A porous adsorption medium for water treatment and its preparation method

Abstract

The invention discloses a porous adsorption medium for water treatment. The porous adsorption medium is prepared from the following raw materials in parts: 70-80 parts of silica sand casting regenerated ash, 5-15 parts of sludge, 5-15 parts of coal ash, 0-10 parts of activated carbon and 5-10 parts of straws or stem plant broken materials. The porous adsorption medium provided in the invention is hard, has the specific gravity of more than 1, is completely sunk into the bottom, is high in porosity and large in specific surface area and suitable for serving as biological stuffing (such as a filling body in a biofilter) in an environmental water treatment technology. Wastes are fully utilized, the porous adsorption medium is successfully applied to environmental protection and management, the waste is changed into a valuable material, and a great contribution is made to beautifying the ecological environment.

Description

technical field

[0001] The invention relates to the field of water treatment materials, in particular to a porous adsorption medium for water treatment and a preparation method thereof. Background technique

[0002] As we all know, there are more than 25,000 foundry enterprises in my country, and the output of castings has ranked first in the world for many years. Among them, silica sand casting accounts for most of the foundry industry, about 80% to 90%. The recycling and regeneration of waste silica sand will produce a large amount of regeneration. Most enterprises mainly discard ash, which is a great waste of recycled ash resources and will cause serious environmental pollution. The utilization of silica sand casting regenerated ash can not only realize the recycling of resources, but also help to protect and control the environment, thereby contributing to the society and benefiting mankind. Therefore, the utilization of silica sand casting regenerated ash has become an ...

Examples

Embodiment 1

[0028] Ingredients: 75kg of silica sand casting regenerated ash, 10kg of sludge, 10kg of fly ash, 5kg of activated carbon, and 8kg of the mixture of straw and stem and leaf plant debris. Among them, the sludge is taken from the excess sludge discharged from the sewage biological treatment system of a sewage treatment plant in Beijing; the mesh number of the fly ash is 45000-45500 mesh, the fineness is 0.03-0.05mm, and the loss on ignition is not greater than 10%, straw and stem and leaf plant debris pass through a 30-40 mesh sieve.

[0029] The porous adsorption medium described in this embodiment is prepared by the following preparation method:

[0030] (1) Screen the regenerated ash of 3 μm to 20 μm from the dust collection device of the silica sand regeneration equipment;

[0031] (2) Ingredients, weigh 75kg of silica sand casting regenerated ash, 10kg of sludge, 10kg of fly ash, 5kg of activated carbon and 8kg of the mixture of straw and stem and leaf plant debris, mix an...

Embodiment 2

[0037] Ingredients: 70kg of regenerated silica sand casting ash, 5kg of sludge, 5kg of fly ash and 5kg of straw.

[0038] The porous adsorption medium described in this embodiment is prepared by the following preparation method:

[0039] (1) Screen the regenerated ash of 3 μm to 20 μm from the dust collection device of the silica sand regeneration equipment;

[0040] (2) Ingredients, weigh 70kg of silica sand casting reclaimed ash, 5kg of sludge, 5kg of fly ash and 5kg of straw, mix and grind;

[0041] (3) Add water to the mixed raw materials, and granulate through a spray granulation tower;

[0042] (4) calcining the wet granules; preheating and calcining at 500 °C for 20 minutes, and then high-temperature roasting at 1100 °C for 1 h;

[0043] (5) After the furnace is cooled, and the finished product is classified and screened, the porous adsorption medium is obtained.

[0044] The relevant parameters of the porous adsorption medium obtained in this example are: the relati...

Embodiment 3

[0046] Ingredients: 80kg of silica sand casting regenerated ash, 15kg of sludge, 15kg of fly ash, 10kg of activated carbon and 10kg of stem and leaf plant scraps.

[0047] The porous adsorption medium described in this embodiment is prepared by the following preparation method:

[0048] (1) Screen the regenerated ash of 3 μm to 20 μm from the dust collection device of the silica sand regeneration equipment;

[0049] (2) Ingredients, weigh 80kg of silica sand casting reclaimed ash, 15kg of sludge, 15kg of fly ash, 10kg of activated carbon and 10kg of stem and leaf plant debris, mix and grind;

[0050] (3) Add water to the mixed raw materials, and granulate through a spray granulation tower;

[0051] (4) calcining the wet particles; preheating and calcining at 600°C for 45 minutes, and then at 1200°C for 2h at high temperature;

[0052] (5) After the furnace is cooled, and the finished product is classified and screened, the porous adsorption medium is obtained.

