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Steel wire rope picking waste acid and high zinc and lead-containing sludge co-disposal system and process

A steel wire rope acid and sludge technology is applied in the co-processing system and process field of steel wire rope pickling waste acid and sludge containing high zinc and lead. The process is simple, the effect of preventing environmental pollution and reducing environmental pollution

Active Publication Date: 2016-12-07
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

This method produces a large amount of zinc and lead-containing precipitates, which are hazardous wastes that need to be further disposed of at high cost
The second method includes roasting method, distillation crystallization method, replacement method, etc. Its purpose is to recover hydrochloric acid and iron elements in waste acid, but it cannot be used in actual operation due to the disadvantages of high operating costs, poor product quality, and high energy consumption. middle
The application does not consider the removal of zinc, but the zinc content in the waste acid and sludge produced by steel wire rope enterprises is extremely high (>40000mg / L), and the zinc needs to be removed before the discharge can meet the standard. At the same time, sulfide precipitation is not considered. The processing of the product requires further processing to realize resource utilization
In addition, the application added alkali solution when preparing the flocculant, and the quality of the final flocculant was relatively poor, which needs to be further improved

Method used

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  • Steel wire rope picking waste acid and high zinc and lead-containing sludge co-disposal system and process
  • Steel wire rope picking waste acid and high zinc and lead-containing sludge co-disposal system and process
  • Steel wire rope picking waste acid and high zinc and lead-containing sludge co-disposal system and process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] refer to figure 1 , figure 2 , add the sludge (moisture content 30%-75%) of the steel wire rope factory sludge into the mud acid stirring and dissolving device 1 after the plate and frame pressure filtration, and the dosage is: add to the mud acid stirring and dissolving device 1 1 / 3 of the volume, then add waste acid solution (H + The concentration is 13%, the lead content is 720mg / L, the zinc content is 4000mg / L), and the dosage is V (waste acid): V (sludge) = 3:1, that is, the volume is 9 cubic meters. After stirring for 2 hours and standing still for 3 hours, the supernatant was pumped into the lead and zinc removal device 2 using an acid-resistant lift pump. After testing, the lead content of the acid solution after dissolving the mud is 799mg / L, and the zinc content is 6940mg / L. Add 230kg of sodium sulfide solid to the lead and zinc removal device 2, stir and react for 30min, and pass the resulting lead and zinc precipitation mixture into the The lead-zinc pre...

Embodiment 2

[0059] refer to figure 1 , figure 2 1. Add the sludge (moisture content 40%-75%) of the steel wire rope factory sludge into the mud acid stirring and dissolving device 1 after the plate and frame pressure filtration, and the dosage is: add to the mud acid stirring and dissolving device 1 1 / 2 volume, then add waste acid solution (H + The concentration is 10%, the lead content is 4500mg / L, the zinc content is 5100mg / L), the dosage is V (waste acid): V (sludge) = 8: 1, that is, the volume is 24 cubic meters. After stirring and reacting for 4 hours and standing still for 5 hours, the supernatant was pumped into the lead and zinc removal device 2 using an acid-resistant lift pump. After testing, the lead content of the acid solution after dissolving the mud is 6500mg / L, and the zinc content is 7000mg / L. Add 1101kg of potassium sulfide solids to the lead-zinc removal device 2, stir and react for 60min, and pass the resulting lead-zinc precipitation mixture into the The lead-zinc...

Embodiment 3

[0066] refer to figure 1 , figure 2 1. Add the sludge (moisture content 40%-75%) of the steel wire rope factory sludge into the mud acid stirring and dissolving device 1 after the plate and frame pressure filtration, and the dosage is: add to the mud acid stirring and dissolving device 1 1 / 5 of the volume, then add waste acid solution (H + The concentration is 12%, the lead content is 3000mg / L, the zinc content is 4200mg / L), and the dosage is V (waste acid): V (sludge) = 10:1, that is, the volume is 30 cubic meters. After stirring and reacting for 1 hour and standing for 1 hour, the supernatant was pumped into the lead and zinc removal device 2 using an acid-resistant lift pump. Detect that the lead content of the acid solution after dissolving the mud is 5300mg / L, and the zinc content is 5600mg / L. Add 483.5kg of calcium sulfide solids to the lead-zinc removal device 2, stir and react for 30min, and pass the resulting lead-zinc precipitation mixture into the lead The zinc ...

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Abstract

The invention discloses a steel wire rope picking waste acid and high zinc and lead-containing sludge co-disposal system and process and belongs to the technical fields of environmental protection and wastewater treatment. The steel wire rope picking waste acid and high zinc and lead-containing sludge co-disposal system disclosed by the invention comprises a mud acid stirring and dissolving device, a lead and zinc removal device, a flocculating agent preparation device, a hydrogen sulfide absorption device and a lead and zinc precipitation separation device, wherein the mud acid stirring and dissolving device is connected with the lead and zinc removal device through a pipeline; and the lead and zinc removal device is connected with the flocculating agent preparation device, the hydrogen sulfide absorption device and the lead and zinc precipitation separation device through pipelines. The steel wire rope picking waste acid and high zinc and lead-containing sludge co-disposal process disclosed by the invention comprises the following steps: stirring and dissolving mud acids, removing lead and zinc, preparing polyferric flocculants, purifying hydrogen sulfide tail gas and performing lead and zinc precipitation separation. According to the invention, steel wire rope picking waste acid and high zinc and lead-containing sludge co-disposal can be realized, the elements such as zinc and lead can be effectively removed, and industrial products with high additive values are prepared.

Description

technical field [0001] The invention belongs to the field of resource utilization of solid hazardous waste in environmental protection and the field of waste water treatment. Specifically, it relates to a co-disposal system and process of steel wire rope pickling waste acid and sludge containing high zinc and lead. The waste acid produced in the process and the high-zinc and lead sludge produced in the production process are used as raw materials to prepare industrial products with added value. Resource co-disposal process. Background technique [0002] The steel wire rope is a structure made of at least two layers of steel wire or multiple strands twisted helically around a center or a rope core. The iron oxide layer formed on the surface during the production process needs to be removed by pickling. At present, domestic steel wire rope enterprises mainly pickle with hydrochloric acid. When the concentration of hydrochloric acid drops below 10%, the pickling effect drops si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F11/00C02F1/52C07C51/41C07C53/10C01G21/21C02F103/16
CPCC01G21/21C02F1/5236C02F9/00C02F11/00C07C51/412C02F2103/16C02F2101/20C02F1/72C02F1/52C02F2303/06C07C53/10Y02P10/20
Inventor 张毅敏徐斌彭福全孔明李国瑞
Owner NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA
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