Comprehensive recovery test of polymetallic tailings in Shizhuyuan

The mine tailings is Shizhuyuan, after more than a metal flotation tailings after magnetic separation of fine particle size (80% -200 mesh) ore complex nature of valuable elements and more, causing great difficulties for sorting.

DETAILED Elemental analysis: 5% sulfur, 8.2% magnetic iron, 0.26% tungsten white, black 0.05% tungsten, 0.15% tin, 21% fluorite, (2.5% calcium carbonate)

First, the difficulties faced by multi-metal recycling

1. Valuable elements have lower grades and are classified as production grades, but only for each product can be recycled.
2. The inlay size is fine, tungsten, tin, fluorite in -200 mesh. When 80% is selected, some ore does not dissociate from the monomer, which has a great impact on the quality of the concentrate.
3. The separation of white tungsten and fluorite is very difficult. Generally, the conventional method uses float flotation first, and white tungsten and fluorite are difficult to separate. The white tungsten coarse concentrate is only 1.5% or less (including more than 70% of fluorite). The number of temperature selections is too large and the production cost is greatly increased. Secondly, a large amount of fluorite is taken away during the rough selection of white tungsten, and its own fluorite grade is only 21%, taking away about 7~8%. At the time of fluorite flotation, only 13 to 14% of the ore is selected, and it is difficult to float a qualified fluorite concentrate.
4. When the fluorite flotation stage is only 13%~14%. It is very difficult for fluorite to produce more than 94% of qualified products, and calcium carbonate is difficult to suppress.
5. Sulfur and iron must be recycled in advance, otherwise the quality of fluorite will be affected and harmful elements will exceed the standard.
6. From the small test to detect tailings, no tin, only fine particles of tungsten, tin, the recovery rate is very low.

Second, according to the above ore properties, after analysis, a large number of small tests were done.

1. First float the sulphur iron, then float the white tungsten, magnet and then concentrate the pulp and then float the fluorite. The tailings are best recovered with a heavy medium shaker for strontium tungsten and tin.
This method has the advantage that sulfur, iron, tungsten, tin, fluorite can be recovered comprehensively, and the recovery rate is high.
The disadvantage is the high production costs, equipment utilization is low, increasing the maintenance time, some fine mineral fluorite and quality selected recycled into stage Wujing affect adaptation.

2. Flotation of ferro-iron first, then magnet, and then using tin in advance with heavy medium, tungsten tailings are concentrated and then enter the fluorite flotation stage, and tungsten-tin is floated.
Advantages: Reduced costs, reduced equipment repair time, increased fluorite recovery and concentrate quality.
Disadvantages: reduced white tungsten recovery rate of about 20%

3. According to (2) test comparison, the first test plan is used for sorting.

1. Control concentration is about 40%, fineness - 200 mesh accounts for 100%. First, the sulfide minerals are floated. Since the ore agent has not disappeared, the drug removal method is gradually adopted: activated carbon, sodium sulfide. Then carry out flotation: butylamine black medicine, diced yellow medicine. After a rough sweep, two fine. Most of the sulfide ore can float out.

2. White tungsten flotation stage: a large number of fluorite must be restrained. The key point in this stage is the choice of inhibitors. After repeated small tests, the tungsten concentrate can reach 3~4% (including fluorite 50~60%). Adoption process: one grain of two fine three sweeps. Increase the amount of water glass to 2.8KG / ton. Inhibitors with six springs biasing sodium phosphate conjunction with tannic acid. Tailings can be controlled at 0.06~0.08%

3. The tungsten tailings enter the magnetic separation stage, and the first stage of the magnetic concentrate is used to magnetically concentrate the concentrate into the second stage with an 800 Gauss magnetic separator. 500 magnetic separator magnetic iron concentrate more than 53%.

4. The magnetic separation of mercury is sent to the concentration tank for dehydration and concentration, and the concentration of 35% is controlled to enter the fluorite flotation stage. The most important thing for fluorite flotation is how to activate fluorite and how to inhibit silica and calcium carbonate. When the original ore grade is not high. When the ore grade is not high, calcium carbonate is more difficult to suppress. Determine the process, one grain of two sweeping six essence, activator: lead nitrate, sucker: 731, oleic acid. Inhibitor; tannic acid, Liuquan sodium metaphosphate, dextrin.

Test: Five selections: fluorite: 94%, silica 0.8%, calcium carbide: 1.3% tailings: 3.6%

5. Finally, the tailings enter the heavy medium stage:

Due to the fine grain size of the ore, the recovery rate of the shaker is very low, the new technology carpet is used for recycling, and the medium and mine is recycled by flotation.

Argument: 1. After repeated comparison tests, it can be judged that the tailings have comprehensive recovery value, and the following qualified products can be selected: sulfur 35% magnet 53% white tungsten 40% fluorite 94% tungsten-tin mixed concentrate 20%

2. The first test scheme has better effect and higher recovery rate, among which 70% of fluorite recovery is higher in tungsten.

3. The tailings reserve is about 300,000 tons, and the tailings price is 20 yuan/ton lower. Production costs are not high 130 yuan / ton. Large processing volume and considerable profit

4. The biggest obstacle is the immature treatment of tailings technology. After repeated trials, the current technology is mature and the indicators are stable.

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