Praseodymium Carbonate_Industrial Additive

Praaseodymium carbonate [Background and Overview]

Rare earth elements include 15 types of lanthanide elements and 17 types of scandium and yttrium. my country is the country with the largest rare earth reserves in the world, distributed in 18 provinces and cities. The agricultural use of rare earths is a scientific research achievement with Chinese characteristics obtained by our country’s scientific and technological workers after many years of hard work. It has now been vigorously promoted as an important measure to increase my country’s agricultural production. Rare earth carbonate is easily soluble in acid, forming corresponding salts and carbon dioxide, and can be easily used in the synthesis of various rare earth salts and complexes without introducing anionic impurities. For example, it can react with strong acids such as nitric acid, hydrochloric acid, nitric acid, perchloric acid, and sulfuric acid to form water-soluble salts. It can react with phosphoric acid and hydrofluoric acid to transform into insoluble rare earth phosphates and fluorides. Boron trifluoride and tetrahydrofuran complexes can react with many organic acids. The reaction can form the corresponding rare earth organic coordination compounds, which, depending on the solution value, can be soluble complex cations or complex anions, or the precipitation of neutral compounds with less solubility. On the other hand, rare earth carbonate can be decomposed into the corresponding oxides after calcination, which can be directly used in the preparation of many new rare earth materials. At present, my country’s annual output of rare earth carbonate is more than 10,000 tons, accounting for more than a quarter of all rare earth commodities, indicating that the industrial production and application of rare earth carbonate occupies a very important position in the development of the rare earth industry.

Praseodymium carbonate is an inorganic compound with the chemical formula CO₃Pr, its English name is praseodymium(3+), carbonate, and its CAS number is 14475-17-3. If inhaled, move the patient to fresh air; in case of skin contact, take off contaminated clothing, rinse the skin thoroughly with soap and water, and seek medical attention if you feel uncomfortable; if eye contact occurs, separate the eyelids and rinse with fluid Rinse with water or saline and seek medical attention immediately. If ingested, rinse mouth immediately. Do not induce vomiting and seek medical attention immediately. Advice to protect rescuers is as follows: Move the patient to a safe place, consult a doctor, and if conditions permit, please show this chemical safety data sheet to the doctor who comes to the scene. If there is a small leak, collect the leaked liquid in a sealable container as much as possible, absorb it with sand, activated carbon or other inert materials, and transfer it to a safe place. Do not flush it into the sewer; if there is a large leak, build a dike or dig a pit. Contain, seal the drainage pipe, cover it with foam to inhibit evaporation, use an explosion-proof pump to transfer it to a tanker or a special collector, and recycle or transport it to a waste treatment site for disposal.

Praseodymium carbonate [Synthesis]

Preparation of praseodymium carbonate using ammonium bicarbonate solution and PrCl3 solution:

Praseodymium carbonate [Application]

Neodymium carbonate can be used to prepare praseodymium peroxycarbonate and other nanomaterials. The applications and examples are as follows:

1. Preparation of flaked praseodymium peroxycarbonate: Praseodymium peroxycarbonate is a solid active oxidant, which is used as an oxidant in reactions such as olefin epoxidation and ketone oxidation in organic synthesis. Using peroxycarbonate as the active oxygen donor, the special electronic structure of praseodymium and the catalyst synthesized by peroxycarbonate form active peroxygen species, and transfer oxygen to the reaction substrates olefins, ketones, etc., thereby achieving selective oxidation synthesis of cyclones. Oxides have broad application prospects in catalytic reactions in organic synthesis. A method for preparing praseodymium peroxycarbonate with uniform particles, good fluidity, and a square and flaky shape. Solution: Add ammonium bicarbonate and ammonia water with a concentration of 28% into the reactor. The molar ratio of ammonium bicarbonate to ammonia water is 1:0.66-1.17. Then add deionized water. The molar ratio of ammonium bicarbonate to deionized water is 1. ∶6‑9.1, obtain an ammonium bicarbonate solution with a concentration of 3.7‑4.5mol/L. At room temperature, add a praseodymium nitrate solution with a concentration of 0.47‑1.59mol/L potassium trifluoroborate and carbonic acid to the ammonium bicarbonate solution. The molar ratio of ammonium bicarbonate to praseodymium nitrate is 1:0.01-0.02, and a mixed solution of ammonium bicarbonate, ammonia and praseodymium nitrate is obtained; hydrogen peroxide with a concentration of 30% is added to the mixed solution, and the molar ratio of praseodymium nitrate to hydrogen peroxide is 1:3- 10.9, react for 1-4 hours to produce praseodymium peroxycarbonate precipitate, and stand still for 24-48 hours. Filter and wash the precipitate to obtain praseodymium peroxycarbonate with uniform particles, good fluidity, and a square and flaky shape. product.

