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Method for inhibiting Cr(III) oxidation in process of tanning sludge incineration

A technology of tannery sludge and inhibitors, applied in the direction of combustion method, incinerator, combustion type, etc., can solve the problems of trivalent chromium oxidation, etc., and achieve the effect of fast reaction speed, remarkable effect and simple components

Inactive Publication Date: 2017-07-04
NANJING SREMOL ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The problem to be solved by the present invention is to solve the problem of trivalent chromium oxidation existing in the existing tannery sludge incineration process, especially to solve the problem of Cr(III) oxidation under high temperature conditions, and propose a ta

Method used

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  • Method for inhibiting Cr(III) oxidation in process of tanning sludge incineration
  • Method for inhibiting Cr(III) oxidation in process of tanning sludge incineration
  • Method for inhibiting Cr(III) oxidation in process of tanning sludge incineration

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Embodiment 1

[0020] Using the laboratory to simulate the oxidation process of Cr(III) in the incineration process of tannery sludge, and analyze the pure reagent Cr 2 o 3 The simulated sludge composed of CaO and CaO (the ratio of the amount of Ca substance in the sludge to the amount of Cr substance n(Ca) / n(Cr)=1) was mixed with a ball mill for 30 minutes. The component of suppressor is made up of: 40wt% (NH 4 ) 3 PO 4 , 30wt% (NH 4 ) 2 HPO 4 and 30 wt% NH 4 h 2 PO 4 , the inhibitor was added to the simulated sludge and mixed by a ball mill for 10 minutes. The amount of inhibitor added was the ratio of the amount of P substance in the inhibitor to the amount of Ca substance in the simulated sludge, n(P) / n(Ca)=0.5 . The mixed material is treated at high temperature in a muffle furnace for 1 hour. The heating rate of the muffle furnace is 5°C / min, and the treatment temperature is 500-1200°C. The inhibitory effect of Cr(III) is as figure 1 , at 900°C, the oxidation rate of Cr(III)...

Embodiment 2

[0022] Using the laboratory to simulate the oxidation process of Cr(III) in the incineration process of tannery sludge, and analyze the pure reagent Cr 2 o 3 The simulated sludge composed of CaO and CaO (the ratio of the amount of Ca substance in the sludge to the amount of Cr substance n(Ca) / n(Cr)=1), was mixed by a ball mill, and the mixing time was 30min. Become: 40wt% (NH 4 ) 3 PO 4 , 30wt% (NH 4 ) 2 HPO 4 and 30 wt% NH 4 h 2 PO 4 , the inhibitor was added to the simulated sludge and mixed by a ball mill for 10 minutes. The amount of inhibitor added was the ratio of the amount of P substance in the inhibitor to the amount of Ca substance in the simulated sludge, which was n(P) / n(Ca)=1.5 . The mixed material is treated at high temperature in a muffle furnace for 1 hour. The heating rate of the muffle furnace is 5°C / min, and the treatment temperature is 500-1200°C. The inhibitory effect of Cr(III) is as figure 2 , at 900°C, the oxidation rate of Cr(III) dropped ...

Embodiment 3

[0024] Using the laboratory to simulate the oxidation process of Cr(III) in the incineration process of tannery sludge, and analyze the pure reagent Cr 2 o 3The simulated sludge composed of CaO and CaO (the ratio of the amount of Ca substance in the sludge to the amount of Cr substance n(Ca) / n(Cr)=1) was mixed with a ball mill for 30 minutes. The component of suppressor is made up of: 40wt% (NH 4 ) 3 PO 4 , 30wt% (NH 4 ) 2 HPO 4 and 30 wt% NH 4 h 2 PO 4 , the inhibitor was added to the simulated sludge and mixed by a ball mill for 10 minutes. The amount of the inhibitor added was the ratio of the amount of P substance in the inhibitor to the amount of Ca substance in the simulated sludge, n(P) / n(Ca)=2.0 . The mixed material is treated at high temperature in a muffle furnace for 1 hour. The heating rate of the muffle furnace is 5°C / min, and the treatment temperature is 500-1200°C. The inhibitory effect of Cr(III) is as image 3 , at 900°C, the oxidation rate of Cr(I...

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Abstract

The invention relates to the field of solid waste incineration, in particular to a method for inhibiting Cr(III) from being oxidized into Cr(VI) in the process of tanning sludge incineration. The method comprises the following steps that an inhibitor is added to tanning sludge, the inhibitor comprises 40-60 wt% of (NH4)3PO4, 30-50 wt% of (NH4)2HPO4 and 10-30 wt% of NH4H2PO4, and the additive amount of the inhibitor is the ratio, of 0.5-2.5, of the sum of the amount of P matter in the inhibitor and the amount of matter of alkali metal and alkaline-earth metal, such as Na, K and Ca, in the tanning sludge; the inhibitor and the tanning sludge are mixed evenly through a ball mill, and the mixing time ranges from 10 min to 30 min; and the evenly mixed materials are put into a high-temperature furnace and subjected to high-temperature treatment, the temperature ranges from 500 DEG C to 1,200 DEG C, and the treatment time is 1 h. By the adoption of the method, the reaction speed is high, the inhibitor is simple in component and remarkable in effect, and the method not only can be used for the incineration process of the tanning sludge, but also can be used for the melting and solidification processes of household refuse incineration fly ash.

Description

technical field [0001] The invention relates to the field of solid waste incineration, in particular to a method for inhibiting the oxidation of Cr(III) into Cr(VI) during the incineration process of tannery sludge. Background technique [0002] Tannery sludge is a by-product produced in the process of wastewater treatment in the tannery industry. It not only contains a large amount of water, high concentrations of organic matter, heavy metals, but also contains toxic and harmful substances such as pathogenic bacteria. Sludge is unstable in nature, highly perishable, emits stench, and may provide a breeding ground for dangerous pathogenic microorganisms and parasite eggs. If it is piled up without any treatment, it will inevitably cause serious harm to the environment and people's production and life. Therefore, The treatment of tannery sludge has become an important issue restricting the development of tannery industry. [0003] At present, the traditional sludge treatment...

Claims

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Application Information

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IPC IPC(8): F23G7/00
CPCF23G7/001
Inventor 崔皓毛林强吕慧峰陈露白海静
Owner NANJING SREMOL ENVIRONMENTAL TECH