求翻译：以磷石膏为原料与天然石膏为原料制硫酸铵的差别在于，流程前端设置了磷石膏调浆和过滤洗涤工序，使磷石膏得以净化。是什么意思？

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As a raw material in phosphor gypsum plaster and natural to produce sulfuric acid ammonium, and the process is the difference between front-end set the phosphor gypsum and pulp washing and filtering processes, the phosphor gypsum to be purified.

Lies in take the phosphorus gypsum as raw material and the natural gypsum for raw material system ammonium sulfate difference, front end the flow has established the phosphorus gypsum mix mud or slurry and the filtration lavation working procedure, enables the phosphorus gypsum to purify.

Using phosphorus gypsum as raw material and natural gypsum as raw material difference between ammonium sulfate, process front-end set of pulp-mixing phosphogypsum and filter washing process of phosphogypsum purification.

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