Process for treating waste sludge from combustion plant desulfurization
units and cementitious product of the process
    11.
    发明授权
    Process for treating waste sludge from combustion plant desulfurization units and cementitious product of the process 失效
    用于处理来自燃烧厂脱硫装置的废泥的方法和该方法的水泥制品

    公开(公告)号:US4108677A

    公开(公告)日:1978-08-22

    申请号:US744510

    申请日:1976-11-24

    申请人: Richard E. Valiga

    发明人: Richard E. Valiga

    IPC分类号: C04B18/06 C04B28/14 C04B11/00

    摘要: Aqueous alkaline desulfurization treating units for combustion gases generate as a product an aqueous sludge containing sulfur compounds of calcium. Many such sludge products contain more than 30 percent by weight (of the solids) of calcium sulfite hemihydrate. These waste products are in part calcined at a temperature from 250.degree.C to 650.degree.C to produce a moisture-free, cementitious product which is thereafter recombined with uncalcined aqueous sludge to produce a cementitious product which can be profitably utilized or which may be conveniently discarded as a landfill. If desired, fly ash or bottom ash produced in the combustion process can be combined with the cementitious product.

    摘要翻译: 用于燃烧气体的碱性脱硫处理装置产生含有硫化合物钙的含水污泥。 许多这样的污泥产品含有超过30重量%(固体)的亚硫酸钙半水合物。 这些废弃产品部分在250℃至650℃的温度下煅烧,以产生无水分的水泥质产物,然后与未煅烧的含水污泥重新混合,以生产可以有利地利用或可方便使用的水泥产品 作为垃圾填埋场弃置。 如果需要,在燃烧过程中产生的飞灰或底灰可以与水泥质产物组合。

    Process for improving the fluidity and conveyability of moist calcium
sulfate precipitates
    20.
    发明授权
    Process for improving the fluidity and conveyability of moist calcium sulfate precipitates 失效
    改善湿硫酸钙沉淀物的流动性和输送性的方法

    公开(公告)号:US4508574A

    公开(公告)日:1985-04-02

    申请号:US545241

    申请日:1983-10-25

    摘要: A process for improving the fluidity and conveyability properties of moist calcium sulfate precipitates, having a free water content of more than about 5% by weight, which entails mixing quicklime (CaO), burnt dolomite (CaO+MgO) or a mixture thereof, in finely ground form to said moist calcium sulfate precipitate in an amount of about 10% by weight or greater, based upon the calcium sulfate content, to form a homogeneous mixture of the same.The homogenized mixtures so prepared have good pourability and can be conveniently stored or conveyed. They can be used as setting retarders in cement or, they can be used in the production of gypsum wall board and plaster.

    摘要翻译: 一种改善湿度硫酸钙沉淀物的流动性和输送性能的方法,其具有大于约5重量%的游离水含量,其需要将生石灰(CaO),烧白云石(CaO + MgO)或其混合物混合在一起 基于硫酸钙含量,以约10重量%或更高的量将所述湿硫酸钙沉淀物精细研磨形成其均匀混合物。 如此制备的均质混合物具有良好的倾倒性,并且可以方便地储存或输送。 它们可用作水泥中的缓凝剂,也可用于生产石膏墙板和石膏。