System for purifying industrial precipitated barium sulfate by using wet-process barium phosphate slag

Abstract

A system for purifying industrial precipitated barium sulfate by using wet-process barium phosphate slag comprises a barium sulfate slag conveying pipeline, the barium sulfate slag conveying pipeline is connected with a feed port of a raw material chain crusher, a discharge port of the raw material chain crusher is connected with a feed port of a 1 # ammonia washing tank through a 1 # belt conveyor, a discharge port of the 1 # ammonia washing tank is connected with a feed port of a 1 # plate-and-frame filter, and a discharge port of the 1 # plate-and-frame filter is connected with a feed port of a 2 # plate-and-frame filter. A filtered solid outlet of the 1 # plate-and-frame filter is connected with a feeding port of the rinsing bath through a 2 # belt conveyor, a solid discharging port in the bottom of the rinsing bath is connected with a feeding port of the 3 # plate-and-frame filter, a filtered solid outlet of the 3 # plate-and-frame filter is connected with a feeding port of the fluidized bed through a 4 # belt conveyor, and a discharging port of the fluidized bed is connected with a feeding port of the barium sulfate mill. And a discharge hole of the barium sulfate mill is connected with a feeding hole of the barium sulfate packaging machine. The system has the beneficial effects that waste recycling is realized; the recovery of the phosphorus element in the wet-process barium sulfate phosphate slag is realized; the system ammonia consumption is low; and the system is high in environmental protection property and zero in sewage discharge.

Description

Technical Field

[0001] The utility model belongs to the technical field of chemical waste recycling, and in particular relates to a system for purifying industrial precipitated barium sulfate by utilizing wet-process barium phosphate slag. Background Art

[0002] Barium sulfate is an important chemical raw material, mainly used as a raw material or filler for paints, inks, plastics, advertising pigments, cosmetics, and batteries. It is also used in ceramics, enamels, dyes and other industries, and is also a raw material for the preparation of other barium salts. In nature, barium sulfate mainly exists in mineral resources in the form of barite. Industrially produced precipitated barium sulfate is generally a white amorphous powder with a relative density of 4.5 and a melting point of 1580°C. It is difficult to dissolve in water, ethanol and acid.

[0003] In the desulfurization process of our company's refined wet-process phosphoric acid, barium sulfate precipitate is generated when barium carbonate is used to remove sulfate ions. Because the barium sulfate precipitate is too fine and difficult to purify and recycle, the by-product barium sulfate is currently treated as industrial waste slag and discharged to the phosphogypsum yard. The main components of by-product barium sulfate are barium sulfate, phosphoric acid and other impurities. The 100,000 tons / year refined acid unit produces about 1,500 tons of barium sulfate slag per year. If the by-product barium sulfate slag cannot be recovered in a timely and effective manner, it will not only cause a waste of resources but also require the barium slag to be piled up in the yard. In order to solve the problem of recycling refined barium phosphate slag and realize the recycling of phosphorus resources at the same time, a system for purifying industrial precipitated barium sulfate using wet-process barium phosphate slag is designed to solve the problems in production. Summary of the invention

[0004] In view of the above technical problems, the utility model proposes a system for purifying industrial precipitated barium sulfate by wet-process barium phosphate slag, and its technical scheme is: a system for purifying industrial precipitated barium sulfate by wet-process barium phosphate slag, comprising a pipeline for conveying barium sulfate slag, the pipeline for conveying barium sulfate slag is connected to the feed port of a raw material chain crusher, the discharge port of the raw material chain crusher is connected to the feed port of a 1# ammonia washing tank through a 1# belt conveyor, the discharge port of the 1# ammonia washing tank is connected to the feed port of a 1# plate and frame filter, the filter solid outlet of the 1# plate and frame filter is connected to the feed port of a water washing tank through a 2# belt conveyor, the bottom solid discharge port of the water washing tank is connected to the feed port of a 3# plate and frame filter, the filter solid outlet of the 3# plate and frame filter is connected to the feed port of a fluidized bed through a 4# belt conveyor, the discharge port of the fluidized bed is connected to the feed port of a barium sulfate mill, and the discharge port of the barium sulfate mill is connected to the loading port of a barium sulfate packaging machine.

[0005] As a preferred embodiment, the filter solid outlet of the 1# plate and frame filter is connected to the feed port of the 2# ammonia washing tank through the 2# belt conveyor, the discharge port of the 2# ammonia washing tank is connected to the feed port of the 2# plate and frame filter, the filter solid outlet of the 2# plate and frame filter is connected to the feed port of the water washing tank through the 3# belt conveyor, the bottom solid discharge port of the water washing tank is connected to the feed port of the 3# plate and frame filter, the filter solid outlet of the 3# plate and frame filter is connected to the feed port of the fluidized bed through the 4# belt conveyor, the discharge port of the fluidized bed is connected to the feed port of the barium sulfate mill, and the discharge port of the barium sulfate mill is connected to the loading port of the barium sulfate packaging machine.

[0006] As a preferred embodiment, the discharge port of the barium sulfate mill is connected to the feed port of the barium sulfate silo, and the discharge port of the barium sulfate silo is connected to the feed port of the barium sulfate packaging machine.

