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

Magnesium-containing raw material recycling treatment method

A processing method and a resource-recycling technology, which are applied in the field of resource recovery of magnesium in ores and smelting waste residues, and can solve the problems of heavy metal discharge, unrecoverable magnesium, and waste.

Active Publication Date: 2020-08-18
北京中金瑞丰环保科技有限公司
View PDF9 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are two problems in this method: (1) the rate of recovery of nonferrous metals is low, and the quality of nonferrous metal products obtained is also low, and energy consumption is high, secondary pollution is serious, and cost is very high
(2) In this method, calcium, magnesium, and silicon elements are converted into kiln slag, resulting in a large volume of kiln slag after the raw materials containing magnesium and calcium slag are processed in a rotary kiln, and the magnesium element is still unable to be recovered, resulting in waste
In short, for magnesium-calcium slag containing ferrous metals, due to its complex composition and ferrous metals, most of them are hazardous wastes. They are generally treated in a rotary kiln to volatilize non-ferrous metals, and the remaining calcium and magnesium elements are solidified into ordinary industrial waste.
The treatment process of the rotary kiln consumes a large amount of energy such as coal and natural gas, and also emits heavy metals and sulfur dioxide. Wasted, resource recycling rate is very low

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
  • Magnesium-containing raw material recycling treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0095] (1) Add 1kg of monoethanolamine, 0.25kg of threonine, and 0.2kg of phenylalanine to a 10L reaction kettle, set the volume to about 8.5L, add 1kg of dolomite (containing 12.7% of magnesium and 21.8% of calcium), and heat to 60°C, use sulfuric acid to adjust the pH to less than 4.0, react for 2 hours, filter, and wash with 1L of pure water to obtain 9L of filtrate and gypsum residue;

[0096] (2) transfer the obtained filtrate of step (1) into another reaction kettle, use sodium hydroxide water to adjust the pH value between 9.0-9.1, add 0.5kg of sodium carbonate, and filter to obtain calcium carbonate precipitation and filtrate;

[0097] (3) step (2) gained filtrate is transferred in another reactor, adds sodium carbonate 1.5kg, uses sodium hydroxide to maintain pH value between 9.7-9.9 during, reacts 5h, filters, obtains filtrate and basic magnesium carbonate precipitation;

[0098] (4) step (1) gained gypsum slag is transferred in another 15L reactor, adds 1kg magnesi...

Embodiment 2

[0102] (1) Mix 100g of magnesium smelting waste slag (4.5% magnesium and 50.1% calcium) with 100g ammonium sulfate solid, put it into a tube furnace, use argon to blow, and use two-stage 200ml water to absorb the tail gas. Pretreatment at ℃ for 10 hours to obtain 170g of pretreated magnesium smelting slag and 200ml of ammonia water (ammonia content 11.5%);

[0103] (2) Prepare 1L of 0.1mol / L magnesium sulfate and 0.5mol / L ammonium sulfate solution, add the pretreated magnesium smelting slag obtained in step (1) into the solution, heat to 100°C, react for 0.5h, and filter to obtain 0.95L filtrate and gypsum residue;

[0104] (3) Transfer the filtrate obtained in step (2) into another beaker, add sodium hydroxide to adjust the pH value to 11.1-11.2, maintain the reaction temperature at 95°C, and filter for 2 hours to obtain magnesium hydroxide precipitate and sulfate filtrate .

[0105] (4) The magnesium hydroxide precipitate obtained in step (3) is transferred to a beaker, 10...

Embodiment 3

[0109] (1) Add 55.6g of ammonium sulfate and 20g of magnesium sulfate to a 1L beaker, set the volume to 800ml, add 400g of dirty acid neutralization slag (containing 10% zinc, 5.5% magnesium, and 10% calcium), start stirring, and heat to 120 ℃, react for 2 hours, control the reaction pressure to 0.1Mpa, and filter to obtain 700ml of filtrate and gypsum slag;

[0110] (2) Add 10g of zinc powder to the filtrate gained in step (1), react for 5h, and filter to obtain purified residue and filtrate;

[0111] (3) Add the filtrate obtained in step (2) into another beaker, heat and evaporate to 400ml, cool to 0°C, and filter to obtain ammonium zinc sulfate solid and filtrate;

[0112] (4) Transfer the zinc ammonium sulfate solid obtained in step (3) into another beaker, add 500ml of water, use ammonia water to adjust the pH value between 8.0-8.2, pass through carbon dioxide at 100ml / min for 2 hours, filter, and obtain the basic formula Zinc carbonate products;

[0113] (5) The filtra...

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 relates to a magnesium-containing raw material recycling treatment method. The magnesium-containing raw material recycling treatment method comprises the steps that S1, magnesium reaction liquid containing sulfate and a magnesium cosolvent are mixed with magnesium-containing raw materials to perform reaction, the reaction system PH value is controlled to be less than 9.0, and after the reaction is finished, solid-liquid separation is performed to obtain a magnesium-containing solution A1 and calcium-containing residue B1; S2, the magnesium-containing solution A1 is reacted with aprecipitant, the reaction system PH value is controlled to be 5.5-12.0, and after the reaction is finished, the solid-liquid separation is performed to obtain a magnesium sediment solution A2 and magnesium-containing sediment B2; S3, calcium reaction liquid containing a calcium solvent, a calcium cosolvent and the sulfate is mixed with the calcium-containing residue B1 to perform the reaction, the reaction system PH value is controlled to be 5.5-12.0, and after the reaction is finished, the solid-liquid separation is performed to obtain a calcium-containing solution A3 and tail residue B3; and S4, the PH value of the calcium-containing solution A3 is adjusted to be 4.0-9.5, calcium sulfate is made to precipitate from the calcium-containing solution A3, and the solid-liquid separation is performed to obtain a calcium sediment solution A4 and calcium-containing sediment B4 containing the calcium sulfate. By means of the magnesium-containing raw material recycling treatment method, underthe condition of not consuming additional raw materials, magnesium, calcium and impurities in low-grade magnesium-containing raw materials are separated, corresponding calcium and magnesium productsare obtained, the magnesium resource recycling cost is reduced, and environmental pollution is reduced.

Description

technical field [0001] The invention relates to a magnesium extraction technology, in particular to a process method for recycling magnesium elements in ores with low magnesium content and smelting waste residues. Background technique [0002] With the increasing demands of society on environmental protection and sustainable development, people pay more and more attention to resource recovery and recycling. Through the recycling of resources, the discharge of three wastes can be reduced, and a green, environmentally friendly and sustainable economic development model can be realized. Renewable treatment is the use of physical, chemical and biological methods to purify energy waste products, reduce pollution, and at the same time recycle and regenerate them to realize the recycling of resources. [0003] Magnesium mainly comes from magnesite and dolomite minerals. After separation, purification, smelting and other processes, basic magnesium carbonate, magnesium oxide, magnes...

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): C22B26/22C22B7/00C22B3/44C22B26/20C22B3/46
CPCC22B26/22C22B7/006C22B3/44C22B26/20C22B3/46Y02P10/20
Inventor 张超刘军飞任佳楠武占月陈建民刘向东刘广辉孙建明王占
Owner 北京中金瑞丰环保科技有限公司
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