The present disclosure relates to electroless plating process for preparing microcapsules comprising an ionic shell encapsulating a fluid core. Platinum nanoparticles are used as the catalyst for the electroless plating process and are found in the fluid core. The ionic shell is comprised of inorganic salts, such as salts of alkaline earth metals. In particular electroless plating of calcium phosphate shell on to fluid cores, polymer encapsulated fluid cores and gel cores are disclosed.

The present disclosure relates to electroless plating process for preparing microcapsules comprising an ionic shell encapsulating a fluid core. Platinum nanoparticles are used as the catalyst for the electroless plating process and are found in the fluid core. The ionic shell is comprised of inorganic salts, such as salts of alkaline earth metals. In particular electroless plating of calcium phosphate shell on to fluid cores, polymer encapsulated fluid cores and gel cores are disclosed.

Urea based nitrogenous fertilizers are described which have reduced water solubility. The fertilizers are intended to provide environmental benefits and economic advantages over urea. The fertilizers are a product of reaction of urea with polyphosphates whereby the urea is trapped within the polyphosphate crystal cage. The fertilizers contain nitrogen, phosphorus and one or more of calcium, magnesium and iron. The fertilizers optionally contain other nitrogen compounds and optionally other micronutrients. The fertilizers are granular.

Urea based nitrogenous fertilizers are described which have reduced water solubility. The fertilizers are intended to provide environmental benefits and economic advantages over urea. The fertilizers are a product of reaction of urea with polyphosphates whereby the urea is trapped within the polyphosphate crystal cage. The fertilizers contain nitrogen, phosphorus and one or more of calcium, magnesium and iron. The fertilizers optionally contain other nitrogen compounds and optionally other micronutrients. The fertilizers are granular.

A method for preparing a flowable liquid fertilizer, the method comprising the steps of providing a solution of potassium calcium polyphosphate; and introducing a water-soluble calcium salt to the aqueous solution of tetrapotassium pyrophosphate to form the flowable liquid fertilizer in the form of an aqueous dispersion.

A method for preparing a flowable liquid fertilizer, the method comprising the steps of providing a solution of potassium calcium polyphosphate; and introducing a water-soluble calcium salt to the aqueous solution of tetrapotassium pyrophosphate to form the flowable liquid fertilizer in the form of an aqueous dispersion.

A method for preparing a flowable liquid fertilizer, the method comprising the steps of providing a solution of potassium calcium polyphosphate; and introducing a water-soluble calcium salt to the aqueous solution of tetrapotassium pyrophosphate to form the flowable liquid fertilizer in the form of an aqueous dispersion.

The present invention relates to a polyphosphoric acid calcium magnesium fertilizer prepared by using phosphoric acid and phosphorus tailings as raw materials and a preparation method therefor. The polyphosphoric acid calcium magnesium fertilizer is prepared by using phosphorus tailings and phosphoric acid as raw materials. Based on P.sub.2O.sub.5, MgO and CaO, in the polyphosphoric acid calcium magnesium fertilizer: total phosphorus is 50-68%, effective phosphorus is 47-66%, total magnesium is 5-18%, effective magnesium is 4-15%, total calcium is 11-20%, effective calcium is 10-18%, and all are expressed in mass percentage. Based on P.sub.2O.sub.5, the polymerization rate of the polyphosphoric acid calcium magnesium fertilizer is 50%. The present invention also provides a preparation method for the fertilizer. The phosphorus in the product prepared by the invention has sustained-release properties. The fertilizer is well suited for crops requiring large amounts of calcium and magnesium.

The present invention relates to a polyphosphoric acid calcium magnesium fertilizer prepared by using phosphoric acid and phosphorus tailings as raw materials and a preparation method therefor. The polyphosphoric acid calcium magnesium fertilizer is prepared by using phosphorus tailings and phosphoric acid as raw materials. Based on P.sub.2O.sub.5, MgO and CaO, in the polyphosphoric acid calcium magnesium fertilizer: total phosphorus is 50-68%, effective phosphorus is 47-66%, total magnesium is 5-18%, effective magnesium is 4-15%, total calcium is 11-20%, effective calcium is 10-18%, and all are expressed in mass percentage. Based on P.sub.2O.sub.5, the polymerization rate of the polyphosphoric acid calcium magnesium fertilizer is 50%. The present invention also provides a preparation method for the fertilizer. The phosphorus in the product prepared by the invention has sustained-release properties. The fertilizer is well suited for crops requiring large amounts of calcium and magnesium.

The present invention relates to a polyphosphoric acid calcium magnesium fertilizer prepared by using phosphoric acid and phosphorus tailings as raw materials and a preparation method therefor. The polyphosphoric acid calcium magnesium fertilizer is prepared by using phosphorus tailings and phosphoric acid as raw materials. Based on P.sub.2O.sub.5, MgO and CaO, in the polyphosphoric acid calcium magnesium fertilizer: total phosphorus is 50-68%, effective phosphorus is 47-66%, total magnesium is 5-18%, effective magnesium is 4-15%, total calcium is 11-20%, effective calcium is 10-18%, and all are expressed in mass percentage. Based on P.sub.2O.sub.5, the polymerization rate of the polyphosphoric acid calcium magnesium fertilizer is 50%. The present invention also provides a preparation method for the fertilizer. The phosphorus in the product prepared by the invention has sustained-release properties. The fertilizer is well suited for crops requiring large amounts of calcium and magnesium.