Process for producing iron oxide red by dry method

Abstract

The invention discloses a process for preparing iron oxide red, particularly the process for preparing the iron oxide red by a dry method, which comprises the following steps: A. purifying steel scale, removing dense iron ores and bigger foreign bodies by screening and removing smaller impurities by magnetic separation; B. drying and removing oil at high temperature under the condition of controlling the process temperature to be equal to or higher than 160 DEG C; C. breaking the material roughly after high-temperature drying to cause the grain diameter to meet the requirement of primary oxidation that the -200-mesh discharging grain size reaches more than 90 percent, and carrying out rough breaking again if the requirement of primary oxidation is not met; and D. carrying out primary oxidation after rough breaking to obtain the iron oxide red with the process temperature of 900 plus or minus 20 DEG C. The process has the advantages of oil removal, light pollution, small occupied area, high output and low energy consumption.

Description

technical field [0001] The invention relates to a process for manufacturing iron oxide red, in particular to a dry process for manufacturing iron oxide red. Background technique [0002] With the rapid development of enterprise technology, from the perspective of cost saving and recycling, there will be less and less cold-rolled pickling iron shot as a subsidiary product of cold rolling, making it more and more unfeasible to produce high-quality iron oxide red with pickling iron shot. The main technical indicators of high-quality iron oxide red are divided into: Fe 2 o 3 ≥98.5%, the average particle size (1.9~2.2μm), and the impurity content in the product is very low. [0003] In the powder metallurgy industry, the prior art is to utilize iron sheet wet processing to produce iron oxide red. The disadvantage of this process is: in the process of wet grinding, it must reach the standard of ultrafine particle size (μm level), and the standard of high-quality iron oxide red ...

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Problems solved by technology

The disadvantage of this process is: in the process of wet grinding, it must reach the standard of ultrafine particle size (μm level), and the standard of high-quality iron oxide red can only be achieved in the subsequent oxidation process; the waste water generated by wet grinding is difficult Reuse, even if the waste water is recycled, its cost is high. Because the waste water produced by wet grinding has a high cost of recycling, it is mostly discharged directly, which causes great environmental pollution; wet grinding cannot continuously feed materials, and the work belongs to intermittent production, and the output is small; In the process of filtering and drying, there must be enough space, which occupies a large production site; in the wet method, because the powder is small and the specific gravity is very light, and the powder and oil are fully mixed in the previous process, so in the wet method It is difficult to remove oil during drying, which easily affects product quality. While removing water, part of the powder will float into the air, which not only causes pollution but also reduces production.

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