A kind of chromium slag biological detoxification and method for preparing bio-organic fertilizer

A bio-organic fertilizer and chromium slag technology, which is applied in the preparation of organic fertilizers, organic fertilizers, bio-organic part treatment and other directions, can solve the problem that chromium slag cannot be effectively utilized, and achieves good detoxification effect, low cost, and hexavalent chromium. The effect of content reduction

Active Publication Date: 2019-03-01
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this method needs to add a large amount of acid to adjust the pH value, and the chromium slag after treatment cannot be effectively utilized

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] According to the mass ratio (dry weight) of urban sludge and chromium residue of 1:1, weigh 600g (dry weight) of urban sludge and 600g (dry weight) of chromium residue, mix well, and add 530g straw as conditioning Straw accounts for about 45% of the total amount of biological solid waste and chromium slag, so that the C / N in the heap is 26, and the moisture content of the heap is about 50%. Turn the pile twice a day at the beginning, turn once a day after one week, and the ventilation volume is 0.5m 3 / min, keeping the oxygen content of the heap at 20%; the composting time is 35 days, during the composting process, the temperature of the heap is raised from 30°C to 55°C within 5 days, then kept at 55°C for 10 days, and then increased from 55°C Lower the temperature to 30°C, and keep the compost temperature at 30°C until the composting ends.

[0043] Regularly sample and analyze the leaching toxicity of chromium slag after detoxification and the existing form of chromiu...

Embodiment 2

[0046] According to the ratio of cow dung and chromium slag mass ratio (dry weight) 1:1, weigh 600g (dry weight) of cow dung and 600g (dry weight) of chromium slag respectively, fully mix, and add 215g straw as a conditioner, about Accounting for 18% of the total amount of biological solid waste and chromium slag, the C / N of the heap is 30, and the moisture content of the heap is about 60%. time, one week later, turn the pile once a day, with a ventilation volume of 0.35m 3 / min, keep the oxygen content at 15%; the composting time is 30 days, during the composting process, the temperature of the compost body is raised from 30°C to 55°C within 5 days, then kept at 55°C for 10 days and then cooled from 55°C to 30°C °C, keep the compost temperature at 30 °C until the end of composting.

[0047] Regularly sample and analyze the leaching toxicity of chromium slag after detoxification and the existing form of chromium. The leaching toxicity of chromium is leached by HJ / T299 sulfuri...

Embodiment 3

[0050] According to the ratio of chicken manure and chromium slag mass ratio (dry weight) 1:1, weigh chicken manure 600g (dry weight) respectively, chromium slag 600g (dry weight), fully mix, and add 515g straw as conditioning agent, about Accounting for 43% of the total amount of biological solid waste and chromium slag, the mass ratio of C / N is 24. Add 1500g of water so that the moisture content of the compost is about 80%. The compost adopts the oxygen supply method of turning and aeration. The composting is turned twice a day at the beginning of the composting period, and turned once a day after a week. The ventilation volume is 0.35m 3 / min, keeping the oxygen content of the heap at 15%; the composting time is 40 days, during the composting process, the temperature of the heap is raised from 30°C to 55°C within 5 days, then kept at 55°C for 10 days, and then increased from 55°C Lower the temperature to 30°C, and keep the compost temperature at 30°C until the composting en...

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Abstract

The invention provides a method for biological detoxification of chromium slag and preparation of a biological organic fertilizer. The method comprises the steps: mixing biological solid waste, the chromium slag and an organic conditioner, then carrying out aerobic composting, to obtain the biological organic fertilizer having the hexavalent chromium content reaching standards. The biological solid waste and the organic conditioner are adopted for composting to detoxify the chromium slag, the waste is used for treating the waste, and the method has the characteristics of low investment, low cost, diverse treatment ways, good detoxification effect and the like; and the biological organic fertilizer prepared after composting can realize resource utilization of the chromium slag directly.

Description

technical field [0001] The invention belongs to the technical field of cleaning treatment and resource utilization of chromium slag, and in particular relates to a method for biological detoxification of chromium slag and preparation of bio-organic fertilizer. Background technique [0002] Chromium slag is the Cr(Ⅵ)-containing waste slag produced during the production and application of chromium compounds, which includes mixing chromite ore with soda ash (or caustic soda) in a certain proportion in the industrial production process of chromium compounds and then roasting at high temperature (or liquid phase oxidation) reaction, and the Cr(Ⅵ)-containing residue obtained after chromate leaching and separation, also includes industrial processes such as iron and steel, nonferrous metals, chemical industry, electroplating, and leather tanning, which are produced due to the use of chromium-containing raw materials for processing Cr(VI)-containing waste residue. Cr(Ⅵ) contained i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05F17/00
CPCY02W30/40
Inventor 徐红彬陈辉霞豆俊峰张红玲张懿
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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