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Electrolytic ammonia removal method for metallurgical waste residues

A metallurgical waste slag and slurry technology, which is applied in metallurgical wastewater treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problem of high energy consumption of waste slag removal ammonia, and achieve the effect of reducing energy consumption

Inactive Publication Date: 2019-12-27
CHINA ENFI ENGINEERING CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to provide a method for electrolytic ammonia removal of metallurgical waste slag to solve the problem of high energy consumption of waste slag removal in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Slurry a certain smelting waste residue (containing ammonium sulfur) with water to obtain a slurry with a solid content of 30%; mix the above slurry with milk of lime with a mass concentration of 20% at 20-30°C for causticization , causticizing time 1h, the end point pH value is about 11 (left and right means fluctuating 0.1 up and down, hereinafter the same) to obtain causticizing slurry; adopt titanium cathode and noble metal-plated titanium anode to carry out electrolysis, wherein the added chloride ion concentration is 2g / L, The current density is 100A / m 2 , the electrolysis time is 2h; the ore pulp after electrolysis is filtered to obtain the filter residue; the filter residue is heated to remove ammonia, the filter residue is up to the standard stockpiling, and the filtrate is up to the standard discharge. Through the above-mentioned process, the removal rate of ammonia from the smelting waste residue is 91.3%.

Embodiment 2

[0035] The difference between Example 2 and Example 1 is that the solid content of the slurry is 5%, and the ammonia removal rate of smelting waste residue is 93.1%.

Embodiment 3

[0037]The difference between Example 3 and Example 1 is that the solid content of the slurry is 20%, and the ammonia removal rate of smelting waste residue is 92.5%.

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PUM

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Abstract

The invention provides an electrolytic ammonia removal method for metallurgical waste residues. The electrolytic ammonia removal method comprises the following steps: S1, slurrying metallurgical wasteresidues to obtain slurrying liquid; s2, causticizing the slurrying liquid by adopting an alkaline substance to obtain causticized slurry containing NH3; and S3, carrying out electrolytic ammonia removal on the causticized slurry. According to the method, firstly, the metallurgical waste residues are slurried to obtain the slurry, and the NH3-containing causticizing slurry is obtained by adding the NH3-containing alkaline substance into the causticizing slurry, such that the NH3-containing causticizing slurry can be uniformly mixed with the alkaline substance during the causticizing step so as to achieve the complete causticizing so as to obtain the NH3-containing causticizing slurry; after the causticization, the pH value of the causticized slurry is high, and all the heavy metals are basically precipitated; and then the causticized slurry is electrolyzed, so that ammonia in the causticized slurry is electrolyzed into nitrogen and volatilized, and the solid is discharged after deamination and reaches the standard. In the process, only water is consumed in the slurrying process, and besides, volatilization and consumption of water are avoided, so that the energy consumption of ammonia removal is reduced.

Description

technical field [0001] The invention relates to the field of metallurgical waste slag treatment, in particular to an electrolytic ammonia removal method for metallurgical waste slag. Background technique [0002] In recent years, with the continuous development of the metallurgical industry, a large amount of metallurgical waste slag is produced every year in the smelting process, and a large amount of waste slag is accumulated. If these waste residues are piled up for a long time, the soluble harmful substances in the residue will be dissolved out after being exposed to the sun, wind and rain, and enter the soil and flow into rivers, causing serious environmental pollution and waste of land resources. Therefore, the harmless treatment and comprehensive utilization of non-ferrous metallurgical waste residues are research hotspots in the metallurgical industry. [0003] Ammonia liquid is often used as leaching agent and precipitating agent in hydrometallurgy process, so ther...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/461C02F9/10C02F101/16C02F103/16
CPCC02F1/001C02F1/02C02F1/20C02F1/46104C02F1/46109C02F2001/46133C02F2101/16C02F2103/16
Inventor 孙宁磊刘苏宁曹敏王霄
Owner CHINA ENFI ENGINEERING CORPORATION
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