Method for preparing high-density lithium iron phosphate from siderite
A technology of lithium iron phosphate and siderite, which is applied in the field of electrochemistry, can solve the problems of high risk factor, difficult operation, impurity elements, and long process, so as to save energy-consuming steps, improve electrical conductivity, and reduce costs. Effect
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Embodiment 1
[0035] Embodiment one is example with the siderite that contains 1mol iron carbonate, the concentration of phosphoric acid is 0.2mol / L, and the concentration of hydrogen peroxide is 10wt%, and concrete preparation method is:
[0036] Step 1: Dissolving Siderite
[0037] According to the molar ratio of iron and pure phosphoric acid is 2:7, directly add H 3 PO is calculated as 3.5 mol of phosphoric acid. At this time, the reaction temperature is 40°C, and the reaction time is 5 hours. After fully reacting, an iron solution is obtained;
[0038] The second step: the iron solution is mixed with P(DMDAAC-AM)
[0039] Add the iron solution obtained in the first step into the P(DMDAAC-AM) solution and stir well to make the two mix evenly. The mass ratio of siderite to P(DMDAAC-AM) is required to be 10:1;
[0040] The third step: the iron solution reacts with hydrogen peroxide
[0041] According to the molar ratio of iron to pure hydrogen peroxide is 2:1, add H 2 o 2 Calculated a...
Embodiment 2
[0046] Embodiment two is example with 1mol siderite (in iron carbonate), the concentration of phosphoric acid is 0.3mol / L, and the concentration of hydrogen peroxide is 20wt%, and concrete preparation method is:
[0047] Step 1: Dissolving siderite.
[0048] According to the molar ratio of iron to pure phosphoric acid is 2:4, directly add H 3 PO is calculated as 2 mol of phosphoric acid, and the concentration of phosphoric acid is 0.3 mol / L. At this time, the reaction temperature is 70°C, and the reaction time is 3 hours. After fully reacting, an iron solution is obtained;
[0049] The second step: the iron solution is mixed with P(DMDAAC-AM)
[0050] Add the iron solution obtained in the first step into the P(DMDAAC-AM) solution and stir well to make the two evenly mixed. The mass ratio of siderite to P(DMDAAC-AM) is required to be 20:1.
[0051] The third step: the iron solution reacts with hydrogen peroxide.
[0052] According to the molar ratio of iron to pure hydrogen ...
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