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Treatment technology for high-arsenic acid industrial wastewater

A technology for industrial wastewater and treatment process, applied in the field of metallurgical environmental protection, can solve the problems of poor stability of arsenic precipitates, high energy consumption for crystal transformation, and increased energy consumption, and achieves the effects of good crystallization, reduced energy consumption, and reduced treatment volume.

Inactive Publication Date: 2016-04-06
昆明泉淳环保科技有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The purpose of the present invention is to overcome the disadvantages of the poor stability of the arsenic precipitate generated in the prior art or the high energy consumption and long time of crystal transformation (the heat preservation process also correspondingly increases the energy consumption), and applies ultrasonic technology to the crystal transformation process. And the precipitation process was redesigned, so that the energy consumption of the sewage acid treatment was significantly reduced, and the cleanliness of the treatment process itself was improved.

Method used

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  • Treatment technology for high-arsenic acid industrial wastewater

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Embodiment 1

[0033] Embodiment 1 A kind of industrial polluted acid, containing 3-8% of sulfuric acid, containing 20g / L of arsenic, the quantity to be treated is 360m 3 / d. First, mix the ferrous sulfate solution into the dirty acid and send it to the electrolytic cell for electro-oxidation in the cell, Fe(II) becomes Fe(III), As(III) becomes As(V), and amorphous iron arsenate precipitates in the liquid Produced, the rough separation of solid and liquid is carried out outside the tank. Place the precipitate at a frequency of 15-500kHz and an intensity of 0.3-500W / cm 2 The ultrasonic wave is irradiated at room temperature for 10-120 minutes, and the precipitation is transformed into fine crystal scorodite. Then remix the fine-crystalline scorodite and liquid phase A, add calcium sulfate slag and stir in the reaction tank, equilibrate for 0.5-8 hours, the fine crystals grow into coarse crystals, and then carry out solid-liquid separation. The co-precipitate of coarse crystalline scorodite...

Embodiment 2

[0035] A kind of industrial sewage acid, containing 80-150g / L sulfuric acid and 8g / L arsenic, the quantity to be treated is 800m 3 / d. Two systems were used, each handling 50% of the total. First, add ferric sulfate solution and hydrogen peroxide into the reaction tank A to form amorphous ferric arsenate precipitate in the dirty acid, and carry out coarse solid-liquid separation. Fully mix the precipitate with a small amount of co-precipitation of coarse crystalline scorodite and calcium sulfate (as a seed crystal), and then place it at a frequency of 15-500kHz and an intensity of 0.3-500W / cm 2 The ultrasonic wave is irradiated at 20-95°C for 10-60 minutes, and the precipitation is transformed into fine-crystalline scorodite (co-precipitate containing a small amount of coarse-crystalline scorodite and calcium sulfate). Then re-mix it with liquid phase A and add calcium sulfate slag to stir in the reaction tank, equilibrate for 0.5-8 hours, fine crystals grow into coarse cryst...

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Abstract

The invention provides a treatment technology for high-arsenic acid industrial wastewater. The technology comprises steps as follows: Step 1: an iron-containing material is added to the arsenic-containing acid industrial wastewater, and amorphous ferric arsenate sediment and a clear liquid A are formed; Step 2: the amorphous ferric arsenate sediment obtained in Step 1 is placed in a reactor with an ultrasonic wave source, and a slurry material is converted into fine-grain scorodite under the action of ultrasonic waves; Step 3: the fine-grain scorodite and the clear liquid A are led into a reaction tank and stirred to have reaction equilibrium for 0.5-8 h, and coarse-grain-scorodite-containing sediment (for harmless stockpiling) and a clear liquid B are obtained; Step 4: a neutralizer is added to the clear liquid B, the pH is adjusted to be neutral, a clear liquid C is produced (for reuse / discharge), and neutralization sludge produced in a neutralization reaction returns to Step 3 for reaction equilibrium. According to the treatment technology, an ultrasonic wave technology is applied to the grain form transformation process, a precipitation technology is designed again, contaminated acid treatment energy consumption is obviously reduced, and the self-cleanliness of the treatment process is improved.

Description

technical field [0001] The invention relates to the technical field of metallurgy and environmental protection, in particular to a process for treating high-arsenic acidic industrial wastewater. Background technique [0002] High-arsenic acidic industrial wastewater is mostly produced in the heavy metal pyrotechnic production process. For example, copper, lead, zinc, tin sulfide ore or mixed ore in the process of roasting, smelting, blowing the flue gas washing waste water (generally referred to as sewage acid in factories) belongs to high arsenic acid industrial wastewater. The acidity of the wastewater is due to the SO in the flue gas 2 and SO 3 Partially absorbed during washing, generating H 2 SO 3 and H 2 SO 4 The arsenic content is because As is usually associated with heavy metal ore in the form of sulfide, and it is used as As in smelting 2 o 3 Volatilizes into the flue gas in the form of H 3 AsO 3 form into wastewater. [0003] Sewage acid generally contai...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F103/18C02F101/10
CPCC02F9/00C02F1/66C02F1/722C02F1/52C02F1/4672C02F2103/18C02F2101/103
Inventor 刘中华阴树标
Owner 昆明泉淳环保科技有限公司
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