A kind of impurity-removing and concentrating method of potassium feldspar

Abstract

The invention discloses a potassium feldspar impurity removing and selecting method, and relates to the technical field of potassium feldspar processing. The method includes the steps: raw ore cleaning; screening; crushing; ore grinding; magnetic separation; select flotation; dewatering. A magnetic separation method includes the steps: finely grinding the magnetically separated ores into fine sandparticles with particle diameter larger than or equal to 200 meshes; adding water to mix mixture to obtain 35-45% ore pulp; adjusting pH (potential of hydrogen) of the ore pulp to reach 1-2; adding chemicals, and stirring mixture until foams are formed; removing the foams in a scraped manner; performing dewatering until the content of water is smaller than or equal to 15% to obtain potassium feldspar. The chemicals account for 3-5% of the weight of the ore pulp and comprise, by weight, 8-11 parts of okra extracts, 5-9 parts of eucalyptus leaf extracts, 1-4 parts of persimmon extracts and 1-3parts of N-lauryl biquaternary ammonium salt which are mixed to form the chemicals. A select flotation method is improved, mica in the potassium feldspar is effectively removed, potassium feldspar powder with high whiteness and less mica is produced, the whiteness of the produced potassium feldspar powder reaches 60 or more, and the used chemicals are free from toxicity and pollution, environmentally friendly and suitable for popularization and use as compared with a traditional select flotation method.

Description

【Technical Field】 [0001] The invention relates to the technical field of potash feldspar processing, and specifically relates to a method for removing impurities from potash feldspar. 【Background technique】 [0002] Potash feldspar is a kind of feldspar, a common feldspar mineral, and sodium aluminosilicate. Potash feldspar is generally a glass-like crystal, which is one of the main raw materials for the manufacture of glass and ceramics. [0003] In recent years, with the rapid development of my country's ceramic industry and glass industry, the demand for high-purity potassium feldspar has been increasing. Iron and mica are the main impurities in potash feldspar ore, which affect the whiteness, dielectric properties and chemical stability of ceramics. At present, the research on the removal of impurities in feldspar ore mainly focuses on removing iron impurities. There is less research on mica, and the content of mica in mineral rocks is low, but it has a greater impact on the ...

AI Technical Summary

Problems solved by technology

Iron and mica are the main impurities of potassium feldspar ore, which affect the whiteness, dielectric properties, and chemical stability of ceramics. At present, the research on the removal of impurities from feldspar ore mainly focuses on removing the iron impurities in it. For the removal of mica whitening There are few researches, and the content of mica in mineral rocks is low, but it has a great influence on the whiteness and quality of feldspar ore, and mica is a silicate mineral with layered structure, acid and alkali resistance, and stable chemical properties. hard to remove

At present, mica removal methods are mainly as follows: under certain conditions, mineral dressing agents are used to capture mica and separate it from feldspar. Commonly used floating agents are chemical agents such as surfactants and ionic collectors. Most of the agents are Toxic substance, large amount of use and discharge will pollute the environment

For example, Chinese patent 201710843849.9 discloses a production and preparation method of potassium feldspar powder. Impurities are removed through a series of physical methods such as raw ore cleaning, screening, crushing, grinding, magnetic separation and dehydration to obtain potassium with less iron and high whiteness. Feldspar, but failed to remove mica, and the purity is not high; such as the literature "Research on the Whitening of Mica in Feldspar Mine", Pan Dawei et al., "Chinese Ceramics", 2015 (1): 54-57, the research believes that the mass ratio is adopted The mixture of dodecylamine and octadecylamine of 2:1 is used as a flotation agent to remove mica in feldspar ore, but dodecylamine is a toxic agent, and a large amount of use and discharge will pollute the environment. Therefore, the application is based on The above-mentioned published documents improve the preparation and impurity removal methods of potassium feldspar