本文選題：碳酸鑭 + 碳酸氫銨　； 參考：《稀有金屬與硬質(zhì)合金》2017年02期

【摘要】：以碳酸氫銨-氨水作為混合沉淀劑,氯化鑭溶液為料液,采用并流沉淀法制備碳酸鑭產(chǎn)品,考察了底液中稀土濃度、反應(yīng)時(shí)間及沉淀廢水回用對(duì)產(chǎn)品質(zhì)量的影響,并對(duì)產(chǎn)品物相結(jié)構(gòu)和形貌進(jìn)行了表征,最后與采用碳酸氫銨作為沉淀劑的工藝進(jìn)行了技術(shù)指標(biāo)對(duì)比。結(jié)果表明,在控制底液中稀土濃度為30g/L,反應(yīng)時(shí)間為7h,沉淀廢水回用的條件下,產(chǎn)品的主要成分為L(zhǎng)a_2(CO_3)3·8H_2O,Cl~-含量0.07%,稀土總量≥45%。沉淀1t稀土氧化物產(chǎn)出5.9m~3沉淀廢水,廢水中氯化銨含量為169g/L。與采用碳酸氫銨作為沉淀劑的工藝相比,采用混合沉淀劑一方面大幅降低了廢水的產(chǎn)出量,進(jìn)而減少了廢水的治理成本;另一方面有效利用了C元素,從而降低了溫室氣體CO_2的排放量和碳酸氫銨的使用量,具有良好的經(jīng)濟(jì)和環(huán)境效益。
[Abstract]:Using ammonium bicarbonate and ammonia as mixed precipitating agent and lanthanum chloride solution as feed solution, lanthanum carbonate products were prepared by parallel flow precipitation method. The effects of rare earth concentration, reaction time and reuse of precipitation wastewater on product quality were investigated. The phase structure and morphology of the product were characterized and compared with the technology using ammonium bicarbonate as precipitant. The results showed that under the conditions of controlling the concentration of rare earth in the solution of 30 g / L, reaction time of 7 h and the reuse of precipitation wastewater, the main component of the product was La_2(CO_3)3 _ 8H _ 2O _ 2O _ (Cl-O _ (-) -0.07%), and the total amount of rare earth was 鈮，

本文編號(hào)：1886983