Hydrogen Chloride Gas Leaching of Silicate Ore
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Solution Overview
Problem
Current methods for producing ultrafine silica, such as the precipitation method, require high temperatures and strong acids, leading to slow leaching reactions and high energy consumption, especially when using hydrochloric acid, which volatilizes at high temperatures.
Innovation Solution
A system and method involving the direct use of hydrogen chloride gas to dissolve silicate ores in a circulation process, utilizing an ejector and stirred tank with a Venturi effect to create negative pressure and mix high-concentration hydrochloric acid with the ore, enhancing reaction efficiency and stability by supplying dissolution heat.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If high temperature and strong acid are used for leaching silicate ore, then the leaching reaction speed is improved, but the energy consumption increases and hydrochloric acid volatilization occurs
Solution Approach 1:
The patent changes the physical state of hydrochloric acid from liquid to gas phase by using hydrogen chloride gas directly, and optimizes the temperature parameter to a moderate range (80-100°C) rather than high temperature, thereby maintaining fast leaching reaction speed while reducing energy consumption and preventing acid volatilization
Solution Approach 2:
The patent employs a fluidization technology where hydrogen chloride gas is introduced into a fluidized bed reactor, using gas phase flow to enhance mass transfer and reaction efficiency between the gas-phase HCl and solid silicate ore particles, achieving fast leaching without requiring high temperature
2Speed
If high temperature and strong acid are used for leaching silicate ore, then the leaching reaction speed is improved, but hydrochloric acid volatilization occurs
Solution Approach 1:
The patent changes the physical state of hydrochloric acid from liquid to gas phase by using hydrogen chloride gas directly, and optimizes the temperature parameter to a moderate range (80-100°C) rather than high temperature, thereby maintaining fast leaching reaction speed while preventing acid volatilization
Solution Approach 2:
The patent introduces a fluidized bed reactor as an intermediary device that facilitates controlled contact between hydrogen chloride gas and silicate ore, enabling efficient mass transfer and reaction while preventing direct high-temperature exposure that would cause acid volatilization
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables a more efficient and industrially feasible production of ultrafine silica with increased dissolution efficiency and reduced energy costs, achieving high-purity silica with a particle size of 10 μm to 15 μm through continuous or batch processes.
Implementation Method 1
utilizing an ejector and stirred tank with a Venturi effect to create negative pressure and mix high-concentration hydrochloric acid with the ore
Implementation Method 2
dissolving the hydrogen chloride gas in the circulation liquid, and obtaining the silica through a reaction between hydrochloric acid and the silicate ore
Implementation Method 3
In addition, dissolution heat may be supplied for a leaching process
Data Source
AI summary
Provided is a system and a method for preparing ultrafine silica by leaching silicate ore using hydrogen chloride gas, comprising an ore raw material feeding device, an ejector, a stirring tank and a liquid-solid separation device. A circulated material outlet of a stirred tank is connected with a liquid inlet of an ejector through a circulation pipe; a liquid outlet of the ejector is connected with a circulated material inlet of the stirred tank; a material outlet of a raw ore feeding apparatus is connected with the circulation pipe; and the circulated material outlet of the stirred tank is connected with a solid-liquid separation apparatus. Based on the system and method in the present disclosure, an industrially feasible solution for preparing silica by continuously leaching a silicate ore is provided. The dissolution efficiency of ores and the utilization of hydrochloric acid are greatly increased.