A recovery method for separating titanium from titanium-containing iron tailings

Abstract

The application discloses a recovery method for separating titanium from titanium-containing iron tailings, which comprises the following steps: slurry-making of the titanium-containing iron tailings to reach the concentration requirement of a first-stage high-intensity magnetic separation; first-stage high-intensity magnetic separation of the titanium-containing iron tailings, so that the magnetic material enters a grading grinding process; iron removal of the magnetic material after the grading grinding process to obtain iron concentrate; spiral chute gravity separation of the slurry after the iron removal, so that the gravity separation concentrate is used as titanium concentrate, and tailings enter a grading concentration process; the non-magnetic material after the first-stage high-intensity magnetic separation and the tailings after the gravity separation both enter the grading concentration process; coarse-grained material after the grading concentration enters a second-stage high-intensity magnetic separation, so that the concentrate is used as secondary titanium concentrate, and the tailings and fine-grained material after the grading concentration both enter a cloth chute gravity separation, so that the gravity separation concentrate is used as the secondary titanium concentrate, and the gravity separation tailings are discharged into a tailings pond or are dry discharged. The method increases the secondary titanium concentrate product, can improve the recovery rate by more than 15%, and improves the economic benefits.

Description

Technical Field

[0001] This invention relates to mineral sorting methods and comprehensive resource utilization, particularly to a method for separating and recovering titanium from titanium-containing iron tailings. Background Technology

[0002] Titanium dioxide (TiO2), with its non-toxic properties, optimal opacity, and superior whiteness and gloss, is considered the best-performing white pigment in the world today. Titanium dioxide has strong adhesion, is not easily chemically altered, and remains perpetually snow-white. It is widely used in industries such as coatings, plastics, papermaking, printing inks, synthetic fibers, rubber, and cosmetics.

[0003] Panzhihua and Chengde in my country possess abundant vanadium-titanium magnetite resources; however, the current recovery rate of ilmenite beneficiation in my country is generally only 20% to 40% TiO2. Therefore, industry players hope to improve titanium beneficiation recovery rates and reduce production costs by optimizing the titanium beneficiation process and increasing the production of secondary titanium concentrate. This case study is based on the current industry needs and has achieved excellent results. Summary of the Invention

[0004] The purpose of this invention is to provide a method for separating titanium from titanium-containing iron tailings, thereby increasing the amount of secondary titanium concentrate products and improving the yield and recovery rate.

[0005] To achieve the above objectives, the solution of the present invention is:

[0006] A method for recovering titanium from titanium-bearing iron tailings comprises the following steps:

[0007] A. Pulping: Pulping is performed on the titanium-containing iron tailings to achieve a concentration that meets the requirements of a first-stage strong magnetic separation.

[0008] B, First-stage high-intensity magnetic separation: First-stage high-intensity magnetic separation is performed on titanium-containing iron tailings;

[0009] Magnetic materials enter the C1 classifier grinding process;

[0010] Non-magnetic materials enter the C2 stage concentration;

[0011] C1, Classification and Grinding: The magnetic material after the first-stage strong magnetic separation in step B enters the classification and grinding process;

[0012] D1, Iron Removal: The magnetic material after the C1 step of classification and grinding undergoes weak magnetic separation, and the resulting magnetic material is iron concentrate.

[0013] This is beneficial for improving the TiO2 grade of the re-separation concentrate in the next stage;

[0014] E1, gravity separation, D1 iron removal slurry enters spiral chute gravity separation, gravity separation concentrate is used as titanium concentrate, tailings enter C2 stage concentration.

[0015] C2, Classification and Concentration: The non-magnetic material after the first-stage strong magnetic separation in step B and the tailings in step E1 both enter the classification and concentration stage.

[0016] Coarse-grained materials enter the D2 stage of high-intensity magnetic separation;

[0017] Fine-grained materials enter the E2 gravity separation process;

[0018] D2, Second-stage high-intensity magnetic separation: The coarse-grained material from the C2 stage concentration undergoes a second-stage high-intensity magnetic separation; the concentrate from the second-stage high-intensity magnetic separation is used as secondary titanium concentrate, and the tailings from the second-stage high-intensity magnetic separation enter the E2 gravity separation.

[0019] E2, gravity separation: The fine-grained material from the C2 step classification and concentration and the tailings from the second-stage strong magnetic separation in the D2 step are both fed into the cloth sluice for gravity separation; the cloth sluice is beneficial for recovering fine-grained titanium-containing minerals and improving the recovery rate.

