Recovery system and method of single nickel salt coloring and moderate temperature hole sealing agents in aluminum processing

Abstract

The invention relates to a recovery system and a method of single nickel salt coloring and moderate temperature hole sealing agents in aluminum processing. The system comprises a nickeliferous wastewater entrapment unit, a nickeliferous wastewater collection unit and a basic nickel carbonate recovery unit, wherein a running water wash trough 18# in the nickeliferous wastewater entrapment unit is externally connected with tap water; running water wash troughs 14#, 15#, 17# and 18# are in series-opposing connection; a single nickel salt coloring trough 13# is compatible with a moderate temperature hole sealing trough 16#; the nickeliferous wastewater collection unit comprises a nickeliferous wastewater collection pool A and a nickeliferous wastewater collection pool B; a pipeline connected with the nickeliferous wastewater collection pool A and the nickeliferous wastewater collection pool B is arranged at a water outlet of the running water wash trough 14#; and the basic nickel carbonaterecovery unit comprises a pump 1#, a recovery tank, a centrifuge, a secondary crystallization tank and a pump 2#. According to the system and the method, nickeliferous wastewater can be separately collected on line; a nickeliferous product, namely basic nickel carbonate, is recovered and converted into a moderate temperature hole sealing agent on a basis of agent compatibility; and reclamation and recycling of toxic waste are achieved.

Description

technical field [0001] The invention relates to the technical field of aluminum processing, in particular to a recovery system and method for single nickel salt coloring and medium-temperature hole-sealing agents in aluminum processing. Background technique [0002] Aluminum and aluminum alloys have the advantages of excellent processing performance, good corrosion resistance, beautiful surface, high recovery rate, etc., and have been widely used in construction, transportation, machinery, electric power and other industries. In recent years, the trend of expanding the application of aluminum by replacing steel with aluminum has become more obvious . The aluminum processing industry is a traditional industry, and it is a sunrise industry full of vitality. According to statistics, the per capita annual consumption of aluminum in developed countries in Europe and the United States is more than 32kg, while the per capita consumption in my country is only about 13kg, which is o...

AI Technical Summary

Problems solved by technology

[0010] 2.1. Extrusion mold waste liquid waste water waste residue

[0018] (2) Current status of treatment and utilization of waste slag in the aluminum industry

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;

[0039] The recovery of hexavalent chromium ions is still a difficult problem, and it is currently impossible to achieve online recovery of chromium-containing agents

[0043] To sum up, the traditional waste water and residue treatment methods have the following deficiencies: first, the waste water can reach the discharge standard after treatment, but the reuse rate of reclaimed water is low; Useful resources such as acid and alkali, metal aluminum, and chemicals are wasted; Fourth, the waste residue is hazardous waste, and the disposal cost is high, and environmental protection tax must be paid

[0051] 3. There are problems in the treatment of waste water and residue in extrusion surface treatment

[0052] First, high water consumption, lack of mature water-saving technology, and low water reuse rate; second, online classification of wastewater has not become a pre-procedure, resulting in a large amount of waste residue; third, the comprehensive utilization of waste residue has little effect, and waste residue treatment Become a corporate burden and environmental risk

[0053] 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 Legally transferred to a qualified third party for disposal, but the disposal capacity is obviously not enough to legally dispose of such a huge amount of waste residue; third, the waste residue is disposed of according to hazardous waste regulations, with complicated procedures, low efficiency and high cost

[0054] 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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