초록 ▼

A silica glass crucible is disclosed comprising a barium-doped inner wall layer. The crucible is made by introducing into a rotating crucible mold bulk silica grain to form a bulky wall. After heating the interior of the mold to fuse the bulk silica grains, an inner silica grain, doped with barium,

A silica glass crucible is disclosed comprising a barium-doped inner wall layer. The crucible is made by introducing into a rotating crucible mold bulk silica grain to form a bulky wall. After heating the interior of the mold to fuse the bulk silica grains, an inner silica grain, doped with barium, is introduced. The heat at least partially melts the inner silica grain, allowing it to fuse to the wall to form an inner layer. The inner layer of the crucible crystallizes when used in a CZ process, extending the operating life of the crucible.

대표청구항 ▼

A silica glass crucible is disclosed comprising a barium-doped inner wall layer. The crucible is made by introducing into a rotating crucible mold bulk silica grain to form a bulky wall. After heating the interior of the mold to fuse the bulk silica grains, an inner silica grain, doped with barium,

A silica glass crucible is disclosed comprising a barium-doped inner wall layer. The crucible is made by introducing into a rotating crucible mold bulk silica grain to form a bulky wall. After heating the interior of the mold to fuse the bulk silica grains, an inner silica grain, doped with barium, is introduced. The heat at least partially melts the inner silica grain, allowing it to fuse to the wall to form an inner layer. The inner layer of the crucible crystallizes when used in a CZ process, extending the operating life of the crucible. form of a compound selected from the group consisting of calcium compounds, sodium compounds, potassium compounds, magnesium compounds and combinations thereof. 30. A method as recited in claim 1, further comprising the step of adding a sulfate-binding material to said pressure oxidizing step, said sulfate-binding material being in the form of a compound selected from the group consisting of calcium carbonate, calcium oxide, calcium hydroxide and combinations thereof. 31. A method as recited in claim 1, further comprising the step of adding a sulfate-binding material to said pressure oxidizing step, wherein said sulfate-binding material is in the form of a carbonate compound. 32. A method as recited in claim 1, wherein said pressure oxidizing step comprises the steps of pressure oxidizing said aqueous feed slurry in an autoclave and monitoring the value of at least one property of contents of said slurry within said autoclave, analyzing the value, and based on the analyzing, adjusting a feed rate to the reactor of at least one of a sulfate-binding material and said mineral feed. 33. A method as recited in claim 32, wherein said at least one property is temperature. 34. A method as recited in claim 32, wherein said at least one property is pressure. 35. A method as recited in claim 1, further comprising the step of monitoring the value of at least one property of said discharge slurry, analyzing the value and based on the analyzing, adjusting a process variable selected from mineral feed feed rate, sulfate-binding material feed rate and temperature. 36. A method as recited in claim 35, wherein said at least one property is iron concentration in said discharge slurry. 37. A method as recited in claim 35, wherein said at least one property is emf. 38. A method as recited in claim 35, wherein said at least one property is free acid level. 39. A method as recited in claim 1, further comprising the step of monitorin