Device and method for water spraying agglomeration-acid mixing curing of high-mud-content and high-binding-rate ore

Abstract

The invention provides a high-mud-content and high-binding-rate ore water spraying agglomeration-acid mixing curing device and method, and belongs to the technical field of hydrometallurgy. The device comprises a cylindrical stirrer, a feeding end, a clean water pump, a clean water nozzle, a sulfuric acid nozzle, a discharging end and a sulfuric acid pump, the two ends of the horizontal cylindrical stirrer are the feeding end and the discharging end respectively, and the clean water nozzle is arranged in the cylindrical stirrer close to the feeding end; and a sulfuric acid spray head is arranged in the middle and is connected with a sulfuric acid pump. During application, water is used as a medium, the flow of the water is adjusted, and the water is sprayed to the surface of ore flow, so that fine ore in the ore is adhered to the surface of lump ore for particle aggregation. Adding concentrated sulfuric acid for acid mixing treatment, and finally conveying to a storage yard through a conveying belt for standing and curing. According to the method, water is added into the ore for stirring, so that the ore is agglomerated, the seepage effect of leaching liquid on the surfaces of ore particles is improved, the leaching rate of the ore is increased, and the dump leaching operation obtains double benefits in the aspects of economy and efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of hydrometallurgy, in particular to a device and method for water spraying, agglomeration and acid mixing of high-mud-content and high-binding-rate ores. Background Art

[0002] In the heap leaching technology of high-binding rate oxide copper ore, concentrated acid maturation is a relatively advanced technology. It uses a high-concentration acid solution to change the physical and chemical structure of the ore and increase the leachability of copper minerals. The ore usually contains two forms: powder ore and lump ore. The powder ore has a fine particle size. When the ore is mixed with acid, the presence of the powder ore makes it difficult for concentrated sulfuric acid to quickly penetrate into the ore, affecting the rapid leaching of copper ions. This maturation process takes a long time, the copper leaching efficiency is low, and the mine operation cost also increases accordingly.

[0003] At present, conventional maturation schemes mainly rely on traditional stirring devices and simplified control systems, which are still powerless for high-mud and high-binding rate oxidized copper ores. The problem of low maturation leaching efficiency in the existing technology has not yet been solved.

[0004] Therefore, it is necessary to develop a simple, fast, safe and environmentally friendly device and method for water spraying agglomeration-acid mixing and maturation of high-mud and high-binding rate copper oxide ore. Summary of the invention

[0005] In order to solve the problem of low leaching efficiency of high-mud and high-binding rate copper oxide ore in the prior art, the present invention provides a device and method for spraying water agglomeration-mixing acid maturation of high-mud and high-binding rate ore. The technical solution is as follows:

[0006] A device for spraying water to aggregate and mix with acid for ore with high mud content and high binding rate, comprising a cylindrical mixer, a feed end, a clean water pump, a clean water nozzle, a sulfuric acid nozzle, a discharge end and a sulfuric acid pump.

[0007] The cylindrical mixer is a horizontal mixer, the angle between the axis of the cylindrical mixer and the horizontal plane is 1-3°, and the two ends of the cylindrical mixer are a feed end and a discharge end respectively;

[0008] A water nozzle is arranged near the feeding end of the cylindrical mixer, and a sulfuric acid nozzle is arranged in the middle section of the cylindrical mixer;

[0009] The clean water nozzle is connected to the clean water pump, and a flow regulating valve is arranged at the inlet of the clean water pump;

[0010] The sulfuric acid nozzle is connected to a sulfuric acid pump, and a sulfuric acid regulating valve is arranged at the inlet of the sulfuric acid pump.

[0011] The specifications of the cylindrical mixer are (3.0~5.5) (9~27)m.

[0012] The discharging end is connected to a transport belt.

[0013] The distance between the clean water nozzle and the feed end is 1-3 m, and the distance between the top of the clean water nozzle and the inner wall of the top of the cylindrical mixer is 0.5-1.0 m;

[0014] The clean water nozzles are arranged in 4 to 6 rows, with a spacing of 0.3 to 0.6 m between each row, 6 to 8 nozzles are arranged in each row, and the spacing between nozzles in the same row is 0.8 to 1.0 m;

[0015] The nozzle is a stainless steel low-pressure atomizing nozzle.

