It is a kind of to utilize SO2The method of gas-selectively leaching boron magnesium ore
阅读说明：本技术 一种利用so2气体选择性浸出硼镁矿的方法 (It is a kind of to utilize SO2The method of gas-selectively leaching boron magnesium ore ) 是由 史培阳 刘宇哲 张孜屹 宁俊翔 刘承军 姜茂发 于 2019-08-06 设计创作，主要内容包括：本发明提供了一种利用SO_2气体选择性浸出硼镁矿的方法,即利用SO_2气体作为浸出剂浸出硼镁矿,属于湿法冶金领域。该方法将硼镁矿研磨后置于反应设备中,液固比为3～8:1,通入SO_2气体,在25～90℃、10～500r/min的搅拌速率下反应10～300min,然后固液分离得到含硼溶液。本发明不仅硼浸出率高,而且镁浸出率低。本发明借助SO_2气体对矿物侵蚀能力较弱的特性,利用SO_2气体仅分解硼镁矿中的硼镁石相和菱镁矿相,不仅显著降低了硼镁矿的酸耗量,且有利于浸出尾渣的资源化利用,还有利于提高硼酸的收率和硼酸的产品质量；对于硼镁矿的资源化综合利用意义重大。(SO is utilized the present invention provides a kind of 2 The method that gas-selectively leaches boron magnesium ore utilizes SO 2 Gas leaches boron magnesium ore as leaching agent, belongs to field of hydrometallurgy.Boron magnesium ore grinding is placed in consersion unit by this method, and liquid-solid ratio is 3~8:1, is passed through SO 2 Gas reacts 10~300min under 25~90 DEG C, the stirring rate of 10~500r/min, is then separated by solid-liquid separation and obtains boron-containing solution.Not only boron leaching rate is high by the present invention, but also magnesium leaching rate is low.The present invention is by SO 2 The gas characteristic weaker to mineral erosiveness, utilizes SO 2 Gas only decomposes boromagnesite phase and magnesite phase in boron magnesium ore, not only significantly reduces the sour consumption of boron magnesium ore, and be conducive to the resource utilization of leached tailings, also advantageously improves the yield of boric acid and the product quality of boric acid；It is significant for the comprehensive utilization of resources of boron magnesium ore.)
1. a kind of utilize SO2The method of gas-selectively leaching boron magnesium ore, which is characterized in that this method comprises the following steps:
(1) boron magnesium ore crushing grinding is placed in consersion unit, liquid-solid ratio is 3~8:1；It is passed through SO2Gas, 25~90 DEG C, 10~300min is reacted under constant stirring rate；
(2) it is separated by solid-liquid separation after reaction, obtains boron-containing solution.
2. it is according to claim 1 it is a kind of utilize SO2The method of gas-selectively leaching boron magnesium ore, which is characterized in that boron magnesium Content of MgO is 20%~60%, B in mine2O3Content is 5%~30%.
3. it is according to claim 1 or 2 it is a kind of utilize SO2The method of gas-selectively leaching boron magnesium ore, which is characterized in that Boron magnesium ore granularity in step (1) after grinding is 10~250 μm.
4. it is according to claim 1 or 2 it is a kind of utilize SO2The method of gas-selectively leaching boron magnesium ore, which is characterized in that In step (1), SO2Gas flow is 1~80mL/min.
5. it is according to claim 3 it is a kind of utilize SO2The method of gas-selectively leaching boron magnesium ore, which is characterized in that step (1) in, SO2Gas flow is 1~80mL/min.
6. according to claim 1, a kind of described in 2 or 5 utilize SO2The method that gas-selectively leaches boron magnesium ore, feature exist In in step (1), stirring rate is 10~500r/min.
7. it is according to claim 3 it is a kind of utilize SO2The method of gas-selectively leaching boron magnesium ore, which is characterized in that step (1) in, stirring rate is 10~500r/min.
8. it is according to claim 4 it is a kind of utilize SO2The method of gas-selectively leaching boron magnesium ore, which is characterized in that step (1) in, stirring rate is 10~500r/min.
Technical field
The invention belongs to field of hydrometallurgy, and in particular to a kind of to utilize SO2The method of gas-selectively leaching boron magnesium ore.
