FACTORS AFFECTING THE SOLUBILITY OF PHOSPHATE ROCK RESIDUES IN 2-PERCENT CITRIC-ACID AND 2-PERCENT FORMIC-ACID

被引：9

作者：

BRAITHWAITE, AC

EATON, AC

GROOM, PS

机构：

[1] Chemistry Division, Department of Scientific and Industrial Research, Auckland

来源：

FERTILIZER RESEARCH | 1990年 / 23卷 / 01期

关键词：

2% citric acid solubilities; 2% formic acid solubilities; Chemical extractants; impurity effects; partially acidulated phosphate rocks; residual phosphate rock; solubility percentages;

D O I：

10.1007/BF02656130

中图分类号：

S15 [土壤学];

学科分类号：

0903 ; 090301 ;

摘要：

The 2% citric and formic acid solubilities of phosphate rock residues extracted from partially acidulated materials (20 and 35% acidulation) manufactured from two phosphate rocks (both ground and unground) in the presence of monocalcium phosphate, monosodium phosphate, calcium chloride, calcium sulphate, calcium carbonate, sodium carbonate and aluminium and iron sulphates have been examined. Such figures have been compared with previous results obtained for the equivalent unprocessed phosphate rocks. In general the effects of additives on the solubility of the phosphate rock residues were similar to those found for unprocessed phosphate rocks. However, the solubility figures were considerably lower for the 20% acidulated residues, while 2% formic acid solubilities for the 35% acidulated residues were also reduced. This would indicate that some deactivation of the phosphate rock had taken place during acidulation, the degree of which was dependent on the acidulation level and could be more readily observed in changes in 2% formic acid solubility than in 2% citric acid figures. © 1990 Kluwer Academic Publishers.

引用

页码：37 / 42

页数：6

共 3 条

[1]

Braithwaite A.C., The use of chemical solubility tests in comparing phosphate fertilizers, Fert Res, 12, pp. 185-192, (1987)

[2]

Braithwaite, Groom P.S., Some factors associated with the use of the extractants 2% citric acid and 2% formic acid as estimators of available phosphorus in fertilizer products, Fert Res, 19, pp. 175-181, (1989)

[3]

Charleston, Brown I.W.M., The nature of the residual apatites remaining after partial acidulation of phosphate rocks with phosphoric and sulphuric acids, Fert Res, 18, pp. 257-273, (1989)

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