Ilmenite plant configuration and process return method

Abstract

The application discloses a titanium iron ore equipment configuration and process returning method, relates to the technical field of ore dressing, and comprises titanium roughing operation, titanium scavenging I operation, titanium scavenging II operation, titanium concentration I operation, titanium concentration II operation, titanium concentration III operation and titanium concentration IV operation, each operation adopts the same number of flotation machines: a single froth tank is arranged for the first flotation machine, and one froth tank is shared by other flotation machines; froth products of the first flotation machine of the roughing and concentration operations are returned to the first flotation machine of the next operation, froth products of other flotation machines are returned to the second flotation machine of the next operation, froth products of the first flotation machine of the scavenging operation are returned to the first flotation machine of the previous operation, froth products of other flotation machines are returned to the second flotation machine of the previous operation, and underflow of the concentration operation is returned to the second flotation machine of the previous operation. The application realizes differential separation of titanium iron ore, reduces the circulating load of middlings, reduces the sulfuric acid consumption, improves the enrichment effect of the concentrate, and finally achieves the effects of improving the quality of the concentrate and the system recovery rate.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of ore dressing, in particular to a titanium-iron ore equipment configuration and process returning method. BACKGROUND

[0002] In the prior art, the iron in the raw ore is selected by a multi-stage fine grinding and weak magnetic separation process, the tailings of the iron are selected by a grading-spiral chute reselection-strong magnetic separation-sulfur flotation-titanium flotation process, the flotation of the titanium-iron ore generally adopts a roughing and two scavenging and four cleaning operation, and a typical process flow is shown in Fig. Figure 1 The ore slurry after stirring and pulp mixing is fed into the flotation system, and the operation includes one roughing, two scavenging and four cleaning, and the middlings are sequentially returned to finally produce qualified concentrate and tailings. The equipment configuration is shown in Fig. Figure 2 The biggest feature of the conventional titanium flotation sequential return equipment configuration is that the middlings are combined and returned. For the roughing operation, the three materials of fresh feed, Scavenger I foam and Cleaner I underflow are generally combined and fed into the first flotation machine of the roughing operation. Only when the suction capacity of the equipment is insufficient, the multiple materials are considered to be returned separately to ensure the smoothness of the process. However, the differential feeding based on the separation performance is basically not involved. Secondly, based on the convenience of maintenance of the plant, the equipment types of the various operations are kept consistent. Finally, due to the consistency of the equipment types, the number of flotation machines of the various operations is different. However, with the increase of the mining intensity, the grade of the titanium-iron ore is lower and lower, the embedded particle size is obviously finer, and the association of the titanium-iron ore and the gangue minerals is more and more complex, which leads to the problems of low cleaning enrichment ratio of the titanium-iron ore in the flotation recovery process, and the difficulty in simultaneously ensuring the concentrate grade and the recovery rate. In order to solve the above problems, in the production practice, the number of cleaning operations is generally increased, the sulfuric acid consumption of the cleaning stage is increased to improve the concentrate grade, the roughing and scavenging operation yield is increased, and the flotation time is prolonged to ensure the recovery rate. Finally, the problems of the multiple titanium-iron ore flotation operations, long process flow, large acid consumption, large middling circulation load and large operation yield occur, which are not conducive to the large-scale and efficient recovery of the titanium-iron ore.

[0003] A China invention patent with the application number CN202110576866.7, the publication date of 20210827 and the name of a speed separation flotation process for sphalerite, divides the roughing into two stages (roughing one and roughing two), the sphalerite with better floatability, less entrainment and higher grade enters the zinc cleaning two operation, the sphalerite with poor floatability and more intergrowth enters the zinc cleaning one operation, the middlings in the zinc cleaning one are regrinded to improve the dissociation degree and then returned to the zinc roughing two. The sphalerite inclusions are effectively reduced, the zinc concentrate grade is improved, the process circulation amount is reduced, the equipment load is reduced, and better flotation indexes are obtained.