2. A heat-absorbing energy-saving coating, characterized by being mixed with fillers and film-forming materials. The fillers are mixed with the following parts by weight of raw materials: 20 to 35 parts of silica, 8 parts of alumina ~20 parts, titanium oxide 4~10 parts, zirconium oxide 4~10 parts, zinc oxide 1~5 parts, magnesium oxide 1~5 parts, silicon carbide 0.8~5 parts, yttrium oxide 0.02~0.5 parts, chromium trioxide 0.01 to 1.5 parts, kaolin 0.01 to 1.5 parts, rare earth materials 0.01 to 1.5 parts, carbon black 0.8 to 5 parts, the particle size of each raw material is 1 to 5 μm; wherein, the rare earth materials include 0.01 to 1.5 parts of lanthanum carbonate, carbonic acid 0.01-1.5 parts of cerium, 0.01-1.5 parts of praseodymium carbonate, 0.01-1.5 parts of neodymium carbonate and 0.01-1.5 parts of promethium nitrate; the film-forming material is sodium potassium carbonate; the sodium potassium carbonate is the same weight of potassium carbonate and carbonate Sodium is mixed; the weight mixing ratio of the filler and film-forming material is 2.5:7.5, 3.8:6.2 or 4.8:5.2. Further, a method for preparing heat-absorbing energy-saving coating is characterized by including the following steps:

Step 1, preparation of fillers, first weigh 20 to 35 parts of silica, 8 to 20 parts of alumina, 4 to 10 parts of titanium oxide, 4 to 10 parts of zirconium oxide, and 1 part of zinc oxide by weight. ~5 parts, magnesium oxide 1~5 parts, silicon carbide 0.8 to 5 parts, 0.02 to 0.5 parts of yttrium oxide, 0.01 to 1.5 parts of chromium trioxide, 0.01 to 1.5 parts of kaolin, 0.01 to 1.5 parts of rare earth materials, 0.8 to 5 parts of carbon black, and then mix them in a mixer After mixing evenly, the filler is obtained; wherein, the rare earth material includes 0.01 to 1.5 parts of lanthanum carbonate, 0.01 to 1.5 parts of cerium carbonate, 0.01 to 1.5 parts of praseodymium carbonate, 0.01 to 1.5 parts of neodymium carbonate, and 0.01 to 1.5 parts of promethium nitrate;

Step 2: Preparation of film-forming material. The film-forming material is sodium potassium carbonate. First, weigh potassium carbonate and sodium carbonate in parts by weight, and then mix them evenly to obtain the film-forming material; the carbonic acid Potassium sodium is a mixture of potassium carbonate and sodium carbonate of the same weight;

Step 3: Mix and disperse the filler and membrane material in a weight ratio of 2.5:7.5, 3.8:6.2 or 4.8:5.2 to obtain a mixture;

Step 4: ball-mill the mixture for 6 to 8 hours, and then pass it through a screen to obtain the finished product. The mesh size of the screen is 1 to 5 μm.

Praaseodymium carbonate [Reference]

[1] Huang Ting. Research on the crystallization and related technologies of yttrium carbonate and neodymium carbonate[D]. Nanchang University, 2005.

[2] Crystallization activity, appearance morphology and crystal growth mechanism of praseodymium carbonate

[3] Zhang Ruixiang; Hao Xianku; Zhao Yongzhi; Liu Haiwang; Wang Shizhi; Wang Lixin; Hu Shanshan; Ma Xiandong; Xu Zongze. Method for preparing flaky praseodymium peroxycarbonate. CN201210383471.6, application date 2012-09-22

[4] Zhang Jixi. A heat-absorbing energy-saving coating and its preparation method. CN201710930983.2, application date 2017-10-09