Method for measuring concentrations of CaCO.sub.3 and CaSO.sub.3

Details Method for measuring concentrations of CaCO.sub.3 and CaSO.sub.3 Method for measuring concentrations of CaCO.sub.3 and CaSO.sub.3

1984-08-07

1987-07-28

Lacey, David L.

Chemistry: analytical and immunological testing

Automated chemical analysis

Condition or time responsive

436 52, 436 55, 436 79, 436119, 436133, 436146, 436175, 436179, 436181, G01N 100, G01N 3300, G01N 3500

Patent

active

046832106

ABSTRACT:
A method for continuously measuring the concentration of CaCO.sub.3 and/or CaSO.sub.3 in slurries comprising CaCO.sub.3 and/or CaSO.sub.3 is described. The method comprises continuouly sampling a given amount of the slurry, feeding the slurry into an agitated continuous reactor container which is isolated from the outside air and in which the slurry is kept at a temperature not lower than 70.degree. C., adding sulfuric acid or hydrochloric acid to the slurry to make the pH below 3, blowing air or nitrogen gas into the slurry in the reactor container, withdrawing from the container CO.sub.2 and/or SO.sub.2 produced by reaction of CaCO.sub.3 and/or CaSO.sub.3 with the acid by entrainment with the air or nitrogen gas, and calculating the concentration of CaCO.sub.3 and/or CaSO.sub.3 from the concentration of CO.sub.2 and/or SO.sub.2 in the withdrawn gas, the flow rate of the sampled slurry and the flow rate of the blown air or nitrogen gas.

REFERENCES:
patent: 3459938 (1969-08-01), Stenger et al.
patent: 3801281 (1974-04-01), Thompson et al.
patent: 3854876 (1974-12-01), Rankine et al.
patent: 4046510 (1977-09-01), Becker et al.
patent: 4061467 (1977-12-01), Becker et al.
patent: 4063891 (1977-12-01), Becker et al.
patent: 4236960 (1980-12-01), Hultman et al.
patent: 4397957 (1983-08-01), Allison

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