Rapid recovery treatment method of common carbon steel hydrochloric acid pickling waste liquid

A pickling waste liquid recovery treatment technology, applied in metallurgical wastewater treatment, precipitation treatment, water/sewage treatment, etc., can solve the problems of secondary pollution, low concentration of recovered hydrochloric acid, high recovery cost, etc., to reduce treatment costs, solid The effect of high purity and high added value

Inactive Publication Date: 2020-03-24
郑州市拓邦环保科技有限责任公司
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0014] According to the above deficiencies in the prior art, the present invention provides a method for quickly recovering iron and acid in ordinary carbon steel pickling waste liquid with organic acid as an additive, which effectively solves the high recovery cost existing in the existing hydrochloric acid waste liquid treatment technology , Recovery of low concentration of hydrochloric acid, easy to produce secondary pollution and other problems, with high environmental benefits and economic benefits

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  • Rapid recovery treatment method of common carbon steel hydrochloric acid pickling waste liquid
  • Rapid recovery treatment method of common carbon steel hydrochloric acid pickling waste liquid

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Effect test

Embodiment 1

[0033] A kind of rapid recovery processing method of ordinary carbon steel hydrochloric acid pickling waste liquid, it is characterized in that: comprise the following steps:

[0034] 1) Add 500mL of pickling waste liquid containing 40g / L of ferrous iron and 150g / L of hydrochloric acid into a beaker, and place it in a constant temperature magnetic stirrer;

[0035] 2) Add 36 g of solid succinic acid to the pickling waste liquid in step 1), set the temperature at 30° C., and stir the pickling waste liquid added with succinic acid at a constant temperature; the stirring reaction time is 10 minutes to obtain ferrous succinate white precipitate mixture;

[0036] 3) adopting vacuum type circulating water pump to carry out solid-liquid separation to the ferrous succinate white precipitation mixture that step 2) obtains, obtain ferrous succinate precipitate and hydrochloric acid solution respectively;

[0037] 4) The hydrochloric acid solution obtained in step 3) is 226g / L after tes...

Embodiment 2

[0039] Embodiment 2: a kind of rapid recovery processing method of ordinary carbon steel hydrochloric acid pickling waste liquor, comprises the following steps:

[0040] 1) Add 500mL of pickling waste liquid containing 76g / L of ferrous iron and 121g / L of hydrochloric acid into a beaker, and place it in a constant temperature magnetic stirrer;

[0041] 2) Add 85.5 g of solid oxalic acid dihydrate to the waste pickling liquid in step 1), set the temperature at 40° C., and stir the waste pickling liquid with oxalic acid dihydrate at a constant temperature; the stirring reaction time is 30 minutes to obtain oxalic acid Ferrous yellow precipitate mixture;

[0042] 3) Carry out solid-liquid separation to the mixture of the ferrous oxalate yellow precipitate that step 2) obtains, obtain ferrous oxalate yellow precipitate and hydrochloric acid solution respectively;

[0043] 4) The hydrochloric acid solution obtained in step 3) is 226g / L after testing the concentration of free acid i...

Embodiment 3

[0046] A kind of rapid recovery treatment method of common carbon steel hydrochloric acid pickling waste liquor, comprises the following steps:

[0047] 1) Add 500 mL of pickling waste liquid containing 30 g / L of ferrous iron and 180 g / L of hydrochloric acid into a beaker, and place it in a constant temperature magnetic stirrer;

[0048] 2) Add 22 g of dihydrate oxalic acid liquid to the pickling waste liquid in step 1), set the temperature at 50° C., and stir the pickling waste liquid added with dihydrate oxalic acid at a constant temperature; the stirring reaction time is 60 minutes to obtain oxalic acid Iron yellow precipitation mixture;

[0049] 3) Carry out solid-liquid separation to the mixture of the ferrous oxalate yellow precipitate that step 2) obtains, obtain ferrous oxalate yellow precipitate and hydrochloric acid solution respectively;

[0050] 4) The hydrochloric acid solution obtained in step 3) is 226g / L after testing the concentration of free acid in the filtra...

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Abstract

The invention relates to a quick recovery treatment method of common carbon steel hydrochloric acid pickling waste liquid, and the method comprises the following steps: 1) adding a certain proportionof organic acid additive into pickling waste liquid containing a large amount of ferrous ions, and sufficiently stirring at constant temperature to obtain a solid-liquid mixture; 2) carrying out solid-liquid separation on the solid-liquid mixture by adopting a vacuum circulating water pump to obtain a metal organic acid precipitate of iron and other trace metal elements and a hydrochloric acid solution; 3) directly adding the hydrochloric acid solution into a common carbon steel washing section for cyclic utilization; and 4) performing high-temperature calcination and drying on the obtained metal organic acid salt in a muffle furnace to obtain the metal oxide. The method effectively solves the problems of high recovery cost, low concentration of recovered hydrochloric acid, easy generationof secondary pollution and the like in the existing hydrochloric acid waste liquid treatment technology, realizes hydrochloric acid regeneration cycle and metal oxide added high value, and has high environmental protection benefit and economic benefit.

Description

technical field [0001] The invention relates to the field of treatment of ordinary carbon steel hydrochloric acid pickling waste liquid, in particular to a rapid recovery and treatment method of hydrochloric acid pickling waste liquid. Background technique [0002] Iron and steel enterprises often use sulfuric acid or hydrochloric acid as pickling solution to remove oxide scale and other impurities on the surface of steel. Sulfuric acid mainly relies on acid liquid to go deep into the inner layer and continuously generate hydrogen to impact and peel off the iron scale to complete the pickling process, so it is easy to cause matrix iron. Phenomena such as pitting corrosion and hydrogen embrittlement cause greater loss of iron. Hydrochloric acid dissolves and reacts from the outside to the inside, but reacts slowly with the substrate; under the same conditions, the pickling speed of hydrochloric acid is higher than that of sulfuric acid; the production cost of sulfuric acid pic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/20C02F103/16
CPCC02F1/00C02F1/52C02F2001/007C02F2101/20C02F2101/203C02F2101/206C02F2103/16
Inventor 张景涛乔惠彩张海滨
Owner 郑州市拓邦环保科技有限责任公司
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