SU1253709A1 - Method of recovery of sands from waste mould and core resin compounds - Google Patents

Description

The invention relates to foundry, namely to methods for the regeneration of molding and core sands.

The purpose of the invention is to increase the efficiency of the regeneration process by creating biologically disposed solid sludges.

The essence of the invention lies in the fact that according to the method of regeneration of sands from spent molding and core resin mixtures, containing operations of magnetic separation, crushing, screening, removing films of a binder in an aqueous medium, classifying and drying sand, as well as smoothing sludge, the operation of removing binding films is carried out at

Drotya cultures from the Candida genus. They assimilate an organic solution of natural films and process them and multiply them in order to intensify the process of removing films from. grains of sand in the aquatic environment continuously supply air in the amount of 40 m per 1 ton of waste mix. It was established experimentally that the minimum concentration of microorganisms is 0.08% of the mass of the waste mixture loaded in the tank, and with an increase in the concentration of microorganisms more than 0.8%, the processing rate increases slightly, and the flow of aeration air (more than 40 m / m) and, accordingly, operating costs. After completion of the film removal procedure,

The pH of the aqueous medium is 4.0-4.5 and its temperature is 20 water-sand mixture (pulp) is added

Tour 36-38 ° С by treating the used mixture with 0.08-0.8%, based on the weight of the used mixture by a culture of yeast from the genus Candida and supplying 40 m of air to the aquatic environment for 1 ton of mixture.

An example. After knocking out, the spent resin mixture is subjected to magnetic separation, crushing in poVopHoro type crushers, screening to pump into a tank, containing a culture of yeast from the genus in an aqueous medium and parameters: pH 4, 0-4.5; T 36-38 ° C, necessary dp ensure the viability of the specified culture, microorganism yes

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on the classification, classified sand sugat and sent to the place of consumption (workshop; warehouse of molding materials). The remaining waste is subjected to disposal, which consists in dividing it into recycled water, forming a ruyppdo then an aqueous medium for operative removal of the binder films, to solid materials. The most important product, which is the introduction of the protein mass, is fully used as a feed additive for cattle. Thus, the proposed method, being inherently biotechnological, completely decides on the successful disposal of public waste.

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Order 4664/14 Circulation 757. - Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab. d 4/5

Production and printing company, Uzhgorod, st. Design,

Drotya cultures from the Candida genus. They assimilate an organic solution of natural films and process them and multiply them in order to intensify the process of removing films from. grains of sand in the aquatic environment continuously supply air in the amount of 40 m per 1 ton of waste mix. It was established experimentally that the minimum required concentration of microorganisms is 0.08% of the mass of the waste mixture loaded in the tank, and with an increase in the concentration of microorganisms more than 0.8%, the processing rate increases slightly, thus increasing the flow rate of aerating air (more than 40 m / t) and, accordingly, operating costs. After completion of the film removal procedure,

water-sand mixture (pulp) finish

on the classification, classified sand sugaat and sent to the place of consumption (workshop; warehouse of molding materials). The remaining waste is subjected to disposal, which consists of its separation into recycled water, then forms an aqueous medium for the operation of the binder films, solid It is a self-made product, which is a protein mass that is fully used as a feed additive for cattle. Thus, the proposed method, being inherently biotechnological, completely solves the problem of utilization of drinking waste.

Claims (1)

METHOD FOR REGENERATING SANDS FROM WASTE FORMING AND BAR · RESIN MIXTURES, including operations of magnetic separation, crushing, screening, removal, binder films in the aquatic environment, classification, drying of sand and utilization of sludge, characterized in that, with the aim of increasing the efficiency of the process to increase the efficiency of the regeneration process creating biologically utilizable solid sludge, the operation of removing binder films is carried out at a pH of 4.0+ aqueous medium. 4.5 and its temperature from 36 C to 38 ^e by treating the waste mixture 0,08-0,8Z by weight of the mixture of spent culture yeast of the genus Candida and supplying air into the aqueous medium in an amount of 40 m 'per 1 ton of the spent sme- cl m ,1 . 125