Dry method red mud storage yard drainage method and apparatus having forced drainage function

Abstract

The invention relates to a method for a dry method red mud yard forced drainage and the equipment thereof belonging to the tailing piling technology field. The method comprises the following steps: injecting pressure gas from the yard bottom and enabling the red mud adhesive liquid to be compulsorily drained into a filter tube or the red mud surface using the gas pressure to establish a high gradient seepage field; generating a plurality of dispersion microcracks from below to above by pneumatic splitting effect so as to improve the permeance property of the piling red mud and the seepage consolidation efficiency of the red mud. The more closely the red mud approaches the bottom the lower the water content is because of the compulsory drainage of the pressure gas, which prevents the leakage of red mud adhesive liquid and reduces environment pollution, furthermore is beneficial to the self stability of the red mud yard and the latter use of the red mud. The compulsory drainage process is controlled automatically in all day and night without affection of weather, greatly reduces the human and mechanical workload such as broken of red mud surface crust and the mechanical turning, and simplifies the anhydration consolidation process of the red mud. The application of the invention is simple and the yard size and construction cost are both reduced with a great reduced anhydration consolidation period of the red mud.

Description

technical field [0001] The invention belongs to the technical field of tailings stockpiling, and relates to a drainage method in the field of dry process red mud stockyard construction engineering, in particular to a method with the function of forced drainage. Background technique [0002] Red mud, that is, alkaline red mud slurry, is the waste liquid flow with the largest discharge in alumina production, of which more than 90% are disposed and stored on land. Three strategic goals that the aluminum industry seeks to achieve in terms of waste disposal. Red mud is one of the main industrial waste residues that are harmful to the natural environment and difficult to use. Its attached liquid seeps into the land and easily causes land alkalization and groundwater pollution. People's long-term intake of these substances will inevitably affect their health. The world discharges about 60 million tons of red mud every year, and the stockpiling of red mud requires large infrastruct...

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Problems solved by technology

The main disadvantages of this technical solution are: 1) Although the slurry water-solid ratio of red mud is obviously smaller than that of wet storage technology, the water-solid ratio of wet storage red mud slurry is sometimes as high as (5-15): 1 , but due to the liquid attached to the upper layer of red mud and the infiltration of some rainwater, its water content is still relatively large, and even the saturation is as high as 100%, so the drainage effect needs to be further improved; 2) The drying and consolidation of red mud mainly adopts uniform The water permeability of the red mud itself is very poor (according to the core sampling analysis of the red mud storage of Shandong Aluminum Factory from May to August 1989 by the Xi'an Reconnaissance Institute, the red mud permeability coefficient is average. at 10 -7 cm / s~10 -8 m / s level, the greater the depth, the poorer the permeability), therefore, its drainage range is mainly limited to the surface layer of red mud or near the bottom water filter layer, and the drying and consolidation effect on the inside of red mud is small and the effect is poor; 3 ) Once the weather is cloudy and rainy for a long time, it will be difficult to dry and consolidate the red mud, which will definitely affect the storage capacity; 4) The drying and consolidation of the surface layer of the red mud will form a hard and thin shell (about 1-2 mm thick), which must be It needs to be regularly removed, and special machinery is needed to cooperate with the drying to achieve the drying purpose of its evaporation. It can be seen that the procedure of the red mud drying and consolidation method is complicated, and its manpower and mechanical workload are large; 5) the storage yard has strict requirements and requires leveling slope, so that the inclination of the slope is consistent, and the water filter layer must be laid on the anti-seepage layer, the construction process is complicated and time-consuming

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