Method for producing polymeric aluminium ferric sulfate solution from industrial waste sulfuric acid generated during purification of acetylene gas and red mud

Abstract

The invention discloses a method for producing a polymeric aluminium ferric sulfate solution from industrial waste sulfuric acid generated during purification of acetylene gas and red mud. The method comprises the following steps: adding water to the red mud to pulp the red mud, mixing the pulped red mud with waste sulfuric acid in a weight ratio of (2-5) to 1, stirring and mixing the materials to react for 1-4 hours to obtain a reaction mixture, standing to leach the mixture for 6-12 hours to obtain leachate, filtering the leachate to obtain filtrate, extracting rare metal impurities in the filtrate with di(isooctyl) phosphate, extracting organic matter impurities in a solution with an extracting agent and alkalifying and polymerizing raffinate to obtain the polymeric aluminium ferric sulfate solution with polymeric aluminium ferric sulfate mass content not less than 8% (in terms of aluminium ferric oxide). The method has the positive beneficial effects that the existing and potential environmental problems caused by discharge of the waste sulfuric acid after neutralizing treatment or direct discharge of the waste sulfuric acid and stacking and storage of the red mud on the land are solved; the polymeric aluminium ferric sulfate product capable of purifying sewage is produced from the waste sulfuric acid and the red mud, thus reducing environmental pollution caused by the waste sulfuric acid and the red mud; the process is simple and is easy to operate, so that the waste treatment cost is reduced; when serving as a flocculating agent, the prepared polymeric aluminium ferric sulfate product has the advantages of high settling time, large flocs, few metal residues and good sewage purifying effects.

Description

technical field

[0001] The invention relates to a method for producing polyaluminum ferric sulfate by using industrial waste sulfuric acid and red mud, in particular to a method for producing polyaluminum ferric sulfate solution by using industrial waste sulfuric acid and red mud produced by purifying acetylene gas. Background technique

[0002] In the production of aluminum ore by Bayer method or sintering method, 1 ton of alumina will produce 1.1-1.5 tons of red mud. With the rapid development of alumina industry in recent years, the global annual discharge of red mud has exceeded 150 million tons. In 2012, China alone produced about 60 million tons of red mud. At present, the disposal methods of red mud in the world are ocean discharge and land storage, and most of our country adopts the latter. The red mud produced is medium-strong alkaline, and the accumulation of red mud will cause some pollution to the groundwater, and the living water and crops of the surrounding re...

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