Application treatment method of chromium-containing waste acid sludge in stainless steel factory

A technology of application treatment and stainless steel, applied in the direction of chromium oxide/hydrate, etc., to achieve the effect of simple manufacturing process, increased added value and stable performance

Active Publication Date: 2012-11-21
佛山市中天荣环保新材料科技有限公司 +2
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Problems solved by technology

[0016] The technical problem to be solved by the present invention is: aiming at the problems existing in the treatment of chromium-containing waste acid slag in stainless steel factories in the prior art, a method for the application and treatment of chromium-containing waste acid slag in stainless steel factories is provided, which can ...

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  • Application treatment method of chromium-containing waste acid sludge in stainless steel factory
  • Application treatment method of chromium-containing waste acid sludge in stainless steel factory
  • Application treatment method of chromium-containing waste acid sludge in stainless steel factory

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preparation example Construction

[0054] 3) Preparation of colorants:

[0055] The ferrochromium oxide mixture is directly used as ceramic and glass pigments;

[0056] Or the chromium-iron oxide mixture is used as a raw material for synthesizing ceramic pigments and glass pigments.

[0057] Pigment preparation adopts Fe-Cr, Fe-Cr-Co, Fe-Cr-Co-Mn series pigments, the specific method is:

[0058] Weigh the following raw materials by mass percentage:

[0059]

[0060] If the above percentage is 0, it means that the ferrochrome oxide mixture is directly used as a colorant, and is not used as a raw material for synthetic colorant.

[0061] The above-mentioned materials are mixed evenly according to a certain ratio, ground to 40 mesh to 600 mesh and fully mixed to make batch materials. Then the mixture is synthesized in a high-temperature furnace, the synthesis temperature is 600°C-1300°C, and the holding time is 0-168 hours.

Embodiment 1

[0062] Embodiment 1: ceramic green body black pigment

[0063] 1.1 Drying treatment of chromium-containing waste acid residue

[0064] The chromium-containing waste acid slag produced during the stainless steel pickling process with a water content of 25% is dried on a hot air drying line at 80° C. to remove the attached water and part of the crystallization water of the chromium-containing waste acid slag. Grind to about 50 mesh with a hammer mill.

[0065] 1.2 Preparation of ferrochromium oxide mixture

[0066] Combine the dried and pulverized chromium-containing waste acid slag with (NH 4 ) 2 SO 4 Mix evenly according to the ratio of 1:0.4, put it into a closed rotary kiln and heat and react to obtain a mixture of ferrochrome oxides. The heating temperature of the rotary kiln is 150 ° C, the atmosphere is an oxidizing atmosphere, and it is pulverized to about 250 mesh with a pulverizer. Cr 6+ .

[0067] 1.3 Preparation of black pigment for ceramic body

[0068] Weig...

Embodiment 2

[0071] Embodiment 2: ceramic green body brown pigment

[0072] 2.1 Drying treatment of chromium-containing waste acid residue

[0073] The chromium-containing waste acid slag generated during the stainless steel pickling process with a water content of 25% is dried through a hot air drying line at 200°C to remove the attached water and part of the crystallization water of the chromium-containing waste acid slag. Grind to about 50 mesh with a hammer mill.

[0074] 2.2 Preparation of ferrochromium oxide mixture

[0075] Combine the dried and pulverized chromium-containing waste acid slag with (NH 4 ) 2 SO 4 Mix evenly according to the ratio of 1:0.4; put it into a closed rotary kiln and heat and react to obtain a mixture of ferrochrome oxides. The heating temperature of the rotary kiln is 1380 ° C, and the atmosphere is an oxidizing atmosphere. Cr 6+ .

[0076] 2.3 Preparation of brown pigment for ceramic body

[0077] Weigh the crushed ferrochrome oxide mixture 15%, Fe ...

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Abstract

An application treatment method of chromium-containing waste acid sludge in stainless steel factories particularly comprises the following steps: 1) drying chromium-containing waste acid sludge generated during stainless steel production, passivation, and pickling technology processes at 80-20o DEG C by hot air or in the sun; 2) directly putting the dried chromium-containing waste acid sludge in a closed rotary kiln for heating reaction, or adding (NH4)2SO4 and then putting into the closed rotary kiln for heating reaction so as to allow all the acid sludge to convert into a ferrochromium oxide mixture, introducing the tail gas into limewash for tail gas harmless treatment; 3) directly using the ferrochromium oxide mixture as a ceramic pigment or a glass pigment, or using the ferrochromium oxide mixture as a raw material for synthesizing a ceramic pigment or a glass pigment. The invention eliminates the harm of chromium, saves resources, reduces the production cost of ceramic glass pigments, also reduces environment pollution, and changes waste into valuables.

Description

technical field [0001] The invention belongs to the technical field of industrial waste slag treatment, and in particular relates to an application treatment method for chromium-containing waste acid slag in a stainless steel plant. technical background [0002] With the rapid development of social economy, the use of stainless steel is increasing, and the resulting output is also increasing. With the growth of stainless steel consumption demand in China, South Korea, India and other emerging economies, the global stainless steel industry is accelerating the transfer to these countries. In 2009, under the background of declining stainless steel consumption demand in Europe and America, the global crude stainless steel output was 24.6 million tons. The output of stainless steel in Asia increased by 6.2%. Among them, the output of crude stainless steel in China reached 8.805 million tons, an increase of 26.8%. [0003] In the production process of stainless steel, it is inev...

Claims

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Application Information

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IPC IPC(8): C01G37/02C03C1/04
Inventor 廖红卫陈曙光李熹熙刘立力王林龙刘骁于泳泽陈孝军
Owner 佛山市中天荣环保新材料科技有限公司
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