CN-117399160-B - Short-process technology for enhanced separation of ilmenite

Abstract

The invention relates to a short-flow process for enhanced separation of ilmenite, and belongs to the technical field of mineral processing. The process flow comprises three steps of (1) carrying out a coarse-sweep flotation operation on ilmenite input and separation materials to obtain ilmenite flotation concentrate and flotation tailings, (2) carrying out acid pretreatment on the ilmenite flotation concentrate, carrying out solid-liquid separation after the acid pretreatment to obtain ilmenite acid pretreatment concentrate, and (3) carrying out a high-gradient strong magnetic separation one-time coarse-separation operation on the ilmenite acid pretreatment concentrate to obtain ilmenite final concentrate. The process has simple structure and high efficiency, and the acid pretreatment process is added in the ilmenite concentration process, so that heterogeneous agglomeration between ilmenite and gangue mineral particles can be weakened, high-efficiency collection of ilmenite can be enhanced by adopting high-gradient strong magnetic separation, high-grade and high-recovery-rate titanium concentrate is obtained, and the technical problem that fine-fraction ilmenite is difficult to recover is fully solved.

Inventors

• MENG QINGYOU
• YUAN ZHITAO
• DU YUSHENG
• FENG QUAN
• ZHANG QIANG

Assignees

• 东北大学
• 沈阳五寰工程技术有限公司

Dates

Publication Date

20260505

Application Date

20231116

Claims (10)

1. 1. The short-flow process for the enhanced separation of ilmenite is characterized by comprising the following process steps of: (1) Ilmenite flotation Preparing an ilmenite material subjected to flotation into ore pulp with the mass concentration of 30-40%, adding a flotation reagent to perform an ilmenite flotation process, wherein the flotation process comprises a roughing operation and a scavenging operation, roughing concentrate is ilmenite flotation concentrate, scavenging tailings are flotation tailings, and scavenging concentrate is returned to the ilmenite roughing operation; (2) Ilmenite flotation concentrate acid pretreatment Acid pretreatment is carried out on the ilmenite flotation concentrate, and solid-liquid separation is carried out after the acid pretreatment, so that ilmenite acid pretreatment concentrate is obtained; (3) Ilmenite acid pretreatment concentrate strong magnetic separation And (3) carrying out a high-gradient strong magnetic separation process on the ilmenite acid pretreated concentrate, wherein the high-gradient strong magnetic separation process comprises a primary roughing operation, the roughing concentrate is ilmenite final concentrate, and tailings are used as middlings and returned to the flotation roughing operation in the step (1).
2. 2. The short-flow process for enhanced separation of ilmenite according to claim 1, wherein in step (1), the size of the feed ilmenite material is-0.075 mm 80% or more.
3. 3. The short-circuit process for enhanced separation of ilmenite according to claim 1, wherein in step (1), the flotation reagent comprises pH adjuster, gangue mineral inhibitor carboxymethyl cellulose, ilmenite activator lead nitrate, ilmenite collector benzoic hydroxamic acid and sodium oleate combined collector, foamer 2# oil.
4. 4. The short-process for enhanced separation of ilmenite according to claim 1, wherein in the step (1), the pH of ilmenite roughing pulp is 7.5-8.0, and 60-90 g of carboxymethyl cellulose, 150-250 g of lead nitrate, 800-1000 g of a combined collector of benzoic hydroxamic acid and sodium oleate and 20-40 g of No. 2 oil are added per ton of the entering float ore.
5. 5. The short-process for enhanced separation of ilmenite according to claim 1, wherein in the step (1), the pH value of ilmenite scavenging slurry is 7.5-8.0, 100-150 g of lead nitrate, 400-500 g of a combined collector of benzoic hydroxamic acid and sodium oleate and 10-20 g of No. 2 oil are added per ton of the amount of entering float ore.
6. 6. The short-circuit process for enhanced separation of ilmenite according to claim 5, wherein in the combined collector of the benzohydroxamic acid and sodium oleate, the mass ratio of the benzohydroxamic acid to the sodium oleate is 50:1.
7. 7. The short-process for enhanced separation of ilmenite according to claim 1, wherein in the step (2), the acid pretreatment is to add sulfuric acid to treat the surface of ilmenite flotation concentrate, adjust the pH value of the ore pulp to 1.0-2.0, and adjust the line speed of pulp stirring to 2.0-3.0 m/s, and the stirring time is 20-30 min.
8. 8. The short-flow process for enhanced separation of ilmenite according to claim 1, wherein in the step (3), the high-gradient high-intensity magnetic separation process adopts a vertical-ring high-gradient magnetic separator, and no medicament is required to be added.
9. 9. The short-process for enhanced separation of ilmenite according to claim 8, wherein the background magnetic induction intensity of the vertical-ring high-gradient magnetic separator is 0.8-1.0 t, the medium is bar-shaped, and the diameter is 1.0 or 1.5mm.
10. 10. The short-process for enhanced separation of ilmenite according to claim 1, wherein in the step (3), the grade of the ilmenite final concentrate TiO 2 is 47.0 to 48.0%, and the recovery rate is 83.0 to 86.0%.

