Method for producing bivalent manganous salt
A technology of divalent manganese and manganese dioxide, applied in chemical instruments and methods, manganese halide, manganese nitrate and other directions, can solve the problems of slow reaction speed, high reaction temperature, bringing in other impurities, etc., and achieves low price and high purity. , good adaptability
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Embodiment 1
[0026] Embodiment 1: Preparation of manganese sulfate from electrolytic manganese anode slag
[0027] The composition of electrolytic manganese anode slag from an electrolytic manganese plant in Chongqing is shown in Table 1.
[0028] Table 1 Chemical composition of electrolytic manganese anode slag samples
[0029] Element
[0030] Get 200 grams of above-mentioned electrolytic manganese anode slag, pulverize to about 100 meshes of particle average size, then add 1 liter of solution containing sulfuric acid 40 g / liter (prepared with commercially available 98% concentrated sulfuric acid, containing 40g concentrated sulfuric acid in every liter), set In a constant temperature cold water bath at 15 degrees, after the temperature is stable, start stirring, add 10% hydrogen peroxide at a rate of 6 ml / min, and monitor the pH value with an electronic pH meter. During the reaction, the pH value gradually increases as the acid generates salt. , when the pH value is close to ...
Embodiment 2
[0031] Embodiment 2: Preparation of manganese chloride from electrolytic manganese anode slag
[0032] The source of electrolytic manganese anode slag is the same as in Example 1. Take 200 grams of the above-mentioned electrolytic manganese anode slag, pulverize it, put it into a stirred kettle with a volume of 1 L, and place the kettle in a constant temperature cold water bath at 25 degrees. A concentrated hydrochloric acid solution with a mass fraction of 30% was added to hydrogen peroxide with a mass fraction of 5% to form a solution with a pH of 0.7.
[0033] The solution was added to the stirred tank at a rate of 10 ml / min while stirring was started. Use an electronic pH meter to monitor the pH value. When the pH value is close to 6.0, add 30% concentrated hydrochloric acid dropwise to control the pH value to not exceed 6.0. Stop the reaction after 120 minutes, measure the manganese chloride content in the solution, and calculate the conversion rate of manganese to be 90...
Embodiment 3
[0034] Embodiment 3: remove manganese and prepare manganese nitrate from pyrolusite waste residue
[0035] The composition of pyrolusite waste residue from an electrolytic manganese plant in Hunan is shown in Table 2.
[0036] Table 2 Chemical composition of pyrolusite waste residue samples from an electrolytic manganese plant in Hunan
[0037] Element
MnO 2
SiO 2
total iron
TiO 2
CaSiO 3
other
content(%)
2.7
74.07
1.8
6.06
12.47
2.90
[0038] Take 200 grams of the above-mentioned pyrolusite waste residue, grind it to an average particle size of about 80 mesh, and then put it into a stirring kettle, and place the kettle in a constant temperature cold water bath at 5 degrees. Add 3% nitric acid solution at 5 ml / min, 3% mass content hydrogen peroxide solution at a rate of 10 ml / min, and start stirring simultaneously. Use an electronic pH meter to monitor the pH value. When the pH value is close to 6.0, slow...
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