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Method for pickling waste sulfuric acid by comprehensive utilization of steel

A technology of iron and steel pickling waste and sulfuric acid, which is applied in the field of chemical resource recycling, can solve the problems of poor disposal effect, high treatment cost, complicated process, etc., and achieve the effect of improving utilization rate, no secondary pollution, and simple process

Inactive Publication Date: 2018-11-16
NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems of complex process, high treatment cost and poor disposal effect of the existing waste acid disposal method, the present invention provides a method for comprehensively utilizing waste sulfuric acid from iron and steel pickling, that is, adjusting the pH of waste acid with quicklime to obtain sulfuric acid while reducing acidity Calcium products, the waste acid with reduced acidity is adsorbed by cation exchange resin to extract the iron in the waste acid, and at the same time obtain relatively pure regenerated acid

Method used

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  • Method for pickling waste sulfuric acid by comprehensive utilization of steel
  • Method for pickling waste sulfuric acid by comprehensive utilization of steel

Examples

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Effect test

Embodiment 1

[0031] according to figure 1 Process flow chart:

[0032] (1) First, take 500mL of waste sulfuric acid, add 25.2g of quicklime, and stir for 5 minutes. At this time, the pH value is 1.32. Filter with suction to obtain the filter cake and yellow-brown filtrate. Rinse the filter cake with distilled water for 3 times, and dry it at 105°C. 2h, obtain calcium sulfate product, calcium sulfate content is 96.94%;

[0033] (2) Take 100mL of the yellow-brown filtrate in a 250mL beaker, put 30mL of cation exchange resin into it, and stir slowly at room temperature for 10min to obtain regenerated sulfuric acid, wherein the metal impurity content is 0.17%;

[0034] (3) Take out the resin saturated with adsorption, put it in a 250mL beaker, add 100mL of 10% hydrochloric acid solution, place it on a water bath constant temperature oscillator for desorption, shake at 25°C for 30min, and obtain the regenerated resin and desorption solution;

[0035] (4) Take the desorption solution and disti...

Embodiment 2

[0038] according to figure 1 Process flow chart:

[0039] (1) First, take 500mL of waste sulfuric acid, add 26.04g of quicklime, and stir for 7 minutes. At this time, the pH value is 1.57. Filter with suction to obtain the filter cake and yellow-brown filtrate. Rinse the filter cake with distilled water for 3 times, and dry it at 105°C. 3h, obtain calcium sulfate product, calcium sulfate content is 97.38%;

[0040] (2) Take 100mL of the yellow-brown filtrate in a 250mL beaker, put 28.57mL of cation exchange resin into it, and stir slowly at room temperature for 20min to obtain regenerated sulfuric acid, wherein the metal impurity content is 0.12%;

[0041] (3) Take out the adsorbed saturated resin, put it in a 250mL beaker, add 100mL of 10% hydrochloric acid solution, place it on a water bath constant temperature oscillator for desorption, shake at 25°C for 40min, and obtain the regenerated resin and desorption solution;

[0042] (4) Take the desorption solution and distill ...

Embodiment 3

[0044] according to figure 1 Process flow chart:

[0045] (1) First, take 500mL of waste sulfuric acid, add 26.46g of quicklime, and stir for 10 minutes. At this time, the pH value is 1.96. Filter cake and yellow-brown filtrate by suction filtration. Rinse the filter cake with distilled water for 3 times, and dry it at 105°C. 5h, obtain calcium sulfate product, calcium sulfate content is 97.38%;

[0046] (2) Take 100mL of the yellow-brown filtrate in a 250mL beaker, put 25mL of cation exchange resin into it, and stir slowly at room temperature for 20min to obtain regenerated sulfuric acid, wherein the metal impurity content is 0.08%;

[0047] (3) Take out the adsorbed saturated resin, put it in a 250mL beaker, add 100mL of 10% hydrochloric acid solution, place it on a water bath constant temperature oscillator for desorption, shake at 25°C for 40min, and obtain the regenerated resin and desorption solution;

[0048] (4) Take the desorption solution and distill and concentrate ...

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Abstract

The invention discloses a method for pickling waste sulfuric acid by comprehensive utilization of steel. The method comprises the following steps: 1) adding quicklime in steel pickling waste sulfuricacid, adjusting a pH value, stirring the material and performing pumping filtration to obtain a white filter cake and a yellow brown filtrate; b) using distilled water to flush the white filter cake,drying the white filter cake, and grinding the white filter cake to obtain a calcium sulfate product; c) flowing the yellow brown filtrate through a bed layer filled with cation exchange resin for absorption; d) using distilled water for flushing the absorbed and saturated cation exchange resin, adding hydrochloric acid, and performing constant-temperature concussion desorption; e) distilling desorption liquid, using regenerated hydrochloric acid in the step d); and f) heating and concentrating an iron chloride solution, and cooling crystal and filtering the crystal to obtain an iron chlorideproduct. The chemical deposition and an ion exchange method are combined for usage, acidity of waste acid is reduced, concentration of iron ions in the waste acid can be simultaneously increased, which is more suitable for an ion exchange technology, the technology is simple, no secondary pollution is generated, the utilization rate of steel pickling waste sulfuric acid is greatly increased, and the recycling of chemical resources is realized.

Description

technical field [0001] The invention belongs to the field of chemical resource recycling, and in particular relates to a method for comprehensively utilizing waste sulfuric acid from iron and steel pickling. Background technique [0002] Acid is an important inorganic chemical product, which can be used in industrial production as cleaning agent, raw material and catalyst. The industry consumes a large amount of acid every year. When the impurities in the acid reach a certain concentration, it cannot be used in production and becomes waste acid. According to the "National Hazardous Waste List", the waste acid produced in the production, sale and use of refined petroleum products, basic chemical manufacturing, steel rolling processing, metal surface treatment and heat treatment processing, electronic component manufacturing and other non-specific industries. Acid slag and acid sludge are hazardous wastes and must be handled by qualified hazardous waste disposal units. [00...

Claims

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Application Information

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IPC IPC(8): C23G1/36C23G1/08C01F11/46C01G49/10
CPCC01F11/46C01G49/10C01P2002/72C01P2006/80C23G1/081C23G1/36
Inventor 张后虎孙聪聪赵泽华焦少俊叶飞许元顺王俊杰
Owner NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA
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