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CN-117324113-B - Flotation method for improving recovery rate of coarse-fraction ilmenite

CN117324113BCN 117324113 BCN117324113 BCN 117324113BCN-117324113-B

Abstract

The invention relates to a flotation method for improving recovery rate of coarse-fraction ilmenite, belonging to the technical field of mineral flotation separation and comprehensive utilization. The invention prepares coarse-grain ilmenite into ore pulp, then carries out floatation desulfurization, adopts strong stirring for size mixing before floatation, then adds a floatation reagent, carries out primary floatation, carries out secondary floatation after the coarse-grain classification, and finally obtains ilmenite concentrate. According to the process, the ilmenite is subjected to strong stirring and size mixing, heterogeneous agglomeration between the ilmenite and gangue mineral particles can be effectively weakened, the effect of a flotation reagent and the surface of the mineral is enhanced, the enrichment effect of high grade and high recovery rate is achieved, coarse-grained ilmenite with qualified grade can be recovered in advance through screening and classifying operation, loss in the subsequent concentrating operation is reduced, and the improvement of the whole recovery rate of ilmenite sorting is facilitated. The grade qualified ilmenite is recovered in advance by adopting the classification operation, so that the ore quantity entering the subsequent concentration operation is greatly reduced, the dosage of ore dressing equipment and flotation agents is reduced, and the cost is reduced.

Inventors

  • MENG QINGYOU
  • YUAN ZHITAO
  • YU LI
  • LI LIXIA
  • LU JIWEI

Assignees

  • 东北大学

Dates

Publication Date
20260505
Application Date
20231114

Claims (10)

  1. 1. A flotation method for improving recovery rate of coarse fraction ilmenite, which is characterized by comprising the following process steps: Step 1, coarse-grain ilmenite is added into a separation raw material to prepare ore pulp, the ore pulp concentration is 30-40%, a collector and a foaming agent are added to carry out ilmenite flotation desulfurization, the desulfurization process is one-time roughing, roughing concentrate is sulfur concentrate, and flotation tailings are ilmenite flotation raw materials; Step 2, carrying out strong stirring and slurry mixing on the ilmenite flotation raw material obtained in the step 1, and gradually adding a flotation reagent, wherein the flotation reagent comprises a pH regulator sodium carbonate, an ilmenite activator lead nitrate and an ilmenite collector benzoic hydroxamic acid, and carrying out strong stirring and slurry mixing to obtain ilmenite inlet flotation pulp; Step 3, performing primary flotation on the ilmenite floating ore pulp obtained in the step 2, wherein the flotation process comprises primary roughing operation and primary scavenging operation, roughing concentrate is ilmenite primary flotation concentrate, scavenging tailings are flotation tailings, and scavenging concentrate returns to ilmenite roughing operation; step 4, carrying out coarse-fine classification on the ilmenite primary flotation concentrate in the step 3, wherein a coarse-grain product is a titanium concentrate I, and a fine-grain product is an ilmenite secondary flotation raw material; and 5, performing secondary flotation on the ilmenite secondary flotation raw material in the step 4, wherein the secondary flotation comprises primary roughing and primary concentration operation, so as to obtain titanium concentrate II, the secondary roughing tailings are used as middlings and returned to the primary flotation roughing operation, the secondary primary concentration tailings are used as middlings and returned to the secondary flotation roughing operation, and the concentrate I and the concentrate II are combined into final ilmenite concentrate.
  2. 2. The flotation method for improving the recovery rate of coarse-fraction ilmenite according to claim 1, wherein the particle size of the coarse-fraction ilmenite floating raw material in step 1, the content of-0.25 mm is more than or equal to 95%, the content of-0.075 mm is 20-30%, the total content of ilmenite monomers and the rich living bodies in the coarse-fraction ilmenite floating raw material is more than 90%, and the volume of ilmenite particles in the rich living bodies is more than 3/4.
  3. 3. The flotation process for increasing recovery of coarse fraction ilmenite of claim 1, wherein the collector in step1 is butyl xanthate and the frother is # 2 oil.
  4. 4. The flotation method for improving the recovery rate of coarse-grain ilmenite according to claim 1, wherein the strong stirring and size mixing in the step 2 is performed in a laboratory type flotation machine, and the stirring speed is controlled to 2600-3000 r/min during size mixing.
  5. 5. The flotation method for improving the recovery rate of coarse-grain ilmenite, according to claim 1, is characterized in that the pulp mixing time of adding the flotation reagent in the step 2 is that sodium carbonate is sequentially added for pulp mixing for 5min, lead nitrate is sequentially added for pulp mixing for 5min, and benzoic hydroxamic acid is sequentially added for pulp mixing for 10-20 min.
  6. 6. The flotation method for improving the recovery rate of coarse-grain ilmenite, according to claim 1, is characterized in that the pH value of ilmenite entering flotation pulp in the step 3 is 7.5-8.0, the scavenging operation is to add a pH regulator sodium carbonate into a flotation machine and to carry out size mixing for 2-4min, an activator lead nitrate and to carry out size mixing for 2-4min, and a collector benzoic hydroxamic acid and to carry out size mixing for 4-6min.
  7. 7. The flotation process for improving the recovery rate of coarse-grain ilmenite according to claim 1, wherein the primary flotation concentrate in step 4 is classified by hydraulic classification, the size of classification sieve is 0.075mm, and the coarse-grain ilmenite with acceptable grade is recovered in advance.
  8. 8. The flotation method for improving the recovery rate of coarse-fraction ilmenite according to claim 1, wherein the pH value of the secondary flotation pulp of the secondary flotation raw material of ilmenite in step 5 is 7.5-8.0, and the flotation middlings are returned sequentially.
  9. 9. The flotation method for improving the recovery rate of coarse-fraction ilmenite, according to claim 1, is characterized in that the dispersant water glass is added for 300-400 g/t in the two-stage flotation roughing operation in the step 5, the size mixing time is 5min, the fine-fraction ilmenite ore pulp system is ensured to be fully dispersed, and the water glass is not required to be added in the two-stage flotation concentration operation.
  10. 10. The flotation process for increasing the recovery of ilmenite of coarse size according to claim 1, wherein the flotation in steps 3 and 5 is performed by a froth flotation machine at a speed of 1992r/min.

