At present, the grade of raw tungsten ore in the world is decreasing year by year. There are less and less easy-to-mining wolframite, while refractory scheelite and wolframite-scheelite intergrowth ore gradually occupy the main position. Therefore, Xinhai Mining strengthens the research on tungsten extraction process, and customizes the ideal tungsten extraction equipment according to the different types of tungsten ore, strives to improve the tungsten extraction efficiency and reduce the production costs.
Xinhai uses the sodium sulfide, cyanide and chromate to inhibit the associated sulfide minerals, and adopts the sodium silicate, tannin, sodium polyphosphate, chromate to inhibit the gangue minerals. Then, using the sodium silicate or sodium carbonate to adjust the pH value of the pulp to 9.5-10, and 11-12 for cleaning stage.
Xinhai adopts sodium silicate heating method, which means adding a certain amount of sodium silicate to low-grade coarse concentrate, heating up, cooking, stirring, dehydration and slurry mixing, then concentrating repeatedly. Finally, the high-grade tungsten concentrate can be obtained.
That is, the jigging gross sand is produced when the qualified ore is sent to multi-stage jigging after the vibrating screen. The coarse-grained jig tailings are sent to grinding mill for re-grinding, and the fine-grained jig tailings enter into multi-stage shaking table after the classifier, then the shaking table gross sand is produced. The shaking table tailings are sent to the tailings pond, and the middlings are returned for regrinding and re-separating, and the gross sand of jig and shaking table is sent to concentrating stage.
Concentrating: Xinhai adopts flotation-gravity separation combined process or flotation-gravity separation-magnetic separation combined process, and recovers the associated elements in the concentrating stage.
Through the coarse and fine-grained table flotation (flotation -shaking table combined method) and flotation to remove the sulphide ore, the sulphide ore of table flotation and flotation merges into the sulfide ore flotation separation. And the wolframite after table flotation and flotation becomes the wolframite concentrate by the gravity separation process. If there are scheelite and cassiterite in the wolframite concentrate, gravity separation-flotation or gravity separation-flotation-magnetic separation combined process can be adopted to separate wolframite concentrate, scheelite concentrate and tin concentrate.
Fine sludge treatment: Xinhai usually carries out desulfurization first, and then adopts gravity separation, flotation, magnetic separation, electric separation or combined process to recycle the tungsten ore according to the properties of fine sludge, and utilize the associated metal minerals at the same time.
For the extraction of tungsten from wolframite-scheelite intergrowth ore, especially the fine-grained wolframite-scheelite intergrowth polymetallic ore, Xinhai usually adopts the bulk flotation process.
Bulk flotation of sulfide ore - bulk flotation of wolframite and scheelite - heating and separation of scheelite - strong magnetic separation of scheelite tailings - gravity separation of wolframite;
Before: The original plant adopted crushing pre-separation-gravity separation-concentrating process, which resulted in the loss of a large amount of fine-grained tungsten minerals, high mineral processing cost and poor mineral processing indexes.
After: After making the careful research on the ore properties and processing technology, Xinhai decided to optimize the wolframite process, add fine slime processing technology, and finally get the better mineral processing indexes.
After the modification, the recovery of fine-grained wolframite was strengthened obviously, and the influence of fine slime on the wolframite separation was reduced, which obviously improved the recovery indexes and the economic benefit of the plant.
Xinhai has make class B design qualification, and set up mine design institute and mineral processing research institute. More than 200 professionals provide the technical support service for 70 kinds of ore.
Depending on its professional mineral processing EPC+M+O service, Xinhai has got the EU certification, and ISO9001:2015 quality management system certification, who is classified as the assured brand with advanced products and standard quality!
Xinhai has multiple patents technologies, more than 500 mineral processing plants spread among China, Southeast Asia, South America, Africa, Iran, Russia, Mongolia, North Korea and other places, and Xinhai has established multiple overseas offices around the world.
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A strain of silicon-activating bacteria was isolated from electrolytic manganese residue (EMR); identified as a species of Ochrobactrum by integrated microscopic morphological characteristics, biochemical index determination, and clone analysis (i.e., results of 16S rRNA sequence); and temporarily named as Ochrobactrum sp. T-07 (T-07). The optimal growth conditions of the strain T-07 were obtained as follows: temperature of 30C, initial pH of 7.0, shaking speed of 180 rev.min1, and loading volume of 100mL. In order to enhance its activation activity of silicon, T-07 went through the ultraviolet (UV) mutagenesis and nitrosoguanidine (NTG) mutagenesis breeding, and the mutant strain T-07-B with higher activity was obtained. Under the optimal fermentation condition (leaching time of 20days, temperature of 30C, initial pH of 7, pulp concentration of 5%, shaking speed of 180 rev.min1, and particle diameter of EMR 180m), the available silicon content in the supernatant reached 98.8mgL1, which was 2.4 times of the original strain T-07. Therefore, T-07 can be used as a good backup in developing biological silicon fertilizer for plants.
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This project is financially supported by the National Natural Science Foundation of China (51804354) and the Scientific Special of Central Higher Education Institutions (No. CZZ20003), which are greatly appreciated.
Lv, Y., Li, J., Chen, Z. et al. Species identification and mutation breeding of silicon-activating bacteria isolated from electrolytic manganese residue. Environ Sci Pollut Res 28, 14911501 (2021). https://doi.org/10.1007/s11356-020-10526-4