Process for working up dusts which are produced in the electroth

Details Process for working up dusts which are produced in the electroth Process for working up dusts which are produced in the electroth

1989-07-26

1990-02-27

Doll, John

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423 37, 423 43, 423 92, 423101, 423309, 423313, 423315, 423323, C01B 1516, C01B 2526

Patent

active

049044591

ABSTRACT:
A process is provided for working up dusts which have been precipitated electrostatically from the gas mixture composed essentially of carbon monoxide and phosphorus vapor produced in the electrothermal production of yellow phosphorus, which process comprises converting the dusts into a calcinate at 300.degree. to 800.degree. C. under oxidizing conditions in a first step, leaching the calcinate with phosphoric acid in a second step, adjusting the pH of the solution in phosphoric acid to 0 to 1.5 with sodium hydroxide solution in a third step, precipitating the sulfides of lead, copper and cadmium from the partially neutralized solution in phosphoric acid by adding sulfide and filtering them off in a fourth step, adjusting the pH of the filtered, partially neutralized solution in phosphoric acid to about 1.5 to 5.0 with sodium hydroxide solution and precipitating zinc sulfide, if necessary by adding further quantities of sulfide, and filtering it off in a fifth step, further neutralizing the sodium phosphate solution, if necessary after expelling excess sulfide, with sodium hydroxide solution and separating it from precipitated calcium compounds in a sixth step, and using the resultant sodium phosphate solution in this form in a known manner to produce sodium phosphate salts.

REFERENCES:
patent: 1441573 (1923-01-01), Franchot et al.
patent: 2020976 (1935-11-01), Udy
patent: 2050796 (1936-08-01), Kerschbaum et al.
patent: 2069225 (1937-02-01), Curtis
patent: 2143001 (1939-01-01), Curtis et al.
patent: 2162657 (1939-06-01), Wehrstein
patent: 4299803 (1981-11-01), Schrodter et al.
patent: 4421521 (1983-12-01), Barber
patent: 4537756 (1985-08-01), Rottgen et al.
patent: 4762697 (1988-08-01), Nield et al.
patent: 4783328 (1988-11-01), Finley et al.

Affiliated with

Also associated with

Rating

Process for working up dusts which are produced in the electroth does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for working up dusts which are produced in the electroth, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for working up dusts which are produced in the electroth will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-172664