Treating process of water-rich aluminium hydroxide sludge

Abstract

The present invention is a treatment method for water-rich aluminium hydroxide sludge. Water-rich aluminium hydroxide sludge is rolled into sheet, and then it is frozen in a multiple-process and multiple-section belt conveyer type freezer with freezing temperature of minus 30 to minus 10 deg.C for 30-60 min; it is dewatered in a normal temperature-water thawing tank, low-vacuum filtered or squeezed to obtain wet sludge cake; and it is dried in a multiple-partition hot-carrier fluidized bed with industrial waste gas at 70-90 deg.C for 30-60 min to obtain the dry aluminium hydroxide sludge product. The present invention has the features of easy operation, low power consumption, low cost and no pollution.

Description

Technical field: [0001] The invention belongs to a treatment method for water-rich aluminum hydroxide sludge, in particular to a treatment method for water-rich aluminum hydroxide sludge using freeze-thaw and fluidized drying integration technology. Background technique: [0002] With the rapid development of aluminum smelting and aluminum processing industry, a large amount of water-rich aluminum hydroxide flocculent colloidal sludge with a water content of about 90% must be discharged during the oxidation and coloring process of aluminum profile processing, which not only wastes aluminum resources, but also Moreover, there is no suitable treatment method, which will cause more serious secondary pollution. At present, these water-rich aluminum hydroxide sludge still use two traditional treatment methods of preparing aluminum series water purifiers or digging pits for landfill. The aluminum series water purifier prepared in the first way will increase and exceed the standar...

AI Technical Summary

Problems solved by technology

The aluminum series water purifier prepared in the first way will increase and exceed the standard of aluminum content in the water during the treatment process, and excessive intake will cause brain tissue damage, hyperthyroidism, bone sclerosis, and Alzheimer's disease etc. seriously affect the health and survival of human beings, and at the same time cause fish poisoning and death; therefore, many developed countries have already made strict regulations on the aluminum content of drinking water <0.05mg / L, my country in 2000 The standard of <0.2mg / L was proposed for the first time

The second way of landfill is a potential source of aluminum pollution. Aluminum will inevitably seep into rivers or groundwater, which will inevitably cause greater pollution to the environment.