以活性炭为脱色剂、碳酸钠为脱氟剂,对净化湿法磷酸工艺中的影响因素进行研究,确定了湿法磷酸脱色脱氟同步进行的最佳工艺条件:采用1.0%湿法磷酸用量的活性炭,并添加1.1倍理论脱氟用量的Na2CO3,在50℃下反应120 min,处理后的湿法磷酸透光率达到80%以上,脱氟率也高于70%。

The influencing factors of purified wet-process phosphoric acid with activated carbon and Na2 CO3 as decoloring agent and defluorinating agent were studied. The best technological conditions were as follows:dosage of activated carbon was 1. 0% of wet-process phosphoric acid,dosage of Na2 CO3 was 1. 1 times theoretical amount,reaction temperature was 50 ℃ and time was 120 min. Under these condi-tions,light transmittance reached above 80% and the defluorination rate reached above 70%.

介绍了几种在含氯磷矿建设湿法磷酸工程中常用的不锈钢，结合国内外磷酸工程实例分别阐述了采用低、中、高氯磷矿在湿法磷酸生产过程的设备使用与选材经验。

Author has introduced some kinds of commonly used stainless steel in construction of phosphoric acid project by wet method with chlorine contained phosphorus ore,in combination with practical project examples at home and abroad, author has separately described the experience for equipment utilization and material selection in case of production of phosphoric acid by wet method, using phosphorus ore with low/middle/high chlorine content.

随着我国化工工业的发展，磷酸的市场需求逐年增加。目前，国内大、中型化工企业新建湿法磷酸生产装置项目逐渐增多。本文对湿法磷酸装置浓缩工序中，石墨换热器、浓缩冷凝器、第一第二氟吸收器和雾沫分离器的吊装就位方法做了粗浅地探讨。

With the development of China?s chemical industry, demands for phosphate has increased year by year. At present, new wet process phosphoric acid production device projects increased gradualy domestic large and medium-sized chemical enterprises. in this paper, the author inquires into the hoisting method of graphite heat exchanger, condenser, the first and se- cond fluorine concentration absorber and entrainment separa- tor in the concentration step of the wet phosphoric acid plant,.

研究了硫酸钡在湿法磷酸中的结晶动力学及主要杂质Mg2+、Fe3+、Al3+的影响,得到硫酸钡在湿法磷酸介质中的成核速率与晶体生长速率的关联式;Fe3+、Al3+对硫酸钡晶体生长有抑制作用,而Mg2+能促进其生长,几种杂质共存的综合作用是抑制晶体生长.

The crystallization kinetics of barium sulfate in wet-process phosphoric acid and the effects of Mg2+, Fe3+, Al3+ on crystallization were investigated. The relationship between nucleation rate and growth rate of barium sulfate in wet-process phosphoric acid was presented. Fe3+, Al3+ inhibit the crystal growth process, but Mg2+ promote it. The coexistence of impurities inhibits the crystal growth process.

采用盐酸法利用中低品位磷矿制备湿法磷酸。对反应母液的浓缩比例、矿渣循环水洗工艺以及浓缩滤液循环分解磷矿制备磷酸工艺进行了研究。结果表明，浓缩比例为0.35时，总磷沉淀率达到96.08％；循环水洗所得矿渣中硅含量大于50％，可进行硅的提取利用，矿渣中氯含量低，可直接进行干堆处理，浓缩滤液循环10次后制得的湿法磷酸经净化后P2 O5含量达到58％，达到工业级磷酸标准。该循环工艺可避免环境污染，节约资源，具有潜在的经济效益和社会效益。

Wet-process phosphoric acid was produced by hydrochlorice acid method using mid-low-grade phosphate rock.The condensation ratio of reaction mother liquor,circle washing process of slag and recycle process of production of phosphoric acid by using concentrated solution decomposing phosphoric rock were studied.The results showed that,the precipitation rate of total phosphorus was 96.08% when the condensation ratio was 0.35;the silicon content of the slag in circle washing process was above 50%,which could be extracted and used.The chlorine content of the slag was low,which could be used in dry stockpiling process.The P2 O5 content of the wet-process phosphoric acid reached 58% after 10 cycles,which was up to the factory standard. The circle process can avoid the pollution of environment and save resources.Therefore the method has the po-tential social and economic benefit.