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Method for removing chlorine from metallurgical slag

A technology for removing chlorine from metallurgical slag is applied in the fields of environmental protection and comprehensive utilization of resources, which can solve the problems of low dechlorination efficiency, instability and stability, and achieve the effects of high dechlorination efficiency, low cost and good working conditions.

Inactive Publication Date: 2018-11-16
SHAANXI RUIKAI ENVIRONMENTAL PROTECTION & TECH CO LTD
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  • Claims
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Problems solved by technology

[0007] The technical problem to be solved by the present invention is that the existing dechlorination efficiency is low, unstable and stable, and a method for removing chlorine in metallurgical slag is provided to solve the above problems

Method used

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  • Method for removing chlorine from metallurgical slag
  • Method for removing chlorine from metallurgical slag
  • Method for removing chlorine from metallurgical slag

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Embodiment

[0030] Such as Figure 1-3 As shown, the present invention provides the following technical solutions: a method for removing chlorine in metallurgical slag, characterized in that it comprises the following manufacturing steps:

[0031] S1: pulping chlorine-containing metallurgical slag with water;

[0032] S2: adjusting the pH of the slurry solution;

[0033] S3: Dosing an oxidizing agent to oxidize insoluble substances such as cuprous chloride in the slag;

[0034] S4: Dosing alkali, bringing the chlorine in the slag into the solution in the form of salt, and at the same time precipitating valuable metals in the solution into the slag;

[0035] S5: performing liquid-solid separation;

[0036] S6: washing the filter residue to obtain dechlorinated metallurgical slag and salty wastewater.

[0037] In the S1 step, the liquid-solid ratio of the chlorine-containing metallurgical slag slurry is 1-8:1, the slurry of the chlorine-containing metallurgical slag is completed, and th...

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Abstract

The invention discloses a method for removing chlorine from metallurgical slag. The method comprises the following production steps: S1: carrying out slurrying on chlorine-containing metallurgical slag by utilizing water; S2, adjusting the pH (Potential of Hydrogen) of a solution subjected to the slurrying; S3: adding an oxidant; S4: adding an alkali; S5: carrying out liquid-solid separation; S6:washing filter residues. When the whole method is used, the chlorine removing efficiency is high; insoluble substances including cuprous chloride and the like in the solution subjected to the slurrying are oxidized by utilizing the oxidant and then chlorine is brought into the solution in a form of salt through alkaline substances; meanwhile, valuable metal in the solution is precipitated into theresidues and then solid-liquid separation is carried out; the separation is relatively complete; treatment sediment comprises a chlorine-containing substance and the valuable metal , and the valuablemetal can be reutilized through subsequent substitution reaction; the whole method has low energy consumption and low cost; produced chlorine-removed copper dreg is separated out.

Description

technical field [0001] The invention relates to the fields of environmental protection and resource comprehensive utilization, in particular to a method for removing chlorine from metallurgical slag. Background technique [0002] Modern metallurgical processes are mainly divided into two categories: wet method and pyrotechnic method. Taking zinc smelting as an example, zinc hydrometallurgy is the most important zinc smelting method in the world today. The main technological process of hydrometallurgy zinc smelting technology includes: roasting → leaching → purification → electrowinning → melting and casting. During the purification process of leachate, a large amount of purification slag containing valuable elements will be produced. Although these purification slags are solid wastes, they are also very valuable secondary resources. If the valuable elements are not recycled, the stacking will not only occupy a large amount of land, but also bring environmental risks and was...

Claims

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Application Information

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IPC IPC(8): C22B7/04
CPCC22B7/006C22B7/04Y02P10/20
Inventor 薛小军杨扬牛海波
Owner SHAANXI RUIKAI ENVIRONMENTAL PROTECTION & TECH CO LTD
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