·An improved method of NH4 2SO4 roasting followed by water leaching to utilize zinc oxidized ores was studied The operating parameters were obtained by investigating the effects of the molar ratio of NH4 2SO4 to zinc roasting temperature and holding time on zinc extraction The roasting process followed the chemical reaction control mechanism with the
·Utilization of plentiful fine disseminated iron oxide ores resources attracted increasing attention in these years due to the depletion of easy dressing iron ore reserves In this paper an improved Fe recovery method from the refractory fine grained iron ores was proposed and iron can be stepwise recovered by microwave assisted reduction roasting with the addition
·The optimum conditions for quantitative recovery of Mn was determined as M H 2 SO 4 40% of ore wt waste tea for Gabonese ore and M H 2 SO 4 10% of ore wt waste tea for Xiangxi ore keeping the constant liquid to solid ratio of 1 95 °C leaching temperature for 8 h for both the ores Leaching kinetics studies for both the
·Semantic Scholar extracted view of "Production of a ferric chloride coagulant by leaching an iron ore tailing" by V Almeida et al reaction temperature solution concentration and particle size in leaching process were investigated by univariate method A case study on hematite tailings from Ansteel China Cong Li Xiaofeng Yang 5
·The processing of iron ore generates large volumes of tailings Acid leaching enables the solubilization of iron in an aqueous solution allowing the production of ferric liquor and a silica rich
·Geology deposit types and ore minerals There are more than 200 minerals that contain REE 7 8 The most common rare earth minerals are monazite and bastnäsite Figure 1a b and Table II Monazite exists as a group of arsenates phosphates and silicates but the primary REE bearing monazite is a complex phosphate 5 Bastnäsite also known as
·Hypochlorite leaching system is a strong oxidizing solution for metal sulfides which are naturally associated with gold extraction This study evaluated the hypochlorite leaching of refractory gold ore by using the response surface method central composite design RSM CCD as a statistical approach in determining the optimum condition of gold extraction from
·An integrated hydrometallurgical process was used for the zinc leaching and purification from a zinc ore containing wt% zinc The zinc minerals in the ore were hemimorphite willemite and
·In this paper the direct reduction melting separation leaching process is investigated on recovering rare earth from rare earth Bayan Obo complex iron ore REBOCIO The Bayan Obo Mine in the Inner Mongolia region of North China is the largest iron LREE niobium ore deposit of hydrothermal origin known in the world
It was found in this research that addition of sulfuric acid up to ml/g with moisture 40 wt pct followed by roasting process at 700 °C for 30 minutes and leaching process at 80 °C for 30
·A leaching process by using oxalic acid to remove low iron content from the ore under study and to obtain a material suitable for fiber optic production has been evaluated
·The leaching of rare earth elements REEs including cerium lanthanum and neodymium from apatite concentrate obtained from iron ore wastes by nitric acid was studied
Microbial ore leaching bioleaching is the process of extracting metals from ores with the use of microorganisms This method is used to recover many different precious metals like copper lead zinc gold silver and nickel Bacteria recycle the major leaching reagent like ferric iron and perform further oxidation steps while gaining
·Manganese Mn extraction from iron rich pyrolusite ore with cheap sulphur dioxide is considered to be the most promising method with advantages of rapid leaching rate and high leaching efficiency
·However after approximately 7 days of incubation ferrous iron Fe²⁺ concentrations were gradually increased in leaching assays with NaCl indicating that iron oxidation activity over time
·Iron tailings usually contain As Cd Co Cr Cu Fe Mn Ni Pb and Zn some of which are highly toxic and carcinogenic Leaching is the process of extracting soluble substances from solids using leaching agents water acid alkali and salt solutions and it is a crucial hydrometallurgical method for metals extraction from various solids Ye et al 2017; Zhang et
·The magnesium sulfate MgSO 4 ascorbic acid Vc compound leaching technique can extract rare earth elements REEs existing in ion exchangeable phase and colloidal phase from ion adsorption type rare earth ore through the synergy effect of coordination and reduction but its reaction process and mechanism remain this paper the
This paper reports the phosphorus removal of high phosphorus oolitic iron ore by acid leaching and its influence factors The experimental ore is Exi high phosphorus oolitic iron ore with % phosphorus % iron and % sulphur After acid leaching the P content decreases to about % the iron loss during acid leaching is about % and the S content is % which
·As a hazardous solid waste vanadium bearing converter slag vanadium slag is used hereafter is the main raw material for the recovery of vanadium in China that accounts for approximately 85% of the vanadium production [1 2] Depending on the type of titaniferous magnetite ore the vanadium slag may contain 5% 20% V 2 O 3 and varying amounts of
China is seriously insufficient in manganese and iron ore resources respectively accounting for % and 9% of the world s reserves and the ore s grade is poor with average 22%
·Reduction roasting acid leaching process was utilized to process high iron content manganese oxide ore using black charcoal as reductant The results indicate that compared with the traditional reductant of anthracite higher manganese extraction efficiency is achieved at lower roasting temperature and shorter residence time The effects of roasting
·A major source of vanadium recovery and also the raw material of this research is the vanadium bearing V bearing shale The main purpose of the study is to capture the difference between the ultrasonic assisted and regular leaching of vanadium from roasted V bearing shale having a V 2 O 5 grade of % In this work the effects of various factors such
·Iron ore having high sulfur content causes problems in the concentrate production pelletizing and steel making processes and environmental issues such as sulfur dioxide emission during the
·Mine tailings deposits are often overlooked by the industry posing significant environmental challenges due to chemical hazards and inadequate maintenance Nevertheless such mineral deposits hold considerable economic potential for processing and the adoption of innovative technologies may also address critical chemical and physical stability issues
