Acidolysis residue mineral powder recovery system

Abstract

The utility model discloses an acidolysis residue mineral powder recovery system which comprises a first residue washing plate-and-frame filter press, a feeding port of the first residue washing plate-and-frame filter press is connected with a waste residue slurry feeding pipe, and a discharging port of the first residue washing plate-and-frame filter press is connected with a small water feeding pipe and a filter residue feeding pipe. The small-degree water feeding pipe is communicated with the small-degree water tank, and the filter residue feeding pipe is communicated with the primary pulping tank; the magnetic separator is communicated with the primary pulping tank through a primary pulping discharge pipe; the waste residue transfer tank is communicated with the magnetic separator through a secondary filter pressing discharge pipe; the secondary pulping tank is communicated with the magnetic separator through a magnetic separator discharge pipe; and the slag washing plate-and-frame filter press II is communicated with the secondary pulping tank through a secondary pulping discharge pump and is communicated with the waste slag transfer tank through a secondary filter pressing feed pipe. Compared with the prior art, the acidolysis slag mineral powder recovery system has the advantages that resources are fully recovered, the whole circulating operation in a workshop can be effectively realized, the sewage treatment pressure is reduced, and the solid content in wastewater is reduced.

Description

Technical Field

[0001] This utility model relates to the field of chemical production technology, and in particular to an acid hydrolysis slag and mineral powder recovery system. Background Technology

[0002] The sulfuric acid process for titanium dioxide production is a mature method, with ilmenite or titanium slag as the main raw materials. Due to its lower production cost and readily available raw materials, the sulfuric acid process remains the primary method for titanium dioxide production. The acidolysis slag produced during the current sulfuric acid process contains recoverable un-acidified titanium. The main magnetically recoverable material is ilmenite with a magnetic susceptibility of 224.56~1173.33 (10⁻⁹ m³ / kg) and some compound titanium compounds with even lower magnetic susceptibility.

[0003] Acidification residue is generated during the sedimentation process of titanium liquid after acidification. The existing treatment method for the black residue is to recover the liquid soluble titanium through a filter press, and then slurry the black residue filter cake and send it to the wastewater treatment plant. The above treatment method has a low titanium ore recovery rate and cannot effectively recover the effective magnetic titanium ore in the black residue.

[0004] To address the aforementioned issues, this invention provides an acid leaching slag powder recovery system. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing an acid leaching slag powder recovery system.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A system for recovering acid leaching slag powder, the system comprising:

[0008] The first plate and frame filter press for washing slag has a waste slurry feed pipe connected to its inlet and a small water feed pipe and a filter residue feed pipe connected to its outlet. The small water feed pipe is connected to the small water tank and the filter residue feed pipe is connected to the primary pulping tank.

[0009] The magnetic separator is connected to the primary pulping tank through a primary pulping discharge pipe;

[0010] The waste transfer tank is connected to the magnetic separator via a secondary filter press discharge pipe.

[0011] The secondary pulping tank is connected to the magnetic separator via the magnetic separator's discharge pipe;

[0012] The second type of plate and frame filter press for washing slag is connected to the secondary pulping tank via a secondary pulping discharge pump and to the waste transfer tank via a secondary filter press feed pipe.

[0013] As a further improvement to this scheme, the number of slag washing plate and frame filter presses is set to 'a', where 'a' satisfies the quantity relationship a≥2; the slag washing plate and frame filter presses are connected in parallel.

[0014] As a further improvement to this scheme, at least two parallel primary slurry pumps are installed on the primary slurry discharge pipe of the primary slurry tank.

[0015] As a further improvement to this solution, the waste transfer tank is also connected to a waste transfer discharge pipe, and at least two parallel waste transfer tank pumps are installed on the waste transfer discharge pipe.

[0016] As a further improvement to this scheme, at least two parallel secondary pulping pumps are installed on the secondary pulping discharge pipe of the secondary pulping tank. The magnetic separator is also connected to a water inlet pipe, which is equipped with two parallel pipes, pipe one and pipe two. The water in pipe one comes from the process water pipeline, and the water in pipe two comes from the recycling water pipeline.

[0017] The acid hydrolysis slag powder recovery system of this utility model has the following beneficial effects:

[0018] 1) This acid hydrolysis slag and mineral powder recovery system first uses a magnetic separator to magnetically separate the re-pulping black slag before it is sent to the sewage treatment plant, in order to recover the effective magnetic titanium ore. After separation, the tailings are sent to the sewage treatment plant along the original route, and the concentrate is sent to the grinding process and returned to the system after plate and frame solid-liquid separation.

