Search results for "liuotus"

showing 3 items of 13 documents

Dry chlorination of spent nickel metal hydride battery waste for water leaching of battery metals and rare earth elements

2022

An efficient leaching process was developed for nickel, cobalt, and the rare earth elements (REEs) from spent nickel metal hydride (NiMH) battery waste. The process involves dry chlorination with ammonium chloride in low temperature to produce water-soluble chlorinated compounds, followed by simple water leaching. The factors affecting the conversion and solubilization were studied, including the amount of ammonium chloride, residence time and temperature in dry chlorination, and solid to liquid ratio, time and temperature in water leaching. As a result, the dry chlorination process was found to produce ammonium and chloride containing products, depending on the temperature of the process: …

prosessitkloriditProcess Chemistry and TechnologyNiMHharvinaiset maametallitPollutionakutympäristöystävällisyysdry chlorinationnikkelimetallihydridiakutjätteiden hyötykäyttöliuotusbatteryChemical Engineering (miscellaneous)kobolttinikkeliWaste Management and Disposal

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Kuparin, hopean ja palladiumin talteenotto piirilevyjätteestä

2017

Tutkielmassa käsitellään rikkihapon käyttöä sähkö- ja elektroniikkaromuun kuuluvan piirilevyjätteen liuotuksessa ja rikkihappoon liuenneiden metallien talteenottoa erilaisin menetelmin. Sähkö- ja elektroniikkaromu on pian maailman suurimmaksi kasvava jätevirta, jolla on sekä ympäristöllisiä että taloudellisia vaikutuksia, jos romun sisältämiä metalleja ei saada kierrätettyä. Elektroniikkalaitteiden piirilevyt sisältävät noin 60 % metalleja, joiden talteenottamiseksi on lähiaikoina tehty paljon tutkimusta. Piirilevyjen sisältämiä arvokkaita metalleja ovat erityisesti kulta, hopea, palladium ja platina. Rikkihappo on yleisin teollisuudessa käytetty happoliuotin, …

rikkihappopiirilevythydrometallurgiahopeametallisiepparitkuparipalladiumWEEEjalometallittalteenottoliuotussähkö- ja elektroniikkaromuerottaminen (tekniikka)elektrolyysi

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Method development for determination and recovery of rare earth elements from industrial fly ash

2014

Rare earth elements (REE) are important in numerous high technology applications and in addition their supply risk is high, which gives rise to studying new sources for rare earth elements. Rare earth element concentrations in industrial fly ash samples collected from Finnish power plants, using a mixture of peat and biomass as a fuel, have been determined. Two sample pre-treatment methods, ultrasound- and microwave-assisted acid digestions, have been applied to fly ash samples. Measurement conditions for inductively coupled plasma-optical emission spectrometry (ICP–OES) have been optimized to reach robust plasma conditions and the reliability of the analysis has been investigated by using …

saostusliquid-liquid extractionteollisuusjätteetprecipitationharvinaiset maametallitrobust plasmamittausmenetelmätleachingrare earth elementfly ashspektrometriaerotusmenetelmätpitoisuusliuotusICP-OESlentotuhkaoptimization

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