Chromium oxides and hydroxides; excluding chromium trioxide

HS v2017 Code: 281990

About chromium oxides and hydroxides; excluding chromium trioxide

HS code 281990 covers a range of chromium-based compounds, excluding chromium trioxide. These materials play a crucial role in various industrial applications, from metallurgy and chemical production to pigments and catalysts. As a key component in the manufacturing of stainless steel, chromium oxides and hydroxides are essential for the construction, automotive, and aerospace industries, contributing to the broader economic landscape.

Production process

The production of chromium oxides and hydroxides typically involves the oxidation of chromium metal or the precipitation of chromium compounds from aqueous solutions. Common methods include high-temperature roasting of chromite ore, electrochemical processes, and chemical precipitation techniques. The specific production techniques may vary depending on the desired purity, particle size, and chemical composition of the final product.

Production inputs

The primary raw material for the production of chromium oxides and hydroxides is chromite ore, which is mined and processed to extract the chromium content. Additionally, various chemical reagents, such as acids, bases, and oxidizing agents, may be required depending on the specific production process. Specialized equipment, including furnaces, reactors, and separation systems, is also necessary to ensure efficient and high-quality output.

Production outputs

The main outputs of HS code 281990 are a range of chromium-based compounds, including chromium(III) oxide, chromium(III) hydroxide, and other chromium(III) salts. These materials find applications in 810120 Chromium and articles thereof, 282490 Inorganic chemical compounds, n.e.c., and 320611 Pigments and preparations based on chromium compounds, among others. The versatility of chromium oxides and hydroxides makes them valuable inputs for various industries, contributing to the broader economic ecosystem.

Revisions to 281990

Classification codes are adjusted frequently. The code may have been revised or replaced between system versions. The table below shows the history (newest to oldest) of the code 281990. The most recent 1 version of this code (281990) is in the HS v2022 system:

This page shows a legacy version of code 281990 ( HS v2017).

Older versions

Family tree for chromium oxides and hydroxides; excluding chromium trioxide

    graph LR
    A["<a href='/classifications/hs/v2017/28'>28: Inorganic chemicals; organic and inorganic compounds of precious metals; of rare earth metals, of radio-active elements and of isotopes</a>"]
A --> B["<a href='/classifications/hs/v2017/2819'>2819: Chromium oxides and hydroxides</a>"]
B --> C["<a href='/classifications/hs/v2017/281990'>281990: Chromium oxides and hydroxides; excluding chromium trioxide</a>"]

    B --> D["<a href='/classifications/hs/v2017/281910'>281910: Chromium trioxide</a>"]

    

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