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Method for improving cement solidified chromium slag and product thereof

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: 2020-06-30
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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  • Method for improving cement solidified chromium slag and product thereof
  • Method for improving cement solidified chromium slag and product thereof
  • Method for improving cement solidified chromium slag and product thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1 Effect of concentration of acetic acid on the properties of solidified chromium slag

[0025] Grind the chromium slag and pass through a 200-mesh sieve to obtain chromium slag powder. Add acetic acid into water to prepare 0.05M, 0.07M, 0.09M, 0.1M, 0.15M, 0.2M, 0.21M, 0.23M, 0.25M aqueous acetic acid solutions. According to the liquid-solid ratio of 0.8:1mL / g, the acetic acid aqueous solution and the chromium slag powder were mixed and stirred for 30 minutes to obtain nine groups of chromium slag slurry. According to the mass ratio of sodium peroxodisulfate and chromium slag slurry of 3:100, sodium peroxodisulfate was mixed into the chromium slag slurry, and stirred until the sodium peroxodisulfate was completely dissolved to obtain nine groups of sulfur-doped chromium slag slurry. According to the mass ratio of aluminum ash and calcium oxide of 10:100, aluminum ash and calcium oxide were weighed respectively, mixed, and mixed powder was added. According to ...

Embodiment 2

[0037] Example 2 The effect of the mass ratio of sodium peroxodisulfate and chrome slag acid slurry on the performance of solidified body solidified chromium slag

[0038] Grind the chromium slag and pass through a 300-mesh sieve to obtain chromium slag powder. Acetic acid was added to water to prepare 0.2M aqueous acetic acid solutions. Mix the acetic acid aqueous solution and the chromium slag powder according to the liquid-solid ratio of 1:1 mL / g, and stir for 45 minutes to obtain the chromium slag slurry. According to the mass ratio of sodium persulfate to chrome slag acid pulp 1:100, 2:100, 2.5:100, 3:100, 5:100, 7:100, 7.5:100, 8:100, 9:100 Sodium sulfate is mixed into the chromium slag acid slurry, and stirred until the sodium peroxodisulfate is completely dissolved to obtain nine groups of sulfur-doped chromium slag acid slurry. According to the mass ratio of aluminum ash and calcium oxide of 20:100, aluminum ash and calcium oxide were weighed respectively, mixed, an...

Embodiment 3

[0043] Example 3 The influence of the mass ratio of aluminum ash and calcium oxide on the properties of solidified chromium slag

[0044] Grind the chromium slag and pass through a 400-mesh sieve to obtain chromium slag powder. Add acetic acid to water to prepare 0.2M aqueous acetic acid solution. Mix the acetic acid aqueous solution and the chromium slag powder according to the liquid-solid ratio of 1.2:1 mL / g, and stir for 60 minutes to obtain the chromium slag slurry. According to the mass ratio of sodium peroxodisulfate and chromium slag slurry of 7:100, sodium peroxodisulfate is mixed into the chromium slag slurry, and stirred until the sodium peroxodisulfate is completely dissolved to obtain sulfur-doped chromium slag slurry. According to the mass ratio of aluminum ash and calcium oxide 5:100, 7:100, 9:100, 10:100, 20:100, 30:100, 31:100, 33:100, 35:100, weigh aluminum ash and calcium oxide Calcium, mix, get nine groups and add mixed powder. According to the sulfur mi...

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Abstract

The invention discloses a method for improving cement solidified chromium slag, which comprises the following steps: grinding and sieving chromium slag to obtain chromium slag powder; mixing an aceticacid aqueous solution with the chromium slag powder, and stirring to obtain chromium slag acid slurry; mixing sodium peroxydisulfate into the chromium slag acid slurry, and stirring until the sodiumperoxydisulfate is completely dissolved to obtain sulfur-doped chromium slag acid slurry; weighing aluminum ash and calcium oxide, and mixing to obtain externally added mixed powder; and respectivelyweighing the sulfur-doped chromium slag acid slurry, an externally added mixed powder and cement, mixing, uniformly stirring, putting an obtained mixture into a mold, and curing to obtain a chromium slag cement solidified body. The invention further discloses the chromium slag cement solidified body. By means of the method, reduction detoxification of chromium in the acid-leached state in the chromium slag can be achieved, and the chromium slag can be fully wrapped by generating ettringite, calcium acetate and chromium hydroxide to strengthen the hydrated calcium silicate hardening process. The uniaxial compressive strength of the chromium slag cement solidified body prepared through the method is 67.35% higher than that of a traditional chromium slag cement solidified body, and the leaching toxicity of hexavalent chromium is lower than that of the domestic waste landfill pollution control standard (GB16889-2008).

Description

technical field [0001] The invention relates to the field of harmless disposal of hazardous solid waste, in particular to a method for improving cement-solidified chromium slag and a product thereof. Background technique [0002] Chromium slag is an industrial hazardous solid waste produced during the production of chromium salts and metallic chromium. In my country, the production of 1 ton of chromium salt and 1 ton of metal chromium can discharge 3 tons and 7 tons of chromium slag respectively. A large amount of chromium slag not only invades a large amount of land during the stockpiling process, but also leaches water-soluble chromium pollutants after being rained. Hexavalent chromium is the main pollutant in chromium slag. It has the characteristics of high toxicity, high solubility, and carcinogenicity. It can accumulate in human tissues through various channels, causing nervous system disorders and inducing cell cancer. Therefore, if the chromium slag is discharged i...

Claims

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Application Information

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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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