The invention discloses a treatment method of a chlorine-containing zinc oxide secondary material, which comprises the following steps: 1) leaching the chlorine-containing zinc oxide secondary material I through an acid solution; 2) selectively extracting zinc through di-(2-ethylhexyl)phosphoric acid (P204)-kerosene solvent; 3) implementing stripping-electrolysis zinc recovery; 4) repeating steps 1)-4); 5) taking out the raffinate obtained from the Step (4), mixing the residual taken out raffinate with chlorine-containing zinc oxide secondary material II when balance on chlorine ion input and taking out is achieved; carrying out liquid-solid separation; leaching the separated deposit through acid raffinate of the step 1); 6) after separated solution achieves preset conditions, purifying the chlorine-containing aqueous phase; 7) evaporating and concentrating to crystallize out KCl and NaCl products. The invention is environment-friendly and energy-saving, and free from process wastewater emission; production cost is greatly reduced and secondary pollution of the current dechloridation process is eliminated thoroughly.

The present invention discloses an extracting agent for separating lithium isotopes and an organic extraction phase containing the extracting agent; the organic extraction phase easily enriches .sup.7Li and achieves the separation of lithium isotopes. The present invention also discloses a high-efficiency method for separating lithium isotopes in an aqueous solution, in which the organic extraction phase of the present invention is used, said organic extraction phase being suitable for single-stage and multi-stage extraction processes.

This invention relates to treated geothermal brine compositions containing reduced concentrations of lithium, iron and silica compared to the untreated brines. Exemplary compositions contain concentration of lithium ranges from 0 to 200 mg/kg, concentration of silica ranges from 0 to 30 mg/kg, concentration of iron ranges from 0 to 300 mg/kg. Exemplary compositions also contain reduced concentrations of elements like arsenic, barium, and lead.

This invention relates to treated geothermal brine compositions containing reduced concentrations of lithium, iron and silica compared to the untreated brines. Exemplary compositions contain concentration of lithium ranges from 0 to 200 mg/kg, concentration of silica ranges from 0 to 30 mg/kg, concentration of iron ranges from 0 to 300 mg/kg. Exemplary compositions also contain reduced concentrations of elements like arsenic, barium, and lead.

A method for the hydrometallurgical recovery of lithium from a lithium transition metal oxide containing fraction of used galvanic cells is disclosed. According to the method, the lithium transition metal oxide containing fraction is introduced into sulphuric acid or hydrochloric acid, and hydrogen peroxide is added in an amount that is at least stoichiometric relative to the transition metal content to be reduced of the lithium transition metal oxide-containing fraction.

To provide a method for recovering lithium, that is capable of efficiently recovering lithium without containing impurities, such as phosphorus and fluorine, from a lithium-containing solution containing lithium hexafluorophosphate and separated from a lithium ion battery. In the present invention, alkali hydroxide is added to the lithium-containing solution and the solution is made to have pH 9 or more, a precipitate of a phosphate and a fluoride salt is formed, the formed precipitate is separated and removed, and then lithium is recovered from filtrate.

A method for the hydrometallurgical recovery of lithium from the fraction of used galvanic cells containing lithium, iron and phosphate is disclosed. According to the method, lithium-iron-phosphate-containing fraction is introduced into sulfuric acid and/or hydrochloric acid, and hydrogen peroxide is added in an amount that is at least stoichiometric relative to the iron content to be oxidized of the lithium-iron-phosphate-containing fraction.

A method of mineralizing calcium from industrial waste comprising extracting calcium ions from a suspension of calcium rich granular particles and aqueous ammonium chloride to form a calcium-rich first fraction and a heavy second fraction. The heavy second fraction is separated from the first fraction and the calcium-rich first fraction is carbonated with a gas comprising carbon dioxide to form a suspension of precipitated calcium carbonate and aqueous ammonium chloride. The precipitate is separated from the aqueous ammonium chloride by centrifugal means and the separated heavy second fraction comprises an enriched weight percent of iron.

This alkali metal and/or alkali earth metal extraction method is superior in terms of cost and allows repeated use of the aqueous solution that extracts alkali metal and/or alkali earth metal from a solid. This method is for extracting alkali metal and/or alkali earth metal from a solid containing an alkali metal and/or alkali earth metal, and involves an elution step in which the solid is added to an amino acid-containing aqueous solution, and the alkali metal and/or alkali earth metal is eluted into the amino acid-containing aqueous solution.

This alkali metal and/or alkali earth metal extraction method is superior in terms of cost and allows repeated use of the aqueous solution that extracts alkali metal and/or alkali earth metal from a solid. This method is for extracting alkali metal and/or alkali earth metal from a solid containing an alkali metal and/or alkali earth metal, and involves an elution step in which the solid is added to an amino acid-containing aqueous solution, and the alkali metal and/or alkali earth metal is eluted into the amino acid-containing aqueous solution.