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High-temperature smelting method for decomposing bastnasite

A high-temperature smelting technology of bastnaesite, which is applied in the high-temperature smelting field of decomposing bastnaesite, can solve the problems of slow reaction process, long process flow, environmental pollution, etc., and achieve the effect of low production cost and shortened process flow

Pending Publication Date: 2020-01-14
华卫国 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The alkali conversion method and the oxidative roasting method both use sodium hydroxide alkali conversion. This process is long and produces a large amount of fluorine-containing wastewater and alkali-containing wastewater, which causes great pollution to the environment. For these two methods, wastewater treatment is a big problem
[0007] In general, the current methods for decomposing bastnaesite have long process flow and slow reaction process, which can easily cause environmental pollution, tail gas, and high cost of wastewater treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0034] A high-temperature smelting method for decomposing bastnaesite, comprising the following processes:

[0035] (1) Mixing bastnaesite and carbon reducing agent to make balls (the ratio of the sum of alkali metal content and alkaline earth metal content to fluorine content in bastnaesite is ≥1.5:1); bastnaesite and carbon reducing agent The weight ratio of the carbon reducing agent is 100:5~25 (the specific addition amount of the carbon reducing agent is determined according to the total content of non-rare earth elements such as alkali metals, alkaline earth metals, lead, zinc, manganese, barium, and fluorine in the bastnaesium lanthanum raw ore. To ensure that carbon The amount of the reducing agent is 1.5 times the total content of the above-mentioned non-rare earth elements).

[0036] (2) Place the arc starting material (graphite block / strip) in the smelting equipment. The amount of the arc starting material is 3~5% of the furnace volume. Put down the electrode rod and...

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Abstract

The invention discloses a high-temperature smelting method for decomposing bastnasite. The high-temperature smelting method comprises the step that smelting is performed after the bastnasite and a reducing agent are mixed and pelletized; an arc striking material is arranged in smelting equipment; inert gas is injected during smelting; and the inert gas is preferably argon gas. In the step, the smelting method is a submerged arc method, i.e., an electrode bar strikes the arc at the bottom part of the smelting equipment, and the electrode bar moves from bottom to top; in the step, the goal of pelletizing is to increase the product recovery rate; and in the step, the reducing agent is a carbon reducing agent.

Description

technical field [0001] The invention relates to rare earth treatment technology, in particular to a high-temperature smelting method for decomposing bastnaesite. Background technique [0002] Rare earth ores are divided into bastnaesite and ion-type adsorption ores. The decomposition and extraction of bastnaesite are basically divided into three methods: sulfuric acid roasting method, alkali conversion decomposition method and oxidation roasting method. For rare earths, these are treatment methods below 1000°C, and bastnaesite remains in a solid state below 1000°C. [0003] Sulfuric acid roasting method is used to decompose bastnaesite. In order to solve the rare earth phosphate and rare earth fluoride in the ore, phosphorus, fluorine and rare earth are separated, and sulfuric acid is added to roast in the rotary kiln. During the roasting process, a large amount of sulfide gas and hydrogen fluoride are released. Therefore, the tail gas treatment of sulfuric acid roasting me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/00C22B1/24C22B3/10C22B59/00C22B1/11
CPCC22B1/00C22B1/11C22B1/2406C22B3/10C22B59/00Y02P10/20
Inventor 华卫国郑宝林
Owner 华卫国