A process of increasing the boron leaching rate of a boron concentrate through mechanical activation

Abstract

The invention belongs to the field of boron ore resource utilization, and particularly relates to a process of increasing the boron leaching rate of a boron concentrate through mechanical activation. The process includes firstly mechanically crushing the boron concentrate, keeping the crushed boron concentrate as a raw material for later use, adding the crushed boron concentrate raw material into a high-energy ball mill, performing mechanical activation to obtain a mechanically activated boron concentrate with the mass ratio of grinding balls to the boron concentrate raw material being (4-16):1, the diameter of the grinding balls being 3-10 mm, the filing ratio of the grinding balls and the boron concentrate in a ball milling tank is 30-70%, a ball milling rotary speed being 100-300 r / min and ball milling time being 10-120 min, stirring with a sodium hydroxide solution, heating the mixture, and leaching the mechanically activated boron concentrate to obtain a boron-containing leachate and leaching slag. The boron leaching rate is 73.1% or above. The process in which mechanical activation and alkali soaking are combined for enhancing boron leaching from the boron concentrate is a simple, safe, economical, environment friendly, efficient and novel process. The process can improve activity of the boron concentrate, and therefore the high boron leaching rate at a low alkalinity and temperature is expected to be acquired.

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 ...

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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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