Method for preparing nano calcium zincate from zinc-containing raw ores

Abstract

The invention relates to a method for preparing nano calcium zincate from zinc-containing raw ores. The method comprises the steps of digestion, optional purification, carbon removal, calcium zincatesynthesis, optional rinsing and drying. The method combines wet-process leaching and the synthesis technology, ultralow grade zinc ore economical and environment-friendly utilization can be achieved,the application range is wide, no ammonia distillation is needed, the method is easy and convenient to implement, the energy consumption of the technology is greatly lowered, water treatment pressurecaused by ammonia distillation, high-temperature and high-pressure potential safety hazards, equipment corrosion and other problems are further avoided, the environment-friendly problem that the balance of process water is affected due to the fact that steam is brought into remaining water in the ammonia circulation technology is solved, the purposes of high technology recycling rate and high quality good level are achieved, contaminations are low, auxiliary materials can be recycled, and synthesis of nano calcium zincate under the zinc ammonia environment is achieved for the first time.

Description

technical field [0001] The invention belongs to the technical field of inorganic chemical industry, relates to resource utilization of low-grade zinc-containing raw ore, in particular to a method for producing nanometer calcium zincate by using low-grade zinc oxide raw ore. Background technique [0002] The production and consumption of zinc in my country ranks first in the world. Domestic zinc resources cannot meet the production requirements, and a large amount of zinc raw materials need to be imported every year. my country is a country rich in zinc oxide resources. The reserves of zinc metal in zinc oxide ore in my country are about 28 million tons, accounting for about 27.7% of the zinc metal reserves in zinc oxide ore in the world. Zinc oxide mines in my country generally have a low zinc grade, with an average grade of less than 5%. At present, the stagnant ore and lean ore reserves that cannot be economically utilized account for the vast majority, among which the min...

AI Technical Summary

Problems solved by technology

In the above method, the finished high-purity zinc oxide or finished zinc salt needs to be used as the starting raw material, the raw material is expensive, and the reaction conditions are harsh, the energy consumption is high, the reaction is incomplete, the yield is low, the reaction specificity is poor, and it is easily interfered by impurities. The process is expensive and not suitable for industrial application