In the oil drilling industry, the mercury-containing Drilling waste management is essential for environmental protection. At present, various mercury removal
processes have been applied in China, mainly including chemical separation, pyrolysis, solidification and stabilization, as well as comprehensive utilization of
resources and other technical routes.
The specific methods and effects of different processes are shown in the table:
| Technology | Specific methods/Agents | Main effects/Characteristics |
Chemical separation method | Sulfide (such as sodium sulfide and sodium polysulfide), heavy metal ion scavenger, organic mercury removal agent containing sulfur and phosphorus, demulsifier/flocculant. | Mercury is separated by chemical reaction to form stable sulfide precipitation or soluble complex. Can be integrated into the processes of centrifugation, flocculation and the like. |
Pyrolysis method | Indirect heating without oxygen (pyrolysis adsorption) | Heating in an oxygen-free environment decomposes mercury-containing organic matter, and heavy metals such as mercury are fixed in the residue. After treatment, the oil content of residue is extremely low. |
Curing/stabilization | Mixed and solidified with cementing materials such as sulfur-fixing ash and cement. | Through chemical chelation (such as heavy metal ion capture agent) and physical wrapping, heavy metals such as mercury are stabilized in the solidified body for brick making or paving. |
Resource technology | Oil phase recovery, abrasive recycling and solidified body utilization. | Recover oil resources, and the treated solids (such as abrasives and solidified bodies) can be reused after meeting the requirements of environmental protection, such as paving roads and making bricks. |
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