A method for reducing the moisture content of ultrafine ilmenite filter cake

Abstract

The present application relates to the technical field of ore dressing, and particularly discloses a method for reducing the moisture of ultra-fine-grained ilmenite filter cake, which comprises the following steps: adding the ultra-fine-grained ilmenite concentrate obtained after flotation and a filtering aid into a stirring barrel for stirring, performing feed pressure filtration after the stirring is completed, and performing pressing after the feed is completed to obtain the filtrate. The present application can effectively improve the filtering production efficiency of the ultra-fine-grained ilmenite and reduce the moisture of the filter cake by adding the ultra-fine-grained ilmenite concentrate obtained after flotation and the filtering aid into the stirring barrel for stirring, performing feed pressure filtration after the stirring is completed, and performing pressing after the feed is completed to obtain the filtrate.

Description

Technical Field

[0001] This invention relates specifically to the field of mineral processing technology, and more specifically to a method for reducing the moisture content of ultrafine ilmenite filter cake. Background Technology

[0002] As concentrators in the Panxi region have raised their quality requirements for iron concentrate, the grinding particle size during the iron concentrate beneficiation and upgrading process has become increasingly fine. The iron tailings produced during iron concentrate beneficiation are also becoming increasingly fine. Currently, flotation recovery of this ultrafine ilmenite has begun. However, after flotation recovery of ultrafine ilmenite, the filter cake has a high moisture content.

[0003] Because ultrafine titanium concentrate slurry contains a large amount of ultrafine mud minerals, the mud minerals are particularly small in size and have a strong negative charge on their surface, making it difficult for the particles to aggregate. This makes the filtration of titanium concentrate difficult, reduces filtration efficiency, and the increase of fine mud minerals in the filtration water system can, in severe cases, worsen the production situation. Summary of the Invention

[0004] The purpose of this invention is to provide a method for reducing the moisture content of ultrafine ilmenite filter cake, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A method for reducing the moisture content of ultrafine ilmenite filter cake includes the following steps: adding ultrafine titanium concentrate obtained after flotation and a filter aid together to a mixing tank for stirring; after stirring, feeding and pressing are performed; and after feeding, pressing is performed to obtain the filtrate.

[0007] As a further aspect of the present invention, the stirring time is 5-10 minutes.

[0008] As a further embodiment of the present invention: the filter aid is a 7:3 mixture of sodium dodecyl sulfonate and ethyl oleate.

[0009] As a further embodiment of the present invention, the amount of the filter aid added is 200g / t-500g / t.

[0010] As a further embodiment of the present invention, the method for feeding and filtration after mixing is as follows: after mixing is completed, open the feed valve and slurry pump to feed and filter. When the feed pressure is stable, close the slurry pump and feed valve to end the feeding process.

[0011] As a further embodiment of the present invention, the feed pressure is 0.8 MPa to 1.6 MPa.

[0012] As a further aspect of the present invention, the pressing method is as follows: the pressing valve and the pressing pump are opened to press and obtain filtrate, and the pressing is ended when the filtrate meets the end criteria.

[0013] As a further embodiment of the present invention, the pressing pressure is 1.6 MPa to 2.6 MPa.

[0014] As a further aspect of the present invention, the termination criterion is: ≤30ml of filtrate flows out of the filter cloth within 30 seconds.

[0015] As a further aspect of the present invention: the filter cloth used during pressing is 621 filter cloth.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention adds the ultrafine titanium concentrate obtained after flotation and the filter aid together into a mixing tank for stirring. After stirring, the feed is pressed and filtered. After the feed is completed, the filtrate is obtained by pressing. This can effectively improve the production efficiency of ultrafine ilmenite filtration and reduce the moisture content of the filter cake. Attached Figure Description

[0017] Figure 1 A flowchart of a method for reducing the moisture content of ultrafine ilmenite filter cake. Detailed Implementation

[0018] The present application will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0019] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to specific examples and the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0020] It should be noted that all uses of "first" and "second" in the embodiments of the present invention are for the purpose of distinguishing two different entities or different parameters with the same name. Therefore, "first" and "second" are merely for convenience of expression and should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion, such as other steps or units inherent in a process, method, system, product, or device that includes a series of steps or units.

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

[0022] The flowchart shown in the attached diagram is for illustrative purposes only and does not necessarily include all content and operations / steps, nor does it necessarily have to be performed in the order described. For example, some operations / steps can be broken down, combined, or partially merged, so the actual execution order may change depending on the actual situation.

[0023] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0024] Because ultrafine titanium concentrate slurry contains a large amount of ultrafine mud minerals, the mud minerals are particularly small in size and have a strong negative charge on their surface, making it difficult for the particles to aggregate. This makes the filtration of titanium concentrate difficult, reduces filtration efficiency, and the increase of fine mud minerals in the filtration water system can, in severe cases, worsen the production situation.

[0025] Based on this, please refer to Figure 1 A method for reducing the moisture content of ultrafine ilmenite filter cake, comprising the following steps:

[0026] S10. Feed preparation: The ultrafine titanium concentrate obtained after flotation and the filter aid are added together into the mixing tank and stirred for 5-10 minutes. The filter aid is a 7:3 mixture of sodium dodecyl sulfonate and ethyl oleate, and the amount of filter aid added is 200g / t-500g / t.

