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Method for preparing concrete with dry-process detoxified chromium slag as concrete mineral additive

A mineral admixture and concrete technology, applied in the field of building materials, can solve problems such as polluting the environment and occupying cultivated land, and achieve the effects of solving environmental problems, low cost and simple process

Inactive Publication Date: 2014-08-13
BEIJING TRIUMPH INT ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem that the stockpiling of detoxified chromium slag not only pollutes the environment but also occupies cultivated land, the purpose of the present invention is to provide a method for preparing concrete by using detoxified chromium slag directly as mineral admixture in concrete

Method used

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  • Method for preparing concrete with dry-process detoxified chromium slag as concrete mineral additive
  • Method for preparing concrete with dry-process detoxified chromium slag as concrete mineral additive
  • Method for preparing concrete with dry-process detoxified chromium slag as concrete mineral additive

Examples

Experimental program
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Effect test

Embodiment 1-12

[0025] Example 1-12, Preparation of cement mortar material and performance testing of dry method detoxification chromium slag partially replacing cement

[0026] Cement mortar is a kind of generalized concrete, which is fine aggregate concrete. This group of experiments uses cement mortar to determine the use and dosage of dry detoxification chromium slag.

[0027] The experiment includes the following specific steps:

[0028] 1) Grind the dry detoxification chromium residue until the specific surface area is 600m 2 / kg (embodiment 1-4, measured value is 606m 2 / kg), 450m 2 / kg (embodiment 5-8, measured value is 468m 2 / kg), 300m 2 / kg (embodiment 9-12, measured value is 289m 2 / kg). Here, the detoxified chromium slag fine powder is obtained by grinding, and the allowable value of the measured specific surface area is (expected value ± 20) m 2 / kg.

[0029] 2) use dry detoxification of 0%, 5%, 10%, 15%, 20% (by mass) accounting for the total amount of cementitious mat...

Embodiment 13-15

[0046] Example 13-15, Preparation of Concrete Material and Its Performance Testing Using Dry Process Detoxification Chromium Slag Partially Substituting Concrete Mineral Admixtures

[0047] In engineering concrete materials, concrete mineral admixtures such as slag powder and fly ash are usually used to improve the mechanical properties and durability of concrete. In this group of examples, the detoxified chromium slag is used to partially replace the common mineral admixture (taking fly ash as an example) to illustrate the application of the detoxified chromium slag in concrete materials.

[0048] Include the following steps:

[0049] 1) Grind dry detoxification chromium residue until the specific surface area is 468m 2 / kg (this example is represented by this data, 300-600m 2 / kg can be);

[0050] 2) Replace the mineral admixture fly ash in the concrete batching with dry method detoxification chromium slag, the dosage is cementitious material (the total amount of cement, ...

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Abstract

The invention discloses a method for preparing concrete with dry-process detoxified chromium slag as a concrete mineral additive. The method comprises the following steps: grinding the dry-process detoxified chromium slag until the specific surface area of the dry-process detoxified chromium slag is 300 to 600 m2 / kg + / - 20 m2 / kg; and then preparing concrete by using the ground dry-process detoxified chromium slag accounting for no more than 20% (by mass) of the total amount of a cementing material (including cement clinker and a concrete mineral additive containing chromium slag) in the concrete to replace cement clinker or the concrete mineral additive. Detection results show that a concrete material prepared by using the method has mechanical properties and endurance quality identical to or better than a concrete material prepared from a common mineral additive; and with the method, hexavalent chromium in the dry-process detoxified chromium slag can be effectively solidified, pollution of hexavalent chromium to soil, a water body and the like is avoided, so resourceful utilization of the dry-process detoxified chromium slag is realized and the method is of active significance to overcoming of the problem of stockpiling of chromium slag.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a method for preparing concrete by using dry-process detoxified chromium slag as a concrete mineral admixture (that is, a resource utilization method for dry-process detoxified chromium slag). Background technique [0002] Chromium slag is the waste slag discharged during the production of chemical products such as metal chromium and chromium salts. The hexavalent chromium Cr(Ⅵ) contained in chromium slag has strong oxidizing properties, which can cause corrosion and damage of organisms, and has great harm to the human body. If stored in open air for a long time, Cr(Ⅵ) in chromium slag will enter surface water or groundwater through rain, which will cause serious pollution to soil and water sources. my country's annual discharge of chromium slag is about 450,000 tons, and the accumulated amount has exceeded 4 million tons. A large amount of chromium slag pi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B7/14
CPCY02P40/10
Inventor 马明亮杨红彩李飞陆秉权张晓奇李平曹玉波沈文婷
Owner BEIJING TRIUMPH INT ENG
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