Treatment method for aluminum-containing waste sulfuric acid

A treatment method, sulfuric acid technology, applied in the direction of aluminum sulfate, aluminum sulfur compounds, sulfur trioxide/sulfuric acid, etc., can solve the problems of high indicators, limited treatment capacity, increased salt content in discharged wastewater, etc., to solve resource waste, The disposal process is energy-saving and environmentally friendly, and the production process is simple and easy to implement

Active Publication Date: 2019-03-26
CHANGZHOU WUJIN YOUBANG WATER PURIFICATION MATERIALS
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  • Application Information

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Problems solved by technology

According to literature reports, the main treatment methods for aluminum-containing waste sulfuric acid at home and abroad include neutralization method and ion exchange method. The waste acid treatment method not only wastes sulfuric acid and aluminum sulfate resources, but also increases the cost of neutralization treatment, and at the same time significantly increases the salt content in the wastewater discharged by the enterprise, which directly leads to a substantial increase in the cost of subsequent wastewater treatment
Ion exchange method is to use ion exchange resin to adsorb sulfuric acid, so as to separate aluminum ions from waste liquid, and recycle the desorbed sulfuric acid. Due to the high concentration of sulfuric acid in waste sulfuric acid, the treatment capacity of this method is very limited and cannot be applied fundamentally. actual production needs
At present, the resource utilization of aluminum-containing waste hydrochloric acid is usually to use aluminum-containing waste sulfuric acid and aluminum-containing sludge to prepare water purifying agent aluminum sulfate, but due to the uneven quality of aluminum-containing sludge, there are too high COD, total phosphorus and heavy metals. This phenomenon will easily lead to such problems in the aluminum sulfate water purifier, which will lead to the phenomenon that the indicators of the downstream water purifier manufacturers will be reversed during the sewage treatment process.
At the same time, after the aluminum-containing sludge is dissolved, part of the acid-insoluble matter produces secondary hazardous waste, which greatly increases the disposal cost of the enterprise.
Prior art CN104150517A discloses a production method for comprehensive utilization of secondary waste. In this treatment method, aluminum-containing sludge and waste sulfuric acid extracted by adding tri(octyl-decyl)alkyl tertiary amine extractant are mixed and reacted to prepare polyaluminum chloride The purpose of the extraction treatment of waste sulfuric acid is to get rid of the oil and solid impurities, rather than to extract sulfuric acid, and there is no effective treatment for the effective separation of sulfuric acid and aluminum of aluminum-containing waste sulfuric acid. method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A method for processing aluminum-containing waste sulfuric acid, comprising the steps of:

[0027] Get 200 kilograms of aluminum-containing waste sulfuric acid, its H 2 SO 4 The content is 8.3%, and the aluminum content is Al 2 o 3 Calculated as 3.8%, prepare 200 kg of organic phase (containing 45% triisooctylamine, 55% sec-octanol), and carry out continuous centrifugal extraction and separation at room temperature according to the amount of water phase: organic phase = 1:1, and the rotation speed is 220r / min, the reaction time is 3min, and the H in the primary raffinate is measured 2 SO 4 The content is 2.05%, and the secondary extraction is carried out according to the ratio of aqueous phase: organic phase = 1:1, and the H in the secondary raffinate is measured 2 SO 4 The content is 0.43%. According to the ratio of water phase: organic phase = 1:0.8, the three-stage extraction is carried out, and the H in the three-stage raffinate is measured. 2 SO 4 The cont...

Embodiment 2

[0030] A method for processing aluminum-containing waste sulfuric acid, comprising the steps of:

[0031] Get 500 kilograms of aluminum-containing waste sulfuric acid, its H 2 SO 4 The content is 12.8%, and the aluminum content is Al 2 o 3 Calculated as 2.1%. Prepare 800 kg of extractant (containing 60% triisooctylamine, 40% sec-octanol), and carry out continuous centrifugal extraction and separation at room temperature according to the amount of water phase: organic phase = 1:1.2, the speed is 280r / min, and the reaction time is 5min , the measured H in the primary raffinate 2 SO 4 The content is 3.38%, and the secondary extraction is carried out according to the ratio of aqueous phase: organic phase = 1: 1.2, and the H in the secondary raffinate is measured 2 SO 4 The content is 0.78%. According to the ratio of water phase: organic phase = 1:1, the three-stage extraction is carried out, and the H in the three-stage raffinate is measured. 2 SO 4 The content is 0.21%, ...

Embodiment 3

[0034] A treatment method for aluminum-containing waste sulfuric acid is basically the same as in Example 1, the difference being that the stripping temperature is 50°C.

[0035] Measured H in the third raffinate 2 SO 4 The content is 0.17%, and the raffinate is low-concentration aluminum sulfate, which enters the MVR concentration equipment for concentration, and concentrates it to the aluminum content with Al 2 o 3 Calculated as 6.9%, H 2 SO 4 The content is 0.33%, which can be used in the production of water purifying agent aluminum sulfate;

[0036] H 2 SO 4 H in the organic phase 2 SO 4 The content is 1.33%, and the secondary H 2 SO 4 H in the organic phase 2 SO 4 The content is 0.38%, the measured H 2 SO 4 H in the organic phase 2 SO 4 The content is 0.09%, and it can be used as a regenerated extractant and sent back to the reaction tank for recycling in the extraction section.

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Abstract

The invention discloses a treatment method for aluminum-containing waste sulfuric acid. The treatment method comprises the following steps: removing impurities from aluminum-containing waste sulfuricacid, and then adding organic phases for performing multistage extraction on sulfuric acid, and separating, thereby acquiring sulfuric acid extract liquor and raffinate containing aluminum sulfate, wherein the organic phases include an extraction agent tri-iso-octylamine and a diluent 2-octanol; the sulfuric acid extract liquor is subjected to multistage back extraction, so as to acquire a sulfuric acid solution; water is taken as a back extraction agent. The resource recycling method adopts an extraction method for separating sulfuric acid from aluminum sulfate; the separation effect is thorough; the sulfuric acid solution is served as a back extraction phase and can be reused for production; the raffinate is a low-concentration aluminum sulfate solution which can be concentrated for preparing a water purifier aluminum sulfate; H2SO4 content is below 0.25%; aluminum content is 6.5-8%, counted by Al2O3; the product quality is stable; the treatment method can be widely used for treatingvarious domestic wastewater and printing and dyeing wastewater.

Description

technical field [0001] The invention relates to the technical field of solid waste recovery, and more specifically, to a method for treating aluminum-containing waste sulfuric acid. Background technique [0002] Automobiles, home appliances, aviation, mechanical equipment, electroplating, metallurgy and other industries use a large number of aluminum and aluminum alloy castings as raw materials. These aluminum castings often need to be impregnated and rinsed with concentrated sulfuric acid before use, so a large amount of aluminum-containing waste sulfuric acid will be produced. According to literature reports, the main treatment methods for aluminum-containing waste sulfuric acid at home and abroad include neutralization method and ion exchange method. The method of treating waste acid not only wastes sulfuric acid and aluminum sulfate resources, but also increases the cost of neutralization treatment, and at the same time significantly increases the salt content in the was...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/90C01F7/74
CPCC01B17/903C01F7/748C01P2006/80
Inventor 蒋浩蒋银锋居银栋朱松锋阮殿甲朱芬
Owner CHANGZHOU WUJIN YOUBANG WATER PURIFICATION MATERIALS
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