Preparation method of sulfonated coal composite material enriched with lanthanum ions in tailings wastewater

Abstract

The invention belongs to the field of composite materials, and relates to a preparation method of a sulfonated coal composite material enriched with lanthanum ions in tailings wastewater. The preparation method proposed by the invention is to compound the modified sulfonated coal into the pores of the ammoniated sunflower straw, and the specific process includes washing the sunflower straw, ammoniating, modifying the sulfonated coal, and preparing composite materials. Compared with sunflower stalks, the composite material greatly increases the saturated enrichment of lanthanum ions, and can avoid the overflow pollution of organic carbon in sunflower stalks during water treatment. The composite material prepared by the invention increases the enrichment amount of lanthanum ions to 91.9 mg / g, can be used for treating lanthanum-containing wastewater in tailings, and has broad market prospects.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a preparation method of a sulfonated coal composite material enriched with lanthanum ions in tailings wastewater. Background technique [0002] The recovery of rare earths from ionic rare earth ore leachate has its own advantages and disadvantages. The oxalic acid precipitation method is rarely used in industrial production because of its expensive chemical cost and oxalic acid’s toxicity to the environment; the ammonium bicarbonate precipitation method is widely used in rare earth mines, but it cannot be realized with the oxalic acid precipitation method. For continuous production, a sedimentation tank must be built, the production cycle is long, and the recovery cost of low-concentration rare earth leachate is high. Therefore, the low-concentration rare earth leachate has not been recovered, and the obtained oxidized rare earth still needs to be acid-dis...

AI Technical Summary

Problems solved by technology

The oxalic acid precipitation method is rarely used in industrial production because of its expensive chemical cost and oxalic acid’s toxicity to the environment; the ammonium bicarbonate precipitation method is widely used in rare earth mines, but it cannot be realized with the oxalic acid precipitation method. For continuous production, a sedimentation tank must be built, the production cycle is long, and the recovery cost of low-concentration rare earth leachate is high, so the low-concentration rare earth leachate has not been recovered, and the obtained oxidized rare earth still needs to be acid-dissolved to make a rare earth solution

Although the precipitation-flotation method has simple equipment, convenient operation and high efficiency, there are problems such as loss of rare earths during the flotation process, or impurities floating together, poor selectivity of collectors and large dosage.

Although the solvent extraction method can directly produce soluble rare earth salts or rare earth solutions, eliminating the need for processes such as rare earth oxidation and acid dissolution, but for rare earth leaching solutions with low concentration and high impurity content, the organic phase will entrain a large amount of impurities during the extraction process. The impurity content of the product is high and the purity is very low, and the pH value of the system has a great influence on the extraction process

The liquid membrane method has a good enrichment effect and a high recovery rate for low-concentration rare earth leachate, but the impurity ions in the leachate are easy to enter the inner phase of the membrane, and the acidity of the inner phase of the membrane is very high, and the rare earth products obtained after demulsification cannot be directly used as Subsequent extraction and separation of raw materials and other issues