[0027] S20. Feeding: After mixing is completed, open the feed valve and mortar pump to feed and filter. When the feed pressure is stable, close the mortar pump and feed valve to finish feeding. The feed pressure is 0.8 MPa - 1.6 MPa.

[0028] S30. Open the pressing valve and pressing pump, control the pressing pressure to 1.6MP-2.6MP, and wait until the filtrate flowing out of the filter cloth is ≤30ml after 30s to end the pressing. The filter cloth used during pressing is 621 filter cloth.

[0029] Example 1

[0030] In this embodiment of the invention, a method for reducing the moisture content of ultrafine ilmenite filter cake includes the following steps: Ultrafine titanium concentrate obtained after flotation and a filter aid are added together to a mixing tank and stirred for 5 minutes. The filter aid is a 7:3 mixture of sodium dodecyl sulfonate and ethyl oleate, with an addition amount of 200 g / t. After stirring, the feed valve and slurry pump are opened for feeding and filtration. When the feed pressure stabilizes, the slurry pump and feed valve are closed, and feeding is completed. The feed pressure is 0.8 MPa. The pressing valve and pressing pump are opened, and the pressing pressure is controlled at 1.6 MPa. Filtration is completed when ≤30 ml of filtrate flows out of the filter cloth within 30 seconds. 621 filter cloth is used during pressing.

[0031] Example 2

[0032] In this embodiment of the invention, a method for reducing the moisture content of ultrafine ilmenite filter cake includes the following steps: Ultrafine titanium concentrate obtained after flotation and a filter aid are added together to a mixing tank and stirred for 5 minutes. The filter aid is a 7:3 mixture of sodium dodecyl sulfonate and ethyl oleate, and the amount of filter aid added is 350 g / t. After stirring, the feed valve and slurry pump are opened for feeding and filtration. When the feed pressure stabilizes, the slurry pump and feed valve are closed, and feeding is completed. The feed pressure is 0.8 MPa. The pressing valve and pressing pump are opened, and the pressing pressure is controlled at 1.6 MPa. Filtration is completed when ≤30 ml of filtrate flows out of the filter cloth within 30 seconds. 621 filter cloth is used during pressing.

[0033] Example 3

[0034] In this embodiment of the invention, a method for reducing the moisture content of ultrafine ilmenite filter cake includes the following steps: Ultrafine titanium concentrate obtained after flotation and a filter aid are added together to a mixing tank and stirred for 5 minutes. The filter aid is a 7:3 mixture of sodium dodecyl sulfonate and ethyl oleate, with an addition amount of 500 g / t. After stirring, the feed valve and slurry pump are opened for feeding and filtration. When the feed pressure stabilizes, the slurry pump and feed valve are closed, and feeding is completed. The feed pressure is 0.8 MPa. The pressing valve and pressing pump are opened, and the pressing pressure is controlled at 1.6 MPa. Filtration is completed when ≤30 ml of filtrate flows out of the filter cloth within 30 seconds. 621 filter cloth is used during pressing.

[0035] Example 4

[0036] In this embodiment of the invention, a method for reducing the moisture content of ultrafine ilmenite filter cake includes the following steps: Ultrafine titanium concentrate obtained after flotation and a filter aid are added together to a mixing tank and stirred for 5 minutes. The filter aid is a 7:3 mixture of sodium dodecyl sulfonate and ethyl oleate, with an addition amount of 350 g / t. After stirring, the feed valve and slurry pump are opened for feeding and filtration. When the feed pressure stabilizes, the slurry pump and feed valve are closed, and feeding is completed. The feed pressure is 1.6 MPa. The pressing valve and pressing pump are opened, and the pressing pressure is controlled at 1.6 MPa. Filtration is completed when ≤30 ml of filtrate flows out of the filter cloth within 30 seconds. 621 filter cloth is used during pressing.

[0037] Example 5

[0038] In this embodiment of the invention, a method for reducing the moisture content of ultrafine ilmenite filter cake includes the following steps: Ultrafine titanium concentrate obtained after flotation and a filter aid are added together to a mixing tank and stirred for 5 minutes. The filter aid is a 7:3 mixture of sodium dodecyl sulfonate and ethyl oleate, with an addition amount of 500 g / t. After stirring, the feed valve and slurry pump are opened for feeding and filtration. When the feed pressure stabilizes, the slurry pump and feed valve are closed, and feeding is completed. The feed pressure is 1.6 MPa. The pressing valve and pressing pump are opened, and the pressing pressure is controlled at 2.0 MPa. Filtration is completed when ≤30 ml of filtrate flows out of the filter cloth within 30 seconds. 621 filter cloth is used during pressing.

