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Low-grade mixed rare earth ore concentrate chemical dressing and chemical dressing waste water resource comprehensively recycling method

A mixed rare earth, low-grade technology, applied in mining wastewater treatment, chemical instruments and methods, ammonium chloride, etc., can solve the problems of large resource loss, no practicability, and difficult comprehensive recovery, and achieves savings in beneficiation costs. The effect of saving acid and alkali consumption and improving the utilization rate of raw ore

Active Publication Date: 2016-06-15
BAOTOU RES INST OF RARE EARTHS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the past, during the chemical separation process of low-grade mixed rare earth minerals, resources such as REO, F, and P were lost, and comprehensive recovery was difficult, and there was no practicality
Therefore, the alkaline process can only be forced to use concentrates with REO grade ≥ 60at% as raw materials

Method used

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  • Low-grade mixed rare earth ore concentrate chemical dressing and chemical dressing waste water resource comprehensively recycling method
  • Low-grade mixed rare earth ore concentrate chemical dressing and chemical dressing waste water resource comprehensively recycling method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 100.0g of mixed rare earth concentrate with 51.7% REO and 13.2% CaO, hydrochloric acid solution with a concentration of 4mol / L of hydrogen ion substance and concentrated sulfuric acid with a mass percentage of 92.5% Proportional mix. The solid-to-liquid volume ratio of low-grade mixed rare earth concentrate to hydrochloric acid solution is 1:5; the ratio of concentrated sulfuric acid to hydrochloric acid solution is 10 grams of enhanced impurity remover per liter of hydrochloric acid solution. Stir and dissolve for 180 minutes under the condition of 92°C≤temperature≤95°C. After the dissolution was completed, 67.2 g of chemical separation concentrate and chemical separation wastewater with a mass percentage of REO of 69.85% and a mass percentage of CaO of 0.53% were obtained by filtration.

[0030] Take 100ml of chemical separation waste water, according to H 2 SO 4 The amount of the substance and the amount of the CaO substance in the chemical separation wastewater a...

Embodiment 2

[0033] 100.0g of mixed rare earth concentrate with 54.2% REO and 12.5% ​​CaO, hydrochloric acid solution with a concentration of 3mol / L of hydrogen ion substances and concentrated sulfuric acid with a mass percentage of 98% Proportional mix. The solid-to-liquid volume ratio of low-grade mixed rare earth concentrate to hydrochloric acid solution is 1:4; the ratio of concentrated sulfuric acid to hydrochloric acid solution is 20 grams of enhanced impurity remover per liter of hydrochloric acid solution. Stir and dissolve at a temperature of 95°C for 120 min. After the dissolution, 73.2 g of chemical separation concentrate and chemical separation waste water with a mass percentage of REO of 68.5% and a mass percentage of CaO of 0.83% were obtained by filtration.

[0034] Take 100ml of chemical separation waste water, according to H 2 SO 4 The amount of the substance and the amount of the CaO substance in the chemical separation wastewater are in excess of 40% according to the ...

Embodiment 3

[0037] 100.0g of mixed rare earth concentrate with 48.7% REO and 13.8% CaO, hydrochloric acid solution with a concentration of 2.5mol / L of hydrogen ion substances and concentrated sulfuric acid with a mass percentage of 98% Mix in proportion. The solid-to-liquid volume ratio of low-grade mixed rare earth concentrate to hydrochloric acid solution is 1:6; the ratio of concentrated sulfuric acid to hydrochloric acid solution is 15 grams of enhanced impurity remover per liter of hydrochloric acid solution. Stir and dissolve at a temperature of 95°C for 180 min. After the dissolution, 77.2 g of chemical separation concentrate and chemical separation waste water with REO mass percentage content of 62.1% and CaO mass percentage content of 2.41% were obtained by filtration.

[0038] Take 100ml of chemical separation waste water, according to H 2 SO 4 The amount of the substance and the amount of the CaO substance in the chemical separation wastewater are in excess of 40% according ...

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Abstract

The invention relates to a low-grade mixed rare earth ore concentrate chemical dressing and chemical dressing waste water resource comprehensively recycling method, which is characterized by comprising the steps of: A) performing mixed chemical dressing to the low-grade ore concentrate (REO -50%, 8% <= CaO <= 15%) with a hydrochloric acid solution and an enhanced impurity remover; B) adding a sulfuric acid solution to chemical dressing waste water to remove Ca<2+> to form calcium sulphate dihydrate; C) treating the low-grade mixed rare earth ore concentrate with the chemical dressing waste water after calcium removal; D) after the calcium removal of the cyclic chemical dressing waste water, neutralizing the waste water with ammonia water or liquid ammonia step-by-step to respectively recycle iron, rare earths, a phosphorus enriched product and a crude calcium fluoride side product; and E) evaporating and concentrating the waste water to obtain ammonium chloride crystal and distilled water. In the method, through enhanced chemical dressing technology, the low-grade mixed rare earth ore concentrate is enriched according to 62% <= REO grade <= 70% and CaO <= 2.5%. With the difference of physical and chemical properties of the salts in the mixture liquid and the characters of the rare earth ore treatment process, the method enriches the ore and achieves resource comprehensive utilization easily and high-effectively.

Description

technical field [0001] The invention relates to a method for comprehensive recycling of low-grade rare earth concentrate chemical separation and chemical separation wastewater resources, belonging to the field of hydrometallurgy. Background technique [0002] At present, the main product of Baiyun Obo Rare Earth Minerals processed by Baotou Iron and Steel Rare Earth Concentrator is low-grade mixed rare earth concentrate (45at%≤REO mass percentage content≤55at%, 8at%≤CaO mass percentage content≤15at%, the same below ). In order to cooperate with the new clean smelting process of concentrated alkali solution, the rare earth concentrator will also produce mixed rare earth concentrate with REO grade of 65at% in the future upgrading process. [0003] The smelting process of mixed rare earth concentrate is mainly concentrated sulfuric acid high-temperature roasting decomposition process (referred to as "high-temperature acid method", hereinafter the same) and concentrated alkali ...

Claims

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Application Information

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IPC IPC(8): C02F9/10C01C1/16C22B59/00C22B7/00C02F1/52C02F1/66C02F103/10
CPCC01C1/164C02F1/04C02F1/52C02F1/66C02F9/00C02F2101/10C02F2103/10C02F2301/08C22B7/007C22B7/008C22B59/00Y02P10/20
Inventor 崔建国侯睿恩王哲郝肖丽马志鸿张丞王荣李赫陈天炜张丽常觐男
Owner BAOTOU RES INST OF RARE EARTHS
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