[0007] As a preferred solution, the filtrate outlet of the 1# plate and frame filter is connected to the feed inlet of the 1# ammonia washing tank.

[0008] As a preferred solution, the filtrate outlet of the 2# plate and frame filter is connected to the feed inlet of the 2# ammonia washing tank.

[0009] As a preferred embodiment, the lower and middle liquid outlet of the washing tank is connected to the phosphate ammonium device.

[0010] Beneficial effects of the utility model:

[0011] (1) Realize waste recycling, and use the barium sulfate slag, the intermediate waste of wet phosphoric acid, to obtain industrial precipitated barium sulfate products through purification;

[0012] (2) To realize the recovery of phosphorus in barium sulfate slag from wet phosphoric acid. After the barium sulfate slag is washed twice with ammonia and once with water, the phosphorus in the barium sulfate slag is neutralized with ammonia to produce ammonium phosphate, which is then returned to the ammonium phosphate device;

[0013] (3) The system has low ammonia consumption. The filtrate from the 1# plate and frame filter enters the 1# ammonia washing tank for recycling, and the filtrate from the 2# plate and frame filter enters the 2# ammonia washing tank for recycling;

[0014] (4) The system is highly environmentally friendly and has zero wastewater discharge. The phosphate ammonium water in the washing tank returns to the phosphate ammonium device. This system has zero wastewater discharge. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0016] In the figure: 1. Raw material chain crusher; 2. 1# belt conveyor; 3. 1# ammonia washing tank; 4. 1# plate and frame filter; 5. 2# belt conveyor; 6. 2# ammonia washing tank; 7. 2# plate and frame filter; 8. 3# belt conveyor; 9. Water washing tank; 10. 3# plate and frame filter; 11. 4# belt conveyor; 12. Fluidized bed; 13. Barium sulfate mill; 14. Barium sulfate silo; 15. Barium sulfate packaging machine; 16. Ammonium phosphate device. DETAILED DESCRIPTION

[0017] The utility model is further described in detail below based on the accompanying drawings and specific embodiments.

[0018] Example 1

[0019] A system for purifying industrial precipitated barium sulfate by using wet-process barium phosphate slag, comprising a pipeline for conveying barium sulfate slag, the pipeline for conveying barium sulfate slag is connected to the feed port of a raw material chain crusher 1, the discharge port of the raw material chain crusher 1 is connected to the feed port of a 1# ammonia washing tank 3 through a 1# belt conveyor 2, the discharge port of the 1# ammonia washing tank 3 is connected to the feed port of a 1# plate-frame filter 4, the filtered solid outlet of the 1# plate-frame filter 4 is connected to the feed port of a 2# ammonia washing tank 6 through a 2# belt conveyor 5, and the filtered solid outlet of the 1# plate-frame filter 4 is connected to the feed port of a 2# ammonia washing tank 6 through a 2# belt conveyor 5. Then, the discharge port of the 2# ammonia washing tank 6 is connected to the feed port of the 2# plate and frame filter 7, the filtered solid outlet of the 2# plate and frame filter 7 is connected to the feed port of the water washing tank 9 through the 3# belt conveyor 8, the bottom solid discharge port of the water washing tank 9 is connected to the feed port of the 3# plate and frame filter 10, the filtered solid outlet of the 3# plate and frame filter 10 is connected to the feed port of the fluidized bed 12 through the 4# belt conveyor 11, the discharge port of the fluidized bed 12 is connected to the feed port of the barium sulfate mill 13, the discharge port of the barium sulfate mill 13 is connected to the feed port of the barium sulfate silo 14, and the discharge port of the barium sulfate silo 14 is connected to the loading port of the barium sulfate packaging machine 15.

[0020] Furthermore, the filtrate outlet of the 1# plate and frame filter 4 is connected to the feed inlet of the 1# ammonia washing tank 3 .

[0021] Furthermore, the filtrate outlet of the 2# plate and frame filter 7 is connected to the feed inlet of the 2# ammonia washing tank 6 .

[0022] Furthermore, the lower and middle liquid outlet of the washing tank 9 is connected to the phosphate ammonium device 16.

[0023] The operation process of the system is as follows: barium sulfate slag enters the raw material chain crusher 1 through the barium sulfate slag pipeline, and after being crushed, it is transported to the 1# ammonia washing tank 3 through the 1# belt conveyor 2 for ammonia washing, and then enters the 1# plate and frame filter 4 for filtration, and the filtrate returns to the 1# ammonia washing tank 3 for recycling, and the filtered solid is transported to the 2# ammonia washing tank 6 through the 2# belt conveyor 5 for secondary ammonia washing, and then enters the 2# plate and frame filter 7 for secondary filtration, and the filtrate returns to the 2# ammonia washing tank 6 for recycling, and the filtered solid is transported to the water washing tank 9 through the 3# belt conveyor for water washing to wash away the phosphorus element in the barium sulfate slag, and the water washing liquid is transported to the ammonium phosphate device 16, and the solid enters the 3# plate and frame filter 10, and the filtered solid is transported to the fluidized bed 12 through the 4# belt conveyor 11 for drying, and the dried barium sulfate enters the barium sulfate grinder 13, and the ground barium sulfate enters the barium sulfate silo 14, and after passing through the barium sulfate packaging machine 15, the barium sulfate product is obtained.

