Claims
- 1. A process for the production of fluid fertilizer comprising the steps of:
- (a) smelting phosphatic minerals with coke and silica rock in a submerged arc electric furnace, wherein a phosphorus containing gas is evolved from the furnace;
- (b) cleaning said gas in an electrostatic precipitator;
- (c) condensing phosphorus from said gas by cooling of the gas by direct contact of the gas with water;
- (d) continuously recirculating said water to the condensing step and bleeding off the water at the rate of about 5 gpm per 100 tons of phosphorus produced per day, such liquid containing ppm of elemenetal phosphorus of the order of 1700 ppm;
- (e) subjecting the bled water from step (d) to a clarifier with about 98 percent of the feed liquid recovered as clarified overflow and about 2 percent recovered as underflow, with about 120 ppm of elemental phosphorus in the overflow;
- (f) treating the clarifier overflow in a centrifuge to remove additional suspended phosphorus and obtain water with about 12 ppm of elemental phosphorus;
- (g) adding the clarified and centrifuged water to fluid fertilizer processes for cooling or dissolution of fertilizer solids, wherein:
- the step (g) adding the water to fluid fertilizer processes includes three stage ammoniation using three ammoniators in series, comprising the steps of:
- (1) placing the clarified water from the centrifuge in the first two ammoniators, one of which is equipped with an evaporative cooler;
- (2) adding phosphoric acid to the first stage ammoniator;
- (3) adding a suspending clay to the third ammoniator; and
- (4) agitating with ammonia in all three ammoniators, to produce as a product 13-38-0 orthophosphate base suspension fertilizer.
- 2. A process for the production of fluid fertilizer comprising the steps of:
- (a) smelting phosphatic minerals with coke and silica rock in a submerged arc electric furnace, wherein a phosphorus containing gas is evolved from the furnace;
- (b) cleaning said gas in an electrostatic precipitator;
- (c) condensing phosphorus from said gas by cooling of the gas by direct contact of the gas with water;
- (d) continuously recirculating said water to the condensing step and bleeding off the water at the rate of about 5 gpm per 100 tons of phosphorus produced per day, such liquid containing ppm of elemental phosphorus of the order of 1700 ppm;
- (e) subjecting the bled water from step (d) to a clarifier with about 98 percent of the feed liquid recovered as clarified overflow and about 2 percent recovered as underflow, with about 120 ppm of elemental phosphorus in the overflow;
- (f) treating the clarifier overflow in a centrifuge to remove additional suspended phosphorus and obtain water with about 12 ppm of elemental phosphorus;
- (g) adding the clarified and centrifuged water to fluid fertilizer processes for cooling or dissolution of fertilizer solids; wherein:
- the step (g) adding the water to fluid fertilizer processes includes two stage ammoniation using two ammoniators in series, comprising the steps of:
- (1) placing the clarified water from the centrifuge in the two ammoniators, the first of which is equipped with an evaporative cooler;
- (2) adding phosphoric acid to the first stage ammoniator;
- (3) adding a suspending clay to the fluid of the fluid fertilizer process;
- (4) agitating with ammonia in both ammoniators, to produce as a product 11-39-0 orthophosphate base suspension fertilizer.
Parent Case Info
This application is a divisional application of my copending application Ser. No. 223,122, filed Jan. 7, 1981, for ENERGY CONSERVATION AND POLLUTION ABATEMENT AT PHOSPHORUS FURNACES.
US Referenced Citations (13)
Non-Patent Literature Citations (2)
Entry |
Burt et al.; Production of Elemental Phosphorus by the Electric-Furnace Method; TVA Chem. Eng. Report #3; 1952; NFDC, Muscle Shoals, AL. |
Barber; Waste Effluent; Treatment and Reuse; Chemical Engineering Progress, vol. 65, No. 6; 6/1969, pp. 70-73. |
Divisions (1)
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Number |
Date |
Country |
Parent |
223122 |
Jan 1981 |
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