# US 10,864,493 B2 · Chemical phosphoric acid production unit provided with a phosphogypsum discharge system

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 10,864,493 B2
- Document ID: US10864493B2
- Status: Granted
- Kind: B2
- Application number: 16/467,397
- Filed: 2017-12-07
- Published: 2020-03-26
- Granted: 2020-12-15
- Earliest claimed: 2016-12-07
- Assignees: Ocp SA
- Applicants: Ocp SA
- Inventors: Abdelaziz El Hachmi
- Web page: https://patentgrep.com/patent/US10864493B2

## CPC

- B01J 4/007: {provided with moving parts}
- B07B 13/16: Feed or discharge arrangements
- B65G 65/00: Loading or unloading (of vehicles B65G67/00)
- C01B 25/18: Phosphoric acid
- C01F 11/46: Sulfates (dehydration of gypsum {for the production of calcium sulfate cements} C04B11/02)
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B07B: SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL (wet separating processes, sorting by processes using fluent material in the same way as liquid B03; combinations of dry separating apparatus with wet separating apparatus B03B; using liquids B03B, B03D; sorting by magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high voltage electric fields B03C; centrifuges or vortex apparatus for carrying out physical processes B04; hand sorting, postal sorting, sorting by switching or other devices actuated in response to detection or measurement of some feature of articles or samples of material B07C)
- B65G: TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS (packaging B65B; handling thin or filamentary materials, e.g. paper sheets or thread, B65H; cranes B66C; portable mobile or lifting or hauling appliances, e.g. hoists, B66D; devices for lifting or lowering goods for loading or unloading purposes, e.g. fork-lift trucks, B66F9/00; emptying bottles, jars, casks, barrels or similar containers, not otherwise provided for, B67C9/00; delivering or transferring liquids B67D; filling or discharging vessels for liquefied, solidified or compressed gases F17C; pipe-line systems for fluids F17D)
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}
- C01F: COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS (metal hydrides {monoborane, diborane or addition complexes thereof} C01B6/00; salts of oxyacids of halogens C01B11/00; peroxides, salts of peroxyacids C01B15/00; sulfides or polysulfides of magnesium, calcium, strontium, or barium C01B17/42; thiosulfates, dithionites, polythionates C01B17/64; compounds containing selenium or tellurium C01B19/00; binary compounds of nitrogen with metals C01B21/06; azides C01B21/08; {compounds other than ammonia or cyanogen containing nitrogen and non-metals and optionally metals C01B21/082; amides or imides of silicon C01B21/087}; metal {imides or} amides C01B21/092, {C01B21/0923}; nitrites C01B21/50; {compounds of noble gases C01B23/0005}; phosphides C01B25/08; salts of oxyacids of phosphorus C01B25/16; carbides C01B32/90; compounds containing silicon C01B33/00; compounds containing boron C01B35/00; compounds having molecular sieve properties but not having base-exchange properties C01B37/00; compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites, C01B39/00; cyanides C01C3/08; salts of cyanic acid C01C3/14; salts of cyanamide C01C3/16; thiocyanates C01C3/20; {double sulfates of magnesium with sodium or potassium C01D5/12; with other alkali metals C01D15/00, C01D17/00})

## Abstract

A chemical phosphoric acid production unit, comprising a reactor for the production of phosphoric acid; a receiving device for receiving phosphogypsum obtained after filtration of phosphoric acid produced in the reactor; and a discharge system for discharging phosphogypsum from the receiving device. The discharge system comprises a chute of which the inlet is located inside the receiving device and arranged communicate with the receiving device, and a flap moveable around an axis of rotation and configured to open according to a predetermined angle corresponding to a predetermined section for the passage of a fraction of phosphogypsum through the inlet of the chute, and to close in order to prevent the passage of phosphogypsum into the chute.

## Claims

### Claim 1

A method for discharging phosphogypsum from a device for receiving phosphogypsum, in a chemical phosphoric acid production unit comprising:
a reactor for the production of phosphoric acid,
a receiving device for receiving phosphogypsum obtained after filtration of phosphoric acid produced in the reactor,
a discharge system for discharging phosphogypsum from the receiving device,
the discharge system comprising:
a chute of which the inlet is located inside the receiving device and is arranged so as to communicate with said receiving device; and
a flap moveable around an axis of rotation, said flap being able to open according to a predetermined angle corresponding to a predetermined section for the passage of a fraction of phosphogypsum through the inlet of the chute, and to close in order to prevent the passage of phosphogypsum into the chute;
the method comprising:
a step of opening the flap accessing the chute according to a predetermined angle; and
a step of circulating a fraction of phosphogypsum from the receiving device into the chute.

### Claim 2 (depends on 1)

The method of claim 1, further comprising a step of transfer of the fraction of phosphogypsum from the chute to a duct, enabling the discharge of phosphogypsum from the chute.