Method for directly synthesizing high-purity bornite through solid-phase reaction

Abstract

The invention discloses a method for directly synthesizing high-purity bornite through a solid-phase reaction. The method comprises the following steps: weighing analytically pure cuprous sulfide, copper sulfide and analytically pure ferrous sulfide according to a molar ratio of 2: 1: 1, and carrying out grinding and uniform mixing to obtain an initial raw material; pressing mixture powder into acylinder, covering the end face of the cylinder with a powdered sulfur wafer, filling platinum-graphite double sample cavities with the powdered sulfur wafer, the mixture cylinder and the powdered sulfur wafer in sequence, sealing the platinum-graphite double sample cavities to prepare a sample, and placing the sample in an h-BN pipe, wherein h-BN serves as a pressure transmission medium; and carrying out high-temperature and high-pressure reaction in a large cubic press, taking out the reacted cylindrical sample, carrying out grinding and polishing, then carrying out ultrasonic cleaning and air drying, and storing the cylindrical sample in an inert gas atmosphere. The obtained bornite is of a single phase and is free of impurities.

Description

technical field [0001] The invention relates to a method for directly synthesizing high-purity bornite by solid phase reaction, which belongs to the field of mineralogy research. Background technique [0002] Bornite is a common copper-iron sulfide mineral, often in dense massive or dispersed granular form, and is enriched in chalcopyrite, chalcocite and other sulfides in porphyry copper deposits of hydrothermal origin, and its copper content is as high as 63.3%, is one of the main mineral raw materials for refining copper. Due to its high copper content, bornite is relatively unstable in chemical properties compared with chalcopyrite, and is easily weathered and oxidized on the surface to form malachite and azurite. In addition, the formation of bornite strongly depends on the ambient temperature, and it is easy to decompose into sulfides such as chalcocite and chalcopyrite when the temperature is high. Therefore, the composition of natural bornite is very complex, and of...

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Problems solved by technology

Therefore, although the vacuum tube can avoid the oxidation of sulfide, since the open system cannot solve the problems of desulfurization reaction and sulfur volatilization, it is actually difficult to carry out the solid-phase reaction according to the ideal ratio of bornite, and the purity of the product cannot be guaranteed.