Flotation Separation of Soluble and Colloidal Indium from Aqueous Solution

Abstract

This work investigated the speciation and solubility of indium (In) and its flotation separation from aqueous solution. Lowest theoretical In solubility was predicted for pH 5.5−8.5, and the solubility increased as it became more acidic or more alkaline. Experimentally, 20 mg/L of In completely dissolved at pH < 3.0, which agreed with theoretical prediction. At pH 3.6−9.9, In showed slightly higher solubility than predictions. There was good agreement at pH > 9.9. Flotation reaction was described by pseudo-first-order kinetic model and its reaction rate increased with increasing nitrogen flow rate. The results indicated that pH played a key for the flotation process. As pH increased from 4.0 to 6.8, removal efficiency rose from 65.0% to 95.8% when applying surfactant SDS as collector. The efficiency decreased to 56.7% at pH 9.9. Lower removal efficiency was found once using CTAB. Electrostatic interaction between collector with both soluble and colloidal In was the main mechanism for In flotation.

In Situ Cross-Linked Polymerization toward Poly(ether sulfone)/Poly(sodium acrylate) Hybrid Particles for the Removal of Environmental Toxins

“…The pseudo-first-order equation, also known as the Lagergren rate equation, was the first rate equation for the adsorption of liquid–solid system based on solid capacity . It can be represented in the following form: ln ( q e − q t ) = ln nobreak0em.25em⁡ q normale − k 1 t where k 1 is the rate constant of pseudo-first-order adsorption; q e (mg/g) and q t (mg/g) are the adsorption amount of Cu 2+ at equilibrium and at time t (min), respectively.…”

Novel 3-Tetradecylamine Propyl Amidoxime Collector for Selective Adsorption on the Surface of Smithsonite for Flotation Separation of Smithsonite from Calcite

“…Propyl amidoxime is a derivative of a carboxylic acid that combines an oxime and an amino group in its molecular structure . Because the molecular structure contains the lone pair of electrons of O and N atoms, it can be easily combined with metal ions to form chelates. − As an extremely important metal chelating agent, it is used in a wide range of materials and chemical applications, most notably in the pharmaceutical industry for research into effective drugs for malaria. − Since propyl amidoxime can remove heavy metal pollutants from wastewater and extract uranium from seawater, we tried to use it as a selective flotation collector. − We have constructed the –C­(NOH)­N + H 3 group based on tetradecylamine, which gives tetradecylamine propyl amidoxime (TPA) favorable hydrophobicity and very strong electrical properties with powerful interactions with metal ions.…”

Role of Humic Acid in Enhancing Dissolved Air Flotation for the Removal of TiO2 Nanoparticles

“…Techniques such as carrier flotation and agglomerate flotation have been suggested as ways of increasing flotation rates of colloids and ultrafines. 7,8 The collision dynamics is regarded as one of the most crucial factors deciding the collection efficiency of particles by flotation. 9,10 NPs with diameter less than 100 nm undergo Brownian diffusion, which is considered as the principal NP−bubble collision mechanism.…”

“…Flotation has a great potential in the removal of nanoparticles (NPs) and submicrometer particles from wastewaters. Techniques such as carrier flotation and agglomerate flotation have been suggested as ways of increasing flotation rates of colloids and ultrafines. , The collision dynamics is regarded as one of the most crucial factors deciding the collection efficiency of particles by flotation. , NPs with diameter less than 100 nm undergo Brownian diffusion, which is considered as the principal NP–bubble collision mechanism. When particles are large enough to be unaffected by Brownian motion, i.e., greater than some micrometers, the interception mechanism plays a dominant role; the bubble–​particle collision efficiency rises with the increase of size ratio between particles and bubbles. , …”