[0020] The concentrate obtained from the re-separation is used as secondary titanium concentrate, and the tailings from the re-separation are discharged into a tailings pond or dry discharge.

[0021] In step A, the grinding fineness of the ilmenite tailings is -200 mesh, accounting for 30%-40%, the slurry concentration is 15%-25%, and the TiO2 grade is 8-10%.

[0022] In step B, the magnetic intensity of the first-stage strong magnetic separation is 0.8-1.0T. Through the first-stage strong magnetic separation, the grade is increased from 8-10% to 15%, the magnetic material yield of the first-stage strong magnetic separation is 55%-60%, and the operation recovery rate is about 90%.

[0023] In step C1, the particle size of the graded grinding is -200 mesh, and the content is 40-60%.

[0024] In step D1, the magnetic field strength for weak magnetic separation of iron is 0.2T.

[0025] In step E1, the spiral chute reselection adopts a process of coarse, sweep, and fine separation.

[0026] First, the material enters a roughing stage; the concentrate from the roughing stage enters a cleaning stage; the tailings enter a scavenging stage; and the middlings are returned to the feed inlet of the roughing stage, forming a closed loop.

[0027] The concentrate from the first stage of refining enters the second stage of refining, the tailings enter the first stage of roughing, and the middlings return to the feed inlet of the first stage of refining, forming a closed loop. The concentrate from the second stage of refining enters the third stage of refining, the tailings enter the first stage of refining, and the middlings return to the feed inlet of the second stage of refining, forming a closed loop. The concentrate from the third stage of refining is used as titanium concentrate, the tailings enter the second stage of refining, and the middlings return to the feed inlet of the third stage of refining, forming a closed loop. The titanium concentrate grade is 45%-47%, the yield is 8%-10%, and the recovery rate is 40%-50%.

[0028] The concentrate from the first stage of scavenging enters the first stage of cleaning, the tailings enter the second stage of scavenging, and the middlings return to the feed inlet of the first stage of scavenging to form a closed loop. The concentrate from the second stage of scavenging enters the first stage of cleaning, the tailings enter the C2 classification and concentration, and the middlings return to the feed inlet of the second stage of scavenging to form a closed loop.

[0029] In step C2, the preferred equipment for classification and concentration is a hydrocyclone; the classification particle size is 200 mesh.

[0030] In step D2, the magnetic field strength of the two-stage strong magnetic separation is 1.0-1.5T.

[0031] After step E2, secondary titanium concentrate obtained by gravity separation in a sluice box and secondary titanium concentrate obtained by two-stage strong magnetic separation are laid out, with a grade of 30-35%, a yield of 5%-8%, and a recovery rate of 15%-20%.

[0032] After adopting the above scheme, the beneficial effects of the present invention are as follows: under the premise that the grade of ilmenite tailings is about 10% TiO2, it can achieve a titanium concentrate grade of 45%-47%, a yield of 8%-10%, and a recovery rate of 40%-50%, and a secondary titanium concentrate grade of 30-35%, a yield of 5%-8%, and a recovery rate of 15%-20%. The present invention increases the secondary titanium concentrate product and increases the recovery rate by more than 15%, thereby improving economic benefits. Attached Figure Description

[0033] Figure 1 This is a process flow diagram of the method of the present invention. Detailed Implementation

[0034] like Figure 1 As shown, this invention discloses a method for recovering titanium from ilmenite tailings, the specific steps of which are as follows:

[0035] A. Pulping: Pulping is carried out on the ilmenite tailings to achieve the required concentration for a single-stage strong magnetic separation. Specifically, the grinding fineness of the ilmenite tailings is 30%-40% -200 mesh, the pulp concentration is 15%-25%, and the TiO2 grade is 8-10%.

[0036] B, First-stage high-intensity magnetic separation: The titanium-containing iron tailings after pulping in step A are subjected to a first-stage high-intensity magnetic separation with a magnetic strength of 0.8-1.0T. Through the first-stage high-intensity magnetic separation, the grade is increased from 8%-10% to 15%. The yield of magnetic materials in the first-stage high-intensity magnetic separation is 55%-60%, and the recovery rate is about 90%.

[0037] Magnetic materials enter the classifying mill (C1); non-magnetic materials enter the classifying and concentrating mill (C2). Classifying and concentrating are carried out simultaneously.

[0038] C1, Classification and Grinding: The magnetic material after the first-stage strong magnetic separation in step B enters the classification and grinding process; the particle size of the classification and grinding process is -200 mesh, and the content is 40-60%.

