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A kind of resource processing method of magnesium-containing raw material

A processing method and a resource-based technology, applied in the direction of improving process efficiency, can solve the problems of high cost, lack of calcium and magnesium resources, waste and other problems

Active Publication Date: 2022-04-22
北京中金瑞丰环保科技有限公司
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  • 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

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  • A kind of resource processing method of magnesium-containing raw material

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...

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Abstract

The present invention relates to a method for recycling magnesium-containing raw materials, which comprises steps: S1: mixing and reacting a magnesium reaction solution containing sulfate and a magnesium co-solvent with magnesium-containing raw materials, controlling the pH value of the reaction system to be less than 9.0, and , solid-liquid separation to obtain magnesium-containing solution A1 and calcium-containing slag B1; S2: react magnesium-containing solution A1 with a precipitant, control the pH value of the reaction system to 5.5-12.0, after the reaction, solid-liquid separation, obtain magnesium precipitation solution A2 and Magnesium-containing precipitation B2; S3: the calcium reaction solution containing calcium solvent, calcium co-solvent and sulfate and the calcium-containing slag B1 are mixed and reacted, and the pH value of the reaction system is controlled to 5.5-12.0. After the reaction is completed, the solid-liquid separation is obtained. Calcium-containing solution A3 and tailings B3; S4: adjust the pH value of calcium-containing solution A3 to 4.0-9.5, calcium sulfate is precipitated in calcium-containing solution A3, and solid-liquid separation is obtained to obtain calcium precipitation solution A4 and calcium-containing precipitation containing calcium sulfate B4. The present invention separates magnesium and calcium from impurities in low-grade magnesium-containing raw materials without consuming additional raw materials to obtain corresponding calcium and magnesium products, reduces the cost of recycling magnesium resources, and reduces environmental pollution.

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

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Application Information

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Patent Type & Authority Patents(China)
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
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