Method for treating waste liquid containing magnesium and/or calcium in rare earth smelting separation course

A separation process, rare earth technology, applied in chemical instruments and methods, magnesium oxide, chlorine/hydrogen chloride, etc., can solve the problems of low activity, slow reaction speed, incomplete reaction, etc., achieve shortened process flow, loose pyrolysis conditions, The effect of reducing sales pressure

Active Publication Date: 2020-04-21
GRIREM ADVANCED MATERIALS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, ammonia water, liquid caustic soda or solid calcium oxide are mainly used as saponification agents. Among them, the ammonia water saponification extraction process consumes more than 1 ton of liquid ammonia for separating 1 ton of ion ore, and all of them enter the discharge wastewater, which brings serious ammonia nitrogen pollution problems; liquid caustic soda Replacing ammonia water will more than double the cost of saponification, and discharge a large amount of sodium chloride high-salt wastewater; the solid-liquid reaction between solid calcium oxide, aqueous phase and organic phase is slow and the activity is low, resulting in incomplete reaction and precipitation of three-phase substances , affect the operation of the extraction process, and calcium oxide contains a small amount of iron, aluminum and other impurities that are extracted and enriched, affecting the rare earth extraction capacity and product quality

Method used

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  • Method for treating waste liquid containing magnesium and/or calcium in rare earth smelting separation course

Examples

Experimental program
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Effect test

Embodiment 1

[0052] Take the magnesium chloride wastewater solution with a concentration of 2.20mol / L produced in the rare earth smelting process, concentrate it to a magnesium chloride concentration of 530g / L, and then put it into a spray pyrolysis furnace for pyrolysis. The pyrolysis temperature is 600°C and the pyrolysis time is 2h. Magnesium oxide solid and gas containing hydrogen chloride, the purity of magnesium oxide is 95.0%, the gas containing hydrogen chloride is dedusted by cyclone and then absorbed by dilute hydrochloric acid to produce 20% hydrochloric acid, which is returned to the rare earth extraction and separation process as the acid for stripping.

[0053] Magnesium oxide solids were prepared by pulping and carbonization to obtain pure magnesium bicarbonate solution with a concentration of 11.5g / L. The magnesium bicarbonate solution was pretreated with 1.50mol / L P204 organic phase in comparison with O / A=1.11:1 to obtain a solution containing Magnesium-loaded organic, afte...

Embodiment 2

[0058] Take the 1.35mol / L magnesium chloride wastewater solution produced in the rare earth smelting process, concentrate it to a magnesium chloride concentration of 540g / L, spray and dehydrate it at 120°C to obtain hydrated magnesium chloride, and then add it to a fluidized bed pyrolysis furnace for pyrolysis. The temperature is 550°C, and the pyrolysis time is 1 hour to obtain solid magnesium oxide and gas containing hydrogen chloride. The purity of magnesium oxide is 92.5%.

[0059] The magnesium oxide solid, 1.40mol / L P507 organic phase and 0.90mol / L neodymium chloride solution are mixed for pre-extraction, the solid-liquid ratio of magnesium oxide solid to P507 organic phase is 1:104, and the P507 organic phase and neodymium chloride solution phase Ratio O / A=5.2:1, the obtained neodymium-containing loaded organic is used for the extraction and separation of neodymium samarium mixed rare earth feed liquid, and the relative content of impurities in the output neodymium chlor...

Embodiment 3

[0064] Take the 0.45mol / L magnesium chloride wastewater solution produced in the rare earth smelting process, concentrate it to a magnesium chloride concentration of 450g / L, spray and dehydrate it at 230°C to obtain hydrated magnesium chloride, and then add it to a fluidized bed pyrolysis furnace for pyrolysis. The temperature is 400°C, the pyrolysis time is 2 hours, and the magnesium oxide solid and hydrogen chloride gas are obtained. The purity of magnesium oxide is 87%. After the hydrogen chloride gas is dedusted by a cyclone, it is absorbed by circulating water to produce 30% hydrochloric acid, and returns to the rare earth ore acid dissolution process.

[0065] Magnesium oxide solids are prepared by pulping and carbonization to obtain pure magnesium bicarbonate solution with a concentration of 6.5g / L. The magnesium bicarbonate solution is pretreated with 1.35mol / L P507 organic phase in comparison with O / A=0.67:1 to obtain a solution containing Magnesium-loaded organic, the...

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Abstract

The invention relates to a method for treating waste liquid containing magnesium and / or calcium in the rare earth smelting separation course. The treating method comprises the following steps of performing pyrolysis on the waste liquid containing magnesium and / or calcium to obtain solid magnesium oxide and / or solid calcium oxide and gas containing hydrogen chloride, wherein after acid making, theobtained gas containing hydrogen chloride is returned for rare earth mine acid dissolution or rare earth extraction and separation, and the obtained magnesium oxide and / or calcium oxide can be directly returned for rare earth extraction and separation or be subjected to size mixing, carbonization and refining to be used as an organic pretreating agent for rare earth extraction and separation according to a specific technological process. The treating method disclosed by the invention is short in technological process and low in energy consumption; besides, the obtained products and by-productsare mutually combined with the rare earth smelting separation course, so that resource cyclic utilization is realized; and the whole course is fundamentally free from discharging of waste water and waste gas.

Description

technical field [0001] The invention belongs to the field of waste liquid treatment, and in particular relates to a treatment method for waste liquid containing magnesium and / or calcium in a rare earth smelting and separation process. Background technique [0002] my country is recognized as a major country with the richest rare earth resources in the world. After nearly 50 years of continuous development, China has established the world's largest rare earth industry system and has become the world's largest producer, exporter and consumer of rare earths. At the same time, my country's rare earth smelting and separation industry has also realized the transformation from small to large, from weak to strong. China's rare earth production was only a few thousand tons in 1980. By 2016, the output had reached 105,000 tons, accounting for 83% of the world's total production. In the industrial production of rare earths, the processes of acid dissolution, extraction and separation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B59/00C22B3/26C01B7/03C01F5/10C01F11/04
CPCC22B59/00C01B7/035C01F5/10C01F11/04C22B3/26Y02P10/20
Inventor 冯宗玉黄小卫王猛孙旭夏超徐旸陈世梁彭新林张永奇
Owner GRIREM ADVANCED MATERIALS CO LTD
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