Method for producing lithium phosphate by using lithium-containing waste liquid

A technology of lithium phosphate and waste liquid, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of land occupation, environmental pollution, etc., and achieve the effects of saving production costs, high conversion rate, and full utilization of lithium resources

Active Publication Date: 2012-12-12
BAIYIN ZHONGTIAN CHEM
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Problems solved by technology

[0005] In view of the above situation, using the "3R" principle of circular economy to fully save the existing lithium resources and complete the recycling of the entire lithium resource is a top priority. At present, the industrial production of lithium sulfate, lithium nitrate, lithium chloride, lithium fluoride and other processes The by-product mother liquor is discarded as wastewater, which not only pollutes the environment, but also takes up a lot of land

Method used

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  • Method for producing lithium phosphate by using lithium-containing waste liquid

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Embodiment 1

[0016] The method for producing lithium phosphate from the lithium-containing waste liquid of this embodiment specifically includes the following steps: adding 23.33 g of 85% industrial phosphoric acid into 1 L of lithium-containing waste liquid (the lithium content is 4.25 g / l), at a temperature of 70° C. React for 5 hours, filter after the reaction is complete, wash the filter cake and then dry it at 100°C to obtain 22.5g of lithium phosphate finished product. Add lime to the filtrate and washing water to adjust the pH value of the solution to 7 before discharge. The lithium-containing waste liquid of the present embodiment is a by-product mother liquor in the industrial production of lithium sulfate.

Embodiment 2

[0018] The method for producing lithium phosphate from lithium-containing waste liquid in this embodiment specifically includes the following steps: adding 25 g of 85% industrial phosphoric acid into 1 L of lithium-containing waste liquid (lithium content is 4.25 g / l), and reacting at 90° C. for 2 h , filter after the reaction is complete, wash the filter cake and then dry it at 120°C to obtain 23g of lithium phosphate finished product. The filtrate and washing water are added with lime to adjust the pH value of the solution to 8, and then discharged after reaching the standard. The lithium-containing waste liquid in this embodiment is the by-product mother liquor in the industrial production of lithium fluoride.

[0019] Adopt method of the present invention to make lithium phosphate product quality and industry standard YS / T637-2007 contrast as follows:

[0020]

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Abstract

The present invention relates to a method for producing lithium phosphate by using a lithium-containing waste liquid. The method specifically comprises the following steps: adding industrial phosphoric acid to a lithium-containing waste liquid according to a molar ratio of lithium content in the lithium-containing waste liquid to the phosphoric acid of 3:(1-1.05); carrying out a reaction for 1-5 hours at a temperature of 70-90 DEG C; filtering after carrying out the complete reaction; washing the resulting filter cake; and drying to obtain the lithium phosphate finished product. The method of the present invention has the following significant advantages that: with different dissolubilities of the products, the lithium resource in the waste liquid is reasonably converted into the lithium phosphate with a high added value so as to follow a "3R" principle of circular economy and correspondingly save the lithium resource; conversion rate is high, and the lithium resource is completely utilized so as to correspondingly save production cost of the lithium product; the method of the present invention has characteristics of simple process, easy operation, and easy industrial production; and the lithium-containing waste liquid is completely utilized and meets the discharge standard so as to achieve a purpose of cleaning production.

Description

technical field [0001] The invention relates to a method for producing lithium phosphate by utilizing lithium-containing waste liquid, belonging to the field of inorganic materials. Background technique [0002] Lithium contains about 0.0065% in the earth's crust, and its abundance ranks 27th. There are about 260 billion tons of lithium in seawater, and very little lithium exists in humans and animals. In a normal human body weighing 70 kg, the lithium content is 2.2 mg. At present, more than 150 kinds of lithium-containing ores have been found in nature. The main form of lithium in nature is spodumene (LiAlSi 2 o 6 ), lepidolite [Li 2 (F,OH) 2 Al(SiO 3 ) 3 ] and so on, my country's Jiangxi is rich in lepidolite ore. [0003] Lithium can be used as a raw material for the production of lithium compounds, as a strong reducing agent in organic chemistry, as a high-energy battery material, as a deoxidizer and effective scavenger in the metallurgical industry, as an allo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/30
Inventor 侯红军杨华春刘海霞于贺华王建萍薛旭金吴海峰李云峰赵永峰
Owner BAIYIN ZHONGTIAN CHEM
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