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Method of recovering compound fertilizer from polishing cleaning wastewater in aluminum industry and system configuration

A technology for cleaning waste water and system configuration, which is applied in the field of aluminum processing, can solve the problems of high energy consumption, high treatment cost, and high cost in the three-acid evaporation process, and achieve saving energy consumption and environmental protection costs, reducing the amount of waste liquid recovery, Effect of low cost of waste liquid treatment

Active Publication Date: 2019-01-11
FOSHAN SANSHUI XIONGYING INNOVATION CENT FOR ALUMINUM SURFACE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the evaporation process of trapped triacids produces a large amount of smoke, pollutes the environment, and costs a lot; the energy consumption of the triacidic evaporation process is huge, and the cost cannot be underestimated; the evaporation container corrodes too quickly and needs to be replaced every two years, which requires too much investment
In the actual operation of tri-acid recovery, there are problems such as large pollution, high energy consumption, low efficiency, and high cost.
This treatment method has high costs, a large amount of waste residue, and ammonia nitrogen emissions.
[0015] In modern aluminum processing enterprises, there is an urgent need to deal with polishing waste liquid, but the traditional method of mixing large amounts of cleaning water and then processing it is too simple, resulting in a large amount of phosphorus and nickel-containing waste residues, and the society pays expensive environmental protection costs for these waste residues. Urgently develop new technology to solve environmental protection problems of polishing waste acid

Method used

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  • Method of recovering compound fertilizer from polishing cleaning wastewater in aluminum industry and system configuration
  • Method of recovering compound fertilizer from polishing cleaning wastewater in aluminum industry and system configuration
  • Method of recovering compound fertilizer from polishing cleaning wastewater in aluminum industry and system configuration

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0147] Embodiment 1 Recycling of aluminum phosphate and liquid N-P compound fertilizer.

[0148] Polishing waste water interception: aluminum alloy enters polishing tank 1 and polishes for 20s-120s, then trickles for 20s; aluminum alloy enters first non-flowing washing tank 2, cleans for 60s, drips for 30s, first flowing washing tank 2 is provided with cooling pipe 8, The production temperature of the first flowing water washing tank 2 is controlled at ≤ 50°C; after that, the aluminum alloy enters the second non-flowing water washing tank 3, cleans for 60 seconds, and drips for 30 seconds; then enters the high-pressure atomizing spray tank 4 and sprays for 30 seconds. s, the spray water flows into the storage tank 5; the interception of the polishing liquid waste water is completed; when the water level in the first flowing water washing tank 2 drops, it is supplemented by the water in the second non-flowing water washing tank 3; when the second non-flowing water washing tank 3...

Embodiment 2

[0152] Example 2 Liquid N-P compound fertilizer concentrates the crystallization separation liquid to generate N-P compound fertilizer.

[0153] Get embodiment 1 when the bath liquid density of the first non-flowing washing tank reaches 1.29-1.31g / cm 3 When collecting the bath liquid and stopping the dosing when the pH value reached 6.5-7.5, 1000g of liquid N-P compound fertilizer was obtained. Concentrate and crystallize, dry and grind to obtain 453g of N-P compound fertilizer containing ammonium sulfate-ammonium phosphate-ammonium nitrate. The solid content of the liquid N-P compound fertilizer is 45.3%, and the water content is 54.7%.

Embodiment 3

[0154] Example 3 Liquid N-P compound fertilizer is mixed with bagasse (moisture content ≤ 10%) to produce granular organic-inorganic compound fertilizer.

[0155] Get embodiment 1 when the bath liquid density of the first non-flowing washing tank reaches 1.29-1.31g / cm 3 When collecting bath liquor and when the pH value reaches 6.5-7.5 and stops dosing, the obtained water content is 54.7% liquid N-P compound fertilizer 1000g, add dry and fresh distiller's grains 10g, gradually add dry powdery bagasse (moisture content ≤10%), until no water dripping, the dosage of bagasse (moisture content≤10%) is 250g, and the finished product is granular organic-inorganic compound fertilizer; in the retting factory area equipped with ventilation equipment, ferment for 60 days, and the compound fertilizer becomes black Black is the end point of ripening;

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Abstract

The invention discloses a method of recovering a compound fertilizer from polishing cleaning wastewater in aluminum industry and system configuration. A high pressure atomizing spray tank, a second immobile washing tank and a first immobile washing tank successively communicate. The high pressure atomizing spray tank is connected to a storage tank for storing spraying wastewater, and the high pressure atomizing spray tank communicates to the second immobile washing tank; an aluminium phosphate recovery system comprises a reaction tank, a #5 pump, a liquid ammonia tank and a filter press, the reaction tank communicates to a #1 pump, and an N-P compound fertilizer recovery system comprises a recovery tank, a #7 pump and a filter communicate successively. The invention also discloses a methodof recovering the compound fertilizer from a polishing solution. By adopting the washing tank to intercept the polishing solution for centralized treatment, the trouble of treating the massive wastewater mixed with other water is avoided, the environment-friendly cost of treating phosphorus and ammonia-nitrogen containing wastewater is lowered greatly, and discharge of nickel-containing solid hazardous wastes is reduced greatly. By adopting the high pressure atomizing spray tank, the recovery amount of the waste liquor is reduced.

Description

technical field [0001] The invention relates to the technical field of aluminum material processing, in particular to a method and system configuration for recycling compound fertilizer from polishing and cleaning wastewater in the aluminum industry. Background technique [0002] Aluminum alloy has the advantages of excellent processing performance, good corrosion resistance, beautiful surface, high recovery rate, etc., and has been widely used in construction, transportation, machinery, electric power and other industries. In recent years, the trend of aluminum replacing copper, aluminum replacing wood, aluminum replacing steel, and expanding the scope of aluminum application has become more obvious. The aluminum processing industry is not only a traditional industry, but also a sunrise industry full of vitality. According to statistics, the per capita annual consumption of aluminum alloy in developed countries in Europe and the United States is more than 32kg, while the p...

Claims

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Application Information

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IPC IPC(8): C01B25/36C01B25/37C05G1/06C05G1/00
CPCC01B25/36C01B25/37C05B7/00C05C1/00C05C3/00C05F5/008C05F11/00C05F5/002
Inventor 熊映明
Owner FOSHAN SANSHUI XIONGYING INNOVATION CENT FOR ALUMINUM SURFACE TECH
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