求翻译：但磷石膏制硫酸联产水泥工艺存在工程项目投资大、还原工段能耗高、设备中易结垢堵塞、水泥产品的强度等级较低、质量不稳定、窑气中SO2浓度较低等缺点。是什么意思？

Phosphogypsum production of sulfuric acid and cement technology project investment, high energy consumption reduction section, easy scaling to plug in the device, the lower strength grade cement products, unstable quality, the kiln gas of so2 concentration in lower drawback.

However, phosphate gypsum cement systems sulfuric acid production process, there is project work, restore energy in high-end device, blockage, the strength of the concrete products at a lower quality, stable in air, kiln SO2 concentration is low.

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Phosphogypsum sulfuric acid integrated with cement technology for engineering project investment, restored section of high energy consumption, easily scaling device plugging, unstable lower cement strength grade of product, quality, kiln disadvantages such as lower SO2 concentration in air.

But the phosphorus gypsum system sulfuric acid payment proportional to production cement craft existence engineering project invests, the return to original state construction section energy consumption in a big way high, in the equipment easy scaling jamming, the cement product intensity rank to be