Method of fabricating mercury-removing reagent having layers of carbonates

A method of fabricating a mercury-removing reagent having a metal carbonates compound with a layered structure, comprising steps of:

• (a) preparing a plurality of acidic solutions of a metal M and aluminum, wherein said acidic solutions have different molar ratios of said metal M to aluminum (M:Al3+) of 1:1 to 30:1;
• and wherein the aluminum is obtained from aluminum nitrate (Al(NO3)3);
• and wherein said metal M is selected from a group consisting of manganese (Mn) and iron (Fe);
• (b) preparing an alkaline solution of sodium hydroxide (NaOH) and sodium carbonate (Na2CO3);
• (c) stirring the acidic solutions with said alkaline solution to co-precipitate metal-M/aluminum carbonates (M-Al—CO3) having said different molar ratios of M:Al3+;
• and
• (d) after being dried and processed through solid-liquid separation, forming powders of metal-M/aluminum carbonates having said different molar ratios of M:Al3+ and calcining said powders in a high-temperature furnace to obtain a mercury-removing reagent of M-Al—CO3 capable of absorbing mercury at a temperature of approximately 250 Celcius degrees (° C.) with a mercury-removing ratio greater than 90 percent under 0.1 to 10 parts per million (ppm) of mercury and has an average mercury adsorption amount of 2,000˜7,800 micrograms per gram (μg/g) at a temperature of 200° C.