Several ways of titanium white waste acid applied in calcium perphosphate production are introduced. Two-step acid addition is specially proposed.

介绍了钛白废酸在普钙生产中应用的几种形式，提出了两段加酸法的应用思路。

The viscosity increaser of microcrystalline cellulase used in synthetic leather is prepared by using cotton pulp as raw material and waste hydrochloric acid as hydrolyst.

以棉浆为原料，废盐酸为水解催化剂，所得合成革用微晶纤锥素增粘剂的质量指标达到了德国和日本同类产品的标准。