Name | iron(II) oxalate |
Synonyms | ferrox[qr] Ferrous Oxalate iron(II) oxalate iron(2+)oxalate[qr] iron(ii)oxalate[qr] ironoxalate[fec2o4][qr] OXALIC ACID IRON (II) SALT |
CAS | 516-03-0 |
EINECS | 208-217-4 |
InChI | InChI=1/C2H2O4.Fe/c3-1(4)2(5)6;/h(H,3,4)(H,5,6);/q;+2/p-2 |
Molecular Formula | C2FeO4 |
Molar Mass | 143.86 |
Density | 2.30 |
Melting Point | 190°C |
Water Solubility | Slightly soluble |
Solubility | Soluble in acids |
Vapor Presure | 0.038Pa at 25℃ |
Appearance | Powder |
Exposure Limit | ACGIH: TWA 1 mg/m3NIOSH: TWA 1 mg/m3 |
Storage Condition | Inert atmosphere,Room Temperature |
Sensitive | Hygroscopic |
Physical and Chemical Properties | Ferrous oxalate was stable at room temperature and atmospheric pressure, exhibited light yellow crystalline powder with slight irritation. The decomposition of ferrous oxalate by heating into ferrous oxide, carbon monoxide and carbon dioxide is used as a photographic developer and is used in the pharmaceutical industry. |
UN IDs | UN3288 |
TSCA | Yes |
Hazard Class | 6.1 |
Packing Group | III |
LogP | -0.855 |
EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
introduction | ferrous oxalate, also known as ferrous oxalate, battery grade ferrous oxalate can be used as the raw material of lithium iron phosphate as the cathode material of batteries, and is one of the main substances of lithium iron phosphate as the cathode active material of lithium ion batteries. Its purity and particle size are crucial to the performance of lithium iron phosphate. |
use | ferrous oxalate is a widely used chemical raw material, which can be used for colorants such as dyes, coatings, ceramics, glassware, etc., and the production of new photosensitive materials. it is also the main raw material required for the synthesis of nano magnetic materials, porous materials for supercapacitors and lithium iron phosphate cathode materials for lithium ion batteries. |
synthesis method | 1) room temperature aging method. Weigh a certain amount of oxalic acid and ammonium ferric sulfate, dissolve with water, stir with a magnetic stirrer at room temperature for 30min, age for 3h, after the reaction is complete, wash with distilled water and anhydrous ethanol for several times, carry out solid-liquid separation, dry at 60 ℃ for 12 h, and obtain light yellow ferrous oxalate product. 2) Water bath heating method. Weigh a certain amount of oxalic acid and ammonium ferric sulfate, divide it into 4 parts, respectively add water, ethylene glycol (EG) and water with a volume ratio of 3:1, EG and water with a volume ratio of 1:1, and use a heat collection type constant temperature heating magnetic stirrer under the condition of 90 ℃, stir for 3 hours, wait for the reaction to be complete, wash with distilled water and anhydrous ethanol for multiple times, and carry out solid-liquid separation, dry at 60 ℃ for 12h to obtain light yellow ferrous oxalate product. 3) Streaming disguised method. Weigh a certain amount of oxalic acid and ammonium ferric sulfate, divide them into two parts, place them in a mortar respectively, add a small amount of water in one part, add a small amount of EG in one part, grind for 30 min at room temperature, then take out the product, wash it with distilled water and anhydrous ethanol for many times, carry out solid-liquid separation, and dry it in an oven at 60 ℃ for 12 h to obtain light yellow ferrous oxalate product. 4) Solvothermal method. Weigh a certain amount of oxalic acid and ammonium ferric sulfate, divide them into 3 groups with 4 parts in each group, add water, EG and water with a volume ratio of 3: 1, EG and water with a volume ratio of 1: 1, stir with a magnetic stirrer at room temperature for 30 min, then put them into a reaction kettle, and react in an oven at 120 ℃, 150 ℃ and 180 ℃ for 3 h respectively, after the reaction is complete, take it out, wash it with distilled water and absolute ethanol for many times, carry out solid-liquid separation, and dry it in an oven at 60 ℃ for 12 h to obtain light yellow ferrous oxalate product. |
preparation | (1) pretreatment of raw material ferrous sulfate put raw material ferrous sulfate into stainless steel washing kettle, fully wash and filter with deionized water, recover iron powder, and move ferrous sulfate to enamel dissolution kettle; The ferrous sulfate in the enamel dissolution kettle is fully dissolved with deionized water, and then pure iron powder, inhibitor and impurity precipitant are added, adjust the pH value of the solution to 1-4, fully stir and let it stand until the solution is clarified, transfer the upper layer of ferrous sulfate clarified liquid into an enamel synthesis kettle for later use, the amount of iron powder is 1%-2% of the mass of ferrous sulfate, the amount of inhibitor is 0.5%-5% of the mass of ferrous sulfate, the amount of impurity precipitant is 1%-10% of the mass of ferrous sulfate;(2) Synthesis of nano-scale ferrous oxalate Add 100% ~ 300% deionized water of the quality of the precipitant to the precipitant, stir and gradually raise the temperature to 70~90 ℃ for later use; add the thickener to the clarified solution of ferrous sulfate, stir and gradually raise the temperature to 70~90 ℃, the amount of thickener is 20% ~ 40% of the quality of ferrous sulfate; add the precipitant solution to the enamel synthesis kettle, the molar ratio of precipitant to ferrous sulfate is (0.6~1): 1, keep the temperature constant and stir for 0.5~2h, let stand until the precipitation is complete, recover the supernatant, and the resulting precipitate is nanoscale ferrous oxalate;(3) washing of nanoscale ferrous oxalate, add deionized water and stir for 3~5min, then stand and filter and separate, repeated washing to check no precipitation with barium chloride solution with mass fraction of 20% ~ 30%;(4) drying of nanoscale ferrous oxalate drying the washed nanoscale ferrous oxalate, and the obtained is nanoscale ferrous oxalate. |
solubility in water (g/100ml) | dissolved grams per 100ml of water: 8 × 10-3/20 ℃ |
toxic substance data | information provided by: pubchem.ncbi.nlm.nih.gov (external link) |