Other wastes

Sulphur waste

Sulphur waste is produced in large quantities during mining, metal ore processing and other industrial processes. Often the high sulphur content of the waste makes disposal or extraction of remaining valuable metals (e.g. silver, lead) impossible. VacuDry® technology allows for the separation of water and sulphur from the waste, allowing metal ores or minerals with drastically reduced sulphur content to be extracted.

Benefits of VacuDry® sulphur waste treatment plants:

  • Recovery of valuable metal ores and sulphur
  • Environmentally friendly, fully enclosed separation process
  • Oxygen-free process for the highest level of safety and product quality
  • High temperatures and low vacuum pressure ensure a thorough cleaning process
  • Low energy consumption through efficient heat transfer
  • Emission and dust-free system; encapsulated treatment of exhaust vapours and solids
  • Optional stabilisation/solidification/briquetting of cleaned solids after thermal treatment
  • High flexibility regarding differing types of input waste streams
Key Facts

Sources:

Metal production by leaching process (e.g. zinc production), chemical processes, mining

Input material:

Solids and sludge with varying viscosities: liquid, semi-solid, solid
Up to 60 % elemental sulphur

Output material:

 < 1 % elemental Sulphur (possible) Minerals and metal ores for further processing

Plant design:

Fixed or mobile execution 0.5 … > 10 t/h throughput capacity

Heating system fired by:

Electricity, biofuels, hydrogen, recovered oil, diesel, natural gas, as well as hybrid systems are available

Optional:

Remoistening, cooling, briquetting and stabilisation of cleaned solid output

Calcium fluoride CaF2

CaF2 is commonly used both in the production of both aluminium and steel, where it is used as a flux to lower the melting point and aid in the removal of impurities. From these processes, CaF2 is recovered as filter cake. Until now this filter cake had to be disposed as waste. The VacuDry® technology is able to remove the chemically-bound water from the filter cake, making it possible to reuse the remaining CaF2 in production.

Benefits of VacuDry® calcium fluoride CaF2 treatment plants:

  • Recovery of valuable CaF2
  • Environmentally friendly, fully enclosed separation process
  • Oxygen-free process results in a high level of safety and product quality
  • Low energy consumption is achieved through efficient heat transfer
  • Emission and dust-free system; encapsulated treatment of exhaust vapours and solids
  • Optional pelletizing of dried solids after thermal treatment
  • High flexibility regarding differing types of input waste streams
Key Facts

Sources:

Steel and aluminium production

Input Material:

Filter cake

Output material:

Dry CaF2; Water content below 0.2 %

Plant design:

Fixed or mobile execution, 0.5 … > 10 t/h throughput capacity

Heating system fired by:

Electricity, biofuels, hydrogen, recovered oil, diesel, natural gas, as well as hybrid systems are available

Optional:

Pelletizing of dry CaF2