Chemical Sciences, Earth, Atmosphere & Environment Sciences


Production of Ferric Sulphate from Copper Slag for Arsenic Removal


Chemical Sciences, Earth, Atmosphere & Environment Sciences

Focus Area:

Arsenic Removal

Social Benefits:

The process does not generate any solid or liquid effluents hence the process is environmentally friendly. The technology has a great market in Copper production plants.

Developing Agency:

CSIR-National Metallurgical Laboratory (NML), Jharkhand

Technology Readiness Index:

Lab Validation

Website Link :
Source (more info) :

Brief Description

Description :

About 2.2 ton of waste copper slag is generated for every tonne of copper produced which is currently being dumped near the plant site. CSIR-NML developed a very unique process by which the slag is converted to two commercial products such as ferric/ferrous sulfate and silica powder. About 5 kL of ~35% ferric sulfate solution and ~300 kg SiO2 powder for every tone of slag treated. Ferric sulfate is an important ingredient for arsenic removal from the toxic waste stream of copper industries and silica produced from the process is useful for phosphoric acid plants. Implementation of the process will not only take care of environmental norms but also will make the industry independent of the availability of chemicals for the critical operation of treating effluents.

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