共查询到20条相似文献,搜索用时 122 毫秒
1.
2.
3.
4.
5.
镍工业冶金渣的资源化 总被引:10,自引:0,他引:10
镍渣是FeO—SiO2系熔渣,与属于CaO—Al2O3-SiO2系的高炉矿渣在性能上有所不同。介绍了镍渣的产生、理化性能和应用情况,尤其对镍渣在水泥生产、混凝土的制备、砌块的制备以及矿井充填中的应用作了详细的介绍,并指出了镍渣在墙体材料、新型建材和农业等方面的进一步资源化方向。 相似文献
6.
红土镍矿火法冶炼镍铁合金过程中,会排出大量镍铁炉渣,当前,主要采用堆存、填埋等方式处理镍铁炉渣,不仅占用大量土地资源,而且污染环境。为此,以红土镍矿冶炼过程产生的高温熔融炉渣制备镍铁矿渣纤维。结果表明,在石灰添加量为16%、炉渣流量为4 200 kg/h、制纤温度为1 540℃、负压机风压为0.8 MPa、离心成纤机转速为4 000 r/min时,制得的纤维吸油率为5.2%、吸持沥青能力为自身质量的10.94倍,可以满足路用纤维材料的技术要求。镍铁矿渣纤维呈圆柱状,且表面缺陷较多。对镍铁矿渣纤维性能分析表明,镍铁矿渣纤维属于玻璃态非晶体物质,其表面对空气中二氧化碳分子和水分子的优先吸附和表面缺陷使其具有较好的沥青吸持能力。研究结果为镍铁矿渣资源化再利用提供了一种途径。 相似文献
7.
采用熔融法和直接玻化工艺分别对重矿渣进行了玻化处理,确定了适合的玻化工艺参数,并对玻化材料性能进行了检测,结果表明:重矿渣可玻化成高级饰面材料,其液态熔渣也可直接进行玻化,且重矿渣用量可达70%~80%,辅助原料少,工艺稳定,玻化材料的装饰性能好;且高温熔渣直接玻化的节能效果显著。 相似文献
8.
9.
为实现硅钙渣、粉煤灰及矿渣三种固废的协同利用,本文通过开展不同粉煤灰、矿渣比(灰渣比)下的硅钙渣复合地聚物制备实验,对硅钙渣复合地聚物的水化机理进行了研究。结果表明,硅钙渣复合地聚物是由β-硅酸二钙自身水化和碱激发水化共同形成的一种以C—S—H和C(N)—A—S—H为主的二元复合胶凝材料;相较于晶相矿物,玻璃相矿物更易发生碱激发水化反应,导致灰渣比在0.5以上时7 d水化物中残存大量未反应的莫来石,但随养护时间的延长莫来石会继续进行水化,并在28 d时生成蠕虫状四方钠沸石和条状贝德石。同时在灰渣比为1.0时,硅钙渣地聚物微观形貌最均匀致密,28 d抗压强度最高,达到37.9 MPa,说明此时能够发挥出粉煤灰、矿渣、硅钙渣之间最佳的协同效应。 相似文献
10.
分别采用原状钛石膏渣和其与42.5号普硅水泥复合作为矿渣的单一激发剂和复合激发剂,制备出系列过硫钛石膏矿渣水泥,并对其性能进行了系统表征。结果表明:(1)原状钛石膏渣单独激发矿渣所制备水泥的早期抗压强度较低,28 d抗压强度随着钛石膏渣量的增加而降低,钛石膏渣量高于35%后,试样软化系数趋于降低;(2)原状钛石膏渣和42.5号普硅水泥复合作为矿渣的激发剂,所制备水泥的早期抗压强度(3 d)显著提高,其中加入5%42.5号普硅水泥量试样的28 d抗压强度最高,之后抗压强度随其增加而降低,42.5号普硅水泥量超过10%后试样的抗压强度降幅趋缓;(3)原状钛石膏渣和42.5号普硅水泥复合激发矿渣水泥的水化硬化产物,主要由CSH(水化硅酸钙)凝胶、钙矾石及过剩的钛石膏共同构成。 相似文献
13.
14.
15.
16.
Accelerated carbonation of alkaline wastes such as steelmaking slag offers the potential to combine waste valorisation with climate change mitigation by utilising carbon dioxide (CO2). One method of achieving this is through an indirect carbonation process to produce a marketable precipitated calcium carbonate (PCC), using ammonium salts to selectively extract calcium from steelmaking slag. Two unaddressed design parameters for a slag based plant differing from that of a traditional PCC plant are the effect of mineralogy on extraction efficiency when using a multicomponent, heterogeneous feed such as slag and the challenges raised by the resulting leachate chemistry. This paper presents petrographic textural observations on the effect of calcium leaching via ammonium chloride on individual grains of dicalcium silicate in three different widely unutilised steelmaking slags. These observations are then interpreted in conjunction with measured changes in solution leachate chemistry. The results indicate that although silica enriched regions form at the reaction front, the reaction continues into the core of the particle due to fracture propagation caused by volume reduction as calcium is extracted. Co-leaching of sulfur alongside calcium and the formation of precipitate in the leachate highlights potential engineering challenges when the process is scaled up due to fouling of process equipment. The main mineral phases in all untreated slags were found to be calcium silicates, predominantly dicalcium silicate (Ca2SiO4). This was followed by a complex mixture of calcium/magnesium-wustite (CaFeMnMg)O type phases and srebrodolskite (Ca2Fe2O5(Ti, V)). Results indicate that calcium silicate is the more reactive component of BOS slag, while lime bound as (CaFeMnMg)O is most reactive in HMD and SS slags. Selectivity of the ammonium chloride solvent was high at 95–97% and efficiency of calcium extraction ranged between 25% and 39%. 相似文献
17.
金川镍渣的工艺矿物性质分析 总被引:1,自引:0,他引:1
采用化学分析、X射线衍射仪、光学显微镜、扫描电镜和能谱仪等方法,研究了金川镍渣的粒度组成、可磨性、化学组成、矿物组成、结构、主要有价成分Ni、Cu、Fe的元素分布等工艺矿物学性质。结果表明,该镍渣粒度主要集中在1~5 mm,渣的相对可磨度系数K镍渣=0.31,相对标样黄铁矿比较难磨。镍渣主要由铁氧化物、硅氧化物、镁和钙的氧化物组成,其它成分含量较少,属于碱性渣。与一般镍渣相比,渣中Fe含量较低,Mg含量较高,有价金属Ni的损失偏高。镍渣中主要矿相成分是铁镁橄榄石和非晶质玻璃质,并含少量的铜镍铁硫化物、辉铜矿、磁铁矿等。铁镁橄榄石主要呈柱状晶体沿一定方向排列,部分橄榄石形状不规则,非晶质玻璃质则充填在橄榄石间。该渣主要为固溶体分离结构,微细粒的金属硫化物无规律地分布于硅酸盐基质中,有用矿物的单体解离比较困难。Fe主要存在于铁镁橄榄石中,Ni和Cu主要分布于铜镍铁硫化物中。 相似文献
18.
19.
The pyrometallurgical production of copper generates slags, a residue with a significant content of this metal. Copper can be recovered from the slags by froth flotation after cooling, crushing, and grinding. The obtained Cu-concentrate is sent to the pyrometallurgical process. If grinding is not fine enough for efficient flotation, copper is lost in tailings. In this paper, the ferric leaching of slag flotation tailings is studied. Copper extractions of 66% are achieved by ferric leaching, and Cu content in tailings is reduced from 0.78% to 0.24%. 相似文献