共搜索到18012条信息,每页显示10条信息,共1802页。用时:0小时0分0秒328毫秒
usually covers the ore particles, thus preventing effective contacting of the ore particles with the leaching solution, and reducing the leaching rate of the metal being extracted[1-7]. To enhance... the rate of leaching solution diffusing to the surface of ore particles, but also the leaching reaction. Fig.2 Effect of leaching temperature on zinc extraction 3.2 Effect of mass ratio......
......
with the model: v=1.87t-0.54, indicating that the leaching rate of Cr(Ⅵ) declines in an exponential order of -0.54. Key words: chromium-containing slag; Cr(Ⅵ) leaching; leaching rate; dynamic model  ...? CaCrO4 have slow diffusion rate[13]. Previous research demonstrated that decreasing pH value and increasing pressure and temperature could promote Cr(Ⅵ) leaching[11]. Moreover, CaCrO4·Ca2SiO4·CaCrO4......
: The effect of mineral particle size, pulp potential and category of oxidant on pyrite leaching was studied. The results show that a smaller mineral particle size leads to a higher leaching rate of pyrite, and the optimum result with pyrite leaching rate of 2.92% is obtained when mineral particle size is less than 0.037 mm. The pulp potential reflects the leaching process. The increase of pulp......
Mechanism of electro-generating leaching of chalcopyrite-MnO2 in presence of Acidithiobacillus thiooxidans XIAO Li(肖 利)1, 2, LIU Jian-she(柳建设)3, FANG Zheng(方 正)1, QIU Guan-zhou(邱冠周)4 1. School... minerals in the electro-generating leaching(EGL) and the bio-electro-generating leaching(BEGL), respectively. The results showed that the dissolution rates for Cu2+ and Fe2+ in BEGL were almost 2 times......
exist salt in the experimental materials. The changing curve of leaching rate with time can be figured out, as shown in Fig. 3. According to Fig. 3, the leaching rate increases gradually with the reaction progress. Furthermore, it performs an evolution of initial fast-increasing, midterm slow-increasing and final stabilizing. Early in the leaching process, the leaching rate of low grade samples......
......
size and leaching time on dissolution rate of the main metals in the samples were investigated. The prepared leaching solution with the desired hydrochloric acid concentration was placed into a 1 L.... The reaction temperature was controlled by an isothermal water bath with a digital thermometer (within ±1 ℃). The reaction mixture was agitated at a fixed rate of 250 r/min. The effect of leaching time......
. Ferric ion plays an important role on limiting the electrogenerative leaching rate at a relatively low concentration of FeCl3 (about less than 0.15 mol/L). The mathematical models based on the Butler... respectively. As the concentration of ferric ion increase, the correlative dependence between electrogenerative leaching rate and concentration of ferric ion becomes weak. The above conclusions......
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......