Method for producing gypsum as byproduct in preparation of lithium carbonate by using lepidolite from tantalum-niobium tailings
A technology of tantalum-niobium tailings and lepidolite, applied in lithium carbonate;/acid carbonate, calcium/strontium/barium sulfate, etc., can solve problems such as poor water resistance and frost resistance
Inactive Publication Date: 2011-09-07
YICHUN UNIVERSITY
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Problems solved by technology
[0025] g Poor water resistance and frost resistance
Method used
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Experimental program
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Effect test
Embodiment 1
[0056] The concentration involved in the embodiment is the mass concentration, now the process of extracting lithium or salt of wormwood as a raw material with lepidolite is used to illustrate the method for preparing gypsum with higher purity in lithium carbonate from lepidolite.
[0057] The lepidolite that present embodiment selects adopts and produces from Yichun tantalum niobium lithium ore, and its each main chemical composition is as follows:
[0058] Li 2 o
[0059] Grind the above-mentioned lepidolite powder to about 200 meshes, put the sulfuric acid solution with a concentration of 30%-70% into the reaction device according to the ratio of solid-liquid mass ratio of 1:2-8, and carry out the acid leaching defluorination reaction for 3-10 hours, and the reaction temperature is 60-60 200°C; after the reaction is completed and the feed is fed, the feed liquid is centrifuged to remove slag, the feed liquid is the mother liquid, and the mother liquid is subjecte...
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Abstract
The invention provides a method for producing gypsum which is a byproduct in preparation of lithium carbonate by using lepidolite from tantalum-niobium tailings. The method comprises an acid dipping step in which a dilute sulfuric acid solution is added to a lepidolite raw material and a neutralization fluoride removal step. The invention is characterized in that the method comprises the following steps: pulverizing lepidolite to form lepidolite powders with a particle size of about 200 meshes; feeding the lepidolite powders into a reactor together with a sulfuric acid solution with a concentration of 30% to 70%, with a solid-liquid mass ratio of 1:(2-8); allowing fluoride removal reactions to take place for 3 to 10 hours under such a condition that the reaction temperature ranges from 60 DEG C to 200 DEG C; separating the produced hydrofluoric acid under vacuum after the reactions are completed to form a solid-liquid mixture; filtering off residues to form a mother liquid; performing neutralization fluoride removal, which is implemented by adding equivalent amount of water to the hydrofluoric acid solution that is separated under vacuum into the solid-liquid mixture and then adding calcium hydroxide; adjusting the pH of the liquid within the range from 5 to 7; and filtering to obtain high-purity gypsum.
Description
technical field [0001] The invention belongs to the field of chemistry and chemical engineering, and relates to a method for preparing lithium carbonate by using tantalum-niobium tailings lepidolite to obtain gypsum as a by-product. Background technique [0002] The tantalum-niobium-lithium mine in Yichun, Jiangxi is currently the largest tantalum-niobium-lithium mine in Asia. It contains rich rare metal materials such as tantalum, niobium, lithium, potassium, sodium, rubidium, and cesium. Lepidolite is a by-product obtained by flotation of tantalum-niobium mining tailings. Using lepidolite to prepare lithium carbonate can control the reaction conditions and obtain a large amount of high-quality by-product gypsum. This is very important economically and strategically for the comprehensive development and utilization of tantalum-niobium-lithium mines in Yichun, Jiangxi. value. [0003] Gypsum is mainly hydrous calcium sulfate (CaSO 4 2H 2 O), often contains organic matter,...
Claims
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IPC IPC(8): C01D15/08C01F11/46
Inventor 陆云华朱笃刘万云汤洪波邹怀波周伟华
Owner YICHUN UNIVERSITY