Production and resource utilization of flue gas desulfurized gypsum …
Flue gas desulfurized gypsum (FGD gypsum), mainly originates from thermal power plants, smelters, and large-scale enterprise boilers.This article reviews the production in China and the latest beneficial utilizations of FGD gypsum. China is a large coal-consuming country and has always had serious SO 2 emissions. Therefore, the Chinese government has …
Determination of trace elements in dolomite and gypsum by …
These data are presented in Table 4. 3.7. Determination trace elements in dolomite and gypsum The developed method was applied to determine the concentrations of Ag, Cd, Cr, Mn, Tl and Zn present as impurities in dolomite and gypsum. After flotation under optimized conditions, Mn and Zn were determined by FAAS, and Ag, Cd, Cr and Tl by ETAAS.
Preparation of gypsum with high purity and whiteness from …
Phosphogypsum (PG) is a solid waste product generated during wet-process phosphoric acid production. Various impurities considerably reduce the purity, whiteness, and application range of PG. This ...
Application of waste gypsum as novel selective depressant …
Gypsum is the predominant component of gypsum slag, accounting for more than 80 % of the total composition; therefore, gypsum slag has potential as an inorganic depressant in phosphate ore flotation. Desulfurized gypsum, phosphogypsum, titanium gypsum, and gypsum citrate are major types of gypsum waste with substantial reserves that require ...
Desilication and purification of phosphogypsum waste by flotation …
The flow rate of air was 10 cm 3 /s. The initial height of the s was used to evaluate the ing properties of PASF when the solution produced the s. 2.9. ... After reverse flotation, the content of gypsum in PG increased from 89.16 % to 93.32 %, the quartz decreased from 4.87 % to 2.12 % and the whiteness of PG increased from 25.62 % ...
The interaction of clay minerals with gypsum and its
For the flotation experiments air flow rate, impeller speed, flotation time and other flotation reagents were kept constant, and the flotation outcomes were explained by the rheology behavior of ...
Flotation separation of scheelite from gypsum using Pb …
The flotation recovery of gypsum was higher than that of scheelite, and the difference in flotation recovery between scheelite and gypsum decreased as the DDA dosage increased. At DDA dosages exceeding 17 mg/L, the flotation recovery of scheelite was greater than that of gypsum. Using SDS as the collector, scheelite's flotation recovery ...
Flow diagram for phosphogypsum purification process.
Via the closed-circuit flotation process, the whiteness of the PG concentrate is improved from 33.23 to 63.42, and the purity of gypsum in the PG concentrate increases from 83.90% to 96.70%, with ...
The study on the effect of flotation purification on the …
Phosphogypsum (PG) is a massive industrial solid waste. In this paper, PG was purified by flotation method, and α-hemihydrate gypsum (α-HH) was prepared by the …
Impact of gypsum supersaturated solution on surface properties …
Deng et al. [8] reported that he-terocoagulation observed in gypsum-saturated water flotation of zinc sulfide minerals occurred between silica and sphalerite rather than between the precipitated ...
The interaction of clay minerals with gypsum and its …
From these flotation results it can be inferred that the presence of bentonite reduced true flotation, but the presence of gypsum caused bentonite to behave more like kaolinite. Kaolinite increased the recovery by entrainment as a result of the creation of a more stable froth which is supported by the high mass–water recovery curve (Fig. 1).
Interaction Mechanism between Molybdenite and Kaolinite in Gypsum
This paper aims to understand the fundamental interaction mechanism between molybdenite and kaolinite in gypsum solution using kerosene as collector. Micro-flotation tests were conducted to study the effect of gypsum solution on the flotation performance of mixed −74 μm molybdenite and −10 μm kaolinite mineral. The results showed that the recovery of …
Research advances in phosphogypsum flotation purification: …
Wang et al. [25] used pine oil and 1231 for flotation and obtained gypsum concentrate with a grade of 96.6%, a whiteness of 58.2%, and a recovery of 74.1% after a closed-circuit flotation with the ... The tube flow mineralization is connected with the cyclone separation along the tangential direction, forming the circulating separation ...
Properties, Purification, and Applications of Phosphogypsum: …
The flotation closed-circuit experiment improved the whiteness of PG from 31.5 to 58.4 and decreased the amount of total P 2 O 5 in gypsum by 50%. The grade of calcium sulphate dihydrate was 96.6%, and the concentration …
Flow chart of grinding test before desliming.
