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A method and apparatus is employed to create a mixture having a desired composition. A raw material is separated in a pair of density separators into constituent parts. Those parts are then recombined in a desired fashion using a pair of splitters to create an intermediate mixture and delivered to a

A method and apparatus is employed to create a mixture having a desired composition. A raw material is separated in a pair of density separators into constituent parts. Those parts are then recombined in a desired fashion using a pair of splitters to create an intermediate mixture and delivered to a third density separator. The third density separator processes the intermediate mixture to create a final mixture having the desired composition.

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What is claimed is: 1. A method for producing a desired mixture of a granular material comprising the steps of: a. using a first density separator comprising a tank to separate raw mixture into a first desired fraction and a first intermediate fraction; b. using a second density separator comprisin

What is claimed is: 1. A method for producing a desired mixture of a granular material comprising the steps of: a. using a first density separator comprising a tank to separate raw mixture into a first desired fraction and a first intermediate fraction; b. using a second density separator comprising a tank to separate a raw mixture into a second desired fraction and a second intermediate fraction; c. using a pair of splitters to create a desired intermediate mixture of said first and second intermediate fractions and deliver a desired quantity of said intermediate mixture to a third density separator; and d. using said third density separator to separate said desired quantity of said intermediate mixture into a waste fraction and a fraction which is added to the once separated first desired fraction and the once separated second desired fraction to produce a desired mixture of a granular material. 2. The method of claim 1 further comprising the steps of indicating the average particle size of the raw material delivered to the first density separator by measuring the quantity of material delivered to the density separator, measuring the quantity of material exiting one of the ports of the density separator, calculating the quantity exiting the other port of the density separator, making a comparison of the ratio of the materials exiting the ports of the density separator to the known size at which particles are separated by the density separator, and using the result of said comparison to control the operation of at least one of said first density separator, second density separator, said pair of splitters, or said third density separator. 3. The method of claim 1 wherein the operation of said density separators is controlled by a controller. 4. The method of claim 3 wherein said controller transmits data to a remote computer. 5. The method of claim 3 wherein said controller receives programmable parameters from a remote computer. 6. The method of claim 3 wherein the controller, determines the specific gravity and the height of the mixtures in the density separators such that these are maintained irrespective of the feed gradation or feed rate provided to the density separators. 7. The method of claim 1 wherein the quantity of material supplied to at least one of said density separators is varied to maintain the bed height and specific gravity of the contents of the tank of said at least one of said density separators. 8. A method for producing a desired mixture of a granular material comprising the steps of: a. using a first density separator comprising a tank to separate raw mixture into a once separated first desired fraction and a first intermediate fraction; b. using a second density separator comprising a tank to separate a raw mixture into a once separated second desired fraction and a second intermediate fraction; c. using a pair of splitters to create a desired intermediate mixiure of said first and second intermediate fractions and deliver a desired quantity of said intermediate mixture to a third density separator; d. using said third density separator to separate said desired quantity of said intermediate mixture into a waste fraction and a fraction which is added to the once separated first desired fraction and the once separated second desired fraction to produce a desired mixture of a granular material; and e. wherein the quantity of material supplied to at least one of said density separators is varied to maintain the bed height and specific gravity of the contents of the tank of said at least one of said density separators. 9. The method of claim 8 further comprising the steps of indicating the average particle size of the raw material delivered to the first density separator by measuring the quantity of material delivered to the density separator, measuring the quantity of material exiting one of the ports of the density separator, calculating the quantity exiting the other port of the density separator, making a comparison of the ratio of the materials exiting the ports of the density separator to the known size at which particles are separated by the density separator, and using the result of said comparison to control the operation of at least one of said first density separator, second density separator, said pair of splitters, or said third density separator. 10. The method of claim 8 wherein the operation of said density separators is controlled by a controller. 11. The method of claim 10 wherein said controller transmits data to a remote computer. 12. The method of claim 10 wherein said controller receives programmable parameters from a remote computer. 13. The method of claim 10 wherein the controller determines the specific gravity and the height of the mixtures in the density separators such that these are maintained irrespective of the feed gradation or feed rate provided to the density separators.