Method and system for heating and cooling slurries

A method for treating a slurry, comprising:

• feeding the slurry through a first float-type pump to increase a first pressure to a second pressure to form a second pressure slurry;
• then feeding the second pressure slurry at a first temperature, to a first heat exchanger to increase the first temperature to a second temperature, to form a second pressure, second temperature slurry, wherein the first heat exchanger uses a first heat transfer medium;
• then feeding the second pressure, second temperature slurry that has been heated by the first heat exchanger to at least one autoclave to change the second temperature to a third temperature to form a second pressure, third temperature slurry;
• then feeding the second pressure, third temperature slurry to a second heat exchanger to decrease the third temperature to a fourth temperature, to form a second pressure, third temperature slurry, wherein the second heat exchanger uses the first heat transfer medium;
• then feeding the second pressure, third temperature slurry through a second float-type pump to decrease the second a pressure to a third pressure to form a third pressure, third temperature slurry;
• and discharging the third pressure, third temperature slurry.

A method for treating a slurry, comprising:

• providing a first heat exchanger having a tube side and a shell side;
• providing a second heat exchanger having a tube side and a shell side;
• increasing a first pressure of the slurry to a second pressure with a first float-type pump to form a second pressure slurry;
• then directing the second pressure slurry into the tube side of the first heat exchanger to increase a first temperature of the second pressure slurry to a second temperature to form a second pressure, second temperature slurry with a first heat transfer medium within the shell side of the first heat exchanger;
• then changing the second temperature of the second pressure, second temperature slurry to a third temperature to form a second pressure, third temperature slurry;
• then directing the second pressure, third temperature slurry into the tube side of the second heat exchanger to decrease the third temperature of the slurry to a fourth temperature to form a second pressure, fourth temperature slurry with the first heat transfer medium from the first heat exchanger within the shell side of the second heat exchanger;
• then decreasing the second pressure of the slurry to a third pressure to form a third pressure, fourth temperature slurry with a second float-type pump;
• and discharging the third pressure, fourth temperature slurry.