Method for treating tailing water from mineral processing plant by microwave

Abstract

The invention provides a method for treating iron ore site-selection tailing water by utilizing microwave, which comprises the following technical steps: tailing mash is sent to an adjusting tank for adjusting the concentration to 9-11 percent, then sent to a stirring tank with the flow of 160-292m<3> / h, and simultaneously quicklime is dosed into the tailing mash according to the dosing amount of 0.25-0.35kg / m<3>, the tailing mash is stirred at room temperature until the pH value is 10-14, a treatment agent is dosed into the tailing mash according to the dosing amount of 0.117-0.135L / m<3>, the tailing mash is stirred at room temperature until the pH value is 6-9, the tailing mash is sent to an industry microwave oven with the flow of 160-292m<3> / h, under the conditions of the power of 40-50kw and the frequency of 915 MHz, the tailing mash is treated for 1-2 seconds by the microwave and then sent to a turbidness tank for depositing for 240-300 minutes, overflow water is recycled, substrate sludge is sent to a tailing dam for placing. The method realizes the recycling of the tailing water, not only solves the problem of short water resources, but also avoids the potential safety hazard resulted from wet beaches and reduces the manufacture cost.

Description

technical field [0001] The invention relates to a method for treating tailings water in an iron ore dressing plant, in particular to a method for treating tailings water in an iron ore dressing plant by using microwaves, and belongs to the technical field of tailings water treatment. Background technique [0002] At present, the contradiction between supply and demand of water resources in my country is serious. Among the 640 cities in the country, there are more than 300 water-deficient cities, of which 114 are severely water-deficient cities, with a daily water shortage of 16 million tons and a direct economic loss of 200 billion yuan due to water shortage every year. Reduce grain production by 70-80 billion kg. It is predicted that in 2010, the total water supply in the country will be 620-650 billion m 3 , the corresponding total water demand will reach 730 billion m 3 , the gap between supply and demand is nearly 100 billion m 3 . [0003] Water is the lifeblood of...

AI Technical Summary

Problems solved by technology

At present, iron ore dressing plants are mostly located on mountains or hillsides where water is scarce. The water consumption of mineral processing is huge, and the loss of water is also extremely alarming. Long-distance pumping water replenishment not only requires a large investment and high cost, but also makes it difficult to provide sufficient water sources. In order to solve the primary problem that restricts mineral processing production, it is imminent to carry out research on the reuse of water resources

Especially after the implementation of the tailings re-processing project, the re-selected tailings always exist in the form of paste due to their fine particle size, heavy mud content, and slow sedimentation speed, so that they cannot form dry beaches after being discharged into the tailings pond, and instead Once the new tailings pond fails, it will cause catastrophic losses to the lives and property of people downstream in the reservoir area

Therefore, tailings with high water content and low concentration pose a threat to the safety of the new tailings pond. At the same time, it is difficult to recycle ore dressing water, let alone realize recycling.

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