Method for extracting nickel and molybdenum from nickel-molybdenum ore acidic leaching solution

Abstract

The invention relates to a method for extracting nickel and molybdenum from nickel-molybdenum ore acidic leaching solution, comprising the steps of: 1) adding phosphoric acid to the acidic leaching solution of nickel-molybdenum ore to convert molybdenum in the solution into phosphomolybdenum heteropolyacid; 2) Using TBP as an extractant to extract the phosphomolybdenum heteropolyacid to obtain the organic phase containing the phosphomolybdenum heteropolyacid; and then back-extracting with ammonia water to obtain a molybdenum-containing stripping solution; 3) at a temperature of 90-95°C Add sulfuric acid to the raffinate after TBP extraction. When the concentration of nickel sulfate reaches 150-200g / L, cool down to room temperature to precipitate nickel sulfate crystals. The filtrate after solid-liquid separation can be used for the acidity of nickel-molybdenum ore. leach. By changing the occurrence state of molybdenum in the acidic solution, the effective extraction of molybdenum and nickel in the high-acid solution can be realized without adjusting the pH value of the solution. The invention has short process flow, simple and convenient operation, low production cost and easy industrialization.

Description

technical field [0001] The invention relates to the technical field of extraction metallurgy of nonferrous metals, in particular to a method for extracting nickel and molybdenum from nickel-molybdenum ore acidic leaching solution. Background technique [0002] There are two ways of wet leaching of nickel-molybdenum ore: stepwise leaching and synchronous leaching. Alkali leaching of molybdenum-acid leaching of nickel is often used in step-by-step leaching, which has a long process flow, large reagent consumption, and high production costs. Therefore, in order to extract nickel and molybdenum resources more efficiently, many scholars have developed a simultaneous leaching technology for nickel and molybdenum. Wang Sifou and others used high-pressure acid leaching process to treat nickel and molybdenum ore, so that almost all nickel and most of molybdenum entered into the nickel molybdenum ore at the same time. In the leaching solution, the simultaneous leaching of nickel and ...

AI Technical Summary

Problems solved by technology

The chemical precipitation method needs to add alkali to neutralize the acidic leaching solution, which consumes a lot of alkali, and the impurity content in the molybdenum precipitation product is high; the ion exchange method also needs to add alkali to the acidic leaching solution to adjust the pH to 3-4 before the adsorption of molybdenum , the alkali consumption and the amount of waste water are large; the study of extracting molybdenum from acidic leaching solution by solvent extraction method is the most extensive, and the effect of extracting and separating nickel and molybdenum from acidic leaching solution by N235 is good, but the pH of the feed solution is required to be between 2 and 3 , Molybdenum cannot be recovered from the acidic leaching solution with an acid concentration of 1-6 mol / L