HARDENING FOAM MATERIAL CONTAINING COAL ASH, FOR PREVENTING COAL SELF-IGNITION AND PREPARATION METHOD THEREOF Russian patent published in 2016 - IPC C04B38/02 E21F5/00 

FIELD: fire safety.

SUBSTANCE: group of inventions relates to curable foam material containing coal ash, for prevention of self-ignition of coal and its production method. Curable foam material containing coal ash, for preventing coal self-ignition contains, wt%: water 40-60, coal ash 100, powdered composition, which releases gas during chemical reaction, 25-40, accelerator 3-5, activator of 2-4, plasticiser 1-2, stabilising foam composition 1, wherein powdered composition, which releases gas during chemical reaction is obtained with following ratio, wt%: calcium sulphate hemihydrate 24-35 and sodium bicarbonate 1-5, which react with formation of inert gas , i.e. gaseous carbon dioxide to form so foamed lime solution; accelerator is obtained with following ratio, wt%: alumina clinker 1-2, sodium carbonate 1 and burnt lime 1-2, wherein alumina clinker consists of following ingredients, wt%: sodium aluminate 94, aluminium oxide 4, calcium aluminosilicate 2; activator is obtained with following ratio, weight parts: magnesium oxide 0.8-1.6 and magnesium chloride 1.2-2.4; plasticiser is obtained with following ratio, wt%: calcium lignosulphonate 0.5-1 and product of naphthalenesulfonate condensation with formaldehyde and 0.5-1, wherein in product of naphthalenesulfonate condensation and formaldehyde content of Na₂SO₄ is < 3 %; stabilising foam composition is obtained with following ratio, weight parts: butyl ether of ethylene glycol 0.2, nano silicon 0.3 and hydroxyethyl cellulose 0.5; at that time of hardening of said foam material can be adjusted by selecting weight ratios between accelerator, activator and plasticizer. Method of producing curable foam according to claim. 1 includes step 1: addition of 40-60 wt%. water, 0.2 wt%. butyl ether of ethylene glycol, 0.3 wt%. nano silicon and 0.5 wt%. hydroxyethyl cellulose in special vessel for mixing and stirring obtained solution at rate of 3,000±100 rpm by means of mixer for 2 minutes with formation of homogeneous foam solution; step of 2: addition of 100 pts.wt of coal ash, 1-2 WT% of aluminous clinker, 1 wt% sodium carbonate 1-2 weight parts of burnt lime, 0.8-1.6 wt% of magnesium oxide 1.2-2.4 wt% of magnesium chloride, 0.5-1 pts.wt of calcium lignosulphonate and 0.5-1 pts.wt of naphthalenesulfonate condensation product and formaldehyde in mixer for dry mixing, and mixing obtained powder at rate of 3,000±100 rpm for 3 minutes with help of mixer to form mixed powder; stage 3: addition of mixed powder produced in mixer for dry mixing B, in homogeneous foam solution in special vessel for mixing A, and mixture stirring at rate of 12,000±500 rpm for 2 minutes with help of mixer in special mixing container A to form mixed liquid lime solution, holding of mixed liquid lime solution with formation of foam to obtain hardening foam material containing coal ash, for preventing coal self-ignition.

EFFECT: technical result is creation of hardening material with low heat conductivity coefficient, high compression strength, good heat insulating effect, as well as capable of lowering concentration of oxygen in residual space coal.

2 cl, 3 ex