[0016] The sulfuric acid nozzle is 4-6m away from the feed end, and the top of the sulfuric acid nozzle is 0.5-1.0m away from the inner wall of the top of the cylindrical mixer;

[0017] The sulfuric acid nozzles are arranged in 2 to 3 rows, the spacing between each row is 0.5 to 1.0 m, 2 to 3 nozzles are arranged in each row, and the spacing between nozzles in the same row is 2.0 to 3.0 m;

[0018] The nozzle is a stainless steel low-pressure atomizing nozzle.

[0019] The application method of the device comprises the following steps:

[0020] S1. The ore enters the cylindrical mixer from the feed end, the clean water pump and flow regulating valve are turned on, and clean water is sprayed into the ore through the clean water nozzle. The powder ore is adhered to the surface of the lump ore through stirring to agglomerate;

[0021] S2. When the ore moves backward in the cylindrical mixer, start the sulfuric acid pump and the sulfuric acid regulating valve, and spray industrial-grade concentrated sulfuric acid on the agglomerated ore through the sulfuric acid nozzle to mix the agglomerated ore and the concentrated sulfuric acid evenly;

[0022] S3. The agglomerated and acid-mixed ore enters the conveyor belt through the discharge end and is transported to the stockpile for static maturation.

[0023] The ore is copper oxide ore, the ore particle size of -1 mm accounts for 41% to 53%, and the content of combined copper oxide in the copper oxide ore accounts for 20% to 60% of the total copper.

[0024] In step S1, the feed rate of ore is 400-450 t / h; the clean water flow rate is 27-36 t / h.

[0025] In step S2, the rotation speed of the cylindrical mixer is 4-8 rpm; the flow rate of industrial-grade concentrated sulfuric acid is 1.8-3.6 t / h.

[0026] The beneficial effects brought about by the technical solution provided by the embodiment of the present invention include at least:

[0027] The above scheme transforms the drum mixer to have the dual functions of agglomeration and acid mixing at the same time. By adding water to the ore and stirring it, the powder ore adheres to the surface of the lump ore, making the ore agglomerates uniform and larger, and improving the penetration characteristics of the leaching liquid in the ore pile. The concentrated acid aging process can significantly improve the leaching efficiency of copper ions, thereby ensuring the high efficiency and economy of leaching of difficult-to-treat oxide copper ore.

[0028] The device and method of the present invention can promote the ore maturation and leaching efficiency. The process design of ore water spraying agglomeration-acid mixing maturation is simple and efficient, easy to operate and maintain, and has good application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 This is a schematic diagram of the structure of the device for spraying water, agglomerating and mixing with acid for ore with high mud content and high binding rate according to the present invention;

[0031] Figure 2 It is a cross-sectional view of a cylindrical mixer in a device for spraying water to agglomerate and mix with acid for aging of ore with high mud content and high binding rate according to the present invention;

[0032] Figure 3 It is a top view of the device for water spraying agglomeration-acid mixing and maturation of high-mud-content and high-binding rate ores according to the present invention.

[0033] Among them: 1-feeding end, 2-clean water pump, 3-flow regulating valve, 4-clean water nozzle, 5-cylinder mixer, 6-sulfuric acid nozzle, 7-discharging end, 8-transport belt, 9-sulfuric acid pump, 10-sulfuric acid regulating valve. DETAILED DESCRIPTION

[0034] The technical solution of the present invention is described below in conjunction with the accompanying drawings.

[0035] In the embodiments of the present invention, words such as "exemplarily" and "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design described as "example" in the present invention should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of the word "example" is intended to present the concept in a specific way. In addition, in the embodiments of the present invention, the meaning expressed by "and / or" can be both, or it can be either of the two.

[0036] In order to make the technical problems, technical solutions and advantages to be solved by the present invention more clear, a detailed description will be given below with reference to the accompanying drawings and specific embodiments.

[0037] The embodiment of the present invention provides a device and method for water spraying, agglomeration and acid mixing of high-mud-content and high-binding rate ores.

[0038] like Figure 1 and Figure 3 As shown, the device includes a cylindrical mixer 5, a feed end 1, a clean water pump 2, a clean water nozzle 3, a sulfuric acid nozzle 6, a discharge end 7 and a sulfuric acid pump 9.

