。     

永登铝业液态铝硅直接熔配铝硅合金项目试产成功

河南永登铝业有限公司自主研发的铝硅合金生产新工艺——利用液态铝硅直接熔配铝硅合金项目经过3个多月的试生产和工艺完善,项目宣告试产成功,经行业专家评价技术属国内首创。     

氯化锰去除铝硅合金中铁杂质的研究

针对电热法生产的一次铝硅合金经稀释精炼后需去除杂质铁,而直接加锰除铁造成了锰的损失,且锰的扩散较慢这一问题。探讨了用氯化锰代替单质锰去除铝硅合金中铁的可能性。结果表明,氯化锰能够与铝反应生成锰即氯化锰可以代替锰去除铝硅合金中的铁。     

利用炉料遗传性原理控制铝合金圆铸锭熔铸质量的探讨

在研究相关文献的基础上介绍了炉料中铝硅合金、铝硅合金用变质剂Sr、铝合金晶粒细化剂组织、电解铝液和重熔铝锭中含铁相的遗传性。提出了利用炉料遗传性原理进行铝合金铸锭熔铸生产的一些措施。     

氧化铝直接氯化电解法炼铝试验

一、引言 目前金属铝的生产、主要是靠霍尔—埃鲁法—冰晶石氧化铝熔融盐电解法。这种方法存在许多缺点:生产过程温度高,一般为950～970℃;电能消耗大,一般为16000～13000千瓦时/顿铝;电解质的侵蚀性大;单位设备的生产能力低。所以,人们对于新法炼铝的研究一直也没停止过。按照当前的资料,研究过的新炼铝方法有:炭热还原法,就是用碳直接还原铝矿石,生产出粗铝硅合金,然后用低价卤化物法从粗铝硅合金中提取纯铝,或是提取共晶铝硅;锰还原法(托思法);氯     

铸造铝硅合金的直接熔炼

通过对铝硅合金直接熔炼的研究，说明了铝硅合金直接熔炼的优点及操作的可行性，并指明了操作中应注意的问题。     

论我国钼合金剂的发展趋向

论述了结合我国钼资源特点，回收合钼废料制取钼复合合金剂；用硅—钙合金、硅格—铁代香铝粉作硅—铝热法冶炼钼铁的反应加速剂，利用碳质还原别，用高温固相渗碳还原法制取碳素钼铁及用真空冶金法制取高牌号高质量相铁等，是钼铁生产的新创举，是我国钼合企剂生产和发展趋向．采用氧化钼代替钼铁，直接合金化，冶炼合金钢和合金铸铁，是当前我国钼合金剂发展的主导方向．介绍了1995年1～11月，我国各类相制品出口概况．提出了建议．     

电热法生产铸造用共晶铝硅合金的能耗分析

介绍了电热法生产铸造用铝硅合金的工艺流程,同时对兑掺法和电热法生产铸造用铝硅合金的能耗进行了分析,结果表明：电热法生产共晶铝硅合金与兑掺法相比可节能5%以上,成本可降低700元以上。     

直接加硅法配制6063铝合金的工艺实践

本文作者在改进6063铝合金配料工艺过程中提出了直接加硅的工艺,通过试验探索了直接加硅法工艺中硅实收率与原铝温度、溶解时间、搅拌强度的关系,并选择合适的工艺使直接加硅工艺的硅实收率达到97%,有效降低了6063铝合金生产成本。前言阳泉铝业公司从2004年开始使用东正设备厂生产的同水平密排热顶铸造系统生产6063铝合金棒,在6063合金加硅工艺上,随着生产条件的不断变化,先后采用过使用AL-Si中间合金加硅法、速溶硅加硅法和直接加硅法。在刚开始生产6063铝合金棒时,为了培养配料工准确配料,公司从外购入AL-Si中间合金用于加硅,这个途径的特点是外购的AL-Si中间合金的Si含量稳定,配料简单,但是成本较高。随着配料工熟练程度的提高,也本着降低成本的思路,本公司开始用200公斤容量的石墨坩埚使用废铝、     

