A kind of combined treatment method of arsenic-containing acid wastewater, red mud and carbide slag

An arsenic-containing acid, combined treatment technology, used in chemical instruments and methods, solid waste removal, fertilizer mixtures, etc. The effect of removal rate

Active Publication Date: 2021-06-18
NORTHWEST RES INST OF MINING & METALLURGY INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the processing effect of each method is not satisfactory, and a large amount of research and development work is still needed to truly achieve comprehensive utilization.

Method used

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  • A kind of combined treatment method of arsenic-containing acid wastewater, red mud and carbide slag
  • A kind of combined treatment method of arsenic-containing acid wastewater, red mud and carbide slag
  • A kind of combined treatment method of arsenic-containing acid wastewater, red mud and carbide slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Step 1: In the primary reaction tank of a copper smelter, add arsenic-containing wastewater and red mud according to the weight ratio of 1:0.2, stir and leach at 20°C for 60 minutes to obtain a slurry liquid, and when the reaction is completed, the slurry liquid The mass fraction of free acid is 2.3%. Then the slurry is sent to the primary sedimentation tank for static settlement, the supernatant of the sedimentation tank is filtered by a filter press to obtain filtrate A, and the filtrate A flows into the secondary reaction tank by itself; the sediment at the bottom of the sedimentation tank is washed with water to become neutral , storage and stacking after filter press dehydration, analysis of its main component content is shown in Table 4. The sediment can be used as building material and soil conditioner after being dried naturally or in a rotary kiln.

[0030] Step 2: In the secondary reaction tank, adjust the flow rate of filtrate A to 120m³ / h, add carbide slag ...

Embodiment 2

[0033]Step 1: In the primary reaction tank of a copper smelter, add arsenic-containing wastewater and red mud according to the weight ratio of 1:0.4, stir and leach at 20°C for 90 minutes to obtain a slurry liquid, and when the reaction ends, the slurry liquid The mass fraction of free acid is 3.1%. Then the slurry is sent to the primary sedimentation tank for static settlement, the supernatant of the sedimentation tank is filtered by a filter press to obtain filtrate A, and the filtrate A flows into the secondary reaction tank by itself; the sediment at the bottom of the sedimentation tank is washed with water to become neutral , storage and stacking after filter press dehydration, analysis of its main component content is shown in Table 4. The sediment can be used as building material and soil conditioner after being dried naturally or in a rotary kiln.

[0034] Step 2: In the secondary reaction tank, adjust the flow rate of filtrate A to 100m³ / h, add carbide slag according...

Embodiment 3

[0037] Step 1: In the primary reaction tank of a copper smelter, add arsenic-containing waste water and red mud according to the weight ratio of 1:0.4, stir and leach at 20°C for 120 minutes to obtain a slurry liquid, and when the reaction is completed, the slurry liquid The mass fraction of free acid is 1.8%. Then the slurry is sent to the primary sedimentation tank for static settlement, the supernatant of the sedimentation tank is filtered by a filter press to obtain filtrate A, and the filtrate A flows into the secondary reaction tank by itself; the sediment at the bottom of the sedimentation tank is washed with water to become neutral , storage and stacking after filter press dehydration, analysis of its main component content is shown in Table 4. The sediment can be used as building material and soil conditioner after being dried naturally or in a rotary kiln.

[0038] Step 2: In the secondary reaction tank, adjust the flow rate of filtrate A to 180m³ / h, add carbide sla...

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Abstract

The invention discloses a combined treatment method of arsenic-containing acidic wastewater, red mud and carbide slag, belonging to the technical field of industrial waste treatment and comprehensive utilization. The method comprises the following steps: firstly treating the red mud with arsenic-containing acidic wastewater to remove impurity and de-alkalization of the red mud to become a harmless environment-friendly building material or soil conditioner; The obtained gypsum slag does not contain arsenic and heavy metals, which is convenient for the comprehensive utilization of gypsum slag; finally, the wastewater is jointly treated with hydrogen peroxide, gypsum slag and red mud extract, so that the arsenic and heavy metals in the wastewater can be removed and discharged up to the standard. The invention is a simple and economical waste treatment method, which realizes the harmless comprehensive utilization of arsenic-containing acid waste water, red mud and calcium carbide slag.

Description

technical field [0001] The invention belongs to the technical field of industrial waste treatment and comprehensive utilization, in particular to a combined treatment method of arsenic-containing acidic waste water, red mud and carbide slag. Background technique [0002] At present, copper smelting is mainly based on pyromelting. This process will produce a large amount of acidic wastewater containing arsenic and heavy metals. The acidic wastewater is usually treated by the lime-iron salt method and converted into standard industrial water, but it will also generate a large amount of gypsum slag containing arsenic and heavy metals. It is estimated that the annual production of 100,000 tons of copper smelting plants is supported by the gypsum-iron salt process with an annual output of about 10,000 tons of gypsum slag. It can be seen that China's copper smelting industry produces about 800,000 tons of gypsum slag sludge every year. Restricted by treatment technology and treat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/00C01F11/46C09K17/00
CPCB09B3/00C01F11/46C09K17/00
Inventor 王永斌王怡霖汪友元马进余江鸿吴斌吴克富冯治兵寇安民
Owner NORTHWEST RES INST OF MINING & METALLURGY INST
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