[0039] D1, Iron Removal: The magnetic material after the C1 step of classification and grinding is subjected to weak magnetic separation. The magnetic field strength of the weak magnetic separation for iron removal is 0.2T. The magnetic material is iron concentrate. Removing the iron concentrate is beneficial to improving the TiO2 grade of the gravity separation concentrate in the next step.

[0040] E1, gravity separation. The slurry after iron removal in D1 enters the spiral sluice for gravity separation, adopting a process of roughing, scavenging, and cleaning. The gravity concentrate is used as titanium concentrate, and the tailings enter the C2 stage for concentration.

[0041] Specifically, the material first enters a roughing stage, the concentrate from the roughing stage enters a cleaning stage, the tailings enter a scavenging stage, and the middlings are returned to the feed inlet of the roughing stage to form a closed loop.

[0042] The concentrate from the first stage of refining enters the second stage of refining, the tailings enter the first stage of roughing, and the middlings return to the feed inlet of the first stage of refining, forming a closed loop. The concentrate from the second stage of refining enters the third stage of refining, the tailings enter the first stage of refining, and the middlings return to the feed inlet of the second stage of refining, forming a closed loop. The concentrate from the third stage of refining is used as titanium concentrate, the tailings enter the second stage of refining, and the middlings return to the feed inlet of the third stage of refining, forming a closed loop. The titanium concentrate grade is 45%-47%, the yield is 8%-10%, and the recovery rate is 40%-50%.

[0043] The concentrate from the first stage of scavenging enters the first stage of cleaning, the tailings enter the second stage of scavenging, and the middlings return to the feed inlet of the first stage of scavenging to form a closed loop. The concentrate from the second stage of scavenging enters the first stage of cleaning, the tailings enter the graded concentration C2, and the middlings return to the feed inlet of the second stage of scavenging to form a closed loop.

[0044] C2, Classification and Concentration: The non-magnetic material after the first stage of strong magnetic separation in step B and the tailings after the second stage of scavenging in step E1 both enter the classification and concentration. The preferred equipment for classification and concentration is a hydrocyclone; the classification particle size is 200 mesh.

[0045] Coarse-grained materials enter the second-stage strong magnetic separation D2; fine-grained materials enter the gravity separation E2.

[0046] D2, Second-stage high-intensity magnetic separation: The coarse-grained material concentrated in C2 undergoes a second-stage high-intensity magnetic separation with a magnetic field strength of 1.0-1.5T. The concentrate from the second-stage high-intensity magnetic separation is used as secondary titanium concentrate, and the tailings from the second-stage high-intensity magnetic separation enter the gravity separation E2.

[0047] E2, Gravity Separation: The fine-grained material from the C2 step classification and concentration and the tailings from the D2 step secondary strong magnetic separation are both fed into the cloth sluice for gravity separation. The cloth sluice is beneficial for recovering fine-grained titanium-containing minerals and improving the recovery rate. The concentrate from gravity separation is used as secondary titanium concentrate, and the tailings from gravity separation are discharged to the tailings pond or dry discharge.

[0048] The secondary titanium concentrate obtained by gravity separation via sluice box and secondary titanium concentrate obtained by two-stage high-intensity magnetic separation has a grade of 30-35%, a yield of 5%-8%, and a recovery rate of 15%-20%.

[0049] This invention increases the amount of secondary titanium concentrate products, increases the recovery rate by more than 15%, and improves economic benefits.

[0050] Table 1 compares the grade and recovery rate of titanium separated from titanium-bearing iron tailings using different recovery methods.

[0051]

[0052] The above describes the basic process of this invention, and any equivalent changes made based on the solution of this invention are within the scope of protection of this case.

