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Method for preparing cement clinker by using chrome slag as mineralization agent

A technology for cement clinker and mineralizer, applied in the field of building materials, can solve the problems of high processing cost of chromium slag, high processing cost, secondary pollution, etc., and achieve the effects of improved scorchability, increased output and stable primer.

Inactive Publication Date: 2004-02-25
SICHUAN YINHE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Either the cost of chromium slag treatment is high, and the cost of chromium slag treatment per ton is as high as more than 600 yuan; or the second pollution occurs after the chromium slag is processed, and the concentration of hexavalent chromium far exceeds 8ppm
These methods are difficult to generalize

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] a. Grind and mix 100 grams of limestone, 21.5 grams of clay, 3.3 grams of iron powder, 14.9 grams of anthracite, and 2.1 grams of mineralizer chromium slag.

[0027] b. Add 15 grams of water to the black raw material, stir it into a ball, put it into a 500ml white jade crucible, cover it, and then place it in a 1400°C muffle furnace for calcination and keep it for 30 minutes. Take the clinker out of the oven and let it cool.

[0028] c. After the clinker is broken by the clinker crusher, add 2.5 grams of gypsum, 2 grams of water residue, and 0.05 grams of ferrous sulfate, mix well and grind to obtain the finished product.

[0029] d. The physical and chemical test results of the finished product: the specific surface area is 305m2 / Kg, the stability is qualified, the initial setting time is 90min, the final setting time is 155min, the flexural strength is 6.2MPa / 3d, 8.2MPa / 28d, and the compressive strength is 36MPa / 3d, 58.6MPa / 28d, water-soluble hexavalent chromium 2.0...

Embodiment 2

[0030] Embodiment 2: repeat the operation steps of embodiment 1, difference is:

[0031] a, mineralizer chromium slag 2.8 grams.

[0032] b. The temperature of the muffle furnace is 1350°C, and the time is 35 minutes.

[0033] c, 0.06 gram of sodium sulfite.

[0034] d. The physical and chemical test results of the finished product: the specific surface area is 306m2 / Kg, the stability is qualified, the initial setting time is 85min, the final setting time is 150min, the flexural strength is 6.6MPa / 3d, 8.6MPa / 28d, and the compressive strength is 38MPa / 3d, 61MPa / 28d , water-soluble hexavalent chromium 2.5ppm.

Embodiment 3

[0035] Embodiment 3: repeat the operation steps of embodiment 1, difference is:

[0036] a, mineralizer chromium slag 4.9 grams.

[0037] b. The temperature of the muffle furnace is 1400°C, and the time is 40 minutes.

[0038] c, 0.07 gram of sodium thiosulfate.

[0039] d. The physical and chemical test results of the finished product: the specific surface area is 300m2 / Kg, the stability is qualified, the initial setting time is 70min, the final setting time is 150min, the flexural strength is 6.4MPa / 3d, 8.4MPa / 28d, and the compressive strength is 37.5MPa / 3d, 60.3MPa / 28d, water-soluble hexavalent chromium 2.5ppm.

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Abstract

The method for preparing cement clinker by using chromium slag as mineralizer is mainly in the cement raw material the mineralizer chromium slag can be added, and the high-temp. calcination process is adopted to reduce hexavalent chromium into trivalent chromium, at the same time a catalytic stabilizer can be added in the clinker so as to obtain the invented cement clinker.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a method for producing cement clinker by using chromium-containing waste residue from a chromium salt factory as a cement mineralizer. Background technique [0002] At present, domestic chromium salt factories generally use calcium-containing alkaline oxidation roasting of chromite, which inevitably encounters a headache problem, which is how to reasonably deal with a large amount of chromium-containing waste residue generated in production. In the past, units such as Jinan Yuxing Chemical General Plant in Shandong Province used chromium slag to make iron (Wang Zhijing, Hu Zhugang, Comprehensive treatment of chromium slag and its application in ironmaking solvent, chromium salt industry, national chromium salt cooperation group, 2000, No. Phase 1), chrome slag instead of part of limestone to make cement (patent name: method for producing cement clinker with chromium ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/42C04B7/43C04B22/14
CPCC04B7/421C04B40/0039Y02P40/10C04B7/153C04B7/43C04B22/14C04B22/149C04B28/02
Inventor 李光荣蒋清平青兴全王亭刚赵云凯张松柏叶明光
Owner SICHUAN YINHE CHEM
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