Rare earth-Cu-Fe active carbon adsorbent, preparation method and application thereof

Abstract

The invention relates to a method for preparing a rare earth-Cu-Fe active carbon adsorbent. The method is characterized by comprising the following steps: (1) washing coal active carbon with distilled water, and then washing with ultrasound; and thermostatically drying for 12-24 hours under the temperature condition of 80-120 DEG C; (2) dipping the coal active carbon of the step (1) into a mixed brine solution containing rare earth cerium or lanthanum and transition metal copper or iron, wherein the molar ratio of the rare earth to the copper to the iron is (0.25-0.8):20:1; mixing the active carbon and the brine solution according to the weight ratio of 1:1-1:2, carrying out ultrasound dipping for 40 minutes and then drying for 12-24 hours at a temperature of 80-100 DEG C; and (3) roasting the coal active carbon dried through the step (2) for 2-8 hours at a temperature of 200-600 DEG C so as to obtain the active carbon adsorbent for adsorbing low-concentration hydrogen phosphide gas. Compared with the prior art, the invention has the advantages of simple method and strong operability, improves the purifying efficiency and reduces the purifying cost. When the active carbon adsorbent is in saturated state, waste gas dephosphorization and waste reclamation can be realized. The method has moderate reaction condition and is easy to realize.

Description

technical field [0001] The invention relates to the technical field of adsorption and separation, in particular to a rare earth-Cu-Fe activated carbon adsorbent for purifying low-concentration phosphine, a preparation method and application thereof. Background technique [0002] Phosphine (PH 3 ) is a colorless, foul-smelling gas at room temperature. It is highly toxic and is also called phosphine or phosphine. pH 3 It is mainly produced in the process of yellow phosphorus production, magnesium powder preparation, acetylene production, sodium hypophosphite production, and grain storage fumigation and insecticide. Its emissions will cause air pollution, endanger the environment and human health, and affect the pH 3 The reuse of yellow phosphorus tail gas and calcium carbide furnace tail gas. The purification of yellow phosphorus tail gas to produce high-purity CO technology is the main topic of my country's "Tenth Five-Year Plan" chemical environmental protection research...

AI Technical Summary

Problems solved by technology

[0008] The above methods all have defects such as low dephosphorization accuracy, high energy consumption, low efficiency, complicated process, large investment or secondary pollution, especially for pH 3 The adsorption capacity is not high

The yellow phosphorus tail gas purified by the above method fails to meet the requirements of the one-carbon chemical industry. The yellow phosphorus tail gas is a gas source rich in carbon monoxide, but the comprehensive utilization of the yellow phosphorus tail gas is limited due to its phosphine impurities.