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Method for low-calcium high-grade mixed type rare-earth concentrate circulating slurrying decomposition

A mixed rare earth, high-grade technology, applied in the direction of rare earth metal compounds, rare earth metal halides, chemical instruments and methods, etc., can solve problems such as equipment looping, achieve the effects of inhibiting dissolution, solving equipment technical problems, and solving equipment looping Effect

Inactive Publication Date: 2019-03-29
BAOTOU RES INST OF RARE EARTHS +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] Aiming at various problems existing in the prior art, the present invention provides a low-calcium and high-grade mixed type rare earth concentrate pulping cycle decomposition method, which greatly reduces the consumption of acid, alkali and energy, and solves the problems of concentrated sulfuric acid and rare earth concentrate. Problems such as ringing of equipment during ore-solid reaction, and comprehensive recovery of valuable resources such as fluorine, phosphorus, and thorium

Method used

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  • Method for low-calcium high-grade mixed type rare-earth concentrate circulating slurrying decomposition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029]100g of REO is 65.7%, CaO is 2.86% mixed rare earth concentrate and mass percent is 70% sulfuric acid solution is mixed according to liquid-solid ratio 3:1 (sulfuric acid: mineral weight ratio is 3.4:1), stirring and heating Insulate at 150°C for 0.5h, and the tail gas is condensed and absorbed to produce by-products of fluorine and silicon mixed acid. After the reaction and solid-liquid separation, the acid leaching slag was leached twice with 1500mL of water, and the water leaching solution was neutralized to form iron phosphorus thorium slag and REO concentration of 31.6g / L rare earth sulfate solution. Calculated by F in water leaching residue, the decomposition rate of fluorine-containing minerals is 97.4%. The acid leaching liquid continues to replenish concentrated sulfuric acid with a mass percentage of 98% to 70%, and then circulates the second batch of concentrate. Keep the reaction temperature, acid amount, acid concentration, reaction time, etc. under the sam...

Embodiment 2

[0032] 100g of REO is 65.7%, CaO is 2.86% mixed rare earth concentrate and mass percent is 40% sulfuric acid solution is mixed according to liquid-solid ratio 3:1 (sulfuric acid: mineral weight ratio is 1.6:1), stirring and heating Insulate at 110°C for 5 hours, and the tail gas is condensed and absorbed to produce by-products of fluorine and silicon mixed acid. After the reaction and solid-liquid separation, the acid leaching slag was leached twice with 1500mL of water, and the water leaching solution was neutralized to form iron phosphorus thorium slag and REO concentration of 21.5g / L rare earth sulfate solution. Calculated by F in water leaching residue, the decomposition rate of fluorine-containing minerals is 73.4%. The acid leaching liquid continues to replenish concentrated sulfuric acid with a mass percentage of 98% to 40%, and then circulates the second batch of concentrate. Keep the reaction temperature, acid amount, acid concentration, reaction time, etc. under the...

Embodiment 3

[0035] Mix 100g of mixed rare earth concentrate with 67.9% REO and 1.96% CaO and 70% sulfuric acid solution at a liquid-solid ratio of 4.5:1 (sulfuric acid:mineral weight ratio is 5:1), stir and heat Insulate at 130°C for 1.5h, and the tail gas is condensed and absorbed to produce by-products of fluorine and silicon mixed acid. After the reaction and solid-liquid separation, the acid leaching slag was leached twice with 1500mL of water, and the water leaching solution was neutralized to form iron phosphorus thorium slag and REO concentration of 33.1g / L rare earth sulfate solution. Calculated by F in water leaching residue, the decomposition rate of fluorine-containing minerals is 96.7%. The acid leaching liquid continues to replenish concentrated sulfuric acid with a mass percentage of 98% to 70%, and then circulates the second batch of concentrate. Keep the reaction temperature, acid amount, acid concentration, reaction time, etc. under the same conditions as the first time,...

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Abstract

The invention relates to a method for low-calcium high-grade mixed type rare-earth concentrate circulating slurrying decomposition, and belongs to the field of hydrometallurgy. The method comprises the following steps that an absolute excess low-concentration sulfuric acid solution is adopted, fluorine-carbon cerium ore in a low-calcium high-grade mixed concentrate is rapidly decomposed by a slurrying reaction under the heating condition; and after the reaction, acid leaching slag is soaked in water to dissolve calcium sulfate and rare earth sulfate into water immersion liquid, and impuritiesare removed in the water immersion liquid to form phosphorus-iron-thorium slag. After the acid leaching liquid supplements sulfuric acid, new ore is recycled, and the concentrated alkali liquor is used for decomposing water leaching slag and the phosphorus-iron-thorium slag. The alkali wastewater is crystallized and recycled, and the sodium phosphate is recycled. The method is suitable for low-calcium high-grade mixed type rare-earth concentrate treatment, fluorine and phosphorus resources in the mixed rare-earth concentrate can be recycled, sulfuric acid, sodium hydroxide, energy consumptionand the like are reduced to the theoretical consumption, the problems that the concentrated sulfuric acid and the rare-earth concentrate are subjected to solid-solid-solid-phase reaction equipment crusting and the like are solved, and industrialization is easy to realize.

Description

technical field [0001] The invention relates to a hydrometallurgical technology, in particular to a method for circulating slurrying and decomposing low-calcium and high-grade mixed rare earth concentrates. Background technique [0002] As the rare earth deposit with the largest proven reserves and mining volume in the world, Baotou Baiyun Obo Mine contains rich rare earth resources. The mixed rare earth concentrate obtained by beneficiation is composed of bastnaesite and monazite, and the ratio is generally between 9:1 and 3:2. Due to the complexity of the composition of the concentrate, there are many changes in the smelting and separation process of the concentrate . [0003] At present, the industrialized mixed rare earth concentrate decomposition technology mainly includes concentrated sulfuric acid high-temperature roasting decomposition process and concentrated alkali solution atmospheric pressure decomposition process. The high-temperature roasting and decompositio...

Claims

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Application Information

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IPC IPC(8): C22B59/00C22B3/08C22B3/12C22B3/10C22B3/04C22B60/02C01B25/30C01F17/00C01B7/19
CPCC01B7/19C01B25/30C01F17/271C22B3/04C22B3/08C22B3/10C22B3/12C22B59/00C22B60/02Y02P10/20
Inventor 崔建国徐萌李波王哲侯睿恩申孟林田皓陈禹夫张洋郝肖丽
Owner BAOTOU RES INST OF RARE EARTHS
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