IL33005A - Composite potassium-magnesiumnitrogen fertilizers - Google Patents

Description

fertilisers HAIFA CHEMICALS This invention relates to fhe of composite is and different are used for different fertilisers contain potassium magnesium sulfate and ammonium the and magnesium sulfates are as a rule in the form of of the naturally occurring double composite fertilisers have certain the in small is frequently ap to a ballast undesirably the proportion of the useful elements and nitrogen the some cases the sulfate ions since above certain concentrations they specific adverse effects on they are a general in acidic soils below since they further increase the acidity of the and in saline soils since they increase the further d of these known composite fertilizers consists in the impossibility of prilling for various prills are now considered to be an especially desirable form of as a composite fertilizers ing the sulfates of and magnesium tend to fhe invention has the object to a composite ertilizer contains a high aggregate proportion of these three desired elements but none of undesirable which not which can be the composite fertilizer according to the invention consists in prills of potassium nitrate containing from to about calculated on the weight of the of finely dispersed magnesium In context of invention the includes both and both of which may be of any desired suitable the requirement that the magnesium oxide be finely dispersed in the prills of this invention makes desirable to as a starting a oxide or hydroxide that has been prepared in a finely comminuted form the and need not be an oxide or hydroxide prepared by or an oxide by the thermal sitio of spray of melted magnesium chloride or proportion of magnesium oxide in the prills will determined by agronomic considerations i accordance the needs of the soil or the proportion of about calculated as on the weight of the can as a rule be considered to be an Against a proportion of about is a technical rather than agronomical since higher magnesium oxide contents prilling operation is liable to become By an optional of the invention the prills may contain further such as trace elements a source of nitrogen of higher nitroge percentage than potassium nitrate for the total nitrogen percentage of the Examples of desirable trace elements are ey are added in the form of compounds which may be either meltable or at the prilling temperature as invention enables the desired mutual proportions of the three main ingredients magnesium and and of the optional further to be regulated as required in each particular The invention also provides processes for facturing the prills defined By one process of the a dry mixture of potassium nitrate and magnesium oxide if the further is and the mixture is heated to a temperature at which the potassium nitrate is melted and the mixture becomes sufficiently thinly fluid for usually between and and By another process according to the a melt is first prepared of potassium and possibly of such optional additives as become equally melted at the melting temperature of the potassium then the magnesium oxide and possibly other additives are added to the melt and the mixture is The prills according to the invention provide important both technical and From a technical point of view it is an advantage that the prills are and easy to handle and the desired mutual proportions of their ingredients can be regulated very From an agronomical point of and also from the point of view of bulk in handling and it is advantageous that the percentage of the main fertilizing magnesium and is considerably higher than in known composite the nesium is in a form which is especially is liable to toe washed out before the is taken up the On the other the release of the magnesium oxide is not too It has in accordance the that the solubility of magnesium oxide in acids is siderably enhanced b the presence of potassium prills according to the the magnesium to the soil in a in which it is not washed out and yet readily and continuously available to the composite fertilizers according to the invention are especiall useful for fertilizing acidic they can be used with good advantage light of all not necessarily acidic and in organic soils eve if they are not invention is illustrated by the following Example to which it is not limitedί 92 Kg of potassium nitrate of purity are at then 8 kg of finely powderous introduced into the melt fhe geneous mixture is thereafter prilled by means of a conventional prilling fhe prills contains by weight fhe balance up to is constituted by oxygen and the impurities of the potassium nitrate starting insufficientOCRQuality

Claims (1)

1. being prills of potassium aitrate containing from about 1 to about oalouiated on the weight of the of finely dispersed magnesium Prills according to Claim containing trace elements as Prills according to Claim t or containing an additional source of nitrogen of higher nitrogen percentage than potassium A process for the manufacture of composite fertilizers according to Claim 2 or wherein a dry mixture of potassium nitrate and magnesium oxide if the further is prepared and the mixture is heated to a temperature at which the potassium nitrate is melted and the mixture becomes sufficiently thinly fluid for usually between 350 and and Δ process for the manufacture of composite fertilizers according to Claim 2 or wherein a melt is first prepared of potassium and possibly of such optional additives as become equally melted at the melting temperature of the potassium then the magnesium oxide and possibly other additives added to the melt and the mixture is For the Applicants insufficientOCRQuality