Preparation and regeneration method of a defluoridation material based on coal-based coke powder

Abstract

The invention discloses a preparation and regeneration method of a fluorine removing material on the basis of coal-based coke powder. The coal-based coke powder is the byproduct in the coking industry. The preparation method comprises steps of coal-based coke powder pre-oxidation and activation, preparation of precursor powder containing active fluorine-removing components, preparation and carbonization of precursor particles, and post-treatment of carbonized particles. The regeneration of the fluorine removing material comprises a step of soaking the fluorine removing material with a saturated adsorbing capacity in a caustic alkali solution and an aluminum sulfate or iron sulfate solution in sequence. The provided composite fluorine removing material can efficiently remove the fluorine in common industrial wastewater, especially the zinc sulfate electrolyte in zinc hydrometallurgy; and has the characteristics of great amount of removed fluorine, rapidness, low cost, and recyclable property.

Description

technical field [0001] The present invention relates to the resource utilization technology of coal-based coke powder, a by-product of the coking industry, and specifically relates to a method for preparing and regenerating a fluoride-removing material based on coal-based coke powder. The fluoride-removing material can efficiently remove fluorine in general industrial wastewater. Especially for the removal of fluorine in zinc sulfate electrolyte in zinc hydrometallurgy. The invention belongs to the technical field of water treatment material preparation. Background technique [0002] my country's fluorine chemical industry, iron and steel production, aluminum electrolysis and aluminum processing, acid production and sulfide-containing fertilizer production, glass product manufacturing and processing, non-ferrous metal smelting and other industries produce a large amount of fluorine-containing wastewater every year. The fluorine content in water and groundwater also seriously...

AI Technical Summary

Problems solved by technology

Although these technologies have a positive effect in reducing the fluorine content in water, there are still problems such as high treatment costs, the consumption of more resources for the preparation of defluoridation agents, the large amount of defluoridation agents, secondary pollution, and the treatment of water bodies with different pH values. There are no defects in universality and other aspects

Patents CN102259946A, CN102357357A and CN104324684A can all obtain good defluorination effect, but the raw materials containing Ti, Zr, Ce and other elements are used, resulting in high cost of these defluoridation materials, and they are only suitable for treating neutral water; patent CN1966407A published A method for removing fluorine from an acidic zinc electrolyte with aluminum salt and phosphate, but this method has resulted in a considerable loss of the valuable element zinc in the electrolyte

[0004] On the other hand, my country is a big country of coke production. Due to the small particle size of coke powder and the low content of fixed carbon in coke powder, most of them are idle except for a small part being used as thinning agent. A certain storage yard is required to place the coke powder, which leads to the occupation of a large amount of land resources, and may also pollute the environment

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