Method for impurity removal and whitening of potassium feldspar

Abstract

The invention discloses a method for impurity removal and whitening of potassium feldspar. Firstly, the potassium feldspar is crushed to particles; then, a ball mill is adopted to grind the potassium feldspar particles to sand powder; the sand powder is magnetically separated by a multi-stage strong magnetic separator after screening; and finally, the hydrothermal acid washing is performed for the magnetically separated potassium feldspar sand powder by sulfuric acid to obtain high-grade and high-whiteness potassium feldspar sand powder. An acid washing purification process is in a closed environment without generating a dust flying problem; the purified potassium feldspar sand powder not only can satisfy the requirements on high-whiteness potassium feldspar sand powder in such industries as glass and ceramics, but also can improve the utilization efficiency of sulfuric acid to a greater extent so as to reduce generation of waste acid; and the method is a green and environment-friendly purifying and whitening production process.

Description

technical field [0001] The invention relates to a beneficiation process, in particular to a method for removing impurities and whitening potassium feldspar. Background technique [0002] Potassium feldspar is an important industrial raw material with a wide range of uses, mainly used in ceramics, glass, enamel and other industries. However, natural potassium feldspar ores usually contain mica, tourmaline, quartz, weakly magnetic iron minerals, and dark-colored minerals such as chlorite and cornstone. Some weathered ores also contain kaolin. These impurities are complex, making potassium feldspar The application in many industrial fields is limited, so it is necessary to select useful minerals by means of physical and chemical treatment, remove impurity components, and reduce the content of harmful elements to achieve the technical indicators of industrial utilization. In industrial applications, there are certain restrictions on the iron content of feldspar raw materials. T...

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Problems solved by technology

Magnetic separation has a good iron removal effect, and the iron content can be reduced to 0.24%, but other impurities are difficult to remove and cannot achieve the whitening effect; the process is simple and easy to process, but there are high processing costs, large energy consumption, Disadvantages such as low profit, low efficiency, and serious air pollution

Flotation has a good impurity removal effect, and the iron content can be reduced to less than 0.2%, but the whiteness cannot be raised to more than 80; the process requires the addition of chemical substances, resulting in high production costs, serious waste of resources, and serious environmental pollution

In recent years, potassium feldspar has also been purified by pickling. Generally, sulfuric acid pickling is used. This method has a good impurity removal effect and a certain whitening effect, but the iron content must be reduced to 0.24%. Below, high-concentration sulfuric acid is required to increase the whiteness to above 80, and the general concentration should reach above 40%. The utilization rate of sulfuric acid is low, and a large amount of waste acid will be produced, resulting in high cost of impurity removal and great impact on the environment.

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