硅钙合金、硅钡合金中铝量的测定

本文介绍了一种硅钙合金、硅钡合金中铝量的测定方法。样品用硝酸溶解，氢氟酸挥硅，高氯酸冒烟，加入氯化钡溶液保持电解质平衡，用硼酸溶液去氟，强碱分离铁、锰、钒、铌等干扰元素，用过量的EDTA络合铝，通过调节酸度，用PAN作指示剂，用硫酸铜标准溶液返滴定来测定硅钙合金、硅钡合金中铝量。     

Silicon and aluminium interactions in haemodialysis patients

BACKGROUND: Aluminium toxicity in dialysis patients is well described. Aluminium has a close chemical affinity with silicon. Silicon may have a role in protection against aluminium toxicity. METHODS: We measured serum aluminium and silicon levels from haemodialysis patients from four different centres. RESULTS: Though no relationship was seen across all centres combined, in one centre there was a reciprocal relationship in patients on home haemodialysis (who did not require reverse osmosis). Median (range) aluminium levels were higher, 2.2 (0.4-9.6) micromol/l when serum silicon was less than 150 micromol/l, and lower, 1.1 (0.2-2.8) micromol/l when serum silicon levels were greater than 150 micromol/l (P = 0.03). CONCLUSIONS: In patients treated by haemodialysis without reverse osmosis high serum silicon concentrations were associated with lower serum aluminium concentrations than those with low serum silicon. Further work needs to confirm a preventative role for silicon in the accumulation and subsequent toxicity of aluminium in dialysis patients.     

碳,硅和铝对奥氏体不锈钢粉末烧结时表面反应的影响

研究了碳、硅和铝合金元素对水雾化奥氏体不锈钢粉末烧结时的表面反应的影响。经实验发现,表面反应产物的形态及分布取决于合金元素的还原行为,这直接影响烧结材料的力学性能。     

合金元素对无取向电工钢磁时效的影响

研究了碳、硅、铝合金元素的含量变化对无取向电工钢磁时效的影响。实验结果表明:碳含量是影响无取向电工钢磁时效的主要因素,硅、铝合金元素由于其影响碳元素的分布对电工钢磁时效也有重要影响;当w(C)小于0.003%时,无取向电工钢无明显的磁时效现象,当w(C)大于0.003%时,无取向电工钢容易产生磁时效现象,且磁时效随着w(Si+Al)的增加而降低,当w(Si+Al)大于2.5%时,无取向电工钢磁时效消失。     

硅铝铁合金生产简述及实际生产探究

产品的多元化是企业生存发展的需要,硅铝铁合金是炼钢过程中应用比较广泛的一种复合强脱氧剂,而粉煤灰用于提取硅铝铁合金是可行的,可以更好的改善环境,发展循环经济。     

An Approach for Simulation of Corex Process Smelter Gasifier for Prediction of Coal Rate and Silicon in Hot Metal

A thermodynamic model for the Corex process smelter gasifier focusing on coal pyrolysis as well as on the wustite reduction has been proposed. The compositions of hot metal, slag, and the export gas of the Corex process have been simulated satisfactorily for a given degree of metallization of directly reduced iron (DRI). The minimum coal rate is linked to the given degree of prereduction of DRI and the desired final silicon content in the hot metal.     

无缝管用低硅ST30A1钢LF精炼过程钢水硅含量控制

分析了低硅钢ST30Al（/%:0.06~0.10C,≤0.05Si,0.30~0.45Mn,≤0.015P,≤0.005S,0.025~0.050Al）在LF精炼过程中钢水回磷量、钢水铝含量、精炼渣二元碱度、精炼渣Al₂O₃含量等因素对钢水增硅量的影响,得出转炉下渣量、钢水铝含量、精炼炉渣碱度是影响增硅的主要因素。通过控制转炉下渣、降低原辅料中的硅含量、调整精炼渣中SiO₂、Al₂O₃含量、控制精炼渣二元碱度14,渣中Al₂O₃为27%,控制钢水铝含量0.010%~0.020%,LF钢水增硅量由原0.033%~0.047%降低到0.004%~0.018%,成品钢水硅含量≤0.035%。     

