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Calcium roasting floatation separation method for bastnaesite

A technology of bastnaesite and calcification roasting, which is applied in flotation, solid separation, etc., can solve the problems of fluorine not being utilized as resources, fluorine-containing waste water polluting the environment, complex process, etc., achieve high recovery rate of rare earth, improve economic efficiency Benefits, the effect of reducing environmental pollution

Active Publication Date: 2015-06-10
NORTHEASTERN UNIV
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Problems solved by technology

[0003] Sichuan Liangshan Rare Earth Mine is an important bastnaesite in the world, among which the Mianning County deposit is the largest; the current main bastnaesite production process is oxidation roasting-hydrochloric acid leaching-sodium hydroxide decomposition method, the minerals are oxidized roasting, hydrochloric acid leaching The obtained filter residue is a cerium oxide enrichment composed of ceria, rare earth fluoride, calcium fluoride and other refractory minerals. The rare earth needs to be further extracted with sodium hydroxide, and the alkali slurry obtained after alkali conversion contains a large amount of alkali Fluoride and fluoride need to be washed with water, so a large amount of sodium hydroxide needs to be consumed in production, and there are problems of fluorine-containing wastewater polluting the environment and wasting resources; therefore, it is necessary to develop a clean metallurgical process with high efficiency and comprehensive utilization of valuable resources such as rare earths and fluorine still an important research topic
[0008] The above-mentioned methods have the disadvantages of complex process, high cost, and failure of resource utilization of fluorine.

Method used

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  • Calcium roasting floatation separation method for bastnaesite
  • Calcium roasting floatation separation method for bastnaesite

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Experimental program
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Effect test

Embodiment 1

[0036] The composition of the bastnaesite used contains 60% rare earth oxides in terms of REO and 7% fluorine by weight percentage;

[0037] Mix bastnaesite and calcium hydroxide uniformly according to the mass ratio of 5:1, roast at 650°C for 3 hours, and cool to normal temperature to obtain roasted ore;

[0038] Put the roasted ore in the flotation cell of the flotation machine, add water and stir to form a slurry with a concentration of 200g / L, and then adjust the pH value of the slurry to 8 with 1mol / L dilute hydrochloric acid;

[0039] Add water glass to the slurry and stir, then add sodium oxalate and stir, then add sodium oleate and stir, then add No. 2 oil and stir, the stirring time after adding each agent is 3min; 0.2g / kg bastnaesite, the addition amount of sodium oxalate is 2g / kg bastnaesite, the addition amount of sodium oleate is 0.8g / kg bastnaesite, the addition amount of No. 2 oil is 2mL / kg fluorine Carbenite; Then open the inflation valve of the flotation mach...

Embodiment 2

[0043] The composition of the bastnaesite used contains 30% rare earth oxides in terms of REO and 3% fluorine by weight percentage;

[0044] Method is with embodiment 1, and difference is:

[0045] (1) Mix bastnaesite and calcium hydroxide evenly according to the mass ratio of 3:1, and roast at 500°C for 4 hours;

[0046] (2) Add water and stir to form a pulp with a concentration of 300g / L, and then use 1mol / L sodium carbonate solution to adjust the pH value of the pulp to 10;

[0047] (3) Add water glass, potassium oxalate, sodium oleate and No. 2 oil in sequence, and the stirring time after each agent is added is 4 minutes; the amount of addition is 0.4 g / kg bastnaesite in water glass, and 3 g / kg potassium oxalate Bastnaesite, sodium oleate 0.6g / kg bastnaesite, No. 2 oil 1.5mL / kg bastnaesite;

[0048](4) Carry out 5-stage screening on the roughing tailings, the weight purity of rare earth oxides obtained is 93%, the recovery rate of rare earths reaches 92%; the recovery ra...

Embodiment 3

[0050] The composition of the bastnaesite used is 70% by weight percentage containing rare earth oxide, calculated as REO, and contains 10% fluorine;

[0051] Method is with embodiment 1, and difference is:

[0052] (1) Mix bastnaesite and calcium hydroxide evenly according to the mass ratio of 7:1, and roast at 800°C for 2 hours;

[0053] (2) Add water and stir to form a pulp with a concentration of 350g / L, and then adjust the pH value of the pulp to 7 with 1mol / L dilute hydrochloric acid;

[0054] (3) Add water glass, calcium oxalate, sodium oleate and No. 2 oil in sequence, and the stirring time after each agent is added is 5 minutes; the amount of addition is 0.6g / kg bastnaesite in water glass, and 2g / kg calcium oxalate Bastnaesite, sodium oleate 0.4g / kg bastnaesite, No. 2 oil 1mL / kg bastnaesite;

[0055] (4) Carry out 9-stage screening on the roughing tailings, the weight purity of rare earth oxides obtained is 90%, the recovery rate of rare earths reaches 95%; the reco...

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Abstract

The invention belongs to the technical field of mineral processing, and relates to a calcium roasting floatation separation method for bastnaesite. The method comprises the following steps that firstly, bastnaesite and calcium hydroxide are mixed and roasted to obtain roasted ore; secondly, the roasted ore is placed in a floatation tank of a floatation machine, and water is added to form ore pulp; thirdly, water glass, oxalic acid or oxalate, sodium oleate and second oil are added in sequence and stirred, and roughing concentrate and roughing tailings are obtained through floatation; fourthly, the rouging tailings are scavenged in a five-nine level mode, and the calcium fluoride enrichment and the rare earth oxide are obtained. According to the method, the production procedure is shortened, meanwhile, consumption of reagent is reduced, resource utilization of valuable elements is achieved, the economic benefits are increased, and the environmental pollution is reduced.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, in particular to a calcification roasting flotation separation method of bastnaesite. Background technique [0002] Bastnaesite is one of the main rare earth minerals in the world, and its mineral chemical formula is RECO 3 F, can be regarded as a composite compound of rare earth fluoride and rare earth carbonate; bastnaesite has high rare earth content, and the content of rare earth oxide can reach about 70%, of which light rare earth elements are the main ones, and the content of cerium and lanthanum Accounting for 70~90%, it is the main source of light rare earths and has important industrial significance and economic value. [0003] Sichuan Liangshan Rare Earth Mine is an important bastnaesite in the world, among which the Mianning County deposit is the largest; the current main bastnaesite production process is oxidation roasting-hydrochloric acid leaching-sodium hydroxide decomp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02B03B1/00B03D1/00
Inventor 吴文远岑鹏边雪
Owner NORTHEASTERN UNIV
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