[0004] However, the two-stage roughing sphalerite fractional flotation process only achieves a small-scale transfer of high-quality concentrate from the roughing operation. Furthermore, the high-quality froth from the first roughing stage is returned to the second finishing stage, significantly reducing the grade of the first finishing stage. This inevitably leads to a decrease in the grade of the froth product from the first finishing stage. After the system is balanced, the grade of the second finishing stage tends to be consistent with the concentrate quality achievable by the first-stage roughing stage. Moreover, the froth product after the roughing stage is also mixed in the second finishing stage. Therefore, this invention does not achieve differentiated fractional flotation of froth products and is not fundamentally different from conventional processes.

[0005] Chinese invention patent application CN202410678028.4, published on 20240910, entitled "A Flotation Process to Improve Flotation Efficiency," addresses the contradictions in existing flotation processes, such as insufficient liberation and over-grinding in middlings return. The proposed method involves first flotating all middlings, then enriching and re-entraining valuable minerals with some liberation but insufficient enrichment, thus avoiding over-grinding during regrinding of these selectable minerals. Re-grinding and re-flotation of the middlings after flotation further improves flotation efficiency. However, this process uses centralized middlings processing, first flotating to separate high-liberation froth products, then feeding them into regrinding, and finally feeding them into the roughing operation, increasing process complexity and grinding power consumption. Furthermore, it does not differentiate the collection and return of froth products.

[0006] Therefore, the existing technologies mentioned above still suffer from problems such as high ore circulation load, large sulfuric acid consumption, low concentrate enrichment ratio, low concentrate grade, and low recovery rate. Summary of the Invention

[0007] The purpose of this invention is to provide a configuration method and process return method for ilmenite flotation, which solves the problems of high ore circulation load, high sulfuric acid consumption, low concentrate enrichment ratio, difficulty in ensuring concentrate grade and low recovery rate in the existing ilmenite flotation process.

[0008] The present invention solves the above problems through the following technical solution:

[0009] A method for configuring and returning ilmenite processing equipment includes titanium roughing, titanium scavenging I, titanium scavenging II, titanium cleaning I, titanium cleaning II, titanium cleaning III, and titanium cleaning IV operations. Each operation uses the same number of N flotation machines, where N≥2. The volume of the flotation machines is adjusted to match the flotation time of each operation. The first flotation machine in each operation is equipped with a separate froth tank, while the other flotation machines share a single froth tank. The method for returning the froth product is as follows:

[0010] The froth product of the first flotation machine of the titanium roughing operation is returned to the first flotation machine of the titanium cleaning I operation, the froth product of the first flotation machine of the titanium scavenging I operation is returned to the first flotation machine of the titanium roughing operation, the froth product of the first flotation machine of the titanium scavenging II operation is returned to the first flotation machine of the titanium scavenging I operation, the froth of the first flotation machine of the titanium cleaning I operation is returned to the first flotation machine of the titanium cleaning II operation, the froth of the first flotation machine of the titanium cleaning II operation is returned to the first flotation machine of the titanium cleaning III operation, and the froth of the first flotation machine of the titanium cleaning III operation is returned to the first flotation machine of the titanium cleaning IV operation.

[0011] The froth product of the flotation machine other than the first flotation machine of the titanium roughing operation is returned to the second flotation machine of the titanium cleaning I operation, the froth product of the flotation machine other than the first flotation machine of the titanium scavenging I operation is returned to the second flotation machine of the titanium roughing operation, the froth product of the flotation machine other than the first flotation machine of the titanium scavenging II operation is returned to the second flotation machine of the titanium scavenging I operation, the froth product of the flotation machine other than the first flotation machine of the titanium cleaning I operation is returned to the second flotation machine of the titanium cleaning II operation, the froth product of the flotation machine other than the first flotation machine of the titanium cleaning II operation is returned to the second flotation machine of the titanium cleaning III operation, and the froth product of the flotation machine other than the first flotation machine of the titanium cleaning III operation is returned to the second flotation machine of the titanium cleaning IV operation.

[0012] The underflow of the titanium cleaning II operation is returned to the second flotation machine of the titanium cleaning I operation, the underflow of the titanium cleaning III operation is returned to the second flotation machine of the titanium cleaning II operation, and the underflow of the titanium cleaning IV operation is returned to the second flotation machine of the titanium cleaning III operation.

