Composite sodium salt for producing sodium stannate from cassiterite concentrate and application of composite sodium salt
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A technology of sodium stannate and concentrate, applied in the field of sodium salt, can solve the problems of large environmental pollution, high cost, unsafe operation, etc., and achieve the effects of low price, easy availability and wide sources
Active Publication Date: 2013-02-13
CENT SOUTH UNIV
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Problems solved by technology
[0008] In order to solve the problems of high cost, unsafe operation, large environmental pollution, and high requirements on equipment materials in the traditional preparation process of sodium stannate, and realize the purpose of directly and efficiently preparing sodium stannate from cassiterite concentrate, the present invention is proposed
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Embodiment 1
[0025] The mass percent of each component in the compound sodium salt is: 70% sodium carbonate, 20% sodium bicarbonate, 5% sodium borate, and 5% sodium humate. When in use, first mix the cassiterite concentrate and the composite sodium salt in a mass ratio of 1:0.5, then pelletize, dry, use coke powder as the reducing agent, roast at 950°C, and roast for 30 minutes; the roasted product is ground , leaching, filtering, purification and impurity removal, concentrated crystallization, etc., to obtain sodium stannate products. The conversion rate of Sn was 75.2%.
Embodiment 2
[0027] The mass percent of each component in the compound sodium salt is: sodium carbonate 75%, sodium bicarbonate 17%, sodium borate 4%, sodium humate 4%. When in use, first mix the cassiterite concentrate and the composite sodium salt evenly at a mass ratio of 1:0.9, pelletize, dry, use coke powder as the reducing agent, roast at 910°C, and roast for 45 minutes; the roasted product is ground, Sodium stannate products are obtained by leaching, filtering, purifying and removing impurities, concentrating and crystallizing, etc. The conversion rate of Sn was 78.9%.
Embodiment 3
[0029] The mass percent of each component in the compound sodium salt is: 80% sodium carbonate, 14% sodium bicarbonate, 3% sodium borate, and 3% sodium humate. When in use, first mix the cassiterite concentrate and the composite sodium salt in a mass ratio of 1:1.3, then pelletize, dry, and use coke powder as the reducing agent at a roasting temperature of 875°C and a roasting time of 60 minutes; the roasted product is ground , leaching, filtering, purification and impurity removal, concentrated crystallization, etc., to obtain sodium stannate products. The conversion rate of Sn was 86.9%.
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Abstract
The invention discloses a composite sodium salt for producing sodium stannate from cassiterite concentrate and an application of the composite sodium salt. The composite sodium salt consists of 70%-90% of sodium carbonate, 5%-20% of sodium bicarbonate, 2.5%-5% of sodium borate and 2.5%-5% of sodium humate by mass. When the composite sodium salt is used, the composite sodium salt is ground to the particles with the size fraction of minus 0.1mm being no less than 90% by mass, the cassiterite concentrate of the fine fraction and the composite sodium salt are mixed according to the mass ratio of 1:(0.5-2), pelletized and dried, coke powder or anthracite is taken as a reducing agent, the mixture is calcined for 30 minutes-90minutes at the temperature of 800 DEG C-950 DEG C, and the cooled calcined product is ground, leached, filtered, purified, concentrated and crystallized, so that the sodium stannate product is obtained. The adopted composite sodium salt is reasonable in component, can be widely obtained, is low in price, is easy to obtain and does not cause pollution to the environment. With the composite sodium salt, the stable crystal structure of the cassiterite concentrate can be obviously damaged, and the composite sodium salt can be widely applied to various cassiterite concentrates so as to directly produce sodium stannate.
Description
technical field [0001] The invention relates to a sodium stannate used for preparing sodium stannate, in particular to a composite sodium salt used for directly preparing sodium stannate from cassiterite concentrate, and also relates to the application of the composite sodium salt. Background technique [0002] Sodium stannate is one of the earliest tin chemical products, and its main use is for alkaline tin plating and its alloys in the electroplating industry (for example: tin-zinc, tin-cadmium, tin-copper and tin-aluminum alloy, etc. ); In addition, it is also used as a fire retardant and a weighting agent in the textile industry. It can be used as a mordant in the dye industry, and can also be used as an additive in glass, ceramics and other industries. [0003] In the traditional process of preparing sodium stannate, refined tin is usually used as raw material. Such as the alkali analysis method, mainly use refined tin as raw material to prepare shaving tin, then use s...
Claims
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Application Information
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