Chemical analysis method for determining chloride ions in metal copper by restraining specific ion behaviors through generated molecular crystals

Abstract

The invention belongs to the field of chemical analysis, and particularly discloses a chemical analysis method for determining chloride ions in metal copper by restraining specific ion behaviors through generated molecular crystals, which well solves the problem of determination of the content of chloride ions in a metal-containing sample, and is simple to operate and high in accuracy.

Description

technical field [0001] The invention belongs to the field of chemical analysis, and relates to a method for determining chloride ions, in particular to a chemical analysis method for determining chloride ions in metal copper by using generated molecular crystals to constrain specific ion behavior. Background technique [0002] Blister copper is further smelted through matte during the smelting process. Due to its high content of impurity elements, it cannot be used directly. It is generally used as the raw material of electric copper; It will be flotation, so it will be stripped out. Generally, it is oxidized and leached with acid. After copper ions enter the leaching solution, it will be reduced to produce coarse copper powder. Its content of impurity elements is high and cannot be used directly. It needs further refining and purification. [0003] The above two kinds of metal copper generally contain a considerable concentration of chloride ions. If they are not removed in...

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Problems solved by technology

[0002] Blister copper is further smelted through matte during the smelting process. Due to its high content of impurity elements, it cannot be used directly. It is generally used as the raw material of electric copper; It will be flotation, so it will be stripped out. Generally, it is oxidized and leached with acid. After copper ions enter the leaching solution, it will be reduced to produce crude copper powder. Its content of impurity elements is high and cannot be used directly. Further smelting and purification

[0003] The above two kinds of metal copper generally contain a considerable concentration of chloride ions. If they are not removed in the further smelting and purification process, the chloride ions will affect the product quality of electric copper during copper electrolysis, and even have a destructive effect on production equipment; therefore Before further smelting and purification of the above two kinds of metal copper, it is necessary to know the specific content of chloride ions. Since most of the chloride ions are melted and wrapped inside the metal copper as chloride salts, the chemical analysis of the chloride ion content in the metal copper It becomes difficult to detect

[0004] At present, it is known that the relatively mature sample dissolution method for testing chloride ions is the Escal reagent semi-sintering method, but this method is more effective for natural mineral or compound samples, and has little effect on samples mainly composed of metals.

The main reason is that during the sintering process, it converts all insoluble salts of chlorides into carbonates with smaller volumes, and converts chloride ions into water-soluble sodium chloride for leaching; The conversion rate is small, so this method is not suitable for the determination of chloride ions in metal-containing samples

[0005] In addition, if the above two metal copper samples are directly leached by acid-dissolving method, the chloride ions wrapped by the metal can be released, but during the dissolution process, due to the need for heating and the heat release of the chemical reaction itself during the reaction process, the solution will The free chlorine ions dissociated in the solution will be volatilized and lost in the form of hydrogen chloride, resulting in low analysis results

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