Ever since the research institute developed the formula of lu celadon and lu jade porcelain with potassium feldspar instead of porcelain stone, feldspar (feldspar is light in weight, and its crystalline surface is easy to be stressed and broken, so it is not convenient to be processed into stone products) began to enter the horizon of ceramic people.But now, the industry's demand for feldspar may be said to have reached a fantastic height.
Feldspar variety, on the pure theory of feldspar, there are potassium feldspar, sodium feldspar, calcium feldspar, barium feldspar four kinds.Because feldspar often potassium and sodium symbiosis, which through feldspar, orthoclase, plagioclase, pull feldspar and other categories.Due to the author's limited level, this paper can not be classified about feldspar one by one.
Theoretical potassium feldspar: K2O·Al2O3·6SiO2.Among them, potassium content is 16.9%, aluminum content is 18.4% and silicon content is 64.7%.See this data, do glaze friends estimate the heart will stomach fei, in the production can use potassium content 12 points, potassium and sodium content of more than 14 points on the feldspar is very good, 16.9% potassium content, basically did not have how to meet.
Potassium feldspar is often associated with quartz and sodium feldspar.Data on potassium 10 sodium 1 and potassium 6 sodium 3 have been tested on the same vein.In a large potassium feldspar mine in zhuzhou, the data of potassium 13 sodium 2 and potassium 8 sodium 1 have been tested.This to the mine exploitation, has caused the considerable disturbance.Two sets of data, the former can sell for hundreds of dollars, while the latter is much cheaper.Painfully, fluctuations in data can make buyers more reluctant to bid on the quality of the overall vein.
In guangxi and shangrao, jiangxi, there are large wind sand.The wind-blown sand in guangxi is about the weathered potassium sand within 5 points, the weathered potassium sand within 16 points of aluminum, and the weathered potassium sand in shangrao is unknown.Interestingly, this weathered potassium sand is screened in a sand field. The large grains are feldspar with potassium content up to 12 points, while the fine sand under the screen can be directly used for building sand.In the weathering process of granite, the hardness of potash feldspar is generally higher than that of quartz. In the weathering process, potash feldspar is more likely to be broken up and run away with the water. This is the reason why we detected 2 and 3 points of potassium in weathered gaoling mine, but detected higher points of potassium in the rocks below weathered gaoling mine.This situation is the opposite of the potassium sand in guangxi and shangrao.Nature can sometimes surprise.
In the ceramic industry with feldspar, calcium content is generally required.Because calcium often means the ore contains calcium carbonate, which can cause bubbles to form.In the local production process, the air pollution problem, farmers next door to the rice orchards appeared yellow leaf fruit phenomenon.Then came the confrontation between farmers and factories.Later, after a lot of tests, it was found that the calcium in the local feldspar was in the form of CaF2. After the product was heated, F escaped, leading to the contamination of surrounding agricultural products.Nature can sometimes surprise.
Generally speaking, the whiteness of feldspar depends on the content of iron and titanium.But sometimes, if we're dealing with rare minerals, it's not just about iron and titanium.The typical tantalum niobium ore.Tantalum - niobium ore is an excellent potassium - sodium feldspar.But before extraction, it affects whiteness.Guote equipment company has tested iron content of 0.08, titanium content of 0.01, potassium 13, aluminum 19, whiteness is only 53 degrees of white potassium feldspar, and in a factory in qingyuan, guangdong province, the similar data products, whiteness reached more than 65.In the detection of feldspar, it is necessary to pay attention to the similar metal content.Although the content is low, the effect of dialogue is significant.Naturally occurring minerals often produce many different results as natural conditions and time erode.When we adopt these minerals, we should also adjust measures to local conditions, according to the specific situation to do, reasonable and economical use of these gifts of nature.