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Determine the nature of red mud and red mud seepage yard requirements

The normal growth of crops that can not be burned to death situation. Seepage control measures not been taken in the Red Mud on the environmental pollution is serious. The red mud and coexists with liquid, so the solution pH, with light metal 18 * 2 2005,[link widoczny dla zalogowanych], more than 12,5 of the red mud, hazardous waste dumps should be stacked requirements. The yard location and seepage measures, should be strictly in accordance with (hazardous waste landfill pollution control standards> (GB8598) for the design and construction, yard slope, the bottom layer should be impermeable, impervious layer permeability coefficient of less than 10I1cm / s is appropriate. The solution pH value of less than 12.5 with the red mud, shall be (general industrial solid waste storage and disposal site pollution control standards> (GB18599) of the \siting and environmental protection measures taken. This standard has been clearly pointed out: \permeability coefficient is less than the equivalent of a 1.0 �� 10 cm / s and 1.5m thick impermeable clay layer performance. \. At present aluminum production plant in China, Guangxi Branch of the red mud by dry stacking conveyor and the other five branches and piles of wet transportation. whether it is wet or dry stacked pile, is attached to red mud and liquid coexistence. So the design of Red Mud, we must consider the solution of red mud with pH value of the problem, when attached to more than 12.5 when the pH solution, according to hazardous waste landfill yard pollution control standards for environmental design . Of course,[link widoczny dla zalogowanych], by increasing the number of red mud washing and washing efficiency, with a pH value of solution can be reduced to 12.5 below, is not a hazardous waste dumps by the general industrial design of solid waste to the Field ��, the permeability coefficient can be relaxed to 1.0 �� 10 ~ cm / s, the construction yard can significantly reduce capital investment. decreased with solution pH values at the same time, but also improves the recovery of alkali, alkali consumption reduction process, which to some extent, reduce production costs and gain benefits . Therefore, by increasing the red mud washing efficiency, reduce with pH, is alkaline alumina plant to reduce pollution, wastage and control base, the right way to obtain the corresponding economic benefits. 4 Conclusion of the red mud of alumina production and discharge of leachate pH, less than 12.5, but greater than 10.0, fluorine content of less than 50mg / I, therefore red mud is a type �� general industrial solid waste. Red Mud different solution pH values, some of red mud in alumina plant with solution pH greater than 12.5, is a hazardous waste. because of red mud and with liquid coexistence, hazardous waste landfill should be required to adopt strict yard of red mud seepage control measures. with fluid pH value less than 12.5 red mud, the leaching solution pH value is greater than 10,[link widoczny dla zalogowanych], should be first class �� requirements for general industrial solid waste storage to process its storage site, to ensure that impermeable layer permeability coefficient is less than 1.0 �� 10 a cm / s. oxidation aluminum should be washed by improving the efficiency of red mud,[link widoczny dla zalogowanych], red mud as far as possible with solution pH value decreased to 12.5 below, in order to save Red Mud disposal costs, while reducing the production of alkali consumption. References: [1] National Environmental Protection Agency. industrial pollution control of industrial solid waste non-ferrous metal series [z] 1992 [2] Hang Peng. aluminum industry waste yard environmental impact prediction and prevention of [z] 1990.8 [3] Aluminum Corporation of China Henan Branch expansion of 70 million tons / year alumina project environmental impact report [R] .2003,7. [4] Pingguo Aluminum Company of alumina second phase of an environmental impact report (RI2000, 8. (Editor Wenjun) * Books News \Society Press. The book combines scientific and technological development of the industry, a more comprehensive introduction to the iron and its alloys in various fields of national economic conditions; described a variety of alloy surface treatment (focusing on the special surface treatment) method, and surface treatment specific applications and future directions. paper for homes in the iron deposits and surface treatment research,[link widoczny dla zalogowanych], design, production and other related scientific and technical personnel to read. book 40.00 yuan per copy (including postage). a textbook unit to be or individuals. Please contact with light metal editorial. Address: Shenyang City, Liaoning Province, No. 184 Heping North Street, telephone, fax :024 -23261062 PC: 110001 (Editorial Staff)

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