The characteristics of crude oils from the IPA extraction were:color Y70、R4.0,acid value 3.3 mgKOH/g,saponification value 192.3 mgKOH/g,and iodine value 130.7 gI/100 g.
It is indicated by the results that the extraction rate of nickel,copper and cobalt are up to 98%,98% and 90%,and the concentrations of valuable metals are up to 10～12g/L for Cu,13～15g/L for Ni and 2～3g/L for Co,respectively,under the condition of 50% solids concentration in charge and 25～30g/L total ions concentration in ammonia leaching solution.
The results showed that when the dreg of Eucommia seeds was extracted for 3×30min by 60% ethanol with a ratio of 1∶6(dreg∶solvent) at 80℃,the extraction rate of aucubin was 93 62%( n=3 ).
In deionized water, the leach rates of Cs+, Sr2+ in 42nd day were only 2.5 × 10-5 and 1.3 × 10-6 cm -d-1 (GB7023-86, 25℃ ), 0.7% and 0.2% cumulative leach percentage in altering.
Silver can be recovered from acid leach residue (300g Ag/t) by the process of superacid leach-sulfuration flotation at a recovery of 76.54% with the concentrate of grade of 4456.0g/t.
The commercial test shows that this process can achieve a zinc leaching rate of 98.05% and an iron leaching rate of 29.22%, thus realizing selective leach of the zinc effectively.
The results show that the leaching rates of manganese, copper, cobalt, nickel and iron are 98.20%, 99.88%, 99.91%, 99.95% and 18.23% respectively under the condition that the ratio of manganese nodule to reductant is 4∶1, the size of reductant -0.125 mm, the pH value of leach liquor about 2.2, and the leaching time 35 min.
In the leaching of low grade rhodochrosite ore,at pH of 1.7,temperature of 60 ℃,Fe~(2+) concentration of 20 g/L and pulp density of 10%,the leaching rate could reach 85% after stirring for 3.5 h.
They are functionally interconnected processes in the soil nitrogen cycle that are involved in the control of long-term nitrogen losses in ecosystems through nitrate leaching and gaseous N losses.
In the circulating fluidized-bed combustion of coal, the content of selenium in ash from the chimney was reduced to one-fourth of its original value and that in leaching water from the chimney decreased by two orders of magnitude using lime.
The Mn/Ce serial catalysts were characterized by Brunauer-Emmett-Teller (BET) analysis and the metal cation leaching was measured by inductively coupled plasma torch-atomic emission spectrometry (ICP-AES).
A two-step continuous flow leaching system consisting of an acidifying reactor and a leaching reactor was introduced to achieve the bioleaching of spent nickel-cadmium (Ni-Cd) batteries.
The water-soluble glucan was obtained from Pleurotus florida fruit bodies by hot water extraction, ethanol precipitation, DEAE cellulose dialysis and Sephadex G-75 gel filtration.
After all, NO3--N expected to leach from Podosol soil ranged from 0.6 (heating-dried sludge) to 3.9 times (limed sludge) relative to Ferrosol soil at similar biosolid application rates.
Leaching of reduced ores (manganocalcite and manganiferous limestone) was mediated mainly by degradation of manganiferous minerals (by sulfuric acid produced in the course of bacterial oxidation of pyrite or sulfur).
Inoculation of bacteria into pulp with pyrite increased the rate of leaching of oxide ore (psilomelane) by 37%, and the degree of its extraction within 180 h increased from 80 to 97%.
The possibility of the leaching of the studied metals from the contaminated soil by Basillus cereusVKM 4368 metal-resistant culture was demonstrated using glucose and sodium acetate as the sources of carbon and energy.
The properties of porous glass membranes prepared by acid leaching of sodium borosilicate glasses 8B and 8V and also 8B glass containing small amounts of fluorine and phosphorus (SFP) are comprehensively studied.
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