[0053] The ...

technical field

[0001] The invention relates to the field of water treatment materials, in particular to a porous adsorption medium for water treatment and a preparation method thereof. Background technique

[0002] As we all know, there are more than 25,000 foundry enterprises in my country, and the output of castings has ranked first in the world for many years. Among them, silica sand casting accounts for most of the foundry industry, about 80% to 90%. The recycling and regeneration of waste silica sand will produce a large amount of regeneration. Most enterprises mainly discard ash, which is a great waste of recycled ash resources and will cause serious environmental pollution. The utilization of silica sand casting regenerated ash can not only realize the recycling of resources, but also help to protect and control the environment, thereby contributing to the society and benefiting mankind. Therefore, the utilization of silica sand casting regenerated ash has become an ...

Examples

Embodiment 1

[0028] Ingredients: 75kg of silica sand casting regenerated ash, 10kg of sludge, 10kg of fly ash, 5kg of activated carbon, and 8kg of the mixture of straw and stem and leaf plant debris. Among them, the sludge is taken from the excess sludge discharged from the sewage biological treatment system of a sewage treatment plant in Beijing; the mesh number of the fly ash is 45000-45500 mesh, the fineness is 0.03-0.05mm, and the loss on ignition is not greater than 10%, straw and stem and leaf plant debris pass through a 30-40 mesh sieve.

[0029] The porous adsorption medium described in this embodiment is prepared by the following preparation method:

[0030] (1) Screen the regenerated ash of 3 μm to 20 μm from the dust collection device of the silica sand regeneration equipment;

[0031] (2) Ingredients, weigh 75kg of silica sand casting regenerated ash, 10kg of sludge, 10kg of fly ash, 5kg of activated carbon and 8kg of the mixture of straw and stem and leaf plant debris, mix an...

Embodiment 2

[0037] Ingredients: 70kg of regenerated silica sand casting ash, 5kg of sludge, 5kg of fly ash and 5kg of straw.

[0038] The porous adsorption medium described in this embodiment is prepared by the following preparation method:

[0039] (1) Screen the regenerated ash of 3 μm to 20 μm from the dust collection device of the silica sand regeneration equipment;

[0040] (2) Ingredients, weigh 70kg of silica sand casting reclaimed ash, 5kg of sludge, 5kg of fly ash and 5kg of straw, mix and grind;

[0041] (3) Add water to the mixed raw materials, and granulate through a spray granulation tower;

[0042] (4) calcining the wet granules; preheating and calcining at 500 °C for 20 minutes, and then high-temperature roasting at 1100 °C for 1 h;

[0043] (5) After the furnace is cooled, and the finished product is classified and screened, the porous adsorption medium is obtained.

[0044] The relevant parameters of the porous adsorption medium obtained in this example are: the relati...

Embodiment 3

[0046] Ingredients: 80kg of silica sand casting regenerated ash, 15kg of sludge, 15kg of fly ash, 10kg of activated carbon and 10kg of stem and leaf plant scraps.

[0047] The porous adsorption medium described in this embodiment is prepared by the following preparation method:

[0048] (1) Screen the regenerated ash of 3 μm to 20 μm from the dust collection device of the silica sand regeneration equipment;

[0049] (2) Ingredients, weigh 80kg of silica sand casting reclaimed ash, 15kg of sludge, 15kg of fly ash, 10kg of activated carbon and 10kg of stem and leaf plant debris, mix and grind;

[0050] (3) Add water to the mixed raw materials, and granulate through a spray granulation tower;

[0051] (4) calcining the wet particles; preheating and calcining at 600°C for 45 minutes, and then at 1200°C for 2h at high temperature;

[0052] (5) After the furnace is cooled, and the finished product is classified and screened, the porous adsorption medium is obtained.

[0053] The ...

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