Cultivated plants moreover the three elements of azotes, phosphor and potassium they also need sulfur. Actually, the requirement of a great numbers of cultivated productions to sulfur is not less than their necessity to phosphor so, sulfur is considered as the forth fertilizer nourishing material.

The purpose of this project technical and economical evaluation and submitting a method that by using existing equipments in sulfur granulation unit, can produce this production when it is necessary, by minimum cost and the flexibility of complex sulfur granulation unit. The probable modifications should be In a way that the primary design conditions be easily accessible.

Bentonit sulfur is a kind of fertilizer which is produced from the mixture of 10% bentonit soil with 90% melted sulfur and finally by using a granulator the produced paste changes to granule and dried. The technical and economical evaluation have been on the basis of the request for 100,000 ton per year of mentioned fertilizer. According to the following reasons the results of this evaluation shows that performing the project is economical.

1.      The net present value (NPV) is positive.

2.      Internal return rate (IRR) is more higher than 15% which is the minimum acceptable return rate.

3.      Normal return period of asset is relatively short.

4.      Break-even point is on the third year of operation and it shows that fixed costs.

On the basis of recent correspondence with soil and water researching organization of agricultural ministry the consumption of this fertilizer can be extendable to 200 thousands ton during the next five years. In order to be followed final report of the project has been sent to development management of national petrochemical company after the confirmation of the complex management.