Resource recovery method of lithium iron phosphate waste materials

A lithium iron phosphate and resource recovery technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry and other directions, can solve the problems of large consumption of reagents, large amount of Fe waste residue, complicated process steps, etc., and achieve high resource recovery and utilization, The effect of short process flow and less reagent consumption

Inactive Publication Date: 2017-05-10
JINGMEN GEM NEW MATERIAL
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to provide a resource recovery method for lithium iron phosphate waste, which can solve the problems of complicated process steps, long process flow, large reagent consumption, large amount of Fe waste residue in the process, high cost and resource shortage in the prior art. The problem of low recovery

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  • Resource recovery method of lithium iron phosphate waste materials

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Experimental program
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Effect test

Embodiment 1

[0029] Step 1, roasting: take 500g of lithium iron phosphate waste and put it into a roasting furnace at 300°C for 3 hours, put it into a ball mill after cooling, mill it at 200r / min for 10min, and pass through a 100-mesh sieve to obtain sieved lithium iron phosphate waste. Standby, wherein the reaction principle is: 6LiFePO 4 +3 / 2O 2 =2Li 3 Fe 2 (PO 4 ) 3 +Fe 2 o 3 ;

[0030] Step 2, preparation of phosphoric acid solution: take 250ml of concentrated phosphoric acid with a mass fraction of 85%, dilute it to 750ml with pure water to make a phosphoric acid solution, and set aside;

[0031] Step 3, hydrothermal reaction: Take 250g of sieved lithium iron phosphate waste and 500ml of phosphoric acid solution into the hydrothermal reaction kettle, seal the lid of the kettle, set the reaction temperature program, heat to 100°C, and stir at 200r / min heat preservation reaction 1h, control the internal pressure of the reactor during the reaction process to be 0.2MPa (pay atten...

Embodiment 2

[0036] Step 1, roasting: take 500g of lithium iron phosphate waste and put it into a roaster at 400°C for 4 hours, put it into a ball mill after cooling, mill it at 500r / min for 20min, and pass through a 150-mesh sieve to obtain sieved lithium iron phosphate waste. spare;

[0037] Step 2, preparation of phosphoric acid solution: take 250ml of concentrated phosphoric acid with a mass fraction of 85%, dilute it to 1000ml with pure water to make a phosphoric acid solution, and set aside;

[0038]Step 3, hydrothermal reaction: Take 250g of sieved lithium iron phosphate waste and 1000ml of phosphoric acid solution into the hydrothermal reaction kettle, seal the lid of the kettle, set the reaction temperature program, heat to 150°C, and stir at 500r / min heat preservation reaction 2h, control the internal pressure of the reactor to 1MPa during the reaction (pay attention to venting and pressure relief during the process);

[0039] Step 4, Filtration: After the reaction is finished,...

Embodiment 3

[0044] Step 1, roasting: take 500g of lithium iron phosphate waste and put it into a roasting furnace at 500°C for 4 hours, put it into a ball mill after cooling for 30 minutes at 700r / min, and pass through a 200-mesh sieve to obtain sieved lithium iron phosphate waste. spare;

[0045] Step 2, preparation of phosphoric acid solution: take 250ml of concentrated phosphoric acid with a mass fraction of 85%, dilute it to 1250ml with pure water to make a phosphoric acid solution, and set aside;

[0046] Step 3, hydrothermal reaction: Take 250g of sieved lithium iron phosphate waste and 1250ml of phosphoric acid solution into the hydrothermal reaction kettle, seal the lid of the kettle, set the reaction temperature program, heat to 200°C, and stir at 500r / min heat preservation reaction 3h, control the internal pressure of the reactor to 1MPa during the reaction (pay attention to venting and pressure relief during the process);

[0047] Step 4, Filtration: After the reaction is fin...

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Abstract

The invention discloses a resource recovery method of lithium iron phosphate waste materials. The method concretely comprises the following steps of 1, roasting; 2, phosphoric acid solution preparation; 3, hydrothermal reaction; 4, filtering; 5, evaporation and concentration; 6, cooling and crystallization; 7, drying, and a LiH2PO4 product is obtained. The method provided by the invention has the advantages that the introduction problems of other acid, alkali and salts (H2SO4, HCl, NaOH, Na2CO3 and the like) in a conventional wet process recovery process are avoided, so that the purification of a reaction system is ensured; the P, Fe and Li resources in the waste materials can be sufficiently utilized; through conversion and synthesis between substances, the high-added-value iron phosphate and lithium dihydrogen phosphate products are prepared; no Fe waste slag is generated; all elements are efficiently utilized; the technical flow process is short; the reaction system is simple; the reagent consumption is low; the process is simple; the cost is low; the resource recovery utilization is high; the method is very suitable for industrial scaled production.

Description

technical field [0001] The invention belongs to the technical field of waste resource recovery and utilization, and relates to a resource recovery method for lithium iron phosphate waste. Background technique [0002] In recent years, with the rapid development of the new energy vehicle industry, the output of lithium-ion power batteries has exploded. Lithium iron phosphate lithium ion power battery is highly respected by electric vehicles, energy storage power stations and other industries due to its excellent safety, stability and cycle performance, low price and no pollution. With the widespread use of lithium iron phosphate power batteries, a large number of lithium iron phosphate batteries will gradually be scrapped. Especially in the past two years, the price of lithium salts has soared. How to recycle the scrapped lithium-ion batteries has become a common concern of the society. [0003] At present, there are two main types of recycling methods for waste lithium iron...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/37C01B25/30
CPCC01B25/301C01B25/375
Inventor 许开华张云河
Owner JINGMEN GEM NEW MATERIAL
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