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Harmless and reduction method of smelting slag rich in fayalite

A technology of smelting slag and olivine, which is applied in the fields of metallurgy, reduction and recycling, and the harmless treatment of bulk industrial smelting slag waste, can solve problems such as ignoring environmental risks, and achieve the effect of reducing environmental pollution risks

Inactive Publication Date: 2020-05-22
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing technology mainly focuses on resource recycling, but ignores the environmental risks brought by these bulk solid wastes due to their harmful elements
And because copper smelting slag contains a large amount of fayalite, its rational harmless and reduction treatment and disposal are facing great challenges

Method used

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  • Harmless and reduction method of smelting slag rich in fayalite
  • Harmless and reduction method of smelting slag rich in fayalite
  • Harmless and reduction method of smelting slag rich in fayalite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Depolymerization of fayalite in copper smelting slag in hot alkali system

[0042] The copper smelting slag is crushed and sieved, the particle size of the sieved copper smelting slag is 50-250 mesh, the consumption of sodium hydroxide is 30-75g and dissolved in 150 ml of deionized water, and the lye and lye are controlled. The liquid-solid ratio in the copper smelting slag is 3:1-7:1, the stirring rate is 400rpm, and the heating temperature is set on the heating plate at 70, 90, 110, 130°C and 0.5, 1, 2, 3, 4h, etc. Depolymerization effect of copper smelting slag (in terms of silicon leaching) under different time series conditions to determine the best experimental conditions. The depolymerized slag is washed, dried and set aside.

[0043] 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)...

Embodiment 2

[0048]The depolymerized slag is extracted at a liquid-solid ratio of 10:1, and 0.4-1.4M sulfuric acid and 0.3-0.7M hydrogen peroxide are used for intensive leaching, and the leaching is stirred and leached for 4 hours at a stirring rate of 400rmp. Such as image 3 , the preferred implementation conditions in the examples are a liquid-solid ratio of 10:1, 1.2M sulfuric acid, 0.6M hydrogen peroxide, a stirring rate of 400rmp, and a reaction time of 4h. 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

[0050] The depolymerized slag was leached with a liquid-solid ratio of 10:1, 0.4-1.8M dilute hydrochloric acid and 0.6M hydrogen peroxide for enhanced leaching, and stirred and leached for 4 hours at a stirring rate of 400rmp. Such as Figure 4 , the preferred implementation conditions in the examples are a liquid-solid ratio of 10:1, 1.8M hydrochloric acid, 0.6M hydrogen peroxide, a stirring rate of 400rmp, and a reaction time of 4h. 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 technical field of harmlessness and recycling of metallurgical and bulk industrial smelting slag waste, and discloses a harmless and reduction method of smelting slag richin fayalite. The harmless and reduction method mainly adopts a hot alkali depolymerization-diluted acid enhanced leaching process, and includes the following steps that (1) the smelting slag rich infayalite is crushed and pulverized into powder, and the smelting slag is depolymerized with a hot alkaline solution to obtain depolymerized slag; and the alkaline solution is a sodium hydroxide solution or a potassium hydroxide solution; and (2) the depolymerized slag in the step (1) is subjected to agitation leaching reaction with a mixed system of diluted acid and oxidant to obtain a leaching solution and harmless and reduced slag. The test results show that the harmless and reduction method treats copper smelting slag rich in fayalite, harmful metals in the copper smelting slag are extracted, the leaching rate of the harmful metals As and Pb in the treated copper smelting slag reaches 99.7% and 99.9%, and the reduction rate of the copper smelting slag can reach 57%.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and bulk industrial smelting slag waste harmlessness, reduction and resource utilization, and specifically relates to a method for harmlessness and reduction of smelting slag rich in fayalite. Background technique [0002] Smelting slag is rich in a large amount of harmful metals and valuable elements, and has both environmental and resource attributes. Therefore, the harmlessness, reduction and resource utilization of smelting slag are very important. Because bulk industrial solid smelting waste has a large amount of dangerous components and valuable components at the same time, if it is allowed to be piled up randomly, it will not only occupy a large amount of land, but also pose a great environmental risk. Quantification and resource technology needs urgently. The existing technology mainly focuses on resource recycling, but ignores the environmental risks brought by these bulk solid wastes...

Claims

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Application Information

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IPC IPC(8): B09B3/00B09B5/00C22B7/04C22B1/00C22B30/04C22B13/00
CPCB09B3/00B09B5/00C22B7/04C22B7/007C22B1/005C22B30/04C22B13/045B09B3/80B09B2101/02Y02P10/20
Inventor 朱能武张思海黄熙贤毛扶林张建易
Owner SOUTH CHINA UNIV OF TECH
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