Method for preparation of concrete admixture from papermaking green mud alkali recovery bottom slag

A technology of concrete and admixture, applied in the field of building materials, can solve the problem of inability to solve a large number of chlorite alkali waste residues, etc., and achieve the effects of strong hydration activity, simple realization, good workability and strength

Inactive Publication Date: 2017-07-25
XIAN AEROSPACE SOURCE POWER ENG CO LTD
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Problems solved by technology

At the same time, a large amount of waste residue will be produced after alkali recovery. Although there are reports on the application of green mud in the preparation of cement bricks, the existing technology cannot solve the waste residue generated after the recovery of chlorite alkali.
There is no report on the application of the bottom slag recovered from papermaking chlorite alkali as a concrete admixture

Method used

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  • Method for preparation of concrete admixture from papermaking green mud alkali recovery bottom slag

Examples

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Effect test

Embodiment 1

[0021] like figure 1 As shown, this embodiment provides a method for preparing concrete admixture by using papermaking chlorite alkali to recover the bottom slag, and the recovered chlormine alkali can be used as the original lye of the desulfurization system of the coal-fired boiler. specific:

[0022] (1) Drying of papermaking green mud, using calciner flue gas as the heat source, the papermaking green mud is contact-dried to reduce the original moisture content to below 10%, and the flue gas is discharged up to the standard after dust removal and alkali washing. The particles collected by gas dust removal are mixed with green marl and fly ash as concrete admixtures;

[0023] (2) Calcination, at 800-850°C, calcining in a calcination furnace for 10-30min, completely incinerating to remove the organic matter in the green mud, and decomposing the salt in the green mud for papermaking into oxides and converting it into green mud ash. The drying and calcination of papermaking g...

Embodiment 2

[0029] This embodiment provides a method for preparing concrete admixtures by using papermaking chlorite alkali to recover bottom slag, specifically:

[0030] (1) 100 units of paper-making green mud with a moisture content of 40% is used as a heat source, and the rotary kiln drying furnace is used to dry to a moisture content of 10%. The quality of the dried green mud is 66.7 units of mass, and the flue gas is passed through a cyclone After the dust is removed, it will be discharged up to the standard after subsequent treatment, and the dust particles will be collected from the bottom of the cyclone separator for future use.

[0031] (2) 66.7 units of paper-making green mud with a moisture content of 10% is used as fuel by a calcination furnace at 815° C. for 20 minutes to be converted into 40 units of green mud, and the calcined flue gas is used in step (1) green mud Dry.

[0032] (3) Use a ball mill to grind 40 units of green putty to a size below 180 mesh.

[0033] (4) Us...

Embodiment 3

[0040] In this example, the concrete admixture prepared in Example 2 is used to prepare C40 concrete, and the test is carried out according to the method stipulated in the "Concrete Quality Control Standard" (GB50164-2011) to detect the slump and mechanical properties of the concrete. Mixture Performance Test Methods" (GB / T 50080) and "Concrete Strength Inspection and Evaluation Standards" (GB / T50107).

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Abstract

The invention discloses a method for preparation of a concrete admixture from papermaking green mud alkali recovery bottom slag, green mud ash powder is obtained by drying, calcining and ball milling of papermaking green mud, supernatant and bottom slag can be obtained by mixing, dissolving and standing of the green mud ash powder, and the bottom slag is filtered by pressing and mixed with fly ash to obtain the concrete admixture. On the one hand, papermaking green mud burying is avoided, on the other hand, a large amount of waste residue generated after green mud alkali recovery is effectively utilized; meanwhile, the supernatant of the green mud ash solution can be used in a coal fired boiler desulfurization system of a paper making plant.

Description

technical field [0001] The invention belongs to the technical field of building materials and relates to concrete admixtures, in particular to a method for preparing concrete admixtures by using papermaking chlorite alkali to recover bottom slag. Background technique [0002] Pulping and papermaking produces a large amount of green sludge in the causticizing process of alkali recovery. At present, 80% of the domestic industry is still in the traditional landfill method. Green mud landfill not only occupies a large amount of land, but also causes serious pollution to groundwater and the environment. The composition of green clay is complex, containing a large amount of sodium, calcium, magnesium, silicon, iron and free carbon and other substances. Because green clay contains a large amount of inorganic substances, it has potential as a building material. However, due to the presence of a large amount of sodium and potassium, green clay is highly alkaline and difficult to be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B18/08C04B18/04C04B20/04
CPCC04B20/04C04B40/0042C04B18/0427C04B18/08C04B18/0418Y02W30/91
Inventor 鲁涛仲伟聪池保华苟远波周楠韩延宇朱宝飞
Owner XIAN AEROSPACE SOURCE POWER ENG CO LTD
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