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苏联顿涅茨国家工业企业公共建筑和卫生工程研究设计院对用化学工业废料硫酸盐废渣作为制作陶粒的膨胀掺料进行了研究。一种有脆性并易于溶解于水的块状材料——硫酸盐废渣是通过对化学生产废物芳香化合物硝化作用的污水进行热处理获得的。这种硫酸盐废渣含有下列成分(质量%):Na_2SO_476—85;Na_2S_4—8;Na_2CO_3 3—
Soviet Union Donetz National Industrial Enterprise Public Building and Sanitary Engineering Research and Design Institute studied the use of sulfate waste from the chemical industry as an intumescent additive for making ceramic particles. A blocky material that is brittle and easily soluble in water—sulfate slag is obtained by heat-treating effluent from the nitration of chemically produced waste aromatic compounds. This sulfate residue contains the following components (mass %): Na_2SO_476_85; Na_2S_4_8; Na_2CO_3 3—