Method for dealkalizing red mud by uniting smoke and basic material

Abstract

The invention discloses a method for dealkalizing red mud by uniting smoke and a basic material. The processing method comprises the following steps: grinding and smashing bayer's process red mud, wherein the particle size of the smashed red mud is 160-200 meshes; mixing the red mud and water to form a solid-liquid mixture, wherein the weight proportion of the red mud to the water is (1:3) to (1:10); adding a certain proportion of basic material (acetylene sludge or lime) to react, wherein the reaction temperature is 60 DEG C-100 DEG C and the time is 1-2h; introducing the smoke / simulated smoke to the solid-liquid mixture for acidizing reaction after reaction, wherein the flow of the introduced CO2 is 0.2-1L / min, the flow of SO2 is 20-60mL / min, the reaction time is 60 DEG-80 DEG C, and the time is 1-2h; and carrying out suction filtration on the obtained solid-liquid mixture to separate after the reaction is completed. Separated and processed residual can be used for recycling aluminum and iron and used as a building material with a large scale, the situation that scumming is generated by application of non-dealkalized red mud is solved, and the method provides a solving way for wide application of red mud in building material prospect.

Description

technical field

[0001] The invention relates to a treatment method for dealkalization of red mud, which belongs to the technical field of comprehensive utilization of resources. Background technique

[0002] my country is a big producer of alumina, and the Bayer process red mud is the waste in the process of aluminum production according to the Bayer process route. At present, the comprehensive utilization rate of red mud in my country is relatively low. As my country's alumina production increases year by year and the grade of bauxite gradually decreases, the stockpiles of red mud will continue to increase. Most of the alumina factories at home and abroad transport the red mud to the storage yard, and build a dam for wet storage, which causes soil alkalization, swamping, and pollutes surface and groundwater sources; another common method is to dry and dehydrate the red mud and dry it after evaporation. Stockpile, and still need to occupy land, and at the same time there i...