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A method for improving cement solidified chrome slag and its product

A technology of cement solidification and chrome slag, which is applied in the field of harmless disposal of hazardous solid waste, and can solve problems such as the reduction of solidified body strength

Active Publication Date: 2021-10-19
CHANGSHU INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although too much ferrous or zero-valent iron can convert highly toxic and highly mobile hexavalent chromium into highly toxic and highly mobile trivalent chromium, excessive ferric iron will affect the cement hydration process and lead to solidification Intensity is further reduced

Method used

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  • A method for improving cement solidified chrome slag and its product
  • A method for improving cement solidified chrome slag and its product
  • A method for improving cement solidified chrome slag and its product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1 Effect of acetic acid concentration on cured body curing chromium residue

[0025] The chromium residue is ground, and the 200 mesh sieve is obtained. A acetic acid solution was formulated in water, 0.05 m, 0.07 m, 0.09 m, 0.1 m, 0.15 m, 0.2 m, 0.21 m, 0.23 m, 0.25 M, a acetic acid solution. The aqueous solution of acetic acid and chromium residue powder was mixed according to liquid solid ratio of 0.8: 1 mL / g, stirred for 30 minutes, and the nine-group chromium slag acid pulp was obtained. Following sodium sodium sodium sulfate and chromium slabs were mixed into chromium slabs in 3:100, stirred until the sodium sulfate was completely dissolved, and the nine sets of sulfur droolite delate. Aluminum ash and calcium oxide, mixed, and mixed with aluminum oxide, mixed, and additionally added mixed powders. According to the sulfur drooprogen: additional mixed powder: cement mass rather than 40:5: 100 Group chrome slag cement cured body.

[0026] Single-axial compress...

Embodiment 2

[0037] Example 2 Effect of sodium hyperodaryate and chromium residue mass compared to cured body solidified chrome

[0038] The chromium residue was ground, and the 300 mesh sieve was obtained, and the chrome slag powder was obtained. The acetic acid was added to water, and 0.2 M a aqueous solution was formulated. The aqueous solution of acetic acid and chromium residue powder was mixed according to liquid solid ratio of 1: 1 ml / g, stirred for 45 minutes, and chrome slabs. According to the mass of sodium sodium sulfate and chromium slag, 2:100, 2:100, 2.5:100, 3:100, 5:100, 7:100, 7.5:100, 8:100, 9:100 will pass two Sodium sulfate is mixed into the chromium slabs, stirred to sodium sulfate is completely dissolved, and the nine sets of sulfur bleed chromery. Aluminum ash and calcium oxide, mixed, and mixed with aluminum oxide, mixed, and additionally added mixed powders. According to the sulfur drooprogen: additional mixed powder: cement mass rather than 60:10: 100 Group chrome s...

Embodiment 3

[0043] Example 3 Effect of aluminum ash and calcium oxide mass compared to cured body solidified chrome

[0044] The chromium residue is ground, and the 400 mesh sieve is obtained. The acetic acid was added to water, and 0.2 M a aqueous solution was formulated. The aqueous solution of acetic acid and chromium residue powder was mixed according to liquid solid ratio of 1.2: 1 ml / g, stirred for 60 minutes, and chrome slabs. According to sodium sodium sulfate, sodium sodium sodium sodium sodium sulfate is mixed into chromium slabs, stirred to sodium sulfide, and sulfur drooproid. Co-aluminum ash and oxidation Calcium, mixed, adding a mixed powder addition in nine groups. According to the sulfur droopolymeral tester: additional mixed powder: cement mass rather than 80:15: 100 Group of chrome slag cement solidification blocks.

[0045] Uniaxial compressive strength detection, chromium immersion toxicity detection, chromium curing ratio, cured body corrosion resistance test, corrosion...

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Abstract

The invention discloses a method for improving cement solidification of chromium slag, which comprises the following steps: grinding and sieving chromium slag to obtain chromium slag powder; mixing acetic acid aqueous solution and chromium slag powder, and stirring to obtain chromium slag slurry; Sodium sulfate is mixed into the chromium slag slurry, and stirred until the sodium peroxodisulfate is completely dissolved to obtain the sulfur-doped chromium slag slurry; the aluminum ash and calcium oxide are weighed and mixed to obtain an externally added mixed powder; the sulfur-doped chromium slag is weighed separately Physalis, externally added mixed powder and cement, mixed, stirred evenly, molded, cured, to obtain chromium slag cement solidified body. The invention also discloses a chromium slag cement solidified body. The method of the invention can not only realize the reduction and detoxification of chromium in the acid leachable state in the chromium slag, but also strengthen the hardening process of the hydrated calcium silicate by generating ettringite, calcium acetate and chromium hydroxide, so as to fully wrap the chromium slag. The uniaxial compressive strength of the chromium slag cement solidified body prepared by the present invention is 67.35% higher than that of the traditional chromium slag cement solidified body, and the leaching toxicity of hexavalent chromium is lower than "Standards for Pollution Control of Domestic Garbage Landfill Sites" (GB16889-2008 ).

Description

Technical field [0001] The present invention relates to the field of hazardous solid waste harmless treatment, and more particularly to a method of improving cement cured chromium residue and its products. Background technique [0002] Chromium residers are industrial hazardous solid waste produced during chromium salt and metal chromium. In China, producing 1 ton of chromium salt and 1 ton of metal chromium can emit 3 tons and 7 tons of chromium residue separately. A large amount of chrome slabs not only invaders a large amount of land not only during the stack, but also leaks water-soluble chrome contaminants after rain. Hexavalent chromium is the main contaminants in chromium residers, with high toxicity, high solubility, carcinogenicity, etc., can accumulate in human tissue and induce cell carcinoma in human tissue through a variety of pathways. Therefore, if you do not deal with it, it is not only destroying the ecological environment, but also harms human health. At present...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/10
CPCC04B28/10C04B2201/50C04B18/144C04B24/04C04B22/147C04B7/00
Inventor 黄涛张克刘万辉张树文宋东平金俊勋周璐璐徐娇娇
Owner CHANGSHU INSTITUTE OF TECHNOLOGY
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