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Curing agent and method for reducing leaching toxicity of manganese element in cement

A technology of curing agent and element, applied in cement production, etc., can solve the problems of less research on cement leaching toxicity, achieve the effects of reducing leaching toxicity, promoting the calcination process, and increasing the liquid phase amount

Active Publication Date: 2021-06-04
GEZHOUBA SONGZI CEMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Existing studies on the leaching toxicity of solid waste mostly focus on adding cement as a curing agent into solid waste to reduce the leaching toxicity of the solid waste. There are few studies on the leaching toxicity of cement itself, and most of the research focuses on lead, Metal elements such as chromium and copper

Method used

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  • Curing agent and method for reducing leaching toxicity of manganese element in cement
  • Curing agent and method for reducing leaching toxicity of manganese element in cement
  • Curing agent and method for reducing leaching toxicity of manganese element in cement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] 1) Implementation plan batching scheme: converter slag 2.9%, silica stone slag 2.0%, sulfuric acid slag 1.7%, solid waste 9.8%, limestone 83.5%, curing agent I (desulfurization gypsum+NaF) 0.1%, all materials are mixed, in Calcined at 1400°C to obtain the required clinker. The mass ratio of desulfurized gypsum and NaF in curing agent Ⅰ is 96:4, in which desulfurized gypsum controls its SO 3 The content is 43%;

[0044] 2) The prepared clinker is mixed with mixed slag (burned coal gangue: volcanic ash 3:1), limestone powder, desulfurized gypsum and curing agent II (zeolite + metakaolin) to prepare cement. The mass fraction of zeolite in curing agent II is 66%, and the mass fraction of metakaolin is 34%.

[0045] Batching scheme is as follows table 4:

[0046] Table 4

[0047]

[0048] The test results are shown in Table 5 below.

[0049] table 5

[0050]

Embodiment 2

[0060] 1) Implementation plan batching scheme: converter slag 2.9%, silica stone slag 2.0%, sulfuric acid slag 1.7%, solid waste 9.8%, limestone 83.1%, curing agent I (desulfurization gypsum+NaF) 0.5%, all materials are mixed, in Calcined at 1400°C to obtain the required clinker. The mass ratio of desulfurized gypsum and NaF in curing agent Ⅰ is 96:4, in which desulfurized gypsum controls its SO 3 The content is 43%.

[0061] 2) The prepared clinker is mixed with mixed slag (burned coal gangue: volcanic ash 3:1), limestone powder, desulfurized gypsum and curing agent II (zeolite + metakaolin) to prepare cement. The mass fraction of zeolite in curing agent II is 66%, and the mass fraction of metakaolin is 34%.

[0062] Batching scheme is as follows table 7:

[0063] Table 7

[0064]

[0065]

[0066] The test results are shown in Table 8 below.

[0067] Table 8

[0068]

[0069] It can be seen from Table 8 above that:

[0070] 1) Compared with the 0.1% desulfuri...

Embodiment 3

[0074] 1) Implementation plan batching scheme: converter slag 2.9%, silica stone slag 2.0%, sulfuric acid slag 1.7%, solid waste 9.8%, limestone 82.6%, curing agent I (desulfurization gypsum+NaF) 1.0%, mix all materials, Calcined at 1400°C to obtain the required clinker. The mass ratio of desulfurized gypsum and NaF in curing agent Ⅰ is 96:4, in which desulfurized gypsum controls its SO 3 The content is 43%.

[0075] 2) The prepared clinker is mixed with mixed slag (burned coal gangue: volcanic ash 3:1), limestone powder, desulfurized gypsum and curing agent II (zeolite + metakaolin) to prepare cement. The mass fraction of zeolite in curing agent II is 66%, and the mass fraction of metakaolin is 34%.

[0076] Batching scheme is as follows table 9:

[0077] Table 9

[0078]

[0079] The test results are shown in Table 10.

[0080] Table 10

[0081]

[0082] It can be seen from the above table:

[0083] 1) Compared with 0.1% and 0.5% desulfurized gypsum+NaF in Examp...

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Abstract

The invention relates to a curing agent and a method for reducing leaching toxicity of a manganese element in cement. The method is characterized in that the leaching toxicity of the manganese element in the cement is reduced by adding the curing agent in clinker calcination and cement grinding processes; the curing agent I added in the clinker calcining process is mainly composed of flue gas desulfurization gypsum and NaF, the mass ratio of the flue gas desulfurization gypsum to the NaF is (96-98): (2-4), and the SO3 content of the flue gas desulfurization gypsum is controlled to be 40%-45%; the curing agent II added in the cement grinding process is mainly composed of zeolite and metakaolin, the zeolite accounts for 65%-67% by mass, and the metakaolin accounts for 33%-35% by mass. According to the invention, effective utilization of solid wastes with relatively high heavy metal content is realized, the leaching toxicity of the heavy metal manganese element in the cement product is reduced, and the reduction amplitude can reach more than 70% through comprehensive consideration.

Description

technical field [0001] The invention relates to the field of cement production, in particular to a curing agent for reducing the leaching toxicity of manganese in cement and a method thereof. Background technique [0002] With the continuous improvement of my country's economy and living standards, more and more household garbage, solid waste and even some hazardous waste are produced. The cement industry has its own advantages in dealing with these solid wastes, but the problems that follow It is the introduction of these wastes, and some harmful elements in them will cause certain harm to the human body under certain conditions. [0003] Manganese is a heavy metal element with a relatively high content in solid waste used in cement production. Excessive exposure to manganese in a short period of time can cause manganese poisoning, tearing, photophobia, and even pulmonary edema in severe cases. Exposure to manganese may cause symptoms such as bronchitis, loss of sense of sm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/24C04B7/42C04B7/52
CPCC04B7/24C04B7/421C04B7/52Y02P40/10
Inventor 童昊杨莉荣陈杉邢婉婉詹妮向丛阳
Owner GEZHOUBA SONGZI CEMENT
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