Device and method for preparing micro-powder calcium carbonate by utilizing carbide slag

Abstract

The invention discloses a device and a method for preparing micro-powder calcium carbonate by utilizing carbide slag. The device comprises a refining unit, a carbonization unit, a thickening and filter pressing unit and a drying unit, wherein the refining unit comprises a strong magnetic separator, a mixing and stirring tank, a first hydrocyclone, a flotation stirring tank and a flotation machine,the carbonization unit comprises at least two groups of carbonization tanks, the thickening and filter pressing unit comprises a thickener, a second hydrocyclone and a filter press, and the drying unit comprises a drying beater and a product collector. The method comprises the following steps of: removing iron compounds in raw materials by using the strong magnetic separator; preparing carbide slag slurry by using the mixing and stirring tank; removing impurities from the slurry by using the first hydrocyclone; adjusting the PH value of the slurry in the flotation stirring tank; desiliconizing and decarbonizing the slurry in the flotation machine; preparing calcium carbonate slurry in the carbonization tanks; increasing the concentration of the calcium carbonate slurry in the thickener; further thickening the slurry by using the second hydrocyclone; dehydrating the slurry by the filter press to prepare a calcium carbonate filter cake; and drying and smashing the calcium carbonate filter cake to form micro-powder calcium carbonate.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a device and a method for preparing micropowder calcium carbonate by utilizing calcium carbide slag. Background technique [0002] According to statistics, my country's existing calcium carbide production capacity is about 26 million tons, and at the same time, more than 35 million tons of calcium carbide slag are produced every year, and the main mineral component in calcium carbide slag is Ca(OH) 2 , its proportion in carbide slag reaches 70% to 85%. At present, only a small part of carbide slag is used to manufacture low-value-added cement, and most of the remaining carbide slag has not been recycled. This part of carbide slag will not only occupy a large amount of land, but also cause The hydrolysis of lye and residual calcium carbide will cause pollution to the ecological environment, groundwater and soil. Therefore, it is very necessary to solve the ...

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Problems solved by technology

But, all there is problem in the method in above-mentioned two patent applications

First, there is ammonia water in the intermediate products, and ammonia water is a chemical dangerous product, and its storage conditions and use requirements are relatively high; Residual carbon is the main factor affecting the quality and whiteness of micropowdered calcium carbonate; third, there are shortcomings such as long process flow, complicated process, high impurity content in products, and poor product quality.

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