Scheelite Beneficiation Wastewater Recycling Process

Beneficiation wastewater reuse refers to the tailings water concentration plant to reach production after repeated use of the standard, it is an important index of the requirements of environmental protection in mineral processing plant. At present, most of the ore mines have a large amount of waste water and require a large amount of cost treatment. At the same time, there is also a shortage of water resources. Therefore, more and more concentrator plants are being used for wastewater reuse, but the effect obtained is not obvious.

In the scheelite beneficiation plant, the scheelite added a lot of water glass in the flotation process, resulting in tungsten flotation tailings is difficult for cleaning. In the prior art, most of mine in the process of mineral processing wastewater, by adding lime amounts of pulp cleaning, although the most soluble settlement, the water pH value of more than 12, the water returned as mineral flotation of scheelite is inhibited, which contains an excess of Ca²⁺ ions, and the adsorption activation of gangue minerals in the flotation process consumes a large amount of collector, cannot reuse.

Aiming at the problem of difficult treatment and high cost in the reuse of scheelite dressing wastewater, a tailings wastewater in Xintian Ling tungsten mine of Hunan has good sedimentation effect. So that the quality of water can be directly reused for the beneficiation of scheelite process, the process of low cost wastewater treatment, wastewater reuse rate is high, applicable to promote the use.

Process content is not complicated. The scheelite tailings wastewater pH adjusted to 7 to 8, followed by adding polyaluminum chloride and polyacrylamide, so that the scheelite tailings wastewater polyaluminium chloride concentration of 700 ~ 900g / m³, polypropylene amide concentration reached 3 ~ 9g / m³, mixed, aged to obtain a clear recovery solution; the resulting recovery solution as a solvent medium to return scheelite flotation process for repeated use.

Compared with the prior art, the above method has the following advantages: 1. The treatment process of scheelite beneficiation wastewater is simple, the treatment cost is low, and the effect is good; 2. The reuse rate of the wastewater is high, reaching 87%, and the scheelite tailing wastewater is reduced emissions, protecting the environment, saving dressing costs; 3. Wastewater treatment for scheelite beneficiation process, relative water concentration, concentration index increased, recovery after the use of return rate of 84.95%, compared with water selection, the beneficiation index has been improved. The recovery rate of ore dressing after the use of backwater has reached 84.95%, and it is 2.64% higher than that of clean water. After the acid leaching process, the scheelite concentrate of the wolframite concentrate obtained from the reused water beneficiation has reached the national level I level of the first class scheelite concentrate, and the economic benefit is obvious.

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