Preparation method of water dephosphorization porous ceramic filter ball

Abstract

The invention belongs to the technical field of environment protection and discloses a preparation method of a water dephosphorization porous ceramic filter ball. Typical solid waste is used as a rawmaterial for collaborative treatment. The method includes: pretreating a raw material, controlling raw material grain size, and grading; uniformly mixing the raw material to obtain paste; granulating,and aging; performing gradient temperature-controlled calcining, wherein the raw material is composed of, by mass, 21-65% of Bayer-process red mud, 9-38% of urban domestic waste incinerator slag, 4-23% of excitant, 3-15% of pore forming agent and 5-10% of binder. The porous ceramic filter ball prepared by the method has the advantages of high porosity, uniform pore distribution, large specific surface area, high water absorptivity, high dephosphorization ability and speed and resistance to hydraulic impact, is excellent in various physiochemical properties, can be applied in water dephosphorization and can realize solid waste cooperative treatment and recycling and reduce solid waste accumulation.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a preparation method of porous ceramic filter balls for phosphorus removal in water bodies. Background technique [0002] Water body phosphorus removal porous ceramic filter ball is an important medium for adsorption phosphorus removal. In the prior art, based on the idea of ​​waste recycling, a scheme for preparing phosphorus removal materials using waste as raw materials has been developed. A large number of by-products inevitably produced in metal smelting contain metal oxides and have a large specific surface area, which can be used as an efficient phosphorus removal material. Secondary pollution; domestic waste incineration slag has a stronger adsorption capacity for phosphorus as the particle size decreases, but the desorption capacity decreases as the particle size decreases, which is not conducive to regeneration, and there is a risk of heavy metal leach...

AI Technical Summary

Problems solved by technology

The main factors affecting the adsorption performance of porous ceramics include effective porosity, specific surface area, metal oxide content, and anti-powdering rate. Due to the fine particle size of raw materials, it is difficult to mix evenly, which reduces the success rate of ceramsite; traditional pore-forming agents such as starch, etc. Organic pore-forming agents, carbon powder and other inorganic pore-forming agents are introduced as the second phase, and it is not easy to mix evenly, and sintering shrinkage occurs during the sintering process, resulting in uneven distribution of pores and partial closure, which affects the phosphorus removal effect; in addition, some pore-forming agents Under high temperature conditions, it is easy to produce toxic gases, which is not conducive to environmental protection; the preparation of phosphorus-removing ceramsite must not only ensure that the effective porosity is large enough, but also have strong abrasion resistance. Therefore, according to the composition of the main raw materials, silicon and calcium should be added. Substances are adjusted to build Al 2 o 3 -CaO-SiO 2 Ternary phase pottery system, the addition of non-solid waste materials is bound to increase the environmental burden, which is not conducive to sustainable development

In addition, the main function of phosphorus removal ceramsite is its high-efficiency adsorption. However, the performance of traditional phosphorus removal ceramsite is optimized from the ratio and firing process, and the phosphorus removal effect of the product is not ideal.