Preparation method of red mud sinking agent

Abstract

The invention relates to a preparation method of a red mud sinking agent, which comprises the following steps of mixing acrylamide, acrylic acid and urea with deionized water in weight percent, cooling and regulating the pH value to end the material preparation; mixing the ingredients, chelating agent and chain transfer agent in a reaction kettle, sequentially adding a third section oxidant, a second section oxidant, a first section oxidant, a reducer and an auxiliary reducer in nitrogen introducing process, continuously introducing nitrogen, and than stopping nitrogen introduction, sealing, and carrying out insulation polymerization reaction; opening a reaction kettle bottom valve after being placed, pressing out a rubber block by compressed air and disintegrating the rubber block into colloidal particles by a granulator; and hydrolyzing the colloidal particles, and preparing a product through treatments of granulation, drying, crushing, screening and packaging. The aluminum oxide plant red mud sinking agent has the advantages of high molecular weight, fast dissolving speed, high hydrolysis degree and low cost.

Description

technical field [0001] The invention relates to a preparation method of a red mud sedimentation agent, which belongs to the field of water-soluble polymer synthesis. Background technique [0002] In the process of converting alumina in bauxite in alumina plant into soluble aluminate, a large amount of slurry and slag liquid mixture formed by aluminate solution and red mud will be formed. Production requires that aluminate and red mud must be quickly Separation to reduce the loss of alumina and alkali, while obtaining relatively pure aluminate solution. At present, this process mostly uses settling tanks and filters to separate red mud and slurry. In order to speed up the settling speed of the red mud in the settling tank and increase the production capacity of the settling tank, a settling agent should be added to speed up the settling speed. The precipitating agents used in the past mainly include pure sodium polyacrylate, polyacrylamide, emulsion polyacrylamide, flour pa...

AI Technical Summary

Problems solved by technology

No matter which one of the above is used as a red mud sedimentation agent, there are major disadvantages. Due to the low degree of hydrolysis and poor resistance to high temperature and high alkali, partially hydrolyzed polyacrylamide is easily degraded when used as a red mud sedimentation agent, making the added The amount is large; sodium polyacrylate has a strong ability to resist temperature and high alkali, but its solubility is poor, the molecular weight is low, and the use effect is not good; the emulsion type partially hydrolyzed polyacrylamide is easy to use, but it has the same properties as partially hydrolyzed polyacrylamide Disadvantages, but also the pollution of organic solvents