钼精矿焙烧工艺

经过浮选得到的【钼精矿】及【焙烧】前的钼精矿都存在着【干燥问题】。特别是经过浮选的钼精矿，虽然经过了一定的过滤、压滤，其水分含量仍然很高。为便于运输及下道工序的加工，必须经过干燥，使其达到规定的含水率。钼精矿的干燥方法及使用的设备种类很多，干燥效果各不一样。

目前，江西铜业公司德兴铜矿采用了一套由【辽宁东大粉体工程技术有限公司】开发研制的一套【斯德干燥机】，对钼精矿进行干燥，取得了较好的干燥效果，该套装置在国内为首次应用，现在已充分显示出了它的优越性能，产量大，能耗低，含水率可调。德兴铜矿所生产的钼精矿是铜矿副产钼精矿，生产过程工艺条件具有一定的特殊性。所选的钼精矿内含有较多的Na、Ca等杂质成份。这些有害成份，对高温干燥过程亦有一定的影响。因此，在采用斯德干燥过程中充分注意到了这一点。利用间接换热热风炉所得到的洁净热空气去干燥钼精矿，避免增加干燥后钼精矿的含杂量。控制热风温度、流量、流速，使进入斯德干燥机内的热空气与钼精矿充分搅拌、混合。

钼精矿在斯德干燥机内呈高度分散状态存在于热空气流体中，由于钼精矿与热空气能够充分的混合，且悬浮于斯德干燥机内，因此干燥过程快而充分。该混合流体经除尘器，钼精矿被收集，含湿废气经风机排空，全过程可控。

现应用企业名录：栾川钼业集团

                        上海云翔矿业有限公司（上海云翔泰国公司）

                        朝阳金达钼业集团

                        江西铜业德兴矿

                         近20家国内外企业。

 欢迎致电：张继宇  ，13904004886

Preface

At the present time most of the corporations use both reflect kilnout heating rolling kiln in China. And most of corporations abroad use multi chambers kilns.

As the development of molybdenum products market, the performance of the calcinerend gas controlling effect the corporation’ benefit.

The inner heating equipments designedmanufactured by our Co. used in molybdenum dryingcalciningthe end gas controlling is more advanced than traditional ones in technology.

Process schemethe system configuration

 The system consists of the main parts of moly drying, inner heating rolling kiln system, collecting system,mixing air system of direct heating furnace of burning coal.

 The processes are as follows:

Put the moly concentrate powder into the dryer to dryto average particle,then the dried powder be fed to the bunker by conveyor, then to the kiln. Being the source of heating air the direct heating furnace supports hot air to rolling kiln to calcining the molybdenum.          

The gas of sulfur dioxide generated during the production is treated by temperature adjuster, cyclone collector, bag collector,static dust catcher. The air treated is let out. The treatment method of sulfur dioxide can be sodium sulfitelimestone. The first one cost higherthe other one is simplemuch cheaper.

The main technology is in:

1. Using direct inner heating rolling kiln to calcine can make the life of the equipment much longerheighten the thermal efficiency much.

2. The system equipped with dryer can reduce the acid materials out. As the materials being average therefore the calcining is full.

3. The system uses two collecting system the rate of collection is high.

4. The system is in the tiny negative pressure operation there is no dust out. The rate of collection is heightened.

 Data of the system technologyperformance

The detail is as follows:

1. Capacity : One system produces moly oxide 7～8 ton / h.

2. sulfur content in moly oxide is ≤0.07%

3. One ton moly oxide production cost standard coal about 350 KG.

4. One ton moly oxide production cost electricity 280kwh.

5. Rate of collection of the dust ≥99.5%

6. The energy for the system is about 120 kw.

The details the system configuration

The details is as follows:

                               List of equipment

Design time 15 work days          

Manufacture time 80 ～100 days

1. Design feetraining fee RMB 126,400.00 should prepay in one time in one week.

Seller supply:

1 seller sets the engineers to the plant to direct installation, train operator, adjusttest equipments

2 seller supplies groundwork draws, process draws, pipeline connecting drawscontrolling draws.

3directing installing time are 30 workdays, adjusting times are 7 workdays 

2. Buyer supplies the traveling expenses, foodaccommodation.

3. Buyer supplies cablewire from controlling board to the machines.

4. touch-up painting is led by buyer.

5. The materials that the part touches the materials being dried are made from carbon steel.  

 The materials that the part touches the materials being calcining are made from refractories. The conveyor is made from carbon steel.

6. Buyer supply the pipes for draft fan

7. Some parts of equipment should be welded at the locale, buyer pays for it.

8. Platform, bracket, guardrail should be made at the locale, buyer pay for it ,seller supplies the draws of them. 

Remarks

Every production line is made a single system according to the buyer. The workshop would be designed for two production lines. The area for part of calcining is 24×50×10 M², for end gas treading is 24×50×10 M².

The processes will be adjusted if need.