Process for rare-earth smelting resource reclamation and cyclic production

A process method and resource-based technology, applied in the field of rare earth smelting resource recovery and recycling production, can solve the problems of no major breakthrough, waste, and no solution, and achieve the effect of breaking through the technical bottleneck

Inactive Publication Date: 2010-11-10
马克印 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0089] To sum up, there has been no real breakthrough from the perspective of pollution control in the process system of rare earth smelting and extraction, including no major breakthrough in the research of mechanism. The problem of resource utilization and circular production has been considered comprehensively, so that the problem of serious pollution and waste of resources has not been resolved; the main manifestation is that the rare earths are derived from oxides

Method used

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  • Process for rare-earth smelting resource reclamation and cyclic production
  • Process for rare-earth smelting resource reclamation and cyclic production
  • Process for rare-earth smelting resource reclamation and cyclic production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0194] 1. Mix the rare earth concentrate containing 20-70wt% REO into sulfuric acid with a concentration of 70wt% and sulfuric acid with a concentration of 93wt%. The mineral-acid ratio (weight ratio) is 1.1-2.1. , keep the kiln head at a temperature of 500-600°C, and the kiln tail at about 150-200°C. The material stays in the kiln for 1 to 1.5 hours to obtain the rare earth sulfate roasted ore.

[0195] 2. The 150-200°C high-temperature acid tail gas generated during the roasting process enters the tail gas deep purification and waste acid recovery system for deep purification and recovery. The recovered concentration is more than 70wt%. The sulfuric acid is returned to the concentrate for roasting and reused. Enter the fluoride salt preparation system to produce various fluoride salts.

[0196] 3. Mix the roasted ore with the recovered and supplemented ammonium bicarbonate to form a high-concentration phase slurry, and then enter the closed continuous reactor, control the t...

Embodiment 2

[0207] 1000g Baotou mixed rare earth concentrate (REO: 50.5wt%, FeO: 3.1wt%, P 2 o 5 : 2.6wt%, ThO 2 : 0.21wt%, CaO: 8.4wt%) and sulfuric acid (70wt% concentration: 93wt% concentration = 1: 3.5) are mixed by acid ore ratio 1: 1.8 at material temperature 350~400 ℃ of roasting 1.5~2 hours, draw Roasted ore 1390.2g, analysis wherein the main components REO: 34.5wt%, CaO: 5.9wt%.

[0208] Weigh 1000g of roasted ore, add 4000ml of tap water, 530g of ammonium bicarbonate, and stir evenly. Then pour it into a closed reactor, control the temperature at 70-90°C and react for 0.5-1.0 hours, the reaction pressure is gradually reduced from 0.2MPa to -0.09MPa, the gas in the reactor is cooled and absorbed by the coil cooler and absorber, and the slurry is vacuum pumped After the filtered carbide ore was dried at 105° C. for 2 hours, the dry filter cake weighed 657.2 g, of which REO: 52.5 wt %, CaO: 8.9 wt %. Obtain mother liquor and adopt after stepwise concentrated crystallization to ...

Embodiment 3

[0210] Get 500g carbonized rare earth ore with 5-8wt%NH 4 Cl solution 2000ml water stirring reaction and maintaining the reaction temperature 40 ~ 65 ℃, adding a small amount of 2wt% hydrochloric acid during the control process to maintain PH = 3 ~ 5 reaction for 15 ~ 60 minutes, then filtered, separated, dried to obtain 470g of dry weight filter cake; to obtain the mother liquor 1850ml, composition CaO2.25%, repeated test phenomenon and results are basically the same, the dissolution rate of total calcium is more than 80%.

[0211] Take 1000g of finely dissolved carbide ore, add 4000ml of water and 650g of ammonium chloride and mix, then pour into a closed reactor at a temperature of 115-150°C, stir and react for 2-3.5 hours, and the reaction pressure is gradually reduced from 0.5MPa to - 0.09MPa, the gas in the reactor is absorbed into ammonium bicarbonate liquid through the coil cooler and absorber for reuse, the air is finally evacuated through the vacuum pump, the slurry ...

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Abstract

The invention relates to a process for rare-earth smelting resource reclamation and cyclic production. The process has the main characteristic of comprehensively and systematically solving the problems of environmental protection and industrial promotion of the whole rare-earth industrial chain by adopting innovative integrated technical means. The process mainly comprises administration and comprehensive utilization of waste gas, waste water and waste slag, revolution of a rare-earth smelting process, and reclamation and repeated utilization of various important resources such as sulfur, fluorine, ammonium, thorium, phosphorus, calcium and the like so as to achieve smokeless and harmless treatment of the waste gas, full utilization of the resources and zero discharge of industrial waste water and fulfill the final goal of cyclic production. The process radically solves the maximum environment-friendly bottleneck problem in a sustainable development process of the Baotou rare-earth industry from resource advantage to industrial advantage, in particular the historical key environment-friendly technical problem, reduces energy consumption of a large amount of resources and pollutiondischarge, greatly reduces the production cost, upgrades the rare-earth industry, and extends the larger industrial chain at the same time.

Description

technical field [0001] The present invention relates to a rare earth smelting resource recycling and recycling production process, in particular to a rare earth clean production process combining environmental protection technology and rare earth smelting technology for resource comprehensive utilization and circular production, belonging to rare earth smelting and industrial environment protect the technical field. Background technique [0002] There are generally two types of rare earth production methods using Baotou rare earth concentrates: acid method and alkali method. Considering the source of raw materials, economic characteristics, and degree of large-scale industrialization, most of them use the acid method, which has experienced high temperature and medium temperature. At present, the technology exploration and practice in the stage of high temperature, low temperature and other stages are mainly three-generation acid-process high-temperature roasting production p...

Claims

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Application Information

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IPC IPC(8): C22B59/00C22B1/06C22B3/00C22B3/26
CPCY02P10/20
Inventor 马克印杨启山王晓铁李春亭张雪峰
Owner 马克印
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