In situ leaching of weathered crust elution-deposited rare earth ore usually uses ammonium sulfate as the agent, which poses challenges such low mass transfer efficiency, high consumption agent and long periods. order to intensify process elements reduce impurity accompanying earth, formate were mixed a novel compound treat ore. The effects concentration, liquid/solid ratio, pH temperature on (...

We investigated the preparation of CMB (cobalt-manganese-bromide) and CMA (cobaltmanganese-acetate) liquid catalysts as petroleum liquid catalysts by simultaneously recovering Co and Mn from spent Li-ion battery cathode material. To prepare the liquid catalysts, the total preparation process for the liquid catalysts consisted of physical pre-treatments, such as grinding and sieving, and chemica...

Usage of oil shale produces abundant oil shale residue, which may not only directly cause serious pollution to the environment, but also result in a waste of resource. In this paper, acid leaching method and alkali soluble method were compared to obtain the optimum processing conditions for the preparation of white carbon black, which was determined as follows: the mass fraction of NaOH was 8 %...

To prepare activated carbons with a high porosity and low ash content from pyrolyzed rice husk, the method of KOH or K2CO3 solution leaching after CO2 activation was investigated. The effects of KOH or K2CO3 concentration and leaching time on the yield, ash content, and textural properties of the activated carbon were studied, and the activated carbon prepared under the best conditions was char...

Chromium (VI) Considered as a serious health hazard and it has attracted attention as a pollutant in natural waters. The sources of contamination of chromium in natural waters and in the Environment are from electroplating, tanning industries and waste solution from oxidative dyeing and leaching from sanitary land – fills, In view of this the separation and determination of chromium has been re...

ABSTRAK
 Perkembangan industri elektronik di Indonesia meningkat, maka begitu juga dengan limbah yang dihasilkannya. Salah satu bentuk adalah lempengan PCB (Printed Circuit Board). Logam seperti Au, Ag, dan Cu dapat ditemukan pada PCB, logam-logam tersebut dilakukan pemisahan metode leaching. Penelitian ini bertujuan untuk mengetahui pengaruh volume larutan HNO3 sebagai tahapan pre-leachin...

The intensification of the gold thiourea leaching from a filtration waste (Košice, Slovakia) using mechanical activation as the pretreatment step has been studied. The leaching of “as-received“ sample in an acid thiourea solution resulted in 65 % Au dissolution. However, after mechanical activation in a planetary mill 99 % of the gold was leached. The optimum redox potential for electrolysis is...