I’m having issues with my gear pump and would like to choose a different model; I hope experts can help me

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Initially, a Wicken gear pump of model HL4724 was used for the high-waste tar pump in this installation; it is of the internal meshing type, and large springs are used for the mechanical seals. The properties of the medium are as follows: 1. It contains tiny particles, whose size is too small to be seen visually, but these particles can be felt when the material is squeezed between the fingers. 2. Viscosity calculated during design: 0.52 mPa·s ； At room temperature of 20°C, it has good flowability with no significant resistance to stirring; it solidifies below 0°C. 3. The actual flow rate is 200–400 kg/h, and the actual head is 20–30 m (the burner operates at 18 M; there is a pressure of 0.2–1.2 barg before the fuel enters the burner). Problems that occurred during use: 1. The rotor seized; it seized right from the start of use, with severe wear on the rotor components, and there were scratches on the external gear teeth. 2. Sealing leakage: The new pump leaks right from the start of use. It seems the pump selection was inappropriate; I’d like to choose a different one. Are there any suitable pump types? Does anyone have experience using pumps with similar media? I’m seeking recommendations.