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A method for preparing high-quality iron oxide powder using hydrochloric acid pickling waste liquid

A technology of pickling waste liquid and iron oxide powder, which is applied in the field of metallurgy, can solve the problems of unsatisfactory preparation of high-quality iron oxide powder, achieve significant promotion value, reduce time, and increase production capacity

Active Publication Date: 2015-07-29
SHANGHAI BAOSTEEL MAGNETICS
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  • Application Information

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Problems solved by technology

[0005] As for the specific surface area of ​​iron oxide powder, it is mainly controlled by the furnace working conditions of the roasting furnace and the furnace nozzle of the roasting furnace. The BET of the iron oxide powder produced by the existing process is usually less than 3.0, which cannot meet the requirements of high-quality iron oxide powder. preparation

Method used

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  • A method for preparing high-quality iron oxide powder using hydrochloric acid pickling waste liquid
  • A method for preparing high-quality iron oxide powder using hydrochloric acid pickling waste liquid
  • A method for preparing high-quality iron oxide powder using hydrochloric acid pickling waste liquid

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Embodiment 1

[0031] A certain acid regeneration unit has applied the technology of the present invention, and its equipment structure is as follows figure 2 As shown, it includes a waste acid dissolution tower 1, a reaction tank 2, a flocculation reaction tank 3, a pipeline mixer 4, a settling tank 5, a filter press, a collection tank 701, a concentrator 702 and a spray roaster 8 connected in sequence.

[0032] Place silicon nitride ceramic balls I 101 and silicon nitride ceramic balls II 102 with diameters 1.2 to 2 times and 0.8 to 1.0 times the opening diameter of the bottom partition in sequence on the bottom partition of the waste acid dissolution tower; the inlet of waste acid Located at the bottom of the waste acid dissolution tower, the top of the waste acid dissolution tower is connected to the cooler 106, reaction tank 2, flocculation reaction tank 3, pipeline mixer 4, and settling tank 5 in sequence; the upper part of the settling tank is connected to the collection tank 701, and...

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Abstract

The invention provides method of producing high quality ferric oxide powder. A certain proportion of oxide scale is added into a dissolving tower, so that a certain proportion of Fe<3+> exists in the liquor, and the oxidizing reaction time is shortened. On the other hand, the concentration ratio is controlled, so that the total ferric concentration of silicon removing waste liquor is below 250g / L, thereby realizing the purpose of producing the high quality ferric oxide powder. The method provided by the invention has the advantages that the oxidizing reaction time can be shortened, the silicon removal effect can be improved, and the BET (Brunauer, Emmett and Teller) specific surface area of the produced ferric oxide is increased. The BET of the ferric oxide powder obtained reaches up to over 3.0, so that the high quality ferric oxide powder is produced.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to metallurgical machinery, the acid regeneration technology in the metallurgical process and the process for producing iron oxide powder. Background technique [0002] Pickling is an important link in the production process of cold-rolled strip steel. The speed and effect of pickling directly affect the production capacity of the rolling mill and the surface quality of cold-rolled sheets. Hydrochloric acid pickling has the advantages of fast pickling speed and excellent surface quality It has become a mainstream pickling technology in cold-rolled strip pickling. The waste hydrochloric acid after pickling contains a large amount of free acid and high concentration of iron. The direct discharge of this waste liquid not only pollutes the environment but also wastes a lot of precious resources. Therefore, the pickling waste liquid produced by the pickling unit needs to be regenerated. The ba...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G49/06
Inventor 陈元峻赵忠民魏恒赵生军奚国良
Owner SHANGHAI BAOSTEEL MAGNETICS
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