钼蓝光度法测定铝及铝合金中硅的含量

介绍了用钼蓝光度法测定铝及铝合金中硅含量的方法。铝合金样品用氢氧化钠分解,硝酸酸化。在弱酸性溶液中,加入钼酸铵,使硅酸根离子与钼酸根离子形成黄色络合物,在硫酸介质中用抗坏血酸还原成硅钼蓝,测定其吸光度。结果表明：该方法操作简单,测定铝及铝合金中硅的含量范围广（0.1%～12%）。方法的稳定性、重现性和准确性都良好,能满足铝及铝合金中硅含量的分析检测要求。     

化学成分体系对无取向硅钢夹杂物控制的影响

 结合工业化生产的无取向硅钢,采用非水溶液电解+扫描电镜观察方法,探讨了化学成分体系对夹杂物控制的影响。结果表明,随着Si、Al元素含量升高,氧化物夹杂数量明显减少。氮化物夹杂数量先是快速增多、而后逐渐减少。与此同时,夹杂物平均尺寸逐渐变大。低铝状态下,硫化物夹杂数量较多;高铝状态下,硫化物夹杂数量明显减少,而且CuxS夹杂消失。高硅低铝系列钢、中硅低铝系列钢、低硅无铝系列钢、高硅高铝系列钢夹杂物数量依次减少。     

含钨原料碱浸过程中添加氧化铝对浸出液质量的影响

针对国内钨冶炼厂用苛性钠浸出含钨原料时,添加氧化铝抑制杂质有不同效果的情况,研究不同温度下煅烧氢氧化铝所得到的产物作添加剂的效果。采用X光衍射、电子显微镜、热重分析、粒度分析等手段考察了不同氧化铝的结构与性质,并从这一角度讨论了氧化铝对砷与硅的抑制作用。     

Selective removal of dissolved silicon and aluminium ions from gas liquor by hydrometallurgical methods

Sasol raw gas liquor emanating from the gasification plant is contaminated by trace amounts of silicon, iron and aluminium which can crystallize or precipitate from gas liquor to form synthetic clay during either: (1) gas liquor transportation from the gasification plant to the phenosolvan plant or (2) during the liquid–liquid extraction process. Phenol is a major high value component of gas liquor which can be selectively recovered by diisopropyl ether (DIPE) from gas liquor during a liquid–liquid extraction process. A colloidal alumina/silica precipitate readily occurs on the heat exchanger plates during the liquid–liquid extraction process. This gelatinous precipitate formation is an operational problem which results in a severe blockage of the heat exchanger plates and eventually needs to be unblocked with hydrofluoric acid, a toxic and corrosive chemical. The precipitate formation can be attributed to the presence of the aluminium, silicon and iron species in the gas liquor.Characterisation studies identified metal ions such as Al³⁺, Ca²⁺, Fe³⁺, Mg²⁺, Si⁴⁺ and K⁺ in all liquid samples analysed in this study. Major anions detected in the liquid samples are sulphate, fluoride, chloride, bicarbonate, carbonate and nitrate. Thermodynamic modelling of inorganic compounds in the gas liquor sample indicates that Al(OH)₃, CaCO₃ and Fe(OH)₃ are dominant precipitates between pH 8 and 10 and a temperature of 40 °C.In this study, various purification processes such as: (1) desilication, (2) flocculation, and (3) selective precipitation were evaluated to selectively remove silicon, aluminium and iron species from the phenol-containing gas liquor. In addition a complexing of Al (III) and Fe (III) ions with citric acid was investigated to retain both aluminium and silicon species in the phenol-containing gas liquor during the extraction of phenol. The concentration of phenol present in the gas liquor must not be affected during the removal of aluminium, silicon and iron ions from the gas liquor. The preliminary results obtained indicate that in terms of removing the aluminium and silicon species from the gas liquor, the addition of seed crystals such as alumina, gibbsite and silica to gas liquor coupled with flocculation proved superior to all hydrometallurgical processes evaluated in this study. The availability of this technology to eliminate or substantially reduce silica and alumina fouling would reduce expensive maintenance and down time requirements and also enhance the plant efficiency.