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A method for removing ammonia by washing metallurgical waste slag

A technology of metallurgical waste slag and washing liquid, applied in chemical instruments and methods, removal of solid waste, preparation/separation of ammonia, etc., can solve the problem of high energy consumption for ammonia removal from waste slag

Active Publication Date: 2021-05-07
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 washing and removing ammonia from metallurgical waste slag, so as to solve the problem of high energy consumption in waste slag removal in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Slurry 1 ton of smelting waste slag with an ammonia content of 1% in a slurry tank with water or the first-stage ammonia-containing solution to obtain a slurry with a solid content of 30%; Be that 20% milk of lime is mixed with mass concentration, under the condition that stirring speed is 300rpm, carry out stirring and mixing for the first time to carry out causticization, stir for 2h, and the terminal pH value is controlled at about 11 (left and right represent up and down fluctuations of 0.1, the same below), and obtain causticizing slurry. The causticizing slurry is subjected to primary solid-liquid separation in the primary filter press to obtain the primary ammonia-containing solution and the primary deammoniated slag; then the washing liquid is used to slurry the primary deammoniated slag in the pulping tank to obtain the primary slurry The first-stage slurry liquid is separated into the first-stage solid-liquid in the first-stage filter press to obtain the first...

Embodiment 2

[0039] The difference between Example 2 and Example 1 is that the solid content of the slurry is 15%, the ammonia content of the slag after deamination is 0.021%, and the ammonia removal rate of the smelting waste slag is 99.78%.

Embodiment 3

[0041] The difference between Example 3 and Example 1 is that the solid content of the slurry is 40%, the ammonia content of the slag after deamination is 0.041%, and the ammonia removal rate of the smelting waste slag is 97.220%.

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PUM

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Abstract

The invention provides a method for washing and removing ammonia from metallurgical waste residue. The method for washing and removing ammonia includes: step S1, slurrying metallurgical waste residue to obtain a slurry solution; step S2, using lime milk to causticize the slurry solution to obtain a slurry containing NH 3 The causticizing slurry; Step S3, solid-liquid separation is carried out to the causticizing slurry to obtain the primary ammonia-containing solution and the slag after primary deamination; and step S4, the slag after primary deamination is processed by N-level countercurrent washing, wherein Levels of countercurrent washing to obtain the corresponding ammonia-containing solution and deammoniated slag, the washing liquid of the M-1st level comes from the ammonia-containing solution of the M-level, 2≤M≤N and M is an integer, and the washing liquid of the N-th level is water . The above-mentioned countercurrent washing method for metallurgical waste slag improves economic benefits, reduces environmental pollution, and at the same time improves the overall efficiency of the deammonization washing process and the utilization rate of washing liquid. And there is no need to consume flowing air for blowing off, and the water used in washing will not be lost due to air blowing off, thus reducing water consumption.

Description

technical field [0001] The invention relates to the field of metallurgical waste slag treatment, in particular to a method for washing and removing ammonia from 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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/00C01C1/10
CPCC01C1/10B09B3/80
Inventor 孙宁磊黄松宇李明川彭建华
Owner CHINA ENFI ENGINEERING CORPORATION
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