Determination method for magnets in iron ore

Abstract

The invention discloses a determination method for magnets in iron ore. The method comprises steps as follows: firstly, after magnetic iron ore is crushed, manual repeated magnetic separation is performed, moisture of samples obtained after separation is evaporated to dryness, magnetic iron is enabled to be separated from iron and other impurities, magnets obtained after separation are dissolved by hydrochloric acid, a solution is prepared, the iron element of the solution enters an atomizing system of an inductively coupled plasma emission spectrometer in a form of aerosol, a target substanceis gasified and ionized in a plasma torch, a characteristic spectral line is radiated under excitation, concentration of iron in the solution is calculated according to the Lambert-Beer law, and magnet content of the ore is calculated. The method has no special requirement for nature and composition of the ore, and magnetite, hematite, specularite, limonite, siderite and common metallic ore are all suitable for the method. The method further has the advantages of high analysis speed, low cost, high efficiency, simple and flexible technological process, low energy consumption and the like, andthe application prospect is quite broad.

Description

technical field [0001] The invention relates to the technical field of analysis and determination of chemical substances, in particular to a method for determining magnets in iron ore. Background technique [0002] The average content of iron in the earth's crust is 5.63%. Iron is one of the most widely distributed elements in the earth's crust, and it is also one of the earliest known and used elements in production and life. Iron element is usually positive 2 valence, positive 3 valence, and very few is positive 6 valence. Iron is a silver-gray metal with medium active chemical properties and usually exists in the form of oxides in nature. Iron is the basic raw material of the iron and steel industry, which is closely related to modernization and the daily life of residents. Iron ore is the main source of iron. At present, iron ore mainly includes magnetite, hematite, specularite, limonite, Five kinds such as siderite, among which mFe / TFe>≧85% are called magnetite. Be...

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Problems solved by technology

[0004] The determination methods for the selected magnetite minerals mainly include: xanthyl salicylic acid colorimetric method, atomic absorption spectrophotometry, potassium dichromate volumetric method, etc., wherein xanthyl salicylic acid colorimetric method is more suitable for magnets with lower content. However, colorimetry is greatly affected by temperature, pH, and environmental conditions; atomic absorption spectrophotometry is suitable for the determination of samples with lower content. Due to the interference of iron ore spectral lines measured by atomic absorption spectrophotometry, the background interference is serious, and the standard curve The range is small, and the measurement error for high-content magnets is large; the potassium dichromate volumetric method is suitable for the determination of magnets with higher samples, and has good accuracy, but for lower samples, the accuracy is poor, and the volumetric method needs Sodium peroxide is used as a strong corrosive reagent, which has high safety requirements for operators. For samples with low content, the volumetric measurement results are too high

[0005] To sum up, at present, the magnet determination method in iron ore is still mainly selected according to the content of magnet in the mineral, and there is no complete set of detection methods suitable for the detection of magnet in most iron ores.

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