 PRODUCTS By-products
Our by-products, which includes zinc ingots, zinc carbonate and zinc sulphate
are sold
under our "UnionZinc" brand name.
| By-products |
Details |
| Zinc ingots |
Zinc ingot is refined metallic zinc in an ingot form.
Zinc is mainly used in the manufacturing of galvanizing steel used in the automobile and construction industries. Galvanizing involves coating steel with zinc to protect it against corrosion.
Other commercial uses for zinc are in manufacturing brass and zinc casting alloys. Brass (a copper-zinc alloy) takes on many desirable properties for use in electrical applications and hydraulic line fittings. Zinc casting alloys are ideal for casting small and intricate but strong parts.
Zinc is also used in alkaline and carbon-zinc batteries. A new battery technology that uses a zinc-air system has the potential to be used in the automotive industry for powering electric vehicles. |
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| Zinc carbonate |
Zinc carbonate is mainly used as raw material for the manufacturing of latex products and catalysts, in
the production of calamine, or as skin protectant. Zinc carbonate is also widely used in rubber products,
paints, medicines and other chemical industries. |
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| Zinc sulphates |
Zinc sulphates are mainly used to produce synthetic fibre, pesticides and fertilizers. |
Production Process
In the process of extracting indium slag and strip liquor, by-products such as zinc ingots, zinc sheets,
zinc carbonate and zinc sulphates are generated after further production processes. We sell these other
by-products, allowing us to enjoy the dual benefits of reduction in wastage and generation of additional
revenue for our Group.
Note:-
(1) There are 2 methods of deriving strip liquor, Strip liquor can be derived from further processing of indium slag
as shown in
the indium ingots production process, or from the method as shown herein.
Zinc ingot
Leaching: Zinc calcine ore is leached in acid solution to form zinc sulphate solution, indium slag and
leached slag. The indium slag is then used in the production of indium whilst the leached slag is used to
derive strip liquor (used in the production of indium ingot) and by-products such as zinc carbonate and
zinc sulphates.
Purifying: The zinc sulphate solution is purified with zinc dust to eliminate impurities.
Electrolysis: The purified zinc sulphate solution undergoes electrolysis in lined concrete cells for
deposition of zinc on the aluminium cathodes in a cell house. The deposited zinc is then removed and
produced into zinc sheets.
Casting: Stripped zinc sheets are melted in the melting furnaces and cast into zinc ingots.
Others
Baking: Leached slag is baked at high temperatures in the rotary kiln to produce rotary kiln powder.
Neutralising and leaching: Rotary kiln powder is mixed with zinc liquor, neutralised and leached, to
produce zinc sulphate solution.
Oxygenating and purifying: Oxidants are added to the zinc sulphate solution to oxygenate the impurities
contained within the zinc sulphate solution. Zinc dust is then added to displace these impurities and to
obtain purified zinc sulphate solution.
Zinc carbonate
The purified zinc sulphate solution is then mixed with ammonium carbonate to obtain semi-liquid zinc
carbonate. The semi-liquid zinc carbonate is dried and regrounded into fine zinc carbonate, and packed.
Zinc sulphates
The purified zinc sulphate solution is heated to vaporise the water content within. The residue is then
cooled to obtain zinc sulphate crystals. The zinc sulphate crystals are roasted and dehydrated in a
furnace to become zinc sulphate monohydrate or dried in a dryer to become zinc sulphate heptahydrate,
and packed.
Zinc By-products
Zinc By-products
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