Treatment method of lithium carbonate precipitation mother liquor
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A technology of precipitation mother liquor and treatment method, applied in the field of ore extraction of lithium, can solve the problems of scaling and clogging of evaporation and concentration equipment, inability to obtain concentration and enrichment, low concentration of concentrated lithium, etc. The effect of continuous and stable operation and reduction of processing costs
Active Publication Date: 2019-07-23
BEIJING RESEARCH INSTITUTE OF CHEMICAL ENGINEERING AND METALLURGY
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[0007] However, the mother liquor for preparing lithium carbonate from lepidolite is different from the mother liquor of spodumene in that it contains higher potassium, especially the lithium carbonate precipitation mother liquor of lepidolite sulfate roasting process has a very high potassium content. The method of concentration after carbonate will cause lithium to enter the precipitation of potassium sulfate lithium double salt and cannot be concentra
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Embodiment 1
[0044] Measure the lithium carbonate precipitation mother liquor in 1000ml table 1, operate as follows:
[0045] ① Add concentrated sulfuric acid to destroy the remaining CO in the lithium carbonate precipitation mother liquor 3 2- , the final pH value is 8.0;
[0046] ② Freeze the precipitated mother liquor to precipitate sodium sulfate and separate it by filtration. The freezing temperature is 5°C to obtain 855ml mother liquor and 232.4g Na 2 SO 4 10H 2 O;
[0047] ③ In the beaker, evaporate and concentrate the mother liquor after freezing and analyzing sodium, and when concentrated to a volume of 300ml, a small amount of sulfate crystals are separated out;
[0048] ④Put the beaker containing the concentrated solution into an oven for drying and dehydration at a drying temperature of 105°C to obtain a mixed salt of potassium sulfate, sodium sulfate and lithium sulfate, which contains 65g of potassium sulfate, 82g of sodium sulfate, and 13g of lithium sulfate;
[0049] ...
Embodiment 2
[0051] Take 10m from Table 1 3 Lithium carbonate precipitation mother liquor, operate as follows:
[0052] ① Add concentrated sulfuric acid to destroy the remaining CO in the lithium carbonate precipitation mother liquor 3 2- , the terminal pH value is 7.5;
[0053] ②The precipitated mother liquor was frozen to precipitate sodium sulfate and separated by filtration. The freezing temperature was 0°C to obtain 8.4m 3 Mother liquor and 2534kg Na 2 SO 4 10H 2 O;
[0054] ③ Evaporate and concentrate the mother liquor after freezing and separating out sodium in the MVR to a volume of 2.7m 3 , a small amount of sulfate crystals precipitated;
[0055] ④Pump the concentrate into a spray dryer for drying and dehydration at a drying temperature of 150°C to obtain a mixed salt of potassium sulfate, sodium sulfate and lithium sulfate, which contains 646kg of potassium sulfate, 785kg of sodium sulfate, and 131kg of lithium sulfate;
[0056] ⑤All the sodium sulfate, potassium sulfat...
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Abstract
The invention provides a treatment method of lithium carbonate precipitation mother liquor. The treatment method comprises the following steps: 1) adding sulfuric acid to damage residual CO3<2-> in the lithium carbonate precipitation mother liquor; 2) freezing the precipitation mother liquor to separate sodium sulfate out, filtering and separating; 3) performing evaporation concentration on the mother liquor from which sodium is separated by refrigeration; 4) pumping concentrated liquid into a spray dryer for drying and dehydration; 5) returning sodium sulfate, potassium sulfate and lithium sulfate obtained in the spray drier and a part of sodium sulfate separated out by refrigeration to a salt roasting process for recycling potassium and the sodium and recovering lithium. The treatment method of the lithium carbonate precipitation mother liquor has the beneficial effects that the lithium in the precipitation mother liquor can be recovered fully, concentrated lithium has high concentration, and the recovery rate is approximately 100 percent. Meanwhile, the potassium sulfate and the sodium sulfate are recycled, so that the salt roasting treatment cost is lowered substantially. Moreover, concentration energy consumption is lowered through control of the end point of evaporation concentration in combination with spray drying, the scaling and salting blockage conditions of evaporation concentration are relieved substantially, and production runs continuously and steadily.
Description
technical field [0001] The invention belongs to the technical field of lithium extraction from ores, and in particular relates to a treatment method for lithium carbonate precipitation mother liquor in a lepidolite sulfate roasting process. Background technique [0002] Due to the development of electric vehicles, the demand for lithium batteries in the global market continues to rise, and the demand for lithium is also rising rapidly. How to develop and utilize various lithium resources to prepare lithium carbonate to meet the market demand for lithium carbonate is in front of us. urgent task. [0003] Lithium exists in nature in two forms: solid mineral resources and liquid deposit resources. Solid mineral resources are further divided into spodumene minerals and lepidolite minerals. China's spodumene mineral resources are relatively scarce, but lepidolite is very rich. The reserves of lepidolite in Yichun, Jiangxi Province are huge, and the lithium reserves (calculated a...
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IPC IPC(8): C01D15/06C01D5/00
CPCC01D5/00C01D15/06
Inventor 杨志平李大炳康绍辉樊兴宋艳
Owner BEIJING RESEARCH INSTITUTE OF CHEMICAL ENGINEERING AND METALLURGY
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