[0013] The present application creates different flotation paths and flotation times for fully dissociated particles and intergrowth particles by the consistent number of flotation equipment configuration mode, the setting mode of froth tank and the returning mode of froth product, forms a fast channel for high-quality ilmenite with full dissociation in the flotation process, realizes timely and efficient recovery with the optimal path and the fastest speed, can meet the rapid and efficient recovery of froth product, and can make the intergrowth particles fully float through a relatively long flotation path and time, so that the ilmenite is differentiated and sorted, the middling circulation load is reduced, the sulfuric acid consumption is reduced, the concentrate enrichment effect is improved, and the quality of the concentrate and the system recovery rate are improved.

[0014] Further, the first flotation machine of each operation is provided with a separate froth tank, and the other flotation machines share one froth tank, which is replaced by a separate froth tank for each flotation machine of each operation, and the returning method of the froth product is as follows:

[0015] The froth products of N flotation machines of the titanium roughing operation are returned one-to-one to N flotation machines of the titanium cleaning I operation, the froth products of N flotation machines of the titanium scavenging I operation are returned one-to-one to N flotation machines of the titanium roughing operation, the froth products of N flotation machines of the titanium scavenging II operation are returned one-to-one to N flotation machines of the titanium scavenging I operation, the froth products of N flotation machines of the titanium cleaning I operation are returned one-to-one to N flotation machines of the titanium cleaning II operation, the froth products of N flotation machines of the titanium cleaning II operation are returned one-to-one to N flotation machines of the titanium cleaning III operation, and the froth products of N flotation machines of the titanium cleaning III operation are returned one-to-one to N flotation machines of the titanium cleaning IV operation.

[0016] The underflows of the titanium cleaning II operation are returned to the second flotation machine of the titanium cleaning I operation after being combined, the underflows of the titanium cleaning III operation are returned to the second flotation machine of the titanium cleaning II operation after being combined, and the underflows of the titanium cleaning IV operation are returned to the second flotation machine of the titanium cleaning III operation after being combined.

[0017] Further, the return mode of the froth products depends on the configuration form of the flotation machine: when the flotation machine is in a stepped configuration, there are two cases, for the froth self-flowing case, the flotation middlings are directly returned by self-flowing through a pipeline, and for the ore pulp self-flowing case, the middlings are returned by an additional pump.

[0018] Further, when N > 2, the return mode of the froth products depends on the configuration form of the flotation machine: when the flotation machine is in a horizontal configuration, at least the first two flotation machines of each operation are configured as suction tank flotation machines, and the rest are direct current tank flotation machines, and the self-circulation of the flotation middlings is realized by the configuration of the suction tank flotation machines.

[0019] Further, the flotation time of the titanium roughing operation, the titanium scavenging I operation and the titanium scavenging II operation is set to 45-65 min, and the flotation time of the titanium cleaning I operation, the titanium cleaning II operation, the titanium cleaning III operation and the titanium cleaning IV operation is set to 60-80 min.

[0020] Further, the flotation machine cancels the froth pushing cone structure, the overflow weir structure and the froth flushing water device.

[0021] Compared with the prior art, the present application has the following advantages and beneficial effects:

[0022] (1) The present application creates different flotation paths and flotation times for fully monomer dissociated particles and intergrowth particles, forms a fast channel for high-quality ilmenite with full monomer dissociation in the flotation process, realizes timely and efficient recovery with the optimal path and the fastest speed, can meet the rapid and efficient recovery of froth products, and can make intergrowth particles pass through a relatively long flotation path and time for full flotation, so as to realize differential separation of ilmenite, reduce the circulating load of middlings, reduce the amount of sulfuric acid, improve the enrichment effect of the concentrate, and ultimately improve the quality of the concentrate and the system recovery rate without changing the original system dynamic balance.

