West Ma Tianrun wide Titanium Industry Co., Ltd. is located in Bama County, western Guangxi region and our country more famous iron-titanium mineral resources, the region has been ilmenite by previous pre-check in the CAS - Submit medium-sized ilmenite bed Hirabayashi area In one place, there are many ilmenite spots in the vicinity. There has been a small-scale mining phenomenon. From the current geological data and the analysis of the development situation, the ilmenite in this area has a large prospecting. Potential and development prospects.
The mining area is located in the nuclear and northeast wing of the southeastern part of the Bama anticline in the eastern section of the 100-color fault-break zone in the west forest of the Guixi Depression in the South China. The area belongs to the subtropical monsoon climate zone. The rainy season is mostly concentrated from May to September. The rainfall is abundant and the temperature difference between day and night is large. The topography is mainly the hilly gentle slope, middle and low mountain composed of diabase and siliceous rock, mudstone and limestone. The terrain is mediumly cut and the vegetation cover is sparse and medium. The area has been connected to high-voltage power, and the production and living electricity is supplied by the Dahuayan large-scale hydropower station about 40km away from Bama County. The power is sufficient, and the telephone and mobile phones are basically popularized in the village. The local residents live in poverty and the surplus labor is sufficient.
The design of the production scale mining capacity 100t / d concentrate ilmenite (TiO 2 grade> 48%).
First, the nature of the ore
The new mining projects beneficiation plant mainly deal with the CAS - ilmenite sands ore Hirabayashi vicinity.
(1) Main chemical composition and ore density of raw ore
The ore sample is the residual of weathering migration, slope deposit sand, and the valuable component is mainly titanium. The analysis results of the main chemical components of the ore samples are shown in Table 1.
(2) Mineral composition of ore
Titanium-containing minerals ilmenite (accounting for 15.78%), rutile, titanium white, brookite, sphene, etc. (accounting for 1.45%), other metal minerals are goethite, goethite water, water erythro Iron ore, manganese ore, pyrite, etc. (accounting for 15.87%). The gangue minerals are illite, kaolinite, chlorite, halloysite, montmorillonite, quartz , feldspar , mica , pyroxene, amphibole, wollastonite , carbonate and other minerals (66.90%). .
(III) Calculation of the occurrence state and balance distribution of titanium
The titanium in the ore sample mainly exists in the state of ilmenite, followed by rutile, ilmenite, brookite, a small amount in the form of vermiculite, and some titanium dispersed in iron minerals and gangue. In minerals. The calculation results of the equilibrium distribution of titanium in the ore sample are shown in Table 2.
It can be seen from Table 2 that the titanium in the ore mainly exists in the form of ilmenite, followed by rutile, ilmenite, brookite, vermiculite, and 4.91% of titanium is dispersed in iron-manganese minerals. In the gangue minerals.
Calculated ilmenite theoretical grade TiO 2 56.36%, TiO 2 is the theoretical recovery of 94.83%.
(4) Particle size characteristics of titanium minerals
The measurement results of the grain size characteristics of titanium minerals are shown in Table 3.
It can be seen from Table 3 that the particle size of the titanium mineral is mainly -589+20 mm, and the particle size is coarse, which is favorable for recycling.
(5) Results of analysis of water content of mineral sample sieve and dissociation degree of titanium mineral monomer
In order to understand the distribution of titanium in each grade and the monomer dissociation of titanium minerals in the ore sample, the mineral sample was sieved and analyzed, and the monomer dissociation degree of titanium mineral was determined. The ore size composition and TiO 2 distribution rate are shown in Table 4. The results of monomer dissociation analysis of the ore are shown in Table 5.
It can be seen from the results in Table 4 that the titanium in the ore sample is mainly distributed below 0.8 mm, and the ore is immersed in water and sieved with a vibrating sieve, and the upper portion of the sieve can be discarded.
It can be seen from the results in Table 5 that the monomer dissociation degree of titanium minerals is 88.80%, the symbiotic body of titanium minerals and iron minerals accounts for 6.85%, and the connected bodies of titanium minerals and gangue minerals account for 4.35%. Since the monomer of titanium mineral dissociation is better, the ore sample does not need to be ground, and can be directly selected.
