A method for preparing porous material from rare earth tailings

Abstract

The invention provides a method for preparing porous materials with rare earth tailings. The method is characterized by mixing the rare earth tailings with cement in a mass ratio of (2-4):(8-6), adding lithium carbonate, starch and potassium permanganate, adding H2O2 after stirring the materials and curing the product for 20-30 hours under the condition of standing. The method has the beneficial effects that comprehensively considering the characteristics of the chemical components of the rare earth tailings, the rare earth tailings replace part of cement, the basic raw materials are debugged by adding the additive, the ratio of the raw materials to the additive to an activator to a foaming agent is adjusted and each link in the preparation process is strictly controlled, so that the foaming speed is matched with the matrix setting time, thus preparing the rare earth containing porous materials which have pore diameters less than 1mm, are uniform in bubble distribution and have low density and high strength; the method is short in process flow, simple in equipment and easy to operate and can take full advantage of the industrial solid wastes, namely the rare earth tailings; the obtained products have wide ranges of application, high added values and the environmental protection function.

Description

technical field [0001] The invention relates to the field of comprehensive utilization of slag, in particular to a method for preparing materials using blast furnace slag. Background technique [0002] my country is rich in rare earth resources. In the early 1980s, my country's rare earth reserves accounted for more than 70% of the world's total rare earth reserves. The percentage of total rare earth reserves has dropped to around 30%. Although the percentage of my country's rare earth reserves in the world's total reserves is declining, the proportion of my country's rare earth mineral products in the world's total rare earth mineral products remains high. In 2007, the output of rare earth products in my country reached 120,800 tons, accounting for about 97% of the world's output of rare earth mineral products; the export volume of rare earth products reached 49,000 tons, accounting for more than 90% of the global trade volume of rare earth products, so the export of low-en...

AI Technical Summary

Problems solved by technology

However, the current recovery method of rare earth in rare earth tailings has the disadvantages of long process flow, many rare earth form transformation steps, high energy consumption, etc., and the generated waste acid, waste alkali and waste gas are easy to pollute the environment.

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