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Method for preparing oxidation pellet with municipal sludge and ferruginous waste

A technology of municipal sludge and oxidized pellets, which is applied in the direction of improving process efficiency, can solve the problems of difficult and harmless treatment and resource utilization of municipal sludge and iron-containing waste, and achieves easy promotion and use, good performance, The effect of increasing porosity

Inactive Publication Date: 2016-11-23
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to solve the problems in the prior art that urban sludge and iron-containing waste are difficult to harmless treatment and resource utilization.

Method used

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  • Method for preparing oxidation pellet with municipal sludge and ferruginous waste

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] like figure 1 As shown, a method for preparing oxidized pellets from municipal sludge and iron-containing waste is characterized in that it includes the following raw materials and their mass parts:

[0037] 5 parts of municipal sludge;

[0038] 92 parts of iron-containing waste;

[0039] 3 parts bentonite;

[0040] The water content of the municipal sludge is 35%.

[0041] The iron-containing waste includes blast furnace gas ash, converter sludge, sintering dedusting ash and sulfuric acid slag; the mass ratio of the blast furnace gas ash, converter sludge, sintering dedusting ash and sulfuric acid slag is: 16:18:32:34 .

[0042] Carry out the following steps with the above raw materials:

[0043] 1) Mix the weighed raw materials; the mixing process uses a mixing truck with a rotating speed of 15 r / min and a time of 8 minutes.

[0044] 2) Put the mixed raw materials obtained in step 1) into a disc pelletizer, add water, and prepare green pellets;

[0045] The dro...

Embodiment 2

[0053] like figure 1 As shown, a method for preparing oxidized pellets from municipal sludge and iron-containing waste is characterized in that it includes the following raw materials and their mass parts:

[0054] 7 parts of municipal sludge;

[0055] 91 parts of iron-containing waste;

[0056] 2 parts bentonite;

[0057] The water content of the municipal sludge is 35%.

[0058] The iron-containing waste includes blast furnace gas ash, converter sludge, sintering dedusting ash and sulfuric acid slag; the mass ratio of the blast furnace gas ash, converter sludge, sintering dedusting ash and sulfuric acid slag is: 19:17:33:31 .

[0059] Carry out the following steps with the above raw materials:

[0060] 1) Mix the weighed raw materials; the mixing process uses a mixing truck with a rotating speed of 20r / min and a time of 5min.

[0061] 2) Put the mixed raw materials obtained in step 1) into a disc pelletizer, add water to prepare green pellets; the prepared green pellet...

Embodiment 3

[0069] Such as figure 1 As shown, a method for preparing oxidized pellets from municipal sludge and iron-containing waste is characterized in that it includes the following raw materials and their mass parts:

[0070] 9 parts of municipal sludge;

[0071] 90 parts of iron-containing scrap;

[0072] 1 part bentonite;

[0073] The water content of the municipal sludge is 35%.

[0074] The iron-containing waste includes blast furnace gas ash, converter sludge, sintering dedusting ash and sulfuric acid slag; the mass ratio of the blast furnace gas ash, converter sludge, sintering dedusting ash and sulfuric acid slag is: 23:21:28:28 .

[0075] Carry out the following steps with the above raw materials:

[0076] 1) Mix the weighed raw materials; the mixing process uses a mixing truck with a rotating speed of 18r / min and a time of 6 minutes.

[0077] 2) Put the mixed raw materials obtained in step 1) into a disc pelletizer, add water, and prepare green pellets; the prepared gre...

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Abstract

The invention discloses a method for preparing an oxidation pellet with municipal sludge and ferruginous waste. The method is characterized by comprising the following raw materials in parts by mass 5-9 parts of municipal sludge, 90-92 parts of ferruginous waste and 1-3 parts of adhesive agent and comprising the following steps of: 1) mixing the weighed raw materials, 2) loading the mixed raw materials obtained in Step 1) into a disc granulator, and adding water to prepare a raw pellet, 3) drying the raw pellet prepared in Step 2) at 105 DEG C for 5h, and then preheating the raw pellet at 700-900 DEG C for 8-10min, and 4) roasting the preheated raw pellet obtained in Step 3) at 1200-1250 DEG C for 10-20min to form the oxidation pellet that is 15-20mm in particle size.

Description

technical field [0001] The invention relates to the technical field of ironmaking raw material preparation, in particular to a method for preparing oxidized pellets from urban sludge and iron-containing waste. Background technique [0002] With the continuous acceleration of my country's urbanization process, the environmental problems brought about by it have become increasingly prominent, among which the problem of urban sludge is particularly serious. The composition of urban sludge is relatively complex, containing refractory organic matter, pathogenic bacteria, parasites, heavy metals, and toxic and harmful substances such as dioxin, and accompanied by stench. [0003] If the sewage sludge is calculated with a water content of 80%, the total amount of sludge that can be produced in the country is about 30 million tons per year; and according to relevant estimates, until 2020, my country's annual sludge output will exceed 60 million tons. If it is not handled properly, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/243C22B1/02
CPCC22B1/02C22B1/2406C22B1/243Y02P10/20
Inventor 刘清才蒋历俊胡广郭富强赵齐王小青姚璐李琳孔明周强方诗惠
Owner CHONGQING UNIV
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