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Method for passivating metal in electrolytic manganese residues

A technology of electrolytic manganese slag and metal, which is applied in the field of Cu, Cd, Zn, Cr, As, and Mn in passivation electrolytic manganese slag, which can solve the problem of high chemical agent cost and operating cost, unfavorable large-scale application, and cracking of solidified body And other issues

Active Publication Date: 2022-05-10
武汉大学(肇庆)资源与环境技术研究院 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods have their inherent shortcomings and limitations. For example, in cement solidification, some inhibitory salts in the waste residue will prevent its hydration process, cause the solidified body to crack, and affect the fixing effect.
In addition, when the cured body is broken in the environment, the toxic substances in the waste will re-enter the environment
In chemical stabilization, the cost and operating costs of chemical agents are high, which is not conducive to large-scale application

Method used

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  • Method for passivating metal in electrolytic manganese residues
  • Method for passivating metal in electrolytic manganese residues
  • Method for passivating metal in electrolytic manganese residues

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056]Proportion the materials by weight, electrolytic manganese slag: bagasse: waste molasses: biological passivation aid = 1:0.2:0.3:0.1 and stir evenly, then add water by spraying to keep the water content at 45%, adjust the pH value 7.8, and keep the external temperature at 31°C, and use the trough-type aerobic composting method to stack and ferment. The mass ratio of biological passivation additives is: 3% urea, 33% activated sludge, 46% urban river and lake sludge, and 18% discarded pineapple peel. During the period, the material was turned once every 2 days. During the period, distilled water was added according to the evaporation of water to keep the water content at 45%, and the fermentation period was 11 days.

[0057] After testing, the leaching amounts of Mn, Zn, As, Cd, Cr, and Cu after treatment are shown in Table 6.

[0058] Table 6

[0059]

[0060] After testing, the chemical forms of Mn, Zn, As, Cd, Cr, and Cu after treatment are shown in Table 7.

[00...

Embodiment 2

[0064] Proportion the materials by weight, electrolytic manganese slag: bagasse: waste molasses: biological passivation aid = 1:0.25:0.35:0.2 and stir evenly, then add water by spraying to keep the water content at 50%, adjust the pH value 7.7, and keep the external temperature at 33°C, and use the trough-type aerobic composting method to stack and ferment. The mass ratio of biological passivation additives is: 4% urea, 40% activated sludge, 45% urban river and lake sludge, and 11% discarded pineapple peel. During the period, the material was turned once every day, and distilled water was supplemented according to the evaporation of water during the period to keep the water content at 50%, and the fermentation period was 13 days.

[0065] After testing, the leaching amounts of Mn, Zn, As, Cd, Cr, and Cu after treatment are shown in Table 8.

[0066] Table 8

[0067]

[0068] After testing, the chemical forms of Mn, Zn, As, Cd, Cr, and Cu after treatment are shown in Table...

Embodiment 3

[0072] Proportion the materials by weight, electrolytic manganese slag: bagasse: waste molasses: biological passivation additive = 1:0.6:0.9:0.5 and stir evenly, then add water by spraying to keep the water content at 55%, adjust the pH value 8.0, and keep the external temperature at 34°C, and use the trough-type aerobic composting method to stack and ferment. The mass ratio of biological passivation additives is: 5% urea, 45% activated sludge, 42% urban river and lake sludge, and 8% discarded pineapple peel. During the period, the material was turned twice in 2 days, and distilled water was added to keep the water content at 55% according to the evaporation of water during the period, and the fermentation period was 14 days.

[0073] After testing, the leaching amounts of Mn, Zn, As, Cd, Cr, and Cu after treatment are shown in Table 10.

[0074] Table 10

[0075]

[0076] After testing, the chemical forms of Mn, Zn, As, Cd, Cr, and Cu after treatment are shown in Table 1...

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Abstract

The invention belongs to the technical field of industrial waste residue treatment, and particularly discloses a method for passivating metal in electrolytic manganese residues. The method mainly comprises the following steps: uniformly mixing electrolytic manganese residues, bagasse, waste molasses and a biological passivation aid according to a mass ratio of 1: (0.2-0.6): (0.3-0.9): (0.1-0.5), adding water by spraying, controlling the water volume to be 35-55%, adjusting the pH value to be 7.5-8.0, keeping the external temperature to be 30-35 DEG C, carrying out stacking fermentation in a trough type aerobic composting manner for 7-15 days, turning over once every 1-2 days, and carrying out fermentation for 3-5 days. During the period, distilled water is supplemented according to the water evaporation condition, so that the water content is kept at 35-55%. The method is low in treatment cost and simple in operation condition, and the treated waste residue heavy metal is low in biotoxicity and can reach the corresponding national use standard.

Description

technical field [0001] The invention relates to the technical field of metal treatment in slag, in particular to a method for passivating Mn, Zn, As, Cd, Cr and Cu in electrolytic manganese slag. Background technique [0002] Electrolytic manganese slag refers to the acid leaching waste discharged during the production process of electrolytic manganese metal. Its main components are silicon dioxide and calcium sulfate monohydrate, and there are also some harmful metal elements and As elements. The production of 1 ton of manganese metal will produce 7-9 tons of manganese slag, and as the grade of manganese ore gradually decreases, the amount of slag discharged every year is also increasing. At present, electrolytic manganese slag is generally treated by damming and open-air storage, which not only occupies precious land resources, but also heavy metal elements in the slag will enter the surrounding water bodies and soil with the erosion of rainwater and weathering, endangerin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A62D3/02A62D101/43
CPCA62D3/02A62D2101/43Y02W30/40
Inventor 侯浩波蓝际荣董祎挈向愉唯张珊珊梅涛
Owner 武汉大学(肇庆)资源与环境技术研究院