This paper report on an acid leaching method to eliminate lithium from aluminium electrolyte system (CR=3). Both deionized water and HNO 3 were used. Also, the effects of the influences of acid concentration, leaching time, liquid-to-solid (L/S) ratio and temperature on the leaching efficiency were investigated.

The alkaline leaching method has the disadvantages of a larger consumption of reagents and lower economic benefits. The extraction rate of lithium in the sulfuric acid method is relatively poor, and the addition of a large amount of fluorine increases the difficulty of subsequent processing. The higher extraction rate of lithium …

2.5. Leaching kinetics. Kinetics of the acetic acid leaching was studied in select conditions employing 2 series of triplicate sample solutions. 2 g of the magnet powder was leached in a covered 400 ml beaker using 200 ml of 0.4 mol L −1 acetic acid solution at a temperature of 20 °C on a magnetic stirrer set to 600 min −1.Periodical subsamples (V …

In our previous work, we focused on the direct treatment of SCC based on the hydrothermal acid-leaching method and found that the carbon content of the treated SCC could be increased to about 98 % by a simple one-step acid leaching [20]. However, the existing process is difficult to realize the separation and recovery of all elements in the ...

Acid leaching is the most common method to extract valuable heavy metals for resource recycling and environmental protection. However, the coexisting elements, …

For this kind of silicon kerf, acid leaching has proven to be an effective method to eliminate metallic impurities in silicon kerf (Kong et al., 2019a; Yang et al., 2019, Yang et al., 2019). However, a significant mass loss occurs during acid leaching process as a result of the extreme small particle size of silicon kerf ( Martins and Margarido ...

The results of leaching with an eco-friendly organic acid are also presented, along with comparative leaching experiments with other positive electrode materials. …

The two widely used methods for zinc recovery are pyrometallurgy and hydrometallurgy but hydrometallurgy is preferred. 11,12 In the first stage of hydrometallurgy, which is leaching, inorganic acids such as sulfuric acid, 10,13,14,15,16,17,18 hydrochloric acid 13,16 and nitric acid 19 were extensively used as a lixiviant in the literature.

Such leaching methods could recover over 90% of vanadium from the petcoke ash, but it is limited to certain compositions. 4FeV 2 O 4 + O 2 (g) = 2Fe 2 O 3 + 4V 2 O 3 (ΔG 850 °C = −181 kJ) (7) ... Acid leaching is the process of recovering elements from a feedstock by solubilizing them in an acid. The desired elements could be …

Following rapid thermal processing (RTP), silica is subjected to an acid leaching using an acid mixture solution (AS2) composed of HF (5%):HCl (4%) with a volume fraction of 1:7. During this acid leaching, which was carried out under power ultrasound, an excess of the obtained silica was abundantly dissolved in 10 ml of (AS2) …

Abstract. Aluminum was leached out from coal fly ash by pressure acid-leaching method. The effects of coal fly ash size, sulfuric acid concentration, reaction time and reaction temperature on extraction efficiency of aluminum were investigated comprehensively. The phase and morphology of coal fly ash and solid residues after …

This paper used an acid leaching method as LiF reacts easier with acid than Li2NaAlF6. A one- step acid leaching method to remove LiF from an electrolyte with CR of 3.0 was used. The effects of the acid concentration, leaching time, liquid-to-solid (L/S) ratio and temperature on the leaching efficiency were investigated. Experimental

For this reason, a clean method to extract vanadium from the Fe 3− x V x O 4 minerals by single step leaching was proposed in our previous study (Yan et al., 2018, Chen et al., 2020a).In this method, vanadium could be directly leached by oxalic acid synergized with Fe powder under hydrothermal conditions.

A comparison between leaching efficiencies of sulfuric acid, nitric acid and hydrochloric acid revealed that H 2 SO 4 had better leaching effect than HNO 3 (Sakultung et al., 2007). HCl can also be used to recover ( Guo et al., 2016 ) lithium and cobalt from spent batteries but the reactions generate toxic gases like Cl 2 which pollute the ...

