机械密封：采用WB2型、ST型不用冷却水可调式端面密封技术，由碳化硅，高纯度氧化铝陶瓷、填充四氟，石墨等材料制成。
Mechanical seal: use of WB2 and st non-water-cooled adjustable end face sealing technology, composed of silicon carbide, high purity alumina ceramic, packing PTFE and graphite etc.
指出了用各种方法制得的氧化铝粉末的粒径、晶型和纯度，并比较了各类方法的优缺点。
The particle size, crystal phase and purity quotient of alumina powder prepared by different kinds of methods are suggested. Their advantages and disadvantages are also compared.
以工业氢氧化铝和硫酸为原料，采用两步纯化溶液法制得了纯度为99.99%的氢氧化铝粉。
Aluminium hydroxide with 99.99% of purity was obtained by two-step purifying aluminium sulfate solution made from aluminium hydroxide and sulfuric acid with industry purity.
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