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Comprehensive utilization method of aluminum-containing waste acid

A technology for waste acid and aluminum waste, applied in separation methods, chemical instruments and methods, filtration and separation, etc., can solve unspecified problems, achieve the effect of reducing addition and production cost

Inactive Publication Date: 2020-08-07
CHANGZHOU WUJIN YOUBANG WATER PURIFICATION MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method does not provide relevant solutions for how to increase the recovery concentration of separated and recovered acid and aluminum, better realize resource utilization, and the overall reduction effect

Method used

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  • Comprehensive utilization method of aluminum-containing waste acid
  • Comprehensive utilization method of aluminum-containing waste acid
  • Comprehensive utilization method of aluminum-containing waste acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The aluminum-containing waste acid of the present embodiment is aluminum-containing waste hydrochloric acid, specifically as follows:

[0030]

[0031]

[0032] A method for comprehensive utilization of aluminum-containing waste acid, comprising the steps of:

[0033] 1) 5t of aluminum-containing waste acid is treated with 100-mesh precision filtration, and the flow rate is controlled at 1t / h. After being pumped into the filter, it enters the special separation membrane module. The special separation membrane is an acid and alkali resistant NF membrane;

[0034] 2) Slowly adjust the booster valve, slowly increase the pressure to 4Mpa, observe the liquid level gauge at the water production end rise slowly, gradually pressurize to 4.5Mpa, record the flow rate at the water production end as 550L / h, and the water production enters the reuse pool;

[0035] 3) In order to ensure that the flow rate of the produced water end is maintained at 400-500L / h, the operating pres...

Embodiment 2

[0040] The aluminum-containing waste acid of the present embodiment is aluminum-containing waste phosphoric acid, specifically as follows:

[0041]

[0042] A method for comprehensive utilization of aluminum-containing waste acid, comprising the steps of:

[0043] 1) 5t of aluminum-containing waste acid is treated with 100-mesh precision filtration, and the flow rate is controlled at 1t / h. After being pumped into the filter, it enters the special separation membrane module. The special separation membrane is an acid and alkali resistant NF membrane;

[0044] 2) Slowly adjust the booster valve, slowly increase the pressure by 2Mpa, observe the liquid level gauge at the water production end rise slowly, gradually pressurize to 3Mpa, record the flow rate at the water production end as 560L / h, and the water production enters the reuse pool;

[0045] 3) In order to ensure that the flow rate of the produced water end is maintained at 500L / h, the operating pressure is constantly a...

Embodiment 3

[0050] The aluminum-containing waste acid of the present embodiment is aluminum-containing waste sulfuric acid, specifically as follows:

[0051]

[0052] A method for comprehensive utilization of aluminum-containing waste acid, comprising the steps of:

[0053] 1) 5t of aluminum-containing waste acid is treated with 100-mesh precision filtration, and the flow rate is controlled at 1t / h. After being pumped into the filter, it enters the special separation membrane module. The special separation membrane is an acid and alkali resistant NF membrane;

[0054] 2) Slowly adjust the booster valve, slowly increase the pressure to 4Mpa, observe the liquid level gauge at the water production end rise slowly, gradually pressurize to 6Mpa, record the flow rate at the water production end as 540L / h, and the water production enters the reuse pool;

[0055] 3) In order to ensure that the flow rate of the produced water end is maintained at 500L / h, the operating pressure is constantly adjus...

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Abstract

The invention discloses a comprehensive utilization method of aluminum-containing waste acid. The method comprises the following steps: the aluminum-containing waste acid in a raw water tank is subjected to impurity removal treatment, then enters a special separation membrane system and is filtered and separated, the acid penetrates through a special separation membrane to enter a reuse water tank, aluminum is intercepted and returned to the raw water tank, circular separation is performed until the aluminum in the raw water tank is concentrated to osmotic pressure, and an acid liquor and concentrated aluminum-containing waste acid are obtained through recovery, wherein the pressure of filtering separation is 2.0-8.0 Mpa. Efficient separation of the acid and aluminum in the aluminum-containing waste acid is realized through pressurization, filtration and separation of special separation equipment; the recovery rate of the whole acid reaches over 60%, the aluminum concentration ratio isgreater than 50%, the effective reduction of the waste acid is realized, the reduction quantity is 50% or above; the acidity of recovered acid is higher than that of raw acid through pressurization,the concentration of the recovered acid is effectively increased, the concentration of the recovered acid is increased by 3% or above, the concentration of aluminum in the regenerated aluminum-containing waste acid can reach 4.8%, the acidity is 12.1%, the regenerated aluminum-containing waste acid can be used for producing an aluminum-based water purifying agent, and the production cost of the water purifying agent product is reduced.

Description

technical field [0001] The invention relates to the technical field of waste acid recovery, and more specifically, relates to a comprehensive utilization method of aluminum-containing waste acid. Background technique [0002] In the production process of aluminum products, rinsing will be carried out after polishing. In the cleaning stage, a large amount of aluminum-containing pickling waste will be generated during the cleaning process. The components of aluminum-containing waste acid generally contain hydrochloric acid, sulfuric acid, aluminum, etc. According to the "National List of Hazardous Wastes", the aluminum-containing waste liquid is a hazardous waste. For a long time, there are generally two methods for the treatment of aluminum-containing waste acid, neutralization method and waste acid regeneration method. The neutralization method uses alkaline materials such as lime and liquid caustic soda to carry out simple neutralization treatment on aluminum-containing wa...

Claims

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Application Information

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IPC IPC(8): B01D61/00B01D37/00B01D37/04C23G1/36
CPCB01D37/00B01D37/046B01D61/00C23G1/36
Inventor 李光辉王桂玉蒋银峰
Owner CHANGZHOU WUJIN YOUBANG WATER PURIFICATION MATERIALS
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