Preprocessing method of fluorine-containing iron ore

Abstract

The invention relates to a pre-processing method of fluorine-containing iron ore. The preprocessing method mainly comprises the following steps of (1), compounding: grinding and uniformly mixing the fluorine-containing iron ore with alkali metal hydroxide; (2), preprocessing ingredients: stirring, mixing and drying the uniformly mixed ingredients with aqueous solution of alkali chloride; (3), sintering at low temperature: roasting the pre-processed ingredients at 180-220 DEG C for more than 0.5h; (4), primarily washing: stirring and cleaning a material sintered at low temperature by using the aqueous solution of alkali chloride; (5), secondarily washing: stirring and cleaning the material washed for the first time by using water; and (6), drying: drying the materials washed for two times. The preprocessing method of the fluorine-containing iron ore disclosed by the invention is simple in process; fluorine ions are easily dissociated out from the fluorine-containing iron ore and absorbed by the aqueous solution of washing liquid chloride; the weight percentage content of fluorine in the washed fluorine-containing iron ore can be reduced to 0.25%; the preprocessing method is low in roasting temperature and energy consumption; and generation of a part of toxic fluorides while roasting at high temperature can be avoided.

Description

technical field [0001] The invention belongs to the field of chemical metallurgy, and in particular relates to a pretreatment method of fluoride-containing iron ore. Background technique [0002] The Baiyun Obo Mine in Inner Mongolia, my country, is a super-large iron ore deposit that has been discovered so far with abundant ore reserves, but its element composition is various and complex, and contains many harmful elements, and fluorine is one of them. On the one hand, fluorine is a harmful element in the metallurgical process. The existence of fluorine obviously affects the melt properties in the sintering process and affects the strength and performance of sintered ore; 4 , HF, or fluorine-containing dust discharge into the atmosphere will cause fluorine pollution. In order to reduce the fluorine content in fluorine-containing iron ore, the mineral processing process is usually applied, firstly through the magnetic separation process and then through the flotation proces...

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Problems solved by technology

[0003] In order to solve the above problems of removing fluorine from fluorine-containing iron ore by adopting flotation process, the operation procedure is complicated, there are many influencing factors, the control force for the screening and removal of fluorine element is poor, and the fluorine removal rate is low, the present invention provides a method as follows Low-temperature roasting of fluoride-containing iron ore through the combination of alkali metal chloride and alkali metal hydroxide strong alkali, and then washing the roasted material with an aqueous solution of alkali metal chloride to pre-defluoride the fluoride-containing iron ore New technical solutions for processing:

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