Recycling method of saponified water and aluminum-containing sludge

Abstract

The invention discloses a resource recycling method of saponified water and aluminum-containing oil sludge, which is characterized in that it comprises the following steps: (1) pretreatment of saponified water to remove oil and surfactant therein; (2) saponification after step (1) pretreatment Add water, hydrochloric acid and aluminum-containing sludge into the reaction vessel. After the reaction, the upper layer in the reaction vessel is the crude product oil, and the lower layer is the crude product of polyaluminum chloride solution; ③ purify the polyaluminium chloride solution obtained in step ②; ④ obtain in step ② The crude oil is purified to obtain the refined oil. The method of step-by-step treatment in the present invention not only enables oil products to be recovered by category, but also has a relatively low cod content in the saponified water after treatment, so that the purity of the polyaluminum chloride solution obtained by the reaction is relatively high.

Description

technical field

[0001] The invention discloses a resource recycling method for saponified water and aluminum-containing oil sludge. Background technique

[0002] Machinery processing, cable production and other industries produce a large amount of saponified water and aluminum-containing sludge in the production process.

[0003] Saponified water is a kind of oily wastewater, and the emulsified oil accounts for about 8% to 12% of the total water. Due to the influence of surfactants, the emulsified oil is stably dispersed in water in the form of oil-in-water, and it is difficult to achieve oil-water separation without special treatment. At the same time, the main suspended solids contained in the saponified water are aluminum oxides, and the clear particles are small, making it difficult to effectively settle and separate them.

[0004] Sludge is produced in the largest amount in the cable industry and mainly contains oil and aluminum. Among them, the sludge produced by al...

Examples

Embodiment 1）

[0028] The resource recovery method of the saponified water and aluminum-containing oil sludge of the present embodiment comprises the following steps:

[0029] ① Pretreatment of saponified water to remove oil and surfactants.

[0030] The saponification water comes from the production process of aluminum ingots and aluminum rods. The waste produced in the production process is put into layers and is divided into aluminum-containing sludge, saponification water, and mixed oil from bottom to top. The uppermost layer of mixed oil is extracted and stored, and the saponified The water is pumped out and stored for treatment, and the lowest layer of aluminum-containing sludge is stored. The COD value in the saponified water processed by this embodiment is 2*10 5 mg / L.

[0031] Let the saponified water stand for 3 to 5 hours, the water and oil are separated, and the upper oil phase (mainly engine oil and butter) is taken out for storage to complete the primary oil-water separation....

Embodiment 2）

[0045] The resource recovery method of the saponified water and aluminum-containing oil sludge of the present embodiment comprises the following steps:

[0046] ① Pretreatment of saponified water to remove oil and surfactants. The treatment mode of saponification water is the same as embodiment 1.

[0047] ② Add 5t of 10% to 16% hydrochloric acid and 1.5t of aluminum-containing sludge to 10t of saponified water treated in step ①. The aluminum-containing sludge is produced in the production process of aluminum ingots and rods, and contains about 50% Al and 35% butter , 15% water.

[0048] In this step, attention should be paid to ensuring excessive hydrochloric acid, and the pH value of the polyaluminum chloride solution after the reaction is 3.5-5.

[0049] After the reaction, the upper layer in the reaction vessel is the crude product of butter, and the lower layer is the crude product of polyaluminum chloride solution; the crude product of butter and the crude product of p...

technical field

[0001] The invention discloses a resource recycling method for saponified water and aluminum-containing oil sludge. Background technique

[0002] Machinery processing, cable production and other industries produce a large amount of saponified water and aluminum-containing sludge in the production process.

[0003] Saponified water is a kind of oily wastewater, and the emulsified oil accounts for about 8% to 12% of the total water. Due to the influence of surfactants, the emulsified oil is stably dispersed in water in the form of oil-in-water, and it is difficult to achieve oil-water separation without special treatment. At the same time, the main suspended solids contained in the saponified water are aluminum oxides, and the clear particles are small, making it difficult to effectively settle and separate them.

[0004] Sludge is produced in the largest amount in the cable industry and mainly contains oil and aluminum. Among them, the sludge produced by al...

Examples

Embodiment 1）

[0028] The resource recovery method of the saponified water and aluminum-containing oil sludge of the present embodiment comprises the following steps:

[0029] ① Pretreatment of saponified water to remove oil and surfactants.

[0030] The saponification water comes from the production process of aluminum ingots and aluminum rods. The waste produced in the production process is put into layers and is divided into aluminum-containing sludge, saponification water, and mixed oil from bottom to top. The uppermost layer of mixed oil is extracted and stored, and the saponified The water is pumped out and stored for treatment, and the lowest layer of aluminum-containing sludge is stored. The COD value in the saponified water processed by this embodiment is 2*10 5 mg / L.

[0031] Let the saponified water stand for 3 to 5 hours, the water and oil are separated, and the upper oil phase (mainly engine oil and butter) is taken out for storage to complete the primary oil-water separation....

Embodiment 2）

[0045] The resource recovery method of the saponified water and aluminum-containing oil sludge of the present embodiment comprises the following steps:

[0046] ① Pretreatment of saponified water to remove oil and surfactants. The treatment mode of saponification water is the same as embodiment 1.

[0047] ② Add 5t of 10% to 16% hydrochloric acid and 1.5t of aluminum-containing sludge to 10t of saponified water treated in step ①. The aluminum-containing sludge is produced in the production process of aluminum ingots and rods, and contains about 50% Al and 35% butter , 15% water.

[0048] In this step, attention should be paid to ensuring excessive hydrochloric acid, and the pH value of the polyaluminum chloride solution after the reaction is 3.5-5.

[0049] After the reaction, the upper layer in the reaction vessel is the crude product of butter, and the lower layer is the crude product of polyaluminum chloride solution; the crude product of butter and the crude product of p...