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Process for preparing cement clinker additive from stainless steel pickling sludge

A technology for pickling sludge and cement clinker, which is applied in the production process of cement clinker additives and in the field of stainless steel pickling sludge, which can solve problems such as environmental impact

Inactive Publication Date: 2020-10-30
清远市博发环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally speaking, the stainless steel pickling sludge produced by the pickling wastewater treated by the chemical precipitation method still contains certain pollutants such as nickel, chromium, and fluoride. Excessive amounts of heavy metals will have a great impact on the environment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Embodiment 1: add 5% ferrous sulfate powder and calcium hydroxide solution in the pickling waste water that stainless steel production enterprise produces, the content of calcium hydroxide in the calcium hydroxide solution is 10% of stainless steel pickling waste water, calcium hydroxide solution The concentration can be selected at will, and the precipitate stainless steel pickling sludge is obtained after the reaction. At this time, the moisture content of the sludge is 70%, and the chemical components in the stainless steel pickling sludge: CaO is 28.08%, SiO 2 1.13%, Al 2 o 3 0.85%, Fe 2 o 3 was 31.33%. 10% fly ash is added to the stainless steel sludge, and then the stainless steel pickling sludge is subjected to high-temperature treatment, and the drying temperature is 700°C, so that the moisture content of the sludge reaches 15%.

[0062] Grind the dried sludge into fine powder, then add kaolin with 4% of the total amount of stainless steel sludge, mix well a...

Embodiment 2

[0064] Embodiment 2: add 10% ferrous sulfate powder and calcium carbonate solution in the pickling waste water that stainless steel production enterprise produces, the content of calcium carbonate in the calcium carbonate solution is 11% of stainless steel pickling waste water, obtains precipitate stainless steel pickling dirt Sludge, at this time, the moisture content of the sludge is 60%, and the chemical composition in the stainless steel pickling sludge: CaO is 29.22%, SiO 2 2.19%, Al 2 o 3 is 1.28, Fe 2 o 3 was 26.44%. 8% fly ash was added to the stainless steel pickling sludge, and then the stainless steel pickling sludge was subjected to high temperature treatment, and the drying temperature was 800°C, so that the moisture content of the sludge reached 14%.

[0065] Grind the dried sludge to a fine powder, then add kaolin with 6% of the total amount of stainless steel sludge, mix well and use a granulator to obtain spherical particles with a diameter of 18mm; finall...

Embodiment 3

[0067]Embodiment 3: add 8% ferrous sulfate solution to the pickling waste water that stainless steel production enterprise produces, and 8% ferrous sulfate solution is to add the ferrous sulfate powder that mass fraction is 8% to dissolve in water and obtain, adopts ferrous sulfate Iron solution can better mix with pickling waste water, add calcium hydroxide solution simultaneously, the content of calcium hydroxide in the calcium hydroxide solution is 12% of stainless steel pickling waste water, obtains precipitate stainless steel pickling sludge, at this moment, The moisture content of the sludge is 65%, and the chemical components in the stainless steel pickling sludge: CaO is 27.85%, SiO 2 1.65%, Al 2 O3 is 1.71, Fe 2 o 3 was 25.81%. 9% fly ash was added to the stainless steel pickling sludge, and then the stainless steel pickling sludge was subjected to high temperature treatment, and the drying temperature was 600°C, so that the moisture content of the sludge reached 1...

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Abstract

The invention discloses a process for preparing a cement clinker additive from stainless steel pickling sludge, wherein the process comprises the following steps: S1, adding ferrous sulfate and liquidenvironment-friendly alkali into stainless steel pickling wastewater to obtain stainless steel pickling sludge; S2, adding fly ash into the stainless steel pickling sludge, uniformly mixing, and carrying out high-temperature dehydration treatment; S3, crushing and grinding the dewatered sludge into fine powder, adding 4%-6% of kaolin, uniformly mixing, and granulating; and S4, carrying out high-temperature calcination on the granulated material, and then crushing to obtain the clinker additive. According to the method, heavy metal ions in the pickling sludge generated in the stainless steel production process can be converted into harmless substances meeting the national environmental protection requirements; the content of metal Cr in the cement clinker obtained through the method is lower than 0.47%, the content of Ni in the cement clinker is lower than 0.06%, the quality of the cement clinker meets the index requirements of corresponding national product standards, reliability is high, and operation cost is low.

Description

technical field [0001] The invention belongs to the technical field of sludge resource utilization, and in particular relates to a production process of using stainless steel pickling sludge as a cement clinker additive. Background technique [0002] my country is a large stainless steel producing country, and a large amount of stainless steel products are produced every year. As a key link in the cold rolling process of stainless steel, it is necessary to dissolve the oxide film on the surface of stainless steel products (mainly composed of ferrous oxide) by pickling. (FeO), chromium oxide (Cr 2 o 3 ), manganese dioxide (MnO 2 ) and other components) and a chromium-free area layer to enhance the corrosion resistance of the stainless steel surface and produce a higher finish on the product surface. Commonly used pickling media include sulfuric acid, sodium sulfate, nitric acid + hydrofluoric acid, etc. The processing process is accompanied by the production of a large amo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B22/08
CPCC04B40/0046
Inventor 不公告发明人
Owner 清远市博发环保科技有限公司
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