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Depolymerization method of smelting slag rich in fayalite

A technology for smelting slag and olivine, applied in the direction of improving process efficiency, etc., can solve the problem that harmful and valuable components are difficult to release, and achieve the effects of promoting development, low energy consumption, and good depolymerization effect.

Inactive Publication Date: 2020-05-15
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to its dense structure, harmful and valuable components trapped in it are difficult to be released (Perederiy, I. and V.G. Papangelakis, Why amorphous FeO-SiO2 slags do not acid-leach at high temperatures. J Hazard Mater, 2017.321:p.737-744.), the rational treatment and disposal of copper smelting slag is facing great challenges

Method used

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  • Depolymerization method of smelting slag rich in fayalite

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Embodiment 1

[0030] Embodiment 1: Depolymerization of fayalite in copper smelting slag in hot alkali system

[0031] Using the single-factor control variable method, study the dissolving of 30-75g NaOH of different quality in 150ml deionized water and place the mixed solution in a special solid waste reactor, add 15g, 30g, 45g, 60g of different particles below 50-200 mesh Depolymerization effect of copper smelting slag under the condition of diameter, stirring rate is 400rmp, different heating temperatures of 70, 90, 110, 130°C are set on the heating plate, and different time series conditions are 0.5, 1, 2, 3, 4h (Based on the leaching of silicon), determine the best experimental conditions. Under specific time series conditions, a part of the liquid is taken out with a syringe and subjected to high-speed centrifugation to achieve solid-liquid separation. The obtained depolymerization solution was diluted with 5 (v / v)% nitric acid and analyzed for metal content with an inductively couple...

Embodiment 2

[0036] The liquid-solid ratio of the depolymerized slag was 10:1, and 1.2M sulfuric acid and 0.6M hydrogen peroxide were used for enhanced leaching, and the leaching was stirred and leached for 4 hours at a stirring rate of 400rmp. After calculation, the total leaching rate of arsenic is 99.7%, the total leaching rate of lead is 1.61%, and the reduction rate is 57.1%.

Embodiment 3

[0038] The depolymerized slag was leached with a liquid-solid ratio of 10:1, 1.8M dilute hydrochloric acid and 0.6M hydrogen peroxide for enhanced leaching, and stirred and leached for 4 hours at a stirring rate of 400rmp. After calculation, the total leaching rate of arsenic is 99.7%, the total leaching rate of lead is 99.9%, and the reduction rate is 46.3%.

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Abstract

The invention belongs to the field of harmless and resource-based bulk solid waste, and particularly relates to a depolymerization method of smelting slag rich in fayalite. The depolymerization methodcomprises the following steps that (1) the smelting slag rich in the fayalite is crashed and grinded into powder, obtained smelting slag powder in a hot alkaline solution is subjected to depolymerization reaction, and the alkali solution is a sodium hydroxide solution or a potassium hydroxide solution; and (2) reaction products obtained in the step (1) are separated by solid-liquid separation toobtain a leaching solution and depolymerization slag. According to the depolymerization method of the smelting slag rich in the fayalite, hot alkali depolymerization of the fayalite in the copper smelting slag at a lower temperature is effectively achieved, and thus wrapped harmful and valuable components are exposed; and at the same time, the invention further provides an effective pre-treatmentmethod for harmless treatment and reduction recovery of the smelting slag rich in a fayalite phase.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and bulk industrial smelting slag waste harmlessness and resource utilization, and in particular relates to a method for depolymerizing smelting slag rich in fayalite. Background technique [0002] The output of smelting slag in my country in 2017 was 350 million tons. Most of these smelting slags are stored in stockpiles, which poses great environmental risks and causes a waste of resources. Typical bulk solid smelting wastes such as copper smelting slag and nickel smelting slag contain a large number of dangerous components and valuable components, so there is an urgent need for reasonable harmless and resourceful technologies. At present, the treatment methods of copper smelting slag and nickel smelting slag are mainly represented by high temperature roasting and wet pressure leaching. The existing technology mainly focuses on resource recovery (Li, S., et al., A novel process to upgrade th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/00C22B7/04C22B30/04C22B13/00C22B15/00
CPCC22B1/005C22B7/006C22B7/04C22B13/045C22B15/0089C22B30/04Y02P10/20
Inventor 朱能武张思海张建易毛扶林张宇辰
Owner SOUTH CHINA UNIV OF TECH
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