Recycling method of pickling sludge

A technology of pickling sludge and washing with water, which is applied in chemical instruments and methods, iron compounds, inorganic chemistry, etc., can solve the problems of mild and weak magnetism, increase waste liquid, complex process, etc., and achieve low cost, easy operation, and high purity high effect

Inactive Publication Date: 2014-07-30
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method is complicated in technology, and acid leaching leads to an increase in waste liquid, and the amount of added iron source is ferrous sulfate of 10 to 20 times the weight of the heavy metal in the acid leaching mixed solution. Adding too much iron source will cause the main product in the product to be Ferric oxide, ferric oxide is extremely easy to oxidize into ferric oxide with slightly weak magnetic properties

Method used

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  • Recycling method of pickling sludge
  • Recycling method of pickling sludge
  • Recycling method of pickling sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The process and steps of this embodiment are as follows:

[0030] The main heavy metal content (wt%) in the pickling sludge is shown in the following table 1:

[0031] Table 1 Main heavy metal content in pickling sludge (wt%)

[0032] the element

Fe

Cu

Ni

Cr

Zn

mn

Mg

Cd

Pb

Ag

Ca

g / 100g dry sludge

40.32

2.00

0.52

0.62

0.42

0.43

1.4

UD

UD

UD

12.93

[0033] Dry the pickling sludge at 105°C for 12 hours, grind it, and pass it through a 100-mesh sieve;

[0034] Weigh 1g of pickling sludge and 1g of ferrous chloride and put it into a conical flask, add 20ml of distilled water to form a slurry;

[0035] Then add 0.05g polyethylene glycol, stir to make a raw material slurry, then add ammonia water to adjust the pH value of the slurry to 11, put it in an autoclave, and conduct a hydrothermal reaction at a temperature of 200°C, and the reaction time is 8h; the reaction...

Embodiment 2

[0042] The main heavy metal content (wt%) in the pickling sludge is shown in the following table 2:

[0043] Table 2 Main heavy metal content in pickling sludge (wt%)

[0044] the element

Fe

Cu

Ni

Cr

Zn

mn

Mg

Cd

Pb

Ag

Ca

g / 100g dry sludge

50.12

UD

0.14

0.58

0.18

0.12

1.6

UD

UD

UD

6.14

[0045] Dry the pickling sludge at 110°C for 10 hours, grind it, and pass it through a 200-mesh sieve;

[0046] Weigh 1g of pickling sludge and 2g of ferrous chloride into a conical flask, add 30ml of distilled water to form a slurry; then add 0.35g of polyethylene glycol, stir to make a raw material slurry, then add ammonia water to adjust the pH of the slurry to 7 Finally, place it in an autoclave, and carry out a hydrothermal reaction at a temperature of 300° C., and the reaction time is 4 hours;

[0047] After the reaction is completed, the kettle body is naturally cooled to room ...

Embodiment 3

[0049] The main heavy metal content (wt%) in the pickling sludge is shown in the following table 3:

[0050] Table 3 Main heavy metal content in pickling sludge (wt%)

[0051] the element

Fe

Cu

Ni

Cr

Zn

mn

Mg

Cd

Pb

Ag

Ca

g / 100g dry sludge

18.27

3.00

0.17

0.27

1.15

0.12

1.65

0.12

UD

UD

12.93

[0052] Dry the pickling sludge at 120°C for 6 hours, grind it, and pass it through a 300-mesh sieve;

[0053] Weigh 1g of pickling sludge and 5g of ferrous chloride into a conical flask, add 40ml of distilled water to form a slurry; then add 0.5g of polyethylene glycol, stir to make a raw material slurry, and then add ammonia water to adjust the pH value of the slurry to 13 , placed in an autoclave, and subjected to a hydrothermal reaction at a temperature of 100°C, the reaction time is 12h;

[0054] After the reaction is completed, the kettle body is naturally cooled to room t...

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Abstract

The invention discloses a recycling method of pickling sludge, and belongs to the solid waste material utilization technology of environmental engineering. According to the recycling method, a pickling sludge solid waste material is taken as raw material; an appropriate amount of an iron source is replenished; water is taken as a solvent; ammonium hydroxide is taken as a pH conditioning agent; a foaming agent is added; and a corresponding heavy metal hydroxide is obtained at a certain temperature under a certain pressure; the heavy metal hydroxide is taken as a precursor, and is delivered into a special physical and chemical environment which can not be realized at normal temperature under normal pressure, so that the precursor is dissolved completely, different growth units are formed, nucleation growth according to a certain combination manner is realized, stable ferrite with low leaching toxicity and high saturation magnetization degree is obtained via crystallization. The recycling method is suitable for environmental protection, and is capable of realizing recycling of pickling sludge resources, and increasing additional value of the pickling sludge resources. Particle size of the ferrite obtained via the recycling method ranges from 200 to 400nm; the ferrite is spherical particle particles, and possesses excellent crystal form and organic waste water adsorption capacity.

Description

technical field [0001] The invention belongs to the technical field of solid waste utilization in environmental engineering, in particular to a method for recycling pickling sludge. Background technique [0002] In the process of steel production and processing, in order to improve the corrosion resistance and surface quality of the product, it is necessary to clean the surface of the product with sulfuric acid, hydrofluoric acid and nitric acid, and the wastewater generated by cleaning contains a large amount of waste acid. Pickling waste liquid will be produced during the recovery of waste acid, which cannot be discharged directly, otherwise it will pollute the environment. For the treatment of pickling waste liquid, some iron and steel enterprises still use traditional treatment methods, that is, generally use lime, calcium carbide Slag or calcium hydroxide is used to neutralize it, and a large amount of sludge is produced at the same time, that is, pickling sludge. More...

Claims

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Application Information

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IPC IPC(8): C01G49/00
Inventor 孙秀云王连军杨洋褚禛方斌斌李健生沈锦优韩卫清刘晓东
Owner NANJING UNIV OF SCI & TECH
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