Production method of red mud filler

Abstract

The invention discloses a production method of red mud filler. The method includes the steps of: (1) wet levigation: sending a coarse red mud slurry from a red mud grading process into a grinding machine, conducting wet levigation to obtain a fine red mud slurry; (2) dehydration: bringing the fine red mud slurry into plate-and-frame filter press to press it into a red mud filter cake with a water content of less than 25%; (3) drying: sending the filter cake into a flash dryer to carry out crushing and drying so as to obtain powder with a water content of less than 0.5%; (4) grinding: subjecting the powder to superfine grinding in an impact type superfine powder mill to obtain 1250-6000 mesh superfine powder; (5) grading: grading the superfine ground material by a grader to obtain fine powder; and (6) modification: putting the fine powder into a modification machine, adding a modifier by spraying, and carrying out heat preservation reaction for 20-30min. The method provided in the invention realizes integration of material superfine processing and surface modification, simplifies the process, and no leakage exists in the production process. The method has the advantages of less environmental pollution, fast speed, high efficiency, environmental protection and energy saving, and no secondary pollution.

Description

technical field [0001] The invention relates to the technical field of red mud processing, production and reuse, in particular to a process for producing plastic fillers by using red mud. Background technique [0002] Red mud is the insoluble residue discharged after extracting alumina from bauxite in the alumina industry, that is, the solid waste generated during the production of alumina using bauxite as raw material. These slags are reddish-brown because they are rich in iron oxide. They are called red mud slags, which are hazardous solid wastes. The lower the grade of raw materials, the greater the amount of red mud produced. Its main component is SiO 2 、Al 2 o 3 , CaO, Fe 2 o 3 Wait. With different raw materials and process conditions, the names of red mud are also different, including Bayer red mud, sintering red mud, and combined red mud. In the alumina industry, about 1.2 to 1.8 tons of red mud are produced for every ton of alumina produced. The world’s alumina...

AI Technical Summary

Problems solved by technology

The disadvantage is that the powder obtained by using the process of this invention is only 600-800 mesh, the particle size cannot meet the requirements, the production process is long, and the efficiency is low; the powder obtained after baking is high in energy consumption, and the powder obtained after grinding High iron content and dust pollution