published date: 01-19-2019
With the development of the economy and the massive consumption of resources, the mining industry is mainly faced with two major problems: the deepening of resource exploitation and the disaster of surface tailings waste rock. With the continuous development of tailings filling technology, the mining industry will face difficulties. It is better solved. The use of surface tailings for backfilling goaf can not only control the ground pressure problem of underground mining, but also solve the problem of surface tailings storage, and also save energy and reduce emissions and reduce surface environmental pollution. At the same time, tailings filling technology also has the advantages of improving production efficiency, increasing the recovery rate of ore resources, reducing the depletion rate of ore and increasing the economic benefits of enterprises. Therefore, mine filling technology is in non-ferrous metal mines, black mines and coal mines. Has been widely used.
At present, the high-concentration slurry filling technology of the whole tailings is to use the full tailings which are not subjected to the staged desilting as the filling material, and the whole tailings produced by the mine concentrating plant are prepared into a high-concentration slurry filling using a deep cone thickener. A new filling technology in the empty area is an important way to achieve safe and efficient mining without waste in the mine. In the absence of staged desliming of the tailings, the whole tailings slurry has a high mud content and a low permeability coefficient. In the process of dehydration, the discharge of fine mud materials should be avoided. Therefore, the difficulty of filling the high-concentration sand slurry with high concentration is mainly due to the sedimentation and dewatering of fine tailings. The high-end dewatering technology of the full tailings slurry becomes the full tailings. An important process and key technology of pulp. Flocculation sedimentation technology has been widely used in mine tailings concentration because of its convenience and operability. However, the flocculation sedimentation process is affected by the pH value, water ion content and tail of the suspension. The influence of the amount of electricity on the sand surface, the type and amount of flocculant, the way of addition, the concentration of the slurry and the temperature.
|time/min||clarified liquid height/mm|
|None||Clear/(g·t-1)||Sodium dodecylbenzene sulfonate/(g·t-1)||Polyacrylamide/(g·t-1)|
Effect of total tailings concentration
From the height curve of the clarification liquid, it can be seen that the height of the three kinds of clarified liquids changes rapidly: the change is faster in 0~10 min. During this period, the whole tailings are in the sedimentation stage, and the change is slow after 10 min. At this time, the whole tailings are compacted. Stage. For a specific whole tailings, the sedimentation characteristics of different concentrations of whole tailings are completely different under the action of a certain flocculant. By comparing the liquid level changes of the clear layer of different concentrations of the whole tailings slurry, the concentration The sedimentation rate and effect of 70% full tailings slurry is significantly better than the total tailings concentration of 68% and 72%.
Effect of flocculant species
The flocculation process is that the flocculant molecules accelerate the sedimentation by combining the dispersed tailings particles into relatively large flocs. When the alum is added to the whole tailings, the whole tailings particles in the measuring cylinder can be seen to be turbid, and the larger flocculated particles. Settling, but the interface of the clear layer is not obvious; while the addition of polyacrylamide or sodium dodecylbenzenesulfonate, the sedimentation rate of the whole tailings is obviously improved, and the turbidity of the clear layer is reduced.