Carbide slag modification and method of making cement using modified carbide slag instead of natural gypsum

A technology of carbide slag and dry carbide slag is applied in the field of modification of carbide slag and replacement of natural gypsum to grind cement, which can solve the problems of low effective utilization rate, occupation of land resources, secondary pollution, etc. The effect of consumption, reducing pollution, saving resources and energy

Inactive Publication Date: 2007-04-18
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to statistics, more than 7 million tons of calcium carbide slag are discharged every year in the country. Due to the low effective utilization rate, a large amount of accumulation is accumulated year by year, which not only occupies valuable land resources, but also causes secondary pollution to air, surface water and groundwater.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] It is required to convert about 65% of the calcium oxide in the carbide slag to calcium sulfate.

[0015] The ratio of raw materials for preparing the modified carbide slag is: 100 kg of dry carbide slag is added with 84.5 kg of waste sulfuric acid with a weight concentration of 76%, and 15.5 kg of tap water.

[0016] The process flow for preparing modified carbide slag: carbide slag-→drying-→crushing-→measurement-→acidification-→aging-→drying-→modified carbide slag finished product.

[0017] Among them: the particle size of the crushed calcium carbide slag is less than 6mm. The content of sulfur trioxide in the prepared modified carbide slag is about 37%.

Embodiment 2

[0019] It is required to convert about 58% of the calcium oxide in the carbide slag to calcium sulfate.

[0020] The ratio of raw materials for preparing modified carbide slag is: 100kg of dry carbide slag is added with 75.3kg of waste sulfuric acid with a weight concentration of 76% and 24.7kg of tap water.

[0021] The process flow for preparing modified carbide slag is the same as in Example 1.

[0022] Among them: the particle size of the crushed calcium carbide slag is less than 6mm. The content of sulfur trioxide in the prepared modified carbide slag is about 33%.

Embodiment 3

[0024] It is required to convert about 72% of the calcium oxide in the carbide slag to calcium sulfate.

[0025] The ratio of raw materials for preparing modified carbide slag is: 93.5 kg of waste sulfuric acid with a weight concentration of 76% and 6.5 kg of tap water are added to 100 kg of dry carbide slag.

[0026] The process flow for preparing modified carbide slag is the same as in Example 1.

[0027] Among them: the particle size of the crushed calcium carbide slag is less than 6mm. The content of sulfur trioxide in the prepared modified carbide slag is about 41%.

[0028] The finished products of modified calcium carbide slag in the above three cases were sampled for full chemical analysis, and the analysis data are shown in Table 1:

[0029] loss

[0030] The following is an example of using the above-mentioned modified carbide slag 1 instead of natural gypsum to grind cement.

[0031] (1) Preparation of Portland cement

[0032] The raw material compos...

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Abstract

The present invention relates to a method for modifying carbide slag. The raw material composition for preparing modified carbide slag includes 100 kg of dried carbide slag, 66-118 kg of waste sulfuric acid whose percentage concentration is 60%-86% and 0-44 kg of running water. Its technological process includes the following steps: drying carbide slag, breaking, metering, acidifying, ageing and drying so as to obtain the invented modified carbide slag which can be used for making cement instead of natural gypsum.

Description

technical field [0001] The invention relates to modification of calcium carbide slag and a method for grinding cement with modified carbide slag instead of natural gypsum. Background technique [0002] Carbide slag is a solid waste discharged from the production of polyvinyl chloride in chemical plants. Its chemical composition is similar to that of slaked lime, the particles are fine and uniform, and the main component is Ca(OH) 2 . According to statistics, more than 7 million tons of calcium carbide slag are discharged every year in the country. Due to the low effective utilization rate, a large amount of accumulation is accumulated year by year, which not only occupies valuable land resources, but also causes secondary pollution to air, surface water and groundwater. How to effectively and comprehensively utilize carbide slag is very important to protect the environment, save land resources and achieve sustainable economic development. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B22/06
Inventor 邱树恒陆宇兰冯庆革崔学民张刚生
Owner GUANGXI UNIV
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