Method for preparing polysilicate iron flocculating agent from iron-containing heave metal sludge, and recycling treatment method of heavy metal sludge

A technology of heavy metal sludge and polyferric silicate, applied in water/sludge/sewage treatment, flocculation/sedimentation water/sewage treatment, sludge treatment, etc. The effect is not good, the processing process is complicated, etc., to achieve the effect of convenient resource utilization, solving resource problems, and simple process flow

Active Publication Date: 2017-10-03
NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA
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Problems solved by technology

[0009] Aiming at the problems of high cost of heavy metal sludge treatment, large energy consumption, complicated treatment process, high cost of preparing polysilicate ferric silicate flocculant, complicated preparation process, and poor effect of the obtained flocculant, the present invention provides an iron-containing heavy metal In order to overcome the deficiencies in the p...

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  • Method for preparing polysilicate iron flocculating agent from iron-containing heave metal sludge, and recycling treatment method of heavy metal sludge
  • Method for preparing polysilicate iron flocculating agent from iron-containing heave metal sludge, and recycling treatment method of heavy metal sludge
  • Method for preparing polysilicate iron flocculating agent from iron-containing heave metal sludge, and recycling treatment method of heavy metal sludge

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Embodiment 1

[0041] A preparation method of polysilicate ferric silicate flocculant taking iron-containing heavy metal sludge as raw material comprises the following steps:

[0042] (1) According to the mass ratio of industrial waste acid and heavy metal sludge (4-6):1, add industrial waste acid to the heavy metal sludge, after dissolving the heavy metal sludge, adjust the pH to 6.0-6.5, in the solution Add sulfide to the sludge to make heavy metal cadmium and lead ions in the sludge become complex precipitates, and the solution after solid-liquid separation is used as a flocculant preparation solution. The industrial waste acid is one of waste hydrochloric acid, waste sulfuric acid, and waste nitric acid. One or two or more kinds of sulfides are N,N-dimethylcarbamodithioformate, N,N-diethylcarbamodithiocarbamate or their derivatives. The ratio of the amount of substance of lead and cadmium to the amount of total substance of lead and cadmium is (4~5):1 for calculation;

[0043] (2) Add a...

Embodiment 2

[0066] The operation steps of this embodiment 2 are basically the same as that of embodiment 1, the difference is that:

[0067] In this embodiment 2, in order to process 1t of heavy metal sludge (each heavy metal content is total iron 460kg, lead 6kg, cadmium 2kg), use 4t waste sulfuric acid to dissolve in step (1), add 14kg N,N-dimethylamino Sodium dithioformate; Supplement ferrous chloride tetrahydrate solid 321kg in the step (2), make the total iron content in the solution account for the mass fraction of the solution after treatment to be 9%; Add 100kg sodium silicate nonahydrate in the step (3) With 145kg sodium chlorate, the feeding time is 60min, and the stirring speed is 350r / min; Potassium hydroxide is added in the step (4), and the basicity is adjusted to 15%; the rotating speed of the agitator is 350r / min in the step (5), The stirring reaction time is 90min, the standing aging time is 18h, and the density of the aging liquid obtained is 1.40g / cm 3 .

[0068...

Embodiment 3

[0082] The operating steps of this embodiment 3 are basically the same as those of embodiment 1, the difference being:

[0083] In this embodiment 3, in order to process 1t of heavy metal sludge (each heavy metal content is total iron 600kg, lead 6kg, cadmium 1.8kg), use 5t waste nitric acid to dissolve in step (1), add 17kg N,N-diethyl Sodium carbamate; Supplement ferrous chloride tetrahydrate solid 360kg in the step (2), make the total iron content in the solution account for the mass fraction of the solution after treatment to be 9.5%; Add 90kg silicic acid nonahydrate in the step (3) Sodium and 172kg sodium chlorate, feed time is 60min, and stirring speed is 450r / min; Add sodium hydroxide and potassium hydroxide in step (4), regulate salinity to 30%; The rotating speed of stirrer in step (5) is 450r / min, the stirring reaction time is 120min, the standing aging time is 24h, and the density of the aging solution obtained is 1.55g / cm 3 .

[0084] The performance index...

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Abstract

The invention discloses a method for preparing polysilicate iron flocculating agent from iron-containing heave metal sludge, and a recycling treatment method of the heavy metal sludge, and belongs to the technical field of environmental protection. The preparation method comprises the following steps: dissolving the heavy metal sludge by using waste acid liquid, and adding sulfide to remove cadmium and lead ions from the solving liquid to obtain complexing precipitate and iron-containing flocculating agent preparation liquid; treating the complexing precipitate by an ammonia leaching method to obtain cadmium-containing ammonia leaching liquid and ammonia leaching residue, adding sulfide into the ammonia leaching liquid to obtain cadmium sulfate precipitate, and taking the ammonia leaching residues as lead coarse ore; supplementing ferrous chloride for the iron-containing flocculating agent preparation liquid, adding sodium silicate and sodium chlorate, completely mixing, adjusting the basicity, carrying out reaction, allowing standing still and curing to obtain curing liquid, and then obtaining the polysilicate iron flocculating agent. The flocculating agent prepared by the method is good in treatment effect, high in settling velocity, small in use amount and simple in production flow, can realize reduction, harmlessness and recycling of the heavy metal sludge, and has good economic benefit and environmental benefit.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and more specifically relates to a preparation method of a polysilicate ferric silicate composite flocculant using iron-containing heavy metal sludge as a raw material and a resource treatment method of heavy metal sludge. Background technique [0002] With the rapid development of my country's economy, the heavy metal-containing sludge produced by industrial enterprises in the production process has become a difficult problem. The direct treatment of sludge has problems such as high treatment cost and large energy consumption, and it is impossible to recycle the heavy metal elements after treatment. Chemical disposal, resulting in a large amount of waste of heavy metal elements; by dissolving heavy metal-containing sludge with industrial waste acid, using sulfide precipitation to treat the solution, and then separating the precipitated complex precipitate, and finally separating t...

Claims

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Application Information

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IPC IPC(8): C02F11/00C02F1/52C01B33/20C01G11/02C01G21/21C02F101/20
CPCC01B33/20C01G11/02C01G21/21C01P2006/80C02F1/5236C02F11/00C02F2101/20C02F2101/203C02F2303/06
Inventor 徐斌张毅敏李佳彭福全孔明张孝飞朱月明
Owner NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA
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