[0023] (2) The present application adopts the flotation device configuration mode with the same number of devices for roughing operation, scavenging operation and cleaning operation, keeps the original process flow and flotation time unchanged, adjusts the volume of the flotation device to ensure the consistency of the overall flotation time, and realizes the collection and return of different quality froth products by setting two separate froth tanks for each operation, so as to: 1) provide a new type of froth rapid and forced recovery device for large circular tank flotation machines, reduce the residence time of froth in the tank, and increase the flotation efficiency and mineral recovery rate; 2) simplify the structure of the flotation machine, cancel the push bubble cone, froth tank, overflow weir and other structures, and facilitate equipment maintenance; 3) the device has the function of defoaming, cancels the froth washing water device, and is conducive to solving the subsequent problem of difficult defoaming of oxidized minerals such as bauxite and potassium salt, and saving water resources; 4) the device is conducive to reducing the probability of shedding of coarse and heavy minerals during the process of passing through the froth layer, and increasing the recovery rate of coarse particles. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a typical flotation process flowchart in the prior art;

[0025] Figure 2 is a typical ilmenite concentrator device configuration schematic diagram in the prior art;

[0026] Figure 3 is a device configuration and flow return schematic diagram of the present application. DETAILED DESCRIPTION

[0027] The present application will be further described in detail below in combination with examples, but the embodiments of the present application are not limited thereto.

[0028] Example 1:

[0029] In combination with the attached Figure 3As shown, a method for configuring and returning of ilmenite equipment, including ilmenite roughing operation, ilmenite scavenging I operation, ilmenite scavenging II operation, ilmenite cleaning I operation, ilmenite cleaning II operation, ilmenite cleaning III operation and ilmenite cleaning IV operation, taking 4 flotation machines for each operation as an example, the volume of the flotation machine is adjusted to match the flotation time of each operation;

[0030] The first flotation machine of each operation is provided with a separate froth tank, and the second to fourth flotation machines share one froth tank; the return of froth products is as follows:

[0031] The froth product of the first flotation machine of the ilmenite roughing operation is returned to the first flotation machine of the ilmenite cleaning I operation, the froth product of the first flotation machine of the ilmenite scavenging I operation is returned to the first flotation machine of the ilmenite roughing operation, the froth product of the first flotation machine of the ilmenite scavenging II operation is returned to the first flotation machine of the ilmenite scavenging I operation, the froth of the first flotation machine of the ilmenite cleaning I operation is returned to the first flotation machine of the ilmenite cleaning II operation, the froth of the first flotation machine of the ilmenite cleaning II operation is returned to the first flotation machine of the ilmenite cleaning III operation, and the froth of the first flotation machine of the ilmenite cleaning III operation is returned to the first flotation machine of the ilmenite cleaning IV operation;

[0032] The froth products of the second to fourth flotation machines of the ilmenite roughing operation are returned to the second flotation machine of the ilmenite cleaning I operation, the froth products of the second to fourth flotation machines of the ilmenite scavenging I operation are returned to the second flotation machine of the ilmenite roughing operation, the froth products of the second to fourth flotation machines of the ilmenite scavenging II operation are returned to the second flotation machine of the ilmenite scavenging I operation, the froth products of the second to fourth flotation machines of the ilmenite cleaning I operation are returned to the second flotation machine of the ilmenite cleaning II operation, the froth products of the second to fourth flotation machines of the ilmenite cleaning II operation are returned to the second flotation machine of the ilmenite cleaning III operation, and the froth products of the second to fourth flotation machines of the ilmenite cleaning III operation are returned to the second flotation machine of the ilmenite cleaning IV operation;

[0033] The underflow of the ilmenite cleaning II operation is returned to the second flotation machine of the ilmenite cleaning I operation, the underflow of the ilmenite cleaning III operation is returned to the second flotation machine of the ilmenite cleaning II operation, and the underflow of the ilmenite cleaning IV operation is returned to the second flotation machine of the ilmenite cleaning III operation.

[0034] Further, taking a flotation line with a processing capacity of 1700t / d as an example, the ilmenite roughing operation and the ilmenite cleaning I operation each use 4 16m 3 flotation machines, the ilmenite scavenging I operation, the ilmenite scavenging II operation and the ilmenite cleaning II operation, the ilmenite cleaning III operation each use 4 12m 3 flotation machines, and the ilmenite cleaning IV operation uses 4 4m 3 flotation machines.

[0035] Further, the return mode of the froth product is determined according to the configuration form of the flotation machine:

[0036] 1) When the flotation machine is horizontally configured, at least the first two flotation machines in each operation are configured as suction tank flotation machines, and the rest are direct current tank flotation machines, and the self-circulation of the flotation middlings is realized by the configuration of the suction tank flotation machines;

[0037] 2) When the flotation machine is configured in a ladder form, including two cases, for the case of froth self-flow, the flotation middlings are directly returned by pipeline self-flow, and for the case of slurry self-flow, the middlings are returned by an additional pump.

