共搜索到3988条信息,每页显示10条信息,共399页。用时:0小时0分0秒343毫秒
......
......
Effect of mechanical activation on alkali leaching of chromite ore ZHANG Yang(张 洋)1, 2, ZHENG Shi-li(郑诗礼)1, DU Hao(杜 浩)1, XU Hong-bin(徐红彬)1, ZHANG Yi(张 懿)1 1. National Engineering Laboratory.... It is observed that the extraction ratio reaches 97% after leaching for 200 min when chromite ore is mechanically activated for 10 min, but only 34% if not activated. Mechanical activation can decrease......
of alkali concentration on leaching efficiency of metals 图4表明,在考察的碱浓度范围内,Al的浸出率略有增加,然后维持不变;Zn的浸出率随着碱浓度升高而逐渐增加,但NaOH浓度较低,碱浓度在1.0~1.5 mol/L时,Zn的浸出率较低;Pb,Sn,Cu浸出率很低,基本不参与反应.当碱浓度为1.25 mol/L时,Al得到最大程度的浸出,浸出率为...度为0.4 mL/min,浸出温度为50 ℃,浸出时间为120 min条件下,考察初始NaOH溶液浓度对氧化浸出过程金属浸出率的影响,实验结果如图7所示. 图7 碱浓度对金属浸出率的影响 Fig. 7 Effect of alkali concentration on leaching efficiency of metals 图7表明,随着初始碱浓度升高,金属浸出率均呈......
inserts itself into the silicate lattice, producing intermediate Mg2SiO4 and Na2MgSiO4 products. After the alkali leaching process, Mg2+ can be separated from SiO4 array, which can be released out of the silicate in the form of Mg(OH)2. Key words: MgSiO3; Raman spectroscopy; alkali melting; leaching reaction mechanism 我国硅镁型红土镍矿的特点是品位低,多伴生矿,且矿中镁,硅含量(质量分数)高达30%以上,易形成镁硅酸盐(如MgSiO3和Mg2SiO4).矿中各种金属离子相互......
detection for the alkali leaching was made by using Raman spectroscopy; XRD was used to analyze the structure of water leaching residue, to explore the reaction mechanism of NaOH decomposing Zn2SiO4... leaching process, Zn2+ can be separated from the SiO4 array, which can be released out of the silicate in the form of ZnO.Key words:Raman spectroscopy; Zn2SiO4; alkali melting; reaction mechanism......
; 文献标志码:A 文章编号:1672-7207(2016)07-2196-09 Dissolving behavior of silica of ocean polymetallic nodules in low mass fraction of alkali leaching... the comprehensive utilization, an alkali leaching pretreatment of ocean polymetallic nodules was studied. The effects of initial mass fraction of NaOH, leaching temperature, mass ratio of liquid......
. WAN Wen-yu, CHEN Wei, HUANG Shun-hong, SUN Jian-de, LI Qian. Antimony oxidation removal from arsenic alkali residue leaching solution[J]. Nonferrous Metals (Extractive Metallurgy), 2015(8): 6-9. [2] 韦岩松, 杨宗朝. 从砷碱渣中浸出砷的试验研究[J]. 湿法冶金, 2014, 33(5): 371-374. WEI Yan-song, YANG Zong-chao. Leaching of arsenic from arsenic-alkali residue[J]. Hydrometallurgy, 2014, 33(5): 371-374. [3] 陈白珍, 王中溪, 周竹生, 胡干武, 仇勇......
cyanide leaching can reach Pt 96%, Pd 98% and Rh 92% respectively. Key words: platinum-group metals; spent auto-catalysts; pressure alkali treatment; pressure cyanide leaching 失效汽车废催化剂是当... by method of pressure alkaline treatment-cyanide leaching HUANG Kun, CHEN Jing, CHEN Yi-ran, ZHAO Jia-chun, LI Qi-wei, YANG Qiu-xue (Kunming Institute of Precious Metals, Kunming 650221, China......
J. Cent. South Univ. (2020) 27: 27-36 DOI: https://doi.org/10.1007/s11771-020-4275-4 Kinetics of leaching lithium from lepidolite using mixture of hydrofluoric and sulfuric acid WANG Hai-dong(王海东)1... shows great potential in leaching lithium (Li) from lepidolite. Leaching kinetics of Li in a mixture of sulfuric acid and hydrofluoric acid, which is a typical lixivant for the fluorine-based chemical......