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Transformation method for mixed rare earth concentrate and concentrated sulfuric acid low-temperature roasted ore

A mixed rare earth and low-temperature roasting technology, which is applied in the direction of improving process efficiency, can solve the problems of many transformation steps, high consumption of chemical reagents, and restrictions on the promotion of low-temperature roasting process of concentrated sulfuric acid.

Inactive Publication Date: 2012-07-11
BERIS ENG & RES CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0021] It can be seen that the so-called low-temperature roasting ore produced by low-temperature roasting of concentrated sulfuric acid has many transformation steps, and the consumption of chemical reagents is high, which restricts the promotion of the low-temperature roasting process of concentrated sulfuric acid to a certain extent.

Method used

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  • Transformation method for mixed rare earth concentrate and concentrated sulfuric acid low-temperature roasted ore
  • Transformation method for mixed rare earth concentrate and concentrated sulfuric acid low-temperature roasted ore
  • Transformation method for mixed rare earth concentrate and concentrated sulfuric acid low-temperature roasted ore

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Experimental program
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Effect test

Embodiment 1

[0083] The roasted ore products produced by low-temperature roasting are processed separately by using the thick slurry transformation method and the current traditional water leaching, double salt precipitation, alkali conversion and acid-dissolution methods.

[0084] A. Primary grinding of roasted ore: After cooling the low-temperature roasted ore product to 98°C, put it into the storage bin 1, and feed it to the ball mill 3 through the vibrating feeder 2. The ball mill 3 grinds the roasted ore to less than 1mm, and the ball mill 3 is equipped with ventilation. Dust removal system, the ventilation and dust removal system keeps the primary grinder from the feed port to the discharge port to maintain the forward airflow, and collects the dust generated by the grinding into the bag filter 5, and combines the recovered dust with the fine materials obtained by grinding, and the ball mill 3 grinds the obtained fine materials Through the material belt conveyor 4, it is continuously ...

Embodiment 2

[0090] Except following steps, the step of this embodiment is identical with thick slurry transformation embodiment 1:

[0091] The residence time of the secondary grinding is 60 minutes, and the weight ratio of ammonium bicarbonate, roasted ore fines and water used is 1: 2.2: 9.1, that is, based on the treatment of 1000g dry ore, the amount of ammonium bicarbonate added is 942g, adding 8.2 kg of water for washing; 820 g of nitric acid was used in the acid dissolution step, and the pH was adjusted to 3; the pH value was adjusted to 5 in the purification step, and 20 g of barium chloride was added. Obtain 1.5 liters of rare earth nitric acid solutions through the above steps, obtain acid-dissolved slag 600g, contain ammonium sulfate 120g / liter, ammonium hydrogen phosphate and ammonium dihydrogen phosphate (in ammonium phosphate) 10 g / liter of waste water 9 liters.

Embodiment 3

[0093] Except following steps, the step of this embodiment is identical with thick slurry transformation embodiment 1:

[0094] Directly carry out the grinding and thickening conversion operation, the grinding and thickening conversion step lasts for 120 minutes, and the weight ratio of ammonium bicarbonate, roasted ore fine material and water used is 1: 2.2: 9.1, that is, based on the treatment of 1000g of dry ore, The amount of ammonium bicarbonate added is 942g, and 8.5kg of washing water is added; the acid dissolution step uses 820g of nitric acid, wherein the pH is adjusted to 1.5; the purification step is adjusted to a pH value of 5, and 20g of barium chloride is added. Obtain 1.3 liters of rare earth nitric acid solution through the above steps, obtain acid-dissolved slag 620g, contain ammonium sulfate 126g / liter, ammonium hydrogen phosphate and ammonium dihydrogen phosphate (calculated as ammonium phosphate) 11 grams / liter of waste water 8.5 liters.

[0095] 3. The cur...

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Abstract

The invention relates to a transformation method for mixed rare earth concentrate and concentrated sulfuric acid low-temperature roasted ore. The method is characterized by comprising the following steps: (1) grinding and concentrated pulp transformation reaction, namely adding ammonium hydrogen carbonate and water into the roasted ore to form a mixture, grinding the mixture in the concentrated pulp state, transforming the mixture into concentrated pulp, and performing solid liquid separation; (2) acid dissolution, namely dissolving the solid obtained in the concentrated pulp transformation step by using acid and filtering; and (3) purification, namely adjusting the pH value of the filtrate obtained in the acid dissolution step, precipitating iron and thorium ions, precipitating sulfate radicals, and performing solid liquid separation. According to the method, the ammonium hydrogen carbonate completely contacts and reacts with the roasted ore; the problem that rare earth phosphate precipitate is easy to generate because the pH value is adjusted by adding alkaline substances after water leaching is solved; the complex transformation method of performing complex salt precipitate alkaline transformation and acid dissolution after water leaching is avoided; and phosphorus and thorium resources can be recovered.

Description

technical field [0001] In the present invention, the mixed rare earth concentrate mainly composed of rare earth fluorocarbonate, rare earth phosphate, and fluorite is uniformly mixed with concentrated sulfuric acid, and then roasted at low temperature, and the roasted ore obtained by roasting is ground with ammonium bicarbonate to transform into thick slurry with water The process method belongs to the technical field of rare earth wet production process. Background technique [0002] The technology relates to a mixed rare earth concentrate whose components are mainly rare earth fluorocarbonate, rare earth phosphate and fluorite. my country is rich in rare earth concentrate resources, accounting for nearly 50% of the world's reserves. [0003] The mineral decomposition method of this kind of mixed rare earth concentrate is mainly concentrated sulfuric acid roasting method. In this method, the main reaction is the following formula a~i: [0004] a.2REFCO 3 +3H 2 SO 4 →RE...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B59/00C22B60/04C22B3/14C22B1/06
CPCY02P10/20
Inventor 赵铭胡政波庞宏刘新业
Owner BERIS ENG & RES CORP
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