[0019] 2) Based on an annual titanium dioxide production capacity of 120,000 tons and an industry average of 250 kg of black slag per ton of titanium dioxide, the annual black slag processing capacity of this acid hydrolysis slag recovery system is estimated to be about 30,000 tons. This recovery system can separate titanium ore with a TiO2 content of more than 43% from the black slag, with a recovery yield of more than 10% (based on the acid hydrolysis rate). Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the acid hydrolysis slag and mineral powder recovery system of this utility model; Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Reference Figure 1 The present invention provides an acid hydrolysis slag and mineral powder recovery system.

[0023] Acid leaching slag powder recovery system, including

[0024] The filter press 201 is a plate and frame filter press for washing slag. The feed inlet of the filter press 201 is connected to the waste slurry feed pipe 1, and the discharge outlet of the filter press 201 is connected to the small water feed pipe 3 and the filter residue feed pipe 6. The small water feed pipe 3 is connected to the small water tank 4, and the filter residue feed pipe 6 is connected to the primary pulping tank 7.

[0025] Magnetic separator 10 is connected to primary pulping tank 7 via primary pulping discharge pipe 9;

[0026] Waste transfer tank 16 is connected to magnetic separator 10 through secondary filter press discharge pipe 13;

[0027] The secondary pulping tank 22 is connected to the magnetic separator 10 through the magnetic separator discharge pipe 12;

[0028] The slag washing plate and frame filter press 202 is connected to the secondary pulping tank 22 via a secondary pulping discharge pump, and to the waste slag transfer tank 16 via a secondary filter press feed pipe 14.

[0029] The acidolysis slag produced during the sulfuric acid process for titanium dioxide production contains recoverable un-acidified titanium, which is pumped to this acidolysis slag powder recovery system for processing.

[0030] First pressure filtration:

[0031] Waste residue is transported to the slurry feed pipe 1 to the slag washing plate and frame filter press 201 for filter pressing to produce filtrate and filter residue. The filtrate is transported to the small water tank 4 through the small water feed pipe 3, and the filter residue is transported to the primary pulping tank 7 through the filter residue feed pipe 6.

[0032] magnetic separation:

[0033] After pulping, the material is pumped to the magnetic separator in sequence 10 to separate titanium ore with a TiO2 content of more than 43%.

[0034] Second pressure filtration:

[0035] Titanium ore with a TiO2 content of more than 43% was sorted and placed into the secondary pulping tank 22. The remaining impurities and wastewater were transferred through the waste residue transfer tank in sequence 16 and finally sent to the wastewater treatment section.

[0036] After being pulped in the secondary pulping tank 22, the recovered titanium ore is pumped into the washing plate and frame filter press 202 to remove most of the water. After being filtered by the filter press, the solid is the recovered titanium ore and is sent to the ore silo, while the liquid is sent to the wastewater treatment section.

[0037] The number of plate and frame filter presses 201 for washing slag is set to a, where a satisfies the quantity relationship a≥2; the plate and frame filter presses 201 for washing slag are connected in parallel.

[0038] At least two primary pulping pumps are installed in parallel on the primary pulping discharge pipe 9 of the primary pulping tank 7. The installation of at least two pumps in parallel ensures that if one fails, the other can continue operating, preventing production disruptions due to a malfunction.

[0039] The waste transfer trough 16 is also connected to a waste transfer discharge pipe 18, and at least two waste transfer trough pumps 20 are installed in parallel on the waste transfer discharge pipe 18. The installation of at least two parallel slurry pumps is to ensure that if one fails, the other can continue operating, preventing production disruptions due to a malfunction.

[0040] At least two parallel secondary pulping pumps 21 are installed on the secondary pulping discharge pipe 15 of the secondary pulping tank 22. The installation of at least two parallel pulping pumps ensures that if one fails, the other can continue operating, preventing production disruptions due to a malfunction.

[0041] The magnetic separator 10 is also connected to a water inlet pipe 11, which is equipped with parallel pipes 111 and 112. The water in pipe 111 comes from the process water pipeline, and the water in pipe 112 comes from the recycling water pipeline. Through the arrangement of pipes 111 and 112, the water in the process water pipeline and the recycling water can enter the acid hydrolysis slag ore powder recovery system for recycling.

[0042] Specific working principle:

[0043] The main equipment of the acid hydrolysis slag powder recovery system includes a slag washing plate and frame filter press 1 (201), a slag washing plate and frame filter press 2 (202), a small water tank 4, a primary pulping tank 7, a magnetic separator 10, a waste slag transfer tank 16, and a secondary pulping tank 22.

