Method for processing meat-and-bone meal

Abstract

A method for processing meat-and-bone meal for obtaining ashes includes steps of: feeding a catalytic fluidized bed gasifier with a meat-and-bone meal and an orthosilicate with a gas stream comprising oxygen, for obtaining a synthetic gas stream and ashes, wherein the catalytic fluidized bed gasifier is at a temperature from 400° C. to 1000° C.; grinding the obtained ashes; feeding a thermal boiler with the ground ashes, the obtained synthetic gas and a gas stream comprising oxygen for separating the ashes from the orthosilicate, wherein the thermal boiler is at a temperature from 600° C. to 2000° C.; and collecting the separated ground ashes.

1 . A method for processing meat-and-bone meal for obtaining ashes, comprising the following steps:
 feeding a catalytic fluidised bed gasifier with a meat-and-bone meal and an orthosilicate with a gas stream comprising oxygen, for obtaining a synthetic gas stream and ashes, wherein the catalytic fluidized bed gasifier is at a temperature from 400° C. to 1000° C.;   grinding the obtained ashes yielding ground ashes;   feeding a thermal boiler with the ground ashes, the obtained synthetic gas, and a gas stream comprising oxygen for separating the ashes from the orthosilicate, wherein the thermal boiler is at a temperature from 600° C. to 2000° C.; and   collecting the separated ground ashes.   
     
     
         2 . The method according to  claim 1 , wherein the synthetic gas stream is a hydrogen riched gas. 
     
     
         3 . The method according to  claim 1 , wherein the catalytic fluidized bed gasifier is fed with a water steam. 
     
     
         4 . The method according to  claim 1 , wherein the stream comprising oxygen is an air stream or an oxygen stream. 
     
     
         5 . The method according to  claim 1 , further comprising feeding a cyclone with the synthetic gas of the catalytic fluidized bed gasifier for obtaining fine ashes. 
     
     
         6 . The method according to  claim 5 , further comprising feeding the thermal boiler with the fine ashes obtained in the cyclone. 
     
     
         7 . The method according to  claim 1 , wherein the thermal boiler is further fed with an amount of synthetic gas. 
     
     
         8 . The method according to  claim 6 , further comprising feeding a silo with the fine ashes from the thermal boiler. 
     
     
         9 . The method according to  claim 1 , wherein the reactor is at a pressure from 90 kPa to 110 kPa. 
     
     
         10 . The method according to  claim 1 , wherein the catalytic fluidised bed gasifier is at a temperature from 450° C. to 950° C. 
     
     
         11 . The method according to  claim 1 , wherein the grinding of the ashes is made in a mill. 
     
     
         12 . The method according to  claim 1 , wherein the thermal boiler is at a temperature from 750° C. to 1500° C. 
     
     
         13 . The method according to  claim 1 , wherein orthosilicate is selected from any of Dolomite, Alkaline metal, Olivine, Nickel or their mixtures. 
     
     
         14 . The method according to  claim 1 , further comprising feeding a buffer with the ground ashes for retaining the ground ashes before the feeding the thermal boiler. 
     
     
         15 . The method according to  claim 1 , wherein the amount of ground ashes obtained is 20 to 25% (wt/wt meat and bone meal ). 
     
     
         16 . The method according to  claim 1 , wherein the dimension of the ground ashes less than 3 mm. 
     
     
         17 . The method according to  claim 5 , wherein the dimension of the fine ashes is from 0.5 to 5 micrometres. 
     
     
         18 . Ashes obtained by the method according to  claim 1 .