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211 The ore heap leaching cycle period is an important parameter that affects the output and economic technological index.

212 The process of producing vanadium pentoxide from bone coal vanadium mine without salt-roasting and acid leaching, was systematically studied.

213 The Mo recovery process was tested from the smelting slag of Bi reverberatory furnace by water quench leaching, and the tested process was compared with the present soda leaching process.

214 The results show that the hydrochemical transference can be divided into leaching stage, adsorption stage and equilibration stage.

215 The results showed that from island silicate minerals to framework silicate, the leaching abilities of the tested strain on Al and Si in them showed regular change.

216 The roasting is atmospherically leached under diluted acid, and the leaching rate of vanadic anhydride in the invention can reach over 82%.

217 The behaviour of cathodic process of leaching gold with thiosulfate has been investigated in this paper.

218 The effect of preparation conditions of the captioned process on the leaching rete and properties of the product is discussed.

219 The nitrogen fertilizer losses in paddy field involve nitrification - denitrification, ammonia volatilization nitrate leaching and runoff.

220 The polysulfide solution is one of non cyanidation systems of gold leaching in which polysulfide ions are the main effective components.

221 It is effectively on accelerating leaching speed of copper sulfide and increasing leaching rate of copper that bacteria acts on low grade copper sulfide ore.

222 Alkaline leaching of Zn from zinc oxide ore from Lanping, Yunnan is investigated.

223 This paper covers production practice of jarosite process in hot-acid leaching and comparison between iron hydroxide process and jarosite process that are used for iron removal.

224 The salts ( of the soil ) have been leaching away during a drenching rain.

225 Arsenic is a metalloid element, contaminating the environment through leaching from mineral ores, copper smelting, and other industrial and agricultural sources.

226 Sulfuric acid leaching technology of a nickeliferous spent material was studied.

227 Selective leaching of nickel(sentencedict.com), cobalt and copper from cobalt crusts was attained by using ammonium carbonate solution and sulfur dioxide gas as a reductant.

228 This Paper discusses the method for uranium exploration based on the analysis of helium in water leaching soil samples using ion pump helium detector.

229 Compared with acid medium concentration and reaction time, temperature most notable factor to the leaching results.

230 From the relation between ore pile soakage rate and occurrence, on the basis of practice of stope leaching, the methods of lixiviant distribution for stope leaching are described in this paper.