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Method for restraining Cr(III) oxidization in tanning sludge incineration process

A technology for tannery sludge and inhibitor, which is applied in combustion methods, incinerators, combustion types, etc., can solve the problems of trivalent chromium oxidation and excessive content, and achieve the effects of fast reaction speed, simple components and remarkable effects.

Inactive Publication Date: 2018-01-19
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 Cr(VI) content in the fly ash and bottom slag after the treatment of chromium-containing solid waste under high temperature conditions The problem of exceeding the standard

Method used

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  • Method for restraining Cr(III) oxidization in tanning sludge incineration process
  • Method for restraining Cr(III) oxidization in tanning sludge incineration process
  • Method for restraining Cr(III) oxidization in tanning sludge incineration process

Examples

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example 1

[0016] 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 (n(Ca) / n(Cr)=1) was mixed with a ball mill for 30 minutes. The components of the inhibitor consist of: m((NH 4 ) 2 SO 4 ):m(NH 4 HSO 4 )=60:40, the inhibitor was added to the simulated sludge and mixed in a ball mill for 10 minutes, and the amount of inhibitor added was n(S) / 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) dropped from 16% to 10% without inhibitor.

example 2

[0018] 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 (n(Ca) / n(Cr)=1) was mixed with a ball mill for 30 minutes. The components of the inhibitor consist of: m((NH 4 ) 2 SO 4 ):m(NH 4 HSO 4 )=50:50, the inhibitor was added to the simulated sludge and mixed in a ball mill for 10 minutes, and the amount of inhibitor added was n(S) / 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 from 16% to 8% when no inhibitor was added.

example 3

[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 (n(Ca) / n(Cr)=1) was mixed with a ball mill for 30 minutes. The components of the inhibitor consist of: m((NH 4 ) 2 SO 4 ):m(NH 4 HSO 4 )=50:50, the inhibitor was added to the simulated sludge and mixed in a ball mill for 10 minutes, and the amount of inhibitor added was n(S) / n(Ca)=2.5. 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 image 3 , at 900°C, the oxidation rate of Cr(III) dropped from 16% to 0.24% without inhibitor.

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Abstract

The invention relates to a method for restraining Cr(III) oxidization in the tanning sludge incineration process, and particularly provides a Cr(III) oxidization restraining inhibitor and matching thereof. The inhibitor is composed of (NH4)2SO4 and NH4HSO4, wherein the mass percent of the (NH4)2SO4 ranges from 40% to 70%, and the mass percent of the NH4HSO4 ranges from 30% to 50%. An application method of the inhibitor comprises the steps that sludge is directly mixed for neutralizing, and a water solution is prepared. According to the optima usage concentration of the inhibitor, it is guaranteed that the substance amount ratio of the S content in an additive in an incinerator to the content of alkali metal and alkali earth metal in slurry is 2-2.5. According to the Cr(III) inhibitor, Cr(III) oxidization generated in the chromium containing sludge heat treatment process can be greatly reduced, and forming of Cr(VI) is obviously restrained. Through usage of the inhibitor, fly ash and bottom slag generated in the sludge incineration process can meet or basically meets the national hazardous waste Cr(VI) safety requirement, and the problem of Cr(VI) forming in the heat treatment process can be well solved. Meanwhile, the inhibitor has the beneficial effects that the reaction speed is high, and reaction is sufficient.

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
Inventor 毛林强汤润之苏鹏张文艺
Owner CHANGZHOU UNIV
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