Description

Short-process technology for enhanced separation of ilmenite Technical Field The invention belongs to the technical field of mineral separation and comprehensive utilization, and particularly relates to a short-flow process for ilmenite reinforced separation. Background China has rich titanium resources, but the primary ilmenite reserves account for about 97 percent of the total titanium resources and are mainly reserved in vanadium titano-magnetite deposits. For the ores, a principle flow of 'firstly selecting iron and secondly selecting titanium' is generally adopted, and is limited by the development and utilization of iron ores and the titanium selecting technology, the comprehensive recovery rate of titanium resources is only about 22%, the comprehensive utilization rate is low, and serious waste of titanium resources is caused. Titanium resources in Panzhihua-Xichang areas in China are assigned to basic rock-superbasic rock mass, the ore composition is complex, titanium-containing silicate gangue minerals such as spodumene, chlorite, feldspar, sphene, olivine and the like are mostly contained in the titanium-containing material, the exposed elements on the surface of the titanium-containing material are very similar to the surface of ilmenite, the gangue minerals are easy to mud, the selectivity of flotation agents is poor, the mechanical inclusion phenomenon is serious, and the separation difficulty of ilmenite is increased. At present, the problems of long separation flow, large consumption of flotation agents, difficult control of concentrate grade, low recovery rate and the like commonly exist in the titanium separation process. Xu Xinbang and the like adopt a strong magnetic separation-floatation process aiming at ilmenite materials with the grade of 11.03 percent of TiO 2 to obtain titanium concentrate, wherein the floatation is a coarse four-fine one-sweep process, the grade of TiO 2 of the obtained titanium concentrate is 47.31 percent, and the recovery rate is 61.65 percent. Deng Bing and the like perform titanium separation research on vanadium titano-magnetite ores in Panxi area, a strong magnetic separation pre-enrichment and then flotation process is adopted, and the flotation process adopts a process of 'one roughing, four times of concentration and one scavenging', so that the grade and the operation recovery rate of the obtained titanium concentrate TiO 2 are 47.78% and 61.25% respectively. Yang Yaohui and the like carry out research on a strong magnetic separation and floatation combined process aiming at inclined plate dense overflow ores of certain Sichuan company, the floatation adopts a concentrated treatment and recleaning process of coarse ore, swept ore, hexamine and middling, and the grade of the obtained titanium concentrate TiO 2 is 47.41 percent and the recovery rate of floatation operation is 73.21 percent by matching with a self-developed dispersing agent. Therefore, how to strengthen the separation efficiency of ilmenite in the process flow is significant for improving the comprehensive recovery rate of ilmenite. In the earlier work, the invention CN 111744677B describes that adding an acid pretreatment process before ilmenite is beneficiated, which can enlarge the difference of the floatability of ilmenite and silicate gangue minerals, which is essentially that the elution amount of metal ions on the surface of the gangue minerals is larger than that of ilmenite, the acid treatment is easy to desorb the hydrophobic membrane on the surface of the gangue minerals, so that the acid treatment can weaken the heterogeneous agglomeration between ilmenite and gangue minerals, and has the effects of cleaning and strengthening dispersion on ilmenite agglomerates, which is helpful for efficiently sorting ilmenite in the beneficiation process. Therefore, the invention provides a short-flow process for the enhanced separation of ilmenite, and the separation recovery rate of ilmenite is improved by accurately collecting ilmenite through strong magnetic field force after the surface acid treatment of the flotation rough concentrate. Disclosure of Invention In order to solve the technical problems, the invention provides a short-flow process for enhanced separation of ilmenite. The method adopts acid pretreatment to carry out surface treatment on ilmenite flotation concentrate, can reduce heterogeneous agglomeration of the ilmenite and silicate gangue mineral particles which are induced to be hydrophobized, and simultaneously promotes in-phase agglomeration of the ilmenite, so that the ilmenite separation efficiency is obviously improved. A short-flow process for enhanced separation of ilmenite, comprising the following process steps: (1) Ilmenite flotation Preparing an ilmenite material subjected to flotation into ore pulp with the mass concentration of 30-40%, adding a flotation reagent to perform an ilmenite flotation process, wherein the flotation process comprises a roughing opera