System and method for recovering hole sealing agent and utilizing reclaimed water through single nickel salt coloring

Abstract

The invention relates to a system and a method for recovering a hole sealing agent and utilizing reclaimed water through single nickel salt coloring. The system comprises a nickel-containing wastewater collecting unit, a nickel hydroxide recovering unit, a nickel phosphate recovering unit and an N-P composite fertilizer recovering unit; the nickel-containing wastewater collecting unit comprises acolored nickel-containing wastewater collecting tank and a pump 1; the nickel hydroxide collecting unit comprises a pump 2, a pump 3, a nickel hydroxide recovering tank, a liquid ammonia tank and a 1#filter press; the nickel phosphate recovering unit comprises a nickel phosphate recovering tank, a pump 4, a phosphoric acid tank and a 2# filter press; the N-P composite fertilizer recovering unit comprises a composite fertilizer recovering tank, a pump 5 and a filter; by the classifying and recovering method and by virtue of the system configuration, water for coloring cleaning is intercepted and collected and then is recovered and converted into a hole sealing medicament, and the reclaimed water is recycled and converted into liquid N-P composite fertilizer, so that resource recycling of toxic waste is realized.

Description

technical field [0001] The invention relates to the technical field of aluminum processing, in particular to a system and method for recovering a sealing agent by coloring a single nickel salt and utilizing reclaimed water. Background technique [0002] 1. Sources of aluminum waste slag [0003] 1. Electrolytic casting aluminum ash [0004] Aluminum ash is produced in the electrolysis, smelting and casting processes of aluminum and aluminum alloys, and the total loss of aluminum due to aluminum ash is 1-12%. For every ton of raw aluminum processed, about 20-40kg of aluminum ash is produced. The amount produced is less when the molten aluminum is directly melted and cast, and the amount is more when the aluminum ingot is remelted, and about 100-250kg of aluminum ash is produced for one ton of waste aluminum recycled. Aluminum ash can be divided into two types: one is primary aluminum ash, which is the dross and skimming generated in the process of electrolysis of primary al...

AI Technical Summary

Problems solved by technology

[0008] 2.1. Extrusion mold waste liquid waste water waste residue

[0016] 2. Current status of aluminum industry waste slag treatment and utilization

At present, there are three main routes for resource utilization of aluminum ash: (1) recycle alumina and return to electrolysis, and recycle chloride salt as a melting and casting refining agent, but the main component of aluminum ash is α-Al 2 o 3 , the activity is poor, and it takes more energy to ionize it, resulting in an increase in the cell voltage

(2) Acid or alkali treatment to remove impurities, production of inorganic materials such as synthetic brown corundum, Sialon ceramics and refractory materials, production of water purification materials such as polyaluminum chloride and aluminum sulfate, and production of slagging desulfurizers for steelmaking, but due to The cost is higher than the existing ones, and industrial production cannot be realized

(3) Production of building materials or road construction materials, such as aluminate cement, calcium aluminate powder, clear water bricks, and road construction materials, etc., but the fluoride and chloride salts contained in them have an impact on performance, and the added value of the product is low, which limits practical application

This method is simple, but has the following disadvantages: first, it loses sulfuric acid, wastes aluminum ions, and the consumption of sulfuric acid reaches more than 60kg / t;

[0037] The recovery of hexavalent chromium ions is still a difficult problem, and it is currently impossible to achieve online recovery of chromium-containing agents

However, the evaporation process of trapped tri-acid produces a large amount of smoke, pollutes the environment, and costs a lot; the energy consumption of the tri-acid 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.

[0044] The traditional waste water and residue treatment methods have the following deficiencies: First, the waste residue contains aluminum hydroxide, fluoride, sulfide, nickel salt, phenol, nitrate, nitrite and other toxic and harmful substances, which is extremely harmful to the environment and cannot be landfilled. Hand over to a qualified professional company

Second, reclaimed water contains sodium ions, ammonium ions, sulfate radicals, nitrate radicals, nitrite radicals, acetate radicals, tartrate radicals, thiosulfate radicals, chloride ions, sulfur ions, fluoride ions, etc., and cannot be reused.

[0052] 3. There are problems in the treatment of waste water and residue in extrusion surface treatment

[0053] First, high water consumption, lack of mature water-saving technology, and low reuse rate of reclaimed water; second, online classification of wastewater has not become a pre-procedure, resulting in a large amount of mixed waste residue, which adds huge technical difficulties to subsequent treatment; third is The comprehensive utilization of waste slag has little effect, and waste slag treatment has become an unbearable economic burden and environmental risk for enterprises

[0054] At present, there are three prominent contradictions and problems in the treatment of waste residues: First, the state implements the management of enterprise pollutant discharge permits to control the total amount of pollutants discharged by enterprises, but the actual amount of waste water and residues of enterprises is far greater than the allowable discharge amount; second, waste residues must be It is legally transferred to a qualified third party for disposal, but the disposal capacity is obviously insufficient to legally dispose of such a huge amount of waste residue; third, waste residue is disposed of in accordance with hazardous waste regulations, the process is complicated, the efficiency is low, and the cost is high, and the aluminum processing industry will be overwhelmed

[0055] To sum up, at present, the domestic aluminum processing industry wastewater and slag treatment contradictions are prominent, comprehensive treatment is difficult, costly, and recycling rate is low, which not only causes a lot of waste of resources, but also seriously pollutes the environment.

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