Method for preparing molecular sieve catalyst by using smelting waste steel slag

Abstract

The invention relates to a method for preparing a molecular sieve based catalyst through smelting waste steel slag. The method comprises the steps that firstly, the smelting waste steel slag is dissolved through nitric acid under a heating condition, metal oxide wrapped with silica is dissolved out in a metal ion form, and the original network structure of the smelting waste steel slag is destroyed through treatment; and secondly, ammonia water is used for sedimentating dissolved Si in a silica gel form; and thirdly, ammonia water is used for adjusting the pH of a solution to enable the free metal ions to be sedimentated on the surface of formed silica gel, the molecular sieve based catalyst is obtained through drying and calcination, and therefore the metal oxide can fully make contact with a reaction medium. The molecular sieve based catalyst prepared through the method conforms to requirements of a silica-supported metal oxide molecular sieve based catalyst both in composition and structure, and therefore the molecular sieve based catalyst can be widely used for removing of nitric oxide and hydrogen sulfide and the catalytic cracking, catalytic hydrogenation and biological cracking oil production processes.

Description

technical field [0001] The invention relates to a method for preparing a molecular sieve catalyst by using smelting waste steel slag. Background technique [0002] With the rapid development of China's steel industry, the discharge of steel scrap slag is also increasing. Smelting scrap steel slag is a by-product produced in the process of ore smelting iron and steel, containing elements such as Ca, Al, Fe, Mg, and Si. Arbitrary stacking not only occupies land resources, but also the dissolution of some soluble heavy metal ions will pollute soil and groundwater. Smelting scrap steel slag is rich in some metal oxides and silica, so it is very necessary to rationally recycle the smelting scrap steel slag, which can not only alleviate the shortage of metal resources, but also improve the utilization value of smelting scrap steel slag . At present, there are mainly other ways to recycle smelting scrap steel slag: (1) as construction materials, that is, recycling scrap steel sl...

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Problems solved by technology

[0003] The invention aims to solve the problems of low recovery rate and low added value of smelting scrap steel slag, and provides a technology for realizing high added value utilization of smelting scrap steel slag, and at the same time, utilizes the molecular sieve catalyst synthesized from smelting scrap steel slag to achieve efficient removal of nitrogen oxides and vulcanization The purpose of hydrogen, and used in catalytic cracking, catalytic hydrogenation and biological cracking oil production and other processes