Recovering method for molybdenum and copper in tungsten smelting molybdenum removing slag

Abstract

The invention discloses a recovering method for molybdenum and copper in tungsten smelting molybdenum removing slag. The recovering method comprises the following steps: after mixing the molybdenum removing slag and quicklime, feeding the mixture into a resistance furnace for carrying out calcination, ball-milling calcined clinker until a certain granularity is reached, then leaching with dilute sulfuric acid, filtering to obtain filter residues which mainly comprise calcium sulfate and obtain a leaching solution which is an acid solution containing molybdenum and copper, carrying out mixed extraction with a mixed extractant containing N235 and TBP to obtain a water phase which mainly comprises a copper sulfate solution and can be used for a molybdenum removing procedure, reversely extracting an obtained organic phase with ammonia water after washing with dilute sulfuric acid to obtain a water phase which mainly comprises an ammonium molybdate solution, carrying out evaporation crystallization to obtain an ammonium paramolybdate product, wherein the obtained organic phase can be returned to the extraction procedure to be cyclically used. The recovering method has the advantages that the impurity removing effect is great, the product purity is high, the molybdenum and copper yields reach 98% above, obtained side products can also be cyclically utilized, no pollution is generated, the recovering cost is greatly reduced, and the comprehensive economical benefit is improved.

Description

technical field [0001] The invention relates to the technical field of tungsten smelting, in particular to a method for recovering molybdenum and copper from molybdenum slag in tungsten smelting. Background technique [0002] With the development of science and technology, the dependence on non-ferrous metals such as tungsten is increasing. These non-ferrous metal minerals are non-renewable resources with limited reserves. High-grade minerals are becoming less and less, and resources are increasingly scarce. As people pay more and more attention to resource utilization and environmental protection, the rational development and utilization of tungsten resources and the comprehensive recovery of valuable metals from tungsten smelting slag have far-reaching significance, so the comprehensive recycling of tungsten smelting waste slag is imperative. [0003] At present, selective precipitation is mostly used in tungsten smelting to remove molybdenum. The method is: use sodium sul...

AI Technical Summary

Problems solved by technology

However, due to the complex composition of molybdenum slag, its main components are Cu, Mo, S, and a small amount of WO 3 Wait

The occurrence of these elements is relatively complicated. According to X-ray diffraction analysis, the occurrence of elements in the molybdenum removal slag is as follows: copper mainly exists in the form of CuS, and Mo mainly exists in the form of MoS 4 2- The compounds formed with Cu exist in the form of compounds, and because the compounds formed by CuS, Cu, Mo, and S are difficult to dissolve in dilute acid and alkali solutions, the existing methods for treating molybdenum slag generally have harsh leaching conditions, and molybdenum, molybdenum, and Low copper leaching rate, incomplete recovery, etc.

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