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Method for treating stainless steel pickling sludge and preparing slag cement

A technology of pickling sludge and slag cement, which is applied in the field of metallurgy, can solve problems such as process pollution and sinter product quality decline, and achieve the effects of huge environmental and economic benefits, simple implementation, and low cost

Active Publication Date: 2022-01-25
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The common practice of enterprises is to stockpile or add a small amount to the sintering process, but this brings about a decline in the quality of sintered ore products and serious process pollution (CaSO 4 Decomposition produces SO 2 ) and other adverse effects, there is an urgent need for effective large-scale treatment methods

Method used

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  • Method for treating stainless steel pickling sludge and preparing slag cement
  • Method for treating stainless steel pickling sludge and preparing slag cement
  • Method for treating stainless steel pickling sludge and preparing slag cement

Examples

Experimental program
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Effect test

Embodiment 1

[0048] Embodiment 1 laboratory test

[0049] Dry the original stainless steel pickling sludge with a higher water content at 400°C for 2 hours to obtain a stainless steel pickling sludge with a water content of 1%, which is set aside;

[0050] The modifier is fly ash;

[0051] 10g of the stainless steel pickling sludge, 3g of modifier and 100g of blast furnace slag were mixed evenly and placed in a porcelain boat;

[0052] The porcelain boat was placed in a horizontal resistance furnace, the temperature was raised to 1450°C at a rate of 5°C / min, and the temperature was kept for 5 minutes to obtain molten slag.

[0053] Quickly pull the porcelain boat out of the high-temperature zone, and perform water quenching at a cooling rate of 400°C / min to obtain granulated slag;

[0054] The slag powder (the specific surface area is 689m 2 / kg) and Portland cement clinker in a mass ratio of 1:1 to obtain slag cement.

Embodiment 2

[0056] The preparation method is basically the same as in Example 1, except that the addition amount of the stainless steel pickling sludge is adjusted from "10g" to "5g".

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Abstract

The invention provides a method for treating stainless steel pickling sludge and preparing slag cement, and relates to the technical field of metallurgy. The method for treating the stainless steel pickling sludge and preparing the slag cement comprises the following steps: mixing stainless steel pickling sludge, molten blast furnace slag and a modifier to obtain molten slag; carrying out cold quenching on the molten slag to obtain granulated slag; grinding the granulated slag to obtain slag powder; and mixing the slag powder with Portland cement clinker to obtain the slag cement. According to the invention, stainless steel pickling sludge and molten blast furnace slag are mixed and then are subjected to cold quenching to obtain granulated slag, and then the slag powder obtained by grinding the granulated slag is used as a cement doping material to prepare slag cement, so that an effective way for recycling and harmlessly treating the stainless steel pickling sludge is provided.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a method for treating stainless steel pickling sludge and preparing slag cement. Background technique [0002] Stainless steel pickling sludge is a solid waste precipitated by adding lime to the wastewater produced by pickling in order to ensure the surface finish of stainless steel production. Because the leaching of Cr(Ⅵ) exceeds the national standard, it is clearly classified as hazardous solid waste. thing. The main component of stainless steel pickling sludge produced with sulfuric acid as pickling medium is Fe 2 o 3 20~35wt%, CaSO 4 45~60wt%, Cr 2 o 3 1~6wt%, SiO 2 2~3wt%, for this kind of pickling sludge, there is no effective treatment way at present. The common practice of enterprises is to stockpile or add a small amount to the sintering process, but this brings about a decline in the quality of sintered ore products and serious process pollution (CaSO 4 ...

Claims

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Application Information

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IPC IPC(8): C04B7/38C04B7/48C04B7/24
CPCC04B7/38C04B7/48C04B7/24Y02P40/10
Inventor 张延玲赵峥李昊堃武绍文张帅许香帅高朝辉
Owner UNIV OF SCI & TECH BEIJING
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