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Rapid recycling method of zinc-containing pickling waste liquid

A technology for the recycling of pickling waste liquid, applied in the direction of zinc oxide/zinc hydroxide, etc., can solve the problems of environmental pollution of zinc-containing pickling waste liquid, and achieve the effects of low cost, uniform heating and high product quality.

Inactive Publication Date: 2021-03-30
桃江县德聚人和中小企业公共服务平台有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to its particularity, the iron and steel industry has never had a suitable solution to the extremely serious environmental pollution caused by zinc-containing pickling waste

Method used

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  • Rapid recycling method of zinc-containing pickling waste liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A rapid recycling method for zinc-containing pickling waste:

[0022] Zn 2+ The zinc-containing pickling waste liquid with a substance concentration ≥ 0.01mol / L is injected into the sedimentation tank through the delivery pipe, and the saturated ammonium bicarbonate solution is slowly injected until the pH of the system is 6.2 to 6.6, and the injection of the saturated ammonium bicarbonate solution is stopped. Settle at 35°C for 18 hours, absorb the supernatant, filter the sediment below, add the filter cake to the washing tank, wash with 10% sodium hydroxide solution, filter, wash the filter cake with water, and put it in an oven at 90°C Dry in medium for 15 hours to obtain the crude product of basic zinc carbonate; add the crude product of basic zinc carbonate to a ball mill tank, adopt a ball-to-material ratio of 10:1, anhydrous ethanol and polyethylene glycol 400 with a volume ratio of 10:1 as a composite dispersant , the weight of the composite dispersant is 12% o...

Embodiment 2

[0024] A rapid recycling method for zinc-containing pickling waste:

[0025] Zn 2+ The zinc-containing pickling waste liquid with a substance concentration ≥ 0.01mol / L is injected into the sedimentation tank through the delivery pipe, and the saturated ammonium bicarbonate solution is slowly injected until the pH of the system is 6.2 to 6.6, and the injection of the saturated ammonium bicarbonate solution is stopped. Settle at 30°C for 20 hours, absorb the supernatant, filter the sediment below, put the filter cake into the washing tank, wash with 10% sodium hydroxide solution, filter, wash the filter cake with water, and put it in an oven at 85°C Dry in medium for 15 hours to obtain the crude product of basic zinc carbonate; add the crude product of basic zinc carbonate to a ball mill tank, use anhydrous ethanol and polyethylene glycol 400 with a ball-to-material ratio of 12:1, and a volume ratio of 5:1 as a composite dispersant , the weight of the composite dispersant is 10...

Embodiment 3

[0027] A rapid recycling method for zinc-containing pickling waste:

[0028] Zn 2+ The zinc-containing pickling waste liquid with a substance concentration ≥ 0.01mol / L is injected into the sedimentation tank through the delivery pipe, and the saturated ammonium bicarbonate solution is slowly injected until the pH of the system is 6.2 to 6.6, and the injection of the saturated ammonium bicarbonate solution is stopped. Settle at 30°C for 15 hours, absorb the supernatant, filter the sediment below, add the filter cake to the washing tank, wash with 10% sodium hydroxide solution, filter, wash the filter cake with water, and put it in an oven at 80°C Dry in medium for 10 hours to obtain the crude product of basic zinc carbonate; add the crude product of basic zinc carbonate to a ball mill tank, use anhydrous ethanol and polyethylene glycol 400 with a ball-to-material ratio of 10:1, and a volume ratio of 5:1 as a composite dispersant , the weight of the composite dispersant is 10% ...

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Abstract

The invention relates to the technical field of pickling waste liquid treatment, in particular to a rapid recycling method of zinc-containing pickling waste liquid. The method comprises the followingsteps: injecting the zinc-containing pickling waste liquid into a sedimentation tank, slowly injecting a saturated ammonium bicarbonate solution until the pH value of the system is 6.2-6.6, standing and settling at 30-35 DEG C for 15-20 hours, filtering the lower precipitate, adding the filter cake into a washing tank, washing with a sodium hydroxide solution, and drying, and obtaining a basic zinc carbonate crude product; enabling the ball-milled basic zinc carbonate crude product to enter a suspension calcining device under the driving of hot air, performing primary suspension preheating to300-350 DEG C, performing secondary suspension heating to 550-600 DEG C, finally heating to 800-850 DEG C, performing suspension calcining, collecting zinc oxide obtained by suspension calcining through a cyclone collector, enabling separated hot air to enter a primary suspension process for recycling. High-purity zinc oxide is obtained by the method so that waste is turned into wealth; the methodis low in cost, high in efficiency, high in product quality and environmentally friendly, and a good technical scheme is provided for treating the zinc-containing pickling waste liquid in the iron and steel industry.

Description

technical field [0001] The invention relates to the technical field of pickling waste liquid treatment, in particular to a rapid recycling method for zinc-containing pickling waste liquid. Background technique [0002] Pickling waste liquid is waste liquid produced when sulfuric acid, nitric acid, hydrochloric acid, hydrofluoric acid and phosphoric acid are used for pickling treatment in order to remove metal surface oxides. In the steel industry, since pickling is an unavoidable step, a large amount of steel pickling waste is produced every day. [0003] The acid in the waste pickling liquid of steel mainly refers to hydrochloric acid, which contains high concentration of hydrochloric acid and ferrous ions, the pH of the waste pickling liquid is about 0.2-3.0, and the main component is Fe 2+ , containing a small amount of Fe 3+ and some other impurities, some also contain PO 4 3- , Zn 2+ , commonly known as "pickling solution". Therefore, if the waste liquid is discha...

Claims

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Application Information

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IPC IPC(8): C01G9/02
CPCC01G9/02C01P2006/80
Inventor 陈志高陈凯波
Owner 桃江县德聚人和中小企业公共服务平台有限公司
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