[0038] Further, the flotation time of the titanium roughing operation, the titanium scavenging I operation and the titanium scavenging II operation is set to 45-65 min, and the flotation time of the titanium concentration I operation, the titanium concentration II operation, the titanium concentration III operation and the titanium concentration IV operation is set to 60-80 min.

[0039] In the present application, the roughing operation, the scavenging operation and the concentration operation adopt the configuration mode of the flotation equipment with consistent equipment quantity, the original process flow and the flotation time are kept unchanged, the overall flotation time is ensured by adjusting the volume of the flotation equipment, the collection and return of the different quality froth products are realized by setting two separate froth tanks for each operation, the differential recovery path of different minerals is constructed, and the fast flotation and fast output of the fully dissociated minerals are realized.

[0040] The present application creates different flotation paths and flotation times for fully dissociated particles and intergrowth particles, forms a rapid channel for fully dissociated high-quality ilmenite in the flotation process, realizes timely and efficient recovery with the optimal path and the fastest speed, can meet the rapid and efficient recovery of froth products, and can make the intergrowth particles fully float through a relatively long flotation path and time, finally realizes the differential separation of ilmenite without changing the original system dynamic balance, reduces the circulating load of middlings, reduces the sulfuric acid consumption, improves the concentrate enrichment effect, and finally achieves the effect of improving the concentrate quality and system recovery rate.

[0041] Example 2:

[0042] On the basis of example 1, the four flotation machines in each operation are all provided with a separate froth tank, and the return of the froth product is replaced by:

[0043] The froth products of the 4 flotation machines of the titanium roughing operation are returned one-to-one to the 4 flotation machines of the titanium cleaning I operation, the froth products of the 4 flotation machines of the titanium scavenging I operation are returned one-to-one to the 4 flotation machines of the titanium roughing operation, the froth products of the 4 flotation machines of the titanium scavenging II operation are returned one-to-one to the 4 flotation machines of the titanium scavenging I operation, the froth products of the 4 flotation machines of the titanium cleaning I operation are returned one-to-one to the 4 flotation machines of the titanium cleaning II operation, the froth products of the 4 flotation machines of the titanium cleaning II operation are returned one-to-one to the 4 flotation machines of the titanium cleaning III operation, and the froth products of the 4 flotation machines of the titanium cleaning III operation are returned one-to-one to the 4 flotation machines of the titanium cleaning IV operation.

[0044] The underflows of the titanium cleaning II operation are returned to the second flotation machine of the titanium cleaning I operation after being combined, the underflows of the titanium cleaning III operation are returned to the second flotation machine of the titanium cleaning II operation after being combined, and the underflows of the titanium cleaning IV operation are returned to the second flotation machine of the titanium cleaning III operation after being combined.

[0045] One-to-one return of froth products is achieved.

[0046] Although the present application has been described with reference to the explanatory embodiments thereof, the above-described embodiments are merely preferred embodiments of the present application, and the embodiments of the present application are not limited to the above-described embodiments, and it should be understood by those skilled in the art that many other modifications and embodiments can be devised, and such modifications and embodiments will fall within the scope and spirit of the principles disclosed in the present application.

