Adsorbent for simultaneously removing heavy metals and phenol organics in mineral processing wastewater and preparation method thereof

Abstract

The invention discloses an adsorbent for simultaneously removing heavy metals and phenol organics in wastewater. The adsorbent is obtained by modifying bentonite with a quaternary phosphonium salt cationic surfactant and a chelating agent. The invention also discloses a preparation method of the adsorbent. The preparation method comprises the following steps of: 1) throwing the surfactant into water and heating and stirring the surfactant until the surfactant is completely dissolved; 2) throwing original bentonite into the solution and stirring the original bentonite under room temperature; 3) adding the chelating agent and continuing stirring under room temperature; and 4) drying the product after washing and filtering, grinding and sieving the product with a 100-mesh sieve and placing the obtained product in a dryer under room temperature for later use. The adsorbent and the preparation method have the following advantages that the quaternary phosphonium salt cationic surfactant is firstly exchanged into interlayers of bentonite and the chelating agent also enters the interlayers through hydrophobic bond of the cationic surfactant, thus enlarging the layer distances and ensuring the interlayers to have hydrophobicity and enhancing adsorption of the phenol organics; meanwhile, the chelating agent and the heavy metals form coordination complexes; the adsorbent has a good effect on simultaneously removing heavy metals and phenol organics in mineral processing wastewater; and the removal rates of Cd2<+> and phenol organics in the actual mineral processing wastewater are respectively 88.1% and 99.9%.

Description

technical field [0001] The invention belongs to the field of clay mineral processing and utilization, and in particular relates to an adsorbent for simultaneously removing heavy metals and phenolic organic matter in mineral processing wastewater and a preparation method thereof. Background technique [0002] Since entering the 21st century, my country's non-ferrous metal industry has been further developed, and its industrial scale has jumped to the first in the world. In the production process of non-ferrous metal smelting, besides the waste water from metal beneficiation-smelting contains a large amount of heavy metal compounds, due to the use of a large amount of xanthate and black powder in the production process, various organic and inorganic flotation agents are used in ore flotation. The selected chemicals are easy to form organic substances such as phenols after conversion, so the discharged wastewater often contains pollutants such as heavy metals and phenolic organ...

AI Technical Summary

Problems solved by technology

The two types of modification methods commonly used at present have their advantages and disadvantages respectively: the organobentonite modified with quaternary ammonium cationic surfactant has better performance in adsorbing organic pollutants, but it is difficult to remove inorganic pollutants; Inorganic pillared bentonite modified by metal polycations can effectively adsorb inorganic pollutants such as heavy metals, but the adsorption effect on organic pollutants is not very satisfactory

However, the stability, long-term effect and ability to withstand slightly high temperature of bentonite modified by quaternary ammonium salt surfactant and chelating agent are still insufficient