System and method to treat electrolytic aluminum waste residue and co-produce quick-setting quick-hardening cement under cooperation of cement kiln

Abstract

The invention provides a system and method to treat electrolytic aluminum waste residue and co-produce quick-setting quick-hardening cement under cooperation of a cement kiln, wherein the system comprises a waste residue pretreatment system, a conversion reaction system, an alkaline metal salt extraction system and a cement kiln-based parallel production system of quick-setting quick-hardening cement, which are connected in sequence; all units in the system are hermetically connected, and a suction unit is provided to form micro negative pressure. The method comprises the steps: waste residuepretreatment; conversion reaction; extraction of alkaline metal salts and cement-kiln-based parallel production of quick-setting quick-hardening cement. The system and method herein have the advantages that electrolytic aluminum industrial waste residue can be centrally and uniformly treated at a time to eliminate its toxicity and hazard, and harmless, resourceful and final treatment of the electrolytic aluminum waste residue is achieved. The system and method are also capable of producing special quick-setting quick-hardening cement under low energy consumption and low cost, with no three wastes discharged and no secondary pollution caused.

Description

technical field [0001] The invention relates to a treatment system and method for electrolytic aluminum industrial waste residue, in particular to a system and method for co-processing electrolytic aluminum industrial waste residue and co-producing double-fast cement by using a cement kiln, and belongs to the technical field of electrolytic aluminum industrial waste residue recovery and reuse. Background technique [0002] The electrolytic aluminum industrial waste slag is the industrial waste slag generated during the electrolytic aluminum production process, including the waste slag generated from the maintenance and disposal of the aluminum electrolytic cell, that is, the slag from the overhaul of the aluminum electrolytic cell (including waste refractory brick slag, waste cathode carbon block) and the slag generated during the smelting process , salt slag and scum and other waste residues (aluminum ash). These waste residues contain HF, Cl - 、CN - Such highly toxic sub...

AI Technical Summary

Problems solved by technology

Wet treatment also produces a large amount of wastewater, especially the process of extracting fluoride salts. Due to the low solubility of fluoride salts, the amount of wastewater is huge, and there is a small amount of F in these wastewater - Ions still have the risk of polluting the environment; after extracting useful substances, there are still a large amount of solid waste, and there are still F - Such highly toxic substances are difficult to treat as general solid waste, and even if it can be done, it cannot be treated as ultimate

[0010] (2) The disposal process is cumbersome, the process is very complicated, the process cost is high, and the production cost and production energy consumption are high

The economics and sustainability of disposal technologies await further assessment

[0011] (3) In terms of using electrolytic aluminum waste slag as raw materials for cement and building materials, Na + and F - The impact on building materials products needs to be further evaluated

[0012] (4) The cathode carbon block of electrolytic aluminum industry waste residue is made of graphite material. Since most of the waste cathode carbon block is graphitized carbon, and it is also mixed with cryolite-like substances, its combustion performance is very poor, and it is difficult to burn completely under normal circumstances.

[0016] Reference document 1 provides a method for extracting lithium from electrolytic aluminum waste slag, and there will still be secondary pollution in the waste residue after extracting useful lithium; although reference document 2 and reference document 3 are both public, they can carry out electrolytic aluminum waste slag A comprehensive treatment system, but none of them can achieve the ultimate treatment of electrolytic aluminum waste slag

Images