盐酸分解高硅混合型胶磷矿工艺研究

doi:10.11962/1006-4990.2020-0142

Abstract

Abstract:

The development and utilization of middle/low-grade phosphate rock is the basic guarantee for the sustainable de-velopment of China′s phosphate chemical industry.High silicon phosphate ore was leached by hydrochloric acid,and its aci-dolysis process and filtration strengthening process were studied by single factor experiment.The results showed that under the optimal conditions,such as phosphate ore particle size was less than 180 μm,reaction temperature was 40 ℃,hydrochloric acid ratio（the mass ratio of actual hydrochloric acid input to theoretical acid consumption） was 1.1,HCl mass fraction was more than 20%,leaching time was 10 min,then the leaching extent of P₂O₅ was more than 99%.The leaching rate of phosphate ore in hydrochloric acid is fast and the leaching extent is high.The content of silicon dioxide in acidolysis slurry of high silicon phosphate rock is high,with small particle size and slow settling rate in the acidolysis slurry make it difficult to filter.By adding non-ionic polyacrylamide flocculant,the mass of flocculant was controlled to be 1.0% of the quality of acidolysis slurry and settling for 2 min,the filtration was strengthened significantly.

Key words: hydrochloric acid, high silicon phosphate ore, leaching, strengthen filtration

CLC Number:

TQ126.3

Zheng Dongyao,Tang Shengwei,Lü Li. Study on process of hydrochloric acid leaching high silicon mixed phosphate ore[J]. Inorganic Chemicals Industry, 2021, 53(2): 81-83.

w（P₂O₅）	w（CaO）	w（Fe₂O₃）	w（Al₂O₃）	w（MgO）
28.55	37.61	1.10	1.72	0.19
w（K₂O）	w（F）	w（SiO₂）	烧失量	w（其他）
0.46	1.85	21.33	2.40	4.79

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Inorganic Acid-Base-Salt Committee of CIESC

Study on process of hydrochloric acid leaching high silicon mixed phosphate ore

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