Method for preparing ammonium-free plating assistant agent by recycling and utilizing low-zinc-contained acid wastewater

A technology of acid wastewater and recycling, applied in chemical instruments and methods, metallurgical wastewater treatment, oxidized water/sewage treatment, etc., can solve zinc content loss, secondary pollution of secondary hazardous waste iron sludge, and difficulty in adjusting pH value Control and other issues to achieve the effect of high efficiency and selectivity, high selectivity, and simple process operation

Inactive Publication Date: 2018-06-22
CHANGZHOU WUJIN YOUBANG WATER PURIFICATION MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the regenerative iron removal technology is simple in principle and low in cost, it is difficult to control the pH value adjustment, which may lead to the loss of some zinc content, and the secondary hazardous waste iron sludge (Fe(OH) 3 Precipitation) There is a risk of secondary pollution, and at the same time, it increases the disposal cost of the enterprise

Method used

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  • Method for preparing ammonium-free plating assistant agent by recycling and utilizing low-zinc-contained acid wastewater
  • Method for preparing ammonium-free plating assistant agent by recycling and utilizing low-zinc-contained acid wastewater
  • Method for preparing ammonium-free plating assistant agent by recycling and utilizing low-zinc-contained acid wastewater

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Effect test

Embodiment 1

[0033] Such as figure 1 Shown a kind of resource recycling and utilization of low zinc-containing acidic wastewater to prepare the method for ammonium-free plating flux, comprising the following steps:

[0034] (1), concentrated, the low zinc-containing acidic wastewater described in Table 1 is pumped into the concentration equipment for pretreatment, stirred and evaporated and concentrated 10 times, to obtain high zinc-containing acidic wastewater;

[0035] (2), oxidize, add sodium chlorate in the highly zinc-containing acidic waste water after concentrated pretreatment in step (1), normal temperature stirring reaction 10min, a small amount of divalent iron in the waste water is all oxidized into ferric iron, chloric acid The mass ratio of sodium to high zinc-containing acidic wastewater is 0.75:100;

[0036] (3), extract and remove iron, add complexing extractant to the high zinc-containing acidic wastewater after oxidation in step (2) and carry out multistage continuous fo...

Embodiment 2

[0039] Such as figure 1 Shown a kind of resource recycling and utilization of low zinc-containing acidic wastewater to prepare the method for ammonium-free plating flux, comprising the following steps:

[0040] (1), concentrated, the low zinc-containing acidic wastewater described in Table 1 is pumped into the concentration equipment for pretreatment, stirred and evaporated and concentrated 10 times, to obtain high zinc-containing acidic wastewater;

[0041] (2), oxidize, add sodium chlorate in the highly zinc-containing acidic waste water after concentrated pretreatment in step (1), normal temperature stirring reaction 10min, a small amount of divalent iron in the waste water is all oxidized into ferric iron, chloric acid The mass ratio of sodium to high zinc-containing acidic wastewater is 0.75:100;

[0042] (3), extract and remove iron, add complexing extractant to the high zinc-containing acidic wastewater after oxidation in step (2) and carry out multistage continuous fo...

Embodiment 3

[0045] (1), concentration, the low zinc-containing acidic wastewater described in Table 1 is pumped into the concentration equipment for pretreatment, stirring and evaporating and concentrating 15 times, to obtain high zinc-containing acidic wastewater;

[0046] (2), oxidation, add sodium chlorate in the highly zinc-containing acidic waste water after concentrated pretreatment in step (1), normal temperature stirring reaction 15min, a small amount of divalent iron in the waste water is all oxidized into ferric iron, chloric acid The mass ratio of sodium to high zinc-containing acidic wastewater is 0.75:100;

[0047] (3), extract and remove iron, add complexing extractant to the high zinc-containing acidic wastewater after oxidation in step (2) and carry out multistage continuous forward extraction, the forward extraction volume ratio of complexing extractant and high zinc-containing acidic wastewater 5:1, stirred and reacted for 15 minutes, extracted the ferric iron into the o...

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Abstract

The invention discloses a method for preparing an ammonium-free plating assistant agent by recycling and utilizing low-zinc-contained acid wastewater. The method comprises the steps of concentration,oxidation, extraction for iron removal and extraction agent regeneration. The method has the beneficial effects that the removal rate of iron in the wastewater can reach 99.0-99.9% after the wastewater is treated, and the recycling rate of zinc can reach 96-98% or above; the treated and recycled ZnCl2 extraction raffinate can meet the plating assistant agent use standard requirements of hot galvanizing enterprises and be sold to hot galvanizing factories; iron-contained hydrochloric acid obtained after reverse extraction can be used for efficient preparation of iron-salt water purifying agentproducts; an extraction agent has high efficiency and high selectivity and can be regenerated and recycled after being subjected to reverse extraction treatment; technological operation is simple, safe, clean and environmentally friendly, no secondary hazardous waste is generated, no pollution or emission is generated, and treatment and recycled utilization of the low-zinc-contained acid wastewater are achieved thoroughly; and meanwhile the invention provides a novel plating assistant agent iron removal process technology and the preparation method for the ammonium-free plating assistant agent, and double benefits of economy and environmental protection are achieved.

Description

technical field [0001] The invention relates to the technical fields of hazardous waste disposal, resource regeneration and development of circular economy, in particular to a method for preparing ammonium-free plating flux by resource recovery and utilization of low-zinc-containing acidic wastewater. Background technique [0002] In recent years, with the rapid development of the hot-dip galvanizing industry, the application of zinc has caused a large amount of zinc-containing wastewater to be discharged, causing serious environmental pollution and waste of resources. Most of them participate in the food chain cycle and eventually accumulate in organisms, destroying the normal physiological metabolic activities of organisms and endangering human health. Therefore, the treatment of zinc-containing wastewater is a hot topic in environmental protection research. [0003] At present, the treatment of zinc-containing wastewater at home and abroad can be divided into chemical me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B19/30C22B19/20C23C2/06C23C2/02C02F9/00C02F103/16
CPCC02F1/048C02F1/26C02F1/722C02F1/727C02F1/76C02F9/00C02F2103/16C22B7/006C22B19/20C22B19/30C23C2/02C23C2/06Y02P10/20
Inventor 蒋银峰左选凤王桂玉
Owner CHANGZHOU WUJIN YOUBANG WATER PURIFICATION MATERIALS
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