Process for the manufacture of bio-release fertilizers of zinc-iron-manganese, iron-manganese-copper and zinc-iron manganese-copper
AssigneeNational Research Development Corporation
InventorChandrika Varadachari
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Abstract
A process for the preparation of water insoluble bio-release micronutrient fertilizers, containing iron and manganese with either zinc and/or copper, comprising (a) heating orthophosphoric acid at a temperature of 130° C.-150° C. with a mixture of (i) source of iron oxide, (ii) manganese dioxide or pyrolusite, and (iii) either or both compounds of zinc or copper selected from zinc ash or zinc oxide and cupric oxide, or cupric sulphate or cupric chloride and (iii) a basic compound such as oxide or carbonate of magnesium or calcium, to produce a multi-metallic polyphosphate; (b) neutralization of the polyphosphate with a basic compound followed by drying and pulverization to obtain a solid powdery material.
Claims26
A process for the preparation of water insoluble bio-release micronutrient fertilizers, containing iron and manganese with zinc and/or copper, comprising:
- heating orthophosphoric acid at a temperature of 130° C.-150° C. with a mixture of iron oxide, manganese dioxide or pyrolusite, compounds comprising zinc and/or compounds comprising copper, and a basic compound to produce a multi-metallic liquid polyphosphate;
- neutralizing the polyphosphate with the basic compound to form a neutralized polyphosphate;
- and
- drying and pulverizing the neutralized polyphosphate to obtain a solid powdery material.
A solid, powdery, water-insoluble, slow-releasing fertilizer comprising:
- zinc-iron-manganese polyphosphate, iron-manganese-copper polyphosphate and zinc-iron-manganese-copper polyphosphate together with one or more bases of magnesium, calcium or ammonium, wherein the polyphosphate is only partially polymerized.
Dependencies are inferred from the claim text.