Feldspar grinding plant,feldspar crushing, grinding,separation

 

 

In addition to being used as an industrial raw material (about 50-60% of the total amount), feldspar minerals account for 30% of the ceramic industry, and the rest are used in other industries such as chemicals, abrasives, glass fibers, and welding electrodes. After the feldspar is ground by a mill, it can be used in many ways. The mill used is different, the fineness of the feldspar powder is different, and the aspect used is different.

 

(1) Glass flux: Feldspar is one of the main components of glass mixtures. Feldspar contains high Al2O3, low iron content, and is more fusible than alumina. It not only melts temperature but also increases alkali content to reduce the amount of alkali. In addition, the process of turning the feldspar into glass after being melted is relatively slow, and the crystallization ability is small, which prevents precipitation of crystals during the formation of the glass and damages the product. Feldspar can also be used to adjust the viscosity of the glass. Potassium feldspar or albite is generally used for various glass mixtures.

 

(2) Ceramic green body batching: Before the firing, the feldspar can act as a raw material, reduce the drying shrinkage and deformation of the green body, improve the drying performance and shorten the drying time. At the time of firing, it can be used as a flux to lower the firing temperature, promote the melting of quartz and kaolin, and diffuse and permeate in the liquid phase to accelerate the formation of mullite. The feldspar glass body formed in the molten state is filled between the mullite crystal grains of the green body to make the green body dense and reduce voids, thereby improving mechanical strength and dielectric properties. In addition, the formation of feldspar glass can also improve the light transmittance of the green body. The amount of feldspar incorporated in the ceramic body varies with the raw materials and product requirements.

 

(3) Ceramic glaze: Ceramic glaze is mainly composed of feldspar, quartz and clay raw materials, and the feldspar content can reach 10-35%. In the ceramic industry (blanks and glazes) potassium feldspar is mainly used.

 

(4) Enamel raw materials: mainly mixed with feldspar and other mineral raw materials. The amount of feldspar incorporated is usually 20-30%.

 

(5) Others: Potassium feldspar can be used as raw material for extracting potassium fertilizer

 

 

Alkali feldspar has a high melting point, a long melting time, and a high viscosity of the melt, and a glassy substance formed by melting at a high temperature has a good transparency. Alkali feldspar is used as a raw material for flat glass and various glass products to lower the glass melting temperature. , to save soda ash, it is the main raw material for the production of various ceramics, enamel, electric porcelain billets and glaze. In recent years, with the development of color glass bulbs and ultra-high voltage electric porcelain industry, and the increasing high-grade ceramics for daily use, the demand for high-purity low-ferrite feldspar is increasing, and the high-quality alkali feldspar is limited by good sources. Supply is in short supply. China's alkali feldspar is rich in natural resources, but there are not many high-quality ores. Most ore needs to be removed from iron to meet the quality requirements of industrial production. Therefore, the shale removal and iron removal process is highly valued by enterprises.

 

 

At present, the alkali feldspar beneficiation process mainly has the following types:

 

(1) Alkali feldspar produced by pegmatite: hand selection → crushing → water milling → sorting → finished product

 

(2) Alkali feldspar in weathered granite: crushing-grinding-sorting-flotation (except iron, mica, quartz)

 

Filter press → dry → finished product

 

(3) Alkali feldspar in fine-grained rock: crushing→grinding→sieving→magnetic separation→pressure filtration→drying→finished product

 

(4) Our recommended process: hammer crushing → pendulum grinding → magnetic separation → finished product

 

The wheel mill used in the first process has low grinding efficiency and small processing capacity. In recent years, there are fewer and fewer feldspars, and the product price is also continuously improved. Since there is no iron removal process in the process, the products produced cannot satisfy the ceramics and color. The glass bulb factory requires that the production process is backward, the product quality is not high, and the economic benefits are declining.

 

Although the alkali feldspar produced in the second process can meet the product quality requirements of ceramics and color glass bulbs, the cost of mineral processing is high and the environment is polluted.

The third process is produced by wet method, which can meet the quality requirements of high-grade ceramics and color glass bulbs. The process is complex, requires pressure filtration and drying equipment, and the production cost is high.

 

The fourth process flow: hammer crushing→pendulum milling→magnetic separation process, the process is dry production, large production volume, simple process and low production cost. In the ceramic industry and color glass bulb production industry, due to the fear of iron pollution, grinding mills mostly use wheel mills, gravel mills or porcelain-lined ceramic ball mills as grinding equipment. Although they can avoid iron pollution, their grinding efficiency is low. Long grinding time, low output, high energy consumption; wet rod mill with high grinding efficiency, although improving grinding efficiency, wet production requires concentration equipment, filter press equipment, drying equipment, thus the production cost Greatly improved; the pendulum mill is used to simplify the process and the production cost is much lower, while the mechanical iron mixed by the pendulum mill is removed in the subsequent magnetic separation.

 

 

In the glass ceramic industry, many customers require 80-300 mesh. The feldspar mill of Shanghai Clirik Machinery Co., Ltd is the grinding equipment for this fineness interval. It can directly process ore from large blocks to 80-400 mesh, and the iron content of the product can be less than 0.05%. For high-density powder of 400 mesh or more, our company has HGM and CLUM ultra-fine vertical grinding, which can process materials below 30 cm to 400-2500 mesh, with a screening rate of 97%, iron content less than 0.05%.