分解工艺

Decomposition process.

先将白钨矿、黑钨矿各自磨细后分别进行碱压煮分解，固液比1:1.1~2.7，压煮温度140~200℃，压力0.3~1.1Mpa，时间为1~6小时。白钨矿碱分解，NaOH的加入量为理论量的2.7~3.7倍，控制初始碱度为500~600g/l，分解完成后稀释过滤时加入理论量2~15%的含P043-添加剂，控制碱度为150~200g/l，温度为70~80℃，过滤后的钨酸钠溶液不进行钨-碱分离，直接用于黑钨矿碱分解，控制初始碱度130~200g/l，加入理论量0.8~1.2倍的含PO43-添加剂。

First scheelite, wolframite their ground and were alkali autoclave decomposition, solid-liquid ratio 1:1.1~2.7, pressure cooking temperature 140-200 DEG C, the pressure 0.3~1.1Mpa time for 1 to 6 hours. Decomposition of scheelite alkali, NaOH dosage 2.7~3.7 theory, the amount of times the control initial alkalinity 500~600g/l. After the completion of the decomposition dilution filtration join% of theoretical amount of PO43 - additives, including controlling the alkalinity 150~200g/l, temperature is 70 ~ 80 DEG C, sodium tungstate solution after filtration in tungsten - alkali separation and direct for wolframite alkali decomposition, control the initial alkalinity 130~200g/l adding PO43 - additive containing theoretical amount to 1.2 times.

分解率达99%左右，可利用冶炼厂现有的通用压煮设备同时处理黑钨精矿、白钨精矿、黑白钨混合矿、钨中矿和回收废钨渣。与酸法工艺比，污染程度大为降低；与其它碱法工艺比，省去钨-碱分离，减少了能耗及钨、碱的损耗，综合碱耗仅为理论量1.35倍左右。

The decomposition rate reached 99%, the smelter existing general purpose pressure cooking equipment and processing wolframite concentrate, white tungsten concentrate, black and white tungsten mixed ore, tungsten middling and recovery waste residue of tungsten. Compared with the acid method, the pollution degree is greatly reduced, and the process is compared with other alkali method, the separation of tungsten and alkali is omitted, the energy consumption and the loss of tungsten and alkali are reduced, and the comprehensive alkali consumption is only about 1.35 times of the theoretical amount.