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Method for removing multiple pollutants in copper smelting waste acid by using Bayer process red mud

A Bayer process red mud and copper removal technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problems of increasing material cost and forming iron arsenate for a long time. , to achieve the effect of reducing economic cost, reducing secondary pollution and low cost

Active Publication Date: 2018-06-08
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing arsenic removal method needs to add iron salts to the polluted acid, which increases the cost of materials, and takes too long to form iron arsenate, which can only remove arsenic in the polluted acid, and other harmful elements are also retained in the waste liquid after treatment. middle

Method used

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  • Method for removing multiple pollutants in copper smelting waste acid by using Bayer process red mud
  • Method for removing multiple pollutants in copper smelting waste acid by using Bayer process red mud

Examples

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Embodiment 1

[0036] A kind of method that this embodiment provides utilizes red mud of Bayer method to remove multiple pollutants in copper smelting sewage acid, such as figure 1 shown, including the following steps:

[0037] Step 1. Slowly add the copper smelting dirty acid solution into the heated aeration tank, continue aerating while heating, control the temperature at 82°C, and oxidize the trivalent arsenic in the dirty acid to pentavalent arsenic; the present invention adopts the method of aeration Oxidize trivalent arsenic to pentavalent arsenic to prepare for the subsequent precipitation reaction, without the use of oxidants, reducing the cost of raw materials;

[0038] Step 2, then add Bayer process red mud particles to the heated aeration tank after step 1 treatment, the Bayer process red mud selected in this embodiment contains Fe 2 o 3 :29.39wt%, CaO:11.02wt%, Na 2 0:3.16wt%, the iron-arsenic mol ratio in the regulation reaction system is about 1.0, and the pH value of react...

Embodiment 2

[0047] A kind of method that this embodiment provides utilizes red mud of Bayer method to remove multiple pollutants in copper smelting sewage acid, such as figure 1 shown, including the following steps:

[0048] Step 1. Slowly add the copper smelting dirty acid solution into the heated aeration tank, continue aeration while heating, control the temperature at 72°C, and oxidize the trivalent arsenic in the dirty acid to pentavalent arsenic; the present invention adopts the method of aeration Oxidize trivalent arsenic to pentavalent arsenic to prepare for the subsequent precipitation reaction, without the use of oxidants, reducing the cost of raw materials;

[0049] Step 2, then add Bayer process red mud particles to the heated aeration tank after step 1 treatment, the Bayer process red mud selected in this embodiment contains Fe 2 o 3 :28wt%, CaO:9wt%, Na 2 0:2wt%, adjust the iron-arsenic molar ratio in the reaction system to be about 0.85, and the pH value of the reaction ...

Embodiment 3

[0058] A kind of method that this embodiment provides utilizes red mud of Bayer method to remove multiple pollutants in copper smelting sewage acid, such as figure 1 shown, including the following steps:

[0059] Step 1. Slowly add the copper smelting dirty acid solution into the heated aeration tank, continue aerating while heating, control the temperature at 94°C, and oxidize the trivalent arsenic in the dirty acid to pentavalent arsenic; the present invention adopts the method of aeration Oxidize trivalent arsenic to pentavalent arsenic to prepare for the subsequent precipitation reaction, without the use of oxidants, reducing the cost of raw materials;

[0060] Step 2, then add Bayer process red mud particles to the heated aeration tank after step 1 treatment, the Bayer process red mud selected in this embodiment contains Fe 2 o 3 :31wt%, CaO:13wt%, Na 2 0:4wt%, adjust the iron-arsenic molar ratio in the reaction system to be about 1.18, and the pH value of the reaction...

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Abstract

The invention relates to a method for removing multiple pollutants in copper smelting waste acid by using Bayer process red mud. The method comprises the steps of oxidizing trivalent arsenic into pentavalent arsenic in the waste acid by using a way of continuously aerating while heating; then, adding Bayer process red mud particles, controlling an arsenic-iron molar ratio and a pH value, forming amorphous iron arsenate by using iron in the Bayer process red mud and arsenic in the copper smelting waste acid, and then oxidizing to form stable iron arsenate so as to remove the arsenic in the waste acid and absorb the multiple pollutants in the waste acid. After the scheme is adopted, iron salt used for treating the arsenic does not need to be additionally added, so that the economic cost is reduced; the method realizes the co-disposal of the solid waste produced by the copper smelting industry and the Bayer process red mud produced by the alumina industry, and reduces the secondary pollution to the environment. The method also can obtain iron hydroxide with an economic value by controlling the pH value while changing the Bayer process red mud waste into valuable and treating the wasteacid; due to the increment and decrement of input cost, an enterprise can obtain considerable economic benefit.

Description

technical field [0001] The invention relates to the technical fields of hydrometallurgy and environmental protection, in particular to a method for removing various pollutants in copper smelting sewage acid by using Bayer process red mud. Background technique [0002] Sewage acid is a kind of dilute sulfuric acid produced in the process of non-ferrous smelting and sulfuric acid industrial flue gas acid production. In the field of non-ferrous smelting, copper smelting sewage acid has high acidity, complex components, and rich heavy metals (arsenic, copper, zinc, lead, cadmium, etc.) etc.), and contain harmful elements such as fluorine and chlorine, they are mainly As 3+ 、Cu 2+ , Pb 2+ 、Cd 2+ 、Cr 2+ , F - , Cl - form exists. Therefore, it cannot be discharged directly, and heavy metals must be effectively removed to make the wastewater discharge meet the standard. At present, the technologies or processes of sewage acid treatment mainly include vulcanization method, li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F103/16
CPCC02F9/00C02F1/66C02F1/72C02F1/5236C02F2103/16
Inventor 黄建洪任乐辉胡学伟田森林李英杰宁平潘波
Owner KUNMING UNIV OF SCI & TECH
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