Preparation method of manganous-manganic oxide
A technology of manganese tetroxide and manganese powder, applied in manganese oxide/manganese hydroxide and other directions, can solve the problems of slow manganese hydrolysis, influence of purity, chlorine and sulfur residues, etc., to accelerate the hydrolysis reaction, accelerate the complexation, shorten the effect of time
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[0033] Example 1: First step reaction conditions: take manganese powder with a particle size less than 50μm, ammonium lactate concentration 10g / L, temperature 40°C, stirring speed 300rpm / min, reaction for 5h, all manganese hydroxides are generated; second step Reaction conditions: at a temperature of 60℃, blow in sufficient air to oxidize, stir at 300rpm / min, and complete the reaction in 4h. After washing and drying, trimanganese tetroxide is obtained. The product index is: manganese content is 71.6%, Na 2 O0.0045%, CaO0.0025%, MgO0.0045%, S0.007%, the specific surface area measured by BET method is 25.4m 2 / g; the above-mentioned filtrate is recycled after adding 10-20% of the original ammonium lactate dosage.
Example Embodiment
[0034] Example 2: The first step reaction conditions: take manganese powder with a particle size of less than 50μm, ammonium succinate concentration, namely 20g / L, temperature 50℃, stirring speed 400rpm / min, reaction for 6h, all to generate trimanganese tetroxide precursor The second step reaction conditions: at a temperature of 50 ℃, pass in sufficient air to oxidize, the air is dispersed into small bubbles through the air flow distributor, the stirring speed is 400 rpm / min, the reaction is completed for 6 hours, and the manganese tetroxide is obtained after washing and drying , Its product index is: manganese content is 71.8%, Na 2 O0.0048%, CaO0.0035%, MgO0.0044%, S0.006%, the specific surface area measured by BET method is 26.5m 2 / g; The above-mentioned filtrate is recirculated after adding 10-20% of the amount of ammonium orthosuccinate.
Example Embodiment
[0035] Example 3: Take manganese powder with a particle size of less than 50μm, ammonium lactate concentration of 20g / L, temperature of 30℃, stirring speed of 300rpm / min, reaction for 3h, all the precursors of trimanganese tetroxide are generated; reaction conditions of the second step: at temperature At 70℃, blow in enough air to oxidize, the air is dispersed into small bubbles through the air distributor, the stirring speed is 500rpm / min, and the reaction is completed for 4.5h. After washing and drying, trimanganese tetroxide is obtained. The product index is: manganese content is 71.9%, Na 2 00.0040%, CaO0.0046%, MgO0.0033%, S0.006%, the specific surface area measured by BET method is 24.8m 2 / g; the above-mentioned filtrate is recycled after adding 10-20% of the original ammonium lactate dosage.
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