[0039] The cylindrical mixer 5 is a horizontal mixer, the angle between the axis of the cylindrical mixer and the horizontal plane is 1-3°, and the two ends of the cylindrical mixer are a feed end 1 and a discharge end 7 respectively;

[0040] A water nozzle 4 is arranged near the feeding end of the cylindrical mixer 5, and a sulfuric acid nozzle 6 is arranged in the middle section of the cylindrical mixer 5;

[0041] The clean water nozzle 4 is connected to the clean water pump 2, and a flow regulating valve 3 is arranged at the inlet of the clean water pump 2;

[0042] The sulfuric acid nozzle 6 is connected to a sulfuric acid pump 9 , and a sulfuric acid regulating valve 10 is arranged at the inlet of the sulfuric acid pump 9 .

[0043] like Figure 2 The distance between the clean water nozzle and the feed end is 1-3m, and the distance between the top of the clean water nozzle and the inner wall of the top of the cylindrical mixer is 0.5-1.0m;

[0044] The clean water nozzles are arranged in 4 to 6 rows, with a spacing of 0.3 to 0.6 m between each row, 6 to 8 nozzles are arranged in each row, and the spacing between nozzles in the same row is 0.8 to 1.0 m;

[0045] The nozzle is a stainless steel low-pressure atomizing nozzle.

[0046] The sulfuric acid nozzle is 4-6m away from the feed end, and the top of the sulfuric acid nozzle is 0.5-1.0m away from the inner wall of the top of the cylindrical mixer;

[0047] The sulfuric acid nozzles are arranged in 2 to 3 rows, the spacing between each row is 0.5 to 1.0 m, 2 to 3 nozzles are arranged in each row, and the spacing between nozzles in the same row is 2.0 to 3.0 m;

[0048] The nozzle is a stainless steel low-pressure atomizing nozzle.

[0049] The application method of the device comprises the following steps:

[0050] S1. The ore enters the cylindrical mixer from the feed end, the clean water pump and flow regulating valve are turned on, and clean water is sprayed into the ore through the clean water nozzle. The powder ore is adhered to the surface of the lump ore through stirring to agglomerate;

[0051] S2. When the ore moves backward in the cylindrical mixer, start the sulfuric acid pump and the sulfuric acid regulating valve, and spray industrial-grade concentrated sulfuric acid on the agglomerated ore through the sulfuric acid nozzle to mix the agglomerated ore and the concentrated sulfuric acid evenly;

[0052] S3. The agglomerated and acid-mixed ore enters the conveyor belt through the discharge end and is transported to the stockpile for static maturation.

[0053] This will be described below with reference to specific embodiments.

[0054] The ore size of the Mulyashi wet process plant is between 0 and 50 mm, but -1 mm accounts for 41% to 53%, which is a high-mud ore. There are few free-oxidized copper minerals, most of which are wrapped in limonite and biotite, accounting for 20% to 60% of the total copper, which is difficult to leach.

[0055] In the embodiment of the present invention, the device is used to add water to the mineral to aggregate and provide a copper ion seepage channel, and the sulfuric acid nozzle 6 device is used to accurately control the amount of acid input to ensure that the acid and ore react to release heat during the slaking process.

[0056] In this embodiment, the ore is first added to the drum mixer 5 through the feed end 1. The specifications of the drum mixer are 3.8m×12m, mixing time is 2-4 minutes, filling rate is 10~15%, rotation speed is 4-8rpm, inclination angle is 1º~3º, and equipment processing capacity is 400~500t / h. Then, the clean water pump 2 and flow control valve 3 are used to pressurize and control the flow rate, and the clean water is evenly sprayed on the ore through the clean water nozzle 4. The optimal water consumption for ore agglomeration is between 12% and 16%.

[0057] The agglomerated minerals are transported to the middle section of the drum mixer 5, and the amount of sulfuric acid is controlled by the sulfuric acid pump 9 and the sulfuric acid regulating valve 10. The sulfuric acid nozzle 6 starts to work, and 93% to 98% concentrated sulfuric acid is added to the drum mixer 5 in proportion. Finally, the matured ore is sent to the stockpile through the discharge end 7 through the conveyor belt 8. The unit consumption of acid for ore maturation is between 4 and 8 kg / t.

[0058] Through the above settings, it is ensured that the chemical reaction of the ore is uniform and efficient during the entire maturation process.

[0059] Before the technical solution of the present invention was adopted, the leaching rate of the ore in the wet process plant was between 58% and 63%. By adopting the above technical solution, the heap leaching rate of the wet process plant fluctuated between 61% and 73%. Accordingly, the acid consumption was reduced from the original 40-55kg / t to 23-35kg / t on site. It can be seen that after adopting the present invention, the heap leaching site of the wet process plant achieved good technical and economic indicators.

