Method for Determination of Elemental Components in Sulfur-Cobalt Concentrate and Sample Digestion Method

Abstract

The invention relates to a method for determining elementary composition of cobalt pyrite concentrate and a digestion method for a cobalt pyrite concentrate sample, belonging to the field of detection and analysis technology. To overcome technical problems in the prior art, the invention provides the digestion method for the cobalt pyrite concentrate sample. The digestion method comprises the following steps: weighing the cobalt pyrite concentrate sample, putting the sample in a container, directly adding water, concentrated nitric acid, hydrofluoric acid and hydrogen peroxide in sequence and then enclosing the container; carrying out gradient heating in three stages by using microwave heating so as to realize digestion; and after completion of digestion, carrying out cooling and then carrying out diluting with water until a volume is fixed so as to obtain a sample detection solution. Compared with the prior art, the digestion method provided by the invention has the advantages that operation is simple and fast; sample digestion is rapid and complete; reagents are simple and low in consumption; few examination steps are needed; flow is short; ICP-OES realizes simultaneous determination of gas, metallic elements, major elements and trace elements; technological performance indexes are excellent; and the range of detection elements and contents is wide; etc.

Description

technical field [0001] The invention relates to a method for determining elemental components in sulfur-cobalt concentrate and a sample digestion method thereof, belonging to the technical field of detection and analysis. Background technique [0002] Cobalt concentrate is mainly used in the alloy industry to produce cobalt sulfate, cobalt chloride, cobalt carbonate, cobalt oxide, metal cobalt, tungsten-cobalt alloy, cobalt magnetic alloy, as well as in the electronics industry as positive electrode materials for cobalt-lithium batteries or in the chemical industry Used as a catalyst, etc. [0003] There are not many cobalt ore resources in China, and cobalt ore and cobalt concentrates have always relied on imports to meet the growing domestic demand. There are especially few independent cobalt deposits in my country, which are mainly produced together with iron, nickel, copper and other minerals as associated minerals. The sulfide ore belt of vanadium-titanium magnetite i...

AI Technical Summary

Problems solved by technology

This type of method has disadvantages such as complex operation, volatile loss of silicon, sulfur, arsenic and other elements, large sample consumption, long analysis process and time-consuming, etc. Sulfur-cobalt concentrate produced by screening and enriching mineral resources, due to the coexistence of high content of refractory elements such as sulfur, carbon, chromium, titanium, aluminum, silicon, etc. in the form of sulfide or other forms, causes such Sulfur-cobalt concentrate samples are particularly difficult to quickly digest; the other is to use fire melting and digestion, that is, lithium tetraborate, sodium carbonate, boric acid, sodium peroxide and other basic fluxes are melted and digested in a muffle furnace at high temperature. Then dissolve and leach salts with hydrochloric acid and other solutions to carry out element content analysis.

This type of method introduces a large amount of alkali metal ions such as lithium or sodium, and greatly increases the salt concentration of the solution, resulting in matrix effects, background noise and other interference factors that seriously affect the accurate determination of element content.

Images