Background technique
The explored boron resource reserves in China are about 7575.69 ten thousand tons, account for about the 8% of world's gross reserves, occupy the world Five.From gross reserves, China's boron resource is compared with horn of plenty, but boron rock grade is (with B2O3% is counted) account for about me lower than 11% The 83.2% of state's boron rock total amount belongs to boromagnesite type boron resource more.When using traditional method for extracting boric acid, not only sulfuric acid disappears Consumption is big, and a large amount of soluble magnesium salt enters in solution, seriously affects the product quality of boric acid yield and boric acid, causes Keep enterprise's cost when using domestic boron magnesium ore production boric acid high, environmental pollution is serious, cause China's boron industry with External product is in a disadvantageous position when competing.It would therefore be highly desirable to develop boron magnesium ore leaching novel technique.
As China's boron product consumption amount increases year by year, it is contemplated that be up to 970,000 tons in aggregate consumption in 2022.Boric acid is made For important basic industries raw material, it is widely used in glass ceramics, steel, medicine and nuclear power field.But it is limited to boron rock grade With the limitation of production method, boron chemical industry used raw material 90% in China's relies on import, and external dependence degree is high, and risk is big, no Conducive to the sound development of China's boron industry.
Chinese patent (CN102887525) is raw material after sulfuric acid is acidified filters pressing using Qinghai Area boron magnesium ore, and mother liquor is steamed Hair, flotation obtains sulfuric acid magnesium products after adjusting pH.Chinese patent (CN105480987) strengthens boron magnesium ore acid using ultrasonic wave added Solution, and surfactant is added into mother liquor and prepares basic magnesium carbonate, boric acid is prepared after except iron.Although these methods are certain The environmental pollution phenomenon in boric acid production process is reduced in degree, but does not change boron magnesium ore Production By Sulfuric Acid Process process fundamentally Present in root problem, essence variation, the yield of boric acid and production do not occur for the ratio of boric acid and magnesium sulfate in ie in solution Quality is still influenced by magnesium sulfate concentration in solution is excessively high.Novelty of the invention, which is embodied in, proposes a kind of friendly choosing Selecting property leaches boron magnesium ore technique, there is difference substantially with traditional boron magnesium ore sulfuric acid process extract technology.
Summary of the invention
To solve problems of the prior art, the present invention proposes a kind of using SO2Gas-selectively leaches boron magnesium ore Method, it is intended to do not influence the leaching rate on the basis of boron leaching rate, reducing magnesium elements in boron magnesium ore, can not only weaken solution The influence of middle Magnesium Sulfate on Boron acid yield and product quality, can also reduce sour consumption.
The technical solution of the present invention is as follows:
It is a kind of to utilize SO2The method that gas-selectively leaches boron magnesium ore, this method include the following steps:
(1) boron magnesium ore grinding is placed in consersion unit, is passed through SO according to the liquid-solid ratio of 3~8:12Gas, constant It is reacted under stirring rate；Wherein, reaction temperature is 25~90 DEG C；Reaction time is 10~300min.
(2) it is separated by solid-liquid separation after reaction, obtains boron-containing solution.
In the step (1), B in boron magnesium ore2O3Content is 5%~30%, content of MgO is 20%~60%；After grinding Boron magnesium ore granularity is 10~250 μm；SO2The flow of gas is 1~80mL/min；Stirring rate is 10~500r/min.
Beneficial effects of the present invention: traditional sulfuric acid process leaches in boron magnesium ore technique, and boron leaching rate is about 90%, magnesium leaching rate Reach 80% or more.The present invention utilizes SO2Gas-selectively leaches boron magnesium ore, boron leaching rate height (B2O3Leaching rate >=90%), magnesium Leaching rate is low (MgO leaching rate≤40%)；Present invention significantly reduces consumption sour in boron magnesium ore leaching process, per kilogram boron magnesium ores It reduces the about 0.46kg concentrated sulfuric acid (mass fraction 98%), magnesium sulfate reduces 0.55kg in solution, thus significantly reduces in solution The content of magnesium sulfate improves boric acid and magnesium sulfate separating difficulty, improves the yield of boric acid product quality and boric acid；It is simultaneously Hydrometallurgy mineral extraction process provides a kind of approach.
Detailed description of the invention
Fig. 1 is that the present invention utilizes SO2The process flow chart of gas-selectively leaching boron magnesium ore.
Specific embodiment
A specific embodiment of the invention is described in detail below in conjunction with technical solution and attached drawing.