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

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. ...