The Iron Phosphate Grinding Mill Manufacturer Introduces The Production Process Of Iron Phosphate As An Industrial By-product

Iron phosphate is a kind of white, pink or light yellow powder. FePO4 was initially mainly used in ceramic glass, anti-rust pigments, food additives and other fields. Subsequent research found that it has unique ion exchange capacity, catalytic properties and electrical properties, so it is widely used in the field of lithium ion batteries as a precursor of LiFePO4 cathode material. HCMilling(Guilin Hongcheng) is a manufacturer of iron phosphate grinding mill. Our iron phosphate grinding mill can be used for front-end grinding and subsequent grinding of iron phosphate, providing equipment assistance for industrial production of iron phosphate. The following describes the process of producing iron phosphate from three industrial by-products.

iron phosphate grinding mill

At present, battery grade iron phosphate is mainly prepared from analytically pure iron salt and phosphoric acid or phosphate in industry. If we can efficiently and economically recover resources from industrial by-products or industrial solid waste to prepare iron phosphate, we can not only effectively solve the problem of raw material shortage, but also realize resource reuse and environmental protection.

1、 Preparation of iron phosphate from ferrous sulfate by-product of titanium dioxide

The by-product ferrous sulfate is a solid by-product produced when ilmenite is leached with concentrated sulfuric acid to prepare titanium dioxide. The chemical formula is FeSO4·7H2O, which is an excellent iron source for preparing iron phosphate and lithium iron phosphate. Researchers take ferrous sulfate, a by-product of titanium dioxide, as raw material, dissolve and remove impurities under stirring conditions, and then filter to obtain pure ferrous sulfate solution; Add oxidant into ferrous sulfate solution to oxidize ferrous divalent to ferric iron to obtain ferric sulfate solution; Phosphorus source is added under stirring conditions to convert it into iron phosphate solution, pH is 1.8~2, and the ratio of phosphorus to iron is 1∶1.3; Add alkali solution to precipitate iron phosphate. After aging at high temperature of 80~90 ℃, iron phosphate precipitation is obtained. After standing and layering, filter while hot. The obtained filter residue is product iron phosphate. After drying at 95~100℃, use iron phosphate grinding mill to grind to obtain white yellowish powdery iron phosphate dihydrate product. Place iron phosphate dihydrate in a quartz boat and calcine at 500 ℃ for 2h to obtain anhydrous iron phosphate product.

2、 Preparation of battery grade nano-sized iron phosphate from iron phosphate slag processed by iron phosphate grinding mill

As a by-product in the production of yellow phosphorus by electric furnace method, ferrophosphorus slag has a wide range of sources, high output and low price. At present, ferrophosphorus slag is mainly used in the steelmaking industry as alloying agent and desizing agent, and also used to produce disodium hydrogen phosphate and trisodium phosphate.

Researchers from Kunming University of Science and Technology of China provide phosphorus and iron sources with iron phosphate slag as raw material, leach iron and phosphorus elements in iron phosphate slag with nitric acid and sulfuric acid mixed solution, and prepare battery grade nano-sized iron phosphate by precipitation method. The effects of nitric acid concentration, reaction time and reaction temperature on the solubility of iron phosphate slag were investigated, and the effects of the ratio of iron to phosphorus, temperature and pH during the reaction on the properties of prepared iron phosphate were studied.

3、 Preparation of battery grade iron phosphate from phosphating slag

Phosphating is the process of forming a phosphate protective film by reacting dilute phosphoric acid or acidic phosphate solution with metal surface. The phosphating film formed by phosphating can effectively reduce the contact between oxygen and surface metal ions, thus delaying the oxidation and rust of metal surface. The higher the temperature in the phosphating process, the more phosphating slag will be generated. Phosphating technology has been widely used in many fields, especially in the steel industry.

Researchers from Xiangtan University of China take zinc-containing phosphating slag as raw material, first leach it with sodium hydroxide to prepare sodium phosphate solution, then remove trace zinc in the solution by extraction, and then add ferric chloride hexahydrate into the purification solution to prepare ferric phosphate product. The research shows that the phosphate radical in the zinc-containing phosphating slag can be effectively recovered and the battery grade iron phosphate can be prepared by using the method of sodium hydroxide leaching and removing impurities with dithizone and P204 double extractant.

If you have project requirements for iron phosphate Raymond mill, please contact mkt@hcmilling.com or call at +86-773-3568321, HCM will tailor for you the most suitable grinding mill program based on your needs, more details please check www.hcmilling.com.