Claims

1. A method for ilmenite plant configuration and flow back, comprising a roughing operation of titanium, a scavenging I operation of titanium, a scavenging II operation of titanium, a concentrating I operation of titanium, a concentrating II operation of titanium, a concentrating III operation of titanium and a concentrating IV operation of titanium, characterized in that, Each job adopts the same number of N flotation machines, wherein N≥2, the flotation machines are matched with the flotation time of each job by adjusting the volume of the flotation machines, the 1st flotation machine of each job is provided with a separate froth tank, and other flotation machines share one froth tank, and the returning method of the froth product is: The froth product of the 1st flotation machine of the titanium roughing job is returned to the 1st flotation machine of the titanium cleaning I job, the froth product of the 1st flotation machine of the titanium scavenging I job is returned to the 1st flotation machine of the titanium roughing job, the froth product of the 1st flotation machine of the titanium scavenging II job is returned to the 1st flotation machine of the titanium scavenging I job, the froth of the 1st flotation machine of the titanium cleaning I job is returned to the 1st flotation machine of the titanium cleaning II job, the froth of the 1st flotation machine of the titanium cleaning II job is returned to the 1st flotation machine of the titanium cleaning III job, and the froth of the 1st flotation machine of the titanium cleaning III job is returned to the 1st flotation machine of the titanium cleaning IV job; The froth product of the flotation machine other than the 1st flotation machine of the titanium roughing job is returned to the 2nd flotation machine of the titanium cleaning I job, the froth product of the flotation machine other than the 1st flotation machine of the titanium scavenging I job is returned to the 2nd flotation machine of the titanium roughing job, the froth product of the flotation machine other than the 1st flotation machine of the titanium scavenging II job is returned to the 2nd flotation machine of the titanium scavenging I job, the froth product of the flotation machine other than the 1st flotation machine of the titanium cleaning I job is returned to the 2nd flotation machine of the titanium cleaning II job, the froth product of the flotation machine other than the 1st flotation machine of the titanium cleaning II job is returned to the 2nd flotation machine of the titanium cleaning III job, and the froth product of the flotation machine other than the 1st flotation machine of the titanium cleaning III job is returned to the 2nd flotation machine of the titanium cleaning IV job; The underflow of the titanium cleaning II job is returned to the 2nd flotation machine of the titanium cleaning I job, the underflow of the titanium cleaning III job is returned to the 2nd flotation machine of the titanium cleaning II job, and the underflow of the titanium cleaning IV job is returned to the 2nd flotation machine of the titanium cleaning III job.

2. A method of ilmenite plant configuration and flow back according to claim 1, wherein, The 1st flotation machine of each job is provided with a separate froth tank, and other flotation machines share one froth tank is replaced by that each job is provided with a separate froth tank, and the returning method of the froth product is: The froth product of the N flotation machines of the titanium roughing job is one-to-one returned to the N flotation machines of the titanium cleaning I job, the froth product of the N flotation machines of the titanium scavenging I job is one-to-one returned to the N flotation machines of the titanium roughing job, the froth product of the N flotation machines of the titanium scavenging II job is one-to-one returned to the N flotation machines of the titanium scavenging I job, the froth product of the N flotation machines of the titanium cleaning I job is one-to-one returned to the N flotation machines of the titanium cleaning II job, the froth product of the N flotation machines of the titanium cleaning II job is one-to-one returned to the N flotation machines of the titanium cleaning III job, and the froth product of the N flotation machines of the titanium cleaning III job is one-to-one returned to the N flotation machines of the titanium cleaning IV job; The underflow of the titanium roughing operation is combined and returned to the second flotation machine of the titanium roughing I operation, the underflow of the titanium roughing III operation is combined and returned to the second flotation machine of the titanium roughing II operation, and the underflow of the titanium roughing IV operation is combined and returned to the second flotation machine of the titanium roughing III operation.

3. A method according to claim 1 or 2, wherein, The return mode of the froth product depends on the configuration of the flotation machine: when the flotation machine is in a stepped configuration, there are two cases, for the case of froth self-flow, the flotation middlings are directly returned by self-flow through a pipeline, and for the case of pulp self-flow, the middlings are returned by an additional pump.

4. A method according to claim 1 or 2, wherein, When N>2, the return mode of the froth product depends on the configuration of the flotation machine: when the flotation machine is in a horizontal configuration, the first two flotation machines of each operation are configured as suction slot flotation machines, and the rest are direct current slot flotation machines, and the self-circulation of the flotation middlings is realized by the configuration of the suction slot flotation machines.

5. A method of ilmenite plant configuration and flow back according to claim 1 or 2, wherein, The flotation time of the titanium roughing operation, the titanium scavenging I operation and the titanium scavenging II operation is set to 45-65 min, and the flotation time of the titanium roughing I operation, the titanium roughing II operation, the titanium roughing III operation and the titanium roughing IV operation is set to 60-80 min.

6. A method of ilmenite plant configuration and flow back according to claim 1 or 2, wherein, The flotation machine cancels the froth pushing cone structure, the overflow weir structure and the froth flushing water device.

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