Dehydrating agent for aluminum hydroxide and preparation method thereof

Abstract

The invention discloses a dehydrating agent for filtration in an aluminum oxide production process and a preparation method thereof. The dehydrating agent comprises the following components in percentage by weight: 7-15% of a nonionic surfactant, 2-4% of a zwitterionic surfactant, 7-15% of an anionic surfactant, 1-2% of an auxiliary agent, 0.5-2% of an organic amine salt active agent and the balance of water. The dehydrating agent disclosed by the invention is strong in dehydrating effect, green, low in foam and low in cost. The dehydrating agent can change the physical property and chemical composition of the material surface, destroy the structure formed by aluminum hydroxide and water, and effectively reduce the surface tension of water, thereby improving the dehydration performance of aluminum hydroxide. Meanwhile, due to the addition of the auxiliary agent, the surface tension of the dehydrating agent during action is effectively reduced, and the foaming capacity of the surfactant in the dehydrating process is effectively inhibited, so that the dehydrating agent has low foam.

Description

technical field [0001] The invention relates to the technical field of alumina production, in particular to a dehydrating agent for aluminum hydroxide and a preparation method thereof. Background technique [0002] In alumina production, the water content of aluminum hydroxide is a technical index that must be strictly controlled in the filtration process, and it plays an important role in stabilizing the operation of the roasting kiln. Reducing the water attached to the finished aluminum hydroxide can not only reduce the oil consumption during roasting, but also reduce the alkali consumption and improve the product quality due to the improvement of the filtrate recovery rate. With the improvement of roasting process and equipment, such as the use of fluidized roaster, more stringent requirements are put forward for the water attached to aluminum hydroxide, and effective measures are taken in production to reduce the water attached to aluminum hydroxide. [0003] The litera...

AI Technical Summary

Problems solved by technology

Since the interstitial water between the particles is the main component of the material and does not interact with the solid, it can be removed by simple concentration or using a small mechanical force, while there is a gap between other types of water and the aluminum hydroxide particles The effect of a certain "force", although it only occupies a small part in the slurry, its content is still far beyond the content of solid matter, especially capillary water, which seriously affects the moisture content of aluminum hydroxide, and a dehydrating agent is required Auxiliary separation, and separation with the help of large pressure difference negative pressure or high pressure or mechanical force field generated by external machinery

However, in the separation process, strong conveying equipment is required, resulting in a large amount of foam, which seriously affects production

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