Building board

Abstract

The invention relates to A building board comprising a base course and a surface course, wherein the surface course is combined at the outer surface of the base course, wherein the base course made from a composition which comprises raw materials of light burning magnesium powder, magnesium chloride solution, mineral powder originated from city refuse, glass fiber, shale and hydrochloric acid, the surface course made from a composition which comprises raw materials of light burning magnesium powder, magnesium chloride solution, quartz powder and hydrochloric acid. The invention changes part of materials in city refuse into useful resource so as to protect the environment and increase the economic benefit.

1 . A building board comprising a base course and a surface course, wherein the surface course is combined at an outer surface of the base course, wherein the base course is made from a composition which comprises light burning magnesium powder, magnesium chloride solution, mineral powder originated from city refuse, glass fiber, shale and hydrochloric acid, and wherein the surface course is made from a composition which comprises light burning magnesium powder, magnesium chloride solution, quartz powder and hydrochloric acid. 
     
     
         2 . The building board of  claim 1 , wherein the composition of the base course comprises 200 parts of the light burning magnesium powder, 40 to 75 parts of the magnesium chloride solution, the magnesium chloride solution being 28 to 32 Baume degrees, 1 to 2 parts of the hydrochloric acid, the hydrochloric acid having a concentration of 36 to 38%, 80 to 120 parts of the mineral powder originated from the city refuse, 20 to 30 parts of the glass fiber, and 50 to 80 parts of the shale. 
     
     
         3 . The building board of  claim 1 , wherein the composition of the surface course comprises 200 parts of the light burning magnesium powder, 40 to 75 parts of the magnesium chloride solution, the magnesium chloride solution being 28 to 32 Baume degrees, 1 to 2 parts of the hydrochloric acid, the hydrochloric acid having a concentration of 36 to 38%, and 50 to 100 parts of the quartz powder. 
     
     
         4 . The building board of  claim 2 , wherein the composition of the surface course comprises 200 parts of the light burning magnesium powder, 40 to 75 parts of the magnesium chloride solution, the magnesium chloride solution being 28 to 32 Baume degrees, 1 to 2 parts of the hydrochloric acid, the hydrochloric acid having a concentration of 36 to 38%, and 50 to 100 parts of the quartz powder. 
     
     
         5 . The building board of  claim 4 , wherein the light burning magnesium powder is of a content of over 85%, and wherein the magnesium chloride solution is prepared by saltless hexahydrated magnesium or anhydrous magnesium chloride. 
     
     
         6 . The building board of  claim 5 , wherein a fineness of quartz powder is over 240 meshes, a size of mineral powder originated from the city refuse is not larger than 1 mm, an average length of the glass fiber is 2 to 5 mm, and an average size of the shale is 0.5 to 2 mm. 
     
     
         7 . The building board of  claim 6 , wherein the compositions of the surface course and the base course further include lauxite, trisodium phosphate, methylnaphthalene sodium dithionite, calcium oxide, polyvinyl acetate and/or ferrous sulfate. 
     
     
         8 . The building board of  claim 7 , wherein an amount of the lauxite is 0 to 2 parts, an amount of the trisodium phosphate is 0 to 0.8 parts, an amount of the methylnaphthalene sodium dithionite is 0 to 0.8 parts, an amount of the calcium oxide is 0 to 1.2 parts, an amount of the polyvinyl acetate is 0 to 0.5 parts, and an amount of the ferrous sulfate is 0 to 1. 2 parts. 
     
     
         9 . The building board of  claim 8 , wherein the mineral powder originated from city refuse is made by a process including primary crushing, separation and secondary crushing, wherein mineral materials are separated from crushed city refuse in the separation step and then crushed into fine particles or powder in the secondary crushing step, forming the mineral powder originated from city refuse. 
     
     
         10 . The building board of  claim 9 , wherein the primary crushing includes a first step using a jaw crusher to crushes large blocks into small blocks, and a second step using a roll crusher to crush small blocks to small particles. 
     
     
         11 . The building board of  claim 1 , wherein the compositions of the surface course and the base course further include lauxite, trisodium phosphate, methylnaphthalene sodium dithionite, calcium oxide, polyvinyl acetate and/or ferrous sulfate. 
     
     
         12 . The building board of  claim 2 , wherein the compositions of the surface course and the base course further include lauxite, trisodium phosphate, methylnaphthalene sodium dithionite, calcium oxide, polyvinyl acetate and/or ferrous sulfate. 
     
     
         13 . The building board of  claim 3 , wherein the compositions of the surface course and the base course further include lauxite, trisodium phosphate, methylnaphthalene sodium dithionite, calcium oxide, polyvinyl acetate and/or ferrous sulfate. 
     
     
         14 . The building board of  claim 1 , wherein the mineral powder originated from city refuse is made by a process including primary crushing, separation and secondary crushing, wherein mineral materials are separated from crushed city refuse in the separation step and then crushed into fine particles or powder in the secondary crushing step, forming the mineral powder originated from city refuse. 
     
     
         15 . The building board of  claim 2 , wherein the mineral powder originated from city refuse is made by a process including primary crushing, separation and secondary crushing, wherein mineral materials are separated from crushed city refuse in the separation step and then crushed into fine particles or powder in the secondary crushing step, forming the mineral powder originated from city refuse. 
     
     
         16 . The building board of  claim 3 , wherein the mineral powder originated from city refuse is made by a process including primary crushing, separation and secondary crushing, wherein mineral materials are separated from crushed city refuse in the separation step and then crushed into fine particles or powder in the secondary crushing step, forming the mineral powder originated from city refuse. 
     
     
         17 . The building board of  claim 4 , wherein the mineral powder originated from city refuse is made by a process including primary crushing, separation and secondary crushing, wherein mineral materials are separated from crushed city refuse in the separation step and then crushed into fine particles or powder in the secondary crushing step, forming the mineral powder originated from city refuse. 
     
     
         18 . The building board of  claim 5 , wherein the mineral powder originated from city refuse is made by a process including primary crushing, separation and secondary crushing, wherein mineral materials are separated from crushed city refuse in the separation step and then crushed into fine particles or powder in the secondary crushing step, forming the mineral powder originated from city refuse. 
     
     
         19 . The building board of  claim 6 , wherein the mineral powder originated from city refuse is made by a process including primary crushing, separation and secondary crushing, wherein mineral materials are separated from crushed city refuse in the separation step and then crushed into fine particles or powder in the secondary crushing step, forming the mineral powder originated from city refuse. 
     
     
         20 . The building board of  claim 7 , wherein the mineral powder originated from city refuse is made by a process including primary crushing, separation and secondary crushing, wherein mineral materials are separated from crushed city refuse in the separation step and then crushed into fine particles or powder in the secondary crushing step, forming the mineral powder originated from city refuse.