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A method for comprehensive utilization of magnesium slag

A magnesium slag and potassium carbonate technology, applied in the field of comprehensive utilization of waste resources, can solve the problems of restricting the large-scale application of magnesium reduction furnace slag, complex production process, unstable composition, etc., and achieve the restoration of heavy metal polluted soil, easy access to raw materials, The effect of process environmental protection

Active Publication Date: 2017-05-17
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] During the smelting process of metal magnesium by the Pidgeon method, a large amount of magnesium slag will be produced, and the random discharge and accumulation of magnesium slag will occupy a large amount of land resources and cause serious environmental pollution. In order to effectively utilize these discarded magnesium slags, many efforts have been made Research, and achieved certain research results, currently mainly used to make magnesia slag bricks, wall materials, cement ingredients (patent application number: 200810166909.9) and desulfurizers, the added value of the developed products is low, and due to the magnesia slag The MgO content is too high, and the composition is not stable, which is easy to cause the hardened body of magnesia slag bricks, wall materials and cement products to swell and crack, which limits the large-scale application of magnesium reduction furnace slag (GB / T 13933-2009); The research on desulfurizer is still in the experimental stage, and there are still many restrictions on industrial use
Although some research and development have been carried out as agricultural fertilizers and soil improvers (patent application number: 201010553703.9), some beneficial components in magnesium slag are simply utilized, such as CaO, SiO 2 , MgO, etc., the fertilizer efficiency is low, and the production process is relatively complicated, and the application range is small

Method used

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  • A method for comprehensive utilization of magnesium slag
  • A method for comprehensive utilization of magnesium slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] according to figure 1 In the process flow shown, the magnesium slag is ground to 120 mesh with a grinding machine, and the ingredients are: 65g of magnesium slag, 35g of potassium carbonate, 6g of boric acid, mix the magnesium slag, industrial potassium carbonate and boric acid, and put in corundum Put the corundum crucible into a temperature-controllable high-temperature electric furnace, heat up, the heating temperature is 1290 ° C, and the holding time is 40 minutes. After the heat preservation, the sample is cooled to room temperature by air. The sample is a relatively loose block. Grinding to 35 mesh, the obtained magnesium slag product is bagged and sealed.

[0024] The magnesium slag product obtained through the above process has an effective silicon content of 11%, and its water-soluble initial dissolution rate and 28-day cumulative dissolution rate are respectively 27% and 52% through the slow-release fertilizer national standard method analysis, and the initia...

Embodiment 2

[0026] Grind the magnesium slag to 150 mesh with a pulverizer, and add the following ingredients: 70g of magnesium slag, 30g of potassium carbonate, and 7g of boric acid. Mix the magnesium slag, industrial potassium carbonate and boric acid, and put them into a corundum crucible; Put it in a temperature-controllable high-temperature electric furnace, heat up, the heating temperature is 1250 ° C, and the holding time is 60 minutes. After the heat preservation, the sample is cooled to room temperature by air. The sample is a relatively loose block, which is ground to 35 mesh. The vested magnesium slag products are bagged and sealed.

Embodiment 3

[0028] Grind the magnesium slag to 180 mesh with a pulverizer, and add the following ingredients: 75g of magnesium slag, 25g of potassium carbonate, 10g of borax, mix the magnesium slag and industrial potassium carbonate, and put them into a corundum crucible; put the corundum crucible into In a temperature-controllable high-temperature electric furnace, heat up, the heating temperature is 1200°C, and the holding time is 60 minutes. After the heat preservation, the sample is cooled to room temperature by air. Slag products, bagged and sealed.

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Abstract

The invention provides a method for comprehensively using magnesium slag and is a novel method for expanding the recycling application field and range of magnesium slag, and belongs to the technical field of comprehensive utilization of waste resources. The method for comprehensively using magnesium slag comprises the following steps: dosing: firstly utilizing high-temperature waste heat of waste magnesium slag generated in a magnesium smelting process; then, crushing the magnesium slag; adding potassium carbonate and boron additives; and uniformly mixing and briquetting; calcining: putting the uniformed ingredients in a high-temperature electric furnace; heating to 1200-1300 DEG C; and insulating for 40-60 minutes; cooling: after utilizing waste heat of the ingredients after calcining reaction, cooling to room temperature to obtain a semi-finished product; and grinding: grinding the semi-finished product, and packaging and sealing to obtain a novel magnesium slag product.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization of waste resources, in particular to a method for comprehensive utilization of magnesium slag. Background technique [0002] During the smelting process of metal magnesium by the Pidgeon method, a large amount of magnesium slag will be produced, and the random discharge and accumulation of magnesium slag will occupy a large amount of land resources and cause serious environmental pollution. In order to effectively utilize these discarded magnesium slags, many efforts have been made Research, and achieved certain research results, currently mainly used to make magnesia slag bricks, wall materials, cement ingredients (patent application number: 200810166909.9) and desulfurizers, the added value of the developed products is low, and due to the magnesia slag The MgO content is too high, and the composition is not stable, which is easy to cause the hardened body of magnesia slag brick...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G3/00C05G3/04B09B3/00C05G3/80
CPCC05D1/00C05G3/80C05D5/00C05D9/02Y02P20/129
Inventor 程芳琴李咏玲张宝琼廖洪强郭彦霞
Owner SHANXI UNIV
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