生产工艺先进，对环境无污染。
Advanced production process with no pollution for the environment.
干法制备具有生产成本低，产品性能优良，对环境无污染等优点。
Dry preparation has many advantages such as low cost, excellent product property, no pollution to environment, etc.
本工艺流程简单，操作方便，试剂用量少，产品成本低，对环境无污染。
The flowsheet is simple and convenient to operate, with fewer reagent consumption, lower production cost and no pollution.
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