Safe use method of industrial by-product based titanium-gypsum in cadmium-lead-arsenic contaminated farmland

• Main Authors: QIU DONGSHENG, CHEN MIN, LIANG YONGCHAO, MEI YUCHAO, DAI YUXIA, TANG XIANJIN, ZHAO WENLIANG
• Format: Patent
• Language: Chinese; English
• Published: 04.02.2020
• Subjects: ADHESIVES; AGRICULTURE; ANIMAL HUSBANDRY; CHEMISTRY; DISPOSAL OF SOLID WASTE; DYES; FISHING; FORESTRY; HUMAN NECESSITIES; HUNTING; MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; PAINTS; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES ORIMPLEMENTS, IN GENERAL; PERFORMING OPERATIONS; POLISHES; RECLAMATION OF CONTAMINATED SOIL; RECLAMATION OF CONTAMINED SOIL SOIL; SOIL WORKING IN AGRICULTURE OR FORESTRY; TRANSPORTING; TRAPPING

The invention discloses a safe use method of industrial by-product based titanium-gypsum in a cadmium-lead-arsenic contaminated farmland. The method saves time and labor, and the industrial by-productbased titanium-gypsum can be applied together with a farmland basic fertilizer, and in addition is low in cost, wide in material source and applicable to large-scale popularization in cadmium-lead-arsenic composite contaminated farmlands. The use method specifically comprises the following steps: before rice sowing or transplanting, adding titanium-gypsum leached by a citric acid solution to soilof a cadmium-lead-arsenic contaminated paddy field, and sufficiently and uniformly mixing the titanium-gypsum with topsoil of the paddy field. Impurity contents such as cadmium, arsenic and lead in titanium-gypsum after leaching are remarkably reduced when being compared with those of cadmium, arsenic and lead in titanium-gypsum before leaching. The method is simple and feasible, low in cost andconvenient to popularize. 本