[0044] The acidolysis slag produced during the sulfuric acid process for titanium dioxide production contains recoverable un-acidified titanium. This slag is pumped via slurry pumps A / B to a plate and frame filter press 201 for filtration. The filtrate and filter cake are produced. The filtrate is retained in a small-scale water tank 4 and pumped back to the acidolysis tank for use as leaching water via a small-scale water outlet pipe 17. The filter cake (containing insoluble titanium that has not undergone acidolysis) is placed in a primary pulping tank 7 for pulping. After pulping, it is pumped to a magnetic separator 10, where titanium ore with a TiO2 content of 43% or higher is separated and placed in a secondary pulping tank 22. The remaining impurities and wastewater are transferred via a waste transfer tank 16 and finally sent to the wastewater treatment section.

[0045] After being pulped in the secondary pulping tank 22, the recovered titanium ore is pumped into the washing plate and frame filter press 202 to remove most of the water. After being filtered by the washing plate and frame filter press 202, the solid is the recovered titanium ore and is sent to the ore dam, while the liquid is sent to the wastewater treatment section.

[0046] This acid hydrolysis slag and mineral powder recovery system first uses a magnetic separator to magnetically separate the re-pulping black slag before it is transported to the sewage treatment plant, in order to recover the effective magnetic titanium ore. After separation, the tailings are transported to the sewage treatment plant along the original route, and the concentrate is transported to the grinding process and returned to the system after plate and frame solid-liquid separation.

[0047] Based on an annual titanium dioxide production capacity of 120,000 tons and an industry average of 250 kg of black slag per ton of titanium dioxide, this acid hydrolysis slag recovery system requires the processing of approximately 30,000 tons of black slag annually. The magnetic separation in this recovery system can separate titanium ore with a TiO2 content of over 43% from the black slag, with a recovery yield of over 10% (based on the acid hydrolysis rate).

[0048] The overall circuit design of this acid hydrolysis slag and mineral powder recovery system reduces the pressure on wastewater treatment and decreases the solid content in wastewater.

[0049] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A system for recovering acid leaching slag powder, characterized in that, The acid hydrolysis slag powder recovery system includes: The feed inlet of the slag washing plate and frame filter press (201) is connected to the waste residue slurry feed pipe (1), and the discharge outlet of the slag washing plate and frame filter press (201) is connected to the small-degree water feed pipe (3) and the filter residue feed pipe (6). The small-degree water feed pipe (3) is connected to the small-degree water tank (4), and the filter residue feed pipe (6) is connected to the primary pulping tank (7). Magnetic separator (10), the magnetic separator (10) is connected to the primary pulping tank (7) through the primary pulping discharge pipe (9); Waste residue transfer tank (16), the waste residue transfer tank (16) is connected to the magnetic separator (10) through the secondary filter press discharge pipe (13); The secondary pulping tank (22) is connected to the magnetic separator (10) through the magnetic separator discharge pipe (12); The second plate and frame filter press (202) is connected to the secondary pulping tank (22) via a secondary pulping discharge pump and to the waste transfer tank (16) via a secondary filter press feed pipe (14).

2. The acid leaching slag powder recovery system according to claim 1, characterized in that, The quantity of the slag washing plate and frame filter press (201) is set to a, where a satisfies the quantity relationship a≥2; The plate and frame filter presses for washing residue (201) are connected in parallel.

3. The acid leaching slag powder recovery system according to claim 1, characterized in that, At least two parallel primary slurry pumps are installed on the primary slurry discharge pipe (9) of the primary slurry tank (7).

4. The acid leaching slag powder recovery system according to claim 1, characterized in that, The waste transfer tank (16) is also connected to a waste transfer discharge pipe (18), and at least two parallel waste transfer tank pumps (20) are installed on the waste transfer discharge pipe (18).

5. The acid leaching slag powder recovery system according to claim 1, characterized in that, At least two parallel secondary pulping pumps (21) are installed on the secondary pulping discharge pipe (15) of the secondary pulping tank (22).

6. The acid leaching slag powder recovery system according to claim 1, characterized in that, The magnetic separator (10) is also connected to a water inlet pipe (11). The water inlet pipe (11) is equipped with two parallel pipes, namely pipe one (111) and pipe two (112). The water in pipe one (111) comes from the process water pipe, and the water in pipe two (112) comes from the recycling water pipe.

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