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Introduction to the disease:
Before dealing with pollution, we must first determine the type of pollution in order to prescribe the right medicine. Here we provide the following steps to help the industry understand the type and nature of the pollution.
â– Check the type of pollution
First, the stone surface erosion phenomenon: touch the surface of the stone by hand, if it is a rough surface, marble (with CaCO3 as the main component) may be caused by acid erosion; granite (with SiO2 as the main component) may occur alkaline water After the spot, the stone crystal grains are peeled off.
Second, Baihua or crystallization: check whether it is Baihua, some white powder at the joint or stone surface, it is easy to remove by hand.
Third, the stone water spot: the surface of the stone has a deepening phenomenon, check whether it is a water spot, you can first wet the surface of the stone with water, use the widely used test paper, measure its PH value, if it is alkaline (wide test paper is blue), indicating It is a water spot, if not, it may be oil pollution. In the case of alkaline water spot contamination, it is difficult to dry even if the surface is heated by a gas spray gun. If it is caused by general moisture infiltration, it is easy to dry and disappear.
Fourth, the stone surface comprehensive yellowing: comprehensive yellowing is not regional, may be produced after the use of the surface treatment agent yellowing.
Fifth, the local yellowing of the stone surface: local and concentrated, the concentration is shallow, this phenomenon is a few rust yellow.
Observe the color of pollution
Black - tar, tar, fungi, lubricating oil, gasoline, coal ash, black ink, dust, shoe print, shoe polish
Blue - copper rust, blue ink, plant fertilizer
Brown - algae, wood chips, coffee, tea, tobacco, lubricating oil, gasoline, chocolate, urine
Gray - aluminum shavings, white hua
Green - dye, copper rust, green ink, algae
Orange - rust, juice drinks, food
Red - blood, rust, ink, food
White - aluminum shavings, white hua
Yellow - egg yolk, lubricating oil, rust, urine, metamorphic wax
Touch the texture of the stone contaminated area
1. When the contaminated area changes from smooth to rough, there may be a precursor to the erosion of the marble or the flaking of the granite due to long-term alkaline water spots.
Second, the smooth surface of the stone has the touch of flour on the mud, and when the white powder continues to spit out (about 1-2 days after washing, it will spit out), there may be whitening or alkali crystallization.
â– sniffing
Smell the smell of the spot, if it smells like a solvent, it is probably a paint or other chemical solvent.
The above steps are only used as a reference for judging the source of possible contamination and may not be fully applicable to all pollution.
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