Method for comprehensive treatment of acidic liquid obtained from waste hydrochloric acid and alkaline sludge

A comprehensive treatment, acid solution technology, applied in water/sludge/sewage treatment, metallurgical wastewater treatment, chemical instruments and methods, etc., can solve the problems of low lead and zinc content, transfer, high energy consumption, and achieve low treatment costs , Solve the problem of pollution control, good effect

Active Publication Date: 2019-02-19
江苏荣信环保科技有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can also be made into iron salt water purifier by chemical method, but it will cause the transfer of heavy metal lead and zinc pollution when used
Alkaline sludge is generally landfilled or smelted in a rotary kiln. Landfilling will pollute groundwater. Although heavy metals such as lead and zinc in sludge can be extracted through smelting in a rotary kiln, the sludge contains about 80% water. The content of lead and zinc is very low, the energy consumption is high, and the smelting will also produce waste gas containing heavy metals, which will pollute the environment
[0004] Someone has already proposed a patent application for "Comprehensive Treatment of Waste Hydrochloric Acid and Alkaline Sludge Produced in Steel Wire Rope Processing" on how to deal with the above waste hydrochloric acid and alkaline sludge. The patent application number is: 201510276802.X, passed Comprehensive treatment of waste hydrochloric acid and alkaline sludge to obtain acidic liquid containing iron, aluminum, zinc, lead, and calcium, or acidic liquid containing iron, aluminum, zinc, lead, and sodium, but there is no specific reference to waste hydrochloric acid Comprehensive treatment of acidic liquid obtained from alkaline sludge

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1. A method for comprehensively treating acidic liquid obtained from waste hydrochloric acid and alkaline sludge. The pH value in the acidic liquid is 0 to 1. The specific steps are as follows:

[0024] A. Filtrate the acidic liquid obtained from waste hydrochloric acid and alkaline sludge to remove a small amount of acid-insoluble impurities to obtain filtrate I and filter cake I, and filter cake I is lead slag;

[0025] B. Adjust the pH value of the filtrate I to 2-3, and then oxidize the filtrate I. When oxidizing the filtrate I, first use air to oxidize the filtrate I, and then add hydrogen peroxide to further oxidize, so that all the ferrous ions in the filtrate I are oxidized to trivalent Iron ions, and then adjust the pH value of the oxidized filtrate I to 3.5-4, so that the ferric iron is fully hydrolyzed to form iron hydroxide precipitation, and the filtrate II and filter cake II are obtained by filtration. iron deposits;

[0026] C, adjust the pH v...

Embodiment 2

[0031] Embodiment two, the present embodiment is that filter cake II, filter cake III, filter cake IV obtained in embodiment one are processed respectively, and its specific operation steps are as follows:

[0032] A. Treat filter cake II: filter cake II is mainly ferric hydroxide, add appropriate amount of sulfuric acid to filter cake II, filter to obtain filtrate VI and filter cake VI, filtrate VI is ferric sulfate solution or liquid polyferric sulfate, filter cake VI For lead slag.

[0033] B. Treat filter cake III: filter cake III is mainly aluminum hydroxide, add appropriate amount of sulfuric acid to filter cake III, filter to obtain filtrate VII and filter cake VII, filtrate VII is flocculant liquid aluminum sulfate, filter cake VII is lead slag .

[0034] C. Treat the filter cake IV: the filter cake IV is mainly zinc hydroxide, add an appropriate amount of sulfuric acid to the filter cake IV, and filter to obtain the filtrate VIII and filter cake VIII, the filtrate VI...

Embodiment 3

[0035] Embodiment three, this embodiment is to process the filter cake I, filter cake V, filter cake VI, filter cake VII and filter cake VIII obtained in the embodiment one and embodiment two, and its specific operation steps are as follows:

[0036] Filter cake I, filter cake V, filter cake VI, filter cake VII and filter cake VIII are mixed to obtain higher-grade lead slag raw materials that can be sold directly.

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PUM

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Abstract

The invention discloses a method for comprehensively treating acid liquid obtained from waste hydrochloric acid and alkaline sludge. The pH (potential of hydrogen) value of the acid liquid is 0-1, and liquid calcium chloride, sodium chloride filtrate, ferric sulfate liquor, liquid polymeric ferric sulfate, flocculant liquid aluminum sulfate, zinc sulfate liquor and lead skim filter cakes are obtained through acid liquid filtration and pH value adjustment. The method has the advantages that pollution problems of the waste hydrochloric acid containing iron, aluminum, lead and zinc and the alkaline sludge which are generated during processing of steel wire ropes are solved fundamentally, waste materials are recycled through treatment of the acid liquid, resources are utilized fully, pollution control problems are solved fundamentally, treatment cost is quite low, benefit is high and environment friendliness is achieved.

Description

technical field [0001] The invention relates to the field of comprehensive treatment of industrial waste acid, in particular to a method for comprehensive treatment of acidic liquid obtained from waste hydrochloric acid and alkaline sludge. Background technique [0002] The steel wire rope needs to be pickled with hydrochloric acid to remove the scale on the metal surface during the processing. As the concentration of iron in the pickling liquid hydrochloric acid gradually increases, and the acidity of hydrochloric acid decreases accordingly, it must be scrapped when the iron concentration reaches a certain value, so When waste hydrochloric acid is produced, about 0.032 tons of waste hydrochloric acid will be produced for every ton of steel wire rope produced, and the formed waste hydrochloric acid contains various impurities such as iron, aluminum, zinc, and lead, which will affect its direct utilization. In addition to pickling, phosphating, galvanizing, and lead bath heat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F103/16
Inventor 李绍国
Owner 江苏荣信环保科技有限公司
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