Method for preparing geopolymer by using chromium slag

A technology of geopolymers and chromium slag, which is applied in the field of preparing geopolymers from chromium slag, which can solve the problems of high energy consumption and high cost of recycling, and achieve the effect of increasing the added value of resources and facilitating production and deployment

Inactive Publication Date: 2021-11-09
中科镁基(北京)科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problems of large energy consumption and high cost in the recovery of useful elements in chromium slag existing in the prior art, the present invention provides a method for preparing geopolymers by using chromium slag, and the chromium slag is treated as a building material, The method of building material utilization realizes zero discharge and resource utilization of chromium slag, which improves the practical value of chromium slag

Method used

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  • Method for preparing geopolymer by using chromium slag
  • Method for preparing geopolymer by using chromium slag
  • Method for preparing geopolymer by using chromium slag

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0028] The present embodiment provides a kind of method utilizing chromium slag to prepare geopolymer, comprises the following steps:

[0029] (1) Preparation of alkali activator: take water glass with different modulus and dissolve it in a beaker, weigh sodium hydroxide (content 99%), pour sodium hydroxide into the water glass solution, and use a glass rod to continuously stir , until all the sodium hydroxide is dissolved in the water glass solution. After stirring, seal it with plastic wrap and wait until the solution cools down before using it. The modulus selected for the experiment of this embodiment is 1-1.8.

[0030] (2) Pretreatment of chromium slag: pulverize the water-quenched chromium slag, then pass the crushed chromium slag through a 100-mesh sieve, and re-grind the sieve through a pulverizer until all pass through a 100-mesh sieve.

[0031] (3) Preparation of geopolymers from chromium slag raw materials: Mix the pulverized chromium slag with a certain amount of...

Embodiment 2

[0038] The present embodiment provides a kind of method utilizing chromium slag to prepare geopolymer, comprises the following steps:

[0039] (1) Preparation of alkali activator: take water glass with different modulus and dissolve it in a beaker, weigh sodium hydroxide (content 99%), pour sodium hydroxide into the water glass solution, and use a glass rod to continuously stir , until all the sodium hydroxide is dissolved in the water glass solution. After stirring, seal it with plastic wrap and wait until the solution cools down before using it. The experiment of this embodiment selects the modulus as 1.4.

[0040] (2) Pretreatment of chromium slag: crush the water-quenched chromium slag, and then pass the crushed chromium slag through 100-mesh and 200-mesh sieves.

[0041] (3) Preparation of geopolymers from chromium slag raw materials: Mix the pulverized chromium slag with micropowder and stir evenly, then add alkali activator, stir well, pour into mortar mold and vibrat...

Embodiment 3

[0048] The present embodiment provides a kind of method utilizing chromium slag to prepare geopolymer, comprises the following steps:

[0049] (1) Preparation of alkali activator: take different amounts of water glass and dissolve it into a beaker, take by weighing sodium hydroxide (content 99%), pour sodium hydroxide into the water glass solution, use a glass rod to continuously stir, Until the sodium hydroxide is completely dissolved in the water glass solution. During this process, it should be noted that the sodium hydroxide dissolves in the water glass and releases a large amount of heat, which may cause a certain amount of water to evaporate, so after stirring, seal it with plastic wrap, and wait until the solution is cooled before use.

[0050](2) Pretreatment of chromium slag: pulverize the water-quenched chromium slag, then pass the crushed chromium slag through a 100-mesh sieve, and re-grind the sieve through a pulverizer until all pass through a 100-mesh sieve.

[...

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Abstract

The invention particularly relates to a method for preparing a geopolymer by using chromium slag, the method for preparing the geopolymer by using the chromium slag comprises the following steps: preparation of an alkali activator: adding sodium hydroxide into a water glass solution, stirring until the sodium hydroxide is completely dissolved into the water glass solution, sealing and cooling; pretreatment of the chromium slag: crushing the chromium slag and then sieving; and preparation of the geopolymer: uniformly mixing the crushed chromium slag with the micro powder, adding the alkali activator, uniformly stirring, pouring into a mold, carrying out vibration molding, maintaining, removing the mold, and maintaining at room temperature to obtain the geopolymer. According to the method for preparing the geopolymer by using the chromium slag, the chromium slag is subjected to building material treatment, the problem of consumption of the chromium slag is solved, the resource additional value of the chromium slag is improved, and zero emission and resource utilization of the chromium slag can be achieved through the building material utilization method.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of solid waste, in particular to a method for preparing geopolymers from chromium slag. Background technique [0002] Chromium slag is an industrial waste produced during the production of metallic chromium and chromium salts, which is extremely harmful to humans. More than 20 provinces and cities in China currently discharge chromium slag. In the absence of a reducing agent, an aqueous solution of sodium dichromate contains highly toxic dichromate radicals containing hexavalent chromium. Chromium slag is stacked in the open air, and after being soaked by rain and snow, the hexavalent chromium contained in it is dissolved and infiltrated into groundwater or into rivers and lakes, causing serious pollution to surface water, groundwater and soil. At this time, the content of hexavalent chromium in the water can be as high as tens of milligrams per liter, which is several times higher than ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B12/00C04B7/153
CPCC04B12/005C04B7/1535Y02P40/10
Inventor 张志远张羊
Owner 中科镁基(北京)科技有限公司
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