A kind of method and its application of catalyst prepared by deep processing of rare earth tailings

Abstract

The invention discloses a method for preparing a catalyst through deep processing of rare earth tailings and its application, and belongs to the technical field of catalyst preparation; the invention uses rare earth tailings to prepare a denitrification catalyst with lower cost and better toxicity resistance, and simultaneously recovers the rare earth tailings Medium iron minerals, rare earths, and fluorite minerals make full use of rare earth tailings, avoiding serious waste of resources and environmental pollution; the prepared catalyst has a strong Ce 3+ , Fe 2+ The reduction of low-valent metals and the high proportion of lattice oxygen effectively increase the active sites and oxygen vacancies on the surface, and at the same time have certain anti-toxicity and mechanical strength.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and in particular relates to a method for preparing a catalyst through deep processing of rare earth tailings and an application thereof. Background technique [0002] In recent years, fossil fuel combustion under high temperature conditions, power plants, automobile exhaust, etc. have caused NO x A large number of emissions have caused the greenhouse effect and acid rain, endangering human health and polluting the environment; for this reason, many scholars have devoted themselves to researching effective and low-cost denitrification methods. The denitrification technology currently on the market is not mature enough, and denitrification catalysts have high preparation costs and poor toxicity resistance. , which restricts the practical application in industry, so a new improvement method is proposed. [0003] China's rare earth reserves account for 23% of the world's total, ranking...

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Problems solved by technology

[0002] In recent years, fossil fuel combustion under high temperature conditions, power plants, automobile exhaust, etc. have caused NO x A large number of emissions have caused the greenhouse effect and acid rain, endangering human health and polluting the environment; for this reason, many scholars have devoted themselves to researching effective and low-cost denitrification methods. The denitrification technology currently on the market is not mature enough, and denitrification catalysts have high preparation costs and poor toxicity resistance. , which restricts the practical application in industry, so a new improvement method is proposed

[0003] China's rare earth reserves account for 23% of the world's total, ranking first in the world; Baotou Baiyun Obo Mine accounts for 83% of China's rare earth reserves, which is rich in iron, rare earth, and niobium symbiotic deposits, and rare earths are rich in light such as La, Ce, Sm, and Eu. Rare earth elements; the rare earth tailings left after the beneficiation of rare earth ores contain a total rare earth content of 6.5~7.0%, a total iron content of 12.7~13.2%, and SiO 2 11.4~12.0%, F12.3~12.7%, CaO30.1~30.5%, the main useful minerals are bastnaesite, monazite, iron minerals, fluorite; It is difficult; the rare earth polymetallic oxides in the tailings have excellent SCR catalytic performance after research; the rare earth tailings have been accumulated for many years, and the reserves reach 200 million tons, but due to the complex composition of the tailings and technical reasons, it has not been fully developed. used, and caused serious waste of resources and environmental pollution; this study aims to explore the use of rare earth deep processing recycling to add inhibitors and collectors to prepare a low-cost, green denitrification catalyst, which is a high-addition catalyst for Baiyan Obo rare earth tailings. Value utilization provides new ideas and scientific basis

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