Red mud granulation, solidification and dealkalization method

Abstract

The invention discloses a red mud granulation, solidification and dealkalization method, red mud is solidified and clustered through a hydraulic cementing material to prepare spherical particles, then the spherical particles are soaked and dealkalized, and powder raw materials in the spherical particles comprise the following components in parts by mass: 80-90 parts of red mud and 10-20 parts of a hydraulic cementing material. The preparation method comprises the following steps: adding water and the water reducer into the powder raw material according to the ratio at normal temperature, stirring to form a dry and thick paste, wherein the water accounts for 15-20% of the powder raw material, and the water reducer accounts for 0.5-1% of the powder raw material, pelleting the paste into spherical particles by a pelleting machine, fully curing the spherical particles, washing and soaking the spherical particles for 0.5-1 hour so as to fully dissolve soluble alkali out, and filtering out the soaking filtrate to realize solid-liquid separation, thereby achieving the purpose of red mud water elution and dealkalization. The invention solves the problems of high water content of ultrafine powder, difficulty in filter pressing and dehydration and low dealkalization efficiency in the red mud water washing and dealkalization process; and the red mud subjected to granulation treatment has the characteristics of light weight and high strength, and can be directly added into a building material product as a lightweight aggregate.

Description

technical field [0001] The invention belongs to the technical field of solid waste treatment, and in particular relates to a red mud granulation and solidification dealkalization method. Background technique [0002] Red mud is a strong alkaline solid waste discharged during the alumina production process. my country's annual red mud discharge is nearly 100 million tons, and the total red mud stockpile exceeds 600 million tons. Due to the strong alkalinity and high water content of red mud, the accumulation of a large amount of red mud will bring harm to human health and the natural environment. harm. Nowadays, damming and dumping of seawater are commonly used at home and abroad to deal with red mud. Damming and stacking will not only occupy a large amount of land resources, but also heavy metals in red mud will penetrate into the soil and surface water during the stacking process, causing water pollution, Soil salinization etc. In addition to the direct pollution of subst...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies in the prior art, the present invention provides a red mud granulation and solidification dealkalization method, which has simple process and high dealkalization efficiency, fundamentally solves the problem of a large amount of red mud stockpiling, and can be obtained from the filtered Extract valuable metals such as sodium from red mud to realize secondary resource recycling