it was suggested that the nitrate vertical leaching had a greater pollution potential to water body than the lateral leaching during the wheat growth period in the fields. Key Words:Wheat field, nitrate, vertical leaching, lateral leaching, horizontal movement potential, China.
Table 3 shows the nitrate losses to be expected due to undesirable side reactions that occur when leaching the pilot plant concentrate at 110° C with 700 pounds of HNO3 per ton of ore. These results indicate that reduction of nitrate to nitrogen and nitrous oxide is highly detrimental.
and Recovery of Ruthenium Content from Leached Residues Jae Woo Ahn 1, Dong Wha Chung, Ki Woong Lee2, ... Keywords: ruthenium, nitric acid leaching, lead nitrate, solubility, scrap 1. Introduction Increasing demand for electronic products has generated ... value with increase in nitric acid concentration up to 11.0M.
Nitrate leaching at a depth of 60 and 120 cm was calculated using the daily water drainage values obtained by Cannavo et al. during the study on the same plot. Water flow in the soil was simulated using the HYDRUS 1D model (Simunek et al. 2005 ).
Heap leaching is a tried and tested mining technique enabling the processing of different kinds of ores which could not otherwise be exploited under viable economic conditions. Modern day
In agriculture, leaching is the loss of water-soluble plant nutrients from the soil, due to rain and irrigation. Soil structure, crop planting, type and application rates of fertilizers, and other factors are taken into account to avoid excessive nutrient loss.
Risk of High Nitrogen Leaching in East and South Central Nebraska July 28, 2015. Nitrogen will leach when soil water content becomes greater than the maximum soil water holding capacity, as excess water will drain below the root zone carrying within it soluble nitrogen, mostly as nitrate.
Apparent N recovery by turf ranged from 28 to 40% of applied N, with a maximum corresponding to 4.7 micro g cm-2 d-1 AEM soil NO3-N. Turf colour, growth, and chlorophyll index increased with increasing AEM soil NO3-N, but these increases occurred at the expense of increases in NO3-N leaching losses.
RECOVERY OF METAL VALUES FROM METAL-FINISHING HYDROXIDE SLUDGES BY PHOSPHATE PRECIPITATION ... recovery. The leaching operation produces a feed stream with a pH value of approximately 1.5. ... or nitrate systems, and the solu- bility is not significantly affected by
Lead Nitrate addition in CIL operations and how the dosage of Pb Lead nitrate affects gold leaching kinetic rates. The main aim for adding lead nitrate is to help in Gold dissolution in CIL plants. Should the gold solid tails be the main aim for dosing lead nitrate in the treatment of slightly compl
lysimeter-based N leaching values were lower than the values from the drainage lysimeter and soil coring methods. However, overall nitrate ... The experiment compared the nitrate leaching for different irrigation rates and three methods of measuring nitrate leach-ing. The experimental design consisted of factorial irrigation
Mulching and nitrogen are critical drivers of crop production for smallholders of the Loess Plateau in China. The purpose of this study was to investigate the effect of mulching and nitrogen fertilizer on the soil water content, soil nitrate-N content and vertical distribution in maize root-zone.
United States Patent NITRIC ACID LEACHING PROCESS Felix A. Schaufeiberger, Basel, Switzerland, assignor to American Cyanarnid Company, New York, N.Y., a corporation of Maine No Drawing. ... It is a further object to recover values in metals other than iron, which may dissolve concomitantly therewith during leaching. ... Nitrate leaching ...
The effect of the particle radius is easily observed in the Nitrate recovery, where the leaching occurs exclusively on the particle surface. However, as mentioned before, for the leaching of Magnesium, the effect is more difficult to observe, since it depends on a double kinetic (particles and collapsed material).
nitrate, and nitrate leaching  . A nitrate in groundwater and drinking water supplies is mainly a great concern for infants less than six months old, pregnant and nursing women  .
Read 2 answers by scientists with 6 recommendations from their colleagues to the question asked by Sidharth sankar Parhi on Apr 18, 2014
Temporal trends in nitrogen isotope values of nitrate leaching from an agricultural soil. Nathaniel E. Ostrom, ... 1993 to assess the origins and transformations of NO 3-leaching from an agricultural soil. ... These δ 15 N values would normally be indicative of NO 3-derived from fertilizers, ...
Sensible value. Mutual mixing range of water - organic liquid systems is very broad. In one specific case, one solvent can ... Solution and Producing of Leaching Agents Mostafa Shamsi, and Ehsan Farahbakhsh ... Fig. 3 Recovery process of nitrate from effluent .
Apparent fertilizer nitrogen recovery and residual soil nitrate under continuous potato cropping: Effect of N fertilization rate and timing ... with average values of 1.06m and 1.34m in the shallow MZ (SMZ) and in the deep MZ (DMZ), ... leaching (Munoz et al. 2005; Davenport et al. 2005) andemissionsofnitrousoxide(N
This value has been found to be directly related to the rate of addition of the lead compound in the pre-leaching or leaching step. Further, the rate of addition of lead compound is also directly related to both the time required for, and the efficiency of, the cyanidation step.
value of the vegetable crops has encouraged wetland vege- ... . However, vegetable cropping systems that include tomato and leaf rape have a low N recovery compared with cereal crops (70 % N recovery) and consequently, about 50 % of N applied as mineral fertilizer or N mineralized from added ... drivers of nitrate leaching from cropping ...
The original objectives of the present program were to (1) demonstrate that rapid and complete leaching of copper and nickel values could be accom- plished from a typical metal-finishing sludge, (2) establish procedures and demonstrate the direct recovery of metallic copper and nickel values from the pregnant leach liquor by electrolysis, (3 ...
cyanide leaching by addition of 300 g/Mg lead nitrate to the leach slurry. Furthermore, numerous studies have shown that lead nitrate addition reduces the detrimental effect of metallic sulfides, increases gold leaching recovery and/or inhibits
Valencia et al. (2008) studied the leaching of caliche in columns and determined the recovery of nitrate and magnesium at different layer heights of the mineral. They analyzed the effect of time and the irrigation ratio and obtained empirical kinetic expressions.
The leaching of the rare earth values from the sludges by dilute nitric acid is considerably enhanced by the addition of calcium nitrate to the lixiviant, enabling recoveries of up to 85% to be ...
Nitrate can also be lost through leaching through the soil and into the shallow groundwater. North Carolina State University soil scientists have documented that some fertilizer or soil nitrogen can be lost from the root zone to the atmosphere through a process called denitrification .
Nitrate leaching from rice systems was evaluated from soil cores (0–2 m), from the fate of 15 N fertilizer in replicated microplots, and from about 145 regional groundwater wells.
Controlling nitrate leaching can be a ... cover crops to recover residual soil nitrate can be effective in ... leach any nitrate present in the soil. Nitrogen Management Practices Appropriate nutrient management can greatly reduce the risk of nitrate leaching loss. This includes consideration of: