Stainless steel pickling sludge treatment method

A technology of pickling sludge and treatment method, which is applied in chemical instruments and methods, wet separation, photographic technology, etc., can solve the problems of large amount of stainless steel pickling sludge and high disposal costs, and achieve economic and social benefits. The effect of benign development, mature technology and simple process principle

Inactive Publication Date: 2020-08-21
SICHUAN JUNHE ENVIRONMENTAL PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the pickling process, metal oxides are dissolved in acid to form heavy metal sulfates. In order to meet the wastewater discharge standards, enterprises use limestone and lime to remove acid and settle heavy metals. After the treatment, the stainless steel pickling sludge produced is relatively large and contains a lot of heavy metals. It needs to be managed as industrial hazardous waste, and the disposal cost is high

Method used

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  • Stainless steel pickling sludge treatment method
  • Stainless steel pickling sludge treatment method

Examples

Experimental program
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Effect test

Embodiment 1

[0049] The present embodiment is taken from a stainless steel factory pickling sludge, analyzes the existing form of its heavy metal elements, and obtains the heavy metal element existing form table such as Table 1

[0050] Table 1 Existing forms of heavy metal elements in pickling sludge

[0051] form of existence iron chromium nickel copper cobalt molybdenum vanadium manganese titanium Hydroxide state Fe(OH) 3

Cr(OH) 3

Ni(OH) 2

Cu(OH) 2

Co(OH) 2

/ / Mn(OH) 2

/ Water-soluble ionic state FeO(OH) nH 2 o

[Cr(H 2 O) 6 ] 3+

/ / / / / / / alloy state alloy iron Alloy chrome Alloy Nickel Alloy copper Alloy cobalt Alloy molybdenum Alloy vanadium Alloy Manganese Alloy titanium

[0052] It can be seen from the above table that heavy metals in pickling sludge exist in three forms: water-soluble ionic state, aqueous hydroxide state and alloy state. Selective leac...

Embodiment 2

[0079] The stainless steel pickling sludge processing method of the present embodiment comprises the steps:

[0080] S1 crushing: drying, dehydrating and crushing the acid-washed sludge to below 80 mesh as a sample for later use;

[0081] Specifically: Take 10Kg of pickling sludge from the Southwest Stainless Steel Plant, dry and pulverize it to below -80 mesh (<0.178mm), mix it evenly and use it as a sample for later use;

[0082] S2 ammonia immersion: put the sample obtained in step S1 into the ammonia immersion tank and add ammonia water for immersion, and obtain ammonia leaching residue and ammonia leaching solution after solid-liquid separation:

[0083] Specifically: take 5Kg of the sample obtained in step S1 and put it into an ammonia immersion tank, then add 5L of ammonia water with a mass percentage concentration of 20%, soak for one day at room temperature, and separate the solid and liquid the next day to obtain 5.8Kg of ammonia leaching residue and ammonia leaching...

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Abstract

The invention discloses a stainless steel pickling sludge treatment method. The method comprises the following steps of S1, crushing; S2, ammonia leaching: S3, extraction and reextraction; S4, electrodeposition; S5, ammonia stilling; S6, strong magnetic separation; and S7, supergravity separation. According to the method, ammonia water is used for selectively leaching chromium, copper, zinc, nickel and cobalt, ammonia leaching residues are subjected to strong magnetic separation for magnetic iron residues, supergravity separation is used for selecting alloy-state heavy metal, heavy metal resources are completely recycled step by step, the process principle is simple, the technology is mature, and the method can be suitable for pickling sludge treatment of stainless steel enterprises.

Description

technical field [0001] The invention relates to the field of industrial waste residue and sludge treatment in iron and steel and metallurgical industries, in particular to a stainless steel pickling sludge treatment method. Background technique [0002] Generally, stainless steel thin plate products are used for decoration and living utensils. During the processing of the plate, some fine stainless steel oxide metal powder and uneven spots are attached to the surface of the plate, which need to be removed by grinding, pickling and polishing, thus forming stainless steel pickling sludge. . During the pickling process, metal oxides are dissolved in acid to form heavy metal sulfates. In order to meet the wastewater discharge standards, enterprises use limestone and lime to remove acid and settle heavy metals. After the treatment, the stainless steel pickling sludge produced is relatively large and contains a lot of heavy metals. It needs to be managed as industrial hazardous w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C25C1/08C25C1/10C25C1/12C25C1/16B03B7/00
CPCB03B7/00C22B7/006C22B7/008C22B7/04C25C1/08C25C1/10C25C1/12C25C1/16Y02P10/20
Inventor 王攀杨贤有罗启贵邓俊罗培强宋忠仪杨波黄敏
Owner SICHUAN JUNHE ENVIRONMENTAL PROTECTION
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