Technological method of using alumina byproduct red mud for producing polyvinyl chloride (PVC) packing

Abstract

The invention relates to a technological method of using alumina byproduct red mud for producing polyvinyl chloride (PVC) packing. The technological method mainly comprises the following steps that red mud slurry is fed into a dealkalizing activating reaction tank, then composite dealkalizing agents are added into the red mud slurry, and the dealkalizing activating treatment is carried out; dealkalized red mud is delivered to an iron selection working section and a sand extraction working section, and iron selection is finished through a first-stage high gradient magnetic separator and a second-stage high gradient magnetic separator; separation of coarse sand and fine sand is finished through a coarse sand and medium sand mineral dressing spiral chute; then the red mud is washed through a vacuum washer, activated through carbon dioxide and pressed into a red mud filter cake through a high-pressure filter press, and the water content of the red mud filter cake is lower than 25%; the filter cake is crushed into 5-to-10-millimeter bulk materials through a jaw crusher, and the bulk materials are dried, ground into powder, graded and then delivered into a filler bin; and the last step is packaging and warehousing, namely products in the filler bin are detected, classified, packaged and then delivered into a finished product warehouse. The products produced through the technological method of using the alumina byproduct red mud for producing the PVC packing can enhance the corrosion-resisting property, the shock-resisting property, the flam-retarding property and other properties of PVC.

Description

technical field [0001] The present invention relates to the industrial production of Al 2 o 3 The technical field of red mud processing, production and reuse of by-products is specifically a process for producing PVC fillers by using red mud by-product of alumina. Background technique [0002] Red mud is a waste product produced during the extraction of alumina from bauxite. Regardless of the sintering method, Bayer method or combined method, the common environmental problems of red mud are dusting and alkali leakage. In the Bayer process, bauxite is crushed, and then enters wet grinding together with lime and circulating mother liquor to make qualified pulp. After pre-desilication, the pulp is preheated to the dissolution temperature for dissolution. The leached ore pulp enters the process of dilution and sedimentation and separation of red mud (solid phase residue after leaching) after self-evaporating and cooling down. After sedimentation and separation, the red mud ...

AI Technical Summary

Problems solved by technology

This not only occupies a large amount of land resources, but also causes serious alkali pollution to the ecological environment, such as soil, water body and groundwater

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