Application of detoxic chromium dregs as cement admixture

A technology of cement clinker and cement, applied in the direction of cement production, etc., to achieve the effects of stable stability, good color and high strength value increase rate

Active Publication Date: 2006-06-28
SICHUAN YINHE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Embodiment 1

[0024] a. Add 3kg of detoxified chromium slag, 1.3kg of natural dihydrate gypsum, and 95.7kg of cement clinker into a cement mill to grind finely to obtain finished cement.

[0025] b. The physical and chemical results of the finished product: the stability is qualified, the initial setting time is 147min, the final setting time is 198min, the flexural strength is 5.8MPa / 3d, 8.6Mpa / 28d, the compressive strength is 27.6Mpa / 3d, 53.5Mpa / 28d, water-soluble hexavalent Chromium is zero.

Embodiment 2

[0027] a. Add 5kg of detoxified chromium slag, 1.3kg of natural dihydrate gypsum, and 93.7kg of cement clinker into a cement mill to grind finely to obtain finished cement.

[0028] b. The physical and chemical results of the finished product: the stability is qualified, the initial setting time is 161min, the final setting time is 205min, the flexural strength is 6.1MPa / 3d, 8.5Mpa / 28d, the compressive strength is 28.4Mpa / 3d, 52.5Mpa / 28d, water-soluble hexavalent Chromium is zero.

Embodiment 3

[0030] a. Add 9kg of detoxified chromium slag and 91kg of cement clinker into a cement mill and grind to obtain finished cement.

[0031] b. The physical and chemical results of the finished product: the stability is qualified, the initial setting time is 175min, the final setting time is 231min, the flexural strength is 6.1MPa / 3d, 8.6Mpa / 28d, the compressive strength is 29.0Mpa / 3d, 50.6Mpa / 28d, water-soluble hexavalent Chromium is zero.

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Abstract

An application of detoxicated Cr slags in preparing early-strenthening low-alkali cement and its products is disclosed. Said cement is prepared through proportionally mixing said detoxicated Cr slags with clinker and natural bihydrated gypsum. Its advantages are high quality of cement and no secondary pollution.

Description

Technical field: [0001] The invention relates to the use of detoxified chromium slag as admixture material to produce cement. The invention also relates to a method for producing cement by using detoxified chromium slag as admixture material and its products. Background technique: [0002] Most of today's cement production uses natural dihydrate gypsum as a retarder to relieve the rapid setting of cement, increase the strength of cement (especially the early strength), reduce the drying shrinkage of cement products in the air by 30-50%, and improve the cement's durability. Freeze resistance, chemical resistance and stability. [0003] Chromium slag is a chemical solid waste produced during the production of chromium salts. At present, the actual annual output of chromium salts has exceeded 160,000 tons. According to the calculation of slag discharge coefficient and chromium slag output, the annual discharge of chromium slag in my country is 350,000-420,000 tons, and 2.5 mi...

Claims

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Application Information

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IPC IPC(8): C04B22/08C04B7/14C04B7/36C04B103/22
CPCY02P40/10
Inventor 李先荣张国庆马顺友王亭刚胡义华
Owner SICHUAN YINHE CHEM
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