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Method for extracting valuable heavy metals in ferrous slag by catalytic conversion of ferrous iron

A technology of catalytic conversion and ferroinite slag, which is applied in the field of hazardous waste resource treatment, can solve the problems of low extraction efficiency, small consumption of chemicals, and low energy consumption, so as to avoid secondary pollution, low processing cost, and promote waste reduction. quantified effect

Active Publication Date: 2020-11-10
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the object of the present invention is to provide a method for extracting valuable heavy metals from ferrous slag by catalytic conversion of ferrous iron. The method provided by the present invention solves the problem of low extraction efficiency of valuable metals in vitreous slag in the prior art. problem, and the consumption of medicament is small, the energy consumption is low, the treatment cost is effectively reduced, and it has high practical application value

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  • Method for extracting valuable heavy metals in ferrous slag by catalytic conversion of ferrous iron
  • Method for extracting valuable heavy metals in ferrous slag by catalytic conversion of ferrous iron
  • Method for extracting valuable heavy metals in ferrous slag by catalytic conversion of ferrous iron

Examples

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Embodiment 1

[0032] This example compares the influence of different ferrous concentrations on the release of heavy metals in the acid extraction process in the process of ferrous catalytic conversion of ferrous slag

[0033] The ferrite slag after pickling was mixed with different concentrations of Fe 2+ The solutions were mixed, and the pH of the reaction system was adjusted and controlled by adding MOPS buffer and NaOH to be 7, and the solid-liquid ratio was 20g / L, Fe 2+ The concentrations are 10mM and 30mM respectively; the oxygen in the reaction system is discharged and sealed, and the conversion reaction is carried out for 7 days, and the solid-liquid separation is carried out after the reaction; the remaining solid is adjusted to pH 3 with acetic acid to extract heavy metals, and the solid-liquid ratio is controlled to 25g / L, the reaction time is 24 hours. Carry out solid-liquid separation after reaction is complete, obtain supernatant liquid and solid jarosite slag after processi...

Embodiment 2

[0037] This example is the effect of different conversion times on the release of heavy metals in the acid extraction process in the process of ferrous ferrous catalytic conversion of ferrous slag.

[0038] Add the ferrite slag after pickling to Fe 2+ solution, and adding MOPS buffer and NaOH to adjust and control the pH of the reaction system to 7, the solid-liquid ratio is 20g / L, Fe 2+ The concentration is 10mM; that is, Fe 2+ Solution, MOPS buffer solution, NaOH solution and the reaction system formed by the ferrite slag after pickling have a pH of 7, a solid-to-liquid ratio of 20g / L, Fe 2+ The concentration of the reaction system is 10mM; then the oxygen in the reaction system is discharged and sealed, and the conversion reaction is carried out at different times (1 day, 3 days), and then the solid-liquid separation is carried out, and the remaining solid is adjusted to pH 3 with acetic acid to extract the heavy metal. The solid-to-liquid ratio was 25g / L, and the reactio...

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Abstract

The invention discloses a method for extracting valuable heavy metal from ammonium jarosite through ferrous catalytic transformation. The method includes the following steps of firstly, performing ferrous catalytic transformation, wherein the to-be-processed ammonium jarosite is mixed with a solution containing Fe2+, the pH of a reaction system is regulated by a pH regulator to be 6-8, reaction iscarried out under the anaerobic condition, and the converted solid ammonium jarosite is obtained after solid-liquid separation; and secondly, performing acid extraction, wherein the converted solid ammonium jarosite obtained in the first step is mixed with acid for reaction, and supernate and processed solid ammonium jarosite are obtained through solid-liquid separation. By means of the method, the extraction of the heavy metal in the ammonium jarosite can be greatly improved, and the effect is remarkable; and by means of the ferrous catalytic transformation method, the slag amount is low, nonew impurities are introduced, and the method has the advantages of being clean and low in energy consumption and has extremely broad application prospects.

Description

technical field [0001] The invention relates to the field of hazardous waste resource treatment, and more particularly relates to a method for extracting valuable heavy metals from ferrous slag through catalytic conversion of ferrous iron. Background technique [0002] Jarosite slag is a kind of purification slag formed in the process of zinc smelting. Its main component is jarosite formed in the iron sinking process. High content of sulfur and heavy metal ions, poor stability and other characteristics. Among them, zinc, cadmium, copper, silver, arsenic and other valuable or harmful heavy metal elements will coexist with the jarosite slag in various forms such as adsorption, embedding or mixed crystals. Due to the structure characteristics of jarosite itself, these heavy metals are easily dissolved during stockpiling or landfilling, which poses a threat to the environment. According to the "National Hazardous Waste List" published by the Ministry of Environmental Protection...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/04C22B19/20C22B19/30C22B13/00C22B15/00
CPCC22B7/006C22B7/04C22B13/045C22B15/0063C22B19/20C22B19/30Y02P10/20
Inventor 颜旭吴佳蕙曾伟志柴立元史美清魏杨金彭俊刘恢彭宁
Owner CENT SOUTH UNIV