公开(公告)号：WO2020233558A1

公开(公告)日：2020-11-26

申请号：PCT/CN2020/090982

申请日：2020-05-19

Applicant: SOLVAY SA

Inventor： WOOD, Michael ,  WANG, Yan ,  BEDEL, Sabrina ,  CRIADO, Claude ,  WANG, Aiping

IPC: C01D5/16

Abstract: Provided is a process for purifying a sodium sulfate residue comprising sodium sulfate, sodium carbonate and sodium chloride, and optionally insoluble matter. The process comprises: (a) dissolving the residue with a first aqueous solution to obtain a first aqueous suspension comprising at least 5 wt% and at most 32 wt% of sodium sulfate; (b) optionally separating the insoluble matter from the first aqueous suspension to obtain a separated insoluble matter and a second aqueous solution; (c1) acidifying the second aqueous solution with sulfuric acid to a pH of less than 6 so as to transform at least part or all of dissolved sodium carbonate to sodium sulfate; (c2) optionally aerating the acidified second aqueous solution with oxygen or air to convert sulfites to sulfates; (c3) alkalinizing the acidified second aqueous solution to a pH of about 7 or more with an alkali; (d) removing part of the water from the second aqueous solution to obtain a mother liquor and to crystallize sodium sulfate; (f) purging part of the mother liquor and recycling part of the non-purged mother liquor in at least one of the steps (a) to (d), wherein a weight ratio of the purged separated mother liquor to the non-purged separated mother liquor is at most 0.20 t/t. Also provided is a use of sodium sulfate particles obtained from the process.

公开(公告)号：WO2010089414A1

公开(公告)日：2010-08-12

申请号：PCT/EP2010/051601

申请日：2010-02-09

Applicant: SOLVAY SA ,  COUSTRY, Francis ,  DAVOINE, Perrine ,  CRIADO, Claude ,  CHAU, Thoi-Dai

Inventor： COUSTRY, Francis ,  DAVOINE, Perrine ,  CRIADO, Claude ,  CHAU, Thoi-Dai

IPC: C01B31/20 ,  C01D7/35 ,  B01J6/00 ,  F26B11/04 ,  C01D7/12

CPC classification number: C01D7/35 ,  C01B32/50 ,  C01D7/123

Abstract: Process for producing a gas from a mineral ore, and in particular from trona ore, said gas having a carbon dioxide concentration of more than 25 volume percents expressed on dry gas, and a quantity of volatile organic compounds of less than 700 mg per kilogram of generated carbon dioxide. The process comprises the steps of crushing the trona ore, introducing crushed trona in a rotary calcining drum with indirect heating, calcining the crushed trona in the calcining device, collecting the calcined trona from calcining device and collecting the gas generated by the trona ore calcination from calcining device in order to constitute the produced gas.

Abstract translation: 特别是从天然碱矿石生产气体的方法，所述气体的二氧化碳浓度大于25体积％，表示在干燥气体上，并且一定量的挥发性有机化合物的每千克 产生二氧化碳。 该方法包括以下步骤：将天然碱粉碎，间接加热在旋转煅烧鼓中引入压碎的天然碱，在焙烧装置中煅烧破碎的天然碱，从煅烧装置收集煅烧的天然碱，并收集由天然碱矿石煅烧产生的气体 煅烧装置，以构成产生的气体。