A preparation process of rare earth oxide with specific surface area control

Abstract

The invention discloses a preparation process for controlling the specific surface area of rare earth oxide and relates to the technical field of chemistry. The preparation process comprises the following steps: dissolving gadolinium oxide into a gadolinium chloride solution with the concentration of 1.0M / L by utilizing hydrochloric acid; dissolving industrial oxalic acid with de-ionized water until the concentration is 15 percent and filtering to obtain a precipitant; adding a quarter volume of de-ionized water at 20 DEG C to 25 DEG C into a reaction kettle; adding material liquid and the precipitant and ageing for one hour; after precipitating, pumping away supernatant; unloading sediment into a washing barrel; after continuously washing for a plurality of times, dispersing the sediment into absolute ethyl alcohol and carrying out ultrasonic oscillation for half an hour; carrying out solid-liquid separation by utilizing a centrifugal machine and calcining to obtain a gadolinium oxide product. The specific surface area range of the product is 3m<2> / g to 5m<2> / g and accords with original expectation. The method has a simple process and low cost and the prepared rare earth oxide has a large specific surface area and more stable properties and is suitable for popularization.

Description

Technical field: [0001] The invention relates to a preparation process for controlling the specific surface area of ​​rare earth oxides, which belongs to the technical field of chemical industry. Background technique: [0002] With the development of rare earth materials in the direction of high precision, the quality requirements for rare earth materials are getting higher and higher, and the physical and chemical indicators are becoming more and more strict. The traditional method of oxalic acid precipitation of rare earth feed liquid requires the rare earth feed liquid to be at 0.7mol / L, under normal temperature and normal state, with oxalic acid solution with a concentration of 30-40°C and a concentration of 15%, when the temperature of the water at the bottom of the reaction tank is >80°C, Precipitate at a stirring speed of 180-220r / min, and calcinate the product in a calcination furnace at 850-900°C. The specific surface area of ​​the prepared rare earth oxide is 1-...

AI Technical Summary

Problems solved by technology

The traditional method of oxalic acid precipitation of rare earth feed liquid requires the rare earth feed liquid to be at 0.7mol / L, under normal temperature and normal state, with oxalic acid solution with a concentration of 30-40°C and a concentration of 15%, when the temperature of the water at the bottom of the reaction tank is >80°C, Precipitate at a stirring speed of 180-220r / min, and calcinate the product in a calcination furnace at 850-900°C. The specific surface area of ​​the prepared rare earth oxide is 1-2m 2 / g, the stability is poor, therefore, the preparation specific surface area is 3-5m 2 Rare earth oxide products with good stability between / g have become the focus of current research