Method for preparing solar heat storage ceramic from ferrotitanium slag

Abstract

The invention discloses a method for preparing solar heat storage ceramic from ferrotitanium slag. The solar heat storage ceramic is prepared from the following raw materials and modifiers in percentage by mass: 70-80wt% of ferrotitanium slag, 5-10wt% of kaolin, 4-8wt% of talc, 4-8wt% of potassium feldspar, 1-4wt% of albite and 4-8wt% of fly ash. All the raw materials are subjected to raw materialtreatment, proportioning and mixing, granulation and aging, semi-dry pressing molding, drying and sintering to obtain the solar heat storage ceramic. The solar heat storage ceramic produced by the invention is low in cost and high in heat storage density, and the volume density is as high as 2.97-3.08 g.cm < -3 >; the utilization rate of the ferrotitanium slag is as high as 70-80%, the solid waste is greatly digested, the application field of the ferrotitanium slag is widened, and the product has great environmental protection significance and economic value.

Description

technical field [0001] The invention relates to a method for preparing solar energy heat storage ceramics by utilizing ferro-titanium slag, which is mainly used in the fields of solar thermal power generation or solar heating, and belongs to the field of new energy. Background technique [0002] Solar thermal power generation is a power generation method that converts solar energy into electrical energy on a large scale. However, due to the change of seasons and the alternation of day and night, the light is not continuous, which is not conducive to stable power generation. The heat storage technology is the key to solve this problem, that is, the solar energy is stored in the heat storage material in the form of heat energy, and then released to generate heat when the light is insufficient to ensure stable and continuous power generation. Therefore, heat storage materials need to have the characteristics of high temperature resistance, high density, and low cost. Ceramics a...

AI Technical Summary

Problems solved by technology

[0003] Ferro-titanium slag (also known as calcium aluminate titanate) is the waste slag produced by smelting ferro-titanium alloy by the aluminothermic reduction method. For every 1 ton of ferro-titanium alloy produced, 1.0-1.5 tons of ferro-titanium slag is discharged at the same time. A large amount of ferro-titanium slag has caused environmental pollution and waste of resources. , urgently need to be developed and utilized

Chinese invention patent "Silicon carbide combined with calcium aluminate titanate composite refractory material and its preparation method" (CN201711231508.2) prepared a composite ceramic refractory material by using ferro-titanium slag, and the utilization rate of ferro-titanium slag is 50-55wt %; "A kind of calcium aluminate-alumina modified refractory material and its preparation method and application" (CN104609872B) prepared a kind of modified refractory material with ferro-titanium slag and high-alumina bauxite as raw materials, ferro-titanium slag The utilization rate is 25-40wt%. These inventions have successfully used ferro-titanium slag to prepare refractory materials, but the utilization rate of ferro-titanium slag needs to be improved, and it has not been applied to the preparation of heat storage materials.