Method for synthesizing aluminate powder from aluminum-containing sludge

Abstract

The invention discloses a method for synthesizing aluminate powder from aluminum-containing sludge, and belongs to the technical field of cyclic utilization of aluminum-containing sludge, wherein themethod comprises the following steps: (1) crushing or homogenizing aluminum-containing sludge, adding a sodium hydroxide solution, dissolving, and filtering to obtain an aluminate solution; (2) carrying out a reaction on the aluminate solution with a substrate A, and curing to generate high-performance aluminate powder which can be widely applied to additives, plastics, papermaking fillers, emulsion paint fillers and dispersants for ceramic production; and (3) purifying the sodium hydroxide solution after powder synthesis, and then recycling or concentrating and crystallizing for sale. Compared with a conventional technology for preparing an aluminum salt water purifying agent, the method adopts sodium hydroxide for treating sludge, most heavy metals cannot be dissolved out, sodium hydroxide consumed according to reaction characteristics is only one half to one third of acid, sodium hydroxide can be repeatedly used, a large number of resources can be saved, and meanwhile sodium hydroxide can be sold as a chemical raw material after being dissolved and purified.

Description

technical field [0001] The invention belongs to the technical field of aluminum-containing sludge recycling, and in particular relates to a method for synthesizing aluminate powder from aluminum-containing sludge. Background technique [0002] In the production process of aluminum processing enterprises, the aluminum-containing waste alkali formed in the alkali etching and stripping process and the aluminum-containing waste liquid formed in the pickling, oxidation, coloring, passivation and other processes are neutralized to form a large amount of acid-base aluminum sludge and chromium-containing waste liquid. Aluminum sludge, nickel-containing aluminum sludge and other sludge are all hazardous wastes according to the "National Hazardous Waste List (2016)". A large amount of aluminum ash is produced during the casting and recycling of aluminum profiles. In the draft for comments released in 2019, acid-base aluminum sludge was listed in the national hazardous waste catalogue,...

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Problems solved by technology

[0003] The existing measures to deal with aluminum-containing sludge mainly include landfill, preparation of aluminum sulfate water purifier, preparation of aluminum chloride water purifier, and preparation of alumina. The existing measures have the following problems: 1. Landfill cannot recycle aluminum-containing sludge 2. The preparation of aluminum sulfate water purifying agent and aluminum chloride water purifying agent needs to consume a large amount of acid, which is greatly affected by the moisture, aluminum content, and heavy metal content of aluminum-containing sludge. It is necessary to purify, dehydrate and concentrate aluminum-containing sludge, and to produce qualified water purifying agent products, which has the disadvantages of high process complexity and low economic benefits; 3. It takes a long time to prepare alumina and the yield is low. Low

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