Purification method of dry-type iron oxide powder solid

Abstract

The invention provides a purification method of a dry-type iron oxide powder solid. The method comprises the following steps of: (1) washing iron oxide powder with desalted water; (2) carrying out pressure filtration on the washed iron oxide powder mixed solution to separate solid and liquid while controlling a filtered water content not more than 30 percent; (3) predrying a mud cake obtained in the step (2) until the water content is smaller than 10 percent; (4) breaking; (5) drying in a drying furnace; and (6) grinding in a vibration ball mill. The method can be used for greatly decreasing the C1 (Chemical Index) of the iron oxide powder and improving the physical index BET (Brunauer, Emmett and Teller) and the consistency of the iron oxide powder so that the iron oxide powder can be used as a raw material of a high-end product, i.e. high-permeability ferrite.

Description

technical field [0001] The invention relates to an iron oxide powder purification method, in particular to a dry iron oxide powder solid purification method. Background technique [0002] The solid iron oxide powder in steel mills is mainly obtained by treating the pickling waste liquid and producing it by spray roasting. At present, the RUTHNER roasting process is basically adopted at home and abroad. In order to obtain relatively pure and high-quality iron oxide powder, the pickling waste liquid is purified before entering the spray roasting process (desiliconization process). For example, Chinese patent document 200510027314.1 discloses a wet iron oxide powder purification method, the specific processing steps are: solid iron oxide powder (low silicon or desiliconization)→water washing (de-salinated water)→press filtration (plate and frame type)→preparation Slurry→sand grinding→centrifugal spray drying→package the product. [0003] This process has its unique process ch...

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Problems solved by technology

[0003] This process has its unique process characteristics and advantages, but with the continuous improvement of downstream products such as ferrite for iron oxide powder, it has highlighted two major problems: 1. The representative index of chemical properties (C1) cannot reach The requirements for ultra-high-purity iron oxide powder, and the fluctuation is large, its value is usually between 0.10-0.25%; 2. The representative index of physical properties (BET) is low, generally 2.0-3.5m 2 / g, it cannot meet the requirements for the production of high-permeability ferrite (downstream high-end products), and the consistency is poor

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