A process of mechanical activation to improve boron leaching rate of boron concentrate

Abstract

The invention belongs to the field of boron ore resource utilization, and particularly relates to a mechanical activation process for improving the boron leaching rate of boron concentrate. In the present invention, the boron concentrate is first mechanically crushed and used as raw material for later use. The crushed boron concentrate raw material is placed in a high-energy ball mill for mechanical activation. The mass ratio of the grinding ball to the boron concentrate raw material is (4~16):1. The diameter of the grinding ball is 3~10mm, the filling rate of the grinding ball and boron concentrate in the ball mill tank is 30%~70%, the ball milling speed is 100~300r / min, the ball milling time is 10~120min, and the mechanically activated boron concentrate is obtained , and finally stir and heat the mechanically activated boron concentrate with sodium hydroxide solution to obtain boron-containing leach liquid and leaching residue. The boron leaching rate reaches more than 73.1%. The present invention applies the method of combining mechanical activation and alkali leaching to strengthen the leaching of boron in boron concentrate, which is a simple, safe, economical, environmentally friendly and efficient new process. This new process can improve the activity of boron concentrate, Therefore, it is expected to obtain higher boron leaching rate at lower alkalinity and temperature.

Description

technical field [0001] The invention belongs to the field of utilization of boron ore resources, and in particular relates to a process for improving the boron leaching rate of boron concentrate through mechanical activation. Background technique [0002] Although my country is rich in boron resources, the recoverable boronite ore reserves in the existing boron mines are limited and will soon be exhausted. The output is far from meeting the needs of the boron industry, and the contradiction between supply and demand is very prominent. The use of low-grade boron ore resources has become an inevitable trend, but low-grade boron ore cannot meet the requirements of industrial production. Boron iron ore is separated by magnetic gravity separation to separate boron-containing iron concentrate and boron concentrate. The boron content in boron concentrate is relatively high, but the grade is still low. The leaching rate is only about 65%, the efficiency is too low, and the mineral ...

AI Technical Summary

Problems solved by technology

[0003] The boron leaching process of low-grade boron ore resources studied at the present stage mainly uses roasting as a pretreatment method. After roasting, the activity is improved, which can basically meet the current needs of boron industrial production, but the utilization rate is still low and the roasting process faces polluted gases. emission problem

At present, the carbon-soda method is mostly used in industry, but there are still many unavoidable shortcomings in this process: (1) The roasting process not only causes waste of resources, but also produces greenhouse gases and polluting waste gases, which affects air quality

(2) The raw material gas CO used in carbonization 2 The content is only 30%, so that the total carbonization time is as long as 18~23h, and the boron yield is low, resulting in waste of equipment, energy and resources

Although mechanical activation has been successfully applied to enhance the leaching of useful elements in some minerals, due to the differences in the physical and chemical properties of different minerals, the specific mechanical activation methods for different minerals are different, and the connection between mechanical activation and leaching is also different, and No reported methods for mechanical activation of boron concentrates to enhance the leaching process of boron

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