Description

Flotation method for improving recovery rate of coarse-fraction ilmenite Technical Field The invention belongs to the technical field of mineral flotation separation and comprehensive utilization, and particularly relates to a flotation method for improving recovery rate of coarse fraction ilmenite. Background The method has the advantages that the method is rich in titanium resources in China, the Sichuan Panzhihua-Xichang area is a main primary ilmenite production place in China, more than 93% of the titanium resources in China are reserved in the Panxi area, the titanium resources are reserved in basic rock-super basic rock, ilmenite which is difficult to develop and utilize is mainly separated and recovered by adopting a principle process of classification, strong magnetism and floatation, ilmenite is separated and recovered into coarse fraction and fine fraction, but the recovery rate of the ilmenite resources is always lower, the recovery rate of floatation operation is about 75%, and how to improve the recovery rate of ilmenite is a main technical challenge. For flotation processes, the particle size of the feed has a large impact. In the coarse-fraction ilmenite flotation process, ilmenite particles cannot form effective mineralized bubbles due to large specific gravity and coarse size, and a flotation pressure tank phenomenon is easy to occur, so that the method is an important reason for low recovery rate of the coarse-fraction ilmenite. Therefore, coarse-grain ilmenite flotation is mostly carried out by adopting high-concentration separation, the concentration of ore pulp is increased to reduce the relative specific gravity of ilmenite, the dosage of the same-ratio agent is increased, and the adhesion force of coarse-grain ilmenite and bubbles is improved. But the heterogeneous agglomeration between ilmenite and gangue particles is easily caused by the separation of high ore pulp concentration and high dosage of the agent, which has great influence on the flotation separation of ilmenite, and finally the flotation process flow of the derived ilmenite is long, the agent cost is high, the separation index is not ideal, and the aim of efficiently utilizing titanium resources can not be achieved. Disclosure of Invention The invention aims to overcome the defects in the prior art and provide a flotation method for improving the recovery rate of coarse-grain ilmenite, which can remarkably improve the recovery rate of titanium concentrate and reduce the beneficiation cost of ilmenite. In order to achieve the above purpose, the present invention adopts the following technical scheme: a flotation method for improving recovery rate of coarse fraction ilmenite, comprising the following process steps: Step 1, coarse-grain ilmenite is added into a separation raw material to prepare ore pulp, the ore pulp concentration is 30-40%, a collector and a foaming agent are added to carry out ilmenite flotation desulfurization, the desulfurization process is one-time roughing, roughing concentrate is sulfur concentrate, and flotation tailings are ilmenite flotation raw materials; Step 2, carrying out strong stirring and slurry mixing on the ilmenite flotation raw material obtained in the step 1, and gradually adding a flotation reagent, wherein the flotation reagent comprises a pH regulator sodium carbonate, an ilmenite activator lead nitrate and an ilmenite collector benzoic hydroxamic acid, and carrying out strong stirring and slurry mixing to obtain ilmenite inlet flotation pulp; Step 3, performing primary flotation on the ilmenite floating ore pulp obtained in the step 2, wherein the flotation process comprises primary roughing operation and primary scavenging operation, roughing concentrate is ilmenite primary flotation concentrate, scavenging tailings are flotation tailings, and scavenging concentrate returns to ilmenite roughing operation; step 4, carrying out coarse-fine classification on the ilmenite primary flotation concentrate in the step 3, wherein a coarse-grain product is a titanium concentrate I, and a fine-grain product is an ilmenite secondary flotation raw material; and 5, performing secondary flotation on the ilmenite secondary flotation raw material in the step 4, wherein the secondary flotation comprises primary roughing and primary concentration operation, so as to obtain titanium concentrate II, the secondary roughing tailings are used as middlings and returned to the primary flotation roughing operation, the secondary primary concentration tailings are used as middlings and returned to the secondary flotation roughing operation, and the concentrate I and the concentrate II are combined into final ilmenite concentrate. The content of the granularity of-0.25 mm of the coarse-grain ilmenite floating raw material in the step 1 is more than or equal to 95%, the content of-0.075 mm accounts for 20-30%, the total content of ilmenite monomers and the rich living bodies in the coarse-grain ilmenite floa