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Method for recycling stainless steel pickling wastewater

A technology for pickling wastewater and stainless steel, applied in chemical instruments and methods, metallurgical wastewater treatment, water/sewage treatment, etc., can solve the problems of difficult heavy metal sludge treatment, low utilization rate of valuable elements, and large sludge production , to achieve the effect of shortening the wastewater treatment process, reducing the amount of sludge produced, and reducing the rate of sludge production

Inactive Publication Date: 2018-12-04
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In view of the above-mentioned deficiencies in the prior art, the main purpose of the present invention is to overcome the problems of large amount of stainless steel pickling wastewater sludge, difficult to handle heavy metal sludge, and low utilization rate of valuable elements, and provide a resource for stainless steel pickling wastewater The comprehensive utilization method provides an effective way for the comprehensive utilization of stainless steel pickling wastewater

Method used

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  • Method for recycling stainless steel pickling wastewater
  • Method for recycling stainless steel pickling wastewater
  • Method for recycling stainless steel pickling wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Such as figure 1 Shown, a kind of stainless steel pickling waste water resource recovery method, described method comprises the following steps:

[0037] a. Take 500mL of acid wastewater with pH=1.2, first add CaO to adjust the pH to 4.0, the amount of CaO added is 3.6g, then add NaOH to adjust the pH to 9.0, the amount of NaOH added is 1.5g, and the mass ratio of CaO to NaOH is 2.4 , fully stirred and reacted in 1# neutralization tank for 1h;

[0038] b. After fully reacting, the liquid in the 1# neutralization tank is put into the 1# settling tank for sedimentation, the supernatant is put into the 2# neutralization tank, the solid phase sludge is filtered, and the filter residue is dried to obtain dry sludge 6.74 g, the filtrate returns to the 2# neutralization pool;

[0039] c. The dried filter residue is mixed evenly with anthracite, the amount of anthracite added is 9% of the filter residue, the briquette is placed in a graphite crucible, and roasted at 1200 ° C ...

Embodiment 2

[0044] Such as figure 1 Shown, a kind of stainless steel pickling waste water resource recovery method, described method comprises the following steps:

[0045] a. Take 500mL acid wastewater with pH=1.2, add Ca(OH) first 2 Adjust pH to 4.0, CaO addition is 5.4g, add NaOH to adjust pH to 9.0, NaOH addition is 1.5g, Ca(OH) 2 The mass ratio to NaOH is 3.6, fully stirred and reacted in 1# neutralization tank for 1h;

[0046]b. After fully reacting, the liquid in the 1# neutralization tank is put into the 1# settling tank for sedimentation, the supernatant is put into the 2# neutralization tank, the solid phase sludge is filtered, and the filter residue is dried to obtain dry sludge 6.84 g, the filtrate returns to the 2# neutralization pool;

[0047] c. The dried filter residue is mixed evenly with anthracite, the amount of anthracite added is 9% of the filter residue, the briquette is placed in a graphite crucible, and roasted at 1200 ° C for 2 hours;

[0048] d. After roastin...

Embodiment 3

[0055] Such as figure 1 Shown, a kind of stainless steel pickling waste water resource recovery method, described method comprises the following steps:

[0056] a. Take 500mL of acid wastewater with pH=1.2, first add CaO to adjust the pH to 4.0, the amount of CaO added is 3.6g, then add NaOH to adjust the pH to 12.0, the amount of NaOH added is 3.2g, and the mass ratio of CaO to NaOH is 1.13 , fully stirred and reacted in 1# neutralization tank for 1h;

[0057] b. After fully reacting, the liquid in the 1# neutralization tank is put into the 1# settling tank for sedimentation, the supernatant is put into the 2# neutralization tank, the solid phase sludge is filtered, and the filter residue is dried to obtain dry sludge 6.74 g, the filtrate returns to the 2# neutralization pool;

[0058] c. The dried filter residue is mixed evenly with anthracite, the amount of anthracite added is 12% of the filter residue, the briquetting is placed in a graphite crucible, and roasted at 1200...

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Abstract

The invention discloses a method for recycling stainless steel pickling wastewater. The method comprises the following steps: 1) adding a neutralizing agent A to the stainless steel pickling wastewater to adjust a pH value to 3.0-8.0, then adding a neutralizing agent B to adjust the pH value to 9.0-12.0, respectively precipitating Fe, Cr, Ni and F in the wastewater in the forms of Fe(OH)3, Cr(OH)3, Ni(OH)2 and CaF2, and performing solid-liquid separation to obtain a solid phase sludge and a liquid phase; 2) drying the solid phase sludge obtained in the step 1) and adding a reducing agent for carbothermal reduction, and roasting the material in reducing atmosphere at 1150 DEG C to 1300 DEG C to obtain a calcined product; 3) performing fragmentation on the calcined product obtained in step 2) and performing ore dressing separation to obtain iron-chromium-nickel alloy powder and fluorine-containing tailings, and realizing separation of metal elements and fluorine elements; 4) performing flotation on the fluorine-containing tailings obtained in the step 3) to obtain a fluorite concentrate; and 5) performing NO3<-> removal on the liquid phase obtained in the step 1), and adjusting the material to neutrality, discharging while reaching the standard. The method can effectively treat the stainless steel pickling wastewater, and the discharge does not pollute the environment.

Description

technical field [0001] The invention belongs to the technical field of wastewater reprocessing. Specifically, the invention relates to a method for resource utilization of stainless steel pickling wastewater, in particular to a method for resource utilization of iron, chromium and nickel in stainless steel pickling wastewater. Background technique [0002] Stainless steel is widely used because of its excellent corrosion resistance and good appearance. In the production process of stainless steel, it is inevitable to go through annealing, normalizing, quenching, welding and other processing processes, and black oxide scales often appear on the surface. Oxide scale not only affects the appearance of stainless steel, but also adversely affects the subsequent processing of the product, so it must be removed by surface treatment methods such as pickling and polishing before subsequent processing. [0003] In the pickling process of stainless steel, generally, the surface oxide ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F11/00C02F11/10C22B7/00C22B23/00C01F11/22C02F103/16
CPCC01F11/22C02F1/5236C02F1/66C02F11/00C02F11/10C02F2103/16C22B7/001C22B7/006C22B23/0461Y02P10/20
Inventor 郭强吴名涛李永利邵大伟齐涛
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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