Method of removing impurities in finished iron black produced with wastes and application of method

A technology of iron black and products, which is applied in the field of environmental protection waste recycling, can solve the problems of increasing operating costs and large consumption of cleaning water, so as to reduce production costs, solve the problem of salty wastewater, and achieve good economic and environmental benefits Effect

Pending Publication Date: 2019-04-05
天津市国润永泰环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, on the one hand, the traditional solution has undergone several stages of water washing, and the consumption of washing water is particularly large; on the other hand, the impurities removed from the washing contain a large amount of inorganic salts, which exceed the relevant national drainage standards, and need to be treated separately, which increases operating costs.

Method used

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  • Method of removing impurities in finished iron black produced with wastes and application of method

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Experimental program
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Effect test

Embodiment 1

[0037] A method for removing impurities from waste production iron black removal products:

[0038] (1) First, set up a three-stage offline washing high-pressure plate and frame filter press and a first-stage online washing high-pressure plate and frame filter press; the first-level offline cleaning system: an online washing high-pressure plate and frame filter press and a washing tank; cleaning The cleaning water of the system comes from the desalted water or tap water of the evaporative crystallization system in the subsequent process, and the cleaning water directly enters the cleaning water inlet of the online washing high-pressure plate and frame filter press for online cleaning of iron black products. The rinsing project after the production of iron black products by using pickling waste hydrochloric acid and pickling sludge in a steel company was selected.

[0039] (2) Set up a beating tank and a buffer tank in each level of offline washing to facilitate the thorough mi...

Embodiment 2

[0048] As shown in accompanying drawing, the method that the present invention utilizes waste production iron black to remove product removal of impurities is:

[0049] First, the iron-black mixed liquor passes through the first-level off-line cleaning system, the second-level off-line cleaning system, the third-level off-line cleaning system and the on-line cleaning system.

[0050] Each level of off-line cleaning system includes off-line cleaning filter press, slurry tank, slurry tank, washing water tank and auxiliary lift pump. The off-line cleaning filter press dehydrates the iron black product in the mixture to form a filter cake with a moisture content of 40%.

[0051] The beating tank fully mixes the filter cake produced by the filter press with the filtered filtrate discharged from the upper stage to dilute the concentration of inorganic salts in the filter cake.

[0052] The slurry tank acts as a buffer tank, that is, to store the iron-black mixed liquid formed in th...

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Abstract

The invention provides a method of removing impurities in finished iron black produced with wastes. The method includes: setting a three-stage offline washing high-pressure plate-frame filter press and a primary online washing high-pressure plate-frame filter press; setting a pulping trough and a buffer trough in each stage of offline washing so that full mixing of every stage of washing water andfinished iron black is facilitated, and washing effect is improved; passing the finished iron block through three-stage offline washing and primary online washing once in a forward feeding manner, and reversely feeding washing water to a washing system from an online washing terminal and reversely pass through every stage of offline washing system; allowing outflow of a clear water trough of thelast stage of offline washing system to enter an evaporative crystallization system so as to recycle industrially valued salts in the wastewater. The method helps improve the quality of finished ironblack, and may also combine with the evaporative crystallization technique to form industrial products with the principal salts in the wastewater via crystallization and separation, so that the salinewastewater problem is thoroughly solved.

Description

technical field [0001] The invention relates to the technical field of environmental protection waste recycling, in particular to a method for removing impurities in iron black products when using waste hydrochloric acid and waste iron sheets to produce iron black pigments. Background technique [0002] During the processing of metal products in the iron and steel industry, there will be a large amount of iron oxide scale on the surface of the metal product. In order to ensure the smooth progress of various subsequent processing procedures, the iron oxide scale on the surface of the metal product must be removed by pickling. In the pickling process, when the concentration of ferrous ions formed by the dissolved iron oxide in the acid solution accumulates to a certain level, the pickling solution cannot meet the process requirements and becomes a pickling waste solution, which is classified as a hazardous waste. Special handling is required. After the pickling of metal produ...

Claims

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Application Information

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IPC IPC(8): C01G49/08
CPCC01G49/08
Inventor 戴承昊
Owner 天津市国润永泰环保科技有限公司
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