Second, the beneficiation test
In July 2007, we conducted exploratory experiments and optimization experiments on the mine. The best mineral processing process principle is shown in Figure 1. The test results are shown in Table 6.
Third, the beneficiation process design and equipment selection and configuration features
(1) Beneficiation process design
Because the original ore grade of the design is too different from the ore grade of the ore dressing test, the beneficiation process can not be directly used. The structure of the test process needs to be adjusted and optimized to maximize the compliance with the Bama ferrotitanium in Guangxi. The sorting characteristics of ore.
1. Basis for beneficiation process design
(1) According to the analysis of the ore properties, the ore can be directly sorted without crushing and grinding, so the process design has no fracture and grinding sections.
(2) Due to the concentrated particle size of the useful mineral ilmenite in the ore, mainly at -0.6+0.02mm, and there are many slime, the screening and grading and desliming operations must be carried out before the ore is sorted. By throwing off the tailings with a yield of about 17.33%, the desliming operation can throw away about 40.81% of the tailings, which not only reduces the number of subsequent equipment and load, but also saves a lot of infrastructure and equipment investment.
(3) Due to the limited construction site, the entrusting unit requested the construction of the roughing plant and the selected plant. The part before the shaker sorting operation was built as a roughing plant, and the shaker sorting operation was built as a selection plant. Therefore, the process flow is divided into two parts: rough selection process and selected process flow.
(4) The entrusting unit requires 48% of the final titanium concentrate (TiO 2 ) grade. In order to ensure that the concentrate grade meets the requirements, a spiral chute sweep and a shaker mine re-election are added during the design.
2. Determination of the beneficiation process
According to the requirements of the beneficiation test and the entrusting unit on the production index, the beneficiation process determines that the rough selection process is the raw ore-grading-de-sludge-crude selection process, and the selected process is coarse concentrate-mixing-shake Bed selection - medium mine re-election process (see Figure 2, Figure 3).
(II) Selection of major equipment
Screening and grading equipment : According to the mining method and ore properties of the ore, this design calculates the specification and treatment capacity of the cylindrical sieve required for the original ore screening according to the gold mining cylinder screen (washing cylinder). Due to the finer grain size of the titanium minerals in the ore, the higher grade titanium is mainly concentrated in -2+0.038mm. Therefore, the relationship between the ore size composition and the distribution ratio of TiO 2 is repeatedly studied, and the size of the sieve mesh in the production is considered. The effect of the efficiency and the amount of treatment is determined by using a double-layer cylindrical sieve with an inner sieve opening of 6 mm and an outer sieve opening of 1.5 mm. In addition, considering the change of ore properties, the load of the cylindrical sieve and the fluctuation range and operation of the cylinder. For other factors, it is more suitable to use two 1.8m×5.4m multi-purpose cylindrical sieves. For this mine, the machine has a maximum processing capacity of 546m 3 /h and can be equipped with an 11kW motor.
Spiral chute selection: The spiral chute is made of FRP, and the inner surface is coated with polyurethane wear-resistant layer. Widely used, ilmenite, chromite, pyrite, tin ore, tantalum and niobium ore, gold, coal mines, monazite, rutile, zircon, and other rare earth metal ore having a sufficient density difference Non-metallic minerals, as well as steel slag, sulfuric acid slag, metallurgical slag and other materials are sorted and recycled. The device has the advantages of simple structure, light weight, no power, water saving, convenient operation and maintenance, strong adaptability, fine granularity, large processing capacity and good sorting effect.
In order to make the equipment as large as possible and suitable for the process, 32 sets of spiral chutes with a diameter of 1.6m and a pitch of 800 and 3 heads/set were selected as the rough re-election equipment . The surface of the table surface is designed to have a single processing capacity of 8t/h; the coarse selection uses 8 grooved groove surfaces, and the designed single processing capacity is 9t/h; the sweeping selection is 8 grooved type. For the groove surface, the designed single processing capacity is 9t/h.
