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Treatment method of zinc-containing and iron-containing waste acid

A processing method and technology for iron powder, applied in the field of processing zinc-containing iron-containing waste acid, can solve the problems of difficulty in recycling, low recovery rate of zinc and iron, etc.

Active Publication Date: 2014-01-29
3R ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Since iron hydroxide precipitation and zinc hydroxide precipitation are difficult to recycle, the recovery rate of zinc and iron is low during the treatment of spent acid containing zinc and iron

Method used

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  • Treatment method of zinc-containing and iron-containing waste acid
  • Treatment method of zinc-containing and iron-containing waste acid
  • Treatment method of zinc-containing and iron-containing waste acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] Add 1kg of iron powder to 50kg of zinc-containing iron-containing waste acid and let it stand for 36 hours to obtain a reducing solution. The mass percentage of zinc ions in the reducing solution is 1.65%, the mass percentage of ferrous ions is 8.13%, and the mass percentage of hydrochloric acid is 0.55%.

[0072] The reducing liquid is subjected to pressure filtration treatment, and the first filtrate is collected.

[0073] Put the first filtrate into the evaporator, slowly add 7.5kg 98% concentrated sulfuric acid under stirring conditions, and obtain a mixed solution after stirring evenly.

[0074] The evaporator was evacuated, the circulating cooling water was turned on, the temperature of the evaporator was raised to 90°C, and the vacuum evaporation was concentrated for 1 hour to obtain a concentrated solution. The mass ratio of concentrated liquid to mixed liquid is 70:100. The concentrated liquid is centrifuged and filtered, and the solid obtained is a mixture of ferro...

Embodiment 2

[0076] Add 2.5 kg of iron powder to 50 kg of zinc-containing and iron-containing waste acid, and let it stand for 24 hours to obtain a reducing solution. Table 3 shows the mass percentages of zinc ions, ferrous ions, and hydrochloric acid in the untreated zinc-containing iron-containing waste acid and the reducing solution.

[0077] table 3

[0078]

[0079] The reducing liquid is subjected to pressure filtration treatment, and the first filtrate is collected. Add the first filtrate to the evaporator, slowly add 15kg of 65% concentrated sulfuric acid under stirring conditions, and obtain a mixed solution after stirring evenly.

[0080] Apply a vacuum to maintain the pressure of the evaporator at -0.095MPa, turn on the circulating cooling water, raise the temperature of the evaporator to 95°C, and concentrate by vacuum evaporation for 1.5 hours to obtain a concentrated solution. The mass ratio of concentrated liquid to mixed liquid is 64:100. Centrifugal filtration of the concentra...

Embodiment 3

[0084] Add 2.5 kg of zinc powder to 50 kg of zinc-containing iron-containing waste acid, and let it stand for 12 hours to obtain a reducing solution. The reducing liquid is subjected to pressure filtration treatment, and the first filtrate is collected. Put the first filtrate into the evaporator, slowly add 7.5kg 98% concentrated sulfuric acid under stirring conditions, and obtain a mixed solution after stirring evenly.

[0085] Apply a vacuum to maintain the pressure of the evaporator at -0.095MPa, turn on the circulating cooling water, raise the evaporator to 100°C, and concentrate by vacuum evaporation for 1.5 hours to obtain a concentrated solution. The mass ratio of concentrated liquid to mixed liquid is 64:100. The concentrated solution is spray-dried to obtain a mixture of ferrous sulfate monohydrate and zinc sulfate monohydrate, wherein the mass percentage of ferrous ions is 23.5% and the mass percentage of zinc ions is 7.05%.

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Abstract

The invention relates to a treatment method of a zinc-containing and iron-containing waste acid. The method comprises the following steps: adding a reducing agent to the zinc-containing and iron-containing waste acid, and fully reacting to obtain a reducing liquid; filtering the reducing liquid to collect a first filtrate; adding concentrated sulfuric acid into the first filtrate, and uniformly stirring to obtain a mixed liquid; evaporating and concentrating the mixed liquid at 90-110 DEG C to obtain a concentrated liquid; filtering the concentrated liquid at 70-100 DEG C to obtain a mixture with solids of FeSO4.H2O and ZnSO4.H2O. A certain amount of zinc-containing and iron-containing waste acid and concentrated sulfuric acid is added into the filtered second filtrate for a concentration and crystallization process in the next cycle. According to the treatment method of the zinc-containing and iron-containing waste acid, heavy metal ions are replaced to single substances, and after solid impurities in the reducing liquid are filtered to remove, the concentrated sulfuric acid is added. The mixture is evaporated, concentrated and filtered to obtain the crystal mixture with solids of FeSO4.H2O and ZnSO4.H2O. The crystal mixture can be used as a mineral additive for feed. According to the treatment method of the zinc-containing and iron-containing waste acid, the recovery rates of zinc and iron are higher, and the product has broad market prospect.

Description

Technical field [0001] The invention relates to the treatment field of industrial wastewater, in particular to a treatment method of zinc- and iron-containing waste acid. Background technique [0002] Iron is an important component that constitutes hemoglobin, myoglobin, cytochromes and a variety of oxidases. It acts as a carrier of oxygen to ensure the transport of oxygen in body tissues and participate in complex redox processes in the body. Iron deficiency or poor utilization of iron in animals will lead to disturbances in the transportation and storage of oxygen, the transportation of carbon dioxide to carbon, and redox, affecting the growth and development of animals and even causing various diseases such as anemia. [0003] Zinc is a component of many metal acids and hormones, and more than 80 enzyme activities are known to be related to zinc. Zinc participates in protein, carbohydrate and lipid metabolism through enzymes and hormones, participates in the synthesis of deoxyr...

Claims

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Application Information

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IPC IPC(8): C02F9/10C01G49/14C01G9/06
Inventor 丁德才肖晋宜王权永樊文星杨柳荫龙国兵
Owner 3R ENVIRONMENTAL TECH CO LTD
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