[0060] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A device for spraying water to aggregate and mix with acid for high mud content and high binding rate ore, characterized in that: It includes a cylindrical mixer, a feed end, a clean water pump, a clean water nozzle, a sulfuric acid nozzle, a discharge end and a sulfuric acid pump. The cylindrical mixer is a horizontal mixer, the angle between the axis of the cylindrical mixer and the horizontal plane is 1-3°, and the two ends of the cylindrical mixer are a feed end and a discharge end respectively; A water nozzle is arranged near the feeding end of the cylindrical mixer, and a sulfuric acid nozzle is arranged in the middle section of the cylindrical mixer; The clean water nozzle is connected to the clean water pump, and a flow regulating valve is arranged at the inlet of the clean water pump; The sulfuric acid nozzle is connected to a sulfuric acid pump, and a sulfuric acid regulating valve is arranged at the inlet of the sulfuric acid pump.

2. The device for water spraying agglomeration-acid mixing and maturation of high-mud-content and high-binding-rate ores according to claim 1 is characterized in that: The specifications of the cylindrical mixer are (3.0~5.5) (9~27)m.

3. The device for water spraying, agglomeration and acid mixing for high mud content and high binding rate ore according to claim 1 is characterized in that: The discharging end is connected to a transport belt.

4. The device for water spraying agglomeration-acid mixing and maturation of high-mud-content and high-binding-rate ores according to claim 1 is characterized in that: The distance between the clean water nozzle and the feed end is 1-3 m, and the distance between the top of the clean water nozzle and the inner wall of the top of the cylindrical mixer is 0.5-1.0 m; The clean water nozzles are arranged in 4 to 6 rows, with a spacing of 0.3 to 0.6 m between each row, 6 to 8 nozzles are arranged in each row, and the spacing between nozzles in the same row is 0.8 to 1.0 m; The nozzle is a stainless steel low-pressure atomizing nozzle.

5. The device for water spraying agglomeration-acid mixing and maturation of high-mud-content and high-binding-rate ores according to claim 1 is characterized in that: The sulfuric acid nozzle is 4-6m away from the feed end, and the top of the sulfuric acid nozzle is 0.5-1.0m away from the inner wall of the top of the cylindrical mixer; The sulfuric acid nozzles are arranged in 2 to 3 rows, the spacing between each row is 0.5 to 1.0 m, 2 to 3 nozzles are arranged in each row, and the spacing between nozzles in the same row is 2.0 to 3.0 m; The nozzle is a stainless steel low-pressure atomizing nozzle.

6. The application method of the device for spraying water, agglomerating and mixing acid for ore with high mud content and high binding rate according to claim 1 is characterized in that: The steps include: S1. The ore enters the cylindrical mixer from the feed end, the clean water pump and flow regulating valve are turned on, and clean water is sprayed into the ore through the clean water nozzle. The powder ore is adhered to the surface of the lump ore through stirring to agglomerate; S2. When the ore moves backward in the cylindrical mixer, start the sulfuric acid pump and the sulfuric acid regulating valve, and spray industrial-grade concentrated sulfuric acid on the agglomerated ore through the sulfuric acid nozzle to mix the agglomerated ore and the concentrated sulfuric acid evenly; S3. The agglomerated and acid-mixed ore enters the conveyor belt through the discharge end and is transported to the stockpile for static maturation.

7. The application method of the device for spraying water, agglomerating and mixing acid for ore with high mud content and high binding rate according to claim 6 is characterized in that: The ore is copper oxide ore, the ore particle size of -1 mm accounts for 41% to 53%, and the content of combined copper oxide in the copper oxide ore accounts for 20% to 60% of the total copper.

8. The application method of the device for spraying water, agglomerating and acidizing ore with high mud content and high binding rate according to claim 6 is characterized in that: In step S1, the feed rate of ore is 400-450 t / h; the clean water flow rate is 27-36 t / h.

9. The application method of the device for spraying water, agglomerating and acidizing ore with high mud content and high binding rate according to claim 6 is characterized in that: In step S2, the rotation speed of the cylindrical mixer is 4-8 rpm; the flow rate of industrial-grade concentrated sulfuric acid is 1.8-3.6 t / h.

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