[0024] Example 2

[0025] A system for purifying industrial precipitated barium sulfate by using wet-process barium phosphate slag comprises a pipeline for conveying barium sulfate slag, the pipeline for conveying barium sulfate slag is connected to the feed port of a raw material chain crusher 1, the discharge port of the raw material chain crusher 1 is connected to the feed port of a 1# ammonia washing tank 3 through a 1# belt conveyor 2, the discharge port of the 1# ammonia washing tank 3 is connected to the feed port of a 1# plate-frame filter 4, the filtered solid outlet of the 1# plate-frame filter 4 is connected to the feed port of a water washing tank 9 through a 2# belt conveyor 5, the bottom solid discharge port of the water washing tank 9 is connected to the feed port of a 3# plate-frame filter 10, the filtered solid outlet of the 3# plate-frame filter 10 is connected to the feed port of a fluidized bed 12 through a 4# belt conveyor 11, the discharge port of the fluidized bed 12 is connected to the feed port of a barium sulfate mill 13, the discharge port of the barium sulfate mill 13 is connected to the feed port of a barium sulfate silo 14, and the discharge port of the barium sulfate silo 14 is connected to the loading port of a barium sulfate packaging machine 15.

[0026] Furthermore, the filtrate outlet of the 1# plate and frame filter 4 is connected to the feed inlet of the 1# ammonia washing tank 3 .

[0027] Furthermore, the lower and middle liquid outlet of the washing tank 9 is connected to the phosphate ammonium device 16.

[0028] The operation process of the system is as follows: barium sulfate slag enters the raw material chain crusher 1 through the barium sulfate slag pipeline, and after being crushed, it is transported to the 1# ammonia washing tank 3 for ammonia washing through the 1# belt conveyor 2, and then enters the 1# plate and frame filter 4 for filtration, and the filtrate returns to the 1# ammonia washing tank 3 for recycling, and the filtered solid is transported to the water washing tank 9 for water washing through the 3# belt conveyor to wash away the phosphorus element in the barium sulfate slag, and the water washing liquid is transported to the ammonium phosphate device 16, and the solid enters the 3# plate and frame filter 10, and the filtered solid is transported to the fluidized bed 12 for drying through the 4# belt conveyor 11, and the dried barium sulfate enters the barium sulfate grinder 13, and the ground barium sulfate enters the barium sulfate silo 14, and after passing through the barium sulfate packaging machine 15, the barium sulfate product is obtained.

Claims

1. A system for purifying industrial precipitated barium sulfate using wet-process barium phosphate slag, characterized in that: The invention comprises a pipeline for conveying barium sulfate slag, the pipeline for conveying barium sulfate slag is connected to the feed port of a raw material chain crusher (1), the discharge port of the raw material chain crusher (1) is connected to the feed port of a #1 ammonia washing tank (3) through a #1 belt conveyor (2), the discharge port of the #1 ammonia washing tank (3) is connected to the feed port of a #1 plate-frame filter (4), the filtered solid outlet of the #1 plate-frame filter (4) is connected to the feed port of a #2 ammonia washing tank (6) through a #2 belt conveyor (5), the discharge port of the #2 ammonia washing tank (6) is connected to the feed port of a #2 plate-frame filter (7) The solids outlet of the 2# plate and frame filter (7) is connected to the feed port of the water washing tank (9) through the 3# belt conveyor (8), the solids outlet at the bottom of the water washing tank (9) is connected to the feed port of the 3# plate and frame filter (10), the solids outlet of the 3# plate and frame filter (10) is connected to the feed port of the fluidized bed (12) through the 4# belt conveyor (11), the discharge port of the fluidized bed (12) is connected to the feed port of the barium sulfate mill (13), and the discharge port of the barium sulfate mill (13) is connected to the loading port of the barium sulfate packaging machine (15).

2. A system for purifying industrial precipitated barium sulfate using wet-process barium phosphate slag according to claim 1, characterized in that: The discharge port of the barium sulfate mill (13) is connected to the feed port of the barium sulfate silo (14), and the discharge port of the barium sulfate silo (14) is connected to the feed port of the barium sulfate packaging machine (15).

3. A system for purifying industrial precipitated barium sulfate using wet-process barium phosphate slag according to claim 1, characterized in that: The filtrate outlet of the 1# plate and frame filter (4) is connected to the feed inlet of the 1# ammonia washing tank (3).

4. A system for purifying industrial precipitated barium sulfate using wet-process barium phosphate slag according to claim 2, characterized in that: The filtrate outlet of the 2# plate and frame filter (7) is connected to the feed inlet of the 2# ammonia washing tank (6).

5. A system for purifying industrial precipitated barium sulfate using wet-process barium phosphate slag according to claim 1, characterized in that: The liquid outlet at the middle and lower part of the water washing tank (9) is connected to the ammonium phosphate device (16).

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