Workshop system and process for producing aluminum hydroxide from mold liquid

Abstract

The invention relates to a workshop system for producing aluminum hydroxide from corrosive wash liquid. The workshop system comprises a corrosive wash liquid generating system, a corrosive wash liquidcollecting system, a corrosive wash liquid processing system and a corrosive wash liquid separating system, wherein the corrosive wash liquid generating system comprises a plurality of corrosive washtanks, a wastewater guide ditch, a water tank and a No.4 pump; the corrosive wash liquid generating system is used for processing a mould and guiding the corrosive wash liquid to the corrosive wash liquid collecting system; the corrosive wash liquid collecting system comprises a corrosive wash liquid recycling tank and a No.1 pump; the corrosive wash liquid collecting system is used for collecting the corrosive wash liquid; the corrosive wash liquid processing system comprises a reaction tank, a No.2 pump and a aluminum hydroxide seed crystal liquid storage tank; the corrosive wash liquid processing system is used for performing a chemical reaction on the corrosive wash liquid and producing aluminum hydroxide; the corrosive wash liquid separating system comprises a recycling tank and a centrifuge. The invention provides a whole set of circulating system from workshop production to recycling, wherein the system is used for recycling the aluminum hydroxide, saves water and does not scale easily.

Description

technical field The invention relates to the technical field of aluminum processing, in particular to a workshop system and process for producing aluminum hydroxide from potting liquid. Background technique 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 only about one-third of that in developed countries. There is...

AI Technical Summary

Problems solved by technology

2.1. Extrusion mold waste liquid waste water waste residue

2. Status quo 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 it to electrolysis, and recycle chloride salt as a melting and casting refining agent. However, the main component in aluminum ash is α-Al2O3, which has poor activity, and its ionization requires Consumes more energy, causing cell voltage to rise

(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, limiting 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;

The recovery of hexavalent chromium ions is still a difficult problem, and it is impossible to realize online recovery of chromium-containing agents

The traditional waste water and residue treatment methods have the following disadvantages: first, the waste water can be discharged after treatment, but the reuse rate of reclaimed water is low; second, the cost of waste water treatment is high, which increases the consumption of labor, chemicals, and power; third, a large amount of acid, alkali, and metal aluminum , chemicals and other useful resources are wasted; Fourth, the waste residue is hazardous waste, the disposal cost is high, and environmental protection tax must be paid

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

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

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; the third is to dispose of waste residue according to hazardous waste regulations, which has complicated procedures, low efficiency and high cost

To sum up, the current domestic aluminum processing industry waste water and slag treatment contradiction is prominent, comprehensive treatment is difficult, high cost, and low recycling rate, which not only causes a lot of waste of resources, but also seriously pollutes the environment

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