Via the closed-circuit flotation process, the whiteness of the PG concentrate is improved from 33.23 to 63.42, and the purity of gypsum in the PG concentrate increases from 83.90% to 96.70%, with ...
A novel method for purification of phosphogypsum
A large amount of organic matter and fine slime in the phosphogypsum were removed by reverse flotation, and gypsum was floated by positive flotation. Through the flotation closed-circuit experiment, the whiteness of phosphogypsum was increased from 31.5 to 58.4, the percentage of total phosphorus in gypsum (P2O5) was reduced from 1.78 to 0.89 ...
Flow chart of frother screening test. | Download Scientific …
Via the closed-circuit flotation process, the whiteness of the PG concentrate is improved from 33.23 to 63.42, and the purity of gypsum in the PG concentrate increases from 83.90% to 96.70%, with ...
Utilisation of FGD gypsum for silicate removal from scheelite flotation
The residual silicate in recycled water poses a significant threat to the environment and scheelite flotation performance. FGD gypsum was collected from a steel plant located in Panzhihua, China. ... was performed on the removal efficiency of silicate and economic evaluation of the operation for utilisation of FGD gypsum. A continuous flow mode ...
Method for separating calcium carbonate and gypsum
A method for separating a suspension containing gypsum granules and calcium carbonate granules and an aqueous solution, wherein the aqueous solution comprises at least one sodium salt, wherein the aqueous solution has a sodium ion concentration of at least 3 g/L and wherein such method comprises a step of separation by flotation using a collector for the gypsum …
Flow chart of dodecylamine dosage test.
Via the closed-circuit flotation process, the whiteness of the PG concentrate is improved from 33.23 to 63.42, and the purity of gypsum in the PG concentrate increases from 83.90% to 96.70%, with ...
X-ray diffraction spectrum of pure molybdenite.
The poor molybdenite flotation behavior in high-calcium water is mainly caused by the fact that Ca 2+ ions can inhibit the adsorption effect of hydrocarbon oils on the molybdenite surface.
(PDF) The study on the effect of flotation purification on the
In this paper, PG was purified by flotation method, and α‑hemihydrate gypsum (α‑HH) was prepared by the autoclaving method. The morphology of α‑HH was adjusted by adding …
The role of impurities and additives in the crystallisation of gypsum
The rate of growth of the pure gypsum in the crystalliser at 25°C was 0.0389 kg/ m2 hour while those in the pipe flow system were between 0.0289 and 0.0202 kg/m2 hour, depending on the pipe ...
Impact of gypsum on flotation of scheelite and fluorite …
Impact of gypsum on flotation of scheelite and fluorite using sodium oleate as collector Zhiguo Zhanga,b, Yijun Caob,c, Zilong Mab, and Yinfei Liaob aSchool of Chemical Engineering and Technology ...
Flotation separation of scheelite from gypsum using Pb …
The exploration of recovering and exploiting tungsten from gypsum slag through flotation has thus emerged as a significant topic in the comprehensive utilization of tungsten resources. Consequently, this study investigates the flotation behaviors and action mechanisms of gypsum and scheelite using Pb-BHA complex collectors.
(PDF) Production of epsom, gypsum and other industrial …
The process was examined at different influent flow rate ranging from 4-12 mL-min -1 for phosphate concentration of 110 mg-L -1 . The effect of influent flow rate was investigated by measuring the conversion from liquid to solid phase. As the flow rate is increased from 4-12 mL-min -1, the rate of phosphate removal also increases.
Simple and efficient method for purification and recovery of …
The gypsum concentrate with a whiteness of 69.2 % and calcium sulphate dihydrate purity of 97.24 % was obtained via a simple and efficient method of "high-speed stirring …
(PDF) The study on the effect of flotation purification on the
In this paper, PG was purified by flotation method, and α-hemihydrate gypsum (α-HH) was prepared by the autoclaving method. The morphology of α-HH was adjusted by …
The study on the effect of flotation purification on the …
gypsum was signicantly increased, the purity reached 96.5%, and the soluble phosphorus and ˚uorine content ... Flotation experiment. ˜e otation test rst weighed 200 g of PG raw ore for ball ...
The interaction of clay minerals with gypsum and its …
Six flotation tests were conducted using the copper–gold ore and its mixtures with quartz, clay minerals and gypsum. Fig. 1 shows the mass recovery as a function of water recovery from these tests. As can be seen, flotation of the ore or baseline resulted in a 5% mass recovery and 31% water recovery at the completion of flotation.