Pre-concentration of vanadium-bearing mica from stone coal by roasting-flotation 403 Currently techniques used to extract vanadium from stone coal mainly include direct acid leaching roasting-acid leaching roasting-alkali leaching calcified roasting-carbonate leaching and low salt roasting-cyclic oxidation (He et al 2007 Wang et Palladium is also used in electronics dentistry medicine hydrogen purification chemical applications groundwater treatment and jewelry Palladium is a key component of fuel cells which react hydrogen with oxygen to produce electricity heat and water Ore deposits of palladium and other PGMs are rare

Leaching vanadium by high concentration sulfuric acid from

extracting vanadium from stone coal The aim of this work is to extract vanadium from stone coal using high concentration sulfuric acid The effect of the concentration of sulfuric acid leaching temperature leaching time and helper leaching agent on the extraction of vanadium was researched 2 Experimental 2 1 Materials

vanadium recovery was 90 9% KEYWORDS vanadium pentoxide purification extraction INTRODUCTION The classical technology for extracting vanadium from stone coal has two main problems low vanadium recovery (50%) and the production of environmen-tal pollutants1 2 and is therefore being eliminated gradually In recent years researchers have

The invention relates to a process for extracting vanadium from stone coal through two-section curing with concentrated acid The process flow mainly comprises the following steps of a) adding concentrated sulfuric acid into the vanadium-containing stone coal and uniformly stirring b) performing one-section curing on the mixture of the concentrated sulfuric acid and the vanadium

Abstract Based on the novel composite additive BaCO 3 /CaO for the vanadium extraction from the refractory stone coal the vanadium leaching effect has been investigated and many technical conditions have also been optimized The results indicated that an optimum vanadium leaching efficiency of 81 07% can be obtained under the conditions that the mass ratio of BaCO 3 to CaO was 1 9 with the

Jul 28 2010A new process of extracting vanadium from the stone coal vanadium ore in Fangshankou Dunhuang area of Gansu Province China was introduced Various leaching experiments were carried out and the results show that the vanadium ore in Fangshankou is difficult to process due to its high consumption of acid and the high leaching rate of impurities

process of extracting stone

CN101275187A Process for extracting vanadium by stone The invention discloses a process for using stonelike coal wet method to extract vanadium comprising the steps of crushing and ballmilling the stonelike coal to sieve mix (adding additive) pickle exchange the ions depositing the vanadium and calcine to produce the product of vanadic oxide the comprehensive recovery rate is larger

The invention discloses a process for using stone-like coal wet method to extract vanadium comprising the steps of crushing and ball-milling the stone-like coal to sieve mix (adding additive) pickle exchange the ions depositing the vanadium and calcine to produce the product of vanadic oxide the comprehensive recovery rate is larger than 80% compared with current process the leaching

The development of technology on vanadium extraction from stone coal by adding sodium chloride and calcium oxide was reviewed Stone coal with large amount of silica and low in calcium was suitable for roasting with sodium chloride Stone coal with large amount of calcium was suitable for roasting with calcium oxide Both techniques had advantages The optimum additive dosage roasting temperature

Vanadium as one of the important rare elements has been widely used in industrial production The raw material for industrial production of vanadium consists of vanadium-titanium magnetite oil ash waste vanadium catalyst bauxite and stone coal In addition 75% to 85% vanadium production was extracted from vanadium-titanium

Vanadium was leached from roasted stone coal by NaOH solution and the effect of leaching temperature leaching time addition of NaOH liquid to solid ratio the grinding fineness of stone coal and stirring speed on the vanadium leaching rate was studied The kinetics analysis for the process is presented by the shrinking core model

Title October output of companies extracting vanadium from stone coal Summary According to incomplete statistics there are 14 companies extracting vanadium from stone coal in production and two companies in suspension due to environmental inspections Category China Market Analysis Publish Date Mon 12 Nov 2018 07 11 00 GMT

Calcified roasting-acid leaching process of vanadium from low-grade vanadium-containing stone coal WANG Taiying 1 XU Longjun1* LIU Chenlun2 and ZHANG Zhaodi1 1 State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing University Chongqing 400044 China

In China not only the reserves of the vanadium coal stone ores with grade of less than 0 8% are over 60% but it is always found in the high-grade mines also often extrain some low-grade ore beds or ore belts For this reason an experimental research on extracting vanadium by acid leaching method was carried out A stone coal from Guizhou province with grade of 0 60% vanadium was selected as raw

Analysis on the Output from Stone Coal in

According to incomplete statistics only 13 enterprises who can extract vanadium from stone coal are under normal production and another 13 enterprises are shutdown for maintenance in September Environmental reasons continue to reduce the output of enterprises who can extract vanadium from stone coal

The technology of extracting vanadium from stone coal in China History current status and future prospects Hydrometallurgy 2011 109 116–124 [CrossRef] Lin H Fan B Study on mechanism of phase transformation during roasting and extracting vanadium from Fangshankou stone coal Chin J Rare Met 2001 25 273–277

Experiments comparing microwave blank roasting and conventional blank roasting for typical vanadium-bearing stone coal from Hubei Province in central China in which vanadium is present in muscovite were conducted to investigate the effects of roasting temperature roasting time H 2 SO 4 concentration and leaching time on vanadium extraction

Experiments comparing microwave blank roasting and conventional blank roasting for typical vanadium-bearing stone coal from Hubei Province in central China in which vanadium is present in muscovite were conducted to investigate the effects of roasting temperature roasting time H 2 SO 4 concentration and leaching time on vanadium extraction

The separation of vanadium from the other cationic components was achieved by pH controlling techniques with several steps after extracting the soluble cations from the slag by acid treatment at 95 C The vanadium was collected at the final process as sodium vanadates with an approximate composition of Na1 2V3O8