Full recycling method of high-aluminum coal gangue

Abstract

The invention relates to a full recycling method of high-aluminum coal gangue. The method comprises the following steps: crushing high-aluminum coal gangue; adding a strong alkaline solution into the crushed high-alumina coal gangue powder, reacting at a temperature of 120-150 DEG C, diluting with a large amount of water, and filtering to obtain a liquid B and a solid C; adjusting the pH value of the liquid B by using dilute sulfuric acid, and then filtering to obtain a solid D and a liquid E; drying and dehydrating the solid D to obtain a coarse aluminum oxide product rich in gallium, indium, thallium and germanium; adding SiO2 seed crystal into the liquid E, crystallizing under heating and stirring conditions, and filtering, drying and calcining the precipitate to obtain a crude white carbon black product; and adjusting the pH value of the solid C to be neutral by using dilute sulfuric acid, and dehydrating and drying to obtain a raw material for producing the road foundation stone. The process method provided by the invention has the advantages of simple steps, low cost, high added value, full recovery, easiness in industrial expansion and remarkable economic benefit.

Description

technical field [0001] The invention belongs to the technical field of resource treatment of solid waste, in particular a method for full recovery and utilization of high-alumina coal gangue. Background technique [0002] my country is a country rich in coal resources, and it is also the country with the largest coal mining and consumption in the world. In 2016, coal production accounted for 46.1% of the world's total coal production. Coal gangue is solid waste discharged during the mining and cleaning of coal resources. By the end of 2018, my country had accumulated 4.5 billion tons of coal gangue, occupying about 15,000 square kilometers of land. my country's research on the utilization of coal gangue started relatively late, and its industrial applications are mainly concentrated in the fields of mine backfill, road paving, power generation and building materials. Although the amount of coal gangue used in these fields is large, the added value of the products is not hig...

AI Technical Summary

Problems solved by technology

[0005] The technical purpose of the present invention is to provide a treatment process for high-alumina coal gangue with simple process flow, low cost of raw materials used in processing, various types of products, high added value, sufficient resource utilization, and full recovery and utilization of materials. Solve the technical problems of large coal gangue storage, low utilization rate, and poor economic benefits