Pretreating agent for fluorine-containing solid waste slag and preparing and using method thereof

Abstract

The invention relates to a pretreating agent for fluorine-containing solid waste slag. The pretreating agent is prepared from, by weight, 10-50 parts of calcium compound and 5-10 parts of curing agent. The calcium compound is added into the fluorine-containing solid waste slag, and composition fluorine ions in the fluorine-containing solid waste slag and calcium ions added into the calcium compound are used for forming a calcium fluoride compound which is difficult to dissolve in water, so that the number of free fluorine ions in the fluorine-containing solid waste slag is greatly reduced, and the phenomenon that the content of the fluorine ions in the fluorine-containing solid waste slag is high in the prior art, and thus the fluorine ions can be dissolved in soil and underground water to cause pollution easily is avoided. The curing agent is added into the fluorine-containing solid waste slag, and thus the effect of bonding the fluorine-containing solid waste slag is achieved. Meanwhile, a layer of low-permeable matter is formed on the surface of the fluorine-containing solid waste slag, so that transfer of harmful components which mainly refer to the fluorine ions in the fluorine-containing solid waste slag is limited, and pollution of the soil and the underground water is avoided as well.

Description

technical field [0001] The invention belongs to the field of solid waste pretreatment, and in particular relates to a pretreatment agent for fluorine-containing solid waste residue and a preparation and use method. Background technique [0002] In industrial production, especially metallurgical industrial production and various mining production, various fluorine-containing solid / liquid hazardous wastes are inevitably produced while producing various products. How to deal with the environmental protection of these various fluorine-containing solid / liquid hazardous wastes whose fluorine content seriously exceeds the standard is the top priority of the enterprise. [0003] For example, in the production process of electrolytic aluminum plants, it is inevitable to produce a large amount of solid waste residue, especially in the process of overhaul, a large amount of waste residues such as spent cathodes and anode carbon blocks containing fluorine will be generated. According t...

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Problems solved by technology

[0005] For this reason, the technical problem to be solved by the present invention lies in the problem that the fluorine-containing solid waste residue in the prior art is treated with a pretreatment agent before landfill, and the fluoride ion content is high and the unit treatment cost is expensive. Pretreatment agent and its preparation method and use method