Select shaker: 6-S shaker is one of the main equipment of gravitational, widely used in sorting tungsten, tin, tantalum, niobium, iron, manganese, chromium, titanium, bismuth, lead, gold and other precious metals and rare metals Mines can also be used in coal mines. Can be used for rough selection, sweeping, selection and other different operations, sorting different grades such as coarse sand (0.5 ~ 2mm), fine sand (0.074 ~ 0.5mm), slime (0.02 ~ 0.074mm). In this design, a total of 11 LS (6-S) shakers were selected as the re-election equipment for the selected plants. Two of the coarse sand beds were used for the selection of coarse sands and the re-election of the selected mines. The processing capacity of the table is 1.5t/h; 6 sets of fine sand bed are used for fine sand selection and medium ore re-election after fine sand selection. The designed single processing capacity is 0.9t/h; the other 3 slimes The type of bed is used as a sorting slime, and the designed single processing capacity is 0.5t/h.
Selection of hydraulic grading equipment: The hydraulic grading equipment commonly used in grading operations before shaker re-election is a hydraulic grading box, which satisfies the requirements of rocker feeding size, ore volume and concentration. The hydraulic classification box is a free-falling classification device suitable for processing materials with a small particle size and a large fine mud content. A suitable graded particle size is 0.074 to 2 mm, and the ore concentration is 18% to 25%. The equipment has the advantages of simple structure, no power, reliable work, and is widely used in ore dressing plants such as tungsten and tin. When selecting the hydraulic classification box, it should be noted that the number of chambers in the classification box (usually connected in series of 4 to 8 classification boxes) corresponds to the number of material classification levels required by the process, and the number of shakers selected is also taken into account. The hydraulic classification box selected for the i-inch is 9 rooms, divided into 9 levels, corresponding to 9 shakers for the selection of coarse sand, fine sand and slime.
(3) Equipment configuration features
In terms of equipment configuration, simple equipment configuration is conducive to improving beneficiation efficiency, convenient operation and safe production.
1. The rough selection plant will arrange the spiral chutes in groups of four. This will save land and reduce capital construction investment, and create conditions for the daily operation, management and further improvement of the selection indicators.
2. The selection of the shaker bed is horizontally configured, and the base of the shaker is built on the ground plane instead of being built on a platform. Plane horizontal configuration can save height difference, reduce plant height, reduce capital construction investment, and reduce total investment. In addition, after horizontal configuration, all equipment is on one plane, making it easy for workers to operate and easy to manage; The fact that the foundation is built on the ground plane rather than on a platform increases production safety and equipment reliability. Due to the large vibration generated during the production of the shaker, if the foundation is built on the platform, it is easy to damage the foundation, which brings danger to the production and the reliability of the equipment is not guaranteed. In order to realize the slurry self-flow, some re-election plants will arrange the shaker according to the ladder. The foundation of the shaker is built on the platform. During the production, the vibration platform and foundation of the shaker are also shaken. The daily operation workers are afraid to approach the operation and bring the production. A lot of insecurity, the safety of daily operations workers can not be guaranteed, and the aftermath is endless.
Fourth, mineral processing design indicators
The main technical indicators of mineral processing design are shown in Table 7.
V. Conclusion
1. For a certain ilmenite ore in Guangxi, the research unit carried out a large number of ore dressing experiments and research work, which provided a sufficient basis for the design of a reasonable beneficiation process.
2. For the beneficiation process of Guangxi ilmenite ore, the design analyzed the test process, main equipment configuration and site construction site, adjusted and optimized the test process, and proposed to deal with a certain ilmenite ore in Guangxi. It is recommended to design the beneficiation process.
3. Under the premise of ensuring design indicators and process parameters, the equipment selection should be carried out reasonably, neither too large nor too small. In addition, equipment configuration based on topography and topography saves investment as much as possible.
4. The selection of modern new concentrator design, large-scale, high-efficiency energy-saving, safe and environmentally friendly, and simple maintenance of mineral processing equipment is particularly important.
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