SPENT EMULSIVE LUBRICATING-COOLING LIQUIDS DECOMPOSITION METHOD Russian patent published in 2005 - IPC

FIELD: purification of industrial sewage containing finely dispersed colloid organic and mineral impurities.

SUBSTANCE: the invention is dealt with the field of decomposition of the spent emulsive lubricating-cooling liquids (LCL) and may be used for purification of the spent industrial sewage containing the finely dispersive colloid organic and mineral impurities. The mode of decomposition of the LCL provides for introduction of the phosphoric acid into the LSS at stirring of the mix up to pH 2-3. Then the solution is heated up to the temperature of 65-80°C and after settling and removal of a lubricated phase, urotropine is added in the purified water phase at stirring and they exercise electrocoagulation of the partially purified water phase before production of a purified water phase. Then the product of treatment with the LSS is neutralized to meet parameters of maximum permissible concentration (MPC) for the sewage. The method ensures an increased level of purification the spent emulsive lubricating-cooling liquids from organic and mineral impurities at the expense of an increased duration of an effective functioning of the electrocoagulators.

EFFECT: the invention ensures an increased level of purification of the spent emulsive lubricating-cooling liquids from organic and mineral impurities due to an increased duration of an effective functioning of the electrocoagulators.

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