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Method for treating stainless steel pickling wastewater and synchronously synthesizing secondary iron minerals

A technology for pickling wastewater and stainless steel, which is applied in the field of sewage treatment, can solve the problems of large amount of neutralizing sediment and large demand for neutralizing agents, and can reduce the amount of alkali, reduce the neutralization sediment, and facilitate extraction and reuse. Effect

Pending Publication Date: 2021-06-18
NANJING AGRICULTURAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Aiming at the problems existing in the prior art in the process of stainless steel pickling wastewater treatment, such as large demand for neutralizing agents and large amount of neutralization sediment, the present invention provides an environmentally friendly, economical and effective stainless steel pickling wastewater treatment and synchronous synthesis secondary Method for pig iron minerals with resource recovery efficiency

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  • Method for treating stainless steel pickling wastewater and synchronously synthesizing secondary iron minerals
  • Method for treating stainless steel pickling wastewater and synchronously synthesizing secondary iron minerals
  • Method for treating stainless steel pickling wastewater and synchronously synthesizing secondary iron minerals

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Embodiment 1

[0048] A method for treating stainless steel pickling wastewater and synchronously synthesizing secondary iron minerals, the process is as follows figure 1 As shown, the method includes the following steps:

[0049] (1) Take 83mL of stainless steel pickling wastewater with a pH of 0.04, add tap water to make up to 250mL, that is, dilute 3 times. Obtained total Fe concentration is 20.67g / L, total SO 4 2- The concentration is 81.00g / L, the total Cr concentration is 5.00g / L, the total Ni concentration is 1.93g / L, the total Mn concentration is 1.40g / L, the total Cu concentration is 0.04g / L, and the total Si concentration is 0.02g / L The liquid phase of L.

[0050] (2) Chemically mineralize the liquid phase obtained above in a shaker with a rotating speed of 180r / min and a temperature of 28°C. The reaction conditions are: add 1.1mL hydrogen peroxide every half hour, and add 6 times in total; The initial pH is 2.5; the reaction time is 24h. After mineralization, the suction filt...

Embodiment 2

[0056] A method for treating stainless steel pickling wastewater and synchronously synthesizing secondary iron minerals, the process is as follows figure 1 As shown, the method includes the following steps:

[0057] (1) Get 250ml pH=0.04 stainless steel pickling wastewater, then add 20g CaCl 2 , after stirring and reacting for 1 h, solid-liquid separation was carried out under the conditions of 6000 g and 10 min using a centrifuge. Obtain 49.11g sludge, and pretreated liquid phase;

[0058] (2) The liquid phase obtained above was chemically mineralized in a shaker with a rotating speed of 180r / min and a temperature of 28°C. The reaction conditions were: adding 20mL of hydrogen peroxide; the initial pH of the reaction was 2.5; the reaction time was 24h. After mineralization, use a centrifuge to separate the solid and liquid under the condition of 6000g and 10min to obtain liquid phase and solid phase minerals. The solid phase was washed three times with dilute sulfuric acid ...

Embodiment 3

[0064] In this example, trivalent arsenic is used as the adsorption object to study the adsorption capacity of the solid-phase minerals obtained in Examples 1 and 2.

[0065] The mineral obtained in embodiment 1 is denoted as Sch 1, and the mineral obtained in embodiment 2 is denoted as Sch 2, and the trivalent arsenic adsorption capacity determination method is:

[0066] (1) Accurately weigh 0.010g Sch 1 and Sch 2 respectively, add to 10mg / L~400mg / L trivalent arsenic solution, adjust the pH value of the solution to 7.0, shake in a shaker at 25°C and 180r / min. Monitor the pH value of the solution every 0.5h and re-adjust the pH value to 7.0. After 4h, take a sample, pass through a 0.45μm filter membrane, and measure the content of trivalent arsenic.

[0067] (2) Draw the adsorption isotherms of the two minerals for trivalent arsenic. The results are shown in Table 3. According to the Langmuir formula, the maximum adsorption capacities of Sch 1 and Sch 2 for trivalent arsenic a...

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Abstract

The invention discloses a method for treating stainless steel pickling wastewater and synchronously synthesizing secondary iron minerals, which belongs to the field of sewage treatment. The specific process is chemical mineralization combined with alkali neutralization treatment and comprises the following detailed treatment steps of firstly, pretreating the pickling wastewater, adding an oxidizing agent into the pretreated liquid phase for chemical mineralization treatment, collecting the generated secondary iron mineral precipitate, then carrying out alkali neutralization treatment on the solution part, and increasing the pH value to be neutral. According to the technology, efficient treatment of the stainless steel pickling wastewater can be achieved, the alkali consumption can be remarkably reduced through the technology, the amount of generated toxic neutralization sediment is reduced, meanwhile, hydroxyl ferric sulfate minerals with excellent adsorption performance are recycled, and the technology is an economical and efficient technology for treating the stainless steel pickling wastewater.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a treatment process for stainless steel pickling wastewater. Background technique [0002] Stainless steel is widely used because of its excellent corrosion resistance. In recent years, with the rapid growth of stainless steel consumption, my country's stainless steel output has grown rapidly, ranking first in the world since 2006, and reaching 11.6 million tons in 2009. The production of stainless steel must go through annealing, normalizing, quenching, welding and other processing processes, and black oxide skin will be formed on the surface. Oxide skin not only affects the appearance quality, but also has an adverse effect on the subsequent processing of the product. Therefore, it is often removed by surface treatment methods such as pickling and polishing before subsequent processing. The stainless steel pickling process is generally to use sulfuric acid to pre-cle...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F1/28B01J20/02B01J20/30C01G49/14C02F1/72C02F1/66C02F101/10C02F101/20C02F103/16
CPCC02F1/722C02F1/66C02F1/281B01J20/0225B01J20/0274C01G49/14C02F2101/101C02F2101/203C02F2103/16C02F2101/103B01J2220/4887C01P2004/03C01P2002/72
Inventor 周立祥王晓萌王丹
Owner NANJING AGRICULTURAL UNIVERSITY
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