[0039] Example 6

[0040] In this embodiment of the invention, a method for reducing the moisture content of ultrafine ilmenite filter cake includes the following steps: Ultrafine titanium concentrate obtained after flotation and a filter aid are added together to a mixing tank and stirred for 5 minutes. The filter aid is a 7:3 mixture of sodium dodecyl sulfonate and ethyl oleate, with an addition amount of 500 g / t. After stirring, the feed valve and slurry pump are opened for feeding and filtration. When the feed pressure stabilizes, the slurry pump and feed valve are closed, and feeding is completed. The feed pressure is 1.6 MPa. The pressing valve and pressing pump are opened, and the pressing pressure is controlled at 2.6 MPa. Filtration is completed when ≤30 ml of filtrate flows out of the filter cloth within 30 seconds. 621 filter cloth is used during pressing.

[0041] Comparative Example 1

[0042] A method for reducing the moisture content of ultrafine ilmenite filter cake includes the following steps: The ultrafine titanium concentrate obtained after flotation is added to a mixing tank and stirred for 5 minutes; after stirring, the feed valve and slurry pump are opened for feeding and filtration; when the feed pressure stabilizes, the slurry pump and feed valve are closed, and feeding is completed; the feed pressure is 0.8 MPa; the pressing valve and pressing pump are opened, and the pressing pressure is controlled at 1.6 MPa; when the filtrate flowing out of the filter cloth is ≤30 ml after 30 seconds, the filtration is completed; 621 filter cloth is used during pressing.

[0043] Test Experiment

[0044] The moisture content of the filter cakes in Examples 1-6 and Comparative Example 1 was determined. In Comparative Example 1, ultrafine ilmenite with a -200 mesh content of 95.33% and a -800 mesh content of 58.22% was used as the filter material. Examples 1, 2, and 3 used ultrafine ilmenite with a -200 mesh content of 95.33% and a -800 mesh content of 58.22% as the filter material. 22% ultrafine ilmenite was used as the filter material in the experiment; Example 4 used ultrafine ilmenite with a -200 mesh content of 95.33% and a -800 mesh content of 58.22% as the filter material in the experiment; Example 5 used ultrafine ilmenite with a -200 mesh content of 95.33% and a -800 mesh content of 58.22% as the filter material in the experiment; Example 6 used ultrafine ilmenite with a -200 mesh content of 95.33% and a -800 mesh content of 58.22% as the filter material in the experiment; The composition of the ultrafine titanium concentrate used in Examples 1-5 and Comparative Example 1 is the same, as shown in Table 1:

[0045] Table 1: Particle size distribution of titanium concentrate

[0046]

[0047] Experimental results: The moisture content of the filter cake in Comparative Example 1 was 17.84%; the moisture content of the filter cake in Example 1 was 12.67%; the moisture content of the filter cake in Example 2 was 11.80%; the moisture content of the filter cake in Example 3 was 11.96%; the moisture content of the filter cake in Example 4 was 11.32%; the moisture content of the filter cake in Example 5 was 9.96%; and the moisture content of the filter cake in Example 6 was 9.36%. The test results show that this invention provides a method for reducing the moisture content of ultrafine ilmenite filter cake, effectively improving the production efficiency of ultrafine ilmenite filtration and reducing the moisture content of the filter cake.

[0048] In summary, this invention improves the production efficiency of ultrafine titanium concentrate obtained after flotation and filter aids by adding them together to a mixing tank for stirring, followed by feeding and pressing after stirring, and finally pressing to obtain the filtrate. This method effectively improves the production efficiency of ultrafine ilmenite filtration and reduces the moisture content of the filter cake.

[0049] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0050] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A method of reducing the moisture content of ultra-fine grained ilmenite filter cake, characterized in that, The steps are: The ultra-fine titanium concentrate obtained after flotation and a filtering aid are added into the stirring barrel together for stirring, the stirring time is 5-10 min; the filtering aid is a 7:3 mixture of sodium dodecyl sulfonate and ethyl oleate, the addition amount is 200 g / t-500 g / t dry ore; After the stirring is completed, feeding pressure filtration is performed, the feeding pressure is controlled to be 0.8 MPa-1.6 MPa; After the feeding is completed, pressing is performed, the pressing pressure is controlled to be 1.6 MPa-2.6 MPa, the amount of the filtrate flowing out is monitored during the pressing, when the filter cloth flows out the filtrate of ≤30 ml within 30 seconds, the pressing is ended, and the filter cake and the filtrate are obtained.

2. The method of reducing the moisture of ultra-fine grained ilmenite filter cake according to claim 1, characterized in that, The method for performing the feeding pressure filtration after the stirring is completed is as follows: after the stirring is completed, the feeding valve and the mortar pump are opened, the feeding pressure filtration is performed, when the feeding pressure is stable, the mortar pump and the feeding valve are closed, and the feeding is ended.

3. The method of reducing the moisture content of ultra-fine grained ilmenite filter cake according to claim 1, characterized in that, The method for performing the pressing is as follows: the pressing valve and the pressing pump are opened to perform the pressing to obtain the filtrate, when the filtrate meets the ending standard, the pressing is ended.

4. The method of reducing the moisture content of ultra-fine grained ilmenite filter cake according to claim 1, characterized in that, The filter cloth used during the pressing is 621 filter cloth.

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