An article explaining the ore beneficiation process of wolframite and scheelite!

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There are more than 20 types of tungsten that have been released in nature, but only two types of scheelite and wolframite are valuable for mining. my country’s wolframite and scheelite tungsten ores are widely distributed, but their content is low. , found in almost all types of rock minerals. Overall, if you want to obtain ideal tungsten concentrate, you need to achieve enrichment through effective processing technology.

In terms of enrichment methods, wolframite and scheelite have different mineral processing and enrichment methods due to their different mineral properties. The flotation method is mainly used for scheelite, while scheelite Tungsten ore is mainly coarse-grained, so gravity separation is often used as a beneficiation and enrichment method.

Whether it is scheelite or wolframite, its mineral properties are complex. Single flotation or gravity separation cannot completely obtain high-quality tungsten concentrate. In some cases, it is necessary to complete the separation and enrichment through a joint beneficiation method. . Below we introduce the mineral processing methods of scheelite and wolframite respectively.

1. Scheelite beneficiation process

Sceeley ore is mostly composed of veinlet disseminated type-greytzite skarn composite type. Mainly, minerals are often associated or symbiotic with non-ferrous metals such as molybdenum and bismuth. The mineral particles are fine and disseminated in the ore. Depending on the thickness of the embedded cloth particles, gravity separation or flotation can be used for sorting.

1. Gravity separation process of scheelite

Generally, for scheelite with coarser particle size, tungsten concentrate can be obtained directly by gravity separation. When scheelite When the mineral phase density is in the range of 5.8 to 6.2, it is quite different from the density of gangue minerals, and can be sorted by methods such as shaking tables, jigs or chutes.

2. Scheelite flotation process method

Scheelite is different from wolframite in that it has good Natural floatability, but due to the difference in particle size, two processes of rough selection and selection are required.

Sceelite roughing:The lime method is often used, first using Ca²⁺ adsorption on the surface of the gangue mineral to change the potential on the surface of the gangue mineral, and then add Na₂CO₃ to precipitate Ca on the surface of the gangue mineral, and the scheelite surface also It adsorbs Ca, but its surface charge remains unchanged and remains negatively charged, and does not produce CaCOs precipitation. Therefore, adding inhibitors such as water glass only inhibits gangue minerals and has no effect on scheelite, thereby achieving the separation of tungsten ore and gangue minerals.

Sceeel beneficiation:There are two methods of normal temperature selection and heating selection at this stage. Among them, the normal temperature method is not very adaptable to the ore, and the selection index fluctuates. The scheelite concentrate is generally recovered with a grade of 55% to 60%; the heating method first concentrates the roughly separated concentrate. When the slurry concentration is in the range of 60% to 70%, add an appropriate amount of water glass to the slurry and heat it at high temperature. Stir at high temperature, then dilute the slurry, and then perform flotation at room temperature to obtain scheelite concentrate.

II. Wolframite beneficiation process

Wolframite is different from scheelite. This type of mineral is mostly quartz vein or fine vein type deposits with coarser grain size. , the separation difficulty is low, and the ideal wolframite concentrate can usually be obtained by gravity separation. According to past experience, the beneficiation method of wolframite is mostly a combined gravity separation method, and the process is roughly as follows: roughing-gravity separation Select-Select-Fine Mud ProcessingSeveral parts.

Rough selection of wolframite ore:The rough selection section is mainly hand-selected. Minerals are identified through naked eyes, and tungsten ore is selected by hand or hand tools, or gangue minerals are separated. Choose, two methods.

Gravity separation of wolframite ore: Gravity separation generally requires multi-stage jigging - multi-stage shaker - medium ore return and regrinding process, and the finely crushed minerals are subjected to multi-stage vibration Sieve for classification, and the obtained coarse, medium and fine-grained minerals are separately subjected to shaking table re-selection, and the minerals in the shaking table are returned to the grinding table for re-grinding and re-selection. The obtained products enter the selection operation together, and the tailings enter the tailings pond.

Wolfertungsten ore beneficiation:The beneficiation section often adopts flotation-gravity separation (gravity-flotation Selection) combined process flow, and the associated elements are recycled in the selection section. The process is: remove sulfide ore through coarse and fine particle flotation and mechanical flotation, merge the sulfide ore into sulfide ore flotation separation, and further produce black tungsten concentrate through gravity separation. ore, if the wolframite concentrate contains scheelite or cassiterite, the wolframite concentrate and scheelite concentrate will be selected through a combined process such as gravity separation-flotation or gravity-flotation-magnetic separation (electric separation). and tin concentrates.

Black tungsten fine mud treatment: Generally, it is treated separately, desulfurized first, and then recycled through a separation process (gravity separation, flotation, magnetic separation, electric separation or combined process) Useful elements present in fine mud.

The above is an introduction to the scheelite beneficiation method and the wolframite beneficiation process. In the actual beneficiation process , neither wolframite nor scheelite are the same ores and cannot be generalized. In order to obtain an ideal return on investment, it is recommended to conduct a mineral processing test first, and through test analysis, design a suitable tungsten ore mineral processing process plan and complete set of Tungsten ore beneficiation equipment.