Novel process for preparing iron oxide red by recycling sludge

A technology of iron oxide red and a new process, which is applied in the direction of iron oxide, iron oxide/iron hydroxide, sludge treatment, etc. It can solve the problems of complex preparation process, unfavorable production and use, and cumbersome process, so as to improve purity and avoid reaction Dramatic, simple and efficient process

Inactive Publication Date: 2020-11-27
湖南三环颜料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The preparation process of the prior art is complicated and the process is cumbersome, which is unfavorable for production and use
Therefore, it is necessa...

Method used

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  • Novel process for preparing iron oxide red by recycling sludge
  • Novel process for preparing iron oxide red by recycling sludge

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The new technique of reclaiming and utilizing sludge of the present embodiment to prepare iron oxide red, concrete steps are as follows:

[0022] Step 1) raw material preparation: measure the solid content of the sludge after sewage treatment recovery and neutralization (mainly measure the iron content therein), determine its feeding amount (in terms of iron content); the sewage treatment recovery neutralization The final sludge mainly contains FeSo 4 .7H 2 O, Fe(OH) 2 , Fe 2 o 3 .nH 2 O and other substances;

[0023] Step 2) Add sludge and green vitriol solution (FeSO4 7H2O 100%) in the feeding bucket, after stirring and dissolving, add alkali solution, after the pH value is adjusted to 7, continue to add the alkali solution of 1% sludge weight , join 500m 3 / h air is blown, heated to 90-102 at the same time, and oxidized to brownish red; the vitriol solution is a light blue green transparent liquid with a concentration of 35g / ml and a pH of 5; the alkali soluti...

Embodiment 2

[0026] The new technique of reclaiming and utilizing sludge of the present embodiment to prepare iron oxide red, concrete steps are as follows:

[0027] Step 1) raw material preparation: measure the solid content of the sludge after sewage treatment recovery and neutralization (mainly measure the iron content therein), determine its feeding amount (in terms of iron content); the sewage treatment recovery neutralization The final sludge mainly contains FeSo 4 .7H 2 O, Fe(OH) 2 , Fe 2 o 3 .nH 2 O and other substances;

[0028] Step 2) Add sludge and green vitriol solution (FeSO 7H 2 O 100%) in the feeding bucket, after stirring and dissolving, add alkali solution, after the pH value is adjusted to 7, continue to add the alkali solution of 5% sludge weight , join 800m 3 / h air is blown, heated to 90-102 at the same time, and oxidized to brownish red; the green vitriol solution is a light blue green transparent liquid, with a concentration of 35g / ml, and a pH of 3; the alka...

Embodiment 3

[0031] The new technique of reclaiming and utilizing sludge of the present embodiment to prepare iron oxide red, concrete steps are as follows:

[0032] Step 1) raw material preparation: measure the solid content of the sludge after sewage treatment recovery and neutralization (mainly measure the iron content therein), determine its feeding amount (in terms of iron content); the sewage treatment recovery neutralization The final sludge mainly contains FeSo 4 .7H 2 O, Fe(OH) 2 , Fe2 o 3 .nH 2 O and other substances;

[0033] Step 2) Add sludge and green vitriol solution (FeSO4 7H2O 100%) in the feeding bucket, after stirring and dissolving, add alkali solution, after the pH value is adjusted to 7, continue to add the alkali solution of 3% sludge weight , adding 600m 3 / h air is blown, heated to 90-102 at the same time, and oxidized to brownish red; the vitriol solution is a light blue green transparent liquid with a concentration of 40g / ml and a pH of 4; the alkali soluti...

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Abstract

The invention discloses a novel process for preparing iron oxide red by recycling sludge. The novel process comprises the following steps of: 1) preparing raw materials: measuring the solid content ofneutralized sludge after sewage treatment and recycling; 2) adding sludge and a copperas solution into a feeding barrel, uniformly stirring and mixing, adding an alkaline solution, adjusting the pH value, continuously adding the alkaline solution, adding air for blowing, and heating and oxidizing to brownish red; and 3) adding scrap iron skin into the feeding barrel for heating oxidation, addinga copperas solution, adding air for oxidation, controlling according to the color progress condition of the reaction barrel, starting sampling and color comparison when the target color is close, andfinally obtaining the iron oxide red pigment with pure color. The technological process is simple, and the prepared iron oxide red is high in purity and pure in color.

Description

technical field [0001] The invention relates to the technical field of sludge treatment, in particular to a new process for preparing iron oxide red by recycling sludge. Background technique [0002] The sludge obtained after wastewater recycling treatment is likely to cause secondary pollution. The traditional treatment and disposal methods are mainly landfill or incineration. The landfill method is simple and easy to implement, but it needs to occupy a large amount of land, and if it is not handled properly, it is easy to cause secondary pollution problems such as groundwater and soil. Incineration can effectively reduce the amount of sludge, but the one-time investment and treatment costs of incineration are often Higher, and the incineration flue gas needs further treatment. Therefore, according to the concept of circular economy, using the effective components in sludge to produce high value-added products, so as to realize the resource utilization of sludge has becom...

Claims

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Application Information

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IPC IPC(8): C01G49/06C02F11/00
CPCC01G49/06C02F11/00
Inventor 谢晓玲彭德仁朱子刚
Owner 湖南三环颜料有限公司
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