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Method for harmlessly treating high-zinc and high-lead sludge

A harmless treatment of sludge, applied in the harmless treatment of lead sludge, high zinc field, can solve the problems of water and soil heavy metal pollution, achieve good environmental and social benefits, reduce production costs, prices cheap effect

Active Publication Date: 2016-06-08
NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Aiming at the problem that a large amount of existing heavy metal wire rope sludge containing lead and zinc cannot be effectively treated, long-term stacking will cause heavy metal pollution to water bodies and soil, and there is no corresponding technical method to solve this problem, the present invention provides a high-zinc-containing , The method of harmless treatment of lead sludge

Method used

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  • Method for harmlessly treating high-zinc and high-lead sludge
  • Method for harmlessly treating high-zinc and high-lead sludge
  • Method for harmlessly treating high-zinc and high-lead sludge

Examples

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Effect test

Embodiment 1

[0047] combine figure 1 , a method for harmless treatment of sludge containing high zinc and lead, the steps of which are:

[0048] A. Using steel wire rope factory pickling sludge with a lead content of 0.4-2% and a zinc content of 3-15% as raw material, dry the steel wire rope sludge containing high zinc and lead to constant weight; drying of steel wire rope sludge The temperature is 100-105°C, which does not change the material composition of the sludge.

[0049] The raw material used in the present invention is steel wire rope pickling sludge that cannot be effectively treated for a long time and is harmful to the environment, which belongs to hazardous solid waste. The mud output is large and stable, the price is low and needs to be disposed of urgently, there is no shortage of raw materials, the production cost is reduced, and good environmental and social benefits are obtained.

[0050] The composition of the raw materials required by the present invention is relative...

Embodiment 2

[0063] This embodiment is the same as embodiment 1, wherein, in step A, use the steel wire rope factory pickling sludge with a lead content of 0.4% and a zinc content of 3% as raw material, and dry the steel wire rope sludge containing high zinc and lead until constant Heavy; the drying temperature of the wire rope sludge is 100°C, which does not change the composition of the sludge;

[0064] In step C, the crushed wire rope sludge is added to 160g / L NaOH solution for reaction, and the dosage ratio is that 1 ton of dry sludge needs 5 cubic meters of strong alkali solution; Stirring at low speed, the reaction time is 60min, under the optimal reaction temperature, fully react to achieve the best extraction efficiency;

[0065] In step D, filter, rinse with water, and rinse 3 times;

[0066] In step E, add the sulfide separating agent reaction in the filtered gained zinc, lead complex filtrate; 2 S reagent was used as a separating agent, adding Na 2The S separating agent is 4 ...

Embodiment 3

[0071] This embodiment is the same as embodiment 1, wherein, in step A, the steel wire rope factory pickling sludge with a lead content of 2% and a zinc content of 15% is used as raw material, and the steel wire rope sludge containing high zinc and lead is dried to constant temperature. Heavy; the drying temperature of the wire rope sludge is 105°C, which does not change the composition of the sludge;

[0072] In step C, the crushed wire rope sludge is added to 240g / L NaOH solution for reaction, and the dosage ratio is 20 cubic meters of strong alkali solution for 1 ton of dry sludge; the reaction temperature is 70°C, and the reaction temperature is 600 rpm Stirring at low speed, the reaction time is 80min, under the optimum reaction temperature, fully react to achieve the best extraction efficiency;

[0073] In step D, filter, dehydrate and filter by plate and frame filter press, rinse the filter residue with water, and rinse 5 times;

[0074] In step E, add the sulfide sepa...

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Abstract

The invention discloses a method for harmlessly treating high-zinc and high-lead sludge, and belongs to the field of solid waste treatment in environmental protection. The method includes steps of A, drying the high-zinc and high-lead sludge from steel wire ropes until the weight of the high-zinc and high-lead sludge is constant; B, smashing the dried sludge from the steel wire ropes; C; enabling the smashed sludge from the steel wire ropes to react in 160-240 g / L NaOH solution; D, filtering the NaOH solution to obtain filter residues and filter liquid, washing filter residues by the aid of water and treating the washed filter residues in a centralized manner for filling or brick making; E, adding sulfide separating agents into the filter liquid with zinc-containing and lead-containing complexes and enabling the filter liquid and the sulfide separating agents to react to one another to obtain products; F, centrifugally filtering the products, drying the products to obtain lead residues with the lead contents higher than 70% and selling the lead residues; G, directly electrolyzing the remaining zinc-containing filter liquid and acquiring first-grade metal zinc powder with the zinc content higher than 97% on cathodes. 5-20 square liters of strong-alkali solution are required by each ton of the dried sludge. The method has the advantages that lead and zinc which are heavy metals in the acid pickling sludge from the steel wire ropes can be effectively extracted by the aid of the method, accordingly, hazards can be reduced, and waste can be reused.

Description

technical field [0001] The invention relates to the field of recycling solid hazardous waste in environmental protection, in particular to a method for harmless treatment of sludge containing high zinc and lead. Background technique [0002] With the acceleration of the urbanization process, the sludge production has also increased accordingly, which has caused a huge burden on our environment. Due to the different components of various sludges, the degree of harm caused is also different. Among them, the sludge produced by industrial wastewater is particularly serious, because the wastewater produced by some industries such as electroplating industry and iron and steel industry contains toxic and harmful heavy metals. After treatment, the wastewater can be discharged up to the standard. The problem is that more than half of the heavy metals in the sewage treatment process will be transferred to the sludge. The heavy metals in the sludge seriously hinder the resource utiliza...

Claims

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Application Information

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IPC IPC(8): C02F11/00C25C5/02C22B7/00C22B13/00
CPCC02F11/00C22B7/006C22B13/045C25C5/02Y02P10/20
Inventor 张毅敏孔明彭福全黄长春赵玉坤巫丹
Owner NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA
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