Method for preparing magnetic sludge-based biochar material from sludge and application of magnetic sludge-based biochar material

Abstract

The invention discloses a method for preparing a magnetic sludge-based biochar material from sludge and the application of the magnetic sludge-based biochar material, and belongs to the technical field of sludge resource utilization. The invention aims to fully utilize municipal and industrial wastes such as sewage sludge, hematite, rust, Bayer process red mud, high-iron-content fly ash, picklingwastewater and the like, and prepare magnetic sludge-based biochar from a solid waste iron source: dried sludge with the water content of less than 15% and a solid iron source are mechanically crushedand uniformly mixed; continuous pyrolysis is carried out, the pyrolysis temperature is 400-800 DEG C, the solid material stays in the device for 20-120 min, and fine ball milling and smashing are carried out until the particle size is 100 [mu] m or below; in the nano Fe3O4 / magnetic sludge-based biochar core-shell material prepared by the method, both the material core and the shell have magnetism, so that efficient recycling can be realized.

Description

technical field

[0001] The invention belongs to the technical field of sludge resource utilization, and in particular relates to a method for preparing a magnetic sludge-based biochar material from sludge and an application thereof. Background technique

[0002] With the rapid growth of my country's sewage treatment scale, the output of sewage sludge has exceeded 30 million tons per year, and it is urgent to develop technologies for safe sludge treatment, disposal and resource utilization. At present, the material utilization of sewage sludge mainly includes the preparation of adsorption materials, catalytic materials and soil improvement materials. At present, adsorption materials and catalytic materials prepared from sludge generally have problems such as high preparation cost, low material performance, low material added value, and poor adaptability, making it difficult to achieve large-scale application. Nano-magnetic core-shell materials have high specific surface area...