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Method for treating arsenic in nonferrous smelting waste acid with modified red mud cooperated CuO powder

A technology of red mud and sewage acid, applied in water/sludge/sewage treatment, water/sewage treatment, chemical instruments and methods, etc., to achieve the effect of low economic cost, simple process flow and low cost

Inactive Publication Date: 2019-12-13
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method still has many deficiencies, such as many treatment problems caused by toxic sludge; using modified red mud to cooperate with CuO powder to treat sewage acid is in line with the national policy of using waste to make waste, and the concentration of As in the leachate is less than 5mg / L. The concentration of As in the solution after leaching is lower than the national "Leaking Toxicity Identification Standard for Hazardous Wastes" (GB 5085.3-2007), which is a general solid and sent for safe disposal

Method used

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  • Method for treating arsenic in nonferrous smelting waste acid with modified red mud cooperated CuO powder
  • Method for treating arsenic in nonferrous smelting waste acid with modified red mud cooperated CuO powder
  • Method for treating arsenic in nonferrous smelting waste acid with modified red mud cooperated CuO powder

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Effect test

Embodiment 1

[0025] A method for treating arsenic in colored smelting sewage acid with modified red mud and CuO powder, specifically comprising the following steps:

[0026] (1) Dry the red mud at 500°C for 6 hours and then perform ball milling. After ball milling, the particle size of the red mud is controlled below 200 mesh; the ball milling conditions are: the speed is 100r / min, and the grinding time is 10min; the composition of the red mud is shown in Table 1.

[0027] Table 1 red mud composition

[0028]

[0029] (2) Pretreat the red mud obtained in step (1) with 1.0 mol / L HCl solution for 1 hour according to the liquid-solid ratio of HCl solution to red mud (mL:g: 10:1), and then rinse with deionized water for 4 hours Once, dry at 120°C for 6 hours before use.

[0030] (3) Mix the activated red mud and CuO powder obtained in step (2) evenly according to the mass ratio of activated red mud and CuO powder of 8:1.

[0031] (4) Press H 2 o 2 With a molar ratio of 1:1 to arsenic, t...

Embodiment 2

[0039] A method for treating arsenic in colored smelting sewage acid with modified red mud and CuO powder, specifically comprising the following steps:

[0040] (1) After drying the red mud at 500°C for 6 hours, perform ball milling. After ball milling, the particle size of the red mud is controlled below 200 mesh; the ball milling conditions are: the speed is 200r / min, and the grinding time is 15min; the composition of the red mud is shown in Table 4.

[0041] Table 4 red mud composition

[0042]

[0043] (2) Pretreat the red mud obtained in step (1) with 1.0 mol / L HCl solution for 2 hours according to the liquid-solid ratio of HCl solution to red mud (mL:g: 15:1), and then rinse with deionized water for 4 hours Once, dry at 120°C for 6 hours before use.

[0044] (3) Mix the activated red mud and CuO powder obtained in step (2) evenly according to the mass ratio of activated red mud and CuO powder of 10:1.

[0045] (4) Press H 2 o 2 With a molar ratio of 1.1:1 to arsen...

Embodiment 3

[0053] A method for treating arsenic in colored smelting sewage acid with modified red mud and CuO powder, specifically comprising the following steps:

[0054] (1) After drying the red mud at 500°C for 6 hours, perform ball milling. After ball milling, the particle size of the red mud is controlled below 200 mesh; the ball milling conditions are: the rotation speed is 150r / min, and the grinding time is 13min. The composition of the red mud is shown in Table 7.

[0055] Table 7 red mud composition

[0056]

[0057] (2) Pretreat the red mud obtained in step (1) with 1.0mol / L HCl solution for 1.5h according to the ratio of the liquid-solid ratio of HCl solution to red mud (mL:g: 13:1), and then rinse with deionized water 4 times, dry at 120°C for 6 hours before use.

[0058] (3) Mix the activated red mud and CuO powder obtained in step (2) evenly at a mass ratio of activated red mud and CuO powder of 9:1;

[0059] (4) Press H 2 o 2 With a molar ratio of 1:1 to arsenic, the ...

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Abstract

The invention relates to a method for treating arsenic in nonferrous smelting waste acid with modified red mud cooperated CuO powder, and belongs to the technical field of heavy metal pollution treatment. The method comprises the following steps: drying red mud, grinding the dried red mud, and then preprocessing the ground red mud with HCl; adding H2O2 to the waste acid, performing mixing, and carrying out oxidation pretreatment at normal temperature; and adding a mixture of the HCl-activated red mud and a CuO powder into the oxidation-pretreated waste acid, stirring at normal temperature foran arsenic removal reaction, and finally carrying out solid-liquid separation. The method for removing arsenic by using the HCl-activated red mud cooperated CuO powder has the advantages of simple working process, obvious arsenic removal effect and wide prospect.

Description

technical field [0001] The invention relates to a method for treating arsenic in non-ferrous smelting sewage acid with modified red mud and CuO powder, and belongs to the technical field of heavy metal pollution control. Background technique [0002] Red mud is industrial solid waste that is discharged after refining alumina from bauxite. According to different production methods, it can be divided into sintering red mud, Bayer red mud and combined red mud (that is, the combination of sintering and Bayer) . Among them, the sintering method consumes a lot of energy per unit and has a complicated process. It is generally used to extract alumina from low-grade bauxite; the production of alumina by the Bayer method can obtain higher-quality alumina products. In 2011, the production of alumina by the sintering method only accounted for About 2.5% of the total aluminum production. my country's annual alumina output exceeds 1 million tons, and 1 to 2 tons of red mud is produced f...

Claims

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Application Information

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IPC IPC(8): C02F1/00C02F101/10C02F103/18
CPCC02F1/00C02F2101/103C02F2103/18
Inventor 祁先进卢治旭祝星王华李孔斋魏永刚胡建杭李雪竹李永奎郝烽焱
Owner KUNMING UNIV OF SCI & TECH
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