Several methods have been used to remove impurities in clay minerals, including acid leaching (Tripathy et al., 2019), alkaline leaching (Li et al., 2019), high pressure (Wu et al., 2012), and ...

Acid leaching is the most common method to extract valuable heavy metals for resource recycling and environmental protection. However, the coexisting elements, which are released from electroplating sludge to the leaching solution, will hinder the recycling of valuable heavy metals. In this work, dynamic acid-leaching experiments, X …

Heap Leaching of Uranium. Heap leaching is an extraction process by which chemicals (usually sulfuric acid) are used to extract the economic element from ore which has been mined and placed in piles on the surface. Heap leaching is generally economically …

This paper presents comparative experimental results for the single-stage and two-stage counter-current acid leaching of battery masses, with the addition of a booster, from different types of LIB waste. Three different types of battery masses were used in this research: Material I, module car; Material II, tablets and laptops; and Material …

When the acid concentrations exceed 20 wt% or the reaction time closes to 240 min, the leaching rates reach to a saturation value. This is because, with the increasing of reaction temperature, the thermal motion rate of molecules in the solution increases and the increasing HCl concentration is expected to provide more H + in the solution thus ...

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WEBJump To. The leaching process of copper, lead, and silver was successfully implemented by its design based on a thermodynamic study that deduced its optimal …

The alkali-melting acid leaching purification method is used to further purify the PG1 to obtain the PG3 with the fixed carbon content of 99.93%. The fixed carbon content is increased by 93.7% through flotation combined with alkali solution and acid leaching. The purification process of GO is systematically evaluated and analyzed by …

A novel method that employs org. acid recovery using citric acid and salicylic acid was used to enhance the leaching of metal ions from the cathode …

Acid leaching gives higher uranium recovery – 70-90% – compared with 60-70% for alkaline leach, and operating costs are about half those of alkaline leach. Techniques for ISL have evolved to the point where it is a controllable, safe, and environmentally benign method of mining which operates under strict operational and regulatory controls.

Dealkalization is the necessary step for the multipurpose use of red mud (RM), and acid leaching is a productive method to realize the dealkalization of RM. Most researches focus on recovering metals from the highly alkaline waste by pure acid leaching or stabilization by dealkalization. In this study, according to the strong alkalinity of RM …

samples, there is a need for improvement in the pretreatment technique for complete dissolution of the sample. Conventional alkali fusion method has yielded recovery of plutonium in the range of 12–60% with a mean of 36%. Newly adopted acid leaching followed by hydrogen fluoride treatment method achieved recovery in the range of 43 to …

Another method for hydrometallurgical extraction is acid digestion–leaching. Acid digestion is a process in which an ore/concentrate is mixed with a concentrated acid solution and heated to temperatures below the boiling point of the solution [].Through the acid digestion process, the mineral network is destroyed, and its …

Due to the suitable leaching efficiency of scandium, it is believed that direct acid leaching with dilute nitric acid is acceptable for RM with a low iron oxide content (less than 30 wt%) . Recently Boyarintsev et al. [ 142 ] evaluated the leaching of scandium from the Russian RM using 2.0 mol/L Na 2 CO 3 under carbonation conditions (CO 2 gas ...

To ensure a stable leaching process, the soaking leaching method was used in this experiment to promote the leaching reaction to reach thermodynamic equilibrium within a certain period. Therefore, the leaching capacity of the citric acid leaching system could be determined from the perspective of thermodynamic …

In this study, a novel lithium extraction method was proposed for α-spodumene by combining activated roasting and sulfuric acid leaching. First, the thermodynamics of the roasting process demonstrated that α -spodumene was converted into β -spodumene, which reacted with CaO to produce acid-soluble LiAlSiO 4 and …

Other articles where acid leaching is discussed: uranium processing: Leaching: Acid leaching is commonly performed by agitating an ore-leach mixture for 4 to as long as 48 hours at ambient temperature. Except in special circumstances, sulfuric acid is the leachant used; it is supplied in amounts sufficient to obtain a final leach liquor at about…