Binder for magnesia-calcium brick, production method of magnesia-calcium brick, and magnesia-calcium brick

The invention relates to a binder for a magnesia-calcium brick, a production method of the magnesia-calcium brick, and the magnesia-calcium brick. The binder is obtained by adding edible soybean oil to 56-60 DEG C semi-refined paraffin wax. The production method comprises the following steps: 1, screening 20 calcium synthetic sands to form particles with the granularity being 5-3 mm, 3-1 mm and 1-0 mm respectively and fine powder with the granularity being 0.074 mm or less; 2, proportioning above raw materials and a binder by weight: preparing 100-120 parts by weight of the particles and the fine powder and 2.5-3 parts by weight of a binder; 3, mixing the raw materials in step 2 with the binder: performing dry mixing on the particles, adding the binder, adding the fine powder with the granularity of 0.074 mm or less, and performing mixing to obtain a paste; 4, forming a green brick by using a hydraulic machine, and adding the green brick into a green brick kiln vehicle; 5, sintering the green brick in the kil