1. What causes the alkali return of marble?
1. What causes the alkali return of marble? The reason why marble returns to alkali is that there is enough pressure and water vapor at the bottom of marble, and saline-alkali powders such as calcium carbonate, calcium hydroxide, sodium carbonate and magnesium carbonate precipitate from the inside of marble to the surface through the cracks in marble lines. On the marble surface, after the water stains dry, these powders become white crystals, which is what we call alkali return in this paper.
2. The process of returning marble to alkali will corrode the crystal plane of stone, leading to the fading of stone. After a long time, it will continue to corrode the stone surface, causing the stone to peel off.
Solve the problem of marble returning to alkali;
First of all, we should start with the stone installation project, do a good job of waterproofing, control the drying of the lower base surface of the stone, and prevent the underground pipeline from leaking. In addition, marble should be well maintained and some auxiliary products should be used to change the resistance of stone.
Second, the marble alkali treatment process
1. First of all, the slight alkali reaction can be washed with water, and the water should be drained quickly after washing to let the water take away the alkaline substances.
2. If there is no good effect, dilute the acidic detergent with water, and then wipe off the alkaline substances on the marble with a mop or rag.
3. You can also use mirabilite (sodium sulfate), barium sulfate, barium sulfide and other solutions to find some towels that are not soaked and then wipe the marble.
4. Don't forget to dry the water after the above steps are completed, and keep the windows ventilated and dry, which can accelerate the moisture, and there will be no alkali prevention in the future.
5. If it is particularly serious marble alkali, it may cause problems in the stone itself and construction, and it is necessary to bother to grind off the crystal plane on the marble surface.
6. Wipe off the crystal face of the marble and brush a layer of branches (a thin layer of 2 mm is enough), so that the marble can be kept dry and form a protective film to prevent the phenomenon of anti-alkali of marble in the future.
Third, is it useful to return marble to alkali polishing?
Alkaline polishing of marble is useful. Therefore, we still polish marble with alkali polishing. The specific steps are as follows:
1, and then dry grinding with 300# or 500# water mill (dry grinding with 2# and 3# is also acceptable).
2. Clean up the dust.
3. Leave it on the ground to dry for 3-5 days (the specific inspection method can be adhered to the ground with adhesive tape with A4, and check whether A4 is wet or dry the next day).
4. After the ground is dried, apply organic fluorine-based protective agent and keep it healthy for more than 24 hours.
5. Dry-grind 4#, 5# or 500#, 1000# and 3000# Shi Mei dry-grinding tablets in turn.
6. Vacuum the dust and clean the ground.
7. Dilute the dry ground with grindstone powder and water at the ratio of 2: 1 to ensure that the ground is dry and shiny.
After 8, 2-3 hours, the crystal surface was treated with MS- 120 all-around polishing paste. In order to obtain excellent gloss effect, MS- 120 Universal polishing paste can be reused for 2-3 times, and the dosage should not be too much each time.
The above is about the reason of marble returning to alkali, the treatment process of marble returning to alkali, and whether marble returning to alkali polishing is useful. I hope I can help you!