Publication

Pickling method for aluminum

Christos Comninellis
1985
Patents

Abstract

Etched Al of uniform quality is obtained at a const. rate by pptg. Al(OH)3 from the bath with simultaneous regeneration of the NaOH or KOH. The pptn. is promoted by addn. of Na2CO3. Filterability of the ppt. is improved by the addn. of complexing agents, e.g. Na gluconate. Thus, water 12 m3 at 40-60 Deg, Na2CO3 1000, NaOH 280, and Na gluconate [527-07-1] 6 kg were placed into container, dild. to 20 m3, mixed, and heated to .apprx.70 Deg. Hot etching was done at 70-75 Deg, pH 11.7 +- 0.1, and 6.5 +- 0.5 g Al/m2-min for 1-10 min. After treatment of .apprx.5000 m2 of Al, pptn. of Al(OH)3 began. The solid content was allowed to increase to .apprx.350 kg (corresponding to the treatment of another 5000 m2 of Al), and was then kept at 250-500 kg by continuous or batchwise filtration. The filter cake was washed with water, and the filtrate and wash water were recycled. The bath was maintained by periodic addn. of water, Na2CO3 100, NaOH 50, and Na gluconate 2 kg. [on SciFinder (R)]

Official source

https://infoscience.epfl.ch/entities/publication/6f03a8b8-820d-4067-8993-1d00e568bb25

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Christos Comninellis
1985
Patents

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/6f03a8b8-820d-4067-8993-1d00e568bb25

About this result

Related concepts (32)

Filtration

Filtration is a physical separation process that separates solid matter and fluid from a mixture using a filter medium that has a complex structure through which only the fluid can pass. Solid particles that cannot pass through the filter medium are described as oversize and the fluid that passes through is called the filtrate. Oversize particles may form a filter cake on top of the filter and may also block the filter lattice, preventing the fluid phase from crossing the filter, known as blinding.

Water footprint

A water footprint shows the extent of water use in relation to consumption by people. The water footprint of an individual, community, or business is defined as the total volume of fresh water used to produce the goods and services consumed by the individual or community or produced by the business. Water use is measured in water volume consumed (evaporated) and/or polluted per unit of time. A water footprint can be calculated for any well-defined group of consumers (e.g.

Sodium hydroxide

Sodium hydroxide, also known as lye and caustic soda, is an inorganic compound with the formula . It is a white solid ionic compound consisting of sodium cations and hydroxide anions . Sodium hydroxide is a highly corrosive base and alkali that decomposes lipids and proteins at ambient temperatures and may cause severe chemical burns. It is highly soluble in water, and readily absorbs moisture and carbon dioxide from the air. It forms a series of hydrates . The monohydrate crystallizes from water solutions between 12.

Related publications (32)

Pickling method for aluminum

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