Technology for producing tungsten trioxide by prilling and roasting of tungsten slag

Abstract

The invention discloses a technology for producing tungsten trioxide by prilling and roasting of tungsten slag. The technology is characterized by comprising the following steps of: (1) baking tungsten slag and then adding blind coal, mixing and crushing the tungsten slag and the blind coal, and then adding lime mud, sodium carbonate and water, priling in a priling disc to prepare the mixed tungsten slag balls; (2) putting the mixed tungsten slag balls into an open hearth kiln to carry out semi-enclosed insulated roasting so as to obtain a tungsten slag clinker; (3) soaking the tungsten slag clinker, and carrying out ion exchange to obtain high-concentration sodium tungstate mother liquor; (4) removing the impurity of the high-concentration sodium tungstate mother liquor, and then filtering, precipitating, leaching the sediment, dewatering and baking the sediment to obtain a calcium tungstate product. The tungsten slag, the blind coal, the lime mud and recycling wastewater are adopted as roasting agents to replace soda ash and burning acid with high price and large consumption for the traditional technology-wet firing method, so that the tungsten production cost of each metal ton is reduced by***, and the transformation rate of WO3 is improved by 25%; the chronic diseases of sodium-process rotary kiln roasting and caking shovel kiln stop production are successfully solved, and about 50% of energy consumption is saved on the traditional technology and wet firing production.

Description

technical field [0001] The invention relates to a process for comprehensive recovery and utilization of tungsten slag resources. Background technique [0002] Tungsten slag is the waste slag produced by tungsten smelting enterprises in the production process of pressure leaching. The pressure leaching process is to use the standard fine tungsten ore with a content of 65% obtained after the tungsten ore is processed through ore dressing as raw material, add additives, and undergo wet decomposition or pyrolysis under high temperature and high pressure alkaline conditions to obtain sodium tungstate, tungsten Calcium acid, ammonium paratungstate and other tungsten primary products and waste slag with a fineness of more than 100 meshes, that is, tungsten slag, each output of one ton of WO 3 Primary products, about 0.8 tons are discharged at the same time (residual WO 3 1.5-6% tungsten slag; if low-grade tungsten concentrate is used, the amount of tungsten slag discharged will i...

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Problems solved by technology

Since the tungsten slag changes its original physical structure or the chemical form of certain components during the smelting process, it is difficult to recycle the tungsten slag by beneficiation. At present, the comprehensive utilization of tungsten slag in China generally adopts the traditional wet method, The WO content in the tungsten slag is recovered below 3% by pyrotechnic or wet pyrotechnic combination 3 At that time, there were problems such as high energy consumption, large amount of auxiliary materials, high cost, and basically no economic benefits. Therefore, the comprehensive utilization rate of tungsten slag was not high, and a large amount of tungsten slag was piled up naturally for many years, which not only caused It caused serious environmental pollution and harm, and also caused waste and loss of a large amount of valuable metal resources, resulting in a loss of about 30 billion yuan.

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