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Method for preparing trimanganese tetraoxide with hydroquinone by-product manganese water
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A technology of manganese tetroxide and hydroquinone, applied in the direction of manganese oxide/manganese hydroxide, etc., to achieve the effects of low environmental protection pressure, wide source and low cost
Active Publication Date: 2015-08-19
CHONGQING SHANGJIA ELECTRONICS
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Problems solved by technology
It has not been used to prepare trimanganese tetraoxide for soft ferrozinc manganese
Method used
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Embodiment 1
[0022] 1. Measure 3.0L of manganese-containing water (this water contains 47g / l of manganese and 40g / l of sulfuric acid), pour it into a 5L beaker, stir and add 5g / l of ferrous sulfate with a mass concentration of iron of 16%, add 4 g / l of hydrogen peroxide with a mass concentration of 27% was reacted for 1 hour at a temperature of 40-50° C. and a pH of 2.5-3.
[0023] Stirring and adding ammoniacal liquor 123g (ammonia liquor mass concentration is 17%) in above-mentioned reaction solution is neutralized to pH is 5.2, then adds the flocculant PAM that concentration is 0.3%, the add-on of PAM is 1g / l, then first quick stirring, makes Mix the flocculant with the solution evenly, then stir slowly to flocculate and precipitate, and filter to obtain 3.12 L of filtrate, which contains 45 g / l of manganese.
[0024] 2. Co-precipitation: Measure 3L of manganese-containing purification solution, pour it into a 5L beaker, calculate the amount of ammonium bicarbonate added according to th...
Embodiment 2
[0029] 1. Measure 80M of manganese acid water 3 (containing manganese 47g / l, containing sulfuric acid 40g / l), pumped into 100M 3 In the reaction kettle, stir and add ferrous sulfate 5g / l with a mass concentration of iron of 16%, add 4g / l of hydrogen peroxide with a mass concentration of 27%, and react at a temperature of 40-50°C and a pH of 2.5-3. 1 hour.
[0030] Stir and add ammonia water (3.27T ammonia water mass concentration is 17%) in above-mentioned reaction solution and neutralize until pH is 5.0-5.5, then add the flocculant PAM that concentration is 0.3%, the addition of PAM is 1g / l, then first quick stirring , so that the flocculant and the solution are mixed evenly, then slowly stirred to flocculate and precipitate, and filtered to obtain the filtrate 80M 3 , This liquid contains manganese 43.5g / l.
[0031] 2. Co-precipitation: Measure 65M of manganese-containing purification solution 3 , pour 100M 3 In the reactor, calculate the amount of ammonium bicarbonate ...
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Abstract
The invention discloses a method for preparing manganese oxide through hydroquinone by-product manganese water. The method includes the following steps that first, ferrous sulphate and hydrogen peroxide are added in the hydroquinone by-product manganese water, and the mixture is stirred for reaction; the pH is adjusted by adding ammonia water; flocculant is added for precipitation, and finally, filtering is performed; second, ammonium bicarbonate is added for coprecipitation, the amount of the added ammonium bicarbonate is smaller than a theoretical calculated amount, then, filtering is performed, and coprecipitation powder is obtained through washing; third, coprecipitation powder is suspended through gas, fast calcined at low temperature and decomposed so that rough manganese oxide can be obtained, then, the calcined rough manganese oxide is added into organic acid, filtering is performed, a filter cake is washed with water so that rough manganese oxide can be obtained, and the rough manganese oxide is ground so that products can be obtained. According to the method, the hydroquinone by-product manganese water with raw materials easy to obtain is used, cost is low, the source range is wide, and waste is utilized with high value. Besides, magnesium and calcium in a solution do not need to be removed through fluoride, use of harmful fluoride is avoided, and environmental-protection pressure is small.
Description
technical field [0001] The invention relates to a method for preparing manganese tetraoxide, in particular to a method for preparing manganese tetraoxide by using manganese water, a by-product of hydroquinone. Background technique [0002] At present, manganese tetraoxide, which is used to prepare soft magnetic manganese zinc ferrite, is usually prepared by using manganese sulfate solution, removing calcium and magnesium with fluoride, co-precipitating, and calcining at high temperature for a long time. On the one hand, due to the long calcination time at high temperature, the performance of manganese manganese tetraoxide is affected. On the other hand, such a process needs to add fluoride to remove calcium and magnesium, which is costly and seriously pollutes the environment. [0003] For example, Chinese patent 2009101090381 discloses a method for preparing manganese tetraoxide from a manganese sulfate solution. Firstly, solid fluoride is added to remove calcium, magnesium...
Claims
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