A method for resource utilization of sludge biochar

A technology of biochar and resource utilization, applied in the field of metallurgical sintering, can solve the problems that sludge biochar cannot be used on a large scale and the environmental risk of land use is high, so as to reduce the cost of raw materials and fuels in metallurgical sintering process, realize low-cost recycling, The effect of reducing fuel costs

Active Publication Date: 2020-07-31
INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for resource utilization of sludge biochar that overcomes the shortcomings of the existing sludge biochar that cannot be utilized on a large scale and has high environmental risks in land use

Method used

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  • A method for resource utilization of sludge biochar
  • A method for resource utilization of sludge biochar
  • A method for resource utilization of sludge biochar

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The existing sintering benchmark ingredients are shown in Table 1. Table 2 is the main chemical composition of sintered iron-containing raw materials, and the chemical composition of sludge biochar is shown in Table 3.

[0028] The composition table (mass percentage) of existing sintering reference batching of table 1

[0029]

[0030]

[0031] Table 2 Contents of main components of sintered iron-containing raw materials (mass percentage)

[0032] TF FeO SiO 2

CaO al 2 o 3

MgO Loss on Ignition (LOI) Concentrate 65.52 27.21 5.62 0.36 1.22 0.63 0.54 brazilian mine 63.52 0.32 4.53 0.04 1.03 0.08 0.67 south african mine 65.45 0.22 3.89 0.07 0.74 0.02 0.39 Limonite 57.34 0.38 6.88 0.08 2.17 0.05 9.87 Rolled Steel Scale 71.12 53.35 2.62 1.63 0.12 0.83 --

[0033] Table 3 Chemical composition table (mass percentage) of sludge biochar

[0034] composition SiO 2 ...

Embodiment 2

[0043] According to the scheme in the present invention, sludge biochar and rolled steel scale are mixed according to the weight percentage ratio of 80%: 20%, and disc granulation is used to prepare 0.5-3mm pellets; the pellets are mixed with a mass ratio of 5% The ratio was mixed into the existing sintered material involved in Example 1 to prepare a sintered mixture, and then sintered with a thickness of 650 mm. The sintering test results show that: compared with the sintering method without adding pellets and using a 550mm non-thick material layer, the sintering utilization coefficient increases by 6.1%, and the solid fuel consumption decreases by 1.3kg / T.

Embodiment 3

[0045] According to the scheme in the present invention, sludge biochar and rolled steel scale are mixed according to the weight percentage ratio of 70%: 30%, and disc granulation is used to prepare 0.5-3mm pellets; the pellets are mixed with a mass ratio of 3% The ratio is mixed into the mixture, and then the 700mm thick material layer is sintered for test. The results of the sintering test show that compared with the sintering method of 550mm non-thick material layer without adding pellets, the sintering utilization coefficient increases by 6.5%, and the solid fuel consumption decreases by 1.8kg / T.

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Abstract

The invention discloses a method for performing resource utilization of sludge biocarbon. The method comprises the following steps: uniformly mixing the sludge biocarbon, water and auxiliaries and performing granulation to obtain granulated materials; mixing the granulated materials with original sintering base ingredients to obtain a sintering mixed material; performing sintering on a conventional metallurgical sintering machine to obtain sintered ores; feeding the sintered ores as iron-making raw materials into a high blast smelting. According to the method disclosed by the invention, valuable components in the sludge biocarbon can be effectively utilized, the components and the performance of the sintered ores are adjusted, and the cost of the sintering raw materials is reduced; and 3 percent to 8 percent of carbon contained in the biocarbon can be used as supplementary energy sources for sintering, so that the cost of fuels is reduced. According to the method, a new path is provided for scale utilization of sludge pyrolysis terminal products, the sludge biocarbon is used as the raw material for high blast smelting, so that accumulated pollution of heavy metal which potentiallyexists in the land utilization process is completely avoided, and the method is particularly suitable for performing resource utilization of sludge pyrolysis which contains superstandard content of heavy metal. The method disclosed by the invention has the advantages of simpleness, practicability, less investment, low cost and environmental protection.

Description

technical field [0001] The invention relates to the field of metallurgical sintering, in particular to a method for resource utilization of sludge biochar. Background technique [0002] As the main raw material for blast furnace production, sinter plays an important role in blast furnace production, especially in the context of the rapid development of my country's iron and steel enterprises in recent years, the annual output of sinter is hundreds of millions of tons. Iron ore powder sintering is a method of agglomeration. Its principle is to mix fine-grained iron-containing raw materials with fuel and flux in a certain proportion, add water to moisten and mix to make sintering mixture, and then distribute it on the sintering machine. , draft, and use the fuel in the sintering material to burn to generate high temperature, and then a series of physical and chemical changes will occur to form some low-melting point substances, and soften and melt to produce a certain amount o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/16C22B1/24
CPCC22B1/16C22B1/2406Y02P10/20
Inventor 余广炜汪印
Owner INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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