Sodium amalgam can restore the aggregation of micronized mercury. It has a strong reducing action, any metal oxide surface of the mercury (including mercuric oxide) will be reduced, thereby eliminating pathological mercury. The aforementioned sodium amalgam containing arsenic minerals particularly effective, and its role of arsenic and arsenic sodium hydroxide complexing substantially similar. When the amount added should not be too modulating mercury plate, the mercury should be capable of attaching to the appropriate marginal iron nails; nails as entirely surrounded mercury, indicating that excessive sodium amalgam, mercury additional required, otherwise it would be an alkali metal Freely mixed into mercury, causing adverse effects. If mercury is safe to adhere to the nail, add a sodium mercury paste. The appropriate ratio of sodium to mercury is about 1/2000.
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The sodium-mercury paste is prepared by cutting the sodium into extremely small squares, pressing it into the mercury with a wooden strip, and then exploding. The sodium block should not be too large and should be added gradually to prevent explosion. When it becomes viscous, it can be placed on an iron plate to form a bulk sodium mercury paste. Sodium amalgam is not easy to store and should be placed in gasoline, otherwise it will easily become a fluid.
When the treated ore containing antimony sulfide, bismuth sulfide, sodium amalgam can not be used. 