Claims

1. A recovery method of separating titanium from a titanium-containing iron tailings, characterized by The steps are as follows: A, slurry making: the titanium-containing iron tailings are made into slurry, and the concentration reaches the requirement of the first stage high-intensity magnetic separation; B, first stage high-intensity magnetic separation: the titanium-containing iron tailings are subjected to the first stage high-intensity magnetic separation; The magnetic material enters C1 stage grinding; The non-magnetic material enters C2 stage concentration; C1, stage grinding: the magnetic material after the first stage high-intensity magnetic separation in step B enters the stage grinding; D1, iron removal: the magnetic material after the stage grinding in step C1 is subjected to the weak magnetic separation, and the magnetic material is the iron concentrate; E1, gravity separation: the slurry after the iron removal in step D1 enters the spiral chute for gravity separation, and the gravity separation concentrate is the titanium concentrate, and the tailings enter the C2 stage concentration; C2, stage concentration: the non-magnetic material after the first stage high-intensity magnetic separation in step B and the tailings in step E1 enter the stage concentration; The coarse-grained material enters D2 second stage high-intensity magnetic separation; The fine-grained material enters E2 gravity separation; D2, second stage high-intensity magnetic separation: the coarse-grained material after the stage concentration in step C2 is subjected to the second stage high-intensity magnetic separation; the concentrate of the second stage high-intensity magnetic separation is the secondary titanium concentrate, and the tailings of the second stage high-intensity magnetic separation enter E2 gravity separation; E2, gravity separation: the fine-grained material after the stage concentration in step C2 and the tailings of the second stage high-intensity magnetic separation in step D2 enter the cloth chute for gravity separation; The concentrate of the gravity separation is the secondary titanium concentrate, and the tailings of the gravity separation are discharged to the tailings pond or dry discharge.

2. A process for the recovery of titanium separated from titanium bearing iron tailings as claimed in claim 1, wherein: In the A step, the grinding fineness of the titanium-containing iron tailings is 30%-40% of-200 mesh, the slurry concentration is 15%-25%, and the TiO2 grade is 8-10%.

3. A process for the recovery of titanium separated from titanium bearing iron tailings as claimed in claim 1, wherein: In the B step, the magnetic intensity of the first stage high-intensity magnetic separation is 0.8-1.0 T, the grade is increased from 8-10% to 15% through the first stage high-intensity magnetic separation, the yield of the magnetic material of the first stage high-intensity magnetic separation is 55%-60%, and the operation recovery rate is 90%.

4. A process for the recovery of titanium separated from titanium bearing iron tailings as claimed in claim 1, wherein: In the C1 step, the stage grinding particle size is 40-60% of-200 mesh.

5. A process for the recovery of titanium separated from titanium bearing iron tailings as claimed in claim 1, wherein: In the D1 step, the magnetic field strength of the weak magnetic separation for iron removal is 0.2 T.

6. A process for the recovery of titanium separated from titanium bearing iron tailings as claimed in claim 1, wherein: In the E1 step, the spiral chute gravity separation adopts a roughing, two scavenging and three cleaning process; Firstly, the material enters the first stage roughing, the concentrate of the first stage roughing enters the first stage cleaning, the tailings enter the first stage scavenging, and the middlings return to the feeding port of the first stage roughing to form a closed circuit; The concentrate of the first stage cleaning enters the second stage cleaning, the tailings enter the first stage roughing, the middlings return to the feeding port of the first stage cleaning to form a closed circuit, the concentrate of the second stage cleaning enters the third stage cleaning, the tailings enter the first stage cleaning, the middlings return to the feeding port of the second stage cleaning to form a closed circuit, and the concentrate of the third stage cleaning is the titanium concentrate, and the tailings enter the second stage cleaning, the middlings return to the feeding port of the third stage cleaning to form a closed circuit; The concentrate of the first stage scavenging enters the first stage cleaning, the tailings enter the second stage scavenging, and the middlings return to the feeding port of the first stage scavenging to form a closed circuit, the concentrate of the second stage scavenging enters the first stage cleaning, the tailings enter the C2 stage concentration, and the middlings return to the feeding port of the second stage scavenging to form a closed circuit.

7. A process for the recovery of titanium separated from titanium bearing iron tailings as claimed in claim 6, wherein: In the E1 step, the grade of the titanium concentrate after the third stage cleaning is 45%-47%, the yield is 8%-10%, and the recovery rate is 40%-50%.

8. A process for the recovery of titanium separated from titanium bearing iron tailings as claimed in claim 1, wherein: In the C2 step, the equipment for the stage concentration is a cyclone; and the stage particle size is 200 mesh.

9. A process for the recovery of titanium separated from titanium bearing iron tailings as claimed in claim 1, wherein: In the D2 step, the magnetic field strength of the second stage high-intensity magnetic separation is 1.0-1.5 T.

10. A process for the recovery of titanium separated from titanium bearing iron tailings as claimed in claim 1, wherein: After the E2 step, the secondary titanium concentrate of cloth chute reselection and the secondary titanium concentrate of two-stage high-intensity magnetic separation have a grade of 30-35%, a yield of 5%-8%, and a recovery rate of 15%-20%.

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