Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Comprehensive recycling method of coal-series solid waste

A technology of solid waste and coal series, applied in the direction of chemical instruments and methods, applications, aluminum compounds, etc., can solve the problems of high recycling cost, high acid consumption of acid leaching, high equipment requirements, etc., achieve high recovery rate and reduce direct processing Costs, the effect of reducing procurement

Pending Publication Date: 2021-06-11
眉山顺应循环再生资源有限公司
View PDF8 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Aiming at the technical problems existing in the existing methods of extracting alumina from coal-based solid wastes, such as the long process flow of the alkaline leaching method and high recovery costs; the high acid consumption of the acid leaching method, the high impurity content of the leachate, the high cost of impurity removal, and high equipment requirements, etc., The invention provides a method for comprehensive recovery and utilization of coal-based solid waste. The method has a high extraction rate of aluminum oxide and can effectively separate aluminum and iron in the pickling solution; at the same time, the aluminum nitrate and magnesium nitrate solutions obtained in the process are passed through Evaporation and concentration to obtain crystals for subsequent decomposition and regeneration to obtain acid (nitric acid) and alkali (alumina, magnesium oxide), realizing the acid-base dual-medium regeneration cycle; at the same time, elements aluminum, iron, calcium, magnesium, and gallium in coal-based solid waste and other metals have been better comprehensively utilized

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Comprehensive recycling method of coal-series solid waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] refer to figure 1 The schematic diagram of the process flow shown:

[0046] (1) Fly ash is crushed and finely ground to obtain ore powder, and the ore powder is magnetically separated into magnetic ore and non-magnetic ore, and the non-magnetic ore is decarbonized by flotation separation to obtain the decarbonized material; The mass fraction of the chemical element composition of the material after carbon removal includes: 3.8% Fe; 20.3% Al; 27% Si; 2.12% Ca; 0.08% Mg;

[0047] (2) Carry out the nitric acid pressurized two-stage reverse leaching reaction of the material after the carbon removal, the first stage leaching and filtering to obtain the first filtrate and the first filter residue, and the second stage leaching of the first filter residue, and filtering to obtain the second Filtrate and second filter residue, the second filtrate is used for reverse first-stage leaching, and the second filter residue is processed into silicon-containing products; the first-sta...

Embodiment 2

[0056] (1) Crush and finely grind the mixture of fly ash and coal gangue to obtain ore powder, magnetically separate the ore powder into magnetic ore and non-magnetic ore, and decarbonize the non-magnetic ore by flotation separation to obtain decarbonized ore After material; the mass fraction of the chemical element composition of the material after carbon removal includes: Fe 4.0%; Al 18.7%; Si 35%; Ca 2.18%; Mg 0.03%; Ga 135g / t.

[0057] (2) Carry out the nitric acid pressurized two-stage reverse leaching reaction of the material after the carbon removal, the first stage leaching and filtering to obtain the first filtrate and the first filter residue, and the second stage leaching of the first filter residue, and filtering to obtain the second The filtrate and the second filter residue, the second filtrate is used for reverse first-stage leaching, and the second filter residue is processed into silicon-containing products; wherein, the first-stage leaching conditions include:...

Embodiment 3

[0068] (1) Crush and finely grind coal gangue to obtain ore powder, magnetically separate the ore powder into magnetic ore and non-magnetic ore, and decarbonize the non-magnetic ore by flotation separation to obtain the decarbonized material; The mass fraction of the chemical element composition of the final material includes: Fe 2.7%; Al 22.9%; Si 39%; Ca 2.46%; Mg 0.09%; Ga 235g / t.

[0069] (2) Carry out the nitric acid pressurized two-stage reverse leaching reaction of the material after the carbon removal, the first stage leaching and filtering to obtain the first filtrate and the first filter residue, and the second stage leaching of the first filter residue, and filtering to obtain the second The filtrate and the second filter residue, the second filtrate is used for reverse first-stage leaching, and the second filter residue is processed into silicon-containing products; wherein, the first-stage leaching conditions include: the solid-liquid ratio of the material to the s...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a comprehensive recycling method of coal-series solid waste, and belongs to the crossing field of metallurgy and chemical industry. The method comprises the following steps: firstly, crushing and finely grinding coal-series solid wastes to obtain mineral powder, and carrying out magnetic separation and flotation on the mineral powder to obtain a carbon-removed material; and carrying out nitric acid pressurization two-stage reverse leaching reaction on the decarbonized material, and then sequentially recovering elements such as silicon, gallium, aluminum, magnesium and the like. According to the process method, the dissolution rate of extracted aluminum oxide is high, and aluminum and iron in the pickle liquor can be effectively separated; wherein aluminum nitrate and magnesium nitrate solutions obtained in the technological process are evaporated and concentrated to obtain crystals for subsequent decomposition and regeneration to obtain acid and alkali, so that acid-alkali double-medium regeneration cycle is realized; and meanwhile, elements such as aluminum, iron, calcium, magnesium and gallium in the coal-series solid waste are comprehensively utilized. The method has the advantages of low acid consumption, low impurity content in the leachate, low impurity removal cost, comprehensive recycling of each element, low equipment requirement, simple process and the like.

Description

technical field [0001] The invention belongs to the intersecting field of metallurgy and chemical industry, and in particular relates to a comprehensive recycling method for leaching fly ash or coal gangue under pressure with nitric acid. Background technique [0002] Coal-based solid waste comes from the mining, processing and utilization of coal. Among them, coal gangue and fly ash are the largest industrial solid wastes produced by thermal power plants, and their large-scale stockpiles have brought serious environmental pollution. [0003] At present, the utilization of coal gangue and fly ash is mainly based on construction engineering and building materials, which is single and the utilization level is low. Among them, extracting alumina from coal gangue or fly ash as bauxite resources is a method with a high utilization rate, which is of great significance for improving the utilization level of this type of coal-based solid waste. [0004] The methods for extracting ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C01F7/66C01F7/30C01F5/38C01F5/06C22B7/00C25C1/22C22B21/00C22B26/22C22B26/20C22B3/06
CPCC01F7/66C01F7/308C01F5/38C01F5/06C05C5/04C05C5/00C22B7/007C25C1/22C22B21/0007C22B21/0023C22B26/22C22B26/20Y02P10/20
Inventor 赵林但勇赵澎高波王成彦马保中陈永强邓婉琴赵顶
Owner 眉山顺应循环再生资源有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com