| 摘要 |
PROBLEM TO BE SOLVED: To precisely control the flow rates of an aqueous silver nitrate solution and an aqueous halogen salt solution added to a protective colloidal solution in wide flow rate ranges when the aqueous solutions are fed into a precipitation vessel in which the colloidal solution is present. SOLUTION: The producing apparatus 1 comprises an aqueous silver nitrate solution tank 11, an aqueous halogen salt solution tank 12, a precipitation vessel 13, solution feeding lines 16 and 17 and a flow rate controller 31. Pressure measured with each pressure sensor 24 and flow rate measured with each flow rate detector 28 are converted to signals and sent to the flow rate controller 31. The controller 31 sends control signals to pressure regulators 20 and opening regulators 29 so as to control the flow rates in the solution feeding lines 16 and 17 to previously inputted prescribed values. The pressures in the tanks 11 and 12 and the openings of the lines 16 and 17 are regulated to adequate values.
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